tools/aapt2/configuration/ConfigurationParser.cpp - platform/frameworks/base - Gitiles

 /*
  * 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 "configuration/ConfigurationParser.h"

 #include <algorithm>
 #include <functional>
 #include <map>
 #include <memory>
 #include <utility>

 #include <android-base/file.h>
 #include <android-base/logging.h>

 #include "ConfigDescription.h"
 #include "Diagnostics.h"
 #include "io/File.h"
 #include "io/FileSystem.h"
 #include "util/Maybe.h"
 #include "util/Util.h"
 #include "xml/XmlActionExecutor.h"
 #include "xml/XmlDom.h"
 #include "xml/XmlUtil.h"

 namespace aapt {

 namespace {

 using ::aapt::configuration::Abi;
 using ::aapt::configuration::AndroidManifest;
 using ::aapt::configuration::AndroidSdk;
 using ::aapt::configuration::Artifact;
 using ::aapt::configuration::PostProcessingConfiguration;
 using ::aapt::configuration::GlTexture;
 using ::aapt::configuration::Group;
 using ::aapt::configuration::Locale;
 using ::aapt::io::IFile;
 using ::aapt::io::RegularFile;
 using ::aapt::util::TrimWhitespace;
 using ::aapt::xml::Element;
 using ::aapt::xml::FindRootElement;
 using ::aapt::xml::NodeCast;
 using ::aapt::xml::XmlActionExecutor;
 using ::aapt::xml::XmlActionExecutorPolicy;
 using ::aapt::xml::XmlNodeAction;
 using ::android::base::ReadFileToString;

 const std::unordered_map<std::string, Abi> kStringToAbiMap = {
     {"armeabi", Abi::kArmeV6}, {"armeabi-v7a", Abi::kArmV7a},  {"arm64-v8a", Abi::kArm64V8a},
     {"x86", Abi::kX86},        {"x86_64", Abi::kX86_64},       {"mips", Abi::kMips},
     {"mips64", Abi::kMips64},  {"universal", Abi::kUniversal},
 };
 const std::map<Abi, std::string> kAbiToStringMap = {
     {Abi::kArmeV6, "armeabi"}, {Abi::kArmV7a, "armeabi-v7a"},  {Abi::kArm64V8a, "arm64-v8a"},
     {Abi::kX86, "x86"},        {Abi::kX86_64, "x86_64"},       {Abi::kMips, "mips"},
     {Abi::kMips64, "mips64"},  {Abi::kUniversal, "universal"},
 };

 constexpr const char* kAaptXmlNs = "http://schemas.android.com/tools/aapt";

 /** A default noop diagnostics context. */
 class NoopDiagnostics : public IDiagnostics {
  public:
   void Log(Level level, DiagMessageActual& actualMsg) override {}
 };
 NoopDiagnostics noop_;

 std::string GetLabel(const Element* element, IDiagnostics* diag) {
   std::string label;
   for (const auto& attr : element->attributes) {
     if (attr.name == "label") {
       label = attr.value;
       break;
     }
   }

   if (label.empty()) {
     diag->Error(DiagMessage() << "No label found for element " << element->name);
   }
   return label;
 }

 /** XML node visitor that removes all of the namespace URIs from the node and all children. */
 class NamespaceVisitor : public xml::Visitor {
  public:
   void Visit(xml::Element* node) override {
     node->namespace_uri.clear();
     VisitChildren(node);
   }
 };

 }  // namespace

 namespace configuration {

 const std::string& AbiToString(Abi abi) {
   return kAbiToStringMap.find(abi)->second;
 }

 /**
  * Attempts to replace the placeholder in the name string with the provided value. Returns true on
  * success, or false if the either the placeholder is not found in the name, or the value is not
  * present and the placeholder was.
  */
 static bool ReplacePlaceholder(const std::string& placeholder, const Maybe<std::string>& value,
                                std::string* name, IDiagnostics* diag) {
   size_t offset = name->find(placeholder);
   if (value) {
     if (offset == std::string::npos) {
       diag->Error(DiagMessage() << "Missing placeholder for artifact: " << placeholder);
       return false;
     }
     name->replace(offset, placeholder.length(), value.value());
     return true;
   }

   // Make sure the placeholder was not present if the desired value was not present.
   bool result = (offset == std::string::npos);
   if (!result) {
     diag->Error(DiagMessage() << "Placeholder present but no value for artifact: " << placeholder);
   }
   return result;
 }

 Maybe<std::string> Artifact::ToArtifactName(const std::string& format, IDiagnostics* diag) const {
   std::string result = format;

   if (!ReplacePlaceholder("{abi}", abi_group, &result, diag)) {
     return {};
   }

   if (!ReplacePlaceholder("{density}", screen_density_group, &result, diag)) {
     return {};
   }

   if (!ReplacePlaceholder("{locale}", locale_group, &result, diag)) {
     return {};
   }

   if (!ReplacePlaceholder("{sdk}", android_sdk_group, &result, diag)) {
     return {};
   }

   if (!ReplacePlaceholder("{feature}", device_feature_group, &result, diag)) {
     return {};
   }

   if (!ReplacePlaceholder("{gl}", gl_texture_group, &result, diag)) {
     return {};
   }

   return result;
 }

 }  // namespace configuration

 /** Returns a ConfigurationParser for the file located at the provided path. */
 Maybe<ConfigurationParser> ConfigurationParser::ForPath(const std::string& path) {
   std::string contents;
   if (!ReadFileToString(path, &contents, true)) {
     return {};
   }
   return ConfigurationParser(contents);
 }

 ConfigurationParser::ConfigurationParser(std::string contents)
     : contents_(std::move(contents)),
       diag_(&noop_) {
 }

 Maybe<PostProcessingConfiguration> ConfigurationParser::Parse() {
   std::istringstream in(contents_);

   auto doc = xml::Inflate(&in, diag_, Source("config.xml"));
   if (!doc) {
     return {};
   }

   // Strip any namespaces from the XML as the XmlActionExecutor ignores anything with a namespace.
   auto* root = FindRootElement(doc.get());
   if (root == nullptr) {
     diag_->Error(DiagMessage() << "Could not find the root element in the XML document");
     return {};
   }

   std::string& xml_ns = root->namespace_uri;
   if (!xml_ns.empty()) {
     if (xml_ns != kAaptXmlNs) {
       diag_->Error(DiagMessage() << "Unknown namespace found on root element: " << xml_ns);
       return {};
     }

     xml_ns.clear();
     NamespaceVisitor visitor;
     root->Accept(&visitor);
   }

   XmlActionExecutor executor;
   XmlNodeAction& root_action = executor["post-process"];
   XmlNodeAction& artifacts_action = root_action["artifacts"];
   XmlNodeAction& groups_action = root_action["groups"];

   PostProcessingConfiguration config;

   // Helper to bind a static method to an action handler in the DOM executor.
   auto bind_handler =
       [&config](std::function<bool(PostProcessingConfiguration*, Element*, IDiagnostics*)> h)
       -> XmlNodeAction::ActionFuncWithDiag {
     return std::bind(h, &config, std::placeholders::_1, std::placeholders::_2);
   };

   // Parse the artifact elements.
   artifacts_action["artifact"].Action(bind_handler(artifact_handler_));
   artifacts_action["artifact-format"].Action(bind_handler(artifact_format_handler_));

   // Parse the different configuration groups.
   groups_action["abi-group"].Action(bind_handler(abi_group_handler_));
   groups_action["screen-density-group"].Action(bind_handler(screen_density_group_handler_));
   groups_action["locale-group"].Action(bind_handler(locale_group_handler_));
   groups_action["android-sdk-group"].Action(bind_handler(android_sdk_group_handler_));
   groups_action["gl-texture-group"].Action(bind_handler(gl_texture_group_handler_));
   groups_action["device-feature-group"].Action(bind_handler(device_feature_group_handler_));

   if (!executor.Execute(XmlActionExecutorPolicy::kNone, diag_, doc.get())) {
     diag_->Error(DiagMessage() << "Could not process XML document");
     return {};
   }

   // TODO: Validate all references in the configuration are valid. It should be safe to assume from
   // this point on that any references from one section to another will be present.

   return {config};
 }

 ConfigurationParser::ActionHandler ConfigurationParser::artifact_handler_ =
     [](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
   Artifact artifact{};
   for (const auto& attr : root_element->attributes) {
     if (attr.name == "name") {
       artifact.name = attr.value;
     } else if (attr.name == "abi-group") {
       artifact.abi_group = {attr.value};
     } else if (attr.name == "screen-density-group") {
       artifact.screen_density_group = {attr.value};
     } else if (attr.name == "locale-group") {
       artifact.locale_group = {attr.value};
     } else if (attr.name == "android-sdk-group") {
       artifact.android_sdk_group = {attr.value};
     } else if (attr.name == "gl-texture-group") {
       artifact.gl_texture_group = {attr.value};
     } else if (attr.name == "device-feature-group") {
       artifact.device_feature_group = {attr.value};
     } else {
       diag->Note(DiagMessage() << "Unknown artifact attribute: " << attr.name << " = "
                                << attr.value);
     }
   }
   config->artifacts.push_back(artifact);
   return true;
 };

 ConfigurationParser::ActionHandler ConfigurationParser::artifact_format_handler_ =
     [](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
   for (auto& node : root_element->children) {
     xml::Text* t;
     if ((t = NodeCast<xml::Text>(node.get())) != nullptr) {
       config->artifact_format = TrimWhitespace(t->text).to_string();
       break;
     }
   }
   return true;
 };

 ConfigurationParser::ActionHandler ConfigurationParser::abi_group_handler_ =
     [](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
   std::string label = GetLabel(root_element, diag);
   if (label.empty()) {
     return false;
   }

   auto& group = config->abi_groups[label];
   bool valid = true;

   for (auto* child : root_element->GetChildElements()) {
     if (child->name != "abi") {
       diag->Error(DiagMessage() << "Unexpected element in ABI group: " << child->name);
       valid = false;
     } else {
       for (auto& node : child->children) {
         xml::Text* t;
         if ((t = NodeCast<xml::Text>(node.get())) != nullptr) {
           group.push_back(kStringToAbiMap.at(TrimWhitespace(t->text).to_string()));
           break;
         }
       }
     }
   }

   return valid;
 };

 ConfigurationParser::ActionHandler ConfigurationParser::screen_density_group_handler_ =
     [](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
   std::string label = GetLabel(root_element, diag);
   if (label.empty()) {
     return false;
   }

   auto& group = config->screen_density_groups[label];
   bool valid = true;

   for (auto* child : root_element->GetChildElements()) {
     if (child->name != "screen-density") {
       diag->Error(DiagMessage() << "Unexpected root_element in screen density group: "
                                 << child->name);
       valid = false;
     } else {
       for (auto& node : child->children) {
         xml::Text* t;
         if ((t = NodeCast<xml::Text>(node.get())) != nullptr) {
           ConfigDescription config_descriptor;
           const android::StringPiece& text = TrimWhitespace(t->text);
           if (ConfigDescription::Parse(text, &config_descriptor)) {
             // Copy the density with the minimum SDK version stripped out.
             group.push_back(config_descriptor.CopyWithoutSdkVersion());
           } else {
             diag->Error(DiagMessage()
                         << "Could not parse config descriptor for screen-density: " << text);
             valid = false;
           }
           break;
         }
       }
     }
   }

   return valid;
 };

 ConfigurationParser::ActionHandler ConfigurationParser::locale_group_handler_ =
     [](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
   std::string label = GetLabel(root_element, diag);
   if (label.empty()) {
     return false;
   }

   auto& group = config->locale_groups[label];
   bool valid = true;

   for (auto* child : root_element->GetChildElements()) {
     if (child->name != "locale") {
       diag->Error(DiagMessage() << "Unexpected root_element in screen density group: "
                                 << child->name);
       valid = false;
     } else {
       Locale entry;
       for (const auto& attr : child->attributes) {
         if (attr.name == "lang") {
           entry.lang = {attr.value};
         } else if (attr.name == "region") {
           entry.region = {attr.value};
         } else {
           diag->Warn(DiagMessage() << "Unknown attribute: " << attr.name << " = " << attr.value);
         }
       }
       group.push_back(entry);
     }
   }

   return valid;
 };

 ConfigurationParser::ActionHandler ConfigurationParser::android_sdk_group_handler_ =
     [](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
   std::string label = GetLabel(root_element, diag);
   if (label.empty()) {
     return false;
   }

   auto& group = config->android_sdk_groups[label];
   bool valid = true;

   for (auto* child : root_element->GetChildElements()) {
     if (child->name != "android-sdk") {
       diag->Error(DiagMessage() << "Unexpected root_element in ABI group: " << child->name);
       valid = false;
     } else {
       AndroidSdk entry;
       for (const auto& attr : child->attributes) {
         if (attr.name == "minSdkVersion") {
           entry.min_sdk_version = {attr.value};
         } else if (attr.name == "targetSdkVersion") {
           entry.target_sdk_version = {attr.value};
         } else if (attr.name == "maxSdkVersion") {
           entry.max_sdk_version = {attr.value};
         } else {
           diag->Warn(DiagMessage() << "Unknown attribute: " << attr.name << " = " << attr.value);
         }
       }

       // TODO: Fill in the manifest details when they are finalised.
       for (auto node : child->GetChildElements()) {
         if (node->name == "manifest") {
           if (entry.manifest) {
             diag->Warn(DiagMessage() << "Found multiple manifest tags. Ignoring duplicates.");
             continue;
           }
           entry.manifest = {AndroidManifest()};
         }
       }

       group.push_back(entry);
     }
   }

   return valid;
 };

 ConfigurationParser::ActionHandler ConfigurationParser::gl_texture_group_handler_ =
     [](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
   std::string label = GetLabel(root_element, diag);
   if (label.empty()) {
     return false;
   }

   auto& group = config->gl_texture_groups[label];
   bool valid = true;

   GlTexture result;
   for (auto* child : root_element->GetChildElements()) {
     if (child->name != "gl-texture") {
       diag->Error(DiagMessage() << "Unexpected element in GL texture group: " << child->name);
       valid = false;
     } else {
       for (const auto& attr : child->attributes) {
         if (attr.name == "name") {
           result.name = attr.value;
           break;
         }
       }

       for (auto* element : child->GetChildElements()) {
         if (element->name != "texture-path") {
           diag->Error(DiagMessage() << "Unexpected element in gl-texture element: " << child->name);
           valid = false;
           continue;
         }
         for (auto& node : element->children) {
           xml::Text* t;
           if ((t = NodeCast<xml::Text>(node.get())) != nullptr) {
             result.texture_paths.push_back(TrimWhitespace(t->text).to_string());
           }
         }
       }
     }
     group.push_back(result);
   }

   return valid;
 };

 ConfigurationParser::ActionHandler ConfigurationParser::device_feature_group_handler_ =
     [](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
   std::string label = GetLabel(root_element, diag);
   if (label.empty()) {
     return false;
   }

   auto& group = config->device_feature_groups[label];
   bool valid = true;

   for (auto* child : root_element->GetChildElements()) {
     if (child->name != "supports-feature") {
       diag->Error(DiagMessage() << "Unexpected root_element in device feature group: "
                                 << child->name);
       valid = false;
     } else {
       for (auto& node : child->children) {
         xml::Text* t;
         if ((t = NodeCast<xml::Text>(node.get())) != nullptr) {
           group.push_back(TrimWhitespace(t->text).to_string());
           break;
         }
       }
     }
   }

   return valid;
 };

 }  // 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 "configuration/ConfigurationParser.h"

	#include <algorithm>
	#include <functional>
	#include <map>
	#include <memory>
	#include <utility>

	#include <android-base/file.h>
	#include <android-base/logging.h>

	#include "ConfigDescription.h"
	#include "Diagnostics.h"
	#include "io/File.h"
	#include "io/FileSystem.h"
	#include "util/Maybe.h"
	#include "util/Util.h"
	#include "xml/XmlActionExecutor.h"
	#include "xml/XmlDom.h"
	#include "xml/XmlUtil.h"

	namespace aapt {

	namespace {

	using ::aapt::configuration::Abi;
	using ::aapt::configuration::AndroidManifest;
	using ::aapt::configuration::AndroidSdk;
	using ::aapt::configuration::Artifact;
	using ::aapt::configuration::PostProcessingConfiguration;
	using ::aapt::configuration::GlTexture;
	using ::aapt::configuration::Group;
	using ::aapt::configuration::Locale;
	using ::aapt::io::IFile;
	using ::aapt::io::RegularFile;
	using ::aapt::util::TrimWhitespace;
	using ::aapt::xml::Element;
	using ::aapt::xml::FindRootElement;
	using ::aapt::xml::NodeCast;
	using ::aapt::xml::XmlActionExecutor;
	using ::aapt::xml::XmlActionExecutorPolicy;
	using ::aapt::xml::XmlNodeAction;
	using ::android::base::ReadFileToString;

	const std::unordered_map<std::string, Abi> kStringToAbiMap = {
	{"armeabi", Abi::kArmeV6}, {"armeabi-v7a", Abi::kArmV7a}, {"arm64-v8a", Abi::kArm64V8a},
	{"x86", Abi::kX86}, {"x86_64", Abi::kX86_64}, {"mips", Abi::kMips},
	{"mips64", Abi::kMips64}, {"universal", Abi::kUniversal},
	};
	const std::map<Abi, std::string> kAbiToStringMap = {
	{Abi::kArmeV6, "armeabi"}, {Abi::kArmV7a, "armeabi-v7a"}, {Abi::kArm64V8a, "arm64-v8a"},
	{Abi::kX86, "x86"}, {Abi::kX86_64, "x86_64"}, {Abi::kMips, "mips"},
	{Abi::kMips64, "mips64"}, {Abi::kUniversal, "universal"},
	};

	constexpr const char* kAaptXmlNs = "http://schemas.android.com/tools/aapt";

	/** A default noop diagnostics context. */
	class NoopDiagnostics : public IDiagnostics {
	public:
	void Log(Level level, DiagMessageActual& actualMsg) override {}
	};
	NoopDiagnostics noop_;

	std::string GetLabel(const Element* element, IDiagnostics* diag) {
	std::string label;
	for (const auto& attr : element->attributes) {
	if (attr.name == "label") {
	label = attr.value;
	break;
	}
	}

	if (label.empty()) {
	diag->Error(DiagMessage() << "No label found for element " << element->name);
	}
	return label;
	}

	/** XML node visitor that removes all of the namespace URIs from the node and all children. */
	class NamespaceVisitor : public xml::Visitor {
	public:
	void Visit(xml::Element* node) override {
	node->namespace_uri.clear();
	VisitChildren(node);
	}
	};

	} // namespace

	namespace configuration {

	const std::string& AbiToString(Abi abi) {
	return kAbiToStringMap.find(abi)->second;
	}

	/**
	* Attempts to replace the placeholder in the name string with the provided value. Returns true on
	* success, or false if the either the placeholder is not found in the name, or the value is not
	* present and the placeholder was.
	*/
	static bool ReplacePlaceholder(const std::string& placeholder, const Maybe<std::string>& value,
	std::string* name, IDiagnostics* diag) {
	size_t offset = name->find(placeholder);
	if (value) {
	if (offset == std::string::npos) {
	diag->Error(DiagMessage() << "Missing placeholder for artifact: " << placeholder);
	return false;
	}
	name->replace(offset, placeholder.length(), value.value());
	return true;
	}

	// Make sure the placeholder was not present if the desired value was not present.
	bool result = (offset == std::string::npos);
	if (!result) {
	diag->Error(DiagMessage() << "Placeholder present but no value for artifact: " << placeholder);
	}
	return result;
	}

	Maybe<std::string> Artifact::ToArtifactName(const std::string& format, IDiagnostics* diag) const {
	std::string result = format;

	if (!ReplacePlaceholder("{abi}", abi_group, &result, diag)) {
	return {};
	}

	if (!ReplacePlaceholder("{density}", screen_density_group, &result, diag)) {
	return {};
	}

	if (!ReplacePlaceholder("{locale}", locale_group, &result, diag)) {
	return {};
	}

	if (!ReplacePlaceholder("{sdk}", android_sdk_group, &result, diag)) {
	return {};
	}

	if (!ReplacePlaceholder("{feature}", device_feature_group, &result, diag)) {
	return {};
	}

	if (!ReplacePlaceholder("{gl}", gl_texture_group, &result, diag)) {
	return {};
	}

	return result;
	}

	} // namespace configuration

	/** Returns a ConfigurationParser for the file located at the provided path. */
	Maybe<ConfigurationParser> ConfigurationParser::ForPath(const std::string& path) {
	std::string contents;
	if (!ReadFileToString(path, &contents, true)) {
	return {};
	}
	return ConfigurationParser(contents);
	}

	ConfigurationParser::ConfigurationParser(std::string contents)
	: contents_(std::move(contents)),
	diag_(&noop_) {
	}

	Maybe<PostProcessingConfiguration> ConfigurationParser::Parse() {
	std::istringstream in(contents_);

	auto doc = xml::Inflate(&in, diag_, Source("config.xml"));
	if (!doc) {
	return {};
	}

	// Strip any namespaces from the XML as the XmlActionExecutor ignores anything with a namespace.
	auto* root = FindRootElement(doc.get());
	if (root == nullptr) {
	diag_->Error(DiagMessage() << "Could not find the root element in the XML document");
	return {};
	}

	std::string& xml_ns = root->namespace_uri;
	if (!xml_ns.empty()) {
	if (xml_ns != kAaptXmlNs) {
	diag_->Error(DiagMessage() << "Unknown namespace found on root element: " << xml_ns);
	return {};
	}

	xml_ns.clear();
	NamespaceVisitor visitor;
	root->Accept(&visitor);
	}

	XmlActionExecutor executor;
	XmlNodeAction& root_action = executor["post-process"];
	XmlNodeAction& artifacts_action = root_action["artifacts"];
	XmlNodeAction& groups_action = root_action["groups"];

	PostProcessingConfiguration config;

	// Helper to bind a static method to an action handler in the DOM executor.
	auto bind_handler =
	[&config](std::function<bool(PostProcessingConfiguration, Element, IDiagnostics*)> h)
	-> XmlNodeAction::ActionFuncWithDiag {
	return std::bind(h, &config, std::placeholders::_1, std::placeholders::_2);
	};

	// Parse the artifact elements.
	artifacts_action["artifact"].Action(bind_handler(artifact_handler_));
	artifacts_action["artifact-format"].Action(bind_handler(artifact_format_handler_));

	// Parse the different configuration groups.
	groups_action["abi-group"].Action(bind_handler(abi_group_handler_));
	groups_action["screen-density-group"].Action(bind_handler(screen_density_group_handler_));
	groups_action["locale-group"].Action(bind_handler(locale_group_handler_));
	groups_action["android-sdk-group"].Action(bind_handler(android_sdk_group_handler_));
	groups_action["gl-texture-group"].Action(bind_handler(gl_texture_group_handler_));
	groups_action["device-feature-group"].Action(bind_handler(device_feature_group_handler_));

	if (!executor.Execute(XmlActionExecutorPolicy::kNone, diag_, doc.get())) {
	diag_->Error(DiagMessage() << "Could not process XML document");
	return {};
	}

	// TODO: Validate all references in the configuration are valid. It should be safe to assume from
	// this point on that any references from one section to another will be present.

	return {config};
	}

	ConfigurationParser::ActionHandler ConfigurationParser::artifact_handler_ =
	[](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
	Artifact artifact{};
	for (const auto& attr : root_element->attributes) {
	if (attr.name == "name") {
	artifact.name = attr.value;
	} else if (attr.name == "abi-group") {
	artifact.abi_group = {attr.value};
	} else if (attr.name == "screen-density-group") {
	artifact.screen_density_group = {attr.value};
	} else if (attr.name == "locale-group") {
	artifact.locale_group = {attr.value};
	} else if (attr.name == "android-sdk-group") {
	artifact.android_sdk_group = {attr.value};
	} else if (attr.name == "gl-texture-group") {
	artifact.gl_texture_group = {attr.value};
	} else if (attr.name == "device-feature-group") {
	artifact.device_feature_group = {attr.value};
	} else {
	diag->Note(DiagMessage() << "Unknown artifact attribute: " << attr.name << " = "
	<< attr.value);
	}
	}
	config->artifacts.push_back(artifact);
	return true;
	};

	ConfigurationParser::ActionHandler ConfigurationParser::artifact_format_handler_ =
	[](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
	for (auto& node : root_element->children) {
	xml::Text* t;
	if ((t = NodeCast<xml::Text>(node.get())) != nullptr) {
	config->artifact_format = TrimWhitespace(t->text).to_string();
	break;
	}
	}
	return true;
	};

	ConfigurationParser::ActionHandler ConfigurationParser::abi_group_handler_ =
	[](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
	std::string label = GetLabel(root_element, diag);
	if (label.empty()) {
	return false;
	}

	auto& group = config->abi_groups[label];
	bool valid = true;

	for (auto* child : root_element->GetChildElements()) {
	if (child->name != "abi") {
	diag->Error(DiagMessage() << "Unexpected element in ABI group: " << child->name);
	valid = false;
	} else {
	for (auto& node : child->children) {
	xml::Text* t;
	if ((t = NodeCast<xml::Text>(node.get())) != nullptr) {
	group.push_back(kStringToAbiMap.at(TrimWhitespace(t->text).to_string()));
	break;
	}
	}
	}
	}

	return valid;
	};

	ConfigurationParser::ActionHandler ConfigurationParser::screen_density_group_handler_ =
	[](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
	std::string label = GetLabel(root_element, diag);
	if (label.empty()) {
	return false;
	}

	auto& group = config->screen_density_groups[label];
	bool valid = true;

	for (auto* child : root_element->GetChildElements()) {
	if (child->name != "screen-density") {
	diag->Error(DiagMessage() << "Unexpected root_element in screen density group: "
	<< child->name);
	valid = false;
	} else {
	for (auto& node : child->children) {
	xml::Text* t;
	if ((t = NodeCast<xml::Text>(node.get())) != nullptr) {
	ConfigDescription config_descriptor;
	const android::StringPiece& text = TrimWhitespace(t->text);
	if (ConfigDescription::Parse(text, &config_descriptor)) {
	// Copy the density with the minimum SDK version stripped out.
	group.push_back(config_descriptor.CopyWithoutSdkVersion());
	} else {
	diag->Error(DiagMessage()
	<< "Could not parse config descriptor for screen-density: " << text);
	valid = false;
	}
	break;
	}
	}
	}
	}

	return valid;
	};

	ConfigurationParser::ActionHandler ConfigurationParser::locale_group_handler_ =
	[](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
	std::string label = GetLabel(root_element, diag);
	if (label.empty()) {
	return false;
	}

	auto& group = config->locale_groups[label];
	bool valid = true;

	for (auto* child : root_element->GetChildElements()) {
	if (child->name != "locale") {
	diag->Error(DiagMessage() << "Unexpected root_element in screen density group: "
	<< child->name);
	valid = false;
	} else {
	Locale entry;
	for (const auto& attr : child->attributes) {
	if (attr.name == "lang") {
	entry.lang = {attr.value};
	} else if (attr.name == "region") {
	entry.region = {attr.value};
	} else {
	diag->Warn(DiagMessage() << "Unknown attribute: " << attr.name << " = " << attr.value);
	}
	}
	group.push_back(entry);
	}
	}

	return valid;
	};

	ConfigurationParser::ActionHandler ConfigurationParser::android_sdk_group_handler_ =
	[](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
	std::string label = GetLabel(root_element, diag);
	if (label.empty()) {
	return false;
	}

	auto& group = config->android_sdk_groups[label];
	bool valid = true;

	for (auto* child : root_element->GetChildElements()) {
	if (child->name != "android-sdk") {
	diag->Error(DiagMessage() << "Unexpected root_element in ABI group: " << child->name);
	valid = false;
	} else {
	AndroidSdk entry;
	for (const auto& attr : child->attributes) {
	if (attr.name == "minSdkVersion") {
	entry.min_sdk_version = {attr.value};
	} else if (attr.name == "targetSdkVersion") {
	entry.target_sdk_version = {attr.value};
	} else if (attr.name == "maxSdkVersion") {
	entry.max_sdk_version = {attr.value};
	} else {
	diag->Warn(DiagMessage() << "Unknown attribute: " << attr.name << " = " << attr.value);
	}
	}

	// TODO: Fill in the manifest details when they are finalised.
	for (auto node : child->GetChildElements()) {
	if (node->name == "manifest") {
	if (entry.manifest) {
	diag->Warn(DiagMessage() << "Found multiple manifest tags. Ignoring duplicates.");
	continue;
	}
	entry.manifest = {AndroidManifest()};
	}
	}

	group.push_back(entry);
	}
	}

	return valid;
	};

	ConfigurationParser::ActionHandler ConfigurationParser::gl_texture_group_handler_ =
	[](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
	std::string label = GetLabel(root_element, diag);
	if (label.empty()) {
	return false;
	}

	auto& group = config->gl_texture_groups[label];
	bool valid = true;

	GlTexture result;
	for (auto* child : root_element->GetChildElements()) {
	if (child->name != "gl-texture") {
	diag->Error(DiagMessage() << "Unexpected element in GL texture group: " << child->name);
	valid = false;
	} else {
	for (const auto& attr : child->attributes) {
	if (attr.name == "name") {
	result.name = attr.value;
	break;
	}
	}

	for (auto* element : child->GetChildElements()) {
	if (element->name != "texture-path") {
	diag->Error(DiagMessage() << "Unexpected element in gl-texture element: " << child->name);
	valid = false;
	continue;
	}
	for (auto& node : element->children) {
	xml::Text* t;
	if ((t = NodeCast<xml::Text>(node.get())) != nullptr) {
	result.texture_paths.push_back(TrimWhitespace(t->text).to_string());
	}
	}
	}
	}
	group.push_back(result);
	}

	return valid;
	};

	ConfigurationParser::ActionHandler ConfigurationParser::device_feature_group_handler_ =
	[](PostProcessingConfiguration* config, Element* root_element, IDiagnostics* diag) -> bool {
	std::string label = GetLabel(root_element, diag);
	if (label.empty()) {
	return false;
	}

	auto& group = config->device_feature_groups[label];
	bool valid = true;

	for (auto* child : root_element->GetChildElements()) {
	if (child->name != "supports-feature") {
	diag->Error(DiagMessage() << "Unexpected root_element in device feature group: "
	<< child->name);
	valid = false;
	} else {
	for (auto& node : child->children) {
	xml::Text* t;
	if ((t = NodeCast<xml::Text>(node.get())) != nullptr) {
	group.push_back(TrimWhitespace(t->text).to_string());
	break;
	}
	}
	}
	}

	return valid;
	};

	} // namespace aapt