[GN] Add support for generating Xcode projects.

tools/gn/xcode_object.cc

Index: tools/gn/xcode_object.cc
diff --git a/tools/gn/xcode_object.cc b/tools/gn/xcode_object.cc
new file mode 100644
index 0000000000000000000000000000000000000000..bc8994409fe71ca5a429cf728ba7e611bb1d8e87
--- /dev/null
+++ b/tools/gn/xcode_object.cc
@@ -0,0 +1,858 @@
+// Copyright 2016 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "tools/gn/xcode_object.h"
+
+#include <iomanip>
+#include <sstream>
+#include <utility>
+
+#include "base/files/file_path.h"
+#include "base/logging.h"
+#include "base/memory/ptr_util.h"
+#include "base/strings/string_util.h"
+
+// Helper methods -------------------------------------------------------------
+
+namespace {
+struct IndentRules {
+  bool one_line;
+  unsigned level;
+};
+
+std::vector<std::unique_ptr<PBXObject>> EmptyPBXObjectVector() {
+  return std::vector<std::unique_ptr<PBXObject>>();
+}
+
+bool CharNeedEscaping(char c) {
+  if (base::IsAsciiAlpha(c) || base::IsAsciiDigit(c))
+    return false;
+  if (c == '$' || c == '.' || c == '/' || c == '_')
+    return false;
+  return true;
+}
+
+bool StringNeedEscaping(const std::string& string) {
+  if (string.empty())
+    return true;
+  if (string.find("___") != std::string::npos)
+    return true;
+
+  for (char c : string) {
+    if (CharNeedEscaping(c))
+      return true;
+  }
+  return false;
+}
+
+std::string EncodeString(const std::string& string) {
+  if (!StringNeedEscaping(string))
+    return string;
+
+  std::stringstream buffer;
+  buffer << '"';
+  for (char c : string) {
+    if (c <= 31) {
+      switch (c) {
+        case '\a':
+          buffer << "\\a";
+          break;
+        case '\b':
+          buffer << "\\b";
+          break;
+        case '\t':
+          buffer << "\\t";
+          break;
+        case '\n':
+        case '\r':
+          buffer << "\\n";
+          break;
+        case '\v':
+          buffer << "\\v";
+          break;
+        case '\f':
+          buffer << "\\f";
+          break;
+        default:
+          buffer << std::hex << std::setw(4) << std::left << "\\U"
+                 << static_cast<unsigned>(c);
+          break;
+      }
+    } else {
+      if (c == '"' || c == '\\')
+        buffer << '\\';
+      buffer << c;
+    }
+  }
+  buffer << '"';
+  return buffer.str();
+}
+
+const char* GetSourceType(const base::FilePath::StringType& ext) {
+  std::map<base::FilePath::StringType, const char*> extension_map = {
+      {FILE_PATH_LITERAL(".a"), "archive.ar"},
+      {FILE_PATH_LITERAL(".app"), "wrapper.application"},
+      {FILE_PATH_LITERAL(".bdic"), "file"},
+      {FILE_PATH_LITERAL(".bundle"), "wrapper.cfbundle"},
+      {FILE_PATH_LITERAL(".c"), "sourcecode.c.c"},
+      {FILE_PATH_LITERAL(".cc"), "sourcecode.cpp.cpp"},
+      {FILE_PATH_LITERAL(".cpp"), "sourcecode.cpp.cpp"},
+      {FILE_PATH_LITERAL(".css"), "text.css"},
+      {FILE_PATH_LITERAL(".cxx"), "sourcecode.cpp.cpp"},
+      {FILE_PATH_LITERAL(".dart"), "sourcecode"},
+      {FILE_PATH_LITERAL(".dylib"), "compiled.mach-o.dylib"},
+      {FILE_PATH_LITERAL(".framework"), "wrapper.framework"},
+      {FILE_PATH_LITERAL(".h"), "sourcecode.c.h"},
+      {FILE_PATH_LITERAL(".hxx"), "sourcecode.cpp.h"},
+      {FILE_PATH_LITERAL(".icns"), "image.icns"},
+      {FILE_PATH_LITERAL(".java"), "sourcecode.java"},
+      {FILE_PATH_LITERAL(".js"), "sourcecode.javascript"},
+      {FILE_PATH_LITERAL(".kext"), "wrapper.kext"},
+      {FILE_PATH_LITERAL(".m"), "sourcecode.c.objc"},
+      {FILE_PATH_LITERAL(".mm"), "sourcecode.cpp.objcpp"},
+      {FILE_PATH_LITERAL(".nib"), "wrapper.nib"},
+      {FILE_PATH_LITERAL(".o"), "compiled.mach-o.objfile"},
+      {FILE_PATH_LITERAL(".pdf"), "image.pdf"},
+      {FILE_PATH_LITERAL(".pl"), "text.script.perl"},
+      {FILE_PATH_LITERAL(".plist"), "text.plist.xml"},
+      {FILE_PATH_LITERAL(".pm"), "text.script.perl"},
+      {FILE_PATH_LITERAL(".png"), "image.png"},
+      {FILE_PATH_LITERAL(".py"), "text.script.python"},
+      {FILE_PATH_LITERAL(".r"), "sourcecode.rez"},
+      {FILE_PATH_LITERAL(".rez"), "sourcecode.rez"},
+      {FILE_PATH_LITERAL(".s"), "sourcecode.asm"},
+      {FILE_PATH_LITERAL(".storyboard"), "file.storyboard"},
+      {FILE_PATH_LITERAL(".strings"), "text.plist.strings"},
+      {FILE_PATH_LITERAL(".swift"), "sourcecode.swift"},
+      {FILE_PATH_LITERAL(".ttf"), "file"},
+      {FILE_PATH_LITERAL(".xcassets"), "folder.assetcatalog"},
+      {FILE_PATH_LITERAL(".xcconfig"), "text.xcconfig"},
+      {FILE_PATH_LITERAL(".xcdatamodel"), "wrapper.xcdatamodel"},
+      {FILE_PATH_LITERAL(".xcdatamodeld"), "wrapper.xcdatamodeld"},
+      {FILE_PATH_LITERAL(".xib"), "file.xib"},
+      {FILE_PATH_LITERAL(".y"), "sourcecode.yacc"},
+  };
+
+  const auto& iter = extension_map.find(ext);
+  if (iter != extension_map.end()) {
+    return iter->second;
+  }
+
+  return "text";
+}
+
+bool HasExplicitFileType(const base::FilePath::StringType& ext) {
+  return ext == FILE_PATH_LITERAL(".dart");
+}
+
+bool IsSourceFileForIndexing(const base::FilePath::StringType& ext) {
+  return ext == FILE_PATH_LITERAL(".c") || ext == FILE_PATH_LITERAL(".cc") ||
+         ext == FILE_PATH_LITERAL(".cpp") || ext == FILE_PATH_LITERAL(".cxx") ||
+         ext == FILE_PATH_LITERAL(".m") || ext == FILE_PATH_LITERAL(".mm");
+}
+
+void PrintValue(std::ostream& out, IndentRules rules, unsigned value) {
+  out << value;
+}
+
+void PrintValue(std::ostream& out, IndentRules rules, const char* value) {
+  out << EncodeString(value);
+}
+
+void PrintValue(std::ostream& out,
+                IndentRules rules,
+                const std::string& value) {
+  out << EncodeString(value);
+}
+
+void PrintValue(std::ostream& out, IndentRules rules, const PBXObject* value) {
+  out << value->Reference();
+}
+
+template <typename ObjectClass>
+void PrintValue(std::ostream& out,
+                IndentRules rules,
+                const std::unique_ptr<ObjectClass>& value) {
+  PrintValue(out, rules, value.get());
+}
+
+template <typename ValueType>
+void PrintValue(std::ostream& out,
+                IndentRules rules,
+                const std::vector<ValueType>& values) {
+  IndentRules sub_rule{rules.one_line, rules.level + 1};
+  out << "(" << (rules.one_line ? " " : "\n");
+  for (const auto& value : values) {
+    if (!sub_rule.one_line)
+      out << std::string(sub_rule.level, '\t');
+
+    PrintValue(out, sub_rule, value);
+    out << "," << (rules.one_line ? " " : "\n");
+  }
+
+  if (!rules.one_line && rules.level)
+    out << std::string(rules.level, '\t');
+  out << ")";
+}
+
+template <typename ValueType>
+void PrintValue(std::ostream& out,
+                IndentRules rules,
+                const std::map<std::string, ValueType>& values) {
+  IndentRules sub_rule{rules.one_line, rules.level + 1};
+  out << "{" << (rules.one_line ? " " : "\n");
+  for (const auto& pair : values) {
+    if (!sub_rule.one_line)
+      out << std::string(sub_rule.level, '\t');
+
+    out << pair.first << " = ";
+    PrintValue(out, sub_rule, pair.second);
+    out << ";" << (rules.one_line ? " " : "\n");
+  }
+
+  if (!rules.one_line && rules.level)
+    out << std::string(rules.level, '\t');
+  out << "}";
+}
+
+template <typename ValueType>
+void PrintProperty(std::ostream& out,
+                   IndentRules rules,
+                   const char* name,
+                   ValueType&& value) {
+  if (!rules.one_line && rules.level)
+    out << std::string(rules.level, '\t');
+
+  out << name << " = ";
+  PrintValue(out, rules, std::forward<ValueType>(value));
+  out << ";" << (rules.one_line ? " " : "\n");
+}
+}  // namespace
+
+// PBXObjectClass -------------------------------------------------------------
+
+const char* ToString(PBXObjectClass cls) {
+  switch (cls) {
+    case PBXAggregateTargetClass:
+      return "PBXAggregateTarget";
+    case PBXBuildFileClass:
+      return "PBXBuildFile";
+    case PBXFileReferenceClass:
+      return "PBXFileReference";
+    case PBXFrameworksBuildPhaseClass:
+      return "PBXFrameworksBuildPhase";
+    case PBXGroupClass:
+      return "PBXGroup";
+    case PBXNativeTargetClass:
+      return "PBXNativeTarget";
+    case PBXProjectClass:
+      return "PBXProject";
+    case PBXShellScriptBuildPhaseClass:
+      return "PBXShellScriptBuildPhase";
+    case PBXSourcesBuildPhaseClass:
+      return "PBXSourcesBuildPhase";
+    case XCBuildConfigurationClass:
+      return "XCBuildConfiguration";
+    case XCConfigurationListClass:
+      return "XCConfigurationList";
+  }
+  NOTREACHED();
+  return nullptr;
+}
+
+// PBXObjectVisitor -----------------------------------------------------------
+
+PBXObjectVisitor::PBXObjectVisitor() {}
+
+PBXObjectVisitor::~PBXObjectVisitor() {}
+
+// PBXObject ------------------------------------------------------------------
+
+PBXObject::PBXObject() {}
+
+PBXObject::~PBXObject() {}
+
+void PBXObject::SetId(const std::string& id) {
+  DCHECK(id_.empty());
+  DCHECK(!id.empty());
+  id_.assign(id);
+}
+
+std::string PBXObject::Reference() const {
+  std::string comment = Comment();
+  if (comment.empty())
+    return id_;
+
+  return id_ + " /* " + comment + " */";
+}
+
+std::string PBXObject::Comment() const {
+  return Name();
+}
+
+void PBXObject::Visit(PBXObjectVisitor& visitor) {
+  visitor.Visit(this);
+}
+
+// PBXBuildPhase --------------------------------------------------------------
+
+PBXBuildPhase::PBXBuildPhase() {}
+
+PBXBuildPhase::~PBXBuildPhase() {}
+
+// PBXTarget ------------------------------------------------------------------
+
+PBXTarget::PBXTarget(const std::string& name,
+                     const std::string& shell_script,
+                     const std::string& config_name,
+                     const PBXAttributes& attributes)
+    : configurations_(new XCConfigurationList(config_name, attributes, this)),
+      name_(name) {
+  if (!shell_script.empty()) {
+    build_phases_.push_back(
+        base::WrapUnique(new PBXShellScriptBuildPhase(name, shell_script)));
+  }
+}
+
+PBXTarget::~PBXTarget() {}
+
+std::string PBXTarget::Name() const {
+  return name_;
+}
+
+void PBXTarget::Visit(PBXObjectVisitor& visitor) {
+  PBXObject::Visit(visitor);
+  configurations_->Visit(visitor);
+  for (const auto& build_phase : build_phases_) {
+    build_phase->Visit(visitor);
+  }
+}
+
+// PBXAggregateTarget ---------------------------------------------------------
+
+PBXAggregateTarget::PBXAggregateTarget(const std::string& name,
+                                       const std::string& shell_script,
+                                       const std::string& config_name,
+                                       const PBXAttributes& attributes)
+    : PBXTarget(name, shell_script, config_name, attributes) {}
+
+PBXAggregateTarget::~PBXAggregateTarget() {}
+
+PBXObjectClass PBXAggregateTarget::Class() const {
+  return PBXAggregateTargetClass;
+}
+
+void PBXAggregateTarget::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {false, indent + 1};
+  out << indent_str << Reference() << " = {\n";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+  PrintProperty(out, rules, "buildConfigurationList", configurations_);
+  PrintProperty(out, rules, "buildPhases", build_phases_);
+  PrintProperty(out, rules, "dependencies", EmptyPBXObjectVector());
+  PrintProperty(out, rules, "name", name_);
+  PrintProperty(out, rules, "productName", name_);
+  out << indent_str << "};\n";
+}
+
+// PBXBuildFile ---------------------------------------------------------------
+
+PBXBuildFile::PBXBuildFile(const PBXFileReference* file_reference,
+                           const PBXSourcesBuildPhase* build_phase)
+    : file_reference_(file_reference), build_phase_(build_phase) {
+  DCHECK(file_reference_);
+  DCHECK(build_phase_);
+}
+
+PBXBuildFile::~PBXBuildFile() {}
+
+PBXObjectClass PBXBuildFile::Class() const {
+  return PBXBuildFileClass;
+}
+
+std::string PBXBuildFile::Name() const {
+  return file_reference_->Name() + " in " + build_phase_->Name();
+}
+
+void PBXBuildFile::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {true, 0};
+  out << indent_str << Reference() << " = {";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+  PrintProperty(out, rules, "fileRef", file_reference_);
+  out << "};\n";
+}
+
+// PBXFileReference -----------------------------------------------------------
+
+PBXFileReference::PBXFileReference(const std::string& name,
+                                   const std::string& path,
+                                   const std::string& type)
+    : name_(name), path_(path), type_(type) {}
+
+PBXFileReference::~PBXFileReference() {}
+
+PBXObjectClass PBXFileReference::Class() const {
+  return PBXFileReferenceClass;
+}
+
+std::string PBXFileReference::Name() const {
+  return path_;
+}
+
+void PBXFileReference::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {true, 0};
+  out << indent_str << Reference() << " = {";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+
+  if (!type_.empty()) {
+    PrintProperty(out, rules, "explicitFileType", type_);
+    PrintProperty(out, rules, "includeInIndex", 0u);
+  } else {
+    const base::FilePath::StringType ext =
+        base::FilePath::FromUTF8Unsafe(path_).Extension();
+
+    if (HasExplicitFileType(ext))
+      PrintProperty(out, rules, "explicitFileType", GetSourceType(ext));
+    else
+      PrintProperty(out, rules, "lastKnownFileType", GetSourceType(ext));
+  }
+
+  if (name_ != path_ && !name_.empty())
+    PrintProperty(out, rules, "name", name_);
+
+  PrintProperty(out, rules, "path", path_);
+  PrintProperty(out, rules, "sourceTree",
+                type_.empty() ? "<group>" : "BUILT_PRODUCTS_DIR");
+  out << "};\n";
+}
+
+// PBXFrameworksBuildPhase ----------------------------------------------------
+
+PBXFrameworksBuildPhase::PBXFrameworksBuildPhase() {}
+
+PBXFrameworksBuildPhase::~PBXFrameworksBuildPhase() {}
+
+PBXObjectClass PBXFrameworksBuildPhase::Class() const {
+  return PBXFrameworksBuildPhaseClass;
+}
+
+std::string PBXFrameworksBuildPhase::Name() const {
+  return "Frameworks";
+}
+
+void PBXFrameworksBuildPhase::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {false, indent + 1};
+  out << indent_str << Reference() << " = {\n";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+  PrintProperty(out, rules, "buildActionMask", 0x7fffffffu);
+  PrintProperty(out, rules, "files", EmptyPBXObjectVector());
+  PrintProperty(out, rules, "runOnlyForDeploymentPostprocessing", 0u);
+  out << indent_str << "};\n";
+}
+
+// PBXGroup -------------------------------------------------------------------
+
+PBXGroup::PBXGroup(const std::string& path, const std::string& name)
+    : name_(name), path_(path) {}
+
+PBXGroup::~PBXGroup() {}
+
+PBXObject* PBXGroup::AddChild(std::unique_ptr<PBXObject> child) {
+  DCHECK(child);
+  children_.push_back(std::move(child));
+  return children_.back().get();
+}
+
+PBXFileReference* PBXGroup::AddSourceFile(const std::string& source_path) {
+  DCHECK(!source_path.empty());
+  std::string::size_type sep = source_path.find("/");
+  if (sep == std::string::npos) {
+    children_.push_back(base::WrapUnique(
+        new PBXFileReference(std::string(), source_path, std::string())));
+    return static_cast<PBXFileReference*>(children_.back().get());
+  }
+
+  PBXGroup* group = nullptr;
+  base::StringPiece component(source_path.data(), sep);
+  for (const auto& child : children_) {
+    if (child->Class() != PBXGroupClass)
+      continue;
+
+    PBXGroup* child_as_group = static_cast<PBXGroup*>(child.get());
+    if (child_as_group->path_ == component) {
+      group = child_as_group;
+      break;
+    }
+  }
+
+  if (!group) {
+    children_.push_back(base::WrapUnique(new PBXGroup(component.as_string())));
+    group = static_cast<PBXGroup*>(children_.back().get());
+  }
+
+  DCHECK(group);
+  DCHECK(group->path_ == component);
+  return group->AddSourceFile(source_path.substr(sep + 1));
+}
+
+PBXObjectClass PBXGroup::Class() const {
+  return PBXGroupClass;
+}
+
+std::string PBXGroup::Name() const {
+  if (!name_.empty())
+    return name_;
+  if (!path_.empty())
+    return path_;
+  return std::string();
+}
+
+void PBXGroup::Visit(PBXObjectVisitor& visitor) {
+  PBXObject::Visit(visitor);
+  for (const auto& child : children_) {
+    child->Visit(visitor);
+  }
+}
+
+void PBXGroup::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {false, indent + 1};
+  out << indent_str << Reference() << " = {\n";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+  PrintProperty(out, rules, "children", children_);
+  if (!name_.empty())
+    PrintProperty(out, rules, "name", name_);
+  if (!path_.empty())
+    PrintProperty(out, rules, "path", path_);
+  PrintProperty(out, rules, "sourceTree", "<group>");
+  out << indent_str << "};\n";
+}
+
+// PBXNativeTarget ------------------------------------------------------------
+
+PBXNativeTarget::PBXNativeTarget(const std::string& name,
+                                 const std::string& shell_script,
+                                 const std::string& config_name,
+                                 const PBXAttributes& attributes,
+                                 const std::string& product_type,
+                                 const PBXFileReference* product_reference)
+    : PBXTarget(name, shell_script, config_name, attributes),
+      product_reference_(product_reference),
+      product_type_(product_type) {
+  DCHECK(product_reference_);
+  build_phases_.push_back(base::WrapUnique(new PBXSourcesBuildPhase));
+  source_build_phase_ =
+      static_cast<PBXSourcesBuildPhase*>(build_phases_.back().get());
+
+  build_phases_.push_back(base::WrapUnique(new PBXFrameworksBuildPhase));
+}
+
+PBXNativeTarget::~PBXNativeTarget() {}
+
+void PBXNativeTarget::AddFileForIndexing(
+    const PBXFileReference* file_reference) {
+  DCHECK(file_reference);
+  source_build_phase_->AddBuildFile(
+      base::WrapUnique(new PBXBuildFile(file_reference, source_build_phase_)));
+}
+
+PBXObjectClass PBXNativeTarget::Class() const {
+  return PBXNativeTargetClass;
+}
+
+void PBXNativeTarget::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {false, indent + 1};
+  out << indent_str << Reference() << " = {\n";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+  PrintProperty(out, rules, "buildConfigurationList", configurations_);
+  PrintProperty(out, rules, "buildPhases", build_phases_);
+  PrintProperty(out, rules, "buildRules", EmptyPBXObjectVector());
+  PrintProperty(out, rules, "dependencies", EmptyPBXObjectVector());
+  PrintProperty(out, rules, "name", name_);
+  PrintProperty(out, rules, "productName", name_);
+  PrintProperty(out, rules, "productReference", product_reference_);
+  PrintProperty(out, rules, "productType", product_type_);
+  out << indent_str << "};\n";
+}
+
+// PBXProject -----------------------------------------------------------------
+
+PBXProject::PBXProject(const std::string& name,
+                       const std::string& config_name,
+                       const std::string& source_path,
+                       const PBXAttributes& attributes)
+    : name_(name), config_name_(config_name), target_for_indexing_(nullptr) {
+  attributes_["BuildIndependentTargetsInParallel"] = "YES";
+
+  main_group_.reset(new PBXGroup);
+  sources_ = static_cast<PBXGroup*>(main_group_->AddChild(
+      base::WrapUnique(new PBXGroup(source_path, "Source"))));
+  products_ = static_cast<PBXGroup*>(main_group_->AddChild(
+      base::WrapUnique(new PBXGroup(std::string(), "Product"))));
+  main_group_->AddChild(base::WrapUnique(new PBXGroup(std::string(), "Build")));
+
+  configurations_.reset(new XCConfigurationList(config_name, attributes, this));
+}
+
+PBXProject::~PBXProject() {}
+
+void PBXProject::AddSourceFile(const std::string& source_path) {
+  PBXFileReference* file_reference = sources_->AddSourceFile(source_path);
+  const base::FilePath::StringType ext =
+      base::FilePath::FromUTF8Unsafe(source_path).Extension();
+  if (!IsSourceFileForIndexing(ext))
+    return;
+
+  if (!target_for_indexing_) {
+    PBXAttributes attributes;
+    attributes["EXECUTABLE_PREFIX"] = "";
+    attributes["HEADER_SEARCH_PATHS"] = sources_->path();
+    attributes["PRODUCT_NAME"] = name_;
+
+    PBXFileReference* product_reference = static_cast<PBXFileReference*>(
+        products_->AddChild(base::WrapUnique(new PBXFileReference(
+            std::string(), name_, "compiled.mach-o.executable"))));
+
+    const char product_type[] = "com.apple.product-type.tool";
+    targets_.push_back(base::WrapUnique(
+        new PBXNativeTarget(name_, std::string(), config_name_, attributes,
+                            product_type, product_reference)));
+    target_for_indexing_ = static_cast<PBXNativeTarget*>(targets_.back().get());
+  }
+
+  DCHECK(target_for_indexing_);
+  target_for_indexing_->AddFileForIndexing(file_reference);
+}
+
+void PBXProject::AddAggregateTarget(const std::string& name,
+                                    const std::string& shell_script) {
+  PBXAttributes attributes;
+  attributes["CODE_SIGNING_REQUIRED"] = "NO";
+  attributes["CONFIGURATION_BUILD_DIR"] = ".";
+  attributes["PRODUCT_NAME"] = name;
+
+  targets_.push_back(base::WrapUnique(
+      new PBXAggregateTarget(name, shell_script, config_name_, attributes)));
+}
+
+void PBXProject::AddNativeTarget(const std::string& name,
+                                 const std::string& type,
+                                 const std::string& output_name,
+                                 const std::string& output_type,
+                                 const std::string& shell_script) {
+  const base::FilePath::StringType ext =
+      base::FilePath::FromUTF8Unsafe(output_name).Extension();
+
+  PBXFileReference* product = static_cast<PBXFileReference*>(
+      products_->AddChild(base::WrapUnique(new PBXFileReference(
+          name, output_name, type.empty() ? GetSourceType(ext) : type))));
+
+  PBXAttributes attributes;
+  attributes["CODE_SIGNING_REQUIRED"] = "NO";
+  attributes["CONFIGURATION_BUILD_DIR"] = ".";
+  attributes["PRODUCT_NAME"] = name;
+
+  targets_.push_back(base::WrapUnique(new PBXNativeTarget(
+      name, shell_script, config_name_, attributes, output_type, product)));
+}
+
+void PBXProject::SetProjectDirPath(const std::string& project_dir_path) {
+  DCHECK(!project_dir_path.empty());
+  project_dir_path_.assign(project_dir_path);
+}
+
+void PBXProject::SetProjectRoot(const std::string& project_root) {
+  DCHECK(!project_root.empty());
+  project_root_.assign(project_root);
+}
+
+void PBXProject::AddTarget(std::unique_ptr<PBXTarget> target) {
+  DCHECK(target);
+  targets_.push_back(std::move(target));
+}
+
+PBXObjectClass PBXProject::Class() const {
+  return PBXProjectClass;
+}
+
+std::string PBXProject::Name() const {
+  return name_;
+}
+
+std::string PBXProject::Comment() const {
+  return "Project object";
+}
+
+void PBXProject::Visit(PBXObjectVisitor& visitor) {
+  PBXObject::Visit(visitor);
+  configurations_->Visit(visitor);
+  main_group_->Visit(visitor);
+  for (const auto& target : targets_) {
+    target->Visit(visitor);
+  }
+}
+
+void PBXProject::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {false, indent + 1};
+  out << indent_str << Reference() << " = {\n";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+  PrintProperty(out, rules, "attributes", attributes_);
+  PrintProperty(out, rules, "buildConfigurationList", configurations_);
+  PrintProperty(out, rules, "compatibilityVersion", "Xcode 3.2");
+  PrintProperty(out, rules, "developmentRegion", "English");
+  PrintProperty(out, rules, "hasScannedForEncodings", 1u);
+  PrintProperty(out, rules, "knownRegions", std::vector<std::string>({"en"}));
+  PrintProperty(out, rules, "mainGroup", main_group_);
+  PrintProperty(out, rules, "projectDirPath", project_dir_path_);
+  PrintProperty(out, rules, "projectRoot", project_root_);
+  PrintProperty(out, rules, "targets", targets_);
+  out << indent_str << "};\n";
+}
+
+// PBXShellScriptBuildPhase ---------------------------------------------------
+
+PBXShellScriptBuildPhase::PBXShellScriptBuildPhase(
+    const std::string& name,
+    const std::string& shell_script)
+    : name_("Action \"Compile and copy " + name + " via ninja\""),
+      shell_script_(shell_script) {}
+
+PBXShellScriptBuildPhase::~PBXShellScriptBuildPhase() {}
+
+PBXObjectClass PBXShellScriptBuildPhase::Class() const {
+  return PBXShellScriptBuildPhaseClass;
+}
+
+std::string PBXShellScriptBuildPhase::Name() const {
+  return name_;
+}
+
+void PBXShellScriptBuildPhase::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {false, indent + 1};
+  out << indent_str << Reference() << " = {\n";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+  PrintProperty(out, rules, "buildActionMask", 0x7fffffffu);
+  PrintProperty(out, rules, "files", EmptyPBXObjectVector());
+  PrintProperty(out, rules, "inputPaths", EmptyPBXObjectVector());
+  PrintProperty(out, rules, "name", name_);
+  PrintProperty(out, rules, "outputPaths", EmptyPBXObjectVector());
+  PrintProperty(out, rules, "runOnlyForDeploymentPostprocessing", 0u);
+  PrintProperty(out, rules, "shellPath", "/bin/sh");
+  PrintProperty(out, rules, "shellScript", shell_script_);
+  PrintProperty(out, rules, "showEnvVarsInLog", 0u);
+  out << indent_str << "};\n";
+}
+
+// PBXSourcesBuildPhase -------------------------------------------------------
+
+PBXSourcesBuildPhase::PBXSourcesBuildPhase() {}
+
+PBXSourcesBuildPhase::~PBXSourcesBuildPhase() {}
+
+void PBXSourcesBuildPhase::AddBuildFile(
+    std::unique_ptr<PBXBuildFile> build_file) {
+  files_.push_back(std::move(build_file));
+}
+
+PBXObjectClass PBXSourcesBuildPhase::Class() const {
+  return PBXSourcesBuildPhaseClass;
+}
+
+std::string PBXSourcesBuildPhase::Name() const {
+  return "Sources";
+}
+
+void PBXSourcesBuildPhase::Visit(PBXObjectVisitor& visitor) {
+  PBXBuildPhase::Visit(visitor);
+  for (const auto& file : files_) {
+    file->Visit(visitor);
+  }
+}
+
+void PBXSourcesBuildPhase::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {false, indent + 1};
+  out << indent_str << Reference() << " = {\n";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+  PrintProperty(out, rules, "buildActionMask", 0x7fffffffu);
+  PrintProperty(out, rules, "files", files_);
+  PrintProperty(out, rules, "runOnlyForDeploymentPostprocessing", 0u);
+  out << indent_str << "};\n";
+}
+
+// XCBuildConfiguration -------------------------------------------------------
+
+XCBuildConfiguration::XCBuildConfiguration(const std::string& name,
+                                           const PBXAttributes& attributes)
+    : attributes_(attributes), name_(name) {}
+
+XCBuildConfiguration::~XCBuildConfiguration() {}
+
+PBXObjectClass XCBuildConfiguration::Class() const {
+  return XCBuildConfigurationClass;
+}
+
+std::string XCBuildConfiguration::Name() const {
+  return name_;
+}
+
+void XCBuildConfiguration::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {false, indent + 1};
+  out << indent_str << Reference() << " = {\n";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+  PrintProperty(out, rules, "buildSettings", attributes_);
+  PrintProperty(out, rules, "name", name_);
+  out << indent_str << "};\n";
+}
+
+// XCConfigurationList --------------------------------------------------------
+
+XCConfigurationList::XCConfigurationList(const std::string& name,
+                                         const PBXAttributes& attributes,
+                                         const PBXObject* owner_reference)
+    : owner_reference_(owner_reference) {
+  DCHECK(owner_reference_);
+  configurations_.push_back(
+      base::WrapUnique(new XCBuildConfiguration(name, attributes)));
+}
+
+XCConfigurationList::~XCConfigurationList() {}
+
+PBXObjectClass XCConfigurationList::Class() const {
+  return XCConfigurationListClass;
+}
+
+std::string XCConfigurationList::Name() const {
+  std::stringstream buffer;
+  buffer << "Build configuration list for "
+         << ToString(owner_reference_->Class()) << " \""
+         << owner_reference_->Name() << "\"";
+  return buffer.str();
+}
+
+void XCConfigurationList::Visit(PBXObjectVisitor& visitor) {
+  PBXObject::Visit(visitor);
+  for (const auto& configuration : configurations_) {
+    configuration->Visit(visitor);
+  }
+}
+
+void XCConfigurationList::Print(std::ostream& out, unsigned indent) const {
+  const std::string indent_str(indent, '\t');
+  const IndentRules rules = {false, indent + 1};
+  out << indent_str << Reference() << " = {\n";
+  PrintProperty(out, rules, "isa", ToString(Class()));
+  PrintProperty(out, rules, "buildConfigurations", configurations_);
+  PrintProperty(out, rules, "defaultConfigurationIsVisible", 1u);
+  PrintProperty(out, rules, "defaultConfigurationName",
+                configurations_[0]->Name());
+  out << indent_str << "};\n";
+}