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# 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 json
def StripJSONComments(stream):
"""Strips //-style comments from a stream of JSON. Allows un-escaped //
inside string values.
"""
# Previously we used json_minify to strip comments, but it seems to be pretty
# slow and does more than we need. This implementation does a lot less work -
# it just strips comments from the beginning of the '//' delimiter until end
# of line, but only if we're not inside a string. For example:
#
# {"url": "http://www.example.com"}
#
# will work properly, as will:
#
# {
# "url": "http://www.example.com" // some comment
# }
result = ""
last_char = None
inside_string = False
inside_comment = False
buf = ""
for char in stream:
if inside_comment:
if char == '\n':
inside_comment = False
else:
continue
else:
if char == '/' and not inside_string:
if last_char == '/':
inside_comment = True
last_char = char
continue
else:
if last_char == '/' and not inside_string:
result += '/'
if char == '"':
inside_string = not inside_string
last_char = char
result += char
return result
def DeleteNocompileNodes(item):
def HasNocompile(thing):
return type(thing) == dict and thing.get('nocompile', False)
if type(item) == dict:
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:
return DeleteNocompileNodes(json.loads(StripJSONComments(handle.read())))
# 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])
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