1# Copyright (C) 2011 Apple Inc. All rights reserved.
2#
3# Redistribution and use in source and binary forms, with or without
4# modification, are permitted provided that the following conditions
5# are met:
6# 1.  Redistributions of source code must retain the above copyright
7#     notice, this list of conditions and the following disclaimer.
8# 2.  Redistributions in binary form must reproduce the above copyright
9#     notice, this list of conditions and the following disclaimer in the
10#     documentation and/or other materials provided with the distribution.
11#
12# THIS SOFTWARE IS PROVIDED BY APPLE INC. AND ITS CONTRIBUTORS ``AS IS'' AND
13# ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
14# WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
15# DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR ITS CONTRIBUTORS BE LIABLE FOR
16# ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
17# DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
18# SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
19# CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
20# OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
21# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
22
23"""Checks WebKit style for JSON files."""
24
25import json
26import re
27
28
29class JSONChecker(object):
30    """Processes JSON lines for checking style."""
31
32    categories = set(('json/syntax',))
33
34    def __init__(self, file_path, handle_style_error):
35        self._handle_style_error = handle_style_error
36        self._handle_style_error.turn_off_line_filtering()
37
38    def check(self, lines):
39        try:
40            json.loads('\n'.join(lines) + '\n')
41        except ValueError, e:
42            self._handle_style_error(self.line_number_from_json_exception(e), 'json/syntax', 5, str(e))
43
44    @staticmethod
45    def line_number_from_json_exception(error):
46        match = re.search(r': line (?P<line>\d+) column \d+', str(error))
47        if not match:
48            return 0
49        return int(match.group('line'))
50