Index: reviewbot/patching.py |
=================================================================== |
--- reviewbot/patching.py (revision 0) |
+++ reviewbot/patching.py (revision 0) |
@@ -0,0 +1,90 @@ |
+# Copyright (c) 2013 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. |
+ |
+# Copyright 2008 Google Inc. All Rights Reserved. |
+# |
+# Licensed under the Apache License, Version 2.0 (the "License"); |
+# you may not use this file except in compliance with the License. |
+# You may obtain a copy of the License at |
+# |
+# http://www.apache.org/licenses/LICENSE-2.0 |
+# |
+# Unless required by applicable law or agreed to in writing, software |
+# distributed under the License is distributed on an "AS IS" BASIS, |
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
+# See the License for the specific language governing permissions and |
+# limitations under the License. |
+ |
+"""Utility for parsing patches, originally inspired by rietveld source.""" |
+ |
+import re |
+ |
+ |
+_CHUNK_RE = re.compile(r""" |
+ @@ |
+ \s+ |
+ - |
+ (?: (\d+) (?: , (\d+) )?) |
+ \s+ |
+ \+ |
+ (?: (\d+) (?: , (\d+) )?) |
+ \s+ |
+ @@ |
+""", re.VERBOSE) |
+ |
+ |
+class PatchParseError(Exception): |
+ """Raised on parse errors.""" |
+ pass |
+ |
+ |
+def ParsePatchToLines(lines): |
+ """Parses a patch from an iterable type. |
+ |
+ Args: |
+ lines: The lines to parse. |
+ |
+ Returns: |
+ None on error, otherwise a list of 3-tuples: |
+ (old_line_no, new_line_no, line) |
+ |
+ A line number can be None if it doesn't exist in the old/new file. |
+ """ |
+ # Helper function that matches a hunk header and returns line numbers. |
+ def match_hunk_start(line): |
+ match = _CHUNK_RE.match(line) |
+ if not match: |
+ raise PatchParseError(line) |
+ return (int(match.groups()[0]), int(match.groups()[2])) |
+ |
+ iterator = lines.__iter__() |
+ try: |
+ # Skip leading lines until after we've seen one starting with '+++'. |
+ while not iterator.next().startswith('+++'): |
+ pass |
+ |
+ # Parse first hunk header. |
+ old_ln, new_ln = match_hunk_start(iterator.next()) |
+ except StopIteration: |
+ return [] |
+ |
+ # Process the actual patch lines. |
+ result = [] |
+ for line in iterator: |
+ if line[0] == '@': |
+ old_ln, new_ln = match_hunk_start(line) |
+ elif line[0] == '-': |
+ result.append((old_ln, None, line[1:])) |
+ old_ln += 1 |
+ elif line[0] == '+': |
+ result.append((None, new_ln, line[1:])) |
+ new_ln += 1 |
+ elif line[0] == ' ': |
+ result.append((old_ln, new_ln, line[1:])) |
+ old_ln += 1 |
+ new_ln += 1 |
+ else: |
+ raise PatchParseError(line) |
+ |
+ return result |
Property changes on: reviewbot/patching.py |
___________________________________________________________________ |
Added: svn:eol-style |
+ LF |