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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.
""" Utility to remove comments from JSON files so that they can be parsed by
json.loads."""
def _ReadString(input, start, output):
output.append('"')
in_escape = False
for pos in xrange(start, len(input)):
output.append(input[pos])
if in_escape:
in_escape = False
else:
if input[pos] == '\\':
in_escape = True
elif input[pos] == '"':
return pos + 1
return pos
def _ReadComment(input, start, output):
for pos in xrange(start, len(input)):
if input[pos] in ['\r', '\n']:
output.append(input[pos])
return pos + 1
return pos
def Nom(input):
output = []
pos = 0
while pos < len(input):
if input[pos] == '"':
pos = _ReadString(input, pos + 1, output)
elif input[pos:pos+2] == '//':
pos = _ReadComment(input, pos + 2, output)
else:
output.append(input[pos])
pos += 1
return ''.join(output)
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