text: // Copyright (c) 2013 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 "gn/scope_per_file_provider.h"
  
  #include <memory>
  
  #include "gn/filesystem_utils.h"
  #include "gn/settings.h"
  #include "gn/source_file.h"
  #include "gn/value.h"
  #include "gn/variables.h"
  
  #include "last_commit_position.h"
  
  ScopePerFileProvider::ScopePerFileProvider(Scope* scope, bool allow_target_vars)
      : ProgrammaticProvider(scope), allow_target_vars_(allow_target_vars) {}
  
  ScopePerFileProvider::~ScopePerFileProvider() = default;
  
  const Value* ScopePerFileProvider::GetProgrammaticValue(
      std::string_view ident) {
    if (ident == variables::kCurrentToolchain)
      return GetCurrentToolchain();
    if (ident == variables::kDefaultToolchain)
      return GetDefaultToolchain();
    if (ident == variables::kGnVersion)
      return GetGnVersion();
    if (ident == variables::kPythonPath)
      return GetPythonPath();
  
    if (ident == variables::kRootBuildDir)
      return GetRootBuildDir();
    if (ident == variables::kRootGenDir)
      return GetRootGenDir();
    if (ident == variables::kRootOutDir)
      return GetRootOutDir();
  
    if (allow_target_vars_) {
      if (ident == variables::kTargetGenDir)
        return GetTargetGenDir();
      if (ident == variables::kTargetOutDir)
        return GetTargetOutDir();
    }
    return nullptr;
  }
  
  const Value* ScopePerFileProvider::GetCurrentToolchain() {
    if (!current_toolchain_) {
      current_toolchain_ = std::make_unique<Value>(
          nullptr,
          scope_->settings()->toolchain_label().GetUserVisibleName(false));
    }
    return current_toolchain_.get();
  }
  
  const Value* ScopePerFileProvider::GetDefaultToolchain() {
    if (!default_toolchain_) {
      default_toolchain_ = std::make_unique<Value>(
          nullptr,
          scope_->settings()->default_toolchain_label().GetUserVisibleName(
              false));
    }
    return default_toolchain_.get();
  }
  
  const Value* ScopePerFileProvider::GetGnVersion() {
    if (!gn_version_) {
      gn_version_ = std::make_unique<Value>(
          nullptr, static_cast<int64_t>(LAST_COMMIT_POSITION_NUM));
    }
    return gn_version_.get();
  }
  
  const Value* ScopePerFileProvider::GetPythonPath() {
    if (!python_path_) {
      python_path_ = std::make_unique<Value>(
          nullptr,
          FilePathToUTF8(scope_->settings()->build_settings()->python_path()));
    }
    return python_path_.get();
  }
  
  const Value* ScopePerFileProvider::GetRootBuildDir() {
    if (!root_build_dir_) {
      root_build_dir_ = std::make_unique<Value>(
          nullptr, DirectoryWithNoLastSlash(
                       scope_->settings()->build_settings()->build_dir()));
    }
    return root_build_dir_.get();
  }
  
  const Value* ScopePerFileProvider::GetRootGenDir() {
    if (!root_gen_dir_) {
      root_gen_dir_ = std::make_unique<Value>(
          nullptr, DirectoryWithNoLastSlash(GetBuildDirAsSourceDir(
                       BuildDirContext(scope_), BuildDirType::GEN)));
    }
    return root_gen_dir_.get();
  }
  
  const Value* ScopePerFileProvider::GetRootOutDir() {
    if (!root_out_dir_) {
      root_out_dir_ = std::make_unique<Value>(
          nullptr, DirectoryWithNoLastSlash(GetScopeCurrentBuildDirAsSourceDir(
                       scope_, BuildDirType::TOOLCHAIN_ROOT)));
    }
    return root_out_dir_.get();
  }
  
  const Value* ScopePerFileProvider::GetTargetGenDir() {
    if (!target_gen_dir_) {
      target_gen_dir_ = std::make_unique<Value>(
          nullptr, DirectoryWithNoLastSlash(GetScopeCurrentBuildDirAsSourceDir(
                       scope_, BuildDirType::GEN)));
    }
    return target_gen_dir_.get();
  }
  
  const Value* ScopePerFileProvider::GetTargetOutDir() {
    if (!target_out_dir_) {
      target_out_dir_ = std::make_unique<Value>(
          nullptr, DirectoryWithNoLastSlash(GetScopeCurrentBuildDirAsSourceDir(
                       scope_, BuildDirType::OBJ)));
    }
    return target_out_dir_.get();
  }
  