Revert of [GN] Add JSON project writer

tools/gn/json_project_writer.cc

-// Copyright (c) 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/json_project_writer.h"
-
-#include <iostream>
-
-#include "base/command_line.h"
-#include "base/json/json_writer.h"
-#include "base/memory/ptr_util.h"
-#include "base/strings/string_number_conversions.h"
-#include "tools/gn/builder.h"
-#include "tools/gn/commands.h"
-#include "tools/gn/deps_iterator.h"
-#include "tools/gn/desc_builder.h"
-#include "tools/gn/exec_process.h"
-#include "tools/gn/filesystem_utils.h"
-#include "tools/gn/settings.h"
-
-// Structure of JSON output file
-// {
-//   "build_settings" = {
-//     "root_path" : "absolute path of project root",
-//     "build_dir" : "build directory (project relative)",
-//     "default_toolchain" : "name of default toolchain"
-//   }
-//   "targets" = {
-//      "target x name" : { target x properties },
-//      "target y name" : { target y properties },
-//      ...
-//    }
-// }
-// See desc_builder.cc for overview of target properties
-
-namespace {
-
-void AddTargetDependencies(const Target* target,
-                           std::set<const Target*>* deps) {
-  for (const auto& pair : target->GetDeps(Target::DEPS_LINKED)) {
-    if (deps->find(pair.ptr) == deps->end()) {
-      deps->insert(pair.ptr);
-      AddTargetDependencies(pair.ptr, deps);
-    }
-  }
-}
-
-// Filters targets according to filter string; Will also recursively
-// add dependent targets.
-bool FilterTargets(const BuildSettings* build_settings,
-                   std::vector<const Target*>& all_targets,
-                   std::vector<const Target*>* targets,
-                   const std::string& dir_filter_string,
-                   Err* err) {
-  if (dir_filter_string.empty()) {
-    *targets = all_targets;
-  } else {
-    targets->reserve(all_targets.size());
-    std::vector<LabelPattern> filters;
-    if (!commands::FilterPatternsFromString(build_settings, dir_filter_string,
-                                            &filters, err)) {
-      return false;
-    }
-    commands::FilterTargetsByPatterns(all_targets, filters, targets);
-
-    std::set<const Target*> target_set(targets->begin(), targets->end());
-    for (const auto* target : *targets)
-      AddTargetDependencies(target, &target_set);
-
-    targets->clear();
-    targets->insert(targets->end(), target_set.begin(), target_set.end());
-  }
-
-  // Sort the list of targets per-label to get a consistent ordering of them
-  // in the generated project (and thus stability of the file generated).
-  std::sort(targets->begin(), targets->end(),
-            [](const Target* a, const Target* b) {
-              return a->label().name() < b->label().name();
-            });
-
-  return true;
-}
-
-std::string RenderJSON(const BuildSettings* build_settings,
-                       const Builder* builder,
-                       std::vector<const Target*>& all_targets) {
-  Label default_toolchain_label;
-
-  auto targets = base::WrapUnique(new base::DictionaryValue());
-  for (const auto* target : all_targets) {
-    if (default_toolchain_label.is_null())
-      default_toolchain_label = target->settings()->default_toolchain_label();
-    auto description =
-        DescBuilder::DescriptionForTarget(target, "", false, false, false);
-    // Outputs need to be asked for separately.
-    auto outputs = DescBuilder::DescriptionForTarget(target, "source_outputs",
-                                                     false, false, false);
-    base::DictionaryValue* outputs_value = nullptr;
-    if (outputs->GetDictionary("source_outputs", &outputs_value) &&
-        !outputs_value->empty()) {
-      description->MergeDictionary(outputs.get());
-    }
-    targets->Set(target->label().GetUserVisibleName(default_toolchain_label),
-                 std::move(description));
-  }
-
-  auto settings = base::WrapUnique(new base::DictionaryValue());
-  settings->SetString("root_path", build_settings->root_path_utf8());
-  settings->SetString("build_dir", build_settings->build_dir().value());
-  settings->SetString("default_toolchain",
-                      default_toolchain_label.GetUserVisibleName(false));
-
-  auto output = base::WrapUnique(new base::DictionaryValue());
-  output->Set("targets", std::move(targets));
-  output->Set("build_settings", std::move(settings));
-
-  std::string s;
-  base::JSONWriter::WriteWithOptions(
-      *output.get(), base::JSONWriter::OPTIONS_PRETTY_PRINT, &s);
-  return s;
-}
-
-bool InvokePython(const BuildSettings* build_settings,
-                  const base::FilePath& python_script_path,
-                  const std::string& python_script_extra_args,
-                  const base::FilePath& output_path,
-                  bool quiet,
-                  Err* err) {
-  const base::FilePath& python_path = build_settings->python_path();
-  base::CommandLine cmdline(python_path);
-  cmdline.AppendArg("--");
-  cmdline.AppendArgPath(python_script_path);
-  cmdline.AppendArgPath(output_path);
-  if (!python_script_extra_args.empty()) {
-    cmdline.AppendArg(python_script_extra_args);
-  }
-  base::FilePath startup_dir =
-      build_settings->GetFullPath(build_settings->build_dir());
-
-  std::string output;
-  std::string stderr_output;
-
-  int exit_code = 0;
-  if (!internal::ExecProcess(cmdline, startup_dir, &output, &stderr_output,
-                             &exit_code)) {
-    *err =
-        Err(Location(), "Could not execute python.",
-            "I was trying to execute \"" + FilePathToUTF8(python_path) + "\".");
-    return false;
-  }
-
-  if (!quiet) {
-    std::cout << output;
-    std::cerr << stderr_output;
-  }
-
-  if (exit_code != 0) {
-    *err = Err(Location(), "Python has quit with exit code " +
-                               base::IntToString(exit_code) + ".");
-    return false;
-  }
-
-  return true;
-}
-
-}  // namespace
-
-bool JSONProjectWriter::RunAndWriteFiles(
-    const BuildSettings* build_settings,
-    const Builder* builder,
-    const std::string& file_name,
-    const std::string& exec_script,
-    const std::string& exec_script_extra_args,
-    const std::string& dir_filter_string,
-    bool quiet,
-    Err* err) {
-  SourceFile output_file = build_settings->build_dir().ResolveRelativeFile(
-      Value(nullptr, file_name), err);
-  if (output_file.is_null()) {
-    return false;
-  }
-
-  base::FilePath output_path = build_settings->GetFullPath(output_file);
-
-  std::vector<const Target*> all_targets = builder->GetAllResolvedTargets();
-  std::vector<const Target*> targets;
-  if (!FilterTargets(build_settings, all_targets, &targets, dir_filter_string,
-                     err)) {
-    return false;
-  }
-
-  std::string json = RenderJSON(build_settings, builder, targets);
-  if (!ContentsEqual(output_path, json)) {
-    if (!WriteFileIfChanged(output_path, json, err)) {
-      return false;
-    }
-
-    if (!exec_script.empty()) {
-      SourceFile script_file;
-      if (exec_script[0] != '/') {
-        // Relative path, assume the base is in build_dir.
-        script_file = build_settings->build_dir().ResolveRelativeFile(
-            Value(nullptr, exec_script), err);
-        if (script_file.is_null()) {
-          return false;
-        }
-      } else {
-        script_file = SourceFile(exec_script);
-      }
-      base::FilePath script_path = build_settings->GetFullPath(script_file);
-      return InvokePython(build_settings, script_path, exec_script_extra_args,
-                          output_path, quiet, err);
-    }
-  }
-
-  return true;
-}