tools/json_schema_compiler/json_schema.py

   1 # Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 # Use of this source code is governed by a BSD-style license that can be
   3 # found in the LICENSE file.
   4
   5 import copy
   6
   7 import json_parse
   8
   9 def DeleteNodes(item, delete_key):
  10   """Deletes the given nodes in item, recursively, that have |delete_key| as
  11   an attribute.
  12   """
  13   def HasKey(thing):
  14     return json_parse.IsDict(thing) and thing.get(delete_key, False)
  15
  16   if json_parse.IsDict(item):
  17     toDelete = []
  18     for key, value in item.items():
  19       if HasKey(value):
  20         toDelete.append(key)
  21       else:
  22         DeleteNodes(value, delete_key)
  23     for key in toDelete:
  24       del item[key]
  25   elif type(item) == list:
  26     item[:] = [DeleteNodes(thing, delete_key)
  27         for thing in item if not HasKey(thing)]
  28
  29   return item
  30
  31
  32 def Load(filename):
  33   with open(filename, 'r') as handle:
  34     schemas = json_parse.Parse(handle.read())
  35   return schemas
  36
  37
  38 # A dictionary mapping |filename| to the object resulting from loading the JSON
  39 # at |filename|.
  40 _cache = {}
  41
  42
  43 def CachedLoad(filename):
  44   """Equivalent to Load(filename), but caches results for subsequent calls"""
  45   if filename not in _cache:
  46     _cache[filename] = Load(filename)
  47   # Return a copy of the object so that any changes a caller makes won't affect
  48   # the next caller.
  49   return copy.deepcopy(_cache[filename])
  50