Update script to fetch new WebCore IDL

lib/dom/scripts/idlsync.py

Index: lib/dom/scripts/idlsync.py
diff --git a/lib/dom/scripts/idlsync.py b/lib/dom/scripts/idlsync.py
new file mode 100755
index 0000000000000000000000000000000000000000..930698fc2098fdb9ce841eec5a06132b39d9fe30
--- /dev/null
+++ b/lib/dom/scripts/idlsync.py
@@ -0,0 +1,119 @@
+#!/usr/bin/python
+# Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+import optparse
+import os
+import os.path
+import re
+import shutil
+import subprocess
+import sys
+
+SCRIPT_PATH = os.path.abspath(os.path.dirname(__file__))
+DART_PATH = os.path.abspath(os.path.join(SCRIPT_PATH, '..', '..', '..'))
+
+# Path to install latest IDL.
+IDL_PATH = os.path.join(DART_PATH, 'third_party', 'WebCore')
+
+# Whitelist of files to keep.
+WHITELIST = [
+    r'LICENSE(\S+)',
+    r'(\S+)\.idl']
+
+# README file to generate.
+README = os.path.join(IDL_PATH, 'README')
+
+# SVN URL to latest Dartium version of WebKit.
+DEPS = 'http://dart.googlecode.com/svn/branches/bleeding_edge/deps/dartium.deps/DEPS'
+URL_PATTERN = r'"dartium_webkit_trunk": "(\S+)",'
+REV_PATTERN = r'"dartium_webkit_revision": "(\d+)",'
+WEBCORE_SUBPATH = 'Source/WebCore'
+
+
+def RunCommand(cmd):
+  """Executes a shell command and return its stdout."""
+  print ' '.join(cmd)
+  pipe = subprocess.Popen(cmd, stdout=subprocess.PIPE, stderr=subprocess.PIPE)
+  output = pipe.communicate()
+  if pipe.returncode == 0:
+    return output[0]
+  else:
+    print output[1]
+    print 'FAILED. RET_CODE=%d' % pipe.returncode
+    sys.exit(pipe.returncode)
+
+
+def GetWebkitSvnRevision():
+  """Returns a tuple with the (dartium webkit repo, latest revision)."""
+  deps = RunCommand(['svn', 'cat', DEPS])
+  url = re.search(URL_PATTERN, deps).group(1)
+  revision = re.search(REV_PATTERN, deps).group(1)
+  return (url, revision)
+
+
+def RefreshIDL(url, revision):
+  """Refreshes the IDL to specific WebKit url / revision."""
+  cwd = os.getcwd()
+  try:
+    shutil.rmtree(IDL_PATH)
+    os.chdir(os.path.dirname(IDL_PATH))
+    RunCommand(['svn', 'export', '-r', revision, url + '/' + WEBCORE_SUBPATH])
+  finally:
+    os.chdir(cwd)
+
+
+def PruneExtraFiles():
+  """Removes all files that do not match the whitelist."""
+  pattern = re.compile(reduce(lambda x,y: '%s|%s' % (x,y),
+                              map(lambda z: '(%s)' % z, WHITELIST)))
+  for (root, dirs, files) in os.walk(IDL_PATH, topdown=False):
+    for f in files:
+      if not pattern.match(f):
+        os.remove(os.path.join(root, f))
+    for d in dirs:
+      dirpath = os.path.join(root, d)
+      if not os.listdir(dirpath):
+        shutil.rmtree(dirpath)
+
+
+def ParseOptions():
+  parser = optparse.OptionParser()
+  parser.add_option('--revision', '-r', dest='revision',
+                    help='Revision to install', default=None)
+  args, _ = parser.parse_args()
+  return args.revision
+
+
+def GenerateReadme(url, revision):
+  readme = """This directory contains a copy of WebKit/WebCore IDL files.
+See the attached LICENSE-* files in this directory.
+
+Please do not modify the files here.  They are periodically copied
+using the script: $DART_ROOT/lib/dom/scripts/%(script)s
+
+The current version corresponds to:
+URL: %(url)s
+Current revision: %(revision)s
+""" % {
+    'script': os.path.basename(__file__),
+    'url': url,
+    'revision': revision }
+  out = open(README, 'w')
+  out.write(readme)
+  out.close()
+
+
+def main():
+  revision = ParseOptions()
+  url, latest = GetWebkitSvnRevision()
+  if not revision:
+    revision = latest
+  RefreshIDL(url, revision)
+  PruneExtraFiles()
+  GenerateReadme(url, revision)
+
+
+if __name__ == '__main__':
+  main()