133 строки
4.2 KiB
Python
133 строки
4.2 KiB
Python
#!/usr/bin/env python
|
|
##
|
|
## Copyright (c) 2016, Alliance for Open Media. All rights reserved
|
|
##
|
|
## This source code is subject to the terms of the BSD 2 Clause License and
|
|
## the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License
|
|
## was not distributed with this source code in the LICENSE file, you can
|
|
## obtain it at www.aomedia.org/license/software. If the Alliance for Open
|
|
## Media Patent License 1.0 was not distributed with this source code in the
|
|
## PATENTS file, you can obtain it at www.aomedia.org/license/patent.
|
|
##
|
|
"""Classes for representing diff pieces."""
|
|
|
|
__author__ = "jkoleszar@google.com"
|
|
|
|
import re
|
|
|
|
|
|
class DiffLines(object):
|
|
"""A container for one half of a diff."""
|
|
|
|
def __init__(self, filename, offset, length):
|
|
self.filename = filename
|
|
self.offset = offset
|
|
self.length = length
|
|
self.lines = []
|
|
self.delta_line_nums = []
|
|
|
|
def Append(self, line):
|
|
l = len(self.lines)
|
|
if line[0] != " ":
|
|
self.delta_line_nums.append(self.offset + l)
|
|
self.lines.append(line[1:])
|
|
assert l+1 <= self.length
|
|
|
|
def Complete(self):
|
|
return len(self.lines) == self.length
|
|
|
|
def __contains__(self, item):
|
|
return item >= self.offset and item <= self.offset + self.length - 1
|
|
|
|
|
|
class DiffHunk(object):
|
|
"""A container for one diff hunk, consisting of two DiffLines."""
|
|
|
|
def __init__(self, header, file_a, file_b, start_a, len_a, start_b, len_b):
|
|
self.header = header
|
|
self.left = DiffLines(file_a, start_a, len_a)
|
|
self.right = DiffLines(file_b, start_b, len_b)
|
|
self.lines = []
|
|
|
|
def Append(self, line):
|
|
"""Adds a line to the DiffHunk and its DiffLines children."""
|
|
if line[0] == "-":
|
|
self.left.Append(line)
|
|
elif line[0] == "+":
|
|
self.right.Append(line)
|
|
elif line[0] == " ":
|
|
self.left.Append(line)
|
|
self.right.Append(line)
|
|
elif line[0] == "\\":
|
|
# Ignore newline messages from git diff.
|
|
pass
|
|
else:
|
|
assert False, ("Unrecognized character at start of diff line "
|
|
"%r" % line[0])
|
|
self.lines.append(line)
|
|
|
|
def Complete(self):
|
|
return self.left.Complete() and self.right.Complete()
|
|
|
|
def __repr__(self):
|
|
return "DiffHunk(%s, %s, len %d)" % (
|
|
self.left.filename, self.right.filename,
|
|
max(self.left.length, self.right.length))
|
|
|
|
|
|
def ParseDiffHunks(stream):
|
|
"""Walk a file-like object, yielding DiffHunks as they're parsed."""
|
|
|
|
file_regex = re.compile(r"(\+\+\+|---) (\S+)")
|
|
range_regex = re.compile(r"@@ -(\d+)(,(\d+))? \+(\d+)(,(\d+))?")
|
|
hunk = None
|
|
while True:
|
|
line = stream.readline()
|
|
if not line:
|
|
break
|
|
|
|
if hunk is None:
|
|
# Parse file names
|
|
diff_file = file_regex.match(line)
|
|
if diff_file:
|
|
if line.startswith("---"):
|
|
a_line = line
|
|
a = diff_file.group(2)
|
|
continue
|
|
if line.startswith("+++"):
|
|
b_line = line
|
|
b = diff_file.group(2)
|
|
continue
|
|
|
|
# Parse offset/lengths
|
|
diffrange = range_regex.match(line)
|
|
if diffrange:
|
|
if diffrange.group(2):
|
|
start_a = int(diffrange.group(1))
|
|
len_a = int(diffrange.group(3))
|
|
else:
|
|
start_a = 1
|
|
len_a = int(diffrange.group(1))
|
|
|
|
if diffrange.group(5):
|
|
start_b = int(diffrange.group(4))
|
|
len_b = int(diffrange.group(6))
|
|
else:
|
|
start_b = 1
|
|
len_b = int(diffrange.group(4))
|
|
|
|
header = [a_line, b_line, line]
|
|
hunk = DiffHunk(header, a, b, start_a, len_a, start_b, len_b)
|
|
else:
|
|
# Add the current line to the hunk
|
|
hunk.Append(line)
|
|
|
|
# See if the whole hunk has been parsed. If so, yield it and prepare
|
|
# for the next hunk.
|
|
if hunk.Complete():
|
|
yield hunk
|
|
hunk = None
|
|
|
|
# Partial hunks are a parse error
|
|
assert hunk is None
|