chrome/browser/resources/chromeos/chromevox/tools/generate_deps.py

   1 #!/usr/bin/env python
   2
   3 # Copyright 2014 The Chromium Authors. All rights reserved.
   4 # Use of this source code is governed by a BSD-style license that can be
   5 # found in the LICENSE file.
   6
   7 ''' Generates a deps.js file based on an input list of javascript files using
   8 Closure style provide/require calls.
   9 '''
  10
  11 import optparse
  12 import os
  13 import sys
  14
  15 from jsbundler import PathRewriter
  16
  17 _SCRIPT_DIR = os.path.realpath(os.path.dirname(__file__))
  18 _CHROME_SOURCE = os.path.realpath(
  19     os.path.join(_SCRIPT_DIR, *[os.path.pardir] * 6))
  20 sys.path.insert(0, os.path.join(
  21     _CHROME_SOURCE, ('chrome/third_party/chromevox/third_party/' +
  22                      'closure-library/closure/bin/build')))
  23 import source
  24
  25
  26 def _HasSameContent(filename, content):
  27   '''Returns true if the given file is readable and has the given content.'''
  28   try:
  29     with open(filename) as file:
  30       return file.read() == content
  31   except:
  32     # Ignore all errors and fall back on a safe bet.
  33     return False
  34
  35
  36 def main():
  37   parser = optparse.OptionParser(description=__doc__)
  38   parser.add_option('-w', '--rewrite_prefix', action='append', default=[],
  39                     dest='prefix_map', metavar='SPEC',
  40                     help=('Two path prefixes, separated by colons ' +
  41                           'specifying that a file whose (relative) path ' +
  42                           'name starts with the first prefix should have ' +
  43                           'that prefix replaced by the second prefix to ' +
  44                           'form a path relative to the output directory. ' +
  45                           'The resulting path is used in the deps mapping ' +
  46                           'file path to a list of provided and required ' +
  47                           'namespaces.'))
  48   parser.add_option('-o', '--output_file', action='store', default=[],
  49                     metavar='SPEC',
  50                     help=('Where to output the generated deps file.'))
  51   options, args = parser.parse_args()
  52
  53   path_rewriter = PathRewriter(options.prefix_map)
  54
  55   content = ''
  56   for path in args:
  57     js_deps = source.Source(source.GetFileContents(path))
  58     path = path_rewriter.RewritePath(path)
  59     content += 'goog.addDependency(\'%s\', %s, %s);\n' % (
  60         path, sorted(js_deps.provides), sorted(js_deps.requires))
  61   if _HasSameContent(options.output_file, content):
  62     return
  63   # Write the generated deps file.
  64   with open(options.output_file, 'w') as output:
  65     output.write(content)
  66
  67 if __name__ == '__main__':
  68   main()