Export of internal Abseil changes.
--
78293ba4eb4981991ae7e6edd25eb9245fcd7515 by Andy Soffer <asoffer@google.com>:
internal changes
PiperOrigin-RevId: 247073879
--
7bd97e3aad0c3012b89a39392a6ad3f254e9f3c3 by Derek Mauro <dmauro@google.com>:
Release commandline flags
PiperOrigin-RevId: 247065920
--
2a991849fd7b140a43b073076d194b61533fd199 by Tom Manshreck <shreck@google.com>:
Add documentation for built-in usage flags
PiperOrigin-RevId: 247058863
--
14157b0de45841706bbd631284191fd94c313db9 by Derek Mauro <dmauro@google.com>:
Internal change
PiperOrigin-RevId: 247058292
--
ed67e0a80468596e30540b367727a250fa415b68 by Abseil Team <absl-team@google.com>:
Internal Change.
PiperOrigin-RevId: 246828655
--
e1bc8c2aa3f90b3d56c55c5b7244e718c919265d by Abseil Team <absl-team@google.com>:
Internal change
PiperOrigin-RevId: 246822325
--
907a68f287199f749cb9bdb48571b50bc34731e1 by Eric Fiselier <ericwf@google.com>:
Accept vector<bool>::reference in StrCat and friends.
Converting vector<bool>::reference to alphanum requires
two user defined conversions, which isn't allowed.
In order to accept this, we need a special constructor that
is only enabled for the bool proxy types.
PiperOrigin-RevId: 246626732
--
fe4295fa95cc65dee8c881ba12dd8f516e68c40d by Abseil Team <absl-team@google.com>:
Clarify the proper way to define AbslHashValue, and fix confusing indentation.
PiperOrigin-RevId: 246406528
--
d7174681a72d4a25c8fd2b4d9f515a0763eff87c by Gennadiy Rozental <rogeeff@google.com>:
Internal change
PiperOrigin-RevId: 246358214
--
a7fdc19683cf1a5885e9e1af52fcdb2db1eda53b by Abseil Team <absl-team@google.com>:
Fix sample template instantiation.
PiperOrigin-RevId: 246354617
--
29a23c6835f872948d09b24d890385bf195bc995 by Abseil Team <absl-team@google.com>:
Fix incorrectly copy-pasted static_assert in absl::optional::value_or
The static_assert for a move-constructible type previously said the type must be copy-constructible.
PiperOrigin-RevId: 246313827
--
41884d5872d4ea2c67875b00144b8c8a5859a295 by Greg Falcon <gfalcon@google.com>:
Import of CCTZ from GitHub.
PiperOrigin-RevId: 245418790
--
7f90a7f94cdd5e21232c749efe952a750b5c43a2 by Abseil Team <absl-team@google.com>:
Internal change
PiperOrigin-RevId: 245412658
--
730a329cf047d54b46971fce1781edd857208c2a by Greg Falcon <gfalcon@google.com>:
internal change
PiperOrigin-RevId: 245293234
--
cf0216be6338200cbb18167d3f3b2e98e372be77 by Greg Falcon <gfalcon@google.com>:
Internal change
PiperOrigin-RevId: 245288164
GitOrigin-RevId: 78293ba4eb4981991ae7e6edd25eb9245fcd7515
Change-Id: I5ea9a852c36c722bae2d6be65fb7f72473d94ab6
diff --git a/absl/CMakeLists.txt b/absl/CMakeLists.txt
index bba0f3e..bd13eef 100644
--- a/absl/CMakeLists.txt
+++ b/absl/CMakeLists.txt
@@ -20,6 +20,7 @@
add_subdirectory(algorithm)
add_subdirectory(container)
add_subdirectory(debugging)
+add_subdirectory(flags)
add_subdirectory(hash)
add_subdirectory(memory)
add_subdirectory(meta)
diff --git a/absl/container/internal/raw_hash_set.h b/absl/container/internal/raw_hash_set.h
index 8ac0dda..02030bd 100644
--- a/absl/container/internal/raw_hash_set.h
+++ b/absl/container/internal/raw_hash_set.h
@@ -969,7 +969,7 @@
// This overload kicks in when the argument is an rvalue of init_type. Its
// purpose is to handle brace-init-list arguments.
//
- // flat_hash_set<std::string, int> s;
+ // flat_hash_map<std::string, int> s;
// s.insert({"abc", 42});
std::pair<iterator, bool> insert(init_type&& value) {
return emplace(std::move(value));
diff --git a/absl/copts/GENERATED_AbseilCopts.cmake b/absl/copts/GENERATED_AbseilCopts.cmake
index 27e6f5a..f968ba7 100644
--- a/absl/copts/GENERATED_AbseilCopts.cmake
+++ b/absl/copts/GENERATED_AbseilCopts.cmake
@@ -201,6 +201,7 @@
"/wd4180"
"/wd4244"
"/wd4267"
+ "/wd4503"
"/wd4800"
)
diff --git a/absl/copts/GENERATED_copts.bzl b/absl/copts/GENERATED_copts.bzl
index 0feb0f4..2b4790a 100644
--- a/absl/copts/GENERATED_copts.bzl
+++ b/absl/copts/GENERATED_copts.bzl
@@ -202,6 +202,7 @@
"/wd4180",
"/wd4244",
"/wd4267",
+ "/wd4503",
"/wd4800",
]
diff --git a/absl/copts/copts.py b/absl/copts/copts.py
index 154c0ce..8a0ecf6 100644
--- a/absl/copts/copts.py
+++ b/absl/copts/copts.py
@@ -163,8 +163,8 @@
"ABSL_LLVM_TEST_FLAGS":
LLVM_TEST_DISABLE_WARNINGS_FLAGS,
"ABSL_LLVM_EXCEPTIONS_FLAGS": ["-fexceptions"],
- "ABSL_CLANG_CL_FLAGS": (
- MSVC_BIG_WARNING_FLAGS + LLVM_DISABLE_WARNINGS_FLAGS + MSVC_DEFINES),
+ "ABSL_CLANG_CL_FLAGS":
+ (MSVC_BIG_WARNING_FLAGS + LLVM_DISABLE_WARNINGS_FLAGS + MSVC_DEFINES),
"ABSL_CLANG_CL_TEST_FLAGS":
LLVM_TEST_DISABLE_WARNINGS_FLAGS,
"ABSL_CLANG_CL_EXCEPTIONS_FLAGS":
@@ -179,6 +179,8 @@
"/wd4244",
# conversion from 'size_t' to 'type', possible loss of data
"/wd4267",
+ # The decorated name was longer than the compiler limit
+ "/wd4503",
# forcing value to bool 'true' or 'false' (performance warning)
"/wd4800",
],
diff --git a/absl/copts/generate_copts.py b/absl/copts/generate_copts.py
index 28b677e..0e5dc9f 100755
--- a/absl/copts/generate_copts.py
+++ b/absl/copts/generate_copts.py
@@ -70,8 +70,9 @@
return "GENERATED_copts.bzl"
-# Copt file generation
def copt_list(name, arg_list, style):
+ """Copt file generation."""
+
make_line = lambda s: " \"" + s + "\"" + style.separator()
external_str_list = [make_line(s) for s in arg_list]
diff --git a/absl/flags/BUILD.bazel b/absl/flags/BUILD.bazel
new file mode 100644
index 0000000..2d868b0
--- /dev/null
+++ b/absl/flags/BUILD.bazel
@@ -0,0 +1,351 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+load(
+ "//absl:copts/configure_copts.bzl",
+ "ABSL_DEFAULT_COPTS",
+ "ABSL_DEFAULT_LINKOPTS",
+ "ABSL_TEST_COPTS",
+)
+
+package(default_visibility = ["//visibility:public"])
+
+licenses(["notice"]) # Apache 2.0
+
+cc_library(
+ name = "internal",
+ srcs = [
+ "internal/program_name.cc",
+ ],
+ hdrs = [
+ "internal/path_util.h",
+ "internal/program_name.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/flags:__pkg__",
+ ],
+ deps = [
+ "//absl/strings",
+ "//absl/synchronization",
+ ],
+)
+
+cc_library(
+ name = "config",
+ srcs = [
+ "usage_config.cc",
+ ],
+ hdrs = [
+ "config.h",
+ "usage_config.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":internal",
+ "//absl/base:core_headers",
+ "//absl/strings",
+ "//absl/synchronization",
+ ],
+)
+
+cc_library(
+ name = "marshalling",
+ srcs = [
+ "marshalling.cc",
+ ],
+ hdrs = [
+ "marshalling.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ "//absl/base:core_headers",
+ "//absl/strings",
+ "//absl/strings:str_format",
+ ],
+)
+
+cc_library(
+ name = "handle",
+ srcs = [
+ "internal/commandlineflag.cc",
+ ],
+ hdrs = [
+ "internal/commandlineflag.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/flags:__pkg__",
+ ],
+ deps = [
+ ":config",
+ ":marshalling",
+ "//absl/base",
+ "//absl/base:core_headers",
+ "//absl/strings",
+ "//absl/synchronization",
+ "//absl/types:optional",
+ ],
+)
+
+cc_library(
+ name = "registry",
+ srcs = [
+ "internal/registry.cc",
+ "internal/type_erased.cc",
+ ],
+ hdrs = [
+ "internal/registry.h",
+ "internal/type_erased.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/flags:__pkg__",
+ ],
+ deps = [
+ ":config",
+ ":handle",
+ "//absl/base",
+ "//absl/base:core_headers",
+ "//absl/base:dynamic_annotations",
+ "//absl/strings",
+ "//absl/synchronization",
+ ],
+)
+
+cc_library(
+ name = "flag",
+ srcs = [
+ "flag.cc",
+ ],
+ hdrs = [
+ "declare.h",
+ "flag.h",
+ "internal/flag.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":handle",
+ ":marshalling",
+ ":registry",
+ "//absl/base",
+ "//absl/base:core_headers",
+ "//absl/strings",
+ ],
+)
+
+cc_library(
+ name = "usage",
+ srcs = [
+ "internal/usage.cc",
+ ],
+ hdrs = [
+ "internal/usage.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ visibility = [
+ "//absl/flags:__pkg__",
+ ],
+ deps = [
+ ":config",
+ ":flag",
+ ":handle",
+ ":internal",
+ "//absl/strings",
+ "//absl/synchronization",
+ ],
+)
+
+cc_library(
+ name = "parse",
+ srcs = ["parse.cc"],
+ hdrs = [
+ "internal/parse.h",
+ "parse.h",
+ ],
+ copts = ABSL_DEFAULT_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":flag",
+ ":handle",
+ ":internal",
+ ":registry",
+ ":usage",
+ "//absl/strings",
+ "//absl/synchronization",
+ ],
+)
+
+############################################################################
+# Unit tests in alpahabetical order.
+
+cc_test(
+ name = "commandlineflag_test",
+ size = "small",
+ srcs = [
+ "internal/commandlineflag_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":flag",
+ ":handle",
+ ":registry",
+ "//absl/memory",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "flag_test",
+ size = "small",
+ srcs = [
+ "flag_test.cc",
+ "flag_test_defs.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":flag",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "marshalling_test",
+ size = "small",
+ srcs = [
+ "marshalling_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":marshalling",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "path_util_test",
+ size = "small",
+ srcs = [
+ "internal/path_util_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":internal",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "parse_test",
+ size = "small",
+ srcs = [
+ "parse_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":flag",
+ ":parse",
+ "//absl/base",
+ "//absl/base:scoped_set_env",
+ "//absl/strings",
+ "//absl/types:span",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "program_name_test",
+ size = "small",
+ srcs = [
+ "internal/program_name_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":internal",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "type_erased_test",
+ size = "small",
+ srcs = [
+ "internal/type_erased_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":flag",
+ ":registry",
+ "//absl/memory",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "usage_config_test",
+ size = "small",
+ srcs = [
+ "usage_config_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":internal",
+ "//absl/strings",
+ "@com_google_googletest//:gtest_main",
+ ],
+)
+
+cc_test(
+ name = "usage_test",
+ size = "small",
+ srcs = [
+ "internal/usage_test.cc",
+ ],
+ copts = ABSL_TEST_COPTS,
+ linkopts = ABSL_DEFAULT_LINKOPTS,
+ deps = [
+ ":config",
+ ":flag",
+ ":internal",
+ ":parse",
+ ":usage",
+ "//absl/memory",
+ "//absl/strings",
+ "@com_google_googletest//:gtest",
+ ],
+)
diff --git a/absl/flags/CMakeLists.txt b/absl/flags/CMakeLists.txt
new file mode 100644
index 0000000..284d627
--- /dev/null
+++ b/absl/flags/CMakeLists.txt
@@ -0,0 +1,317 @@
+#
+# Copyright 2019 The Abseil Authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+# https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ flags_internal
+ SRCS
+ "internal/program_name.cc"
+ HDRS
+ "internal/path_util.h"
+ "internal/program_name.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::strings
+ absl::synchronization
+ PUBLIC
+)
+
+absl_cc_library(
+ NAME
+ flags_config
+ SRCS
+ "usage_config.cc"
+ HDRS
+ "config.h"
+ "usage_config.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::flags_internal
+ absl::core_headers
+ absl::strings
+ absl::synchronization
+)
+
+absl_cc_library(
+ NAME
+ flags_marshalling
+ SRCS
+ "marshalling.cc"
+ HDRS
+ "marshalling.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::core_headers
+ absl::strings
+ absl::str_format
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ flags_handle
+ SRCS
+ "internal/commandlineflag.cc"
+ HDRS
+ "internal/commandlineflag.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::flags_config
+ absl::flags_marshalling
+ absl::base
+ absl::core_headers
+ absl::strings
+ absl::synchronization
+ absl::optional
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ flags_registry
+ SRCS
+ "internal/registry.cc"
+ "internal/type_erased.cc"
+ HDRS
+ "internal/registry.h"
+ "internal/type_erased.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::flags_config
+ absl::flags_handle
+ absl::base
+ absl::core_headers
+ absl::dynamic_annotations
+ absl::strings
+ absl::synchronization
+)
+
+absl_cc_library(
+ NAME
+ flags
+ SRCS
+ "flag.cc"
+ HDRS
+ "declare.h"
+ "flag.h"
+ "internal/flag.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::flags_config
+ absl::flags_handle
+ absl::flags_marshalling
+ absl::flags_registry
+ absl::base
+ absl::core_headers
+ absl::strings
+)
+
+# Internal-only target, do not depend on directly.
+absl_cc_library(
+ NAME
+ flags_usage
+ SRCS
+ "internal/usage.cc"
+ HDRS
+ "internal/usage.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::flags_config
+ absl::flags
+ absl::flags_handle
+ absl::flags_internal
+ absl::strings
+ absl::synchronization
+)
+
+absl_cc_library(
+ NAME
+ flags_parse
+ SRCS
+ "parse.cc"
+ HDRS
+ "internal/parse.h"
+ "parse.h"
+ COPTS
+ ${ABSL_DEFAULT_COPTS}
+ LINKOPTS
+ ${ABSL_DEFAULT_LINKOPTS}
+ DEPS
+ absl::flags_config
+ absl::flags
+ absl::flags_handle
+ absl::flags_internal
+ absl::flags_registry
+ absl::flags_usage
+ absl::strings
+ absl::synchronization
+)
+
+############################################################################
+# Unit tests in alpahabetical order.
+
+absl_cc_test(
+ NAME
+ flags_commandlineflag_test
+ SRCS
+ "internal/commandlineflag_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags
+ absl::flags_handle
+ absl::flags_registry
+ absl::memory
+ absl::strings
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_flag_test
+ SRCS
+ "flag_test.cc"
+ "flag_test_defs.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags
+ absl::strings
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_marshalling_test
+ SRCS
+ "marshalling_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_marshalling
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_parse_test
+ SRCS
+ "parse_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags
+ absl::base
+ absl::flags_parse
+ absl::scoped_set_env
+ absl::span
+ absl::strings
+ gmock_main
+)
+
+absl_cc_test(
+ NAME
+ flags_path_util_test
+ SRCS
+ "internal/path_util_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_internal
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_program_name_test
+ SRCS
+ "internal/program_name_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_internal
+ absl::strings
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_type_erased_test
+ SRCS
+ "internal/type_erased_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags
+ absl::flags_registry
+ absl::memory
+ absl::strings
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_usage_config_test
+ SRCS
+ "usage_config_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_config
+ absl::flags_internal
+ absl::strings
+ gtest_main
+)
+
+absl_cc_test(
+ NAME
+ flags_usage_test
+ SRCS
+ "internal/usage_test.cc"
+ COPTS
+ ${ABSL_TEST_COPTS}
+ DEPS
+ absl::flags_config
+ absl::flags
+ absl::flags_internal
+ absl::flags_parse
+ absl::flags_usage
+ absl::memory
+ absl::strings
+ gtest
+)
diff --git a/absl/flags/config.h b/absl/flags/config.h
new file mode 100644
index 0000000..a734af4
--- /dev/null
+++ b/absl/flags/config.h
@@ -0,0 +1,54 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_CONFIG_H_
+#define ABSL_FLAGS_CONFIG_H_
+
+// Determine if we should strip string literals from the Flag objects.
+#if !defined(ABSL_FLAGS_STRIP_NAMES)
+
+// Non-mobile linux platforms don't strip string literals.
+#if (defined(__linux__) || defined(__Fuchsia__)) && !defined(__ANDROID__)
+#define ABSL_FLAGS_STRIP_NAMES 0
+
+// So do Macs (not iOS or embedded Apple platforms).
+#elif defined(__APPLE__)
+#include <TargetConditionals.h>
+#if !TARGET_OS_IPHONE && !TARGET_OS_EMBEDDED
+#define ABSL_FLAGS_STRIP_NAMES 0
+#endif
+
+// And Windows.
+#elif defined(_WIN32)
+#define ABSL_FLAGS_STRIP_NAMES 0
+
+// And Myriad.
+#elif defined(__myriad2__)
+#define ABSL_FLAGS_STRIP_NAMES 0
+
+#endif
+#endif // !defined(ABSL_FLAGS_STRIP_NAMES)
+
+#if ABSL_FLAGS_STRIP_NAMES
+#if !defined(ABSL_FLAGS_STRIP_HELP)
+#define ABSL_FLAGS_STRIP_HELP 1
+#endif
+#else
+#if !defined(ABSL_FLAGS_STRIP_HELP)
+#define ABSL_FLAGS_STRIP_HELP 0
+#endif
+#endif
+
+#endif // ABSL_FLAGS_CONFIG_H_
diff --git a/absl/flags/declare.h b/absl/flags/declare.h
new file mode 100644
index 0000000..556ec5e
--- /dev/null
+++ b/absl/flags/declare.h
@@ -0,0 +1,58 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: declare.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the ABSL_DECLARE_FLAG macro, allowing you to declare an
+// `absl::Flag` for use within a translation unit. You should place this
+// declaration within the header file associated with the .cc file that defines
+// and owns the `Flag`.
+
+#ifndef ABSL_FLAGS_DECLARE_H_
+#define ABSL_FLAGS_DECLARE_H_
+
+#include "absl/strings/string_view.h"
+
+namespace absl {
+namespace flags_internal {
+
+// absl::Flag<T> represents a flag of type 'T' created by ABSL_FLAG.
+template <typename T>
+class Flag;
+
+} // namespace flags_internal
+
+// Flag
+//
+// Forward declaration of the `absl::Flag` type for use in defining the macro.
+template <typename T>
+using Flag = flags_internal::Flag<T>;
+
+} // namespace absl
+
+// ABSL_DECLARE_FLAG()
+//
+// This macro is a convenience for declaring use of an `absl::Flag` within a
+// translation unit. This macro should be used within a header file to
+// declare usage of the flag within any .cc file including that header file.
+//
+// The ABSL_DECLARE_FLAG(type, name) macro expands to:
+//
+// extern absl::Flag<type> FLAGS_name;
+#define ABSL_DECLARE_FLAG(type, name) extern ::absl::Flag<type> FLAGS_##name
+
+#endif // ABSL_FLAGS_DECLARE_H_
diff --git a/absl/flags/flag.cc b/absl/flags/flag.cc
new file mode 100644
index 0000000..ba002ed
--- /dev/null
+++ b/absl/flags/flag.cc
@@ -0,0 +1,52 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/flag.h"
+
+#include <cstring>
+
+namespace absl {
+
+// We want to validate the type mismatch between type definition and
+// declaration. The lock-free implementation does not allow us to do it,
+// so in debug builds we always use the slower implementation, which always
+// validates the type.
+#ifndef NDEBUG
+#define ABSL_FLAGS_ATOMIC_GET(T) \
+ T GetFlag(const absl::Flag<T>& flag) { \
+ T result; \
+ flag.internal.Read(&result, &flags_internal::FlagOps<T>); \
+ return result; \
+ }
+#else
+#define ABSL_FLAGS_ATOMIC_GET(T) \
+ T GetFlag(const absl::Flag<T>& flag) { \
+ const int64_t r = flag.internal.atomic.load(std::memory_order_acquire); \
+ if (r != flags_internal::CommandLineFlag::kAtomicInit) { \
+ T t; \
+ memcpy(&t, &r, sizeof(T)); \
+ return t; \
+ } \
+ T result; \
+ flag.internal.Read(&result, &flags_internal::FlagOps<T>); \
+ return result; \
+ }
+#endif
+
+ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(ABSL_FLAGS_ATOMIC_GET)
+
+#undef ABSL_FLAGS_ATOMIC_GET
+
+} // namespace absl
diff --git a/absl/flags/flag.h b/absl/flags/flag.h
new file mode 100644
index 0000000..2cbbb45
--- /dev/null
+++ b/absl/flags/flag.h
@@ -0,0 +1,281 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: flag.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the `absl::Flag<T>` type for holding command-line
+// flag data, and abstractions to create, get and set such flag data.
+//
+// It is important to note that this type is **unspecified** (an implementation
+// detail) and you do not construct or manipulate actual `absl::Flag<T>`
+// instances. Instead, you define and declare flags using the
+// `ABSL_FLAG()` and `ABSL_DECLARE_FLAG()` macros, and get and set flag values
+// using the `absl::GetFlag()` and `absl::SetFlag()` functions.
+
+#ifndef ABSL_FLAGS_FLAG_H_
+#define ABSL_FLAGS_FLAG_H_
+
+#include "absl/base/attributes.h"
+#include "absl/base/casts.h"
+#include "absl/flags/config.h"
+#include "absl/flags/declare.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/flags/internal/flag.h"
+#include "absl/flags/marshalling.h"
+
+namespace absl {
+
+// Flag
+//
+// An `absl::Flag` holds a command-line flag value, providing a runtime
+// parameter to a binary. Such flags should be defined in the global namespace
+// and (preferably) in the module containing the binary's `main()` function.
+//
+// You should not construct and cannot use the `absl::Flag` type directly;
+// instead, you should declare flags using the `ABSL_DECLARE_FLAG()` macro
+// within a header file, and define your flag using `ABSL_FLAG()` within your
+// header's associated `.cc` file. Such flags will be named `FLAGS_name`.
+//
+// Example:
+//
+// .h file
+//
+// // Declares usage of a flag named "FLAGS_count"
+// ABSL_DECLARE_FLAG(int, count);
+//
+// .cc file
+//
+// // Defines a flag named "FLAGS_count" with a default `int` value of 0.
+// ABSL_FLAG(int, count, 0, "Count of items to process");
+//
+// No public methods of `absl::Flag<T>` are part of the Abseil Flags API.
+template <typename T>
+using Flag = flags_internal::Flag<T>;
+
+// GetFlag()
+//
+// Returns the value (of type `T`) of an `absl::Flag<T>` instance, by value. Do
+// not construct an `absl::Flag<T>` directly and call `absl::GetFlag()`;
+// instead, refer to flag's constructed variable name (e.g. `FLAGS_name`).
+// Because this function returns by value and not by reference, it is
+// thread-safe, but note that the operation may be expensive; as a result, avoid
+// `absl::GetFlag()` within any tight loops.
+//
+// Example:
+//
+// // FLAGS_count is a Flag of type `int`
+// int my_count = absl::GetFlag(FLAGS_count);
+//
+// // FLAGS_firstname is a Flag of type `std::string`
+// std::string first_name = absl::GetFlag(FLAGS_firstname);
+template <typename T>
+T GetFlag(const absl::Flag<T>& flag) {
+#define ABSL_FLAGS_INTERNAL_LOCK_FREE_VALIDATE(BIT) \
+ static_assert( \
+ !std::is_same<T, BIT>::value, \
+ "Do not specify explicit template parameters to absl::GetFlag");
+ ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(ABSL_FLAGS_INTERNAL_LOCK_FREE_VALIDATE)
+#undef ABSL_FLAGS_INTERNAL_LOCK_FREE_VALIDATE
+
+ // Implementation notes:
+ //
+ // We are wrapping a union around the value of `T` to serve three purposes:
+ //
+ // 1. `U.value` has correct size and alignment for a value of type `T`
+ // 2. The `U.value` constructor is not invoked since U's constructor does not
+ // do it explicitly.
+ // 3. The `U.value` destructor is invoked since U's destructor does it
+ // explicitly. This makes `U` a kind of RAII wrapper around non default
+ // constructible value of T, which is destructed when we leave the scope.
+ // We do need to destroy U.value, which is constructed by
+ // CommandLineFlag::Read even though we left it in a moved-from state
+ // after std::move.
+ //
+ // All of this serves to avoid requiring `T` being default constructible.
+ union U {
+ T value;
+ U() {}
+ ~U() { value.~T(); }
+ };
+ U u;
+
+ flag.internal.Read(&u.value, &flags_internal::FlagOps<T>);
+ return std::move(u.value);
+}
+
+// Overload for `GetFlag()` for types that support lock-free reads.
+#define ABSL_FLAGS_INTERNAL_LOCK_FREE_EXPORT(T) \
+ extern T GetFlag(const absl::Flag<T>& flag);
+ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(ABSL_FLAGS_INTERNAL_LOCK_FREE_EXPORT)
+#undef ABSL_FLAGS_INTERNAL_LOCK_FREE_EXPORT
+
+// SetFlag()
+//
+// Sets the value of an `absl::Flag` to the value `v`. Do not construct an
+// `absl::Flag<T>` directly and call `absl::SetFlag()`; instead, use the
+// flag's variable name (e.g. `FLAGS_name`). This function is
+// thread-safe, but is potentially expensive. Avoid setting flags in general,
+// but especially within performance-critical code.
+template <typename T>
+void SetFlag(absl::Flag<T>* flag, const T& v) {
+ flag->internal.Write(&v, &flags_internal::FlagOps<T>);
+}
+
+// Overload of `SetFlag()` to allow callers to pass in a value that is
+// convertible to `T`. E.g., use this overload to pass a "const char*" when `T`
+// is `std::string`.
+template <typename T, typename V>
+void SetFlag(absl::Flag<T>* flag, const V& v) {
+ T value(v);
+ SetFlag<T>(flag, value);
+}
+
+} // namespace absl
+
+
+// ABSL_FLAG()
+//
+// This macro defines an `absl::Flag<T>` instance of a specified type `T`:
+//
+// ABSL_FLAG(T, name, default_value, help);
+//
+// where:
+//
+// * `T` is a supported flag type (See below),
+// * `name` designates the name of the flag (as a global variable
+// `FLAGS_name`),
+// * `default_value` is an expression holding the default value for this flag
+// (which must be implicitly convertible to `T`),
+// * `help` is the help text, which can also be an expression.
+//
+// This macro expands to a flag named 'FLAGS_name' of type 'T':
+//
+// absl::Flag<T> FLAGS_name = ...;
+//
+// Note that all such instances are created as global variables.
+//
+// For `ABSL_FLAG()` values that you wish to expose to other translation units,
+// it is recommended to define those flags within the `.cc` file associated with
+// the header where the flag is declared.
+//
+// Note: do not construct objects of type `absl::Flag<T>` directly. Only use the
+// `ABSL_FLAG()` macro for such construction.
+#define ABSL_FLAG(Type, name, default_value, help) \
+ ABSL_FLAG_IMPL(Type, name, default_value, help)
+
+// ABSL_FLAG().OnUpdate()
+//
+// Defines a flag of type `T` with a callback attached:
+//
+// ABSL_FLAG(T, name, default_value, help).OnUpdate(callback);
+//
+// After any setting of the flag value, the callback will be called at least
+// once. A rapid sequence of changes may be merged together into the same
+// callback. No concurrent calls to the callback will be made for the same
+// flag. Callbacks are allowed to read the current value of the flag but must
+// not mutate that flag.
+//
+// The update mechanism guarantees "eventual consistency"; if the callback
+// derives an auxiliary data structure from the flag value, it is guaranteed
+// that eventually the flag value and the derived data structure will be
+// consistent.
+//
+// Note: ABSL_FLAG.OnUpdate() does not have a public definition. Hence, this
+// comment serves as its API documentation.
+
+
+// -----------------------------------------------------------------------------
+// Implementation details below this section
+// -----------------------------------------------------------------------------
+
+// ABSL_FLAG_IMPL macro definition conditional on ABSL_FLAGS_STRIP_NAMES
+
+#if ABSL_FLAGS_STRIP_NAMES
+#define ABSL_FLAG_IMPL_FLAGNAME(txt) ""
+#define ABSL_FLAG_IMPL_FILENAME() ""
+#define ABSL_FLAG_IMPL_REGISTRAR(T, flag) \
+ absl::flags_internal::FlagRegistrar<T, false>(&flag)
+#else
+#define ABSL_FLAG_IMPL_FLAGNAME(txt) txt
+#define ABSL_FLAG_IMPL_FILENAME() __FILE__
+#define ABSL_FLAG_IMPL_REGISTRAR(T, flag) \
+ absl::flags_internal::FlagRegistrar<T, true>(&flag)
+#endif
+
+// ABSL_FLAG_IMPL macro definition conditional on ABSL_FLAGS_STRIP_HELP
+
+#if ABSL_FLAGS_STRIP_HELP
+#define ABSL_FLAG_IMPL_FLAGHELP(txt) absl::flags_internal::kStrippedFlagHelp
+#else
+#define ABSL_FLAG_IMPL_FLAGHELP(txt) txt
+#endif
+
+#define ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, txt) \
+ static std::string AbslFlagsWrapHelp##name() { \
+ return ABSL_FLAG_IMPL_FLAGHELP(txt); \
+ }
+
+#define ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value) \
+ static void* AbslFlagsInitFlag##name() { \
+ return absl::flags_internal::MakeFromDefaultValue<Type>(default_value); \
+ }
+
+// ABSL_FLAG_IMPL
+//
+// Note: Name of registrar object is not arbitrary. It is used to "grab"
+// global name for FLAGS_no<flag_name> symbol, thus preventing the possibility
+// of defining two flags with names foo and nofoo.
+#define ABSL_FLAG_IMPL(Type, name, default_value, help) \
+ namespace absl {} \
+ ABSL_FLAG_IMPL_DECLARE_DEF_VAL_WRAPPER(name, Type, default_value) \
+ ABSL_FLAG_IMPL_DECLARE_HELP_WRAPPER(name, help) \
+ absl::Flag<Type> FLAGS_##name( \
+ ABSL_FLAG_IMPL_FLAGNAME(#name), \
+ &AbslFlagsWrapHelp##name, \
+ ABSL_FLAG_IMPL_FILENAME(), \
+ &absl::flags_internal::FlagMarshallingOps<Type>, \
+ &AbslFlagsInitFlag##name); \
+ extern bool FLAGS_no##name; \
+ bool FLAGS_no##name = ABSL_FLAG_IMPL_REGISTRAR(Type, FLAGS_##name)
+
+// ABSL_RETIRED_FLAG
+//
+// Designates the flag (which is usually pre-existing) as "retired." A retired
+// flag is a flag that is now unused by the program, but may still be passed on
+// the command line, usually by production scripts. A retired flag is ignored
+// and code can't access it at runtime.
+//
+// This macro registers a retired flag with given name and type, with a name
+// identical to the name of the original flag you are retiring. The retired
+// flag's type can change over time, so that you can retire code to support a
+// custom flag type.
+//
+// This macro has the same signature as `ABSL_FLAG`. To retire a flag, simply
+// replace an `ABSL_FLAG` definition with `ABSL_RETIRED_FLAG`, leaving the
+// arguments unchanged (unless of course you actually want to retire the flag
+// type at this time as well).
+//
+// `default_value` is only used as a double check on the type. `explanation` is
+// unused.
+// TODO(rogeeff): Return an anonymous struct instead of bool, and place it into
+// the unnamed namespace.
+#define ABSL_RETIRED_FLAG(type, flagname, default_value, explanation) \
+ ABSL_ATTRIBUTE_UNUSED static const bool ignored_##flagname = \
+ ([] { return type(default_value); }, \
+ absl::flags_internal::RetiredFlag<type>(#flagname))
+
+#endif // ABSL_FLAGS_FLAG_H_
diff --git a/absl/flags/flag_test.cc b/absl/flags/flag_test.cc
new file mode 100644
index 0000000..1bcd7e9
--- /dev/null
+++ b/absl/flags/flag_test.cc
@@ -0,0 +1,482 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/flag.h"
+
+#include "gtest/gtest.h"
+#include "absl/strings/match.h"
+#include "absl/strings/numbers.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
+
+ABSL_DECLARE_FLAG(int64_t, mistyped_int_flag);
+ABSL_DECLARE_FLAG(std::vector<std::string>, mistyped_string_flag);
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+std::string TestHelpMsg() { return "help"; }
+template <typename T>
+void* TestMakeDflt() {
+ return new T{};
+}
+void TestCallback() {}
+
+template <typename T>
+bool TestConstructionFor() {
+ constexpr flags::Flag<T> f1("f1", &TestHelpMsg, "file",
+ &absl::flags_internal::FlagMarshallingOps<T>,
+ &TestMakeDflt<T>);
+ EXPECT_EQ(f1.Name(), "f1");
+ EXPECT_EQ(f1.Help(), "help");
+ EXPECT_EQ(f1.Filename(), "file");
+
+ ABSL_CONST_INIT static flags::Flag<T> f2(
+ "f2", &TestHelpMsg, "file", &absl::flags_internal::FlagMarshallingOps<T>,
+ &TestMakeDflt<T>);
+ flags::FlagRegistrar<T, false>(&f2).OnUpdate(TestCallback);
+
+ EXPECT_EQ(f2.Name(), "f2");
+ EXPECT_EQ(f2.Help(), "help");
+ EXPECT_EQ(f2.Filename(), "file");
+
+ return true;
+}
+
+struct UDT {
+ UDT() = default;
+ UDT(const UDT&) = default;
+};
+bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
+std::string AbslUnparseFlag(const UDT&) { return ""; }
+
+TEST(FlagTest, TestConstruction) {
+ TestConstructionFor<bool>();
+ TestConstructionFor<int16_t>();
+ TestConstructionFor<uint16_t>();
+ TestConstructionFor<int32_t>();
+ TestConstructionFor<uint32_t>();
+ TestConstructionFor<int64_t>();
+ TestConstructionFor<uint64_t>();
+ TestConstructionFor<double>();
+ TestConstructionFor<float>();
+ TestConstructionFor<std::string>();
+
+ TestConstructionFor<UDT>();
+}
+
+// --------------------------------------------------------------------
+
+} // namespace
+
+ABSL_DECLARE_FLAG(bool, test_flag_01);
+ABSL_DECLARE_FLAG(int, test_flag_02);
+ABSL_DECLARE_FLAG(int16_t, test_flag_03);
+ABSL_DECLARE_FLAG(uint16_t, test_flag_04);
+ABSL_DECLARE_FLAG(int32_t, test_flag_05);
+ABSL_DECLARE_FLAG(uint32_t, test_flag_06);
+ABSL_DECLARE_FLAG(int64_t, test_flag_07);
+ABSL_DECLARE_FLAG(uint64_t, test_flag_08);
+ABSL_DECLARE_FLAG(double, test_flag_09);
+ABSL_DECLARE_FLAG(float, test_flag_10);
+ABSL_DECLARE_FLAG(std::string, test_flag_11);
+
+namespace {
+
+#if !ABSL_FLAGS_STRIP_NAMES
+
+TEST(FlagTest, TestFlagDeclaration) {
+ // test that we can access flag objects.
+ EXPECT_EQ(FLAGS_test_flag_01.Name(), "test_flag_01");
+ EXPECT_EQ(FLAGS_test_flag_02.Name(), "test_flag_02");
+ EXPECT_EQ(FLAGS_test_flag_03.Name(), "test_flag_03");
+ EXPECT_EQ(FLAGS_test_flag_04.Name(), "test_flag_04");
+ EXPECT_EQ(FLAGS_test_flag_05.Name(), "test_flag_05");
+ EXPECT_EQ(FLAGS_test_flag_06.Name(), "test_flag_06");
+ EXPECT_EQ(FLAGS_test_flag_07.Name(), "test_flag_07");
+ EXPECT_EQ(FLAGS_test_flag_08.Name(), "test_flag_08");
+ EXPECT_EQ(FLAGS_test_flag_09.Name(), "test_flag_09");
+ EXPECT_EQ(FLAGS_test_flag_10.Name(), "test_flag_10");
+ EXPECT_EQ(FLAGS_test_flag_11.Name(), "test_flag_11");
+}
+#endif // !ABSL_FLAGS_STRIP_NAMES
+
+// --------------------------------------------------------------------
+
+} // namespace
+
+ABSL_FLAG(bool, test_flag_01, true, "test flag 01");
+ABSL_FLAG(int, test_flag_02, 1234, "test flag 02");
+ABSL_FLAG(int16_t, test_flag_03, -34, "test flag 03");
+ABSL_FLAG(uint16_t, test_flag_04, 189, "test flag 04");
+ABSL_FLAG(int32_t, test_flag_05, 10765, "test flag 05");
+ABSL_FLAG(uint32_t, test_flag_06, 40000, "test flag 06");
+ABSL_FLAG(int64_t, test_flag_07, -1234567, "test flag 07");
+ABSL_FLAG(uint64_t, test_flag_08, 9876543, "test flag 08");
+ABSL_FLAG(double, test_flag_09, -9.876e-50, "test flag 09");
+ABSL_FLAG(float, test_flag_10, 1.234e12f, "test flag 10");
+ABSL_FLAG(std::string, test_flag_11, "", "test flag 11");
+
+namespace {
+
+#if !ABSL_FLAGS_STRIP_NAMES
+TEST(FlagTest, TestFlagDefinition) {
+ absl::string_view expected_file_name = "absl/flags/flag_test.cc";
+
+ EXPECT_EQ(FLAGS_test_flag_01.Name(), "test_flag_01");
+ EXPECT_EQ(FLAGS_test_flag_01.Help(), "test flag 01");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_01.Filename(), expected_file_name));
+
+ EXPECT_EQ(FLAGS_test_flag_02.Name(), "test_flag_02");
+ EXPECT_EQ(FLAGS_test_flag_02.Help(), "test flag 02");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_02.Filename(), expected_file_name));
+
+ EXPECT_EQ(FLAGS_test_flag_03.Name(), "test_flag_03");
+ EXPECT_EQ(FLAGS_test_flag_03.Help(), "test flag 03");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_03.Filename(), expected_file_name));
+
+ EXPECT_EQ(FLAGS_test_flag_04.Name(), "test_flag_04");
+ EXPECT_EQ(FLAGS_test_flag_04.Help(), "test flag 04");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_04.Filename(), expected_file_name));
+
+ EXPECT_EQ(FLAGS_test_flag_05.Name(), "test_flag_05");
+ EXPECT_EQ(FLAGS_test_flag_05.Help(), "test flag 05");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_05.Filename(), expected_file_name));
+
+ EXPECT_EQ(FLAGS_test_flag_06.Name(), "test_flag_06");
+ EXPECT_EQ(FLAGS_test_flag_06.Help(), "test flag 06");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_06.Filename(), expected_file_name));
+
+ EXPECT_EQ(FLAGS_test_flag_07.Name(), "test_flag_07");
+ EXPECT_EQ(FLAGS_test_flag_07.Help(), "test flag 07");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_07.Filename(), expected_file_name));
+
+ EXPECT_EQ(FLAGS_test_flag_08.Name(), "test_flag_08");
+ EXPECT_EQ(FLAGS_test_flag_08.Help(), "test flag 08");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_08.Filename(), expected_file_name));
+
+ EXPECT_EQ(FLAGS_test_flag_09.Name(), "test_flag_09");
+ EXPECT_EQ(FLAGS_test_flag_09.Help(), "test flag 09");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_09.Filename(), expected_file_name));
+
+ EXPECT_EQ(FLAGS_test_flag_10.Name(), "test_flag_10");
+ EXPECT_EQ(FLAGS_test_flag_10.Help(), "test flag 10");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_10.Filename(), expected_file_name));
+
+ EXPECT_EQ(FLAGS_test_flag_11.Name(), "test_flag_11");
+ EXPECT_EQ(FLAGS_test_flag_11.Help(), "test flag 11");
+ EXPECT_TRUE(
+ absl::EndsWith(FLAGS_test_flag_11.Filename(), expected_file_name));
+}
+#endif // !ABSL_FLAGS_STRIP_NAMES
+
+// --------------------------------------------------------------------
+
+TEST(FlagTest, TestDefault) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), true);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 1234);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), -34);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 189);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), 10765);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 40000);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -1234567);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 9876543);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), -9.876e-50, 1e-55);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), 1.234e12f, 1e5f);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "");
+}
+
+// --------------------------------------------------------------------
+
+TEST(FlagTest, TestGetSet) {
+ absl::SetFlag(&FLAGS_test_flag_01, false);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_01), false);
+
+ absl::SetFlag(&FLAGS_test_flag_02, 321);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_02), 321);
+
+ absl::SetFlag(&FLAGS_test_flag_03, 67);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_03), 67);
+
+ absl::SetFlag(&FLAGS_test_flag_04, 1);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_04), 1);
+
+ absl::SetFlag(&FLAGS_test_flag_05, -908);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_05), -908);
+
+ absl::SetFlag(&FLAGS_test_flag_06, 4001);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_06), 4001);
+
+ absl::SetFlag(&FLAGS_test_flag_07, -23456);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_07), -23456);
+
+ absl::SetFlag(&FLAGS_test_flag_08, 975310);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_08), 975310);
+
+ absl::SetFlag(&FLAGS_test_flag_09, 1.00001);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_09), 1.00001, 1e-10);
+
+ absl::SetFlag(&FLAGS_test_flag_10, -3.54f);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_test_flag_10), -3.54f, 1e-6f);
+
+ absl::SetFlag(&FLAGS_test_flag_11, "asdf");
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_11), "asdf");
+}
+
+// --------------------------------------------------------------------
+
+int GetDflt1() { return 1; }
+
+} // namespace
+
+ABSL_FLAG(int, test_flag_12, GetDflt1(), "test flag 12");
+ABSL_FLAG(std::string, test_flag_13, absl::StrCat("AAA", "BBB"),
+ "test flag 13");
+
+namespace {
+
+TEST(FlagTest, TestNonConstexprDefault) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_12), 1);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_13), "AAABBB");
+}
+
+// --------------------------------------------------------------------
+
+} // namespace
+
+ABSL_FLAG(bool, test_flag_14, true, absl::StrCat("test ", "flag ", "14"));
+
+namespace {
+
+#if !ABSL_FLAGS_STRIP_HELP
+TEST(FlagTest, TestNonConstexprHelp) {
+ EXPECT_EQ(FLAGS_test_flag_14.Help(), "test flag 14");
+}
+#endif //! ABSL_FLAGS_STRIP_HELP
+
+// --------------------------------------------------------------------
+
+int cb_test_value = -1;
+void TestFlagCB();
+
+} // namespace
+
+ABSL_FLAG(int, test_flag_with_cb, 100, "").OnUpdate(TestFlagCB);
+
+ABSL_FLAG(int, test_flag_with_lambda_cb, 200, "").OnUpdate([]() {
+ cb_test_value = absl::GetFlag(FLAGS_test_flag_with_lambda_cb) +
+ absl::GetFlag(FLAGS_test_flag_with_cb);
+});
+
+namespace {
+
+void TestFlagCB() { cb_test_value = absl::GetFlag(FLAGS_test_flag_with_cb); }
+
+// Tests side-effects of callback invocation.
+TEST(FlagTest, CallbackInvocation) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_with_cb), 100);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_with_lambda_cb), 200);
+ EXPECT_EQ(cb_test_value, 300);
+
+ absl::SetFlag(&FLAGS_test_flag_with_cb, 1);
+ EXPECT_EQ(cb_test_value, 1);
+
+ absl::SetFlag(&FLAGS_test_flag_with_lambda_cb, 3);
+ EXPECT_EQ(cb_test_value, 4);
+}
+
+// --------------------------------------------------------------------
+
+struct CustomUDT {
+ CustomUDT() : a(1), b(1) {}
+ CustomUDT(int a_, int b_) : a(a_), b(b_) {}
+
+ friend bool operator==(const CustomUDT& f1, const CustomUDT& f2) {
+ return f1.a == f2.a && f1.b == f2.b;
+ }
+
+ int a;
+ int b;
+};
+bool AbslParseFlag(absl::string_view in, CustomUDT* f, std::string*) {
+ std::vector<absl::string_view> parts =
+ absl::StrSplit(in, ':', absl::SkipWhitespace());
+
+ if (parts.size() != 2) return false;
+
+ if (!absl::SimpleAtoi(parts[0], &f->a)) return false;
+
+ if (!absl::SimpleAtoi(parts[1], &f->b)) return false;
+
+ return true;
+}
+std::string AbslUnparseFlag(const CustomUDT& f) {
+ return absl::StrCat(f.a, ":", f.b);
+}
+
+} // namespace
+
+ABSL_FLAG(CustomUDT, test_flag_15, CustomUDT(), "test flag 15");
+
+namespace {
+
+TEST(FlagTest, TestCustomUDT) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_15), CustomUDT(1, 1));
+ absl::SetFlag(&FLAGS_test_flag_15, CustomUDT(2, 3));
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_15), CustomUDT(2, 3));
+}
+
+// MSVC produces link error on the type mismatch.
+// Linux does not have build errors and validations work as expected.
+#if 0 // !defined(_WIN32) && GTEST_HAS_DEATH_TEST
+
+TEST(Flagtest, TestTypeMismatchValidations) {
+ // For builtin types, GetFlag() only does validation in debug mode.
+ EXPECT_DEBUG_DEATH(
+ absl::GetFlag(FLAGS_mistyped_int_flag),
+ "Flag 'mistyped_int_flag' is defined as one type and declared "
+ "as another");
+ EXPECT_DEATH(absl::SetFlag(&FLAGS_mistyped_int_flag, 0),
+ "Flag 'mistyped_int_flag' is defined as one type and declared "
+ "as another");
+
+ EXPECT_DEATH(absl::GetFlag(FLAGS_mistyped_string_flag),
+ "Flag 'mistyped_string_flag' is defined as one type and "
+ "declared as another");
+ EXPECT_DEATH(
+ absl::SetFlag(&FLAGS_mistyped_string_flag, std::vector<std::string>{}),
+ "Flag 'mistyped_string_flag' is defined as one type and declared as "
+ "another");
+}
+
+#endif
+
+// --------------------------------------------------------------------
+
+// A contrived type that offers implicit and explicit conversion from specific
+// source types.
+struct ConversionTestVal {
+ ConversionTestVal() = default;
+ explicit ConversionTestVal(int a_in) : a(a_in) {}
+
+ enum class ViaImplicitConv { kTen = 10, kEleven };
+ // NOLINTNEXTLINE
+ ConversionTestVal(ViaImplicitConv from) : a(static_cast<int>(from)) {}
+
+ int a;
+};
+
+bool AbslParseFlag(absl::string_view in, ConversionTestVal* val_out,
+ std::string*) {
+ if (!absl::SimpleAtoi(in, &val_out->a)) {
+ return false;
+ }
+ return true;
+}
+std::string AbslUnparseFlag(const ConversionTestVal& val) {
+ return absl::StrCat(val.a);
+}
+
+} // namespace
+
+// Flag default values can be specified with a value that converts to the flag
+// value type implicitly.
+ABSL_FLAG(ConversionTestVal, test_flag_16,
+ ConversionTestVal::ViaImplicitConv::kTen, "test flag 16");
+
+namespace {
+
+TEST(FlagTest, CanSetViaImplicitConversion) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_16).a, 10);
+ absl::SetFlag(&FLAGS_test_flag_16,
+ ConversionTestVal::ViaImplicitConv::kEleven);
+ EXPECT_EQ(absl::GetFlag(FLAGS_test_flag_16).a, 11);
+}
+
+// --------------------------------------------------------------------
+
+struct NonDfltConstructible {
+ public:
+ // This constructor tests that we can initialize the flag with int value
+ NonDfltConstructible(int i) : value(i) {} // NOLINT
+
+ // This constructor tests that we can't initialize the flag with char value
+ // but can with explicitly constructed NonDfltConstructible.
+ explicit NonDfltConstructible(char c) : value(100 + static_cast<int>(c)) {}
+
+ int value;
+};
+
+bool AbslParseFlag(absl::string_view in, NonDfltConstructible* ndc_out,
+ std::string*) {
+ return absl::SimpleAtoi(in, &ndc_out->value);
+}
+std::string AbslUnparseFlag(const NonDfltConstructible& ndc) {
+ return absl::StrCat(ndc.value);
+}
+
+} // namespace
+
+ABSL_FLAG(NonDfltConstructible, ndc_flag1, NonDfltConstructible('1'),
+ "Flag with non default constructible type");
+ABSL_FLAG(NonDfltConstructible, ndc_flag2, 0,
+ "Flag with non default constructible type");
+
+namespace {
+
+TEST(FlagTest, TestNonDefaultConstructibleType) {
+ EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag1).value, '1' + 100);
+ EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag2).value, 0);
+
+ absl::SetFlag(&FLAGS_ndc_flag1, NonDfltConstructible('A'));
+ absl::SetFlag(&FLAGS_ndc_flag2, 25);
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag1).value, 'A' + 100);
+ EXPECT_EQ(absl::GetFlag(FLAGS_ndc_flag2).value, 25);
+}
+
+// --------------------------------------------------------------------
+
+} // namespace
+
+ABSL_RETIRED_FLAG(bool, old_bool_flag, true, "old descr");
+ABSL_RETIRED_FLAG(int, old_int_flag, (int)std::sqrt(10), "old descr");
+ABSL_RETIRED_FLAG(std::string, old_str_flag, "", absl::StrCat("old ", "descr"));
+
+namespace {
+
+TEST(FlagTest, TestRetiredFlagRegistration) {
+ bool is_bool = false;
+ EXPECT_TRUE(flags::IsRetiredFlag("old_bool_flag", &is_bool));
+ EXPECT_TRUE(is_bool);
+ EXPECT_TRUE(flags::IsRetiredFlag("old_int_flag", &is_bool));
+ EXPECT_FALSE(is_bool);
+ EXPECT_TRUE(flags::IsRetiredFlag("old_str_flag", &is_bool));
+ EXPECT_FALSE(is_bool);
+ EXPECT_FALSE(flags::IsRetiredFlag("some_other_flag", &is_bool));
+}
+
+} // namespace
diff --git a/absl/flags/flag_test_defs.cc b/absl/flags/flag_test_defs.cc
new file mode 100644
index 0000000..3366c58
--- /dev/null
+++ b/absl/flags/flag_test_defs.cc
@@ -0,0 +1,22 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+// This file is used to test the mismatch of the flag type between definition
+// and declaration. These are definitions. flag_test.cc contains declarations.
+#include <string>
+#include "absl/flags/flag.h"
+
+ABSL_FLAG(int, mistyped_int_flag, 0, "");
+ABSL_FLAG(std::string, mistyped_string_flag, "", "");
diff --git a/absl/flags/internal/commandlineflag.cc b/absl/flags/internal/commandlineflag.cc
new file mode 100644
index 0000000..7444472
--- /dev/null
+++ b/absl/flags/internal/commandlineflag.cc
@@ -0,0 +1,383 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/commandlineflag.h"
+
+#include <cassert>
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/optimization.h"
+#include "absl/flags/config.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/str_cat.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+namespace flags_internal {
+
+// The help message indicating that the commandline flag has been
+// 'stripped'. It will not show up when doing "-help" and its
+// variants. The flag is stripped if ABSL_FLAGS_STRIP_HELP is set to 1
+// before including absl/flags/flag.h
+
+// This is used by this file, and also in commandlineflags_reporting.cc
+const char kStrippedFlagHelp[] = "\001\002\003\004 (unknown) \004\003\002\001";
+
+namespace {
+
+void StoreAtomic(CommandLineFlag* flag, const void* data, size_t size) {
+ int64_t t = 0;
+ assert(size <= sizeof(int64_t));
+ memcpy(&t, data, size);
+ flag->atomic.store(t, std::memory_order_release);
+}
+
+// If the flag has a mutation callback this function invokes it. While the
+// callback is being invoked the primary flag's mutex is unlocked and it is
+// re-locked back after call to callback is completed. Callback invocation is
+// guarded by flag's secondary mutex instead which prevents concurrent callback
+// invocation. Note that it is possible for other thread to grab the primary
+// lock and update flag's value at any time during the callback invocation.
+// This is by design. Callback can get a value of the flag if necessary, but it
+// might be different from the value initiated the callback and it also can be
+// different by the time the callback invocation is completed.
+// Requires that *primary_lock be held in exclusive mode; it may be released
+// and reacquired by the implementation.
+void InvokeCallback(CommandLineFlag* flag, absl::Mutex* primary_lock)
+ EXCLUSIVE_LOCKS_REQUIRED(primary_lock) {
+ if (!flag->callback) return;
+
+ // The callback lock is guaranteed initialized, because *primary_lock exists.
+ absl::Mutex* callback_mu = &flag->locks->callback_mu;
+
+ // When executing the callback we need the primary flag's mutex to be unlocked
+ // so that callback can retrieve the flag's value.
+ primary_lock->Unlock();
+
+ {
+ absl::MutexLock lock(callback_mu);
+
+ flag->callback();
+ }
+
+ primary_lock->Lock();
+}
+
+// Currently we only validate flag values for user-defined flag types.
+bool ShouldValidateFlagValue(const CommandLineFlag& flag) {
+#define DONT_VALIDATE(T) \
+ if (flag.IsOfType<T>()) return false;
+ ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(DONT_VALIDATE)
+ DONT_VALIDATE(std::string)
+ DONT_VALIDATE(std::vector<std::string>)
+#undef DONT_VALIDATE
+
+ return true;
+}
+
+} // namespace
+
+// Update any copy of the flag value that is stored in an atomic word.
+// In addition if flag has a mutation callback this function invokes it.
+void UpdateCopy(CommandLineFlag* flag, absl::Mutex* primary_lock)
+ EXCLUSIVE_LOCKS_REQUIRED(primary_lock) {
+#define STORE_ATOMIC(T) \
+ else if (flag->IsOfType<T>()) { \
+ StoreAtomic(flag, flag->cur, sizeof(T)); \
+ }
+
+ if (false) {
+ }
+ ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(STORE_ATOMIC)
+#undef STORE_ATOMIC
+
+ InvokeCallback(flag, primary_lock);
+}
+
+// Ensure that the lazily initialized fields of *flag have been initialized,
+// and return &flag->locks->primary_mu.
+absl::Mutex* InitFlagIfNecessary(CommandLineFlag* flag)
+ LOCK_RETURNED(flag->locks->primary_mu) {
+ absl::Mutex* mu;
+ if (!flag->inited.load(std::memory_order_acquire)) {
+ // Need to initialize lazily initialized fields.
+ ABSL_CONST_INIT static absl::Mutex init_lock(absl::kConstInit);
+ init_lock.Lock();
+ if (flag->locks == nullptr) { // Must initialize Mutexes for this flag.
+ flag->locks = new flags_internal::CommandLineFlagLocks;
+ }
+ mu = &flag->locks->primary_mu;
+ init_lock.Unlock();
+ mu->Lock();
+ if (!flag->retired &&
+ flag->def == nullptr) { // Need to initialize def and cur fields.
+ flag->def = (*flag->make_init_value)();
+ flag->cur = Clone(flag->op, flag->def);
+ UpdateCopy(flag, mu);
+ }
+ mu->Unlock();
+ flag->inited.store(true, std::memory_order_release);
+ } else { // All fields initialized; flag->locks is therefore safe to read.
+ mu = &flag->locks->primary_mu;
+ }
+ return mu;
+}
+
+// Return true iff flag value was changed via direct-access.
+bool ChangedDirectly(CommandLineFlag* flag, const void* a, const void* b) {
+ if (!flag->IsAbseilFlag()) {
+ // Need to compare values for direct-access flags.
+#define CHANGED_FOR_TYPE(T) \
+ if (flag->IsOfType<T>()) { \
+ return *reinterpret_cast<const T*>(a) != *reinterpret_cast<const T*>(b); \
+ }
+
+ CHANGED_FOR_TYPE(bool);
+ CHANGED_FOR_TYPE(int32_t);
+ CHANGED_FOR_TYPE(int64_t);
+ CHANGED_FOR_TYPE(uint64_t);
+ CHANGED_FOR_TYPE(double);
+ CHANGED_FOR_TYPE(std::string);
+#undef CHANGED_FOR_TYPE
+ }
+ return false;
+}
+
+// Direct-access flags can be modified without going through the
+// flag API. Detect such changes and updated the modified bit.
+void UpdateModifiedBit(CommandLineFlag* flag) {
+ if (!flag->IsAbseilFlag()) {
+ absl::MutexLock l(InitFlagIfNecessary(flag));
+ if (!flag->modified && ChangedDirectly(flag, flag->cur, flag->def)) {
+ flag->modified = true;
+ }
+ }
+}
+
+bool Validate(CommandLineFlag*, const void*) {
+ return true;
+}
+
+std::string HelpText::GetHelpText() const {
+ if (help_function_) return help_function_();
+ if (help_message_) return help_message_;
+
+ return {};
+}
+
+const int64_t CommandLineFlag::kAtomicInit;
+
+void CommandLineFlag::Read(void* dst,
+ const flags_internal::FlagOpFn dst_op) const {
+ absl::ReaderMutexLock l(
+ InitFlagIfNecessary(const_cast<CommandLineFlag*>(this)));
+
+ // `dst_op` is the unmarshaling operation corresponding to the declaration
+ // visibile at the call site. `op` is the Flag's defined unmarshalling
+ // operation. They must match for this operation to be well-defined.
+ if (ABSL_PREDICT_FALSE(dst_op != op)) {
+ ABSL_INTERNAL_LOG(
+ ERROR,
+ absl::StrCat("Flag '", name,
+ "' is defined as one type and declared as another"));
+ }
+ CopyConstruct(op, cur, dst);
+}
+
+void CommandLineFlag::Write(const void* src,
+ const flags_internal::FlagOpFn src_op) {
+ absl::Mutex* mu = InitFlagIfNecessary(this);
+ absl::MutexLock l(mu);
+
+ // `src_op` is the marshalling operation corresponding to the declaration
+ // visible at the call site. `op` is the Flag's defined marshalling operation.
+ // They must match for this operation to be well-defined.
+ if (ABSL_PREDICT_FALSE(src_op != op)) {
+ ABSL_INTERNAL_LOG(
+ ERROR,
+ absl::StrCat("Flag '", name,
+ "' is defined as one type and declared as another"));
+ }
+
+ if (ShouldValidateFlagValue(*this)) {
+ void* obj = Clone(op, src);
+ std::string ignored_error;
+ std::string src_as_str = Unparse(marshalling_op, src);
+ if (!Parse(marshalling_op, src_as_str, obj, &ignored_error) ||
+ !Validate(this, obj)) {
+ ABSL_INTERNAL_LOG(ERROR, absl::StrCat("Attempt to set flag '", name,
+ "' to invalid value ", src_as_str));
+ }
+ Delete(op, obj);
+ }
+
+ modified = true;
+ counter++;
+ Copy(op, src, cur);
+
+ UpdateCopy(this, mu);
+}
+
+absl::string_view CommandLineFlag::Typename() const {
+ // We do not store/report type in Abseil Flags, so that user do not rely on in
+ // at runtime
+ if (IsAbseilFlag() || IsRetired()) return "";
+
+#define HANDLE_V1_BUILTIN_TYPE(t) \
+ if (IsOfType<t>()) { \
+ return #t; \
+ }
+
+ HANDLE_V1_BUILTIN_TYPE(bool);
+ HANDLE_V1_BUILTIN_TYPE(int32_t);
+ HANDLE_V1_BUILTIN_TYPE(int64_t);
+ HANDLE_V1_BUILTIN_TYPE(uint64_t);
+ HANDLE_V1_BUILTIN_TYPE(double);
+#undef HANDLE_V1_BUILTIN_TYPE
+
+ if (IsOfType<std::string>()) {
+ return "string";
+ }
+
+ return "";
+}
+
+std::string CommandLineFlag::Filename() const {
+ return flags_internal::GetUsageConfig().normalize_filename(this->filename);
+}
+
+std::string CommandLineFlag::DefaultValue() const {
+ return Unparse(this->marshalling_op, this->def);
+}
+
+std::string CommandLineFlag::CurrentValue() const {
+ return Unparse(this->marshalling_op, this->cur);
+}
+
+void CommandLineFlag::SetCallback(
+ const flags_internal::FlagCallback mutation_callback) {
+ absl::Mutex* mu = InitFlagIfNecessary(this);
+ absl::MutexLock l(mu);
+
+ callback = mutation_callback;
+
+ InvokeCallback(this, mu);
+}
+
+// Attempts to parse supplied `value` string using parsing routine in the `flag`
+// argument. If parsing is successful, it will try to validate that the parsed
+// value is valid for the specified 'flag'. Finally this function stores the
+// parsed value in 'dst' assuming it is a pointer to the flag's value type. In
+// case if any error is encountered in either step, the error message is stored
+// in 'err'
+static bool TryParseLocked(CommandLineFlag* flag, void* dst,
+ absl::string_view value, std::string* err) {
+ void* tentative_value = Clone(flag->op, flag->def);
+ std::string parse_err;
+ if (!Parse(flag->marshalling_op, value, tentative_value, &parse_err)) {
+ auto type_name = flag->Typename();
+ absl::string_view err_sep = parse_err.empty() ? "" : "; ";
+ absl::string_view typename_sep = type_name.empty() ? "" : " ";
+ *err = absl::StrCat("Illegal value '", value, "' specified for",
+ typename_sep, type_name, " flag '", flag->Name(), "'",
+ err_sep, parse_err);
+ Delete(flag->op, tentative_value);
+ return false;
+ }
+
+ if (!Validate(flag, tentative_value)) {
+ *err = absl::StrCat("Failed validation of new value '",
+ Unparse(flag->marshalling_op, tentative_value),
+ "' for flag '", flag->Name(), "'");
+ Delete(flag->op, tentative_value);
+ return false;
+ }
+
+ flag->counter++;
+ Copy(flag->op, tentative_value, dst);
+ Delete(flag->op, tentative_value);
+ return true;
+}
+
+// Sets the value of the flag based on specified string `value`. If the flag
+// was successfully set to new value, it returns true. Otherwise, sets `err`
+// to indicate the error, leaves the flag unchanged, and returns false. There
+// are three ways to set the flag's value:
+// * Update the current flag value
+// * Update the flag's default value
+// * Update the current flag value if it was never set before
+// The mode is selected based on 'set_mode' parameter.
+bool CommandLineFlag::SetFromString(absl::string_view value,
+ FlagSettingMode set_mode,
+ ValueSource source, std::string* err) {
+ if (IsRetired()) return false;
+
+ UpdateModifiedBit(this);
+
+ absl::Mutex* mu = InitFlagIfNecessary(this);
+ absl::MutexLock l(mu);
+
+ switch (set_mode) {
+ case SET_FLAGS_VALUE: {
+ // set or modify the flag's value
+ if (!TryParseLocked(this, this->cur, value, err)) return false;
+ this->modified = true;
+ UpdateCopy(this, mu);
+
+ if (source == kCommandLine) {
+ this->on_command_line = true;
+ }
+ break;
+ }
+ case SET_FLAG_IF_DEFAULT: {
+ // set the flag's value, but only if it hasn't been set by someone else
+ if (!this->modified) {
+ if (!TryParseLocked(this, this->cur, value, err)) return false;
+ this->modified = true;
+ UpdateCopy(this, mu);
+ } else {
+ // TODO(rogeeff): review and fix this semantic. Currently we do not fail
+ // in this case if flag is modified. This is misleading since the flag's
+ // value is not updated even though we return true.
+ // *err = absl::StrCat(this->Name(), " is already set to ",
+ // CurrentValue(), "\n");
+ // return false;
+ return true;
+ }
+ break;
+ }
+ case SET_FLAGS_DEFAULT: {
+ // modify the flag's default-value
+ if (!TryParseLocked(this, this->def, value, err)) return false;
+
+ if (!this->modified) {
+ // Need to set both defvalue *and* current, in this case
+ Copy(this->op, this->def, this->cur);
+ UpdateCopy(this, mu);
+ }
+ break;
+ }
+ default: {
+ // unknown set_mode
+ assert(false);
+ return false;
+ }
+ }
+
+ return true;
+}
+
+} // namespace flags_internal
+} // namespace absl
diff --git a/absl/flags/internal/commandlineflag.h b/absl/flags/internal/commandlineflag.h
new file mode 100644
index 0000000..4815cdc
--- /dev/null
+++ b/absl/flags/internal/commandlineflag.h
@@ -0,0 +1,365 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
+#define ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
+
+#include <atomic>
+
+#include "absl/base/macros.h"
+#include "absl/flags/marshalling.h"
+#include "absl/synchronization/mutex.h"
+#include "absl/types/optional.h"
+
+namespace absl {
+namespace flags_internal {
+
+// Type-specific operations, eg., parsing, copying, etc. are provided
+// by function specific to that type with a signature matching FlagOpFn.
+enum FlagOp {
+ kDelete,
+ kClone,
+ kCopy,
+ kCopyConstruct,
+ kSizeof,
+ kParse,
+ kUnparse
+};
+using FlagOpFn = void* (*)(FlagOp, const void*, void*);
+using FlagMarshallingOpFn = void* (*)(FlagOp, const void*, void*, void*);
+
+// Options that control SetCommandLineOptionWithMode.
+enum FlagSettingMode {
+ // update the flag's value unconditionally (can call this multiple times).
+ SET_FLAGS_VALUE,
+ // update the flag's value, but *only if* it has not yet been updated
+ // with SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef".
+ SET_FLAG_IF_DEFAULT,
+ // set the flag's default value to this. If the flag has not been updated
+ // yet (via SET_FLAGS_VALUE, SET_FLAG_IF_DEFAULT, or "FLAGS_xxx = nondef")
+ // change the flag's current value to the new default value as well.
+ SET_FLAGS_DEFAULT
+};
+
+// Options that control SetFromString: Source of a value.
+enum ValueSource {
+ // Flag is being set by value specified on a command line.
+ kCommandLine,
+ // Flag is being set by value specified in the code.
+ kProgrammaticChange,
+};
+
+// Signature for the help generation function used as an argument for the
+// absl::Flag constructor.
+using HelpGenFunc = std::string (*)();
+
+// Signature for the function generating the initial flag value based (usually
+// based on default value supplied in flag's definition)
+using InitialValGenFunc = void* (*)();
+
+// Signature for the mutation callback used by watched Flags
+// The callback is noexcept.
+// TODO(rogeeff): add noexcept after C++17 support is added.
+using FlagCallback = void (*)();
+
+extern const char kStrippedFlagHelp[];
+
+// The per-type function
+template <typename T>
+void* FlagOps(FlagOp op, const void* v1, void* v2) {
+ switch (op) {
+ case kDelete:
+ delete static_cast<const T*>(v1);
+ return nullptr;
+ case kClone:
+ return new T(*static_cast<const T*>(v1));
+ case kCopy:
+ *static_cast<T*>(v2) = *static_cast<const T*>(v1);
+ return nullptr;
+ case kCopyConstruct:
+ new (v2) T(*static_cast<const T*>(v1));
+ return nullptr;
+ case kSizeof:
+ return reinterpret_cast<void*>(sizeof(T));
+ default:
+ return nullptr;
+ }
+}
+
+template <typename T>
+void* FlagMarshallingOps(FlagOp op, const void* v1, void* v2, void* v3) {
+ switch (op) {
+ case kParse: {
+ // initialize the temporary instance of type T based on current value in
+ // destination (which is going to be flag's default value).
+ T temp(*static_cast<T*>(v2));
+ if (!absl::ParseFlag<T>(*static_cast<const absl::string_view*>(v1), &temp,
+ static_cast<std::string*>(v3))) {
+ return nullptr;
+ }
+ *static_cast<T*>(v2) = std::move(temp);
+ return v2;
+ }
+ case kUnparse:
+ *static_cast<std::string*>(v2) =
+ absl::UnparseFlag<T>(*static_cast<const T*>(v1));
+ return nullptr;
+ default:
+ return nullptr;
+ }
+}
+
+// Functions that invoke flag-type-specific operations.
+inline void Delete(FlagOpFn op, const void* obj) {
+ op(flags_internal::kDelete, obj, nullptr);
+}
+
+inline void* Clone(FlagOpFn op, const void* obj) {
+ return op(flags_internal::kClone, obj, nullptr);
+}
+
+inline void Copy(FlagOpFn op, const void* src, void* dst) {
+ op(flags_internal::kCopy, src, dst);
+}
+
+inline void CopyConstruct(FlagOpFn op, const void* src, void* dst) {
+ op(flags_internal::kCopyConstruct, src, dst);
+}
+
+inline bool Parse(FlagMarshallingOpFn op, absl::string_view text, void* dst,
+ std::string* error) {
+ return op(flags_internal::kParse, &text, dst, error) != nullptr;
+}
+
+inline std::string Unparse(FlagMarshallingOpFn op, const void* val) {
+ std::string result;
+ op(flags_internal::kUnparse, val, &result, nullptr);
+ return result;
+}
+
+inline size_t Sizeof(FlagOpFn op) {
+ // This sequence of casts reverses the sequence from base::internal::FlagOps()
+ return static_cast<size_t>(reinterpret_cast<intptr_t>(
+ op(flags_internal::kSizeof, nullptr, nullptr)));
+}
+
+// The following struct contains the locks in a CommandLineFlag struct.
+// They are in a separate struct that is lazily allocated to avoid problems
+// with static initialization and to avoid multiple allocations.
+struct CommandLineFlagLocks {
+ absl::Mutex primary_mu; // protects several fields in CommandLineFlag
+ absl::Mutex callback_mu; // used to serialize callbacks
+};
+
+// Holds either a pointer to help text or a function which produces it. This is
+// needed for supporting both static initialization of Flags while supporting
+// the legacy registration framework. We can't use absl::variant<const char*,
+// const char*(*)()> since anybody passing 0 or nullptr in to a CommandLineFlag
+// would find an ambiguity.
+class HelpText {
+ public:
+ static constexpr HelpText FromFunctionPointer(const HelpGenFunc fn) {
+ return HelpText(fn, nullptr);
+ }
+ static constexpr HelpText FromStaticCString(const char* msg) {
+ return HelpText(nullptr, msg);
+ }
+
+ std::string GetHelpText() const;
+
+ HelpText() = delete;
+ HelpText(const HelpText&) = default;
+ HelpText(HelpText&&) = default;
+
+ private:
+ explicit constexpr HelpText(const HelpGenFunc fn, const char* msg)
+ : help_function_(fn), help_message_(msg) {}
+
+ HelpGenFunc help_function_;
+ const char* help_message_;
+};
+
+// Holds all information for a flag.
+struct CommandLineFlag {
+ constexpr CommandLineFlag(
+ const char* name_arg, HelpText help_text, const char* filename_arg,
+ const flags_internal::FlagOpFn op_arg,
+ const flags_internal::FlagMarshallingOpFn marshalling_op_arg,
+ const flags_internal::InitialValGenFunc initial_value_gen,
+ const bool retired_arg, void* def_arg, void* cur_arg)
+ : name(name_arg),
+ help(help_text),
+ filename(filename_arg),
+ op(op_arg),
+ marshalling_op(marshalling_op_arg),
+ make_init_value(initial_value_gen),
+ retired(retired_arg),
+ inited(false),
+ modified(false),
+ on_command_line(false),
+ validator(nullptr),
+ callback(nullptr),
+ def(def_arg),
+ cur(cur_arg),
+ counter(0),
+ atomic(kAtomicInit),
+ locks(nullptr) {}
+
+ // Not copyable/assignable.
+ CommandLineFlag(const CommandLineFlag&) = delete;
+ CommandLineFlag& operator=(const CommandLineFlag&) = delete;
+
+ absl::string_view Name() const { return name; }
+ std::string Help() const { return help.GetHelpText(); }
+ bool IsRetired() const { return this->retired; }
+ bool IsSpecifiedOnCommandLine() const { return on_command_line; }
+ // Returns true iff this is a handle to an Abseil Flag.
+ bool IsAbseilFlag() const {
+ // Set to null for V1 flags
+ return this->make_init_value != nullptr;
+ }
+
+ absl::string_view Typename() const;
+ std::string Filename() const;
+ std::string DefaultValue() const;
+ std::string CurrentValue() const;
+
+ // Return true iff flag has type T.
+ template <typename T>
+ inline bool IsOfType() const {
+ return this->op == &flags_internal::FlagOps<T>;
+ }
+
+ // Attempts to retrieve the flag value. Returns value on success,
+ // absl::nullopt otherwise.
+ template <typename T>
+ absl::optional<T> Get() {
+ if (IsRetired() || flags_internal::FlagOps<T> != this->op)
+ return absl::nullopt;
+
+ T res;
+ Read(&res, flags_internal::FlagOps<T>);
+
+ return res;
+ }
+
+ void SetCallback(const flags_internal::FlagCallback mutation_callback);
+
+ // Sets the value of the flag based on specified std::string `value`. If the flag
+ // was successfully set to new value, it returns true. Otherwise, sets `error`
+ // to indicate the error, leaves the flag unchanged, and returns false. There
+ // are three ways to set the flag's value:
+ // * Update the current flag value
+ // * Update the flag's default value
+ // * Update the current flag value if it was never set before
+ // The mode is selected based on `set_mode` parameter.
+ bool SetFromString(absl::string_view value,
+ flags_internal::FlagSettingMode set_mode,
+ flags_internal::ValueSource source, std::string* error);
+
+ // Constant configuration for a particular flag.
+ private:
+ const char* const name;
+ const HelpText help;
+ const char* const filename;
+
+ public:
+ const FlagOpFn op; // Type-specific handler
+ const FlagMarshallingOpFn marshalling_op; // Marshalling ops handler
+ const InitialValGenFunc make_init_value; // Makes initial value for the flag
+ const bool retired; // Is the flag retired?
+ std::atomic<bool> inited; // fields have been lazily initialized
+
+ // Mutable state (guarded by locks->primary_mu).
+ bool modified; // Has flag value been modified?
+ bool on_command_line; // Specified on command line.
+ bool (*validator)(); // Validator function, or nullptr
+ FlagCallback callback; // Mutation callback, or nullptr
+ void* def; // Lazily initialized pointer to default value
+ void* cur; // Lazily initialized pointer to current value
+ int64_t counter; // Mutation counter
+
+ // For some types, a copy of the current value is kept in an atomically
+ // accessible field.
+ static const int64_t kAtomicInit = 0xababababababababll;
+ std::atomic<int64_t> atomic;
+
+ // Lazily initialized mutexes for this flag value. We cannot inline a
+ // SpinLock or Mutex here because those have non-constexpr constructors and
+ // so would prevent constant initialization of this type.
+ // TODO(rogeeff): fix it once Mutex has constexpr constructor
+ struct CommandLineFlagLocks* locks; // locks, laziliy allocated.
+
+ // copy construct new value of flag's type in a memory referenced by dst
+ // based on current flag's value
+ void Read(void* dst, const flags_internal::FlagOpFn dst_op) const;
+ // updates flag's value to *src (locked)
+ void Write(const void* src, const flags_internal::FlagOpFn src_op);
+
+ ABSL_DEPRECATED(
+ "temporary until FlagName call sites are migrated and validator API is "
+ "changed")
+ const char* NameAsCString() const { return name; }
+
+ private:
+ friend class FlagRegistry;
+};
+
+// Ensure that the lazily initialized fields of *flag have been initialized,
+// and return &flag->locks->primary_mu.
+absl::Mutex* InitFlagIfNecessary(CommandLineFlag* flag);
+// Update any copy of the flag value that is stored in an atomic word.
+// In addition if flag has a mutation callback this function invokes it. While
+// callback is being invoked the primary flag's mutex is unlocked and it is
+// re-locked back after call to callback is completed. Callback invocation is
+// guarded by flag's secondary mutex instead which prevents concurrent callback
+// invocation. Note that it is possible for other thread to grab the primary
+// lock and update flag's value at any time during the callback invocation.
+// This is by design. Callback can get a value of the flag if necessary, but it
+// might be different from the value initiated the callback and it also can be
+// different by the time the callback invocation is completed.
+// Requires that *primary_lock be held in exclusive mode; it may be released
+// and reacquired by the implementation.
+void UpdateCopy(CommandLineFlag* flag, absl::Mutex* primary_lock);
+// Return true iff flag value was changed via direct-access.
+bool ChangedDirectly(CommandLineFlag* flag, const void* a, const void* b);
+// Direct-access flags can be modified without going through the
+// flag API. Detect such changes and updated the modified bit.
+void UpdateModifiedBit(CommandLineFlag* flag);
+// Invoke the flag validators for old flags.
+// TODO(rogeeff): implement proper validators for Abseil Flags
+bool Validate(CommandLineFlag* flag, const void* value);
+
+// This macro is the "source of truth" for the list of supported flag types we
+// expect to perform lock free operations on. Specifically it generates code,
+// a one argument macro operating on a type, supplied as a macro argument, for
+// each type in the list.
+#define ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(A) \
+ A(bool) \
+ A(short) \
+ A(unsigned short) \
+ A(int) \
+ A(unsigned int) \
+ A(long) \
+ A(unsigned long) \
+ A(long long) \
+ A(unsigned long long) \
+ A(double) \
+ A(float)
+
+} // namespace flags_internal
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_COMMANDLINEFLAG_H_
diff --git a/absl/flags/internal/commandlineflag_test.cc b/absl/flags/internal/commandlineflag_test.cc
new file mode 100644
index 0000000..705f301
--- /dev/null
+++ b/absl/flags/internal/commandlineflag_test.cc
@@ -0,0 +1,196 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/commandlineflag.h"
+
+#include "gtest/gtest.h"
+#include "absl/flags/flag.h"
+#include "absl/flags/internal/registry.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/match.h"
+#include "absl/strings/str_cat.h"
+
+ABSL_FLAG(int, int_flag, 201, "int_flag help");
+ABSL_FLAG(std::string, string_flag, "dflt",
+ absl::StrCat("string_flag", " help"));
+ABSL_RETIRED_FLAG(bool, bool_retired_flag, false, "bool_retired_flag help");
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+class CommandLineFlagTest : public testing::Test {
+ protected:
+ void SetUp() override { flag_saver_ = absl::make_unique<flags::FlagSaver>(); }
+ void TearDown() override { flag_saver_.reset(); }
+
+ private:
+ std::unique_ptr<flags::FlagSaver> flag_saver_;
+};
+
+TEST_F(CommandLineFlagTest, TestAttributesAccessMethods) {
+ auto* flag_01 = flags::FindCommandLineFlag("int_flag");
+
+ ASSERT_TRUE(flag_01);
+ EXPECT_EQ(flag_01->Name(), "int_flag");
+ EXPECT_EQ(flag_01->Help(), "int_flag help");
+ EXPECT_EQ(flag_01->Typename(), "");
+ EXPECT_TRUE(!flag_01->IsRetired());
+ EXPECT_TRUE(flag_01->IsOfType<int>());
+ EXPECT_TRUE(absl::EndsWith(
+ flag_01->Filename(),
+ "absl/flags/internal/commandlineflag_test.cc"));
+
+ auto* flag_02 = flags::FindCommandLineFlag("string_flag");
+
+ ASSERT_TRUE(flag_02);
+ EXPECT_EQ(flag_02->Name(), "string_flag");
+ EXPECT_EQ(flag_02->Help(), "string_flag help");
+ EXPECT_EQ(flag_02->Typename(), "");
+ EXPECT_TRUE(!flag_02->IsRetired());
+ EXPECT_TRUE(flag_02->IsOfType<std::string>());
+ EXPECT_TRUE(absl::EndsWith(
+ flag_02->Filename(),
+ "absl/flags/internal/commandlineflag_test.cc"));
+
+ auto* flag_03 = flags::FindRetiredFlag("bool_retired_flag");
+
+ ASSERT_TRUE(flag_03);
+ EXPECT_EQ(flag_03->Name(), "bool_retired_flag");
+ EXPECT_EQ(flag_03->Help(), "");
+ EXPECT_EQ(flag_03->Typename(), "");
+ EXPECT_TRUE(flag_03->IsRetired());
+ EXPECT_TRUE(flag_03->IsOfType<bool>());
+ EXPECT_EQ(flag_03->Filename(), "RETIRED");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestValueAccessMethods) {
+ absl::SetFlag(&FLAGS_int_flag, 301);
+ auto* flag_01 = flags::FindCommandLineFlag("int_flag");
+
+ ASSERT_TRUE(flag_01);
+ EXPECT_EQ(flag_01->CurrentValue(), "301");
+ EXPECT_EQ(flag_01->DefaultValue(), "201");
+
+ absl::SetFlag(&FLAGS_string_flag, "new_str_value");
+ auto* flag_02 = flags::FindCommandLineFlag("string_flag");
+
+ ASSERT_TRUE(flag_02);
+ EXPECT_EQ(flag_02->CurrentValue(), "new_str_value");
+ EXPECT_EQ(flag_02->DefaultValue(), "dflt");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestSetFromStringCurrentValue) {
+ std::string err;
+
+ auto* flag_01 = flags::FindCommandLineFlag("int_flag");
+ EXPECT_FALSE(flag_01->on_command_line);
+
+ EXPECT_TRUE(flag_01->SetFromString("11", flags::SET_FLAGS_VALUE,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
+ EXPECT_FALSE(flag_01->on_command_line);
+
+ EXPECT_TRUE(flag_01->SetFromString("-123", flags::SET_FLAGS_VALUE,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
+ EXPECT_FALSE(flag_01->on_command_line);
+
+ EXPECT_TRUE(!flag_01->SetFromString("xyz", flags::SET_FLAGS_VALUE,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
+ EXPECT_EQ(err, "Illegal value 'xyz' specified for flag 'int_flag'");
+ EXPECT_FALSE(flag_01->on_command_line);
+
+ EXPECT_TRUE(!flag_01->SetFromString("A1", flags::SET_FLAGS_VALUE,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), -123);
+ EXPECT_EQ(err, "Illegal value 'A1' specified for flag 'int_flag'");
+ EXPECT_FALSE(flag_01->on_command_line);
+
+ EXPECT_TRUE(flag_01->SetFromString("0x10", flags::SET_FLAGS_VALUE,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 16);
+ EXPECT_FALSE(flag_01->on_command_line);
+
+ EXPECT_TRUE(flag_01->SetFromString("011", flags::SET_FLAGS_VALUE,
+ flags::kCommandLine, &err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 11);
+ EXPECT_TRUE(flag_01->on_command_line);
+
+ EXPECT_TRUE(!flag_01->SetFromString("", flags::SET_FLAGS_VALUE,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(err, "Illegal value '' specified for flag 'int_flag'");
+
+ auto* flag_02 = flags::FindCommandLineFlag("string_flag");
+ EXPECT_TRUE(flag_02->SetFromString("xyz", flags::SET_FLAGS_VALUE,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "xyz");
+
+ EXPECT_TRUE(flag_02->SetFromString("", flags::SET_FLAGS_VALUE,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestSetFromStringDefaultValue) {
+ std::string err;
+
+ auto* flag_01 = flags::FindCommandLineFlag("int_flag");
+
+ EXPECT_TRUE(flag_01->SetFromString("111", flags::SET_FLAGS_DEFAULT,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(flag_01->DefaultValue(), "111");
+
+ auto* flag_02 = flags::FindCommandLineFlag("string_flag");
+
+ EXPECT_TRUE(flag_02->SetFromString("abc", flags::SET_FLAGS_DEFAULT,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(flag_02->DefaultValue(), "abc");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(CommandLineFlagTest, TestSetFromStringIfDefault) {
+ std::string err;
+
+ auto* flag_01 = flags::FindCommandLineFlag("int_flag");
+
+ EXPECT_TRUE(flag_01->SetFromString("22", flags::SET_FLAG_IF_DEFAULT,
+ flags::kProgrammaticChange, &err))
+ << err;
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
+
+ EXPECT_TRUE(flag_01->SetFromString("33", flags::SET_FLAG_IF_DEFAULT,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 22);
+ // EXPECT_EQ(err, "ERROR: int_flag is already set to 22");
+
+ // Reset back to default value
+ EXPECT_TRUE(flag_01->SetFromString("201", flags::SET_FLAGS_VALUE,
+ flags::kProgrammaticChange, &err));
+
+ EXPECT_TRUE(flag_01->SetFromString("33", flags::SET_FLAG_IF_DEFAULT,
+ flags::kProgrammaticChange, &err));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 201);
+ // EXPECT_EQ(err, "ERROR: int_flag is already set to 201");
+}
+
+} // namespace
diff --git a/absl/flags/internal/flag.h b/absl/flags/internal/flag.h
new file mode 100644
index 0000000..6402866
--- /dev/null
+++ b/absl/flags/internal/flag.h
@@ -0,0 +1,103 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_FLAG_H_
+#define ABSL_FLAGS_INTERNAL_FLAG_H_
+
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/flags/internal/registry.h"
+
+namespace absl {
+namespace flags_internal {
+
+// This is "unspecified" implementation of absl::Flag<T> type.
+template <typename T>
+class Flag {
+ public:
+ constexpr Flag(const char* name, const flags_internal::HelpGenFunc help_gen,
+ const char* filename,
+ const flags_internal::FlagMarshallingOpFn marshalling_op,
+ const flags_internal::InitialValGenFunc initial_value_gen)
+ : internal(name, flags_internal::HelpText::FromFunctionPointer(help_gen),
+ filename, &flags_internal::FlagOps<T>, marshalling_op,
+ initial_value_gen,
+ /*retired_arg=*/false, /*def_arg=*/nullptr,
+ /*cur_arg=*/nullptr) {}
+
+ // Not copyable/assignable.
+ Flag(const Flag<T>&) = delete;
+ Flag<T>& operator=(const Flag<T>&) = delete;
+
+ absl::string_view Name() const { return internal.Name(); }
+ std::string Help() const { return internal.Help(); }
+ std::string Filename() const { return internal.Filename(); }
+
+ absl::flags_internal::CommandLineFlag internal;
+
+ void SetCallback(const flags_internal::FlagCallback mutation_callback) {
+ internal.SetCallback(mutation_callback);
+ }
+
+ private:
+ // TODO(rogeeff): add these validations once UnparseFlag invocation is fixed
+ // for built-in types and when we cleanup existing code from operating on
+ // forward declared types.
+ // auto IsCopyConstructible(const T& v) -> decltype(T(v));
+ // auto HasAbslParseFlag(absl::string_view in, T* dst, std::string* err)
+ // -> decltype(AbslParseFlag(in, dst, GlobalStringADLGuard(err)));
+ // auto HasAbslUnparseFlag(const T& v) -> decltype(AbslUnparseFlag(v));
+};
+
+// This class facilitates Flag object registration and tail expression-based
+// flag definition, for example:
+// ABSL_FLAG(int, foo, 42, "Foo help").OnUpdate(NotifyFooWatcher);
+template <typename T, bool do_register>
+class FlagRegistrar {
+ public:
+ explicit FlagRegistrar(Flag<T>* flag) : flag_(flag) {
+ if (do_register) flags_internal::RegisterCommandLineFlag(&flag_->internal);
+ }
+
+ FlagRegistrar& OnUpdate(flags_internal::FlagCallback cb) && {
+ flag_->SetCallback(cb);
+ return *this;
+ }
+
+ // Make the registrar "die" gracefully as a bool on a line where registration
+ // happens. Registrar objects are intended to live only as temporary.
+ operator bool() const { return true; } // NOLINT
+
+ private:
+ Flag<T>* flag_; // Flag being registered (not owned).
+};
+
+// This struct and corresponding overload to MakeDefaultValue are used to
+// facilitate usage of {} as default value in ABSL_FLAG macro.
+struct EmptyBraces {};
+
+template <typename T>
+T* MakeFromDefaultValue(T t) {
+ return new T(std::move(t));
+}
+
+template <typename T>
+T* MakeFromDefaultValue(EmptyBraces) {
+ return new T;
+}
+
+} // namespace flags_internal
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_FLAG_H_
diff --git a/absl/flags/internal/parse.h b/absl/flags/internal/parse.h
new file mode 100644
index 0000000..fd3aca6
--- /dev/null
+++ b/absl/flags/internal/parse.h
@@ -0,0 +1,48 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_PARSE_H_
+#define ABSL_FLAGS_INTERNAL_PARSE_H_
+
+#include <string>
+#include <vector>
+
+#include "absl/flags/declare.h"
+
+ABSL_DECLARE_FLAG(std::vector<std::string>, flagfile);
+ABSL_DECLARE_FLAG(std::vector<std::string>, fromenv);
+ABSL_DECLARE_FLAG(std::vector<std::string>, tryfromenv);
+ABSL_DECLARE_FLAG(std::vector<std::string>, undefok);
+
+namespace absl {
+namespace flags_internal {
+
+enum class ArgvListAction { kRemoveParsedArgs, kKeepParsedArgs };
+enum class UsageFlagsAction { kHandleUsage, kIgnoreUsage };
+enum class OnUndefinedFlag {
+ kIgnoreUndefined,
+ kReportUndefined,
+ kAbortIfUndefined
+};
+
+std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
+ ArgvListAction arg_list_act,
+ UsageFlagsAction usage_flag_act,
+ OnUndefinedFlag on_undef_flag);
+
+} // namespace flags_internal
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_PARSE_H_
diff --git a/absl/flags/internal/path_util.h b/absl/flags/internal/path_util.h
new file mode 100644
index 0000000..5615c0e
--- /dev/null
+++ b/absl/flags/internal/path_util.h
@@ -0,0 +1,60 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
+#define ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
+
+#include "absl/strings/match.h"
+#include "absl/strings/string_view.h"
+
+namespace absl {
+namespace flags_internal {
+
+// A portable interface that returns the basename of the filename passed as an
+// argument. It is similar to basename(3)
+// <https://linux.die.net/man/3/basename>.
+// For example:
+// flags_internal::Basename("a/b/prog/file.cc")
+// returns "file.cc"
+// flags_internal::Basename("file.cc")
+// returns "file.cc"
+inline absl::string_view Basename(absl::string_view filename) {
+ auto last_slash_pos = filename.find_last_of("/\\");
+
+ return last_slash_pos == absl::string_view::npos
+ ? filename
+ : filename.substr(last_slash_pos + 1);
+}
+
+// A portable interface that returns the directory name of the filename
+// passed as an argument, including the trailing slash.
+// Returns the empty string if a slash is not found in the input file name.
+// For example:
+// flags_internal::Package("a/b/prog/file.cc")
+// returns "a/b/prog/"
+// flags_internal::Package("file.cc")
+// returns ""
+inline absl::string_view Package(absl::string_view filename) {
+ auto last_slash_pos = filename.find_last_of("/\\");
+
+ return last_slash_pos == absl::string_view::npos
+ ? absl::string_view()
+ : filename.substr(0, last_slash_pos + 1);
+}
+
+} // namespace flags_internal
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_PATH_UTIL_H_
diff --git a/absl/flags/internal/path_util_test.cc b/absl/flags/internal/path_util_test.cc
new file mode 100644
index 0000000..2091373
--- /dev/null
+++ b/absl/flags/internal/path_util_test.cc
@@ -0,0 +1,46 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/path_util.h"
+
+#include "gtest/gtest.h"
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+TEST(FlagsPathUtilTest, TestBasename) {
+ EXPECT_EQ(flags::Basename(""), "");
+ EXPECT_EQ(flags::Basename("a.cc"), "a.cc");
+ EXPECT_EQ(flags::Basename("dir/a.cc"), "a.cc");
+ EXPECT_EQ(flags::Basename("dir1/dir2/a.cc"), "a.cc");
+ EXPECT_EQ(flags::Basename("../dir1/dir2/a.cc"), "a.cc");
+ EXPECT_EQ(flags::Basename("/dir1/dir2/a.cc"), "a.cc");
+ EXPECT_EQ(flags::Basename("/dir1/dir2/../dir3/a.cc"), "a.cc");
+}
+
+// --------------------------------------------------------------------
+
+TEST(FlagsPathUtilTest, TestPackage) {
+ EXPECT_EQ(flags::Package(""), "");
+ EXPECT_EQ(flags::Package("a.cc"), "");
+ EXPECT_EQ(flags::Package("dir/a.cc"), "dir/");
+ EXPECT_EQ(flags::Package("dir1/dir2/a.cc"), "dir1/dir2/");
+ EXPECT_EQ(flags::Package("../dir1/dir2/a.cc"), "../dir1/dir2/");
+ EXPECT_EQ(flags::Package("/dir1/dir2/a.cc"), "/dir1/dir2/");
+ EXPECT_EQ(flags::Package("/dir1/dir2/../dir3/a.cc"), "/dir1/dir2/../dir3/");
+}
+
+} // namespace
diff --git a/absl/flags/internal/program_name.cc b/absl/flags/internal/program_name.cc
new file mode 100644
index 0000000..62be645
--- /dev/null
+++ b/absl/flags/internal/program_name.cc
@@ -0,0 +1,53 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/program_name.h"
+
+#include <string>
+
+#include "absl/flags/internal/path_util.h"
+#include "absl/synchronization/mutex.h"
+
+namespace absl {
+namespace flags_internal {
+
+ABSL_CONST_INIT static absl::Mutex program_name_guard(absl::kConstInit);
+ABSL_CONST_INIT static std::string* program_name
+ GUARDED_BY(program_name_guard) = nullptr;
+
+std::string ProgramInvocationName() {
+ absl::MutexLock l(&program_name_guard);
+
+ return program_name ? *program_name : "UNKNOWN";
+}
+
+std::string ShortProgramInvocationName() {
+ absl::MutexLock l(&program_name_guard);
+
+ return program_name ? std::string(flags_internal::Basename(*program_name))
+ : "UNKNOWN";
+}
+
+void SetProgramInvocationName(absl::string_view prog_name_str) {
+ absl::MutexLock l(&program_name_guard);
+
+ if (!program_name)
+ program_name = new std::string(prog_name_str);
+ else
+ program_name->assign(prog_name_str.data(), prog_name_str.size());
+}
+
+} // namespace flags_internal
+} // namespace absl
diff --git a/absl/flags/internal/program_name.h b/absl/flags/internal/program_name.h
new file mode 100644
index 0000000..326f24b
--- /dev/null
+++ b/absl/flags/internal/program_name.h
@@ -0,0 +1,47 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
+#define ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
+
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+// --------------------------------------------------------------------
+// Program name
+
+namespace absl {
+namespace flags_internal {
+
+// Returns program invocation name or "UNKNOWN" if `SetProgramInvocationName()`
+// is never called. At the moment this is always set to argv[0] as part of
+// library initialization.
+std::string ProgramInvocationName();
+
+// Returns base name for program invocation name. For example, if
+// ProgramInvocationName() == "a/b/mybinary"
+// then
+// ShortProgramInvocationName() == "mybinary"
+std::string ShortProgramInvocationName();
+
+// Sets program invocation name to a new value. Should only be called once
+// during program initialization, before any threads are spawned.
+void SetProgramInvocationName(absl::string_view prog_name_str);
+
+} // namespace flags_internal
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_PROGRAM_NAME_H_
diff --git a/absl/flags/internal/program_name_test.cc b/absl/flags/internal/program_name_test.cc
new file mode 100644
index 0000000..ed69218
--- /dev/null
+++ b/absl/flags/internal/program_name_test.cc
@@ -0,0 +1,60 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/program_name.h"
+
+#include "gtest/gtest.h"
+#include "absl/strings/match.h"
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+TEST(FlagsPathUtilTest, TestInitialProgamName) {
+ flags::SetProgramInvocationName("absl/flags/program_name_test");
+ std::string program_name = flags::ProgramInvocationName();
+ for (char& c : program_name)
+ if (c == '\\') c = '/';
+
+#if !defined(__wasm__) && !defined(__asmjs__)
+ const std::string expect_name = "absl/flags/program_name_test";
+ const std::string expect_basename = "program_name_test";
+#else
+ // For targets that generate javascript or webassembly the invocation name
+ // has the special value below.
+ const std::string expect_name = "this.program";
+ const std::string expect_basename = "this.program";
+#endif
+
+ EXPECT_TRUE(absl::EndsWith(program_name, expect_name)) << program_name;
+ EXPECT_EQ(flags::ShortProgramInvocationName(), expect_basename);
+}
+
+TEST(FlagsPathUtilTest, TestProgamNameInterfaces) {
+ flags::SetProgramInvocationName("a/my_test");
+
+ EXPECT_EQ(flags::ProgramInvocationName(), "a/my_test");
+ EXPECT_EQ(flags::ShortProgramInvocationName(), "my_test");
+
+ absl::string_view not_null_terminated("absl/aaa/bbb");
+ not_null_terminated = not_null_terminated.substr(1, 10);
+
+ flags::SetProgramInvocationName(not_null_terminated);
+
+ EXPECT_EQ(flags::ProgramInvocationName(), "bsl/aaa/bb");
+ EXPECT_EQ(flags::ShortProgramInvocationName(), "bb");
+}
+
+} // namespace
diff --git a/absl/flags/internal/registry.cc b/absl/flags/internal/registry.cc
new file mode 100644
index 0000000..435c5b0
--- /dev/null
+++ b/absl/flags/internal/registry.cc
@@ -0,0 +1,529 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/registry.h"
+
+#include "absl/base/call_once.h"
+#include "absl/base/dynamic_annotations.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/flags/config.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/string_view.h"
+#include "absl/synchronization/mutex.h"
+
+// --------------------------------------------------------------------
+// FlagRegistry implementation
+// A FlagRegistry holds all flag objects indexed
+// by their names so that if you know a flag's name you can access or
+// set it.
+
+namespace absl {
+namespace flags_internal {
+namespace {
+
+void DestroyFlag(CommandLineFlag* flag) NO_THREAD_SAFETY_ANALYSIS {
+ // Values are heap allocated for retired and Abseil Flags.
+ if (flag->IsRetired() || flag->IsAbseilFlag()) {
+ if (flag->cur) Delete(flag->op, flag->cur);
+ if (flag->def) Delete(flag->op, flag->def);
+ }
+
+ delete flag->locks;
+
+ // CommandLineFlag handle object is heap allocated for non Abseil Flags.
+ if (!flag->IsAbseilFlag()) {
+ delete flag;
+ }
+}
+
+// --------------------------------------------------------------------
+// FlagRegistry
+// A FlagRegistry singleton object holds all flag objects indexed
+// by their names so that if you know a flag's name (as a C
+// string), you can access or set it. If the function is named
+// FooLocked(), you must own the registry lock before calling
+// the function; otherwise, you should *not* hold the lock, and
+// the function will acquire it itself if needed.
+// --------------------------------------------------------------------
+
+// A map from flag pointer to CommandLineFlag*. Used when registering
+// validators.
+class FlagPtrMap {
+ public:
+ void Register(CommandLineFlag* flag) {
+ auto& vec = buckets_[BucketForFlag(flag->cur)];
+ if (vec.size() == vec.capacity()) {
+ // Bypass default 2x growth factor with 1.25 so we have fuller vectors.
+ // This saves 4% memory compared to default growth.
+ vec.reserve(vec.size() * 1.25 + 0.5);
+ }
+ vec.push_back(flag);
+ }
+
+ CommandLineFlag* FindByPtr(const void* flag_ptr) {
+ const auto& flag_vector = buckets_[BucketForFlag(flag_ptr)];
+ for (CommandLineFlag* entry : flag_vector) {
+ if (entry->cur == flag_ptr) {
+ return entry;
+ }
+ }
+ return nullptr;
+ }
+
+ private:
+ // Instead of std::map, we use a custom hash table where each bucket stores
+ // flags in a vector. This reduces memory usage 40% of the memory that would
+ // have been used by std::map.
+ //
+ // kNumBuckets was picked as a large enough prime. As of writing this code, a
+ // typical large binary has ~8k (old-style) flags, and this would gives
+ // buckets with roughly 50 elements each.
+ //
+ // Note that reads to this hash table are rare: exactly as many as we have
+ // flags with validators. As of writing, a typical binary only registers 52
+ // validated flags.
+ static constexpr size_t kNumBuckets = 163;
+ std::vector<CommandLineFlag*> buckets_[kNumBuckets];
+
+ static int BucketForFlag(const void* ptr) {
+ // Modulo a prime is good enough here. On a real program, bucket size stddev
+ // after registering 8k flags is ~5 (mean size at 51).
+ return reinterpret_cast<uintptr_t>(ptr) % kNumBuckets;
+ }
+};
+constexpr size_t FlagPtrMap::kNumBuckets;
+
+} // namespace
+
+class FlagRegistry {
+ public:
+ FlagRegistry() = default;
+ ~FlagRegistry() {
+ for (auto& p : flags_) {
+ DestroyFlag(p.second);
+ }
+ }
+
+ // Store a flag in this registry. Takes ownership of *flag.
+ // If ptr is non-null, the flag can later be found by calling
+ // FindFlagViaPtrLocked(ptr).
+ void RegisterFlag(CommandLineFlag* flag, const void* ptr);
+
+ void Lock() EXCLUSIVE_LOCK_FUNCTION(lock_) { lock_.Lock(); }
+ void Unlock() UNLOCK_FUNCTION(lock_) { lock_.Unlock(); }
+
+ // Returns the flag object for the specified name, or nullptr if not found.
+ // Will emit a warning if a 'retired' flag is specified.
+ CommandLineFlag* FindFlagLocked(absl::string_view name);
+
+ // Returns the retired flag object for the specified name, or nullptr if not
+ // found or not retired. Does not emit a warning.
+ CommandLineFlag* FindRetiredFlagLocked(absl::string_view name);
+
+ // Returns the flag object whose current-value is stored at flag_ptr.
+ CommandLineFlag* FindFlagViaPtrLocked(const void* flag_ptr);
+
+ static FlagRegistry* GlobalRegistry(); // returns a singleton registry
+
+ private:
+ friend class FlagSaverImpl; // reads all the flags in order to copy them
+ friend void ForEachFlagUnlocked(
+ std::function<void(CommandLineFlag*)> visitor);
+
+ // The map from name to flag, for FindFlagLocked().
+ using FlagMap = std::map<absl::string_view, CommandLineFlag*>;
+ using FlagIterator = FlagMap::iterator;
+ using FlagConstIterator = FlagMap::const_iterator;
+ FlagMap flags_;
+
+ FlagPtrMap flag_ptr_map_;
+
+ static FlagRegistry* global_registry_; // a singleton registry
+
+ static absl::once_flag global_registry_once_;
+
+ static void InitGlobalRegistry();
+
+ absl::Mutex lock_;
+
+ // Disallow
+ FlagRegistry(const FlagRegistry&);
+ FlagRegistry& operator=(const FlagRegistry&);
+};
+
+// Get the singleton FlagRegistry object
+FlagRegistry* FlagRegistry::global_registry_ = nullptr;
+absl::once_flag FlagRegistry::global_registry_once_;
+
+void FlagRegistry::InitGlobalRegistry() { global_registry_ = new FlagRegistry; }
+
+FlagRegistry* FlagRegistry::GlobalRegistry() {
+ absl::call_once(global_registry_once_, &InitGlobalRegistry);
+
+ return global_registry_;
+}
+
+namespace {
+
+class FlagRegistryLock {
+ public:
+ explicit FlagRegistryLock(FlagRegistry* fr) : fr_(fr) { fr_->Lock(); }
+ ~FlagRegistryLock() { fr_->Unlock(); }
+
+ private:
+ FlagRegistry* const fr_;
+};
+
+} // namespace
+
+void FlagRegistry::RegisterFlag(CommandLineFlag* flag, const void* ptr) {
+ FlagRegistryLock registry_lock(this);
+ std::pair<FlagIterator, bool> ins =
+ flags_.insert(FlagMap::value_type(flag->Name(), flag));
+ if (ins.second == false) { // means the name was already in the map
+ CommandLineFlag* old_flag = ins.first->second;
+ if (flag->IsRetired() != old_flag->IsRetired()) {
+ // All registrations must agree on the 'retired' flag.
+ flags_internal::ReportUsageError(
+ absl::StrCat(
+ "Retired flag '", flag->Name(),
+ "' was defined normally in file '",
+ (flag->IsRetired() ? old_flag->Filename() : flag->Filename()),
+ "'."),
+ true);
+ } else if (flag->op != old_flag->op) {
+ flags_internal::ReportUsageError(
+ absl::StrCat("Flag '", flag->Name(),
+ "' was defined more than once but with "
+ "differing types. Defined in files '",
+ old_flag->Filename(), "' and '", flag->Filename(),
+ "' with types '", old_flag->Typename(), "' and '",
+ flag->Typename(), "', respectively."),
+ true);
+ } else if (old_flag->IsRetired()) {
+ // Retired definitions are idempotent. Just keep the old one.
+ DestroyFlag(flag);
+ return;
+ } else if (old_flag->Filename() != flag->Filename()) {
+ flags_internal::ReportUsageError(
+ absl::StrCat("Flag '", flag->Name(),
+ "' was defined more than once (in files '",
+ old_flag->Filename(), "' and '", flag->Filename(),
+ "')."),
+ true);
+ } else {
+ flags_internal::ReportUsageError(
+ absl::StrCat(
+ "Something wrong with flag '", flag->Name(), "' in file '",
+ flag->Filename(), "'. One possibility: file '", flag->Filename(),
+ "' is being linked both statically and dynamically into this "
+ "executable. e.g. some files listed as srcs to a test and also "
+ "listed as srcs of some shared lib deps of the same test."),
+ true);
+ }
+ // All cases above are fatal, except for the retired flags.
+ std::exit(1);
+ }
+
+ if (ptr != nullptr) {
+ // This must be the first time we're seeing this flag.
+ flag_ptr_map_.Register(flag);
+ }
+}
+
+CommandLineFlag* FlagRegistry::FindFlagLocked(absl::string_view name) {
+ FlagConstIterator i = flags_.find(name);
+ if (i == flags_.end()) {
+ return nullptr;
+ }
+
+ if (i->second->IsRetired()) {
+ flags_internal::ReportUsageError(
+ absl::StrCat("Accessing retired flag '", name, "'"), false);
+ }
+
+ return i->second;
+}
+
+CommandLineFlag* FlagRegistry::FindRetiredFlagLocked(absl::string_view name) {
+ FlagConstIterator i = flags_.find(name);
+ if (i == flags_.end() || !i->second->IsRetired()) {
+ return nullptr;
+ }
+
+ return i->second;
+}
+
+CommandLineFlag* FlagRegistry::FindFlagViaPtrLocked(const void* flag_ptr) {
+ return flag_ptr_map_.FindByPtr(flag_ptr);
+}
+
+// --------------------------------------------------------------------
+// FlagSaver
+// FlagSaverImpl
+// This class stores the states of all flags at construct time,
+// and restores all flags to that state at destruct time.
+// Its major implementation challenge is that it never modifies
+// pointers in the 'main' registry, so global FLAG_* vars always
+// point to the right place.
+// --------------------------------------------------------------------
+
+class FlagSaverImpl {
+ public:
+ // Constructs an empty FlagSaverImpl object.
+ FlagSaverImpl() {}
+ ~FlagSaverImpl() {
+ // reclaim memory from each of our CommandLineFlags
+ for (const SavedFlag& src : backup_registry_) {
+ Delete(src.op, src.current);
+ Delete(src.op, src.default_value);
+ }
+ }
+
+ // Saves the flag states from the flag registry into this object.
+ // It's an error to call this more than once.
+ // Must be called when the registry mutex is not held.
+ void SaveFromRegistry() {
+ assert(backup_registry_.empty()); // call only once!
+ SavedFlag saved;
+ flags_internal::ForEachFlag([&](flags_internal::CommandLineFlag* flag) {
+ if (flag->IsRetired()) return;
+
+ saved.name = flag->Name();
+ saved.op = flag->op;
+ saved.marshalling_op = flag->marshalling_op;
+ {
+ absl::MutexLock l(InitFlagIfNecessary(flag));
+ saved.validator = flag->validator;
+ saved.modified = flag->modified;
+ saved.on_command_line = flag->IsSpecifiedOnCommandLine();
+ saved.current = Clone(saved.op, flag->cur);
+ saved.default_value = Clone(saved.op, flag->def);
+ saved.counter = flag->counter;
+ }
+ backup_registry_.push_back(saved);
+ });
+ }
+
+ // Restores the saved flag states into the flag registry. We
+ // assume no flags were added or deleted from the registry since
+ // the SaveFromRegistry; if they were, that's trouble! Must be
+ // called when the registry mutex is not held.
+ void RestoreToRegistry() {
+ FlagRegistry* const global_registry = FlagRegistry::GlobalRegistry();
+ FlagRegistryLock frl(global_registry);
+ for (const SavedFlag& src : backup_registry_) {
+ CommandLineFlag* flag = global_registry->FindFlagLocked(src.name);
+ // If null, flag got deleted from registry.
+ if (!flag) continue;
+
+ bool restored = false;
+ {
+ absl::Mutex* mu = InitFlagIfNecessary(flag);
+ absl::MutexLock l(mu);
+ flag->validator = src.validator;
+ flag->modified = src.modified;
+ flag->on_command_line = src.on_command_line;
+ if (flag->counter != src.counter ||
+ ChangedDirectly(flag, src.default_value, flag->def)) {
+ flag->counter++;
+ Copy(src.op, src.default_value, flag->def);
+ }
+ if (flag->counter != src.counter ||
+ ChangedDirectly(flag, src.current, flag->cur)) {
+ restored = true;
+ flag->counter++;
+ Copy(src.op, src.current, flag->cur);
+ UpdateCopy(flag, mu);
+
+ // Revalidate the flag because the validator might store state based
+ // on the flag's value, which just changed due to the restore.
+ // Failing validation is ignored because it's assumed that the flag
+ // was valid previously and there's little that can be done about it
+ // here, anyway.
+ Validate(flag, flag->cur);
+ }
+ }
+
+ // Log statements must be done when no flag lock is held.
+ if (restored) {
+ ABSL_INTERNAL_LOG(
+ INFO, absl::StrCat("Restore saved value of ", flag->Name(), ": ",
+ Unparse(src.marshalling_op, src.current)));
+ }
+ }
+ }
+
+ private:
+ struct SavedFlag {
+ absl::string_view name;
+ FlagOpFn op;
+ FlagMarshallingOpFn marshalling_op;
+ int64_t counter;
+ bool modified;
+ bool on_command_line;
+ bool (*validator)();
+ const void* current; // nullptr after restore
+ const void* default_value; // nullptr after restore
+ };
+
+ std::vector<SavedFlag> backup_registry_;
+
+ FlagSaverImpl(const FlagSaverImpl&); // no copying!
+ void operator=(const FlagSaverImpl&);
+};
+
+FlagSaver::FlagSaver() : impl_(new FlagSaverImpl()) {
+ impl_->SaveFromRegistry();
+}
+
+void FlagSaver::Ignore() {
+ delete impl_;
+ impl_ = nullptr;
+}
+
+FlagSaver::~FlagSaver() {
+ if (!impl_) return;
+
+ impl_->RestoreToRegistry();
+ delete impl_;
+}
+
+// --------------------------------------------------------------------
+// GetAllFlags()
+// The main way the FlagRegistry class exposes its data. This
+// returns, as strings, all the info about all the flags in
+// the main registry, sorted first by filename they are defined
+// in, and then by flagname.
+// --------------------------------------------------------------------
+
+struct FilenameFlagnameLess {
+ bool operator()(const CommandLineFlagInfo& a,
+ const CommandLineFlagInfo& b) const {
+ int cmp = absl::string_view(a.filename).compare(b.filename);
+ if (cmp != 0) return cmp < 0;
+ return a.name < b.name;
+ }
+};
+
+void FillCommandLineFlagInfo(CommandLineFlag* flag,
+ CommandLineFlagInfo* result) {
+ result->name = std::string(flag->Name());
+ result->type = std::string(flag->Typename());
+ result->description = flag->Help();
+ result->filename = flag->Filename();
+
+ UpdateModifiedBit(flag);
+
+ absl::MutexLock l(InitFlagIfNecessary(flag));
+ result->current_value = flag->CurrentValue();
+ result->default_value = flag->DefaultValue();
+ result->is_default = !flag->modified;
+ result->has_validator_fn = (flag->validator != nullptr);
+ result->flag_ptr = flag->IsAbseilFlag() ? nullptr : flag->cur;
+}
+
+// --------------------------------------------------------------------
+
+CommandLineFlag* FindCommandLineFlag(absl::string_view name) {
+ if (name.empty()) return nullptr;
+ FlagRegistry* const registry = FlagRegistry::GlobalRegistry();
+ FlagRegistryLock frl(registry);
+
+ return registry->FindFlagLocked(name);
+}
+
+CommandLineFlag* FindCommandLineV1Flag(const void* flag_ptr) {
+ FlagRegistry* const registry = FlagRegistry::GlobalRegistry();
+ FlagRegistryLock frl(registry);
+
+ return registry->FindFlagViaPtrLocked(flag_ptr);
+}
+
+CommandLineFlag* FindRetiredFlag(absl::string_view name) {
+ FlagRegistry* const registry = FlagRegistry::GlobalRegistry();
+ FlagRegistryLock frl(registry);
+
+ return registry->FindRetiredFlagLocked(name);
+}
+
+// --------------------------------------------------------------------
+
+void ForEachFlagUnlocked(std::function<void(CommandLineFlag*)> visitor) {
+ FlagRegistry* const registry = FlagRegistry::GlobalRegistry();
+ for (FlagRegistry::FlagConstIterator i = registry->flags_.begin();
+ i != registry->flags_.end(); ++i) {
+ visitor(i->second);
+ }
+}
+
+void ForEachFlag(std::function<void(CommandLineFlag*)> visitor) {
+ FlagRegistry* const registry = FlagRegistry::GlobalRegistry();
+ FlagRegistryLock frl(registry);
+ ForEachFlagUnlocked(visitor);
+}
+
+// --------------------------------------------------------------------
+
+void GetAllFlags(std::vector<CommandLineFlagInfo>* OUTPUT) {
+ flags_internal::ForEachFlag([&](CommandLineFlag* flag) {
+ if (flag->IsRetired()) return;
+
+ CommandLineFlagInfo fi;
+ FillCommandLineFlagInfo(flag, &fi);
+ OUTPUT->push_back(fi);
+ });
+
+ // Now sort the flags, first by filename they occur in, then alphabetically
+ std::sort(OUTPUT->begin(), OUTPUT->end(), FilenameFlagnameLess());
+}
+
+// --------------------------------------------------------------------
+
+bool RegisterCommandLineFlag(CommandLineFlag* flag, const void* ptr) {
+ FlagRegistry::GlobalRegistry()->RegisterFlag(flag, ptr);
+ return true;
+}
+
+// --------------------------------------------------------------------
+
+bool Retire(FlagOpFn ops, FlagMarshallingOpFn marshalling_ops,
+ const char* name) {
+ auto* flag = new CommandLineFlag(
+ name,
+ /*help_text=*/absl::flags_internal::HelpText::FromStaticCString(nullptr),
+ /*filename_arg=*/"RETIRED", ops, marshalling_ops,
+ /*initial_value_gen=*/nullptr,
+ /*retired_arg=*/true, nullptr, nullptr);
+ FlagRegistry::GlobalRegistry()->RegisterFlag(flag, nullptr);
+ return true;
+}
+
+// --------------------------------------------------------------------
+
+bool IsRetiredFlag(absl::string_view name, bool* type_is_bool) {
+ assert(!name.empty());
+ CommandLineFlag* flag = flags_internal::FindRetiredFlag(name);
+ if (flag == nullptr) {
+ return false;
+ }
+ assert(type_is_bool);
+ *type_is_bool = flag->IsOfType<bool>();
+ return true;
+}
+
+} // namespace flags_internal
+} // namespace absl
diff --git a/absl/flags/internal/registry.h b/absl/flags/internal/registry.h
new file mode 100644
index 0000000..bd141e1
--- /dev/null
+++ b/absl/flags/internal/registry.h
@@ -0,0 +1,168 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_REGISTRY_H_
+#define ABSL_FLAGS_INTERNAL_REGISTRY_H_
+
+#include <functional>
+#include <map>
+#include <string>
+
+#include "absl/base/macros.h"
+#include "absl/flags/internal/commandlineflag.h"
+
+// --------------------------------------------------------------------
+// Global flags registry API.
+
+namespace absl {
+namespace flags_internal {
+
+// CommandLineFlagInfo holds all information for a flag.
+struct CommandLineFlagInfo {
+ std::string name; // the name of the flag
+ std::string type; // DO NOT use. Use flag->IsOfType<T>() instead.
+ std::string description; // the "help text" associated with the flag
+ std::string current_value; // the current value, as a std::string
+ std::string default_value; // the default value, as a std::string
+ std::string filename; // 'cleaned' version of filename holding the flag
+ bool has_validator_fn; // true if RegisterFlagValidator called on this flag
+
+ bool is_default; // true if the flag has the default value and
+ // has not been set explicitly from the cmdline
+ // or via SetCommandLineOption.
+
+ // nullptr for ABSL_FLAG. A pointer to the flag's current value
+ // otherwise. E.g., for DEFINE_int32(foo, ...), flag_ptr will be
+ // &FLAGS_foo.
+ const void* flag_ptr;
+};
+
+//-----------------------------------------------------------------------------
+
+void FillCommandLineFlagInfo(CommandLineFlag* flag,
+ CommandLineFlagInfo* result);
+
+//-----------------------------------------------------------------------------
+
+CommandLineFlag* FindCommandLineFlag(absl::string_view name);
+CommandLineFlag* FindCommandLineV1Flag(const void* flag_ptr);
+CommandLineFlag* FindRetiredFlag(absl::string_view name);
+
+// Executes specified visitor for each non-retired flag in the registry.
+// Requires the caller hold the registry lock.
+void ForEachFlagUnlocked(std::function<void(CommandLineFlag*)> visitor);
+// Executes specified visitor for each non-retired flag in the registry. While
+// callback are executed, the registry is locked and can't be changed.
+void ForEachFlag(std::function<void(CommandLineFlag*)> visitor);
+
+//-----------------------------------------------------------------------------
+
+// Store the list of all flags in *OUTPUT, sorted by file.
+void GetAllFlags(std::vector<CommandLineFlagInfo>* OUTPUT);
+
+//-----------------------------------------------------------------------------
+
+bool RegisterCommandLineFlag(CommandLineFlag*, const void* ptr = nullptr);
+
+//-----------------------------------------------------------------------------
+// Retired registrations:
+//
+// Retired flag registrations are treated specially. A 'retired' flag is
+// provided only for compatibility with automated invocations that still
+// name it. A 'retired' flag:
+// - is not bound to a C++ FLAGS_ reference.
+// - has a type and a value, but that value is intentionally inaccessible.
+// - does not appear in --help messages.
+// - is fully supported by _all_ flag parsing routines.
+// - consumes args normally, and complains about type mismatches in its
+// argument.
+// - emits a complaint but does not die (e.g. LOG(ERROR)) if it is
+// accessed by name through the flags API for parsing or otherwise.
+//
+// The registrations for a flag happen in an unspecified order as the
+// initializers for the namespace-scope objects of a program are run.
+// Any number of weak registrations for a flag can weakly define the flag.
+// One non-weak registration will upgrade the flag from weak to non-weak.
+// Further weak registrations of a non-weak flag are ignored.
+//
+// This mechanism is designed to support moving dead flags into a
+// 'graveyard' library. An example migration:
+//
+// 0: Remove references to this FLAGS_flagname in the C++ codebase.
+// 1: Register as 'retired' in old_lib.
+// 2: Make old_lib depend on graveyard.
+// 3: Add a redundant 'retired' registration to graveyard.
+// 4: Remove the old_lib 'retired' registration.
+// 5: Eventually delete the graveyard registration entirely.
+//
+// Returns bool to enable use in namespace-scope initializers.
+// For example:
+//
+// static const bool dummy = base::RetiredFlag<int32_t>("myflag");
+//
+// Or to declare several at once:
+//
+// static bool dummies[] = {
+// base::RetiredFlag<std::string>("some_string_flag"),
+// base::RetiredFlag<double>("some_double_flag"),
+// base::RetiredFlag<int32_t>("some_int32_flag")
+// };
+
+// Retire flag with name "name" and type indicated by ops.
+bool Retire(FlagOpFn ops, FlagMarshallingOpFn marshalling_ops,
+ const char* name);
+
+// Registered a retired flag with name 'flag_name' and type 'T'.
+template <typename T>
+inline bool RetiredFlag(const char* flag_name) {
+ return flags_internal::Retire(flags_internal::FlagOps<T>,
+ flags_internal::FlagMarshallingOps<T>,
+ flag_name);
+}
+
+// If the flag is retired, returns true and indicates in |*type_is_bool|
+// whether the type of the retired flag is a bool.
+// Only to be called by code that needs to explicitly ignore retired flags.
+bool IsRetiredFlag(absl::string_view name, bool* type_is_bool);
+
+//-----------------------------------------------------------------------------
+// Saves the states (value, default value, whether the user has set
+// the flag, registered validators, etc) of all flags, and restores
+// them when the FlagSaver is destroyed.
+//
+// This class is thread-safe. However, its destructor writes to
+// exactly the set of flags that have changed value during its
+// lifetime, so concurrent _direct_ access to those flags
+// (i.e. FLAGS_foo instead of {Get,Set}CommandLineOption()) is unsafe.
+
+class FlagSaver {
+ public:
+ FlagSaver();
+ ~FlagSaver();
+
+ FlagSaver(const FlagSaver&) = delete;
+ void operator=(const FlagSaver&) = delete;
+
+ // Prevents saver from restoring the saved state of flags.
+ void Ignore();
+
+ private:
+ class FlagSaverImpl* impl_; // we use pimpl here to keep API steady
+};
+
+} // namespace flags_internal
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_REGISTRY_H_
diff --git a/absl/flags/internal/type_erased.cc b/absl/flags/internal/type_erased.cc
new file mode 100644
index 0000000..cc10398
--- /dev/null
+++ b/absl/flags/internal/type_erased.cc
@@ -0,0 +1,121 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/type_erased.h"
+
+#include "absl/base/internal/raw_logging.h"
+#include "absl/flags/config.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/str_cat.h"
+
+namespace absl {
+namespace flags_internal {
+
+bool GetCommandLineOption(absl::string_view name, std::string* value) {
+ if (name.empty()) return false;
+ assert(value);
+
+ CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+ if (flag == nullptr || flag->IsRetired()) {
+ return false;
+ }
+
+ absl::MutexLock l(InitFlagIfNecessary(flag));
+ *value = flag->CurrentValue();
+ return true;
+}
+
+bool GetCommandLineFlagInfo(absl::string_view name,
+ CommandLineFlagInfo* OUTPUT) {
+ if (name.empty()) return false;
+
+ CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+ if (flag == nullptr || flag->IsRetired()) {
+ return false;
+ }
+
+ assert(OUTPUT);
+ FillCommandLineFlagInfo(flag, OUTPUT);
+ return true;
+}
+
+CommandLineFlagInfo GetCommandLineFlagInfoOrDie(absl::string_view name) {
+ CommandLineFlagInfo info;
+ if (!GetCommandLineFlagInfo(name, &info)) {
+ ABSL_INTERNAL_LOG(FATAL, absl::StrCat("Flag '", name, "' does not exist"));
+ }
+ return info;
+}
+
+// --------------------------------------------------------------------
+
+bool SetCommandLineOption(absl::string_view name, absl::string_view value) {
+ return SetCommandLineOptionWithMode(name, value,
+ flags_internal::SET_FLAGS_VALUE);
+}
+
+bool SetCommandLineOptionWithMode(absl::string_view name,
+ absl::string_view value,
+ FlagSettingMode set_mode) {
+ CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+
+ if (!flag || flag->IsRetired()) return false;
+
+ std::string error;
+ if (!flag->SetFromString(value, set_mode, kProgrammaticChange, &error)) {
+ // Errors here are all of the form: the provided name was a recognized
+ // flag, but the value was invalid (bad type, or validation failed).
+ flags_internal::ReportUsageError(error, false);
+ return false;
+ }
+
+ return true;
+}
+
+// --------------------------------------------------------------------
+
+bool IsValidFlagValue(absl::string_view name, absl::string_view value) {
+ CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+ if (flag == nullptr) {
+ return false;
+ }
+
+ if (flag->IsRetired()) {
+ return true;
+ }
+
+ // No need to lock the flag since we are not mutating it.
+ void* obj = Clone(flag->op, flag->def);
+ std::string ignored_error;
+ const bool result =
+ flags_internal::Parse(flag->marshalling_op, value, obj, &ignored_error) &&
+ Validate(flag, obj);
+ Delete(flag->op, obj);
+ return result;
+}
+
+// --------------------------------------------------------------------
+
+bool SpecifiedOnCommandLine(absl::string_view name) {
+ CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+ if (flag != nullptr && !flag->IsRetired()) {
+ absl::MutexLock l(InitFlagIfNecessary(flag));
+ return flag->IsSpecifiedOnCommandLine();
+ }
+ return false;
+}
+
+} // namespace flags_internal
+} // namespace absl
diff --git a/absl/flags/internal/type_erased.h b/absl/flags/internal/type_erased.h
new file mode 100644
index 0000000..249d36b
--- /dev/null
+++ b/absl/flags/internal/type_erased.h
@@ -0,0 +1,97 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_
+#define ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_
+
+#include <string>
+
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/flags/internal/registry.h"
+
+// --------------------------------------------------------------------
+// Registry interfaces operating on type erased handles.
+
+namespace absl {
+namespace flags_internal {
+
+// If a flag named "name" exists, store its current value in *OUTPUT
+// and return true. Else return false without changing *OUTPUT.
+// Thread-safe.
+bool GetCommandLineOption(absl::string_view name, std::string* value);
+
+// If a flag named "name" exists, store its information in *OUTPUT
+// and return true. Else return false without changing *OUTPUT.
+// Thread-safe.
+bool GetCommandLineFlagInfo(absl::string_view name,
+ CommandLineFlagInfo* OUTPUT);
+
+// Returns the CommandLineFlagInfo of the flagname. exit() with an
+// error code if name not found.
+// Thread-safe.
+CommandLineFlagInfo GetCommandLineFlagInfoOrDie(absl::string_view name);
+
+// Set the value of the flag named "name" to value. If successful,
+// returns true. If not successful (e.g., the flag was not found or
+// the value is not a valid value), returns false.
+// Thread-safe.
+bool SetCommandLineOption(absl::string_view name, absl::string_view value);
+
+bool SetCommandLineOptionWithMode(absl::string_view name,
+ absl::string_view value,
+ FlagSettingMode set_mode);
+
+//-----------------------------------------------------------------------------
+
+// Returns true iff all of the following conditions are true:
+// (a) "name" names a registered flag
+// (b) "value" can be parsed succesfully according to the type of the flag
+// (c) parsed value passes any validator associated with the flag
+bool IsValidFlagValue(absl::string_view name, absl::string_view value);
+
+//-----------------------------------------------------------------------------
+
+// Returns true iff a flag named "name" was specified on the command line
+// (either directly, or via one of --flagfile or --fromenv or --tryfromenv).
+//
+// Any non-command-line modification of the flag does not affect the
+// result of this function. So for example, if a flag was passed on
+// the command line but then reset via SET_FLAGS_DEFAULT, this
+// function will still return true.
+bool SpecifiedOnCommandLine(absl::string_view name);
+
+//-----------------------------------------------------------------------------
+
+// If a flag with specified "name" exists and has type T, store
+// its current value in *dst and return true. Else return false
+// without touching *dst. T must obey all of the requirements for
+// types passed to DEFINE_FLAG.
+template <typename T>
+inline bool GetByName(absl::string_view name, T* dst) {
+ CommandLineFlag* flag = flags_internal::FindCommandLineFlag(name);
+ if (!flag) return false;
+
+ if (auto val = flag->Get<T>()) {
+ *dst = *val;
+ return true;
+ }
+
+ return false;
+}
+
+} // namespace flags_internal
+} // namespace absl
+
+#endif // ABSL_FLAGS_INTERNAL_TYPE_ERASED_H_
diff --git a/absl/flags/internal/type_erased_test.cc b/absl/flags/internal/type_erased_test.cc
new file mode 100644
index 0000000..ac749a6
--- /dev/null
+++ b/absl/flags/internal/type_erased_test.cc
@@ -0,0 +1,147 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/type_erased.h"
+
+#include <cmath>
+
+#include "gtest/gtest.h"
+#include "absl/flags/flag.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/str_cat.h"
+
+ABSL_FLAG(int, int_flag, 1, "int_flag help");
+ABSL_FLAG(std::string, string_flag, "dflt", "string_flag help");
+ABSL_RETIRED_FLAG(bool, bool_retired_flag, false, "bool_retired_flag help");
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+class TypeErasedTest : public testing::Test {
+ protected:
+ void SetUp() override { flag_saver_ = absl::make_unique<flags::FlagSaver>(); }
+ void TearDown() override { flag_saver_.reset(); }
+
+ private:
+ std::unique_ptr<flags::FlagSaver> flag_saver_;
+};
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestGetCommandLineOption) {
+ std::string value;
+ EXPECT_TRUE(flags::GetCommandLineOption("int_flag", &value));
+ EXPECT_EQ(value, "1");
+
+ EXPECT_TRUE(flags::GetCommandLineOption("string_flag", &value));
+ EXPECT_EQ(value, "dflt");
+
+ EXPECT_FALSE(flags::GetCommandLineOption("bool_retired_flag", &value));
+
+ EXPECT_FALSE(flags::GetCommandLineOption("unknown_flag", &value));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestSetCommandLineOption) {
+ EXPECT_TRUE(flags::SetCommandLineOption("int_flag", "101"));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
+
+ EXPECT_TRUE(flags::SetCommandLineOption("string_flag", "asdfgh"));
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
+
+ EXPECT_FALSE(flags::SetCommandLineOption("bool_retired_flag", "true"));
+
+ EXPECT_FALSE(flags::SetCommandLineOption("unknown_flag", "true"));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestSetCommandLineOptionWithMode_SET_FLAGS_VALUE) {
+ EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "101",
+ flags::SET_FLAGS_VALUE));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
+
+ EXPECT_TRUE(flags::SetCommandLineOptionWithMode("string_flag", "asdfgh",
+ flags::SET_FLAGS_VALUE));
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
+
+ EXPECT_FALSE(flags::SetCommandLineOptionWithMode("bool_retired_flag", "true",
+ flags::SET_FLAGS_VALUE));
+
+ EXPECT_FALSE(flags::SetCommandLineOptionWithMode("unknown_flag", "true",
+ flags::SET_FLAGS_VALUE));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestSetCommandLineOptionWithMode_SET_FLAG_IF_DEFAULT) {
+ EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "101",
+ flags::SET_FLAG_IF_DEFAULT));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
+
+ // This semantic is broken. We return true instead of false. Value is not
+ // updated.
+ EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "202",
+ flags::SET_FLAG_IF_DEFAULT));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 101);
+
+ EXPECT_TRUE(flags::SetCommandLineOptionWithMode("string_flag", "asdfgh",
+ flags::SET_FLAG_IF_DEFAULT));
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
+
+ EXPECT_FALSE(flags::SetCommandLineOptionWithMode("bool_retired_flag", "true",
+ flags::SET_FLAG_IF_DEFAULT));
+
+ EXPECT_FALSE(flags::SetCommandLineOptionWithMode("unknown_flag", "true",
+ flags::SET_FLAG_IF_DEFAULT));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestSetCommandLineOptionWithMode_SET_FLAGS_DEFAULT) {
+ EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "101",
+ flags::SET_FLAGS_DEFAULT));
+
+ EXPECT_TRUE(flags::SetCommandLineOptionWithMode("string_flag", "asdfgh",
+ flags::SET_FLAGS_DEFAULT));
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "asdfgh");
+
+ EXPECT_FALSE(flags::SetCommandLineOptionWithMode("bool_retired_flag", "true",
+ flags::SET_FLAGS_DEFAULT));
+
+ EXPECT_FALSE(flags::SetCommandLineOptionWithMode("unknown_flag", "true",
+ flags::SET_FLAGS_DEFAULT));
+
+ // This should be successfull, since flag is still is not set
+ EXPECT_TRUE(flags::SetCommandLineOptionWithMode("int_flag", "202",
+ flags::SET_FLAG_IF_DEFAULT));
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 202);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(TypeErasedTest, TestIsValidFlagValue) {
+ EXPECT_TRUE(flags::IsValidFlagValue("int_flag", "57"));
+ EXPECT_TRUE(flags::IsValidFlagValue("int_flag", "-101"));
+ EXPECT_FALSE(flags::IsValidFlagValue("int_flag", "1.1"));
+
+ EXPECT_TRUE(flags::IsValidFlagValue("string_flag", "#%^#%^$%DGHDG$W%adsf"));
+
+ EXPECT_TRUE(flags::IsValidFlagValue("bool_retired_flag", "true"));
+}
+
+} // namespace
diff --git a/absl/flags/internal/usage.cc b/absl/flags/internal/usage.cc
new file mode 100644
index 0000000..f17cc6c
--- /dev/null
+++ b/absl/flags/internal/usage.cc
@@ -0,0 +1,392 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/internal/usage.h"
+
+#include <map>
+#include <string>
+
+#include "absl/flags/flag.h"
+#include "absl/flags/internal/path_util.h"
+#include "absl/flags/internal/program_name.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/ascii.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_split.h"
+#include "absl/synchronization/mutex.h"
+
+ABSL_FLAG(bool, help, false,
+ "show help on important flags for this binary [tip: all flags can "
+ "have two dashes]");
+ABSL_FLAG(bool, helpfull, false, "show help on all flags");
+ABSL_FLAG(bool, helpshort, false,
+ "show help on only the main module for this program");
+ABSL_FLAG(bool, helppackage, false,
+ "show help on all modules in the main package");
+ABSL_FLAG(bool, version, false, "show version and build info and exit");
+ABSL_FLAG(bool, only_check_args, false, "exit after checking all flags");
+ABSL_FLAG(std::string, helpon, "",
+ "show help on the modules named by this flag value");
+ABSL_FLAG(std::string, helpmatch, "",
+ "show help on modules whose name contains the specified substr");
+
+namespace absl {
+namespace flags_internal {
+namespace {
+
+// This class is used to emit an XML element with `tag` and `text`.
+// It adds opening and closing tags and escapes special characters in the text.
+// For example:
+// std::cout << XMLElement("title", "Milk & Cookies");
+// prints "<title>Milk & Cookies</title>"
+class XMLElement {
+ public:
+ XMLElement(absl::string_view tag, absl::string_view txt)
+ : tag_(tag), txt_(txt) {}
+
+ friend std::ostream& operator<<(std::ostream& out,
+ const XMLElement& xml_elem) {
+ out << "<" << xml_elem.tag_ << ">";
+
+ for (auto c : xml_elem.txt_) {
+ switch (c) {
+ case '"':
+ out << """;
+ break;
+ case '\'':
+ out << "'";
+ break;
+ case '&':
+ out << "&";
+ break;
+ case '<':
+ out << "<";
+ break;
+ case '>':
+ out << ">";
+ break;
+ default:
+ out << c;
+ break;
+ }
+ }
+
+ return out << "</" << xml_elem.tag_ << ">";
+ }
+
+ private:
+ absl::string_view tag_;
+ absl::string_view txt_;
+};
+
+// --------------------------------------------------------------------
+// Helper class to pretty-print info about a flag.
+
+class FlagHelpPrettyPrinter {
+ public:
+ // Pretty printer holds on to the std::ostream& reference to direct an output
+ // to that stream.
+ FlagHelpPrettyPrinter(int max_line_len, std::ostream* out)
+ : out_(*out),
+ max_line_len_(max_line_len),
+ line_len_(0),
+ first_line_(true) {}
+
+ void Write(absl::string_view str, bool wrap_line = false) {
+ // Empty std::string - do nothing.
+ if (str.empty()) return;
+
+ std::vector<absl::string_view> tokens;
+ if (wrap_line) {
+ tokens = absl::StrSplit(str, absl::ByAnyChar(" \f\n\r\t\v"),
+ absl::SkipEmpty());
+ } else {
+ tokens.push_back(str);
+ }
+
+ for (auto token : tokens) {
+ bool new_line = (line_len_ == 0);
+
+ // Write the token, ending the std::string first if necessary/possible.
+ if (!new_line && (line_len_ + token.size() >= max_line_len_)) {
+ EndLine();
+ new_line = true;
+ }
+
+ if (new_line) {
+ StartLine();
+ } else {
+ out_ << ' ';
+ ++line_len_;
+ }
+
+ out_ << token;
+ line_len_ += token.size();
+ }
+ }
+
+ void StartLine() {
+ if (first_line_) {
+ out_ << " ";
+ line_len_ = 4;
+ first_line_ = false;
+ } else {
+ out_ << " ";
+ line_len_ = 6;
+ }
+ }
+ void EndLine() {
+ out_ << '\n';
+ line_len_ = 0;
+ }
+
+ private:
+ std::ostream& out_;
+ const int max_line_len_;
+ int line_len_;
+ bool first_line_;
+};
+
+void FlagHelpHumanReadable(const flags_internal::CommandLineFlag& flag,
+ std::ostream* out) {
+ FlagHelpPrettyPrinter printer(80, out); // Max line length is 80.
+
+ // Flag name.
+ printer.Write(absl::StrCat("-", flag.Name()));
+
+ // Flag help.
+ printer.Write(absl::StrCat("(", flag.Help(), ");"), /*wrap_line=*/true);
+
+ // Flag data type (for V1 flags only).
+ if (!flag.IsAbseilFlag() && !flag.IsRetired()) {
+ printer.Write(absl::StrCat("type: ", flag.Typename(), ";"));
+ }
+
+ // The listed default value will be the actual default from the flag
+ // definition in the originating source file, unless the value has
+ // subsequently been modified using SetCommandLineOption() with mode
+ // SET_FLAGS_DEFAULT.
+ std::string dflt_val = flag.DefaultValue();
+ if (flag.IsOfType<std::string>()) {
+ dflt_val = absl::StrCat("\"", dflt_val, "\"");
+ }
+ printer.Write(absl::StrCat("default: ", dflt_val, ";"));
+
+ if (flag.modified) {
+ std::string curr_val = flag.CurrentValue();
+ if (flag.IsOfType<std::string>()) {
+ curr_val = absl::StrCat("\"", curr_val, "\"");
+ }
+ printer.Write(absl::StrCat("currently: ", curr_val, ";"));
+ }
+
+ printer.EndLine();
+}
+
+// Shows help for every filename which matches any of the filters
+// If filters are empty, shows help for every file.
+// If a flag's help message has been stripped (e.g. by adding '#define
+// STRIP_FLAG_HELP 1' then this flag will not be displayed by '--help'
+// and its variants.
+void FlagsHelpImpl(std::ostream& out, flags_internal::FlagKindFilter filter_cb,
+ HelpFormat format = HelpFormat::kHumanReadable) {
+ if (format == HelpFormat::kHumanReadable) {
+ out << flags_internal::ShortProgramInvocationName() << ": "
+ << flags_internal::ProgramUsageMessage() << "\n\n";
+ } else {
+ // XML schema is not a part of our public API for now.
+ out << "<?xml version=\"1.0\"?>\n"
+ // The document.
+ << "<AllFlags>\n"
+ // The program name and usage.
+ << XMLElement("program", flags_internal::ShortProgramInvocationName())
+ << '\n'
+ << XMLElement("usage", flags_internal::ProgramUsageMessage()) << '\n';
+ }
+
+ // Map of package name to
+ // map of file name to
+ // vector of flags in the file.
+ // This map is used to output matching flags grouped by package and file
+ // name.
+ std::map<std::string,
+ std::map<std::string,
+ std::vector<const flags_internal::CommandLineFlag*>>>
+ matching_flags;
+
+ flags_internal::ForEachFlag([&](flags_internal::CommandLineFlag* flag) {
+ absl::MutexLock l(InitFlagIfNecessary(flag));
+
+ std::string flag_filename = flag->Filename();
+
+ // Ignore retired flags.
+ if (flag->IsRetired()) return;
+
+ // If the flag has been stripped, pretend that it doesn't exist.
+ if (flag->Help() == flags_internal::kStrippedFlagHelp) return;
+
+ // Make sure flag satisfies the filter
+ if (!filter_cb || !filter_cb(flag_filename)) return;
+
+ matching_flags[std::string(flags_internal::Package(flag_filename))]
+ [flag_filename]
+ .push_back(flag);
+ });
+
+ absl::string_view
+ package_separator; // controls blank lines between packages.
+ absl::string_view file_separator; // controls blank lines between files.
+ for (const auto& package : matching_flags) {
+ if (format == HelpFormat::kHumanReadable) {
+ out << package_separator;
+ package_separator = "\n\n";
+ }
+
+ file_separator = "";
+ for (const auto& flags_in_file : package.second) {
+ if (format == HelpFormat::kHumanReadable) {
+ out << file_separator << " Flags from " << flags_in_file.first
+ << ":\n";
+ file_separator = "\n";
+ }
+
+ for (const auto* flag : flags_in_file.second) {
+ flags_internal::FlagHelp(out, *flag, format);
+ }
+ }
+ }
+
+ if (format == HelpFormat::kHumanReadable) {
+ if (filter_cb && matching_flags.empty()) {
+ out << " No modules matched: use -helpfull\n";
+ }
+ } else {
+ // The end of the document.
+ out << "</AllFlags>\n";
+ }
+}
+
+ABSL_CONST_INIT absl::Mutex usage_message_guard(absl::kConstInit);
+ABSL_CONST_INIT std::string* program_usage_message
+ GUARDED_BY(usage_message_guard) = nullptr;
+
+} // namespace
+
+// --------------------------------------------------------------------
+// Sets the "usage" message to be used by help reporting routines.
+
+void SetProgramUsageMessage(absl::string_view new_usage_message) {
+ absl::MutexLock l(&usage_message_guard);
+
+ if (flags_internal::program_usage_message != nullptr) {
+ ABSL_INTERNAL_LOG(FATAL, "SetProgramUsageMessage() called twice.");
+ std::exit(1);
+ }
+
+ program_usage_message = new std::string(new_usage_message);
+}
+
+// --------------------------------------------------------------------
+// Returns the usage message set by SetProgramUsageMessage().
+// Note: We able to return string_view here only because calling
+// SetProgramUsageMessage twice is prohibited.
+absl::string_view ProgramUsageMessage() {
+ absl::MutexLock l(&usage_message_guard);
+
+ return program_usage_message != nullptr
+ ? absl::string_view(*program_usage_message)
+ : "Warning: SetProgramUsageMessage() never called";
+}
+
+// --------------------------------------------------------------------
+// Produces the help message describing specific flag.
+void FlagHelp(std::ostream& out, const flags_internal::CommandLineFlag& flag,
+ HelpFormat format) {
+ if (format == HelpFormat::kHumanReadable)
+ flags_internal::FlagHelpHumanReadable(flag, &out);
+}
+
+// --------------------------------------------------------------------
+// Produces the help messages for all flags matching the filter.
+// If filter is empty produces help messages for all flags.
+void FlagsHelp(std::ostream& out, absl::string_view filter, HelpFormat format) {
+ flags_internal::FlagKindFilter filter_cb = [&](absl::string_view filename) {
+ return filter.empty() || filename.find(filter) != absl::string_view::npos;
+ };
+ flags_internal::FlagsHelpImpl(out, filter_cb, format);
+}
+
+// --------------------------------------------------------------------
+// Checks all the 'usage' command line flags to see if any have been set.
+// If so, handles them appropriately.
+int HandleUsageFlags(std::ostream& out) {
+ if (absl::GetFlag(FLAGS_helpshort)) {
+ flags_internal::FlagsHelpImpl(
+ out, flags_internal::GetUsageConfig().contains_helpshort_flags,
+ HelpFormat::kHumanReadable);
+ return 1;
+ }
+
+ if (absl::GetFlag(FLAGS_helpfull)) {
+ // show all options
+ flags_internal::FlagsHelp(out);
+ return 1;
+ }
+
+ if (!absl::GetFlag(FLAGS_helpon).empty()) {
+ flags_internal::FlagsHelp(
+ out, absl::StrCat("/", absl::GetFlag(FLAGS_helpon), "."));
+ return 1;
+ }
+
+ if (!absl::GetFlag(FLAGS_helpmatch).empty()) {
+ flags_internal::FlagsHelp(out, absl::GetFlag(FLAGS_helpmatch));
+ return 1;
+ }
+
+ if (absl::GetFlag(FLAGS_help)) {
+ flags_internal::FlagsHelpImpl(
+ out, flags_internal::GetUsageConfig().contains_help_flags);
+
+ out << "\nTry --helpfull to get a list of all flags.\n";
+
+ return 1;
+ }
+
+ if (absl::GetFlag(FLAGS_helppackage)) {
+ flags_internal::FlagsHelpImpl(
+ out, flags_internal::GetUsageConfig().contains_helppackage_flags);
+
+ out << "\nTry --helpfull to get a list of all flags.\n";
+
+ return 1;
+ }
+
+ if (absl::GetFlag(FLAGS_version)) {
+ if (flags_internal::GetUsageConfig().version_string)
+ out << flags_internal::GetUsageConfig().version_string();
+ // Unlike help, we may be asking for version in a script, so return 0
+ return 0;
+ }
+
+ if (absl::GetFlag(FLAGS_only_check_args)) {
+ return 0;
+ }
+
+ return -1;
+}
+
+} // namespace flags_internal
+} // namespace absl
diff --git a/absl/flags/internal/usage.h b/absl/flags/internal/usage.h
new file mode 100644
index 0000000..2d0ea7a
--- /dev/null
+++ b/absl/flags/internal/usage.h
@@ -0,0 +1,91 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef ABSL_FLAGS_INTERNAL_USAGE_H_
+#define ABSL_FLAGS_INTERNAL_USAGE_H_
+
+#include <iosfwd>
+#include <string>
+
+#include "absl/flags/declare.h"
+#include "absl/flags/internal/commandlineflag.h"
+#include "absl/strings/string_view.h"
+
+// --------------------------------------------------------------------
+// Usage reporting interfaces
+
+namespace absl {
+namespace flags_internal {
+
+// Sets the "usage" message to be used by help reporting routines.
+// For example:
+// absl::SetProgramUsageMessage(
+// absl::StrCat("This program does nothing. Sample usage:\n", argv[0],
+// " <uselessarg1> <uselessarg2>"));
+// Do not include commandline flags in the usage: we do that for you!
+// Note: Calling SetProgramUsageMessage twice will trigger a call to std::exit.
+void SetProgramUsageMessage(absl::string_view new_usage_message);
+
+// Returns the usage message set by SetProgramUsageMessage().
+absl::string_view ProgramUsageMessage();
+
+// --------------------------------------------------------------------
+
+// The format to report the help messages in.
+enum class HelpFormat {
+ kHumanReadable,
+};
+
+// Outputs the help message describing specific flag.
+void FlagHelp(std::ostream& out, const flags_internal::CommandLineFlag& flag,
+ HelpFormat format = HelpFormat::kHumanReadable);
+
+// Produces the help messages for all flags matching the filter. A flag matches
+// the filter if it is defined in a file with a filename which includes
+// filter string as a substring. You can use '/' and '.' to restrict the
+// matching to a specific file names. For example:
+// FlagsHelp(out, "/path/to/file.");
+// restricts help to only flags which resides in files named like:
+// .../path/to/file.<ext>
+// for any extension 'ext'. If the filter is empty this function produces help
+// messages for all flags.
+void FlagsHelp(std::ostream& out, absl::string_view filter = {},
+ HelpFormat format = HelpFormat::kHumanReadable);
+
+// --------------------------------------------------------------------
+
+// If any of the 'usage' related command line flags (listed on the bottom of
+// this file) has been set this routine produces corresponding help message in
+// the specified output stream and returns:
+// 0 - if "version" or "only_check_flags" flags were set and handled.
+// 1 - if some other 'usage' related flag was set and handled.
+// -1 - if no usage flags were set on a commmand line.
+// Non negative return values are expected to be used as an exit code for a
+// binary.
+int HandleUsageFlags(std::ostream& out);
+
+} // namespace flags_internal
+} // namespace absl
+
+ABSL_DECLARE_FLAG(bool, help);
+ABSL_DECLARE_FLAG(bool, helpfull);
+ABSL_DECLARE_FLAG(bool, helpshort);
+ABSL_DECLARE_FLAG(bool, helppackage);
+ABSL_DECLARE_FLAG(bool, version);
+ABSL_DECLARE_FLAG(bool, only_check_args);
+ABSL_DECLARE_FLAG(std::string, helpon);
+ABSL_DECLARE_FLAG(std::string, helpmatch);
+
+#endif // ABSL_FLAGS_INTERNAL_USAGE_H_
diff --git a/absl/flags/internal/usage_test.cc b/absl/flags/internal/usage_test.cc
new file mode 100644
index 0000000..cb40aa4
--- /dev/null
+++ b/absl/flags/internal/usage_test.cc
@@ -0,0 +1,367 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include <sstream>
+
+#include "gtest/gtest.h"
+#include "absl/flags/flag.h"
+#include "absl/flags/parse.h"
+#include "absl/flags/internal/path_util.h"
+#include "absl/flags/internal/program_name.h"
+#include "absl/flags/internal/usage.h"
+#include "absl/flags/usage_config.h"
+#include "absl/memory/memory.h"
+#include "absl/strings/match.h"
+
+ABSL_FLAG(int, usage_reporting_test_flag_01, 101,
+ "usage_reporting_test_flag_01 help message");
+ABSL_FLAG(bool, usage_reporting_test_flag_02, false,
+ "usage_reporting_test_flag_02 help message");
+ABSL_FLAG(double, usage_reporting_test_flag_03, 1.03,
+ "usage_reporting_test_flag_03 help message");
+ABSL_FLAG(int64_t, usage_reporting_test_flag_04, 1000000000000004L,
+ "usage_reporting_test_flag_04 help message");
+
+struct UDT {
+ UDT() = default;
+ UDT(const UDT&) = default;
+};
+bool AbslParseFlag(absl::string_view, UDT*, std::string*) { return true; }
+std::string AbslUnparseFlag(const UDT&) { return "UDT{}"; }
+
+ABSL_FLAG(UDT, usage_reporting_test_flag_05, {},
+ "usage_reporting_test_flag_05 help message");
+
+namespace {
+
+namespace flags = absl::flags_internal;
+
+static std::string NormalizeFileName(absl::string_view fname) {
+#ifdef _WIN32
+ std::string normalized(fname);
+ std::replace(normalized.begin(), normalized.end(), '\\', '/');
+ fname = normalized;
+#endif
+
+ auto absl_pos = fname.find("/absl/");
+ if (absl_pos != absl::string_view::npos) {
+ fname = fname.substr(absl_pos + 1);
+ }
+ return std::string(fname);
+}
+
+class UsageReportingTest : public testing::Test {
+ protected:
+ UsageReportingTest() {
+ // Install default config for the use on this unit test.
+ // Binary may install a custom config before tests are run.
+ absl::FlagsUsageConfig default_config;
+ default_config.normalize_filename = &NormalizeFileName;
+ absl::SetFlagsUsageConfig(default_config);
+ }
+
+ private:
+ flags::FlagSaver flag_saver_;
+};
+
+// --------------------------------------------------------------------
+
+using UsageReportingDeathTest = UsageReportingTest;
+
+TEST_F(UsageReportingDeathTest, TestSetProgramUsageMessage) {
+ EXPECT_EQ(flags::ProgramUsageMessage(), "Custom usage message");
+
+#ifndef _WIN32
+ // TODO(rogeeff): figure out why this does not work on Windows.
+ EXPECT_DEATH(flags::SetProgramUsageMessage("custom usage message"),
+ ".*SetProgramUsageMessage\\(\\) called twice.*");
+#endif
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_01) {
+ const auto* flag = flags::FindCommandLineFlag("usage_reporting_test_flag_01");
+ std::stringstream test_buf;
+
+ flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(
+ test_buf.str(),
+ R"( -usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+)");
+}
+
+TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_02) {
+ const auto* flag = flags::FindCommandLineFlag("usage_reporting_test_flag_02");
+ std::stringstream test_buf;
+
+ flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(
+ test_buf.str(),
+ R"( -usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+)");
+}
+
+TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_03) {
+ const auto* flag = flags::FindCommandLineFlag("usage_reporting_test_flag_03");
+ std::stringstream test_buf;
+
+ flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(
+ test_buf.str(),
+ R"( -usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+)");
+}
+
+TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_04) {
+ const auto* flag = flags::FindCommandLineFlag("usage_reporting_test_flag_04");
+ std::stringstream test_buf;
+
+ flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(
+ test_buf.str(),
+ R"( -usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+)");
+}
+
+TEST_F(UsageReportingTest, TestFlagHelpHRF_on_flag_05) {
+ const auto* flag = flags::FindCommandLineFlag("usage_reporting_test_flag_05");
+ std::stringstream test_buf;
+
+ flags::FlagHelp(test_buf, *flag, flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(
+ test_buf.str(),
+ R"( -usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+)");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestFlagsHelpHRF) {
+ std::string usage_test_flags_out =
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ -usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ -usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ -usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ -usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ -usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+)";
+
+ std::stringstream test_buf_01;
+ flags::FlagsHelp(test_buf_01, "usage_test.cc",
+ flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(test_buf_01.str(), usage_test_flags_out);
+
+ std::stringstream test_buf_02;
+ flags::FlagsHelp(test_buf_02, "flags/internal/usage_test.cc",
+ flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(test_buf_02.str(), usage_test_flags_out);
+
+ std::stringstream test_buf_03;
+ flags::FlagsHelp(test_buf_03, "usage_test",
+ flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(test_buf_03.str(), usage_test_flags_out);
+
+ std::stringstream test_buf_04;
+ flags::FlagsHelp(test_buf_04, "flags/invalid_file_name.cc",
+ flags::HelpFormat::kHumanReadable);
+ EXPECT_EQ(test_buf_04.str(),
+ R"(usage_test: Custom usage message
+
+ No modules matched: use -helpfull
+)");
+
+ std::stringstream test_buf_05;
+ flags::FlagsHelp(test_buf_05, "", flags::HelpFormat::kHumanReadable);
+ std::string test_out = test_buf_05.str();
+ absl::string_view test_out_str(test_out);
+ EXPECT_TRUE(
+ absl::StartsWith(test_out_str, "usage_test: Custom usage message"));
+ EXPECT_TRUE(absl::StrContains(
+ test_out_str, "Flags from absl/flags/internal/usage_test.cc:"));
+ EXPECT_TRUE(absl::StrContains(test_out_str,
+ "Flags from absl/flags/internal/usage.cc:"));
+ EXPECT_TRUE(
+ absl::StrContains(test_out_str, "-usage_reporting_test_flag_01 "));
+ EXPECT_TRUE(absl::StrContains(test_out_str, "-help (show help"))
+ << test_out_str;
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestNoUsageFlags) {
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf), -1);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_helpshort) {
+ absl::SetFlag(&FLAGS_helpshort, true);
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf), 1);
+ EXPECT_EQ(test_buf.str(),
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ -usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ -usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ -usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ -usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ -usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+)");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_help) {
+ absl::SetFlag(&FLAGS_help, true);
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf), 1);
+ EXPECT_EQ(test_buf.str(),
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ -usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ -usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ -usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ -usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ -usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+
+Try --helpfull to get a list of all flags.
+)");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_helppackage) {
+ absl::SetFlag(&FLAGS_helppackage, true);
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf), 1);
+ EXPECT_EQ(test_buf.str(),
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ -usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ -usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ -usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ -usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ -usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+
+Try --helpfull to get a list of all flags.
+)");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_version) {
+ absl::SetFlag(&FLAGS_version, true);
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf), 0);
+#ifndef NDEBUG
+ EXPECT_EQ(test_buf.str(),
+ "usage_test\nDebug build (NDEBUG not #defined)\n");
+#else
+ EXPECT_EQ(test_buf.str(), "usage_test\n");
+#endif
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_only_check_args) {
+ absl::SetFlag(&FLAGS_only_check_args, true);
+
+ std::stringstream test_buf;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf), 0);
+ EXPECT_EQ(test_buf.str(), "");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(UsageReportingTest, TestUsageFlag_helpon) {
+ absl::SetFlag(&FLAGS_helpon, "bla-bla");
+
+ std::stringstream test_buf_01;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf_01), 1);
+ EXPECT_EQ(test_buf_01.str(),
+ R"(usage_test: Custom usage message
+
+ No modules matched: use -helpfull
+)");
+
+ absl::SetFlag(&FLAGS_helpon, "usage_test");
+
+ std::stringstream test_buf_02;
+ EXPECT_EQ(flags::HandleUsageFlags(test_buf_02), 1);
+ EXPECT_EQ(test_buf_02.str(),
+ R"(usage_test: Custom usage message
+
+ Flags from absl/flags/internal/usage_test.cc:
+ -usage_reporting_test_flag_01 (usage_reporting_test_flag_01 help message);
+ default: 101;
+ -usage_reporting_test_flag_02 (usage_reporting_test_flag_02 help message);
+ default: false;
+ -usage_reporting_test_flag_03 (usage_reporting_test_flag_03 help message);
+ default: 1.03;
+ -usage_reporting_test_flag_04 (usage_reporting_test_flag_04 help message);
+ default: 1000000000000004;
+ -usage_reporting_test_flag_05 (usage_reporting_test_flag_05 help message);
+ default: UDT{};
+)");
+}
+
+// --------------------------------------------------------------------
+
+} // namespace
+
+int main(int argc, char* argv[]) {
+ absl::GetFlag(FLAGS_undefok); // Force linking of parse.cc
+ flags::SetProgramInvocationName("usage_test");
+ flags::SetProgramUsageMessage("Custom usage message");
+ ::testing::InitGoogleTest(&argc, argv);
+
+ return RUN_ALL_TESTS();
+}
diff --git a/absl/flags/marshalling.cc b/absl/flags/marshalling.cc
new file mode 100644
index 0000000..f025ae7
--- /dev/null
+++ b/absl/flags/marshalling.cc
@@ -0,0 +1,189 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/marshalling.h"
+
+#include <limits>
+
+#include "absl/base/macros.h"
+#include "absl/strings/match.h"
+#include "absl/strings/numbers.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/str_format.h"
+#include "absl/strings/str_join.h"
+#include "absl/strings/str_split.h"
+
+namespace absl {
+namespace flags_internal {
+
+// --------------------------------------------------------------------
+// AbslParseFlag specializations for boolean type.
+
+bool AbslParseFlag(absl::string_view text, bool* dst, std::string*) {
+ const char* kTrue[] = {"1", "t", "true", "y", "yes"};
+ const char* kFalse[] = {"0", "f", "false", "n", "no"};
+ static_assert(sizeof(kTrue) == sizeof(kFalse), "true_false_equal");
+
+ text = absl::StripAsciiWhitespace(text);
+
+ for (size_t i = 0; i < ABSL_ARRAYSIZE(kTrue); ++i) {
+ if (absl::EqualsIgnoreCase(text, kTrue[i])) {
+ *dst = true;
+ return true;
+ } else if (absl::EqualsIgnoreCase(text, kFalse[i])) {
+ *dst = false;
+ return true;
+ }
+ }
+ return false; // didn't match a legal input
+}
+
+// --------------------------------------------------------------------
+// AbslParseFlag for integral types.
+
+// Return the base to use for parsing text as an integer. Leading 0x
+// puts us in base 16. But leading 0 does not put us in base 8. It
+// caused too many bugs when we had that behavior.
+static int NumericBase(absl::string_view text) {
+ const bool hex = (text.size() >= 2 && text[0] == '0' &&
+ (text[1] == 'x' || text[1] == 'X'));
+ return hex ? 16 : 10;
+}
+
+template <typename IntType>
+inline bool ParseFlagImpl(absl::string_view text, IntType* dst) {
+ text = absl::StripAsciiWhitespace(text);
+
+ return absl::numbers_internal::safe_strtoi_base(text, dst, NumericBase(text));
+}
+
+bool AbslParseFlag(absl::string_view text, short* dst, std::string*) {
+ int val;
+ if (!ParseFlagImpl(text, &val)) return false;
+ if (static_cast<short>(val) != val) // worked, but number out of range
+ return false;
+ *dst = static_cast<short>(val);
+ return true;
+}
+
+bool AbslParseFlag(absl::string_view text, unsigned short* dst, std::string*) {
+ unsigned int val;
+ if (!ParseFlagImpl(text, &val)) return false;
+ if (static_cast<unsigned short>(val) !=
+ val) // worked, but number out of range
+ return false;
+ *dst = static_cast<unsigned short>(val);
+ return true;
+}
+
+bool AbslParseFlag(absl::string_view text, int* dst, std::string*) {
+ return ParseFlagImpl(text, dst);
+}
+
+bool AbslParseFlag(absl::string_view text, unsigned int* dst, std::string*) {
+ return ParseFlagImpl(text, dst);
+}
+
+bool AbslParseFlag(absl::string_view text, long* dst, std::string*) {
+ return ParseFlagImpl(text, dst);
+}
+
+bool AbslParseFlag(absl::string_view text, unsigned long* dst, std::string*) {
+ return ParseFlagImpl(text, dst);
+}
+
+bool AbslParseFlag(absl::string_view text, long long* dst, std::string*) {
+ return ParseFlagImpl(text, dst);
+}
+
+bool AbslParseFlag(absl::string_view text, unsigned long long* dst,
+ std::string*) {
+ return ParseFlagImpl(text, dst);
+}
+
+// --------------------------------------------------------------------
+// AbslParseFlag for floating point types.
+
+bool AbslParseFlag(absl::string_view text, float* dst, std::string*) {
+ return absl::SimpleAtof(text, dst);
+}
+
+bool AbslParseFlag(absl::string_view text, double* dst, std::string*) {
+ return absl::SimpleAtod(text, dst);
+}
+
+// --------------------------------------------------------------------
+// AbslParseFlag for strings.
+
+bool AbslParseFlag(absl::string_view text, std::string* dst, std::string*) {
+ dst->assign(text.data(), text.size());
+ return true;
+}
+
+// --------------------------------------------------------------------
+// AbslParseFlag for vector of strings.
+
+bool AbslParseFlag(absl::string_view text, std::vector<std::string>* dst,
+ std::string*) {
+ // An empty flag value corresponds to an empty vector, not a vector
+ // with a single, empty std::string.
+ if (text.empty()) {
+ dst->clear();
+ return true;
+ }
+ *dst = absl::StrSplit(text, ',', absl::AllowEmpty());
+ return true;
+}
+
+// --------------------------------------------------------------------
+// AbslUnparseFlag specializations for various builtin flag types.
+
+std::string Unparse(bool v) { return v ? "true" : "false"; }
+std::string Unparse(short v) { return absl::StrCat(v); }
+std::string Unparse(unsigned short v) { return absl::StrCat(v); }
+std::string Unparse(int v) { return absl::StrCat(v); }
+std::string Unparse(unsigned int v) { return absl::StrCat(v); }
+std::string Unparse(long v) { return absl::StrCat(v); }
+std::string Unparse(unsigned long v) { return absl::StrCat(v); }
+std::string Unparse(long long v) { return absl::StrCat(v); }
+std::string Unparse(unsigned long long v) { return absl::StrCat(v); }
+template <typename T>
+std::string UnparseFloatingPointVal(T v) {
+ // digits10 is guaranteed to roundtrip correctly in std::string -> value -> std::string
+ // conversions, but may not be enough to represent all the values correctly.
+ std::string digit10_str =
+ absl::StrFormat("%.*g", std::numeric_limits<T>::digits10, v);
+ if (std::isnan(v) || std::isinf(v)) return digit10_str;
+
+ T roundtrip_val = 0;
+ std::string err;
+ if (absl::ParseFlag(digit10_str, &roundtrip_val, &err) &&
+ roundtrip_val == v) {
+ return digit10_str;
+ }
+
+ // max_digits10 is the number of base-10 digits that are necessary to uniquely
+ // represent all distinct values.
+ return absl::StrFormat("%.*g", std::numeric_limits<T>::max_digits10, v);
+}
+std::string Unparse(float v) { return UnparseFloatingPointVal(v); }
+std::string Unparse(double v) { return UnparseFloatingPointVal(v); }
+std::string AbslUnparseFlag(absl::string_view v) { return std::string(v); }
+std::string AbslUnparseFlag(const std::vector<std::string>& v) {
+ return absl::StrJoin(v, ",");
+}
+
+} // namespace flags_internal
+} // namespace absl
diff --git a/absl/flags/marshalling.h b/absl/flags/marshalling.h
new file mode 100644
index 0000000..669cf45
--- /dev/null
+++ b/absl/flags/marshalling.h
@@ -0,0 +1,260 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: marshalling.h
+// -----------------------------------------------------------------------------
+//
+// This header file defines the API for extending Abseil flag support to
+// custom types, and defines the set of overloads for fundamental types.
+//
+// Out of the box, the Abseil flags library supports the following types:
+//
+// * `bool`
+// * `int16_t`
+// * `uint16_t`
+// * `int32_t`
+// * `uint32_t`
+// * `int64_t`
+// * `uint64_t`
+// * `float`
+// * `double`
+// * `std::string`
+// * `std::vector<std::string>`
+//
+// Note that support for integral types is implemented using overloads for
+// variable-width fundamental types (`short`, `int`, `long`, etc.). However,
+// you should prefer the fixed-width integral types (`int32_t`, `uint64_t`,
+// etc.) we've noted above within flag definitions.
+
+//
+// In addition, several Abseil libraries provide their own custom support for
+// Abseil flags.
+//
+// The Abseil time library provides the following support for civil time values:
+//
+// * `absl::CivilSecond`
+// * `absl::CivilMinute`
+// * `absl::CivilHour`
+// * `absl::CivilDay`
+// * `absl::CivilMonth`
+// * `absl::CivilYear`
+//
+// and also provides support for the following absolute time values:
+//
+// * `absl::Duration`
+// * `absl::Time`
+//
+// Additional support for Abseil types will be noted here as it is added.
+//
+// You can also provide your own custom flags by adding overloads for
+// `AbslParseFlag()` and `AbslUnparseFlag()` to your type definitions. (See
+// below.)
+//
+// -----------------------------------------------------------------------------
+// Adding Type Support for Abseil Flags
+// -----------------------------------------------------------------------------
+//
+// To add support for your user-defined type, add overloads of `AbslParseFlag()`
+// and `AbslUnparseFlag()` as free (non-member) functions to your type. If `T`
+// is a class type, these functions can be friend function definitions. These
+// overloads must be added to the same namespace where the type is defined, so
+// that they can be discovered by Argument-Dependent Lookup (ADL).
+//
+// Example:
+//
+// namespace foo {
+//
+// enum OutputMode { kPlainText, kHtml };
+//
+// // AbslParseFlag converts from a string to OutputMode.
+// // Must be in same namespace as OutputMode.
+//
+// // Parses an OutputMode from the command line flag value `text. Returns
+// // `true` and sets `*mode` on success; returns `false` and sets `*error`
+// // on failure.
+// bool AbslParseFlag(absl::string_view text,
+// OutputMode* mode,
+// std::string* error) {
+// if (text == "plaintext") {
+// *mode = kPlainText;
+// return true;
+// }
+// if (text == "html") {
+// *mode = kHtml;
+// return true;
+// }
+// *error = "unknown value for enumeration";
+// return false;
+// }
+//
+// // AbslUnparseFlag converts from an OutputMode to a string.
+// // Must be in same namespace as OutputMode.
+//
+// // Returns a textual flag value corresponding to the OutputMode `mode`.
+// std::string AbslUnparseFlag(OutputMode mode) {
+// switch (mode) {
+// case kPlainText: return "plaintext";
+// case kHtml: return "html";
+// default: return SimpleItoa(mode);
+// }
+// }
+//
+// Notice that neither `AbslParseFlag()` nor `AbslUnparseFlag()` are class
+// members, but free functions. `AbslParseFlag/AbslUnparseFlag()` overloads
+// for a type should only be declared in the same file and namespace as said
+// type. The proper `AbslParseFlag/AbslUnparseFlag()` implementations for a
+// given type will be discovered via Argument-Dependent Lookup (ADL).
+//
+// `AbslParseFlag()` may need, in turn, to parse simpler constituent types
+// using `absl::ParseFlag()`. For example, a custom struct `MyFlagType`
+// consisting of a `std::pair<int, std::string>` would add an `AbslParseFlag()`
+// overload for its `MyFlagType` like so:
+//
+// Example:
+//
+// namespace my_flag_type {
+//
+// struct MyFlagType {
+// std::pair<int, std::string> my_flag_data;
+// };
+//
+// bool AbslParseFlag(absl::string_view text, MyFlagType* flag,
+// std::string* err);
+//
+// std::string AbslUnparseFlag(const MyFlagType&);
+//
+// // Within the implementation, `AbslParseFlag()` will, in turn invoke
+// // `absl::ParseFlag()` on its constituent `int` and `std::string` types
+// // (which have built-in Abseil flag support.
+//
+// bool AbslParseFlag(absl::string_view text, MyFlagType* flag,
+// std::string* err) {
+// std::pair<absl::string_view, absl::string_view> tokens =
+// absl::StrSplit(text, ',');
+// if (!absl::ParseFlag(tokens.first, &flag->my_flag_data.first, err))
+// return false;
+// if (!absl::ParseFlag(tokens.second, &flag->my_flag_data.second, err))
+// return false;
+// return true;
+// }
+//
+// // Similarly, for unparsing, we can simply invoke `absl::UnparseFlag()` on
+// // the constituent types.
+// std::string AbslUnparseFlag(const MyFlagType& flag) {
+// return absl::StrCat(absl::UnparseFlag(flag.my_flag_data.first),
+// ",",
+// absl::UnparseFlag(flag.my_flag_data.second));
+// }
+#ifndef ABSL_FLAGS_MARSHALLING_H_
+#define ABSL_FLAGS_MARSHALLING_H_
+
+#include <string>
+#include <vector>
+
+#include "absl/strings/string_view.h"
+
+namespace absl {
+namespace flags_internal {
+
+// Overloads of `AbslParseFlag()` and `AbslUnparseFlag()` for fundamental types.
+bool AbslParseFlag(absl::string_view, bool*, std::string*);
+bool AbslParseFlag(absl::string_view, short*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, unsigned short*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, int*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, unsigned int*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, long*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, unsigned long*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, long long*, std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, unsigned long long*,
+ std::string*); // NOLINT
+bool AbslParseFlag(absl::string_view, float*, std::string*);
+bool AbslParseFlag(absl::string_view, double*, std::string*);
+bool AbslParseFlag(absl::string_view, std::string*, std::string*);
+bool AbslParseFlag(absl::string_view, std::vector<std::string>*, std::string*);
+
+struct GlobalStringADLGuard {
+ explicit GlobalStringADLGuard(std::string* p) : ptr(p) {}
+ operator std::string*() { return ptr; } // NOLINT
+ std::string* ptr;
+};
+
+template <typename T>
+bool InvokeParseFlag(absl::string_view input, T* dst, std::string* err) {
+ // Comment on next line provides a good compiler error message if T
+ // does not have AbslParseFlag(absl::string_view, T*, std::string*).
+ return AbslParseFlag( // Is T missing AbslParseFlag?
+ input, dst, GlobalStringADLGuard(err));
+}
+
+// Strings and std:: containers do not have the same overload resolution
+// considerations as fundamental types. Naming these 'AbslUnparseFlag' means we
+// can avoid the need for additional specializations of Unparse (below).
+std::string AbslUnparseFlag(absl::string_view v);
+std::string AbslUnparseFlag(const std::vector<std::string>&);
+
+template <typename T>
+std::string Unparse(const T& v) {
+ // Comment on next line provides a good compiler error message if T does not
+ // have UnparseFlag.
+ return AbslUnparseFlag(v); // Is T missing AbslUnparseFlag?
+}
+
+// Overloads for builtin types.
+std::string Unparse(bool v);
+std::string Unparse(short v); // NOLINT
+std::string Unparse(unsigned short v); // NOLINT
+std::string Unparse(int v); // NOLINT
+std::string Unparse(unsigned int v); // NOLINT
+std::string Unparse(long v); // NOLINT
+std::string Unparse(unsigned long v); // NOLINT
+std::string Unparse(long long v); // NOLINT
+std::string Unparse(unsigned long long v); // NOLINT
+std::string Unparse(float v);
+std::string Unparse(double v);
+
+} // namespace flags_internal
+
+// ParseFlag()
+//
+// Parses a string value into a flag value of type `T`. Do not add overloads of
+// this function for your type directly; instead, add an `AbslParseFlag()`
+// free function as documented above.
+//
+// Some implementations of `AbslParseFlag()` for types which consist of other,
+// constituent types which already have Abseil flag support, may need to call
+// `absl::ParseFlag()` on those consituent string values. (See above.)
+template <typename T>
+inline bool ParseFlag(absl::string_view input, T* dst, std::string* error) {
+ return flags_internal::InvokeParseFlag(input, dst, error);
+}
+
+// UnparseFlag()
+//
+// Unparses a flag value of type `T` into a string value. Do not add overloads
+// of this function for your type directly; instead, add an `AbslUnparseFlag()`
+// free function as documented above.
+//
+// Some implementations of `AbslUnparseFlag()` for types which consist of other,
+// constituent types which already have Abseil flag support, may want to call
+// `absl::UnparseFlag()` on those constituent types. (See above.)
+template <typename T>
+inline std::string UnparseFlag(const T& v) {
+ return flags_internal::Unparse(v);
+}
+
+} // namespace absl
+
+#endif // ABSL_FLAGS_MARSHALLING_H_
diff --git a/absl/flags/marshalling_test.cc b/absl/flags/marshalling_test.cc
new file mode 100644
index 0000000..37cd194
--- /dev/null
+++ b/absl/flags/marshalling_test.cc
@@ -0,0 +1,899 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/marshalling.h"
+
+#include <cmath>
+
+#include "gtest/gtest.h"
+
+namespace {
+
+TEST(MarshallingTest, TestBoolParsing) {
+ std::string err;
+ bool value;
+
+ // True values.
+ EXPECT_TRUE(absl::ParseFlag("True", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("true", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("TRUE", &value, &err));
+ EXPECT_TRUE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("Yes", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("yes", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("YES", &value, &err));
+ EXPECT_TRUE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("t", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("T", &value, &err));
+ EXPECT_TRUE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("y", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("Y", &value, &err));
+ EXPECT_TRUE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_TRUE(value);
+
+ // False values.
+ EXPECT_TRUE(absl::ParseFlag("False", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("false", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("FALSE", &value, &err));
+ EXPECT_FALSE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("No", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("no", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("NO", &value, &err));
+ EXPECT_FALSE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("f", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("F", &value, &err));
+ EXPECT_FALSE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("n", &value, &err));
+ EXPECT_FALSE(value);
+ EXPECT_TRUE(absl::ParseFlag("N", &value, &err));
+ EXPECT_FALSE(value);
+
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_FALSE(value);
+
+ // Whitespace handling.
+ EXPECT_TRUE(absl::ParseFlag(" true", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag("true ", &value, &err));
+ EXPECT_TRUE(value);
+ EXPECT_TRUE(absl::ParseFlag(" true ", &value, &err));
+ EXPECT_TRUE(value);
+
+ // Invalid input.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("11", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("tt", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt16Parsing) {
+ std::string err;
+ int16_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_EQ(value, -1);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("-18765", &value, &err));
+ EXPECT_EQ(value, -18765);
+ EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
+ EXPECT_EQ(value, 3);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("-001", &value, &err));
+ EXPECT_EQ(value, -1);
+ EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
+ EXPECT_EQ(value, 100);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
+ EXPECT_EQ(value, 564);
+ // TODO(rogeeff): fix below validations
+ EXPECT_FALSE(absl::ParseFlag("-0x7FFD", &value, &err));
+ EXPECT_NE(value, -3);
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+ EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
+ EXPECT_EQ(value, 34);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("40000", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUint16Parsing) {
+ std::string err;
+ uint16_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
+ EXPECT_EQ(value, 3);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
+ EXPECT_EQ(value, 100);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
+ EXPECT_EQ(value, 564);
+ // TODO(rogeeff): fix below validations
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+ EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
+ EXPECT_EQ(value, 34);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("70000", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt32Parsing) {
+ std::string err;
+ int32_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_EQ(value, -1);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("-98765", &value, &err));
+ EXPECT_EQ(value, -98765);
+ EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
+ EXPECT_EQ(value, 3);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("-001", &value, &err));
+ EXPECT_EQ(value, -1);
+ EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
+ EXPECT_EQ(value, 100);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
+ EXPECT_EQ(value, 564);
+ // TODO(rogeeff): fix below validations
+ EXPECT_FALSE(absl::ParseFlag("-0x7FFFFFFD", &value, &err));
+ EXPECT_NE(value, -3);
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+ EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
+ EXPECT_EQ(value, 34);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("70000000000", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUint32Parsing) {
+ std::string err;
+ uint32_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
+ EXPECT_EQ(value, 3);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
+ EXPECT_EQ(value, 100);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0X234", &value, &err));
+ EXPECT_EQ(value, 564);
+ EXPECT_TRUE(absl::ParseFlag("0xFFFFFFFD", &value, &err));
+ EXPECT_EQ(value, 4294967293);
+ // TODO(rogeeff): fix below validations
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+ EXPECT_TRUE(absl::ParseFlag(" 0x22 ", &value, &err));
+ EXPECT_EQ(value, 34);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("140000000000", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt64Parsing) {
+ std::string err;
+ int64_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_EQ(value, -1);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("-98765", &value, &err));
+ EXPECT_EQ(value, -98765);
+ EXPECT_TRUE(absl::ParseFlag("+3", &value, &err));
+ EXPECT_EQ(value, 3);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0000100", &value, &err));
+ EXPECT_EQ(value, 100);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0XFFFAAABBBCCCDDD", &value, &err));
+ EXPECT_EQ(value, 1152827684197027293);
+ // TODO(rogeeff): fix below validation
+ EXPECT_FALSE(absl::ParseFlag("-0x7FFFFFFFFFFFFFFE", &value, &err));
+ EXPECT_NE(value, -2);
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+ EXPECT_TRUE(absl::ParseFlag(" 0x7F ", &value, &err));
+ EXPECT_EQ(value, 127);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("0xFFFFFFFFFFFFFFFFFF", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUInt64Parsing) {
+ std::string err;
+ uint64_t value;
+
+ // Decimal values.
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0", &value, &err));
+ EXPECT_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("123", &value, &err));
+ EXPECT_EQ(value, 123);
+ EXPECT_TRUE(absl::ParseFlag("+13", &value, &err));
+ EXPECT_EQ(value, 13);
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("001", &value, &err));
+ EXPECT_EQ(value, 1);
+ EXPECT_TRUE(absl::ParseFlag("0000300", &value, &err));
+ EXPECT_EQ(value, 300);
+
+ // Hex values.
+ EXPECT_TRUE(absl::ParseFlag("0x10", &value, &err));
+ EXPECT_EQ(value, 16);
+ EXPECT_TRUE(absl::ParseFlag("0XFFFF", &value, &err));
+ EXPECT_EQ(value, 65535);
+ // TODO(rogeeff): fix below validation
+ EXPECT_FALSE(absl::ParseFlag("+0x31", &value, &err));
+ EXPECT_NE(value, 49);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10 ", &value, &err));
+ EXPECT_EQ(value, 10);
+ EXPECT_TRUE(absl::ParseFlag(" 11", &value, &err));
+ EXPECT_EQ(value, 11);
+ EXPECT_TRUE(absl::ParseFlag(" 012 ", &value, &err));
+ EXPECT_EQ(value, 12);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("0xFFFFFFFFFFFFFFFFFF", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("-1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2U", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("FFF", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestFloatParsing) {
+ std::string err;
+ float value;
+
+ // Ordinary values.
+ EXPECT_TRUE(absl::ParseFlag("1.3", &value, &err));
+ EXPECT_FLOAT_EQ(value, 1.3f);
+ EXPECT_TRUE(absl::ParseFlag("-0.1", &value, &err));
+ EXPECT_DOUBLE_EQ(value, -0.1f);
+ EXPECT_TRUE(absl::ParseFlag("+0.01", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.01f);
+
+ // Scientific values.
+ EXPECT_TRUE(absl::ParseFlag("1.2e3", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 1.2e3f);
+ EXPECT_TRUE(absl::ParseFlag("9.8765402e-37", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 9.8765402e-37f);
+ EXPECT_TRUE(absl::ParseFlag("0.11e+3", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.11e+3f);
+ EXPECT_TRUE(absl::ParseFlag("1.e-2300", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.f);
+ EXPECT_TRUE(absl::ParseFlag("1.e+2300", &value, &err));
+ EXPECT_TRUE(std::isinf(value));
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01.6", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 1.6f);
+ EXPECT_TRUE(absl::ParseFlag("000.0001", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.0001f);
+
+ // Trailing zero values.
+ EXPECT_TRUE(absl::ParseFlag("-5.1000", &value, &err));
+ EXPECT_DOUBLE_EQ(value, -5.1f);
+
+ // Exceptional values.
+ EXPECT_TRUE(absl::ParseFlag("NaN", &value, &err));
+ EXPECT_TRUE(std::isnan(value));
+ EXPECT_TRUE(absl::ParseFlag("Inf", &value, &err));
+ EXPECT_TRUE(std::isinf(value));
+
+ // Hex values
+ EXPECT_TRUE(absl::ParseFlag("0x10.23p12", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 66096.f);
+ EXPECT_TRUE(absl::ParseFlag("-0xF1.A3p-2", &value, &err));
+ EXPECT_NEAR(value, -60.4092f, 5e-5f);
+ EXPECT_TRUE(absl::ParseFlag("+0x0.0AAp-12", &value, &err));
+ EXPECT_NEAR(value, 1.01328e-05f, 5e-11f);
+ EXPECT_TRUE(absl::ParseFlag("0x.01p1", &value, &err));
+ EXPECT_NEAR(value, 0.0078125f, 5e-8f);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10.1 ", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 10.1f);
+ EXPECT_TRUE(absl::ParseFlag(" 2.34", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 2.34f);
+ EXPECT_TRUE(absl::ParseFlag(" 5.7 ", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 5.7f);
+ EXPECT_TRUE(absl::ParseFlag(" -0xE0.F3p01 ", &value, &err));
+ EXPECT_NEAR(value, -449.8984375f, 5e-8f);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2.3xxx", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("0x0.1pAA", &value, &err));
+ // TODO(rogeeff): below assertion should fail
+ EXPECT_TRUE(absl::ParseFlag("0x0.1", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestDoubleParsing) {
+ std::string err;
+ double value;
+
+ // Ordinary values.
+ EXPECT_TRUE(absl::ParseFlag("1.3", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 1.3);
+ EXPECT_TRUE(absl::ParseFlag("-0.1", &value, &err));
+ EXPECT_DOUBLE_EQ(value, -0.1);
+ EXPECT_TRUE(absl::ParseFlag("+0.01", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.01);
+
+ // Scientific values.
+ EXPECT_TRUE(absl::ParseFlag("1.2e3", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 1.2e3);
+ EXPECT_TRUE(absl::ParseFlag("9.00000002e-123", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 9.00000002e-123);
+ EXPECT_TRUE(absl::ParseFlag("0.11e+3", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.11e+3);
+ EXPECT_TRUE(absl::ParseFlag("1.e-2300", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0);
+ EXPECT_TRUE(absl::ParseFlag("1.e+2300", &value, &err));
+ EXPECT_TRUE(std::isinf(value));
+
+ // Leading zero values.
+ EXPECT_TRUE(absl::ParseFlag("01.6", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 1.6);
+ EXPECT_TRUE(absl::ParseFlag("000.0001", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 0.0001);
+
+ // Trailing zero values.
+ EXPECT_TRUE(absl::ParseFlag("-5.1000", &value, &err));
+ EXPECT_DOUBLE_EQ(value, -5.1);
+
+ // Exceptional values.
+ EXPECT_TRUE(absl::ParseFlag("NaN", &value, &err));
+ EXPECT_TRUE(std::isnan(value));
+ EXPECT_TRUE(absl::ParseFlag("nan", &value, &err));
+ EXPECT_TRUE(std::isnan(value));
+ EXPECT_TRUE(absl::ParseFlag("Inf", &value, &err));
+ EXPECT_TRUE(std::isinf(value));
+ EXPECT_TRUE(absl::ParseFlag("inf", &value, &err));
+ EXPECT_TRUE(std::isinf(value));
+
+ // Hex values
+ EXPECT_TRUE(absl::ParseFlag("0x10.23p12", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 66096);
+ EXPECT_TRUE(absl::ParseFlag("-0xF1.A3p-2", &value, &err));
+ EXPECT_NEAR(value, -60.4092, 5e-5);
+ EXPECT_TRUE(absl::ParseFlag("+0x0.0AAp-12", &value, &err));
+ EXPECT_NEAR(value, 1.01328e-05, 5e-11);
+ EXPECT_TRUE(absl::ParseFlag("0x.01p1", &value, &err));
+ EXPECT_NEAR(value, 0.0078125, 5e-8);
+
+ // Whitespace handling
+ EXPECT_TRUE(absl::ParseFlag("10.1 ", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 10.1);
+ EXPECT_TRUE(absl::ParseFlag(" 2.34", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 2.34);
+ EXPECT_TRUE(absl::ParseFlag(" 5.7 ", &value, &err));
+ EXPECT_DOUBLE_EQ(value, 5.7);
+ EXPECT_TRUE(absl::ParseFlag(" -0xE0.F3p01 ", &value, &err));
+ EXPECT_NEAR(value, -449.8984375, 5e-8);
+
+ // Invalid values.
+ EXPECT_FALSE(absl::ParseFlag("", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("--1", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("2.3xxx", &value, &err));
+ EXPECT_FALSE(absl::ParseFlag("0x0.1pAA", &value, &err));
+ // TODO(rogeeff): below assertion should fail
+ EXPECT_TRUE(absl::ParseFlag("0x0.1", &value, &err));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestStringParsing) {
+ std::string err;
+ std::string value;
+
+ EXPECT_TRUE(absl::ParseFlag("", &value, &err));
+ EXPECT_EQ(value, "");
+ EXPECT_TRUE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_EQ(value, " ");
+ EXPECT_TRUE(absl::ParseFlag(" ", &value, &err));
+ EXPECT_EQ(value, " ");
+ EXPECT_TRUE(absl::ParseFlag("\n", &value, &err));
+ EXPECT_EQ(value, "\n");
+ EXPECT_TRUE(absl::ParseFlag("\t", &value, &err));
+ EXPECT_EQ(value, "\t");
+ EXPECT_TRUE(absl::ParseFlag("asdfg", &value, &err));
+ EXPECT_EQ(value, "asdfg");
+ EXPECT_TRUE(absl::ParseFlag("asdf ghjk", &value, &err));
+ EXPECT_EQ(value, "asdf ghjk");
+ EXPECT_TRUE(absl::ParseFlag("a\nb\nc", &value, &err));
+ EXPECT_EQ(value, "a\nb\nc");
+ EXPECT_TRUE(absl::ParseFlag("asd\0fgh", &value, &err));
+ EXPECT_EQ(value, "asd");
+ EXPECT_TRUE(absl::ParseFlag("\\\\", &value, &err));
+ EXPECT_EQ(value, "\\\\");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestVectorOfStringParsing) {
+ std::string err;
+ std::vector<std::string> value;
+
+ EXPECT_TRUE(absl::ParseFlag("", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>{});
+ EXPECT_TRUE(absl::ParseFlag("1", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"1"}));
+ EXPECT_TRUE(absl::ParseFlag("a,b", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"a", "b"}));
+ EXPECT_TRUE(absl::ParseFlag("a,b,c,", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"a", "b", "c", ""}));
+ EXPECT_TRUE(absl::ParseFlag("a,,", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"a", "", ""}));
+ EXPECT_TRUE(absl::ParseFlag(",", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"", ""}));
+ EXPECT_TRUE(absl::ParseFlag("a, b,c ", &value, &err));
+ EXPECT_EQ(value, std::vector<std::string>({"a", " b", "c "}));
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestBoolUnparsing) {
+ EXPECT_EQ(absl::UnparseFlag(true), "true");
+ EXPECT_EQ(absl::UnparseFlag(false), "false");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt16Unparsing) {
+ int16_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = -1;
+ EXPECT_EQ(absl::UnparseFlag(value), "-1");
+ value = 9876;
+ EXPECT_EQ(absl::UnparseFlag(value), "9876");
+ value = -987;
+ EXPECT_EQ(absl::UnparseFlag(value), "-987");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUint16Unparsing) {
+ uint16_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = 19876;
+ EXPECT_EQ(absl::UnparseFlag(value), "19876");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt32Unparsing) {
+ int32_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = -1;
+ EXPECT_EQ(absl::UnparseFlag(value), "-1");
+ value = 12345;
+ EXPECT_EQ(absl::UnparseFlag(value), "12345");
+ value = -987;
+ EXPECT_EQ(absl::UnparseFlag(value), "-987");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUint32Unparsing) {
+ uint32_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = 1234500;
+ EXPECT_EQ(absl::UnparseFlag(value), "1234500");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestInt64Unparsing) {
+ int64_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = -1;
+ EXPECT_EQ(absl::UnparseFlag(value), "-1");
+ value = 123456789L;
+ EXPECT_EQ(absl::UnparseFlag(value), "123456789");
+ value = -987654321L;
+ EXPECT_EQ(absl::UnparseFlag(value), "-987654321");
+ value = 0x7FFFFFFFFFFFFFFF;
+ EXPECT_EQ(absl::UnparseFlag(value), "9223372036854775807");
+ value = 0xFFFFFFFFFFFFFFFF;
+ EXPECT_EQ(absl::UnparseFlag(value), "-1");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestUint64Unparsing) {
+ uint64_t value;
+
+ value = 1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1");
+ value = 0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = 123456789L;
+ EXPECT_EQ(absl::UnparseFlag(value), "123456789");
+ value = 0xFFFFFFFFFFFFFFFF;
+ EXPECT_EQ(absl::UnparseFlag(value), "18446744073709551615");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestFloatUnparsing) {
+ float value;
+
+ value = 1.1f;
+ EXPECT_EQ(absl::UnparseFlag(value), "1.1");
+ value = 0.01f;
+ EXPECT_EQ(absl::UnparseFlag(value), "0.01");
+ value = 1.23e-2f;
+ EXPECT_EQ(absl::UnparseFlag(value), "0.0123");
+ value = -0.71f;
+ EXPECT_EQ(absl::UnparseFlag(value), "-0.71");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestDoubleUnparsing) {
+ double value;
+
+ value = 1.1;
+ EXPECT_EQ(absl::UnparseFlag(value), "1.1");
+ value = 0.01;
+ EXPECT_EQ(absl::UnparseFlag(value), "0.01");
+ value = 1.23e-2;
+ EXPECT_EQ(absl::UnparseFlag(value), "0.0123");
+ value = -0.71;
+ EXPECT_EQ(absl::UnparseFlag(value), "-0.71");
+ value = -0;
+ EXPECT_EQ(absl::UnparseFlag(value), "0");
+ value = std::nan("");
+ EXPECT_EQ(absl::UnparseFlag(value), "nan");
+ value = std::numeric_limits<double>::infinity();
+ EXPECT_EQ(absl::UnparseFlag(value), "inf");
+}
+
+// --------------------------------------------------------------------
+
+TEST(MarshallingTest, TestStringUnparsing) {
+ EXPECT_EQ(absl::UnparseFlag(""), "");
+ EXPECT_EQ(absl::UnparseFlag(" "), " ");
+ EXPECT_EQ(absl::UnparseFlag("qwerty"), "qwerty");
+ EXPECT_EQ(absl::UnparseFlag("ASDFGH"), "ASDFGH");
+ EXPECT_EQ(absl::UnparseFlag("\n\t "), "\n\t ");
+}
+
+// --------------------------------------------------------------------
+
+template <typename T>
+void TestRoundtrip(T v) {
+ T new_v;
+ std::string err;
+ EXPECT_TRUE(absl::ParseFlag(absl::UnparseFlag(v), &new_v, &err));
+ EXPECT_EQ(new_v, v);
+}
+
+TEST(MarshallingTest, TestFloatRoundTrip) {
+ TestRoundtrip(0.1f);
+ TestRoundtrip(0.12f);
+ TestRoundtrip(0.123f);
+ TestRoundtrip(0.1234f);
+ TestRoundtrip(0.12345f);
+ TestRoundtrip(0.123456f);
+ TestRoundtrip(0.1234567f);
+ TestRoundtrip(0.12345678f);
+
+ TestRoundtrip(0.1e20f);
+ TestRoundtrip(0.12e20f);
+ TestRoundtrip(0.123e20f);
+ TestRoundtrip(0.1234e20f);
+ TestRoundtrip(0.12345e20f);
+ TestRoundtrip(0.123456e20f);
+ TestRoundtrip(0.1234567e20f);
+ TestRoundtrip(0.12345678e20f);
+
+ TestRoundtrip(0.1e-20f);
+ TestRoundtrip(0.12e-20f);
+ TestRoundtrip(0.123e-20f);
+ TestRoundtrip(0.1234e-20f);
+ TestRoundtrip(0.12345e-20f);
+ TestRoundtrip(0.123456e-20f);
+ TestRoundtrip(0.1234567e-20f);
+ TestRoundtrip(0.12345678e-20f);
+}
+
+TEST(MarshallingTest, TestDoubleRoundTrip) {
+ TestRoundtrip(0.1);
+ TestRoundtrip(0.12);
+ TestRoundtrip(0.123);
+ TestRoundtrip(0.1234);
+ TestRoundtrip(0.12345);
+ TestRoundtrip(0.123456);
+ TestRoundtrip(0.1234567);
+ TestRoundtrip(0.12345678);
+ TestRoundtrip(0.123456789);
+ TestRoundtrip(0.1234567891);
+ TestRoundtrip(0.12345678912);
+ TestRoundtrip(0.123456789123);
+ TestRoundtrip(0.1234567891234);
+ TestRoundtrip(0.12345678912345);
+ TestRoundtrip(0.123456789123456);
+ TestRoundtrip(0.1234567891234567);
+ TestRoundtrip(0.12345678912345678);
+
+ TestRoundtrip(0.1e50);
+ TestRoundtrip(0.12e50);
+ TestRoundtrip(0.123e50);
+ TestRoundtrip(0.1234e50);
+ TestRoundtrip(0.12345e50);
+ TestRoundtrip(0.123456e50);
+ TestRoundtrip(0.1234567e50);
+ TestRoundtrip(0.12345678e50);
+ TestRoundtrip(0.123456789e50);
+ TestRoundtrip(0.1234567891e50);
+ TestRoundtrip(0.12345678912e50);
+ TestRoundtrip(0.123456789123e50);
+ TestRoundtrip(0.1234567891234e50);
+ TestRoundtrip(0.12345678912345e50);
+ TestRoundtrip(0.123456789123456e50);
+ TestRoundtrip(0.1234567891234567e50);
+ TestRoundtrip(0.12345678912345678e50);
+
+ TestRoundtrip(0.1e-50);
+ TestRoundtrip(0.12e-50);
+ TestRoundtrip(0.123e-50);
+ TestRoundtrip(0.1234e-50);
+ TestRoundtrip(0.12345e-50);
+ TestRoundtrip(0.123456e-50);
+ TestRoundtrip(0.1234567e-50);
+ TestRoundtrip(0.12345678e-50);
+ TestRoundtrip(0.123456789e-50);
+ TestRoundtrip(0.1234567891e-50);
+ TestRoundtrip(0.12345678912e-50);
+ TestRoundtrip(0.123456789123e-50);
+ TestRoundtrip(0.1234567891234e-50);
+ TestRoundtrip(0.12345678912345e-50);
+ TestRoundtrip(0.123456789123456e-50);
+ TestRoundtrip(0.1234567891234567e-50);
+ TestRoundtrip(0.12345678912345678e-50);
+}
+
+} // namespace
diff --git a/absl/flags/parse.cc b/absl/flags/parse.cc
new file mode 100644
index 0000000..b196196
--- /dev/null
+++ b/absl/flags/parse.cc
@@ -0,0 +1,762 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/parse.h"
+
+#include <stdlib.h>
+#include <fstream>
+#include <iostream>
+#include <tuple>
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+#include "absl/flags/flag.h"
+#include "absl/flags/internal/program_name.h"
+#include "absl/flags/internal/registry.h"
+#include "absl/flags/internal/usage.h"
+#include "absl/flags/usage_config.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/strip.h"
+#include "absl/synchronization/mutex.h"
+
+// --------------------------------------------------------------------
+
+namespace absl {
+namespace flags_internal {
+namespace {
+
+ABSL_CONST_INIT absl::Mutex processing_checks_guard(absl::kConstInit);
+
+ABSL_CONST_INIT bool flagfile_needs_processing
+ GUARDED_BY(processing_checks_guard) = false;
+ABSL_CONST_INIT bool fromenv_needs_processing
+ GUARDED_BY(processing_checks_guard) = false;
+ABSL_CONST_INIT bool tryfromenv_needs_processing
+ GUARDED_BY(processing_checks_guard) = false;
+
+} // namespace
+} // namespace flags_internal
+} // namespace absl
+
+ABSL_FLAG(std::vector<std::string>, flagfile, {},
+ "comma-separated list of files to load flags from")
+ .OnUpdate([]() {
+ if (absl::GetFlag(FLAGS_flagfile).empty()) return;
+
+ absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
+
+ // Setting this flag twice before it is handled most likely an internal
+ // error and should be reviewed by developers.
+ if (absl::flags_internal::flagfile_needs_processing) {
+ ABSL_INTERNAL_LOG(WARNING, "flagfile set twice before it is handled");
+ }
+
+ absl::flags_internal::flagfile_needs_processing = true;
+ });
+ABSL_FLAG(std::vector<std::string>, fromenv, {},
+ "comma-separated list of flags to set from the environment"
+ " [use 'export FLAGS_flag1=value']")
+ .OnUpdate([]() {
+ if (absl::GetFlag(FLAGS_fromenv).empty()) return;
+
+ absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
+
+ // Setting this flag twice before it is handled most likely an internal
+ // error and should be reviewed by developers.
+ if (absl::flags_internal::fromenv_needs_processing) {
+ ABSL_INTERNAL_LOG(WARNING, "fromenv set twice before it is handled.");
+ }
+
+ absl::flags_internal::fromenv_needs_processing = true;
+ });
+ABSL_FLAG(std::vector<std::string>, tryfromenv, {},
+ "comma-separated list of flags to try to set from the environment if "
+ "present")
+ .OnUpdate([]() {
+ if (absl::GetFlag(FLAGS_tryfromenv).empty()) return;
+
+ absl::MutexLock l(&absl::flags_internal::processing_checks_guard);
+
+ // Setting this flag twice before it is handled most likely an internal
+ // error and should be reviewed by developers.
+ if (absl::flags_internal::tryfromenv_needs_processing) {
+ ABSL_INTERNAL_LOG(WARNING,
+ "tryfromenv set twice before it is handled.");
+ }
+
+ absl::flags_internal::tryfromenv_needs_processing = true;
+ });
+
+ABSL_FLAG(std::vector<std::string>, undefok, {},
+ "comma-separated list of flag names that it is okay to specify "
+ "on the command line even if the program does not define a flag "
+ "with that name");
+
+namespace absl {
+namespace flags_internal {
+
+namespace {
+
+class ArgsList {
+ public:
+ ArgsList() : next_arg_(0) {}
+ ArgsList(int argc, char* argv[]) : args_(argv, argv + argc), next_arg_(0) {}
+ explicit ArgsList(const std::vector<std::string>& args)
+ : args_(args), next_arg_(0) {}
+
+ // Returns success status: true if parsing successful, false otherwise.
+ bool ReadFromFlagfile(const std::string& flag_file_name);
+
+ int Size() const { return args_.size() - next_arg_; }
+ int FrontIndex() const { return next_arg_; }
+ absl::string_view Front() const { return args_[next_arg_]; }
+ void PopFront() { next_arg_++; }
+
+ private:
+ std::vector<std::string> args_;
+ int next_arg_;
+};
+
+bool ArgsList::ReadFromFlagfile(const std::string& flag_file_name) {
+ std::ifstream flag_file(flag_file_name);
+
+ if (!flag_file) {
+ flags_internal::ReportUsageError(
+ absl::StrCat("Can't open flagfile ", flag_file_name), true);
+
+ return false;
+ }
+
+ // This argument represents fake argv[0], which should be present in all arg
+ // lists.
+ args_.push_back("");
+
+ std::string line;
+ bool success = true;
+
+ while (std::getline(flag_file, line)) {
+ absl::string_view stripped = absl::StripLeadingAsciiWhitespace(line);
+
+ if (stripped.empty() || stripped[0] == '#') {
+ // Comment or empty line; just ignore.
+ continue;
+ }
+
+ if (stripped[0] == '-') {
+ if (stripped == "--") {
+ flags_internal::ReportUsageError(
+ "Flagfile can't contain position arguments or --", true);
+
+ success = false;
+ break;
+ }
+
+ args_.push_back(std::string(stripped));
+ continue;
+ }
+
+ flags_internal::ReportUsageError(
+ absl::StrCat("Unexpected line in the flagfile ", flag_file_name, ": ",
+ line),
+ true);
+
+ success = false;
+ }
+
+ return success;
+}
+
+// --------------------------------------------------------------------
+
+// Reads the environment variable with name `name` and stores results in
+// `value`. If variable is not present in environment returns false, otherwise
+// returns true.
+bool GetEnvVar(const char* var_name, std::string* var_value) {
+#ifdef _WIN32
+ char buf[1024];
+ auto get_res = GetEnvironmentVariableA(var_name, buf, sizeof(buf));
+ if (get_res >= sizeof(buf)) {
+ return "";
+ }
+
+ if (get_res == 0) {
+ return false;
+ }
+
+ *var_value = std::string(buf, get_res);
+#else
+ const char* val = ::getenv(var_name);
+ if (val == nullptr) {
+ return false;
+ }
+
+ *var_value = val;
+#endif
+
+ return true;
+}
+
+// --------------------------------------------------------------------
+
+// Returns:
+// Flag name or empty if arg= --
+// Flag value after = in --flag=value (empty if --foo)
+// "Is empty value" status. True if arg= --foo=, false otherwise. This is
+// required to separate --foo from --foo=.
+// For example:
+// arg return values
+// "--foo=bar" -> {"foo", "bar", false}.
+// "--foo" -> {"foo", "", false}.
+// "--foo=" -> {"foo", "", true}.
+std::tuple<absl::string_view, absl::string_view, bool> SplitNameAndValue(
+ absl::string_view arg) {
+ // Allow -foo and --foo
+ absl::ConsumePrefix(&arg, "-");
+
+ if (arg.empty()) {
+ return std::make_tuple("", "", false);
+ }
+
+ auto equal_sign_pos = arg.find("=");
+
+ absl::string_view flag_name = arg.substr(0, equal_sign_pos);
+
+ absl::string_view value;
+ bool is_empty_value = false;
+
+ if (equal_sign_pos != absl::string_view::npos) {
+ value = arg.substr(equal_sign_pos + 1);
+ is_empty_value = value.empty();
+ }
+
+ return std::make_tuple(flag_name, value, is_empty_value);
+}
+
+// --------------------------------------------------------------------
+
+// Returns:
+// found flag or nullptr
+// is negative in case of --nofoo
+std::tuple<CommandLineFlag*, bool> LocateFlag(absl::string_view flag_name) {
+ CommandLineFlag* flag = flags_internal::FindCommandLineFlag(flag_name);
+ bool is_negative = false;
+
+ if (!flag && absl::ConsumePrefix(&flag_name, "no")) {
+ flag = flags_internal::FindCommandLineFlag(flag_name);
+ is_negative = true;
+ }
+
+ return std::make_tuple(flag, is_negative);
+}
+
+// --------------------------------------------------------------------
+
+// Verify that default values of typed flags must be convertible to string and
+// back.
+void CheckDefaultValuesParsingRoundtrip() {
+#ifndef NDEBUG
+ flags_internal::ForEachFlag([&](CommandLineFlag* flag) {
+ if (flag->IsRetired()) return;
+
+#define IGNORE_TYPE(T) \
+ if (flag->IsOfType<T>()) return;
+
+ ABSL_FLAGS_INTERNAL_FOR_EACH_LOCK_FREE(IGNORE_TYPE)
+ IGNORE_TYPE(std::string)
+ IGNORE_TYPE(std::vector<std::string>)
+#undef IGNORE_TYPE
+
+ absl::MutexLock lock(InitFlagIfNecessary(flag));
+
+ std::string v = flag->DefaultValue();
+ void* dst = Clone(flag->op, flag->def);
+ std::string error;
+ if (!flags_internal::Parse(flag->marshalling_op, v, dst, &error)) {
+ ABSL_INTERNAL_LOG(
+ FATAL,
+ absl::StrCat("Flag ", flag->Name(), " (from ", flag->Filename(),
+ "): std::string form of default value '", v,
+ "' could not be parsed; error=", error));
+ }
+
+ // We do not compare dst to def since parsing/unparsing may make
+ // small changes, e.g., precision loss for floating point types.
+ Delete(flag->op, dst);
+ });
+#endif
+}
+
+// --------------------------------------------------------------------
+
+// Returns success status, which is true if we successfully read all flag files,
+// in which case new ArgLists are appended to the input_args in a reverse order
+// of file names in the input flagfiles list. This order ensures that flags from
+// the first flagfile in the input list are processed before the second flagfile
+// etc.
+bool ReadFlagfiles(const std::vector<std::string>& flagfiles,
+ std::vector<ArgsList>* input_args) {
+ bool success = true;
+ for (auto it = flagfiles.rbegin(); it != flagfiles.rend(); ++it) {
+ ArgsList al;
+
+ if (al.ReadFromFlagfile(*it)) {
+ input_args->push_back(al);
+ } else {
+ success = false;
+ }
+ }
+
+ return success;
+}
+
+// Returns success status, which is true if were able to locate all environment
+// variables correctly or if fail_on_absent_in_env is false. The environment
+// variable names are expected to be of the form `FLAGS_<flag_name>`, where
+// `flag_name` is a string from the input flag_names list. If successful we
+// append a single ArgList at the end of the input_args.
+bool ReadFlagsFromEnv(const std::vector<std::string>& flag_names,
+ std::vector<ArgsList>* input_args,
+ bool fail_on_absent_in_env) {
+ bool success = true;
+ std::vector<std::string> args;
+
+ // This argument represents fake argv[0], which should be present in all arg
+ // lists.
+ args.push_back("");
+
+ for (const auto& flag_name : flag_names) {
+ // Avoid infinite recursion.
+ if (flag_name == "fromenv" || flag_name == "tryfromenv") {
+ flags_internal::ReportUsageError(
+ absl::StrCat("Infinite recursion on flag ", flag_name), true);
+
+ success = false;
+ continue;
+ }
+
+ const std::string envname = absl::StrCat("FLAGS_", flag_name);
+ std::string envval;
+ if (!GetEnvVar(envname.c_str(), &envval)) {
+ if (fail_on_absent_in_env) {
+ flags_internal::ReportUsageError(
+ absl::StrCat(envname, " not found in environment"), true);
+
+ success = false;
+ }
+
+ continue;
+ }
+
+ args.push_back(absl::StrCat("--", flag_name, "=", envval));
+ }
+
+ if (success) {
+ input_args->emplace_back(args);
+ }
+
+ return success;
+}
+
+// --------------------------------------------------------------------
+
+// Returns success status, which is true if were able to handle all generator
+// flags (flagfile, fromenv, tryfromemv) successfully.
+bool HandleGeneratorFlags(std::vector<ArgsList>* input_args,
+ std::vector<std::string>* flagfile_value) {
+ bool success = true;
+
+ absl::MutexLock l(&flags_internal::processing_checks_guard);
+
+ // flagfile could have been set either on a command line or
+ // programmatically before invoking ParseCommandLine. Note that we do not
+ // actually process arguments specified in the flagfile, but instead
+ // create a secondary arguments list to be processed along with the rest
+ // of the comamnd line arguments. Since we always the process most recently
+ // created list of arguments first, this will result in flagfile argument
+ // being processed before any other argument in the command line. If
+ // FLAGS_flagfile contains more than one file name we create multiple new
+ // levels of arguments in a reverse order of file names. Thus we always
+ // process arguments from first file before arguments containing in a
+ // second file, etc. If flagfile contains another
+ // --flagfile inside of it, it will produce new level of arguments and
+ // processed before the rest of the flagfile. We are also collecting all
+ // flagfiles set on original command line. Unlike the rest of the flags,
+ // this flag can be set multiple times and is expected to be handled
+ // multiple times. We are collecting them all into a single list and set
+ // the value of FLAGS_flagfile to that value at the end of the parsing.
+ if (flags_internal::flagfile_needs_processing) {
+ auto flagfiles = absl::GetFlag(FLAGS_flagfile);
+
+ if (input_args->size() == 1) {
+ flagfile_value->insert(flagfile_value->end(), flagfiles.begin(),
+ flagfiles.end());
+ }
+
+ success &= ReadFlagfiles(flagfiles, input_args);
+
+ flags_internal::flagfile_needs_processing = false;
+ }
+
+ // Similar to flagfile fromenv/tryfromemv can be set both
+ // programmatically and at runtime on a command line. Unlike flagfile these
+ // can't be recursive.
+ if (flags_internal::fromenv_needs_processing) {
+ auto flags_list = absl::GetFlag(FLAGS_fromenv);
+
+ success &= ReadFlagsFromEnv(flags_list, input_args, true);
+
+ flags_internal::fromenv_needs_processing = false;
+ }
+
+ if (flags_internal::tryfromenv_needs_processing) {
+ auto flags_list = absl::GetFlag(FLAGS_tryfromenv);
+
+ success &= ReadFlagsFromEnv(flags_list, input_args, false);
+
+ flags_internal::tryfromenv_needs_processing = false;
+ }
+
+ return success;
+}
+
+// --------------------------------------------------------------------
+
+void ResetGeneratorFlags(const std::vector<std::string>& flagfile_value) {
+ // Setting flagfile to the value which collates all the values set on a
+ // command line and programmatically. So if command line looked like
+ // --flagfile=f1 --flagfile=f2 the final value of the FLAGS_flagfile flag is
+ // going to be {"f1", "f2"}
+ if (!flagfile_value.empty()) {
+ absl::SetFlag(&FLAGS_flagfile, flagfile_value);
+ absl::MutexLock l(&flags_internal::processing_checks_guard);
+ flags_internal::flagfile_needs_processing = false;
+ }
+
+ // fromenv/tryfromenv are set to <undefined> value.
+ if (!absl::GetFlag(FLAGS_fromenv).empty()) {
+ absl::SetFlag(&FLAGS_fromenv, {});
+ }
+ if (!absl::GetFlag(FLAGS_tryfromenv).empty()) {
+ absl::SetFlag(&FLAGS_tryfromenv, {});
+ }
+
+ absl::MutexLock l(&flags_internal::processing_checks_guard);
+ flags_internal::fromenv_needs_processing = false;
+ flags_internal::tryfromenv_needs_processing = false;
+}
+
+// --------------------------------------------------------------------
+
+// Returns:
+// success status
+// deduced value
+// We are also mutating curr_list in case if we need to get a hold of next
+// argument in the input.
+std::tuple<bool, absl::string_view> DeduceFlagValue(const CommandLineFlag& flag,
+ absl::string_view value,
+ bool is_negative,
+ bool is_empty_value,
+ ArgsList* curr_list) {
+ // Value is either an argument suffix after `=` in "--foo=<value>"
+ // or separate argument in case of "--foo" "<value>".
+
+ // boolean flags have these forms:
+ // --foo
+ // --nofoo
+ // --foo=true
+ // --foo=false
+ // --nofoo=<value> is not supported
+ // --foo <value> is not supported
+
+ // non boolean flags have these forms:
+ // --foo=<value>
+ // --foo <value>
+ // --nofoo is not supported
+
+ if (flag.IsOfType<bool>()) {
+ if (value.empty()) {
+ if (is_empty_value) {
+ // "--bool_flag=" case
+ flags_internal::ReportUsageError(
+ absl::StrCat(
+ "Missing the value after assignment for the boolean flag '",
+ flag.Name(), "'"),
+ true);
+ return std::make_tuple(false, "");
+ }
+
+ // "--bool_flag" case
+ value = is_negative ? "0" : "1";
+ } else if (is_negative) {
+ // "--nobool_flag=Y" case
+ flags_internal::ReportUsageError(
+ absl::StrCat("Negative form with assignment is not valid for the "
+ "boolean flag '",
+ flag.Name(), "'"),
+ true);
+ return std::make_tuple(false, "");
+ }
+ } else if (is_negative) {
+ // "--noint_flag=1" case
+ flags_internal::ReportUsageError(
+ absl::StrCat("Negative form is not valid for the flag '", flag.Name(),
+ "'"),
+ true);
+ return std::make_tuple(false, "");
+ } else if (value.empty() && (!is_empty_value)) {
+ if (curr_list->Size() == 1) {
+ // "--int_flag" case
+ flags_internal::ReportUsageError(
+ absl::StrCat("Missing the value for the flag '", flag.Name(), "'"),
+ true);
+ return std::make_tuple(false, "");
+ }
+
+ // "--int_flag" "10" case
+ curr_list->PopFront();
+ value = curr_list->Front();
+
+ // Heuristic to detect the case where someone treats a std::string arg
+ // like a bool or just forgets to pass a value:
+ // --my_string_var --foo=bar
+ // We look for a flag of std::string type, whose value begins with a
+ // dash and corresponds to known flag or standalone --.
+ if (value[0] == '-' && flag.IsOfType<std::string>()) {
+ auto maybe_flag_name = std::get<0>(SplitNameAndValue(value.substr(1)));
+
+ if (maybe_flag_name.empty() ||
+ std::get<0>(LocateFlag(maybe_flag_name)) != nullptr) {
+ // "--string_flag" "--known_flag" case
+ ABSL_INTERNAL_LOG(
+ WARNING,
+ absl::StrCat("Did you really mean to set flag '", flag.Name(),
+ "' to the value '", value, "'?"));
+ }
+ }
+ }
+
+ return std::make_tuple(true, value);
+}
+
+// --------------------------------------------------------------------
+
+bool CanIgnoreUndefinedFlag(absl::string_view flag_name) {
+ auto undefok = absl::GetFlag(FLAGS_undefok);
+ if (std::find(undefok.begin(), undefok.end(), flag_name) != undefok.end()) {
+ return true;
+ }
+
+ if (absl::ConsumePrefix(&flag_name, "no") &&
+ std::find(undefok.begin(), undefok.end(), flag_name) != undefok.end()) {
+ return true;
+ }
+
+ return false;
+}
+
+} // namespace
+
+// --------------------------------------------------------------------
+
+std::vector<char*> ParseCommandLineImpl(int argc, char* argv[],
+ ArgvListAction arg_list_act,
+ UsageFlagsAction usage_flag_act,
+ OnUndefinedFlag on_undef_flag) {
+ ABSL_INTERNAL_CHECK(argc > 0, "Missing argv[0]");
+
+ // This routine does not return anything since we abort on failure.
+ CheckDefaultValuesParsingRoundtrip();
+
+ std::vector<std::string> flagfile_value;
+
+ std::vector<ArgsList> input_args;
+ input_args.push_back(ArgsList(argc, argv));
+
+ std::vector<char*> output_args;
+ std::vector<char*> positional_args;
+ output_args.reserve(argc);
+
+ // This is the list of undefined flags. The element of the list is the pair
+ // consisting of boolean indicating if flag came from command line (vs from
+ // some flag file we've read) and flag name.
+ // TODO(rogeeff): Eliminate the first element in the pair after cleanup.
+ std::vector<std::pair<bool, std::string>> undefined_flag_names;
+
+ // Set program invocation name if it is not set before.
+ if (ProgramInvocationName() == "UNKNOWN") {
+ flags_internal::SetProgramInvocationName(argv[0]);
+ }
+ output_args.push_back(argv[0]);
+
+ // Iterate through the list of the input arguments. First level are arguments
+ // originated from argc/argv. Following levels are arguments originated from
+ // recursive parsing of flagfile(s).
+ bool success = true;
+ while (!input_args.empty()) {
+ // 10. First we process the built-in generator flags.
+ success &= HandleGeneratorFlags(&input_args, &flagfile_value);
+
+ // 30. Select top-most (most recent) arguments list. If it is empty drop it
+ // and re-try.
+ ArgsList& curr_list = input_args.back();
+
+ curr_list.PopFront();
+
+ if (curr_list.Size() == 0) {
+ input_args.pop_back();
+ continue;
+ }
+
+ // 40. Pick up the front remaining argument in the current list. If current
+ // stack of argument lists contains only one element - we are processing an
+ // argument from the original argv.
+ absl::string_view arg(curr_list.Front());
+ bool arg_from_argv = input_args.size() == 1;
+
+ // 50. If argument does not start with - or is just "-" - this is
+ // positional argument.
+ if (!absl::ConsumePrefix(&arg, "-") || arg.empty()) {
+ ABSL_INTERNAL_CHECK(arg_from_argv,
+ "Flagfile cannot contain positional argument");
+
+ positional_args.push_back(argv[curr_list.FrontIndex()]);
+ continue;
+ }
+
+ if (arg_from_argv && (arg_list_act == ArgvListAction::kKeepParsedArgs)) {
+ output_args.push_back(argv[curr_list.FrontIndex()]);
+ }
+
+ // 60. Split the current argument on '=' to figure out the argument
+ // name and value. If flag name is empty it means we've got "--". value
+ // can be empty either if there were no '=' in argument std::string at all or
+ // an argument looked like "--foo=". In a latter case is_empty_value is
+ // true.
+ absl::string_view flag_name;
+ absl::string_view value;
+ bool is_empty_value = false;
+
+ std::tie(flag_name, value, is_empty_value) = SplitNameAndValue(arg);
+
+ // 70. "--" alone means what it does for GNU: stop flags parsing. We do
+ // not support positional arguments in flagfiles, so we just drop them.
+ if (flag_name.empty()) {
+ ABSL_INTERNAL_CHECK(arg_from_argv,
+ "Flagfile cannot contain positional argument");
+
+ curr_list.PopFront();
+ break;
+ }
+
+ // 80. Locate the flag based on flag name. Handle both --foo and --nofoo
+ CommandLineFlag* flag = nullptr;
+ bool is_negative = false;
+ std::tie(flag, is_negative) = LocateFlag(flag_name);
+
+ if (flag == nullptr) {
+ if (on_undef_flag != OnUndefinedFlag::kIgnoreUndefined) {
+ undefined_flag_names.emplace_back(arg_from_argv,
+ std::string(flag_name));
+ }
+ continue;
+ }
+
+ // 90. Deduce flag's value (from this or next argument)
+ auto curr_index = curr_list.FrontIndex();
+ bool value_success = true;
+ std::tie(value_success, value) =
+ DeduceFlagValue(*flag, value, is_negative, is_empty_value, &curr_list);
+ success &= value_success;
+
+ // If above call consumed an argument, it was a standalone value
+ if (arg_from_argv && (arg_list_act == ArgvListAction::kKeepParsedArgs) &&
+ (curr_index != curr_list.FrontIndex())) {
+ output_args.push_back(argv[curr_list.FrontIndex()]);
+ }
+
+ // 100. Set the located flag to a new new value, unless it is retired.
+ // Setting retired flag fails, but we ignoring it here.
+ if (flag->IsRetired()) continue;
+
+ std::string error;
+ if (!flag->SetFromString(value, SET_FLAGS_VALUE, kCommandLine, &error)) {
+ flags_internal::ReportUsageError(error, true);
+ success = false;
+ }
+ }
+
+ for (const auto& flag_name : undefined_flag_names) {
+ if (CanIgnoreUndefinedFlag(flag_name.second)) continue;
+
+ flags_internal::ReportUsageError(
+ absl::StrCat("Unknown command line flag '", flag_name.second, "'"),
+ true);
+
+ success = false;
+ }
+
+#if ABSL_FLAGS_STRIP_NAMES
+ if (!success) {
+ flags_internal::ReportUsageError(
+ "NOTE: command line flags are disabled in this build", true);
+ }
+#endif
+
+ if (!success) {
+ flags_internal::HandleUsageFlags(std::cout);
+ std::exit(1);
+ }
+
+ if (usage_flag_act == UsageFlagsAction::kHandleUsage) {
+ int exit_code = flags_internal::HandleUsageFlags(std::cout);
+
+ if (exit_code != -1) {
+ std::exit(exit_code);
+ }
+ }
+
+ ResetGeneratorFlags(flagfile_value);
+
+ // Reinstate positional args which were intermixed with flags in the arguments
+ // list.
+ for (auto arg : positional_args) {
+ output_args.push_back(arg);
+ }
+
+ // All the remaining arguments are positional.
+ if (!input_args.empty()) {
+ for (int arg_index = input_args.back().FrontIndex(); arg_index < argc;
+ ++arg_index) {
+ output_args.push_back(argv[arg_index]);
+ }
+ }
+
+ return output_args;
+}
+
+} // namespace flags_internal
+
+// --------------------------------------------------------------------
+
+std::vector<char*> ParseCommandLine(int argc, char* argv[]) {
+ return flags_internal::ParseCommandLineImpl(
+ argc, argv, flags_internal::ArgvListAction::kRemoveParsedArgs,
+ flags_internal::UsageFlagsAction::kHandleUsage,
+ flags_internal::OnUndefinedFlag::kAbortIfUndefined);
+}
+
+} // namespace absl
diff --git a/absl/flags/parse.h b/absl/flags/parse.h
new file mode 100644
index 0000000..dbb7510
--- /dev/null
+++ b/absl/flags/parse.h
@@ -0,0 +1,58 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: parse.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the main parsing function for Abseil flags:
+// `absl::ParseCommandLine()`.
+
+#ifndef ABSL_FLAGS_PARSE_H_
+#define ABSL_FLAGS_PARSE_H_
+
+#include <string>
+#include <vector>
+
+#include "absl/flags/internal/parse.h"
+
+namespace absl {
+
+// ParseCommandLine()
+//
+// Parses the set of command-line arguments passed in the `argc` (argument
+// count) and `argv[]` (argument vector) parameters from `main()`, assigning
+// values to any defined Abseil flags. (Any arguments passed after the
+// flag-terminating delimiter (`--`) are treated as positional arguments and
+// ignored.)
+//
+// Any command-line flags (and arguments to those flags) are parsed into Abseil
+// Flag values, if those flags are defined. Any undefined flags will either
+// return an error, or be ignored if that flag is designated using `undefok` to
+// indicate "undefined is OK."
+//
+// Any command-line positional arguments not part of any command-line flag (or
+// arguments to a flag) are returned in a vector, with the program invocation
+// name at position 0 of that vector. (Note that this includes positional
+// arguments after the flag-terminating delimiter `--`.)
+//
+// After all flags and flag arguments are parsed, this function looks for any
+// built-in usage flags (e.g. `--help`), and if any were specified, it reports
+// help messages and then exits the program.
+std::vector<char*> ParseCommandLine(int argc, char* argv[]);
+
+} // namespace absl
+
+#endif // ABSL_FLAGS_PARSE_H_
diff --git a/absl/flags/parse_test.cc b/absl/flags/parse_test.cc
new file mode 100644
index 0000000..447a3bc
--- /dev/null
+++ b/absl/flags/parse_test.cc
@@ -0,0 +1,858 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/parse.h"
+
+#include <fstream>
+
+#include "gmock/gmock.h"
+#include "gtest/gtest.h"
+#include "absl/base/internal/raw_logging.h"
+#include "absl/base/internal/scoped_set_env.h"
+#include "absl/flags/flag.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/substitute.h"
+#include "absl/types/span.h"
+
+#ifdef _WIN32
+#include <windows.h>
+#endif
+
+namespace {
+
+using absl::base_internal::ScopedSetEnv;
+
+struct UDT {
+ UDT() = default;
+ UDT(const UDT&) = default;
+ UDT(int v) : value(v) {} // NOLINT
+
+ int value;
+};
+
+bool AbslParseFlag(absl::string_view in, UDT* udt, std::string* err) {
+ if (in == "A") {
+ udt->value = 1;
+ return true;
+ }
+ if (in == "AAA") {
+ udt->value = 10;
+ return true;
+ }
+
+ *err = "Use values A, AAA instead";
+ return false;
+}
+std::string AbslUnparseFlag(const UDT& udt) {
+ return udt.value == 1 ? "A" : "AAA";
+}
+
+std::string GetTestTmpDirEnvVar(const char* const env_var_name) {
+#ifdef _WIN32
+ char buf[MAX_PATH];
+ auto get_res = GetEnvironmentVariableA(env_var_name, buf, sizeof(buf));
+ if (get_res >= sizeof(buf) || get_res == 0) {
+ return "";
+ }
+
+ return std::string(buf, get_res);
+#else
+ const char* val = ::getenv(env_var_name);
+ if (val == nullptr) {
+ return "";
+ }
+
+ return val;
+#endif
+}
+
+const std::string& GetTestTempDir() {
+ static std::string* temp_dir_name = []() -> std::string* {
+ std::string* res = new std::string(GetTestTmpDirEnvVar("TEST_TMPDIR"));
+
+ if (res->empty()) {
+ *res = GetTestTmpDirEnvVar("TMPDIR");
+ }
+
+ if (res->empty()) {
+#ifdef _WIN32
+ char temp_path_buffer[MAX_PATH];
+
+ auto len = GetTempPathA(MAX_PATH, temp_path_buffer);
+ if (len < MAX_PATH && len != 0) {
+ std::string temp_dir_name = absl::StrCat(
+ temp_path_buffer, "\\parse_test.", GetCurrentProcessId());
+ if (CreateDirectoryA(temp_dir_name.c_str(), nullptr)) {
+ *res = temp_dir_name;
+ }
+ }
+#else
+ char temp_dir_template[] = "/tmp/parse_test.XXXXXX";
+ if (auto* unique_name = ::mkdtemp(temp_dir_template)) {
+ *res = unique_name;
+ }
+#endif
+
+ if (res->empty()) {
+ ABSL_INTERNAL_LOG(FATAL,
+ "Failed to make temporary directory for data files");
+ }
+ }
+
+#ifdef _WIN32
+ *res += "\\";
+#else
+ *res += "/";
+#endif
+
+ return res;
+ }();
+
+ return *temp_dir_name;
+}
+
+struct FlagfileData {
+ const absl::string_view file_name;
+ const absl::Span<const char* const> file_lines;
+};
+
+// clang-format off
+constexpr const char* const ff1_data[] = {
+ "# comment ",
+ " # comment ",
+ "",
+ " ",
+ "--int_flag=-1",
+ " --string_flag=q2w2 ",
+ " ## ",
+ " --double_flag=0.1",
+ "--bool_flag=Y "
+};
+
+constexpr const char* const ff2_data[] = {
+ "# Setting legacy flag",
+ "--legacy_int=1111",
+ "--legacy_bool",
+ "--nobool_flag",
+ "--legacy_str=aqsw",
+ "--int_flag=100",
+ " ## ============="
+};
+// clang-format on
+
+// Builds flagfile flag in the flagfile_flag buffer and returns it. This
+// function also creates a temporary flagfile based on FlagfileData input.
+// We create a flagfile in a temporary directory with the name specified in
+// FlagfileData and populate it with lines specifed in FlagfileData. If $0 is
+// referenced in any of the lines in FlagfileData they are replaced with
+// temporary directory location. This way we can test inclusion of one flagfile
+// from another flagfile.
+const char* GetFlagfileFlag(const std::vector<FlagfileData>& ffd,
+ std::string* flagfile_flag) {
+ *flagfile_flag = "--flagfile=";
+ absl::string_view separator;
+ for (const auto& flagfile_data : ffd) {
+ std::string flagfile_name =
+ absl::StrCat(GetTestTempDir(), flagfile_data.file_name);
+
+ std::ofstream flagfile_out(flagfile_name);
+ for (auto line : flagfile_data.file_lines) {
+ flagfile_out << absl::Substitute(line, GetTestTempDir()) << "\n";
+ }
+
+ absl::StrAppend(flagfile_flag, separator, flagfile_name);
+ separator = ",";
+ }
+
+ return flagfile_flag->c_str();
+}
+
+} // namespace
+
+ABSL_FLAG(int, int_flag, 1, "");
+ABSL_FLAG(double, double_flag, 1.1, "");
+ABSL_FLAG(std::string, string_flag, "a", "");
+ABSL_FLAG(bool, bool_flag, false, "");
+ABSL_FLAG(UDT, udt_flag, -1, "");
+ABSL_RETIRED_FLAG(int, legacy_int, 1, "");
+ABSL_RETIRED_FLAG(bool, legacy_bool, false, "");
+ABSL_RETIRED_FLAG(std::string, legacy_str, "l", "");
+
+namespace {
+
+namespace flags = absl::flags_internal;
+using testing::ElementsAreArray;
+
+class ParseTest : public testing::Test {
+ private:
+ flags::FlagSaver flag_saver_;
+};
+
+// --------------------------------------------------------------------
+
+template <int N>
+std::vector<char*> InvokeParse(const char* (&in_argv)[N]) {
+ return absl::ParseCommandLine(N, const_cast<char**>(in_argv));
+}
+
+// --------------------------------------------------------------------
+
+template <int N>
+void TestParse(const char* (&in_argv)[N], int int_flag_value,
+ double double_flag_val, absl::string_view string_flag_val,
+ bool bool_flag_val, int exp_position_args = 0) {
+ auto out_args = InvokeParse(in_argv);
+
+ EXPECT_EQ(out_args.size(), 1 + exp_position_args);
+ EXPECT_STREQ(out_args[0], "testbin");
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), int_flag_value);
+ EXPECT_NEAR(absl::GetFlag(FLAGS_double_flag), double_flag_val, 0.0001);
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), string_flag_val);
+ EXPECT_EQ(absl::GetFlag(FLAGS_bool_flag), bool_flag_val);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestEmptyArgv) {
+ const char* in_argv[] = {"testbin"};
+
+ auto out_args = InvokeParse(in_argv);
+
+ EXPECT_EQ(out_args.size(), 1);
+ EXPECT_STREQ(out_args[0], "testbin");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidIntArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--int_flag=10",
+ };
+ TestParse(in_args1, 10, 1.1, "a", false);
+
+ const char* in_args2[] = {
+ "testbin",
+ "-int_flag=020",
+ };
+ TestParse(in_args2, 20, 1.1, "a", false);
+
+ const char* in_args3[] = {
+ "testbin",
+ "--int_flag",
+ "-30",
+ };
+ TestParse(in_args3, -30, 1.1, "a", false);
+
+ const char* in_args4[] = {
+ "testbin",
+ "-int_flag",
+ "0x21",
+ };
+ TestParse(in_args4, 33, 1.1, "a", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidDoubleArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--double_flag=2.3",
+ };
+ TestParse(in_args1, 1, 2.3, "a", false);
+
+ const char* in_args2[] = {
+ "testbin",
+ "--double_flag=0x1.2",
+ };
+ TestParse(in_args2, 1, 1.125, "a", false);
+
+ const char* in_args3[] = {
+ "testbin",
+ "--double_flag",
+ "99.7",
+ };
+ TestParse(in_args3, 1, 99.7, "a", false);
+
+ const char* in_args4[] = {
+ "testbin",
+ "--double_flag",
+ "0x20.1",
+ };
+ TestParse(in_args4, 1, 32.0625, "a", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidStringArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--string_flag=aqswde",
+ };
+ TestParse(in_args1, 1, 1.1, "aqswde", false);
+
+ const char* in_args2[] = {
+ "testbin",
+ "-string_flag=a=b=c",
+ };
+ TestParse(in_args2, 1, 1.1, "a=b=c", false);
+
+ const char* in_args3[] = {
+ "testbin",
+ "--string_flag",
+ "zaxscd",
+ };
+ TestParse(in_args3, 1, 1.1, "zaxscd", false);
+
+ const char* in_args4[] = {
+ "testbin",
+ "-string_flag",
+ "--int_flag",
+ };
+ TestParse(in_args4, 1, 1.1, "--int_flag", false);
+
+ const char* in_args5[] = {
+ "testbin",
+ "--string_flag",
+ "--no_a_flag=11",
+ };
+ TestParse(in_args5, 1, 1.1, "--no_a_flag=11", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidBoolArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--bool_flag",
+ };
+ TestParse(in_args1, 1, 1.1, "a", true);
+
+ const char* in_args2[] = {
+ "testbin",
+ "--nobool_flag",
+ };
+ TestParse(in_args2, 1, 1.1, "a", false);
+
+ const char* in_args3[] = {
+ "testbin",
+ "--bool_flag=true",
+ };
+ TestParse(in_args3, 1, 1.1, "a", true);
+
+ const char* in_args4[] = {
+ "testbin",
+ "-bool_flag=false",
+ };
+ TestParse(in_args4, 1, 1.1, "a", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidUDTArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--udt_flag=A",
+ };
+ InvokeParse(in_args1);
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_udt_flag).value, 1);
+
+ const char* in_args2[] = {"testbin", "--udt_flag", "AAA"};
+ InvokeParse(in_args2);
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_udt_flag).value, 10);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidMultipleArg) {
+ const char* in_args1[] = {
+ "testbin", "--bool_flag", "--int_flag=2",
+ "--double_flag=0.1", "--string_flag=asd",
+ };
+ TestParse(in_args1, 2, 0.1, "asd", true);
+
+ const char* in_args2[] = {
+ "testbin", "--string_flag=", "--nobool_flag", "--int_flag",
+ "-011", "--double_flag", "-1e-2",
+ };
+ TestParse(in_args2, -11, -0.01, "", false);
+
+ const char* in_args3[] = {
+ "testbin", "--int_flag", "-0", "--string_flag", "\"\"",
+ "--bool_flag=true", "--double_flag=1e18",
+ };
+ TestParse(in_args3, 0, 1e18, "\"\"", true);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestPositionalArgs) {
+ const char* in_args1[] = {
+ "testbin",
+ "p1",
+ "p2",
+ };
+ TestParse(in_args1, 1, 1.1, "a", false, 2);
+
+ auto out_args1 = InvokeParse(in_args1);
+
+ EXPECT_STREQ(out_args1[1], "p1");
+ EXPECT_STREQ(out_args1[2], "p2");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--int_flag=2",
+ "p1",
+ };
+ TestParse(in_args2, 2, 1.1, "a", false, 1);
+
+ auto out_args2 = InvokeParse(in_args2);
+
+ EXPECT_STREQ(out_args2[1], "p1");
+
+ const char* in_args3[] = {"testbin", "p1", "--int_flag=3",
+ "p2", "--bool_flag", "true"};
+ TestParse(in_args3, 3, 1.1, "a", true, 3);
+
+ auto out_args3 = InvokeParse(in_args3);
+
+ EXPECT_STREQ(out_args3[1], "p1");
+ EXPECT_STREQ(out_args3[2], "p2");
+ EXPECT_STREQ(out_args3[3], "true");
+
+ const char* in_args4[] = {
+ "testbin",
+ "--",
+ "p1",
+ "p2",
+ };
+ TestParse(in_args4, 3, 1.1, "a", true, 2);
+
+ auto out_args4 = InvokeParse(in_args4);
+
+ EXPECT_STREQ(out_args4[1], "p1");
+ EXPECT_STREQ(out_args4[2], "p2");
+
+ const char* in_args5[] = {
+ "testbin", "p1", "--int_flag=4", "--", "--bool_flag", "false", "p2",
+ };
+ TestParse(in_args5, 4, 1.1, "a", true, 4);
+
+ auto out_args5 = InvokeParse(in_args5);
+
+ EXPECT_STREQ(out_args5[1], "p1");
+ EXPECT_STREQ(out_args5[2], "--bool_flag");
+ EXPECT_STREQ(out_args5[3], "false");
+ EXPECT_STREQ(out_args5[4], "p2");
+}
+
+// --------------------------------------------------------------------
+
+using ParseDeathTest = ParseTest;
+
+TEST_F(ParseDeathTest, TestUndefinedArg) {
+ const char* in_args1[] = {
+ "testbin",
+ "--undefined_flag",
+ };
+ EXPECT_DEATH(InvokeParse(in_args1),
+ "Unknown command line flag 'undefined_flag'");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--noprefixed_flag",
+ };
+ EXPECT_DEATH(InvokeParse(in_args2),
+ "Unknown command line flag 'noprefixed_flag'");
+
+ const char* in_args3[] = {
+ "testbin",
+ "--Int_flag=1",
+ };
+ EXPECT_DEATH(InvokeParse(in_args3), "Unknown command line flag 'Int_flag'");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestInvalidBoolFlagFormat) {
+ const char* in_args1[] = {
+ "testbin",
+ "--bool_flag=",
+ };
+ EXPECT_DEATH(
+ InvokeParse(in_args1),
+ "Missing the value after assignment for the boolean flag 'bool_flag'");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--nobool_flag=true",
+ };
+ EXPECT_DEATH(InvokeParse(in_args2),
+ "Negative form with assignment is not valid for the boolean "
+ "flag 'bool_flag'");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestInvalidNonBoolFlagFormat) {
+ const char* in_args1[] = {
+ "testbin",
+ "--nostring_flag",
+ };
+ EXPECT_DEATH(InvokeParse(in_args1),
+ "Negative form is not valid for the flag 'string_flag'");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--int_flag",
+ };
+ EXPECT_DEATH(InvokeParse(in_args2),
+ "Missing the value for the flag 'int_flag'");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestInvalidUDTFlagFormat) {
+ const char* in_args1[] = {
+ "testbin",
+ "--udt_flag=1",
+ };
+ EXPECT_DEATH(InvokeParse(in_args1),
+ "Illegal value '1' specified for flag 'udt_flag'; Use values A, "
+ "AAA instead");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--udt_flag",
+ "AA",
+ };
+ EXPECT_DEATH(InvokeParse(in_args2),
+ "Illegal value 'AA' specified for flag 'udt_flag'; Use values "
+ "A, AAA instead");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestLegacyFlags) {
+ const char* in_args1[] = {
+ "testbin",
+ "--legacy_int=11",
+ };
+ TestParse(in_args1, 1, 1.1, "a", false);
+
+ const char* in_args2[] = {
+ "testbin",
+ "--legacy_bool",
+ };
+ TestParse(in_args2, 1, 1.1, "a", false);
+
+ const char* in_args3[] = {
+ "testbin", "--legacy_int", "22", "--int_flag=2",
+ "--legacy_bool", "true", "--legacy_str", "--string_flag=qwe",
+ };
+ TestParse(in_args3, 2, 1.1, "a", false, 1);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestSimpleValidFlagfile) {
+ std::string flagfile_flag;
+
+ const char* in_args1[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
+ &flagfile_flag),
+ };
+ TestParse(in_args1, -1, 0.1, "q2w2 ", true);
+
+ const char* in_args2[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff2", absl::MakeConstSpan(ff2_data)}},
+ &flagfile_flag),
+ };
+ TestParse(in_args2, 100, 0.1, "q2w2 ", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestValidMultiFlagfile) {
+ std::string flagfile_flag;
+
+ const char* in_args1[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff2", absl::MakeConstSpan(ff2_data)},
+ {"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
+ &flagfile_flag),
+ };
+ TestParse(in_args1, -1, 0.1, "q2w2 ", true);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestFlagfileMixedWithRegularFlags) {
+ std::string flagfile_flag;
+
+ const char* in_args1[] = {
+ "testbin", "--int_flag=3",
+ GetFlagfileFlag({{"parse_test.ff1", absl::MakeConstSpan(ff1_data)}},
+ &flagfile_flag),
+ "-double_flag=0.2"};
+ TestParse(in_args1, -1, 0.2, "q2w2 ", true);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestFlagfileInFlagfile) {
+ std::string flagfile_flag;
+
+ constexpr const char* const ff3_data[] = {
+ "--flagfile=$0/parse_test.ff1",
+ "--flagfile=$0/parse_test.ff2",
+ };
+
+ const char* in_args1[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff3", absl::MakeConstSpan(ff3_data)}},
+ &flagfile_flag),
+ };
+ TestParse(in_args1, 100, 0.1, "q2w2 ", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestInvalidFlagfiles) {
+ std::string flagfile_flag;
+
+ constexpr const char* const ff4_data[] = {
+ "--unknown_flag=10"
+ };
+
+ const char* in_args1[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff4",
+ absl::MakeConstSpan(ff4_data)}}, &flagfile_flag),
+ };
+ EXPECT_DEATH(InvokeParse(in_args1),
+ "Unknown command line flag 'unknown_flag'");
+
+ constexpr const char* const ff5_data[] = {
+ "--int_flag 10",
+ };
+
+ const char* in_args2[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff5",
+ absl::MakeConstSpan(ff5_data)}}, &flagfile_flag),
+ };
+ EXPECT_DEATH(InvokeParse(in_args2),
+ "Unknown command line flag 'int_flag 10'");
+
+ constexpr const char* const ff6_data[] = {
+ "--int_flag=10", "--", "arg1", "arg2", "arg3",
+ };
+
+ const char* in_args3[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff6", absl::MakeConstSpan(ff6_data)}},
+ &flagfile_flag),
+ };
+ EXPECT_DEATH(InvokeParse(in_args3),
+ "Flagfile can't contain position arguments or --");
+
+ const char* in_args4[] = {
+ "testbin",
+ "--flagfile=invalid_flag_file",
+ };
+ EXPECT_DEATH(InvokeParse(in_args4), "Can't open flagfile invalid_flag_file");
+
+ constexpr const char* const ff7_data[] = {
+ "--int_flag=10",
+ "*bin*",
+ "--str_flag=aqsw",
+ };
+
+ const char* in_args5[] = {
+ "testbin",
+ GetFlagfileFlag({{"parse_test.ff7", absl::MakeConstSpan(ff7_data)}},
+ &flagfile_flag),
+ };
+ EXPECT_DEATH(InvokeParse(in_args5),
+ "Unexpected line in the flagfile .*: \\*bin\\*");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestReadingRequiredFlagsFromEnv) {
+ const char* in_args1[] = {"testbin",
+ "--fromenv=int_flag,bool_flag,string_flag"};
+
+ ScopedSetEnv set_int_flag("FLAGS_int_flag", "33");
+ ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "True");
+ ScopedSetEnv set_string_flag("FLAGS_string_flag", "AQ12");
+
+ TestParse(in_args1, 33, 1.1, "AQ12", true);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestReadingUnsetRequiredFlagsFromEnv) {
+ const char* in_args1[] = {"testbin", "--fromenv=int_flag"};
+
+ EXPECT_DEATH(InvokeParse(in_args1),
+ "FLAGS_int_flag not found in environment");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestRecursiveFlagsFromEnv) {
+ const char* in_args1[] = {"testbin", "--fromenv=tryfromenv"};
+
+ ScopedSetEnv set_tryfromenv("FLAGS_tryfromenv", "int_flag");
+
+ EXPECT_DEATH(InvokeParse(in_args1), "Infinite recursion on flag tryfromenv");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestReadingOptionalFlagsFromEnv) {
+ const char* in_args1[] = {
+ "testbin", "--tryfromenv=int_flag,bool_flag,string_flag,other_flag"};
+
+ ScopedSetEnv set_int_flag("FLAGS_int_flag", "17");
+ ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "Y");
+
+ TestParse(in_args1, 17, 1.1, "a", true);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestReadingFlagsFromEnvMoxedWithRegularFlags) {
+ const char* in_args1[] = {
+ "testbin",
+ "--bool_flag=T",
+ "--tryfromenv=int_flag,bool_flag",
+ "--int_flag=-21",
+ };
+
+ ScopedSetEnv set_int_flag("FLAGS_int_flag", "-15");
+ ScopedSetEnv set_bool_flag("FLAGS_bool_flag", "F");
+
+ TestParse(in_args1, -21, 1.1, "a", false);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestKeepParsedArgs) {
+ const char* in_args1[] = {
+ "testbin", "arg1", "--bool_flag",
+ "--int_flag=211", "arg2", "--double_flag=1.1",
+ "--string_flag", "asd", "--",
+ "arg3", "arg4",
+ };
+
+ auto out_args1 = InvokeParse(in_args1);
+
+ EXPECT_THAT(
+ out_args1,
+ ElementsAreArray({absl::string_view("testbin"), absl::string_view("arg1"),
+ absl::string_view("arg2"), absl::string_view("arg3"),
+ absl::string_view("arg4")}));
+
+ auto out_args2 = flags::ParseCommandLineImpl(
+ 11, const_cast<char**>(in_args1), flags::ArgvListAction::kKeepParsedArgs,
+ flags::UsageFlagsAction::kHandleUsage,
+ flags::OnUndefinedFlag::kAbortIfUndefined);
+
+ EXPECT_THAT(
+ out_args2,
+ ElementsAreArray({absl::string_view("testbin"),
+ absl::string_view("--bool_flag"),
+ absl::string_view("--int_flag=211"),
+ absl::string_view("--double_flag=1.1"),
+ absl::string_view("--string_flag"),
+ absl::string_view("asd"), absl::string_view("--"),
+ absl::string_view("arg1"), absl::string_view("arg2"),
+ absl::string_view("arg3"), absl::string_view("arg4")}));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseTest, TestIgnoreUndefinedFlags) {
+ const char* in_args1[] = {
+ "testbin",
+ "arg1",
+ "--undef_flag=aa",
+ "--int_flag=21",
+ };
+
+ auto out_args1 = flags::ParseCommandLineImpl(
+ 4, const_cast<char**>(in_args1), flags::ArgvListAction::kRemoveParsedArgs,
+ flags::UsageFlagsAction::kHandleUsage,
+ flags::OnUndefinedFlag::kIgnoreUndefined);
+
+ EXPECT_THAT(out_args1, ElementsAreArray({absl::string_view("testbin"),
+ absl::string_view("arg1")}));
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 21);
+
+ const char* in_args2[] = {
+ "testbin",
+ "arg1",
+ "--undef_flag=aa",
+ "--string_flag=AA",
+ };
+
+ auto out_args2 = flags::ParseCommandLineImpl(
+ 4, const_cast<char**>(in_args2), flags::ArgvListAction::kKeepParsedArgs,
+ flags::UsageFlagsAction::kHandleUsage,
+ flags::OnUndefinedFlag::kIgnoreUndefined);
+
+ EXPECT_THAT(
+ out_args2,
+ ElementsAreArray(
+ {absl::string_view("testbin"), absl::string_view("--undef_flag=aa"),
+ absl::string_view("--string_flag=AA"), absl::string_view("arg1")}));
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_string_flag), "AA");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(ParseDeathTest, TestHelpFlagHandling) {
+ const char* in_args1[] = {
+ "testbin",
+ "--help",
+ };
+
+ EXPECT_EXIT(InvokeParse(in_args1), testing::ExitedWithCode(1), "");
+
+ const char* in_args2[] = {
+ "testbin",
+ "--help",
+ "--int_flag=3",
+ };
+
+ auto out_args2 = flags::ParseCommandLineImpl(
+ 3, const_cast<char**>(in_args2), flags::ArgvListAction::kRemoveParsedArgs,
+ flags::UsageFlagsAction::kIgnoreUsage,
+ flags::OnUndefinedFlag::kAbortIfUndefined);
+
+ EXPECT_EQ(absl::GetFlag(FLAGS_int_flag), 3);
+}
+
+} // namespace
diff --git a/absl/flags/usage_config.cc b/absl/flags/usage_config.cc
new file mode 100644
index 0000000..d34ecfc
--- /dev/null
+++ b/absl/flags/usage_config.cc
@@ -0,0 +1,152 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/usage_config.h"
+
+#include <iostream>
+#include <memory>
+
+#include "absl/base/attributes.h"
+#include "absl/flags/internal/path_util.h"
+#include "absl/flags/internal/program_name.h"
+#include "absl/strings/str_cat.h"
+#include "absl/strings/strip.h"
+#include "absl/synchronization/mutex.h"
+
+extern "C" {
+
+// Additional report of fatal usage error message before we std::exit. Error is
+// fatal if is_fatal argument to ReportUsageError is true.
+ABSL_ATTRIBUTE_WEAK void AbslInternalReportFatalUsageError(absl::string_view) {}
+
+} // extern "C"
+
+namespace absl {
+namespace flags_internal {
+
+namespace {
+
+// --------------------------------------------------------------------
+// Returns true if flags defined in the filename should be reported with
+// -helpshort flag.
+
+bool ContainsHelpshortFlags(absl::string_view filename) {
+ // By default we only want flags in binary's main. We expect the main
+ // routine to reside in <program>.cc or <program>-main.cc or
+ // <program>_main.cc, where the <program> is the name of the binary.
+ auto suffix = flags_internal::Basename(filename);
+ if (!absl::ConsumePrefix(&suffix,
+ flags_internal::ShortProgramInvocationName()))
+ return false;
+ return absl::StartsWith(suffix, ".") || absl::StartsWith(suffix, "-main.") ||
+ absl::StartsWith(suffix, "_main.");
+}
+
+// --------------------------------------------------------------------
+// Returns true if flags defined in the filename should be reported with
+// -helppackage flag.
+
+bool ContainsHelppackageFlags(absl::string_view filename) {
+ // TODO(rogeeff): implement properly when registry is available.
+ return ContainsHelpshortFlags(filename);
+}
+
+// --------------------------------------------------------------------
+// Generates program version information into supplied output.
+
+std::string VersionString() {
+ std::string version_str(flags_internal::ShortProgramInvocationName());
+
+ version_str += "\n";
+
+#if !defined(NDEBUG)
+ version_str += "Debug build (NDEBUG not #defined)\n";
+#endif
+
+ return version_str;
+}
+
+// --------------------------------------------------------------------
+// Normalizes the filename specific to the build system/filesystem used.
+
+std::string NormalizeFilename(absl::string_view filename) {
+ // Skip any leading slashes
+ auto pos = filename.find_first_not_of("\\/");
+ if (pos == absl::string_view::npos) return "";
+
+ filename.remove_prefix(pos);
+ return std::string(filename);
+}
+
+// --------------------------------------------------------------------
+
+ABSL_CONST_INIT absl::Mutex custom_usage_config_guard(absl::kConstInit);
+ABSL_CONST_INIT FlagsUsageConfig* custom_usage_config
+ GUARDED_BY(custom_usage_config_guard) = nullptr;
+
+} // namespace
+
+FlagsUsageConfig GetUsageConfig() {
+ absl::MutexLock l(&custom_usage_config_guard);
+
+ if (custom_usage_config) return *custom_usage_config;
+
+ FlagsUsageConfig default_config;
+ default_config.contains_helpshort_flags = &ContainsHelpshortFlags;
+ default_config.contains_help_flags = &ContainsHelppackageFlags;
+ default_config.contains_helppackage_flags = &ContainsHelppackageFlags;
+ default_config.version_string = &VersionString;
+ default_config.normalize_filename = &NormalizeFilename;
+
+ return default_config;
+}
+
+void ReportUsageError(absl::string_view msg, bool is_fatal) {
+ std::cerr << "ERROR: " << msg << std::endl;
+
+ if (is_fatal) {
+ AbslInternalReportFatalUsageError(msg);
+ }
+}
+
+} // namespace flags_internal
+
+void SetFlagsUsageConfig(FlagsUsageConfig usage_config) {
+ absl::MutexLock l(&flags_internal::custom_usage_config_guard);
+
+ if (!usage_config.contains_helpshort_flags)
+ usage_config.contains_helpshort_flags =
+ flags_internal::ContainsHelpshortFlags;
+
+ if (!usage_config.contains_help_flags)
+ usage_config.contains_help_flags = flags_internal::ContainsHelppackageFlags;
+
+ if (!usage_config.contains_helppackage_flags)
+ usage_config.contains_helppackage_flags =
+ flags_internal::ContainsHelppackageFlags;
+
+ if (!usage_config.version_string)
+ usage_config.version_string = flags_internal::VersionString;
+
+ if (!usage_config.normalize_filename)
+ usage_config.normalize_filename = flags_internal::NormalizeFilename;
+
+ if (flags_internal::custom_usage_config)
+ *flags_internal::custom_usage_config = usage_config;
+ else
+ flags_internal::custom_usage_config = new FlagsUsageConfig(usage_config);
+}
+
+} // namespace absl
diff --git a/absl/flags/usage_config.h b/absl/flags/usage_config.h
new file mode 100644
index 0000000..ee5016a
--- /dev/null
+++ b/absl/flags/usage_config.h
@@ -0,0 +1,131 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//
+// -----------------------------------------------------------------------------
+// File: usage_config.h
+// -----------------------------------------------------------------------------
+//
+// This file defines the main usage reporting configuration interfaces and
+// documents Abseil's supported built-in usage flags. If these flags are found
+// when parsing a command-line, Abseil will exit the program and display
+// appropriate help messages.
+#ifndef ABSL_FLAGS_USAGE_CONFIG_H_
+#define ABSL_FLAGS_USAGE_CONFIG_H_
+
+#include <functional>
+#include <string>
+
+#include "absl/strings/string_view.h"
+
+// -----------------------------------------------------------------------------
+// Built-in Usage Flags
+// -----------------------------------------------------------------------------
+//
+// Abseil supports the following built-in usage flags. When passed, these flags
+// exit the program and :
+//
+// * --help
+// Shows help on important flags for this binary
+// * --helpfull
+// Shows help on all flags
+// * --helpshort
+// Shows help on only the main module for this program
+// * --helppackage
+// Shows help on all modules in the main package
+// * --version
+// Shows the version and build info for this binary and exits
+// * --only_check_args
+// Exits after checking all flags
+// * --helpon
+// Shows help on the modules named by this flag value
+// * --helpmatch
+// Shows help on modules whose name contains the specified substring
+
+namespace absl {
+
+namespace flags_internal {
+using FlagKindFilter = std::function<bool (absl::string_view)>;
+} // namespace flags_internal
+
+// FlagsUsageConfig
+//
+// This structure contains the collection of callbacks for changing the behavior
+// of the usage reporting routines in Abseil Flags.
+struct FlagsUsageConfig {
+ // Returns true if flags defined in the given source code file should be
+ // reported with --helpshort flag. For example, if the file
+ // "path/to/my/code.cc" defines the flag "--my_flag", and
+ // contains_helpshort_flags("path/to/my/code.cc") returns true, invoking the
+ // program with --helpshort will include information about --my_flag in the
+ // program output.
+ flags_internal::FlagKindFilter contains_helpshort_flags;
+
+ // Returns true if flags defined in the filename should be reported with
+ // --help flag. For example, if the file
+ // "path/to/my/code.cc" defines the flag "--my_flag", and
+ // contains_help_flags("path/to/my/code.cc") returns true, invoking the
+ // program with --help will include information about --my_flag in the
+ // program output.
+ flags_internal::FlagKindFilter contains_help_flags;
+
+ // Returns true if flags defined in the filename should be reported with
+ // --helppackage flag. For example, if the file
+ // "path/to/my/code.cc" defines the flag "--my_flag", and
+ // contains_helppackage_flags("path/to/my/code.cc") returns true, invoking the
+ // program with --helppackage will include information about --my_flag in the
+ // program output.
+ flags_internal::FlagKindFilter contains_helppackage_flags;
+
+ // Generates std::string containing program version. This is the std::string reported
+ // when user specifies --version in a command line.
+ std::function<std::string()> version_string;
+
+ // Normalizes the filename specific to the build system/filesystem used. This
+ // routine is used when we report the information about the flag definition
+ // location. For instance, if your build resides at some location you do not
+ // want to expose in the usage output, you can trim it to show only relevant
+ // part.
+ // For example:
+ // normalize_filename("/my_company/some_long_path/src/project/file.cc")
+ // might produce
+ // "project/file.cc".
+ std::function<std::string (absl::string_view)> normalize_filename;
+};
+
+// SetFlagsUsageConfig()
+//
+// Sets the usage reporting configuration callbacks. If any of the callbacks are
+// not set in usage_config instance, then the default value of the callback is
+// used.
+void SetFlagsUsageConfig(FlagsUsageConfig usage_config);
+
+namespace flags_internal {
+
+FlagsUsageConfig GetUsageConfig();
+
+void ReportUsageError(absl::string_view msg, bool is_fatal);
+
+} // namespace flags_internal
+} // namespace absl
+
+extern "C" {
+
+// Additional report of fatal usage error message before we std::exit. Error is
+// fatal if is_fatal argument to ReportUsageError is true.
+void AbslInternalReportFatalUsageError(absl::string_view);
+
+} // extern "C"
+
+#endif // ABSL_FLAGS_USAGE_CONFIG_H_
diff --git a/absl/flags/usage_config_test.cc b/absl/flags/usage_config_test.cc
new file mode 100644
index 0000000..3bde13a
--- /dev/null
+++ b/absl/flags/usage_config_test.cc
@@ -0,0 +1,198 @@
+//
+// Copyright 2019 The Abseil Authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+// https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "absl/flags/usage_config.h"
+
+#include "gtest/gtest.h"
+#include "absl/flags/internal/path_util.h"
+#include "absl/flags/internal/program_name.h"
+#include "absl/strings/match.h"
+
+namespace {
+
+class FlagsUsageConfigTest : public testing::Test {
+ protected:
+ void SetUp() override {
+ // Install Default config for the use on this unit test.
+ // Binary may install a custom config before tests are run.
+ absl::FlagsUsageConfig default_config;
+ absl::SetFlagsUsageConfig(default_config);
+ }
+};
+
+namespace flags = absl::flags_internal;
+
+bool TstContainsHelpshortFlags(absl::string_view f) {
+ return absl::StartsWith(flags::Basename(f), "progname.");
+}
+
+bool TstContainsHelppackageFlags(absl::string_view f) {
+ return absl::EndsWith(flags::Package(f), "aaa/");
+}
+
+bool TstContainsHelpFlags(absl::string_view f) {
+ return absl::EndsWith(flags::Package(f), "zzz/");
+}
+
+std::string TstVersionString() { return "program 1.0.0"; }
+
+std::string TstNormalizeFilename(absl::string_view filename) {
+ return std::string(filename.substr(2));
+}
+
+void TstReportUsageMessage(absl::string_view msg) {}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestGetSetFlagsUsageConfig) {
+ EXPECT_TRUE(flags::GetUsageConfig().contains_helpshort_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().contains_helppackage_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().version_string);
+ EXPECT_TRUE(flags::GetUsageConfig().normalize_filename);
+
+ absl::FlagsUsageConfig empty_config;
+ empty_config.contains_helpshort_flags = &TstContainsHelpshortFlags;
+ empty_config.contains_help_flags = &TstContainsHelpFlags;
+ empty_config.contains_helppackage_flags = &TstContainsHelppackageFlags;
+ empty_config.version_string = &TstVersionString;
+ empty_config.normalize_filename = &TstNormalizeFilename;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_TRUE(flags::GetUsageConfig().contains_helpshort_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().contains_helppackage_flags);
+ EXPECT_TRUE(flags::GetUsageConfig().version_string);
+ EXPECT_TRUE(flags::GetUsageConfig().normalize_filename);
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestContainsHelpshortFlags) {
+ flags::SetProgramInvocationName("usage_config_test");
+
+ auto config = flags::GetUsageConfig();
+ EXPECT_TRUE(config.contains_helpshort_flags("adir/cd/usage_config_test.cc"));
+ EXPECT_TRUE(
+ config.contains_helpshort_flags("aaaa/usage_config_test-main.cc"));
+ EXPECT_TRUE(config.contains_helpshort_flags("abc/usage_config_test_main.cc"));
+ EXPECT_FALSE(config.contains_helpshort_flags("usage_config_main.cc"));
+
+ absl::FlagsUsageConfig empty_config;
+ empty_config.contains_helpshort_flags = &TstContainsHelpshortFlags;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_TRUE(
+ flags::GetUsageConfig().contains_helpshort_flags("aaa/progname.cpp"));
+ EXPECT_FALSE(
+ flags::GetUsageConfig().contains_helpshort_flags("aaa/progmane.cpp"));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestContainsHelpFlags) {
+ flags::SetProgramInvocationName("usage_config_test");
+
+ auto config = flags::GetUsageConfig();
+ EXPECT_TRUE(config.contains_help_flags("zzz/usage_config_test.cc"));
+ EXPECT_TRUE(
+ config.contains_help_flags("bdir/a/zzz/usage_config_test-main.cc"));
+ EXPECT_TRUE(
+ config.contains_help_flags("//aqse/zzz/usage_config_test_main.cc"));
+ EXPECT_FALSE(config.contains_help_flags("zzz/aa/usage_config_main.cc"));
+
+ absl::FlagsUsageConfig empty_config;
+ empty_config.contains_help_flags = &TstContainsHelpFlags;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_TRUE(flags::GetUsageConfig().contains_help_flags("zzz/main-body.c"));
+ EXPECT_FALSE(
+ flags::GetUsageConfig().contains_help_flags("zzz/dir/main-body.c"));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestContainsHelppackageFlags) {
+ flags::SetProgramInvocationName("usage_config_test");
+
+ auto config = flags::GetUsageConfig();
+ EXPECT_TRUE(config.contains_helppackage_flags("aaa/usage_config_test.cc"));
+ EXPECT_TRUE(
+ config.contains_helppackage_flags("bbdir/aaa/usage_config_test-main.cc"));
+ EXPECT_TRUE(config.contains_helppackage_flags(
+ "//aqswde/aaa/usage_config_test_main.cc"));
+ EXPECT_FALSE(config.contains_helppackage_flags("aadir/usage_config_main.cc"));
+
+ absl::FlagsUsageConfig empty_config;
+ empty_config.contains_helppackage_flags = &TstContainsHelppackageFlags;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_TRUE(
+ flags::GetUsageConfig().contains_helppackage_flags("aaa/main-body.c"));
+ EXPECT_FALSE(
+ flags::GetUsageConfig().contains_helppackage_flags("aadir/main-body.c"));
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestVersionString) {
+ flags::SetProgramInvocationName("usage_config_test");
+
+#ifdef NDEBUG
+ std::string expected_output = "usage_config_test\n";
+#else
+ std::string expected_output =
+ "usage_config_test\nDebug build (NDEBUG not #defined)\n";
+#endif
+
+ EXPECT_EQ(flags::GetUsageConfig().version_string(), expected_output);
+
+ absl::FlagsUsageConfig empty_config;
+ empty_config.version_string = &TstVersionString;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_EQ(flags::GetUsageConfig().version_string(), "program 1.0.0");
+}
+
+// --------------------------------------------------------------------
+
+TEST_F(FlagsUsageConfigTest, TestNormalizeFilename) {
+ // This tests the default implementation.
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("///a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/"), "");
+
+ // This tests that the custom implementation is called.
+ absl::FlagsUsageConfig empty_config;
+ empty_config.normalize_filename = &TstNormalizeFilename;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("aaa/a.cc"), "a/a.cc");
+
+ // This tests that the default implementation is called.
+ empty_config.normalize_filename = nullptr;
+ absl::SetFlagsUsageConfig(empty_config);
+
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("/a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("///a/a.cc"), "a/a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("\\a\\a.cc"), "a\\a.cc");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("//"), "");
+ EXPECT_EQ(flags::GetUsageConfig().normalize_filename("\\\\"), "");
+}
+
+} // namespace
diff --git a/absl/hash/BUILD.bazel b/absl/hash/BUILD.bazel
index e1e6eae..8c2daf7 100644
--- a/absl/hash/BUILD.bazel
+++ b/absl/hash/BUILD.bazel
@@ -35,10 +35,10 @@
copts = ABSL_DEFAULT_COPTS,
linkopts = ABSL_DEFAULT_LINKOPTS,
deps = [
+ ":city",
"//absl/base:core_headers",
"//absl/base:endian",
"//absl/container:fixed_array",
- "//absl/hash:city",
"//absl/meta:type_traits",
"//absl/numeric:int128",
"//absl/strings",
diff --git a/absl/hash/hash.h b/absl/hash/hash.h
index 339b685..297dc9c 100644
--- a/absl/hash/hash.h
+++ b/absl/hash/hash.h
@@ -42,23 +42,28 @@
//
// Example:
//
-// // Suppose we have a class `Circle` for which we want to add hashing
+// // Suppose we have a class `Circle` for which we want to add hashing:
// class Circle {
-// public:
-// ...
-// private:
-// std::pair<int, int> center_;
-// int radius_;
-// };
+// public:
+// ...
+// private:
+// std::pair<int, int> center_;
+// int radius_;
+// };
//
-// // To add hashing support to `Circle`, we simply need to add an ordinary
-// // function `AbslHashValue()`, and return the combined hash state of the
-// // existing hash state and the class state:
-//
+// // To add hashing support to `Circle`, we simply need to add a free
+// // (non-member) function `AbslHashValue()`, and return the combined hash
+// // state of the existing hash state and the class state. You can add such a
+// // free function using a friend declaration within the body of the class:
+// class Circle {
+// public:
+// ...
// template <typename H>
// friend H AbslHashValue(H h, const Circle& c) {
// return H::combine(std::move(h), c.center_, c.radius_);
// }
+// ...
+// };
//
// For more information, see Adding Type Support to `absl::Hash` below.
//
@@ -239,7 +244,7 @@
// }
// private:
// virtual void HashValue(absl::HashState state) const = 0;
-// };
+// };
//
// class Impl : Interface {
// private:
diff --git a/absl/strings/str_cat.h b/absl/strings/str_cat.h
index cba8ceb..559ee0a 100644
--- a/absl/strings/str_cat.h
+++ b/absl/strings/str_cat.h
@@ -56,6 +56,7 @@
#include <cstdint>
#include <string>
#include <type_traits>
+#include <vector>
#include "absl/base/port.h"
#include "absl/strings/numbers.h"
@@ -268,6 +269,17 @@
AlphaNum(T e) // NOLINT(runtime/explicit)
: AlphaNum(static_cast<typename std::underlying_type<T>::type>(e)) {}
+ // vector<bool>::reference and const_reference require special help to
+ // convert to `AlphaNum` because it requires two user defined conversions.
+ template <
+ typename T,
+ typename std::enable_if<
+ std::is_class<T>::value &&
+ (std::is_same<T, std::vector<bool>::reference>::value ||
+ std::is_same<T, std::vector<bool>::const_reference>::value)>::type* =
+ nullptr>
+ AlphaNum(T e) : AlphaNum(static_cast<bool>(e)) {} // NOLINT(runtime/explicit)
+
private:
absl::string_view piece_;
char digits_[numbers_internal::kFastToBufferSize];
diff --git a/absl/strings/str_cat_test.cc b/absl/strings/str_cat_test.cc
index beb15fa..1f1051d 100644
--- a/absl/strings/str_cat_test.cc
+++ b/absl/strings/str_cat_test.cc
@@ -18,6 +18,7 @@
#include <cstdint>
#include <string>
+#include <vector>
#include "gtest/gtest.h"
#include "absl/strings/substitute.h"
@@ -395,6 +396,18 @@
"No limit thanks to C++11's variadic templates");
}
+TEST(StrCat, VectorBoolReferenceTypes) {
+ std::vector<bool> v;
+ v.push_back(true);
+ v.push_back(false);
+ std::vector<bool> const& cv = v;
+ // Test that vector<bool>::reference and vector<bool>::const_reference
+ // are handled as if the were really bool types and not the proxy types
+ // they really are.
+ std::string result = absl::StrCat(v[0], v[1], cv[0], cv[1]); // NOLINT
+ EXPECT_EQ(result, "1010");
+}
+
#ifdef GTEST_HAS_DEATH_TEST
TEST(StrAppend, Death) {
std::string s = "self";
diff --git a/absl/types/optional.h b/absl/types/optional.h
index 5798331..1670022 100644
--- a/absl/types/optional.h
+++ b/absl/types/optional.h
@@ -507,7 +507,7 @@
template <typename U>
T value_or(U&& v) && { // NOLINT(build/c++11)
static_assert(std::is_move_constructible<value_type>::value,
- "optional<T>::value_or: T must by copy constructible");
+ "optional<T>::value_or: T must by move constructible");
static_assert(std::is_convertible<U&&, value_type>::value,
"optional<T>::value_or: U must be convertible to T");
return static_cast<bool>(*this) ? std::move(**this)
