tools/aapt2/cmd/Util.cpp - platform/frameworks/base - Git at Google

 /*
  * Copyright (C) 2017 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.
  */

 #include "cmd/Util.h"

 #include <vector>

 #include "android-base/logging.h"

 #include "ConfigDescription.h"
 #include "Locale.h"
 #include "ResourceUtils.h"
 #include "ValueVisitor.h"
 #include "split/TableSplitter.h"
 #include "util/Maybe.h"
 #include "util/Util.h"

 using ::android::StringPiece;

 namespace aapt {

 Maybe<uint16_t> ParseTargetDensityParameter(const StringPiece& arg, IDiagnostics* diag) {
   ConfigDescription preferred_density_config;
   if (!ConfigDescription::Parse(arg, &preferred_density_config)) {
     diag->Error(DiagMessage() << "invalid density '" << arg << "' for --preferred-density option");
     return {};
   }

   // Clear the version that can be automatically added.
   preferred_density_config.sdkVersion = 0;

   if (preferred_density_config.diff(ConfigDescription::DefaultConfig()) !=
       ConfigDescription::CONFIG_DENSITY) {
     diag->Error(DiagMessage() << "invalid preferred density '" << arg << "'. "
                               << "Preferred density must only be a density value");
     return {};
   }
   return preferred_density_config.density;
 }

 bool ParseSplitParameter(const StringPiece& arg, IDiagnostics* diag, std::string* out_path,
                          SplitConstraints* out_split) {
   CHECK(diag != nullptr);
   CHECK(out_path != nullptr);
   CHECK(out_split != nullptr);

 #ifdef _WIN32
   const char sSeparator = ';';
 #else
   const char sSeparator = ':';
 #endif

   std::vector<std::string> parts = util::Split(arg, sSeparator);
   if (parts.size() != 2) {
     diag->Error(DiagMessage() << "invalid split parameter '" << arg << "'");
     diag->Note(DiagMessage() << "should be --split path/to/output.apk" << sSeparator
                              << "<config>[,<config>...].");
     return false;
   }

   *out_path = parts[0];
   std::vector<ConfigDescription> configs;
   for (const StringPiece& config_str : util::Tokenize(parts[1], ',')) {
     ConfigDescription config;
     if (!ConfigDescription::Parse(config_str, &config)) {
       diag->Error(DiagMessage() << "invalid config '" << config_str << "' in split parameter '"
                                 << arg << "'");
       return false;
     }
     out_split->configs.insert(config);
   }
   return true;
 }

 std::unique_ptr<IConfigFilter> ParseConfigFilterParameters(const std::vector<std::string>& args,
                                                            IDiagnostics* diag) {
   std::unique_ptr<AxisConfigFilter> filter = util::make_unique<AxisConfigFilter>();
   for (const std::string& config_arg : args) {
     for (const StringPiece& config_str : util::Tokenize(config_arg, ',')) {
       ConfigDescription config;
       LocaleValue lv;
       if (lv.InitFromFilterString(config_str)) {
         lv.WriteTo(&config);
       } else if (!ConfigDescription::Parse(config_str, &config)) {
         diag->Error(DiagMessage() << "invalid config '" << config_str << "' for -c option");
         return {};
       }

       if (config.density != 0) {
         diag->Warn(DiagMessage() << "ignoring density '" << config << "' for -c option");
       } else {
         filter->AddConfig(config);
       }
     }
   }
   return std::move(filter);
 }

 // Adjust the SplitConstraints so that their SDK version is stripped if it
 // is less than or equal to the minSdk. Otherwise the resources that have had
 // their SDK version stripped due to minSdk won't ever match.
 std::vector<SplitConstraints> AdjustSplitConstraintsForMinSdk(
     int min_sdk, const std::vector<SplitConstraints>& split_constraints) {
   std::vector<SplitConstraints> adjusted_constraints;
   adjusted_constraints.reserve(split_constraints.size());
   for (const SplitConstraints& constraints : split_constraints) {
     SplitConstraints constraint;
     for (const ConfigDescription& config : constraints.configs) {
       if (config.sdkVersion <= min_sdk) {
         constraint.configs.insert(config.CopyWithoutSdkVersion());
       } else {
         constraint.configs.insert(config);
       }
     }
     adjusted_constraints.push_back(std::move(constraint));
   }
   return adjusted_constraints;
 }

 static xml::AaptAttribute CreateAttributeWithId(const ResourceId& id) {
   return xml::AaptAttribute(Attribute(), id);
 }

 static xml::NamespaceDecl CreateAndroidNamespaceDecl() {
   xml::NamespaceDecl decl;
   decl.prefix = "android";
   decl.uri = xml::kSchemaAndroid;
   return decl;
 }

 std::unique_ptr<xml::XmlResource> GenerateSplitManifest(const AppInfo& app_info,
                                                         const SplitConstraints& constraints) {
   const ResourceId kVersionCode(0x0101021b);
   const ResourceId kRevisionCode(0x010104d5);
   const ResourceId kHasCode(0x0101000c);

   std::unique_ptr<xml::Element> manifest_el = util::make_unique<xml::Element>();
   manifest_el->namespace_decls.push_back(CreateAndroidNamespaceDecl());
   manifest_el->name = "manifest";
   manifest_el->attributes.push_back(xml::Attribute{"", "package", app_info.package});

   if (app_info.version_code) {
     const uint32_t version_code = app_info.version_code.value();
     manifest_el->attributes.push_back(xml::Attribute{
         xml::kSchemaAndroid, "versionCode", std::to_string(version_code),
         CreateAttributeWithId(kVersionCode),
         util::make_unique<BinaryPrimitive>(android::Res_value::TYPE_INT_DEC, version_code)});
   }

   if (app_info.revision_code) {
     const uint32_t revision_code = app_info.revision_code.value();
     manifest_el->attributes.push_back(xml::Attribute{
         xml::kSchemaAndroid, "revisionCode", std::to_string(revision_code),
         CreateAttributeWithId(kRevisionCode),
         util::make_unique<BinaryPrimitive>(android::Res_value::TYPE_INT_DEC, revision_code)});
   }

   std::stringstream split_name;
   if (app_info.split_name) {
     split_name << app_info.split_name.value() << ".";
   }
   split_name << "config." << util::Joiner(constraints.configs, "_");

   manifest_el->attributes.push_back(xml::Attribute{"", "split", split_name.str()});

   if (app_info.split_name) {
     manifest_el->attributes.push_back(
         xml::Attribute{"", "configForSplit", app_info.split_name.value()});
   }

   // Splits may contain more configurations than originally desired (fall-back densities, etc.).
   // This makes programmatic discovery of split targeting difficult. Encode the original
   // split constraints intended for this split.
   std::stringstream target_config_str;
   target_config_str << util::Joiner(constraints.configs, ",");
   manifest_el->attributes.push_back(xml::Attribute{"", "targetConfig", target_config_str.str()});

   std::unique_ptr<xml::Element> application_el = util::make_unique<xml::Element>();
   application_el->name = "application";
   application_el->attributes.push_back(
       xml::Attribute{xml::kSchemaAndroid, "hasCode", "false", CreateAttributeWithId(kHasCode),
                      util::make_unique<BinaryPrimitive>(android::Res_value::TYPE_INT_BOOLEAN, 0u)});

   manifest_el->AppendChild(std::move(application_el));

   std::unique_ptr<xml::XmlResource> doc = util::make_unique<xml::XmlResource>();
   doc->root = std::move(manifest_el);
   return doc;
 }

 static Maybe<std::string> ExtractCompiledString(xml::Attribute* attr, std::string* out_error) {
   if (attr->compiled_value != nullptr) {
     String* compiled_str = ValueCast<String>(attr->compiled_value.get());
     if (compiled_str != nullptr) {
       if (!compiled_str->value->empty()) {
         return *compiled_str->value;
       } else {
         *out_error = "compiled value is an empty string";
         return {};
       }
     }
     *out_error = "compiled value is not a string";
     return {};
   }

   // Fallback to the plain text value if there is one.
   if (!attr->value.empty()) {
     return attr->value;
   }
   *out_error = "value is an empty string";
   return {};
 }

 static Maybe<uint32_t> ExtractCompiledInt(xml::Attribute* attr, std::string* out_error) {
   if (attr->compiled_value != nullptr) {
     BinaryPrimitive* compiled_prim = ValueCast<BinaryPrimitive>(attr->compiled_value.get());
     if (compiled_prim != nullptr) {
       if (compiled_prim->value.dataType >= android::Res_value::TYPE_FIRST_INT &&
           compiled_prim->value.dataType <= android::Res_value::TYPE_LAST_INT) {
         return compiled_prim->value.data;
       }
     }
     *out_error = "compiled value is not an integer";
     return {};
   }

   // Fallback to the plain text value if there is one.
   Maybe<uint32_t> integer = ResourceUtils::ParseInt(attr->value);
   if (integer) {
     return integer;
   }
   std::stringstream error_msg;
   error_msg << "'" << attr->value << "' is not a valid integer";
   *out_error = error_msg.str();
   return {};
 }

 static Maybe<int> ExtractSdkVersion(xml::Attribute* attr, std::string* out_error) {
   if (attr->compiled_value != nullptr) {
     BinaryPrimitive* compiled_prim = ValueCast<BinaryPrimitive>(attr->compiled_value.get());
     if (compiled_prim != nullptr) {
       if (compiled_prim->value.dataType >= android::Res_value::TYPE_FIRST_INT &&
           compiled_prim->value.dataType <= android::Res_value::TYPE_LAST_INT) {
         return compiled_prim->value.data;
       }
       *out_error = "compiled value is not an integer or string";
       return {};
     }

     String* compiled_str = ValueCast<String>(attr->compiled_value.get());
     if (compiled_str != nullptr) {
       Maybe<int> sdk_version = ResourceUtils::ParseSdkVersion(*compiled_str->value);
       if (sdk_version) {
         return sdk_version;
       }

       *out_error = "compiled string value is not a valid SDK version";
       return {};
     }
     *out_error = "compiled value is not an integer or string";
     return {};
   }

   // Fallback to the plain text value if there is one.
   Maybe<int> sdk_version = ResourceUtils::ParseSdkVersion(attr->value);
   if (sdk_version) {
     return sdk_version;
   }
   std::stringstream error_msg;
   error_msg << "'" << attr->value << "' is not a valid SDK version";
   *out_error = error_msg.str();
   return {};
 }

 Maybe<AppInfo> ExtractAppInfoFromBinaryManifest(xml::XmlResource* xml_res, IDiagnostics* diag) {
   // Make sure the first element is <manifest> with package attribute.
   xml::Element* manifest_el = xml_res->root.get();
   if (manifest_el == nullptr) {
     return {};
   }

   AppInfo app_info;

   if (!manifest_el->namespace_uri.empty() || manifest_el->name != "manifest") {
     diag->Error(DiagMessage(xml_res->file.source) << "root tag must be <manifest>");
     return {};
   }

   xml::Attribute* package_attr = manifest_el->FindAttribute({}, "package");
   if (!package_attr) {
     diag->Error(DiagMessage(xml_res->file.source) << "<manifest> must have a 'package' attribute");
     return {};
   }

   std::string error_msg;
   Maybe<std::string> maybe_package = ExtractCompiledString(package_attr, &error_msg);
   if (!maybe_package) {
     diag->Error(DiagMessage(xml_res->file.source.WithLine(manifest_el->line_number))
                 << "invalid package name: " << error_msg);
     return {};
   }
   app_info.package = maybe_package.value();

   if (xml::Attribute* version_code_attr =
           manifest_el->FindAttribute(xml::kSchemaAndroid, "versionCode")) {
     Maybe<uint32_t> maybe_code = ExtractCompiledInt(version_code_attr, &error_msg);
     if (!maybe_code) {
       diag->Error(DiagMessage(xml_res->file.source.WithLine(manifest_el->line_number))
                   << "invalid android:versionCode: " << error_msg);
       return {};
     }
     app_info.version_code = maybe_code.value();
   }

   if (xml::Attribute* revision_code_attr =
           manifest_el->FindAttribute(xml::kSchemaAndroid, "revisionCode")) {
     Maybe<uint32_t> maybe_code = ExtractCompiledInt(revision_code_attr, &error_msg);
     if (!maybe_code) {
       diag->Error(DiagMessage(xml_res->file.source.WithLine(manifest_el->line_number))
                   << "invalid android:revisionCode: " << error_msg);
       return {};
     }
     app_info.revision_code = maybe_code.value();
   }

   if (xml::Attribute* split_name_attr = manifest_el->FindAttribute({}, "split")) {
     Maybe<std::string> maybe_split_name = ExtractCompiledString(split_name_attr, &error_msg);
     if (!maybe_split_name) {
       diag->Error(DiagMessage(xml_res->file.source.WithLine(manifest_el->line_number))
                   << "invalid split name: " << error_msg);
       return {};
     }
     app_info.split_name = maybe_split_name.value();
   }

   if (xml::Element* uses_sdk_el = manifest_el->FindChild({}, "uses-sdk")) {
     if (xml::Attribute* min_sdk =
             uses_sdk_el->FindAttribute(xml::kSchemaAndroid, "minSdkVersion")) {
       Maybe<int> maybe_sdk = ExtractSdkVersion(min_sdk, &error_msg);
       if (!maybe_sdk) {
         diag->Error(DiagMessage(xml_res->file.source.WithLine(uses_sdk_el->line_number))
                     << "invalid android:minSdkVersion: " << error_msg);
         return {};
       }
       app_info.min_sdk_version = maybe_sdk.value();
     }
   }
   return app_info;
 }

 }  // namespace aapt
	/*
	* Copyright (C) 2017 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.
	*/

	#include "cmd/Util.h"

	#include <vector>

	#include "android-base/logging.h"

	#include "ConfigDescription.h"
	#include "Locale.h"
	#include "ResourceUtils.h"
	#include "ValueVisitor.h"
	#include "split/TableSplitter.h"
	#include "util/Maybe.h"
	#include "util/Util.h"

	using ::android::StringPiece;

	namespace aapt {

	Maybe<uint16_t> ParseTargetDensityParameter(const StringPiece& arg, IDiagnostics* diag) {
	ConfigDescription preferred_density_config;
	if (!ConfigDescription::Parse(arg, &preferred_density_config)) {
	diag->Error(DiagMessage() << "invalid density '" << arg << "' for --preferred-density option");
	return {};
	}

	// Clear the version that can be automatically added.
	preferred_density_config.sdkVersion = 0;

	if (preferred_density_config.diff(ConfigDescription::DefaultConfig()) !=
	ConfigDescription::CONFIG_DENSITY) {
	diag->Error(DiagMessage() << "invalid preferred density '" << arg << "'. "
	<< "Preferred density must only be a density value");
	return {};
	}
	return preferred_density_config.density;
	}

	bool ParseSplitParameter(const StringPiece& arg, IDiagnostics* diag, std::string* out_path,
	SplitConstraints* out_split) {
	CHECK(diag != nullptr);
	CHECK(out_path != nullptr);
	CHECK(out_split != nullptr);

	#ifdef _WIN32
	const char sSeparator = ';';
	#else
	const char sSeparator = ':';
	#endif

	std::vector<std::string> parts = util::Split(arg, sSeparator);
	if (parts.size() != 2) {
	diag->Error(DiagMessage() << "invalid split parameter '" << arg << "'");
	diag->Note(DiagMessage() << "should be --split path/to/output.apk" << sSeparator
	<< "<config>[,<config>...].");
	return false;
	}

	*out_path = parts[0];
	std::vector<ConfigDescription> configs;
	for (const StringPiece& config_str : util::Tokenize(parts[1], ',')) {
	ConfigDescription config;
	if (!ConfigDescription::Parse(config_str, &config)) {
	diag->Error(DiagMessage() << "invalid config '" << config_str << "' in split parameter '"
	<< arg << "'");
	return false;
	}
	out_split->configs.insert(config);
	}
	return true;
	}

	std::unique_ptr<IConfigFilter> ParseConfigFilterParameters(const std::vector<std::string>& args,
	IDiagnostics* diag) {
	std::unique_ptr<AxisConfigFilter> filter = util::make_unique<AxisConfigFilter>();
	for (const std::string& config_arg : args) {
	for (const StringPiece& config_str : util::Tokenize(config_arg, ',')) {
	ConfigDescription config;
	LocaleValue lv;
	if (lv.InitFromFilterString(config_str)) {
	lv.WriteTo(&config);
	} else if (!ConfigDescription::Parse(config_str, &config)) {
	diag->Error(DiagMessage() << "invalid config '" << config_str << "' for -c option");
	return {};
	}

	if (config.density != 0) {
	diag->Warn(DiagMessage() << "ignoring density '" << config << "' for -c option");
	} else {
	filter->AddConfig(config);
	}
	}
	}
	return std::move(filter);
	}

	// Adjust the SplitConstraints so that their SDK version is stripped if it
	// is less than or equal to the minSdk. Otherwise the resources that have had
	// their SDK version stripped due to minSdk won't ever match.
	std::vector<SplitConstraints> AdjustSplitConstraintsForMinSdk(
	int min_sdk, const std::vector<SplitConstraints>& split_constraints) {
	std::vector<SplitConstraints> adjusted_constraints;
	adjusted_constraints.reserve(split_constraints.size());
	for (const SplitConstraints& constraints : split_constraints) {
	SplitConstraints constraint;
	for (const ConfigDescription& config : constraints.configs) {
	if (config.sdkVersion <= min_sdk) {
	constraint.configs.insert(config.CopyWithoutSdkVersion());
	} else {
	constraint.configs.insert(config);
	}
	}
	adjusted_constraints.push_back(std::move(constraint));
	}
	return adjusted_constraints;
	}

	static xml::AaptAttribute CreateAttributeWithId(const ResourceId& id) {
	return xml::AaptAttribute(Attribute(), id);
	}

	static xml::NamespaceDecl CreateAndroidNamespaceDecl() {
	xml::NamespaceDecl decl;
	decl.prefix = "android";
	decl.uri = xml::kSchemaAndroid;
	return decl;
	}

	std::unique_ptr<xml::XmlResource> GenerateSplitManifest(const AppInfo& app_info,
	const SplitConstraints& constraints) {
	const ResourceId kVersionCode(0x0101021b);
	const ResourceId kRevisionCode(0x010104d5);
	const ResourceId kHasCode(0x0101000c);

	std::unique_ptr<xml::Element> manifest_el = util::make_unique<xml::Element>();
	manifest_el->namespace_decls.push_back(CreateAndroidNamespaceDecl());
	manifest_el->name = "manifest";
	manifest_el->attributes.push_back(xml::Attribute{"", "package", app_info.package});

	if (app_info.version_code) {
	const uint32_t version_code = app_info.version_code.value();
	manifest_el->attributes.push_back(xml::Attribute{
	xml::kSchemaAndroid, "versionCode", std::to_string(version_code),
	CreateAttributeWithId(kVersionCode),
	util::make_unique<BinaryPrimitive>(android::Res_value::TYPE_INT_DEC, version_code)});
	}

	if (app_info.revision_code) {
	const uint32_t revision_code = app_info.revision_code.value();
	manifest_el->attributes.push_back(xml::Attribute{
	xml::kSchemaAndroid, "revisionCode", std::to_string(revision_code),
	CreateAttributeWithId(kRevisionCode),
	util::make_unique<BinaryPrimitive>(android::Res_value::TYPE_INT_DEC, revision_code)});
	}

	std::stringstream split_name;
	if (app_info.split_name) {
	split_name << app_info.split_name.value() << ".";
	}
	split_name << "config." << util::Joiner(constraints.configs, "_");

	manifest_el->attributes.push_back(xml::Attribute{"", "split", split_name.str()});

	if (app_info.split_name) {
	manifest_el->attributes.push_back(
	xml::Attribute{"", "configForSplit", app_info.split_name.value()});
	}

	// Splits may contain more configurations than originally desired (fall-back densities, etc.).
	// This makes programmatic discovery of split targeting difficult. Encode the original
	// split constraints intended for this split.
	std::stringstream target_config_str;
	target_config_str << util::Joiner(constraints.configs, ",");
	manifest_el->attributes.push_back(xml::Attribute{"", "targetConfig", target_config_str.str()});

	std::unique_ptr<xml::Element> application_el = util::make_unique<xml::Element>();
	application_el->name = "application";
	application_el->attributes.push_back(
	xml::Attribute{xml::kSchemaAndroid, "hasCode", "false", CreateAttributeWithId(kHasCode),
	util::make_unique<BinaryPrimitive>(android::Res_value::TYPE_INT_BOOLEAN, 0u)});

	manifest_el->AppendChild(std::move(application_el));

	std::unique_ptr<xml::XmlResource> doc = util::make_unique<xml::XmlResource>();
	doc->root = std::move(manifest_el);
	return doc;
	}

	static Maybe<std::string> ExtractCompiledString(xml::Attribute* attr, std::string* out_error) {
	if (attr->compiled_value != nullptr) {
	String* compiled_str = ValueCast<String>(attr->compiled_value.get());
	if (compiled_str != nullptr) {
	if (!compiled_str->value->empty()) {
	return *compiled_str->value;
	} else {
	*out_error = "compiled value is an empty string";
	return {};
	}
	}
	*out_error = "compiled value is not a string";
	return {};
	}

	// Fallback to the plain text value if there is one.
	if (!attr->value.empty()) {
	return attr->value;
	}
	*out_error = "value is an empty string";
	return {};
	}

	static Maybe<uint32_t> ExtractCompiledInt(xml::Attribute* attr, std::string* out_error) {
	if (attr->compiled_value != nullptr) {
	BinaryPrimitive* compiled_prim = ValueCast<BinaryPrimitive>(attr->compiled_value.get());
	if (compiled_prim != nullptr) {
	if (compiled_prim->value.dataType >= android::Res_value::TYPE_FIRST_INT &&
	compiled_prim->value.dataType <= android::Res_value::TYPE_LAST_INT) {
	return compiled_prim->value.data;
	}
	}
	*out_error = "compiled value is not an integer";
	return {};
	}

	// Fallback to the plain text value if there is one.
	Maybe<uint32_t> integer = ResourceUtils::ParseInt(attr->value);
	if (integer) {
	return integer;
	}
	std::stringstream error_msg;
	error_msg << "'" << attr->value << "' is not a valid integer";
	*out_error = error_msg.str();
	return {};
	}

	static Maybe<int> ExtractSdkVersion(xml::Attribute* attr, std::string* out_error) {
	if (attr->compiled_value != nullptr) {
	BinaryPrimitive* compiled_prim = ValueCast<BinaryPrimitive>(attr->compiled_value.get());
	if (compiled_prim != nullptr) {
	if (compiled_prim->value.dataType >= android::Res_value::TYPE_FIRST_INT &&
	compiled_prim->value.dataType <= android::Res_value::TYPE_LAST_INT) {
	return compiled_prim->value.data;
	}
	*out_error = "compiled value is not an integer or string";
	return {};
	}

	String* compiled_str = ValueCast<String>(attr->compiled_value.get());
	if (compiled_str != nullptr) {
	Maybe<int> sdk_version = ResourceUtils::ParseSdkVersion(*compiled_str->value);
	if (sdk_version) {
	return sdk_version;
	}

	*out_error = "compiled string value is not a valid SDK version";
	return {};
	}
	*out_error = "compiled value is not an integer or string";
	return {};
	}

	// Fallback to the plain text value if there is one.
	Maybe<int> sdk_version = ResourceUtils::ParseSdkVersion(attr->value);
	if (sdk_version) {
	return sdk_version;
	}
	std::stringstream error_msg;
	error_msg << "'" << attr->value << "' is not a valid SDK version";
	*out_error = error_msg.str();
	return {};
	}

	Maybe<AppInfo> ExtractAppInfoFromBinaryManifest(xml::XmlResource* xml_res, IDiagnostics* diag) {
	// Make sure the first element is <manifest> with package attribute.
	xml::Element* manifest_el = xml_res->root.get();
	if (manifest_el == nullptr) {
	return {};
	}

	AppInfo app_info;

	if (!manifest_el->namespace_uri.empty() \|\| manifest_el->name != "manifest") {
	diag->Error(DiagMessage(xml_res->file.source) << "root tag must be <manifest>");
	return {};
	}

	xml::Attribute* package_attr = manifest_el->FindAttribute({}, "package");
	if (!package_attr) {
	diag->Error(DiagMessage(xml_res->file.source) << "<manifest> must have a 'package' attribute");
	return {};
	}

	std::string error_msg;
	Maybe<std::string> maybe_package = ExtractCompiledString(package_attr, &error_msg);
	if (!maybe_package) {
	diag->Error(DiagMessage(xml_res->file.source.WithLine(manifest_el->line_number))
	<< "invalid package name: " << error_msg);
	return {};
	}
	app_info.package = maybe_package.value();

	if (xml::Attribute* version_code_attr =
	manifest_el->FindAttribute(xml::kSchemaAndroid, "versionCode")) {
	Maybe<uint32_t> maybe_code = ExtractCompiledInt(version_code_attr, &error_msg);
	if (!maybe_code) {
	diag->Error(DiagMessage(xml_res->file.source.WithLine(manifest_el->line_number))
	<< "invalid android:versionCode: " << error_msg);
	return {};
	}
	app_info.version_code = maybe_code.value();
	}

	if (xml::Attribute* revision_code_attr =
	manifest_el->FindAttribute(xml::kSchemaAndroid, "revisionCode")) {
	Maybe<uint32_t> maybe_code = ExtractCompiledInt(revision_code_attr, &error_msg);
	if (!maybe_code) {
	diag->Error(DiagMessage(xml_res->file.source.WithLine(manifest_el->line_number))
	<< "invalid android:revisionCode: " << error_msg);
	return {};
	}
	app_info.revision_code = maybe_code.value();
	}

	if (xml::Attribute* split_name_attr = manifest_el->FindAttribute({}, "split")) {
	Maybe<std::string> maybe_split_name = ExtractCompiledString(split_name_attr, &error_msg);
	if (!maybe_split_name) {
	diag->Error(DiagMessage(xml_res->file.source.WithLine(manifest_el->line_number))
	<< "invalid split name: " << error_msg);
	return {};
	}
	app_info.split_name = maybe_split_name.value();
	}

	if (xml::Element* uses_sdk_el = manifest_el->FindChild({}, "uses-sdk")) {
	if (xml::Attribute* min_sdk =
	uses_sdk_el->FindAttribute(xml::kSchemaAndroid, "minSdkVersion")) {
	Maybe<int> maybe_sdk = ExtractSdkVersion(min_sdk, &error_msg);
	if (!maybe_sdk) {
	diag->Error(DiagMessage(xml_res->file.source.WithLine(uses_sdk_el->line_number))
	<< "invalid android:minSdkVersion: " << error_msg);
	return {};
	}
	app_info.min_sdk_version = maybe_sdk.value();
	}
	}
	return app_info;
	}

	} // namespace aapt