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      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 
     25 import json
     26 import re
     27 
     28 
     29 class 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