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#!/usr/bin/env python
# Copyright 2014 The Chromium Authors
# Use of this source code is governed by a BSD-style license that can be
# found in the LICENSE file.
''' Generates a deps.js file based on an input list of javascript files using
Closure style provide/require calls.
'''
import optparse
import os
import sys
from jsbundler import PathRewriter
_SCRIPT_DIR = os.path.realpath(os.path.dirname(__file__))
_CHROME_SOURCE = os.path.realpath(
os.path.join(_SCRIPT_DIR, *[os.path.pardir] * 6))
sys.path.insert(
0,
os.path.join(_CHROME_SOURCE, ('third_party/chromevox/third_party/' +
'closure-library/closure/bin/build')))
import source
def _HasSameContent(filename, content):
'''Returns true if the given file is readable and has the given content.'''
try:
with open(filename) as file:
return file.read() == content
except:
# Ignore all errors and fall back on a safe bet.
return False
def main():
parser = optparse.OptionParser(description=__doc__)
parser.add_option(
'-w',
'--rewrite_prefix',
action='append',
default=[],
dest='prefix_map',
metavar='SPEC',
help=('Two path prefixes, separated by colons ' +
'specifying that a file whose (relative) path ' +
'name starts with the first prefix should have ' +
'that prefix replaced by the second prefix to ' +
'form a path relative to the output directory. ' +
'The resulting path is used in the deps mapping ' +
'file path to a list of provided and required ' + 'namespaces.'))
parser.add_option(
'-o',
'--output_file',
action='store',
default=[],
metavar='SPEC',
help=('Where to output the generated deps file.'))
options, args = parser.parse_args()
path_rewriter = PathRewriter(options.prefix_map)
content = ''
for path in args:
js_deps = source.Source(source.GetFileContents(path))
path = path_rewriter.RewritePath(path)
content += 'goog.addDependency(\'%s\', %s, %s);\n' % (
path, sorted(js_deps.provides), sorted(js_deps.requires))
if _HasSameContent(options.output_file, content):
return
# Write the generated deps file.
with open(options.output_file, 'w') as output:
output.write(content)
if __name__ == '__main__':
main()
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