| /* |
| * Copyright (C) 2015 The Android Open Source Project |
| * |
| * 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 |
| * |
| * http://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 ART_CMDLINE_CMDLINE_TYPE_PARSER_H_ |
| #define ART_CMDLINE_CMDLINE_TYPE_PARSER_H_ |
| |
| #include "cmdline_parse_result.h" |
| |
| namespace art { |
| |
| // Base class for user-defined CmdlineType<T> specializations. |
| // |
| // Not strictly necessary, but if the specializations fail to Define all of these functions |
| // the compilation will fail. |
| template <typename T> |
| struct CmdlineTypeParser { |
| // Return value of parsing attempts. Represents a Success(T value) or an Error(int code) |
| using Result = CmdlineParseResult<T>; |
| |
| // Parse a single value for an argument definition out of the wildcard component. |
| // |
| // e.g. if the argument definition was "foo:_", and the user-provided input was "foo:bar", |
| // then args is "bar". |
| Result Parse(const std::string& args ATTRIBUTE_UNUSED) { |
| assert(false); |
| return Result::Failure("Missing type specialization and/or value map"); |
| } |
| |
| // Parse a value and append it into the existing value so far, for argument |
| // definitions which are marked with AppendValues(). |
| // |
| // The value is parsed out of the wildcard component as in Parse. |
| // |
| // If the initial value does not exist yet, a default value is created by |
| // value-initializing with 'T()'. |
| Result ParseAndAppend(const std::string& args ATTRIBUTE_UNUSED, |
| T& existing_value ATTRIBUTE_UNUSED) { |
| assert(false); |
| return Result::Failure("Missing type specialization and/or value map"); |
| } |
| |
| // Runtime type name of T, so that we can print more useful error messages. |
| static const char* Name() { assert(false); return "UnspecializedType"; } |
| static const char* DescribeType() { assert(false); return "UnspecializedType"; } |
| |
| // Whether or not your type can parse argument definitions defined without a "_" |
| // e.g. -Xenable-profiler just mutates the existing profiler struct in-place |
| // so it doesn't need to do any parsing other than token recognition. |
| // |
| // If this is false, then either the argument definition has a _, from which the parsing |
| // happens, or the tokens get mapped to a value list/map from which a 1:1 matching occurs. |
| // |
| // This should almost *always* be false! |
| static constexpr bool kCanParseBlankless = false; |
| |
| protected: |
| // Don't accidentally initialize instances of this directly; they will assert at runtime. |
| CmdlineTypeParser() = default; |
| }; |
| |
| |
| } // namespace art |
| |
| #endif // ART_CMDLINE_CMDLINE_TYPE_PARSER_H_ |