Add support for messages.json format used to localize Chrome extensions.

grit/format/chrome_messages_json.py

Index: grit/format/chrome_messages_json.py
diff --git a/grit/format/chrome_messages_json.py b/grit/format/chrome_messages_json.py
new file mode 100644
index 0000000000000000000000000000000000000000..6677c6eac378615bbe71089ac4b1394b69c6716f
--- /dev/null
+++ b/grit/format/chrome_messages_json.py
@@ -0,0 +1,41 @@
+#!/usr/bin/env python
+# Copyright (c) 2012 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.
+
+"""Formats as a .json file that can be used to localize Google Chrome
+extensions."""
+
+import re
+import types
+
+from grit import util
+from grit.format import interface
+from grit.node import message
+
+class StringTable(interface.ItemFormatter):
+  """Writes out the string table."""
+
+  def Format(self, item, lang='en', output_dir='.'):
+    out = []
+    out.append('{\n')
+
+    format = ('  "%s": {\n'
+              '    "message": "%s"\n'
+              '  }')
+    for child in item.children:
+      if isinstance(child, message.MessageNode):
+        loc_message = child.Translate(lang)
+        loc_message = re.sub(r'\\', r'\\\\', loc_message)
+        loc_message = re.sub(r'"', r'\"', loc_message)
+
+        id = child.attrs['name']
+        if id.startswith('IDR_'):
+          id = id[4:]
+
+        if len(out) > 1:
+          out.append(',\n')
+        out.append(format % (id, loc_message))
+
+    out.append('\n}\n')
+    return ''.join(out)