mirror of
https://github.com/classilla/tenfourfox.git
synced 2024-11-04 10:05:51 +00:00
181 lines
7.0 KiB
Python
181 lines
7.0 KiB
Python
# Copyright (C) 2009 Google Inc. All rights reserved.
|
|
#
|
|
# Redistribution and use in source and binary forms, with or without
|
|
# modification, are permitted provided that the following conditions are
|
|
# met:
|
|
#
|
|
# * Redistributions of source code must retain the above copyright
|
|
# notice, this list of conditions and the following disclaimer.
|
|
# * Redistributions in binary form must reproduce the above
|
|
# copyright notice, this list of conditions and the following disclaimer
|
|
# in the documentation and/or other materials provided with the
|
|
# distribution.
|
|
# * Neither the name of Google Inc. nor the names of its
|
|
# contributors may be used to endorse or promote products derived from
|
|
# this software without specific prior written permission.
|
|
#
|
|
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
|
|
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
|
|
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
|
|
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
|
|
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
|
|
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
|
|
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
|
|
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
|
|
"""WebKit's Python module for interacting with patches."""
|
|
|
|
import logging
|
|
import re
|
|
|
|
|
|
_regexp_compile_cache = {}
|
|
|
|
|
|
def match(pattern, string):
|
|
"""Matches the string with the pattern, caching the compiled regexp."""
|
|
if not pattern in _regexp_compile_cache:
|
|
_regexp_compile_cache[pattern] = re.compile(pattern)
|
|
return _regexp_compile_cache[pattern].match(string)
|
|
|
|
|
|
def git_diff_to_svn_diff(line):
|
|
"""Converts a git formatted diff line to a svn formatted line.
|
|
|
|
Args:
|
|
line: A string representing a line of the diff.
|
|
"""
|
|
conversion_patterns = (("^diff --git a/(.+) b/(?P<FilePath>.+)", lambda matched: "Index: " + matched.group('FilePath') + "\n"),
|
|
("^new file.*", lambda matched: "\n"),
|
|
("^index [0-9a-f]{7}\.\.[0-9a-f]{7} [0-9]{6}", lambda matched: "===================================================================\n"),
|
|
("^--- a/(?P<FilePath>.+)", lambda matched: "--- " + matched.group('FilePath') + "\n"),
|
|
("^\+\+\+ b/(?P<FilePath>.+)", lambda matched: "+++ " + matched.group('FilePath') + "\n"))
|
|
|
|
for pattern, conversion in conversion_patterns:
|
|
matched = match(pattern, line)
|
|
if matched:
|
|
return conversion(matched)
|
|
return line
|
|
|
|
|
|
def get_diff_converter(first_diff_line):
|
|
"""Gets a converter function of diff lines.
|
|
|
|
Args:
|
|
first_diff_line: The first filename line of a diff file.
|
|
If this line is git formatted, we'll return a
|
|
converter from git to SVN.
|
|
"""
|
|
if match(r"^diff --git a/", first_diff_line):
|
|
return git_diff_to_svn_diff
|
|
return lambda input: input
|
|
|
|
|
|
_INITIAL_STATE = 1
|
|
_DECLARED_FILE_PATH = 2
|
|
_PROCESSING_CHUNK = 3
|
|
|
|
|
|
class DiffFile:
|
|
"""Contains the information for one file in a patch.
|
|
|
|
The field "lines" is a list which contains tuples in this format:
|
|
(deleted_line_number, new_line_number, line_string)
|
|
If deleted_line_number is zero, it means this line is newly added.
|
|
If new_line_number is zero, it means this line is deleted.
|
|
"""
|
|
|
|
def __init__(self, filename):
|
|
self.filename = filename
|
|
self.lines = []
|
|
|
|
def add_new_line(self, line_number, line):
|
|
self.lines.append((0, line_number, line))
|
|
|
|
def add_deleted_line(self, line_number, line):
|
|
self.lines.append((line_number, 0, line))
|
|
|
|
def add_unchanged_line(self, deleted_line_number, new_line_number, line):
|
|
self.lines.append((deleted_line_number, new_line_number, line))
|
|
|
|
|
|
class DiffParser:
|
|
"""A parser for a patch file.
|
|
|
|
The field "files" is a dict whose key is the filename and value is
|
|
a DiffFile object.
|
|
"""
|
|
|
|
def __init__(self, diff_input):
|
|
"""Parses a diff.
|
|
|
|
Args:
|
|
diff_input: An iterable object.
|
|
"""
|
|
state = _INITIAL_STATE
|
|
|
|
self.files = {}
|
|
self.status_line = None
|
|
self.patch_description = None
|
|
current_file = None
|
|
old_diff_line = None
|
|
new_diff_line = None
|
|
for line in diff_input:
|
|
line = line.rstrip("\n")
|
|
if state == _INITIAL_STATE:
|
|
transform_line = get_diff_converter(line)
|
|
line = transform_line(line)
|
|
|
|
comment_line = match(r"^\#", line)
|
|
if comment_line:
|
|
continue
|
|
|
|
file_declaration = match(r"^Index: (?P<FilePath>.+)", line)
|
|
if file_declaration:
|
|
filename = file_declaration.group('FilePath')
|
|
current_file = DiffFile(filename)
|
|
self.files[filename] = current_file
|
|
state = _DECLARED_FILE_PATH
|
|
continue
|
|
|
|
lines_changed = match(r"^@@ -(?P<OldStartLine>\d+)(,\d+)? \+(?P<NewStartLine>\d+)(,\d+)? @@", line)
|
|
if lines_changed:
|
|
if state != _DECLARED_FILE_PATH and state != _PROCESSING_CHUNK:
|
|
logging.error('Unexpected line change without file path declaration: %r' % line)
|
|
old_diff_line = int(lines_changed.group('OldStartLine'))
|
|
new_diff_line = int(lines_changed.group('NewStartLine'))
|
|
state = _PROCESSING_CHUNK
|
|
continue
|
|
|
|
if state == _PROCESSING_CHUNK:
|
|
if line.startswith('+'):
|
|
current_file.add_new_line(new_diff_line, line[1:])
|
|
new_diff_line += 1
|
|
elif line.startswith('-'):
|
|
current_file.add_deleted_line(old_diff_line, line[1:])
|
|
old_diff_line += 1
|
|
elif line.startswith(' '):
|
|
current_file.add_unchanged_line(old_diff_line, new_diff_line, line[1:])
|
|
old_diff_line += 1
|
|
new_diff_line += 1
|
|
elif line == '\\ No newline at end of file':
|
|
# Nothing to do. We may still have some added lines.
|
|
pass
|
|
else:
|
|
logging.error('Unexpected diff format when parsing a chunk: %r' % line)
|
|
|
|
# Patch description
|
|
if state == _INITIAL_STATE:
|
|
if not self.status_line:
|
|
self.status_line = line
|
|
else:
|
|
if not self.patch_description:
|
|
# Skip the first blank line after the patch description
|
|
if line != "":
|
|
self.patch_description = line
|
|
else:
|
|
self.patch_description = self.patch_description + "\n" + line
|