Revert "Replace create_standalone_js.py with a custom GWT linker"

create_standalone_js.py

+# Copyright 2014 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.
+
+"""Converts gwt-compiled javascript to standalone javascript
+
+gwt-compiled javascript is in the form of an js file that is expected to be
+loaded into its own script tag. This reads such a compiled file and converts it
+to standalone javascript that can be loaded as Chrome does.
+"""
+
+# TODO(cjhopman): The proper way to do this is to write a gwt Linker
+# (gwt.core.ext.Linker) and use that for compilation. See
+# http://crbug.com/437113
+
+import glob
+import optparse
+import os
+import re
+import shutil
+import sys
+
+def ExtractJavascript(content, module):
+  """ Extracts javascript from within <script> tags in content. """
+  lines = content.split('\n');
+  # The generated javascript looks something like:
+  #
+  # function domdistiller() {
+  #   ...
+  # }
+  # domdistiller();<useful code here>
+  # <more useful code>
+  # <last useful code>;if (domdistiller) domdistiller.onScriptLoad(gwtOnLoad);
+  #
+  # And so we extract the useful parts and append the correct gwtOnLoad call.
+  marker = module + '();'
+  for i, l in enumerate(lines):
+    if l.startswith(marker):
+      return '\n'.join(
+        [l[len(marker):]] +
+        lines[i + 1:-1] +
+        [lines[-1].replace(
+          'if ({0}) {0}.onScriptLoad(gwtOnLoad);'.format(module),
+          'gwtOnLoad(undefined, "{0}", "", 0);'.format(module))
+        ])
+  raise Exception('Failed to find marker line')
+
+def main(argv):
+  parser = optparse.OptionParser()
+  parser.add_option('-i', '--infile')
+  parser.add_option('-o', '--outfile')
+  parser.add_option('--module', help='Name of generated javascript module.')
+  parser.add_option('--auto', action='store_true',
+      help='Calculate input/output paths based on module name.')
+  parser.add_option('--sourcemaps', action='store_true',
+      help='Also copy sourcemaps.')
+  options, _ = parser.parse_args(argv)
+
+  inpath = options.infile
+  outpath = options.outfile
+  if options.auto:
+    inpath = 'war/{0}/{0}.nocache.js'.format(options.module)
+    outpath = 'out/{0}.js'.format(options.module)
+
+  if inpath:
+    infile = open(inpath, 'r')
+  else:
+    print 'Reading input from stdin'
+    infile = sys.stdin
+
+  if outpath:
+    outfile = open(outpath, 'w')
+  else:
+    outfile = sys.stdout
+
+  compiledJs = infile.read()
+  # The compiled js expects to be running in its own iframe. This won't be the
+  # case for the standalone js.
+  compiledJs = compiledJs.replace('var $wnd = parent', 'var $wnd = window')
+  outfile.write(ExtractJavascript(compiledJs, options.module))
+  if options.sourcemaps:
+    sourcemap = 'debug/{0}/src/{0}.sourcemap'.format(options.module)
+    outfile.write('\n')
+    outfile.write('//@ sourceMappingURL=%s' % sourcemap)
+
+    insourcemap = glob.glob(
+        'war/WEB-INF/deploy/%s/symbolMaps/*sourceMap*' % options.module)[0]
+    outsourcemap = 'out/%s' % sourcemap
+    shutil.copy(insourcemap, outsourcemap)
+
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))