Import chrome idl into third_party

third_party/chrome/tools/json_schema.py

+# 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.
+
+import copy
+import os
+import sys
+
+import json_parse
+import schema_util
+
+def DeleteNocompileNodes(item):
+  def HasNocompile(thing):
+    return json_parse.IsDict(thing) and thing.get('nocompile', False)
+
+  if json_parse.IsDict(item):
+    toDelete = []
+    for key, value in item.items():
+      if HasNocompile(value):
+        toDelete.append(key)
+      else:
+        DeleteNocompileNodes(value)
+    for key in toDelete:
+      del item[key]
+  elif type(item) == list:
+    item[:] = [DeleteNocompileNodes(thing)
+        for thing in item if not HasNocompile(thing)]
+
+  return item
+
+def Load(filename):
+  with open(filename, 'r') as handle:
+    schemas = json_parse.Parse(handle.read())
+  return schemas
+
+# A dictionary mapping |filename| to the object resulting from loading the JSON
+# at |filename|.
+_cache = {}
+
+def CachedLoad(filename):
+  """Equivalent to Load(filename), but caches results for subsequent calls"""
+  if filename not in _cache:
+    _cache[filename] = Load(filename)
+  # Return a copy of the object so that any changes a caller makes won't affect
+  # the next caller.
+  return copy.deepcopy(_cache[filename])