[GN] Add support for generating Xcode projects.

tools/gn/xcode_object.h

Index: tools/gn/xcode_object.h
diff --git a/tools/gn/xcode_object.h b/tools/gn/xcode_object.h
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index 0000000000000000000000000000000000000000..25f2415f516887e8279d9f01a842b75c1f2e6723
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+++ b/tools/gn/xcode_object.h
@@ -0,0 +1,392 @@
+// 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.
+
+#ifndef TOOLS_GN_XCODE_OBJECT_H_
+#define TOOLS_GN_XCODE_OBJECT_H_
+
+#include <iosfwd>
+#include <map>
+#include <memory>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+
+// Helper classes to generate Xcode project files.
+//
+// This code is based on gyp xcodeproj_file.py generator. It does not support
+// all features of Xcode project but instead just enough to implement a hybrid
+// mode where Xcode uses external scripts to perform the compilation steps.
+//
+// See https://chromium.googlesource.com/external/gyp/+/master/pylib/gyp/xcodeproj_file.py
+// for more information on Xcode project file format.
+
+// PBXObjectClass -------------------------------------------------------------
+
+enum PBXObjectClass {
+  // Those values needs to stay sorted in alphabetic order.
+  PBXAggregateTargetClass,
+  PBXBuildFileClass,
+  PBXFileReferenceClass,
+  PBXFrameworksBuildPhaseClass,
+  PBXGroupClass,
+  PBXNativeTargetClass,
+  PBXProjectClass,
+  PBXShellScriptBuildPhaseClass,
+  PBXSourcesBuildPhaseClass,
+  XCBuildConfigurationClass,
+  XCConfigurationListClass,
+};
+
+const char* ToString(PBXObjectClass cls);
+
+// Forward-declarations -------------------------------------------------------
+
+class PBXAggregateTarget;
+class PBXBuildFile;
+class PBXFileReference;
+class PBXBuildPhase;
+class PBXFrameworksBuildPhase;
+class PBXGroup;
+class PBXNativeTarget;
+class PBXObject;
+class PBXProject;
+class PBXShellScriptBuildPhase;
+class PBXSourcesBuildPhase;
+class PBXTarget;
+class XCBuildConfiguration;
+class XCConfigurationList;
+
+using PBXAttributes = std::map<std::string, std::string>;
+
+// PBXObjectVisitor -----------------------------------------------------------
+
+class PBXObjectVisitor {
+ public:
+  PBXObjectVisitor();
+  virtual ~PBXObjectVisitor();
+  virtual void Visit(PBXObject* object) = 0;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PBXObjectVisitor);
+};
+
+// PBXObject ------------------------------------------------------------------
+
+class PBXObject {
+ public:
+  PBXObject();
+  virtual ~PBXObject();
+
+  const std::string id() const { return id_; }
+  void SetId(const std::string& id);
+
+  std::string Reference() const;
+
+  virtual PBXObjectClass Class() const = 0;
+  virtual std::string Name() const = 0;
+  virtual std::string Comment() const;
+  virtual void Visit(PBXObjectVisitor& visitor);
+  virtual void Print(std::ostream& out, unsigned indent) const = 0;
+
+ private:
+  std::string id_;
+
+  DISALLOW_COPY_AND_ASSIGN(PBXObject);
+};
+
+// PBXBuildPhase --------------------------------------------------------------
+
+class PBXBuildPhase : public PBXObject {
+ public:
+  PBXBuildPhase();
+  ~PBXBuildPhase() override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PBXBuildPhase);
+};
+
+// PBXTarget ------------------------------------------------------------------
+
+class PBXTarget : public PBXObject {
+ public:
+  PBXTarget(const std::string& name,
+            const std::string& shell_script,
+            const std::string& config_name,
+            const PBXAttributes& attributes);
+  ~PBXTarget() override;
+
+  // PXBObject implementation.
+  std::string Name() const override;
+  void Visit(PBXObjectVisitor& visitor) override;
+
+ protected:
+  std::unique_ptr<XCConfigurationList> configurations_;
+  std::vector<std::unique_ptr<PBXBuildPhase>> build_phases_;
+  PBXSourcesBuildPhase* source_build_phase_;
+  std::string name_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PBXTarget);
+};
+
+// PBXAggregateTarget ---------------------------------------------------------
+
+class PBXAggregateTarget : public PBXTarget {
+ public:
+  PBXAggregateTarget(const std::string& name,
+                     const std::string& shell_script,
+                     const std::string& config_name,
+                     const PBXAttributes& attributes);
+  ~PBXAggregateTarget() override;
+
+  // PXBObject implementation.
+  PBXObjectClass Class() const override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PBXAggregateTarget);
+};
+
+// PBXBuildFile ---------------------------------------------------------------
+
+class PBXBuildFile : public PBXObject {
+ public:
+  PBXBuildFile(const PBXFileReference* file_reference,
+               const PBXSourcesBuildPhase* build_phase);
+  ~PBXBuildFile() override;
+
+  // PXBObject implementation.
+  PBXObjectClass Class() const override;
+  std::string Name() const override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  const PBXFileReference* file_reference_;
+  const PBXSourcesBuildPhase* build_phase_;
+
+  DISALLOW_COPY_AND_ASSIGN(PBXBuildFile);
+};
+
+// PBXFileReference -----------------------------------------------------------
+
+class PBXFileReference : public PBXObject {
+ public:
+  PBXFileReference(const std::string& name,
+                   const std::string& path,
+                   const std::string& type);
+  ~PBXFileReference() override;
+
+  // PBXObject implementation.
+  PBXObjectClass Class() const override;
+  std::string Name() const override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  std::string name_;
+  std::string path_;
+  std::string type_;
+
+  DISALLOW_COPY_AND_ASSIGN(PBXFileReference);
+};
+
+// PBXFrameworksBuildPhase ----------------------------------------------------
+
+class PBXFrameworksBuildPhase : public PBXBuildPhase {
+ public:
+  PBXFrameworksBuildPhase();
+  ~PBXFrameworksBuildPhase() override;
+
+  // PBXObject implementation.
+  PBXObjectClass Class() const override;
+  std::string Name() const override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(PBXFrameworksBuildPhase);
+};
+
+// PBXGroup -------------------------------------------------------------------
+
+class PBXGroup : public PBXObject {
+ public:
+  explicit PBXGroup(const std::string& path = std::string(),
+                    const std::string& name = std::string());
+  ~PBXGroup() override;
+
+  const std::string& path() const { return path_; }
+
+  PBXObject* AddChild(std::unique_ptr<PBXObject> child);
+  PBXFileReference* AddSourceFile(const std::string& source_path);
+
+  // PBXObject implementation.
+  PBXObjectClass Class() const override;
+  std::string Name() const override;
+  void Visit(PBXObjectVisitor& visitor) override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  std::vector<std::unique_ptr<PBXObject>> children_;
+  std::string name_;
+  std::string path_;
+
+  DISALLOW_COPY_AND_ASSIGN(PBXGroup);
+};
+
+// PBXNativeTarget ------------------------------------------------------------
+
+class PBXNativeTarget : public PBXTarget {
+ public:
+  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);
+  ~PBXNativeTarget() override;
+
+  void AddFileForIndexing(const PBXFileReference* file_reference);
+
+  // PBXObject implementation.
+  PBXObjectClass Class() const override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  const PBXFileReference* product_reference_;
+  std::string product_type_;
+
+  DISALLOW_COPY_AND_ASSIGN(PBXNativeTarget);
+};
+
+// PBXProject -----------------------------------------------------------------
+
+class PBXProject : public PBXObject {
+ public:
+  PBXProject(const std::string& name,
+             const std::string& config_name,
+             const std::string& source_path,
+             const PBXAttributes& attributes);
+  ~PBXProject() override;
+
+  void AddSourceFile(const std::string& source_path);
+  void AddAggregateTarget(const std::string& name,
+                          const std::string& shell_script);
+  void AddNativeTarget(const std::string& name,
+                       const std::string& type,
+                       const std::string& output_name,
+                       const std::string& output_type,
+                       const std::string& shell_script);
+
+  void SetProjectDirPath(const std::string& project_dir_path);
+  void SetProjectRoot(const std::string& project_root);
+  void AddTarget(std::unique_ptr<PBXTarget> target);
+
+  // PBXObject implementation.
+  PBXObjectClass Class() const override;
+  std::string Name() const override;
+  std::string Comment() const override;
+  void Visit(PBXObjectVisitor& visitor) override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  PBXAttributes attributes_;
+  std::unique_ptr<XCConfigurationList> configurations_;
+  std::unique_ptr<PBXGroup> main_group_;
+  std::string project_dir_path_;
+  std::string project_root_;
+  std::vector<std::unique_ptr<PBXTarget>> targets_;
+  std::string name_;
+  std::string config_name_;
+
+  PBXGroup* sources_;
+  PBXGroup* products_;
+  PBXNativeTarget* target_for_indexing_;
+
+  DISALLOW_COPY_AND_ASSIGN(PBXProject);
+};
+
+// PBXShellScriptBuildPhase ---------------------------------------------------
+
+class PBXShellScriptBuildPhase : public PBXBuildPhase {
+ public:
+  PBXShellScriptBuildPhase(const std::string& name,
+                           const std::string& shell_script);
+  ~PBXShellScriptBuildPhase() override;
+
+  // PBXObject implementation.
+  PBXObjectClass Class() const override;
+  std::string Name() const override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  std::string name_;
+  std::string shell_script_;
+
+  DISALLOW_COPY_AND_ASSIGN(PBXShellScriptBuildPhase);
+};
+
+// PBXSourcesBuildPhase -------------------------------------------------------
+
+class PBXSourcesBuildPhase : public PBXBuildPhase {
+ public:
+  PBXSourcesBuildPhase();
+  ~PBXSourcesBuildPhase() override;
+
+  void AddBuildFile(std::unique_ptr<PBXBuildFile> build_file);
+
+  // PBXObject implementation.
+  PBXObjectClass Class() const override;
+  std::string Name() const override;
+  void Visit(PBXObjectVisitor& visitor) override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  std::vector<std::unique_ptr<PBXBuildFile>> files_;
+
+  DISALLOW_COPY_AND_ASSIGN(PBXSourcesBuildPhase);
+};
+
+// XCBuildConfiguration -------------------------------------------------------
+
+class XCBuildConfiguration : public PBXObject {
+ public:
+  XCBuildConfiguration(const std::string& name,
+                       const PBXAttributes& attributes);
+  ~XCBuildConfiguration() override;
+
+  // PBXObject implementation.
+  PBXObjectClass Class() const override;
+  std::string Name() const override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  PBXAttributes attributes_;
+  std::string name_;
+
+  DISALLOW_COPY_AND_ASSIGN(XCBuildConfiguration);
+};
+
+// XCConfigurationList --------------------------------------------------------
+
+class XCConfigurationList : public PBXObject {
+ public:
+  XCConfigurationList(const std::string& name,
+                      const PBXAttributes& attributes,
+                      const PBXObject* owner_reference);
+  ~XCConfigurationList() override;
+
+  // PBXObject implementation.
+  PBXObjectClass Class() const override;
+  std::string Name() const override;
+  void Visit(PBXObjectVisitor& visitor) override;
+  void Print(std::ostream& out, unsigned indent) const override;
+
+ private:
+  std::vector<std::unique_ptr<XCBuildConfiguration>> configurations_;
+  const PBXObject* owner_reference_;
+
+  DISALLOW_COPY_AND_ASSIGN(XCConfigurationList);
+};
+
+#endif  // TOOLS_GN_XCODE_OBJECT_H_