Initial source commit to grit-i18n project.

grit/gather/json_loader.py

+# Copyright (c) 2010 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.
+
+
+import types
+
+from grit.gather import interface
+from grit import util
+
+
+class JsonLoader(interface.GathererBase):
+  '''A simple gatherer that loads and parses a JSON file.'''
+
+  def __init__(self, json_text):
+    '''Initializes a gatherer object with JSON input.
+
+    Args:
+      json_text: A string containing a JSON expression.
+    '''
+    super(type(self), self).__init__()
+    self._json_text = json_text
+    self._data = None
+
+  def Parse(self):
+    '''Parses the text of self._json_text into the data structure in
+    self._data.
+    '''
+    globs = {}
+    exec('data = ' + self._json_text, globs)
+    self._data = globs['data']
+
+  def GetData(self):
+    '''Returns the parsed JSON data.'''
+    return self._data
+
+  def FromFile(filename_or_stream, extkey, encoding):
+    '''Creates a JSONLoader instance from a file or stream.
+
+    Args:
+      filename_or_stream: The source of JSON data.
+      extkey: Unused, see interface.py.
+      encoding: The encoding used in the JSON file. (Note that it should
+        not contain localized strings.)
+
+    Returns:
+      The JSONLoader instance holding the JSON data unparsed.
+    '''
+    if isinstance(filename_or_stream, types.StringTypes):
+      filename_or_stream = \
+          util.WrapInputStream(file(filename_or_stream, 'rU'), encoding)
+    return JsonLoader(filename_or_stream.read())
+  FromFile = staticmethod(FromFile)