1 # Copyright (C) 2011 Google Inc. All rights reserved.
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4 # modification, are permitted provided that the following conditions are
7 # * Redistributions of source code must retain the above copyright
8 # notice, this list of conditions and the following disclaimer.
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15 # this software without specific prior written permission.
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30 class AmountChangedPattern:
31 def __init__(self, compile_regex, index_for_zero_value):
32 self._regex = compile_regex
33 self._index_for_zero_value = index_for_zero_value
35 def match(self, path, diff_file):
36 examined_strings = set()
37 for diff_line in diff_file:
38 if diff_line[self._index_for_zero_value]:
40 match = self._regex.search(diff_line[2])
43 matching_string = match.group(0)
44 if matching_string in examined_strings:
46 if self._instance_difference(diff_file, matching_string) > 0:
48 # Avoid reprocessing this same string.
49 examined_strings.add(matching_string)
52 def _instance_difference(self, diff_file, matching_string):
53 '''Returns the difference between the number of string occurences in
54 the added lines and deleted lines (which one is subtracted from the
55 other depends on _index_for_zero_value).'''
57 for diff_line in diff_file:
58 # If the line is unchanged, then don't examine it.
59 if diff_line[self._index_for_zero_value] and diff_line[1 - self._index_for_zero_value]:
61 location_found = -len(matching_string)
63 location_found = diff_line[2].find(matching_string, location_found + len(matching_string))
64 if location_found == -1:
66 if not diff_line[self._index_for_zero_value]: