text: # Copyright 2015 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.
  
  """Chromium presubmit script for third_party/polymer/v1_0.
  
  See http://dev.chromium.org/developers/how-tos/depottools/presubmit-scripts
  for more details on the presubmit API built into depot_tools.
  """
  
  import os
  import json
  
  def _CheckBowerDependencies(input_api, output_api):
    os_path = input_api.os_path
    cwd = input_api.PresubmitLocalPath()
    components_dir = os_path.join(cwd, 'components-chromium')
    bower_json_path = os_path.join(cwd, 'bower.json')
  
    for f in input_api.AffectedFiles():
      p = f.AbsoluteLocalPath()
      if p == bower_json_path or p.startswith(components_dir):
        break
    else:
        return []
  
    bower_dependencies = \
        set(json.load(open(bower_json_path))['dependencies'].keys())
    installed_components = set(p for p in os.listdir(components_dir))
    # Add web-animations-js because we keep it in a separate directory
    # '../third_party/web-animations-js'.
    installed_components.add('web-animations-js')
  
    if bower_dependencies == installed_components:
      return []
  
    problems = []
  
    if installed_components - bower_dependencies:
      problems.append(output_api.PresubmitError(
          'Found components that are not listed in bower.json.',
          items = list(installed_components - bower_dependencies)))
  
    if bower_dependencies - installed_components:
      problems.append(output_api.PresubmitError(
          'Some of the Bower dependencies are not installed.',
          items = list(bower_dependencies - installed_components)))
  
    return problems
  
  
  def CheckChangeOnUpload(input_api, output_api):
    return _CheckBowerDependencies(input_api, output_api)
  
  
  def CheckChangeOnCommit(input_api, output_api):
    return _CheckBowerDependencies(input_api, output_api)
  