128 строки
4.0 KiB
Python
128 строки
4.0 KiB
Python
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#!/usr/bin/env python
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## Copyright (c) 2012 The WebM project authors. All Rights Reserved.
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##
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## Use of this source code is governed by a BSD-style license
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## that can be found in the LICENSE file in the root of the source
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## tree. An additional intellectual property rights grant can be found
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## in the file PATENTS. All contributing project authors may
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## be found in the AUTHORS file in the root of the source tree.
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##
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"""Classes for representing diff pieces."""
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__author__ = "jkoleszar@google.com"
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import re
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class DiffLines(object):
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"""A container for one half of a diff."""
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def __init__(self, filename, offset, length):
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self.filename = filename
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self.offset = offset
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self.length = length
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self.lines = []
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self.delta_line_nums = []
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def Append(self, line):
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l = len(self.lines)
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if line[0] != " ":
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self.delta_line_nums.append(self.offset + l)
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self.lines.append(line[1:])
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assert l+1 <= self.length
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def Complete(self):
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return len(self.lines) == self.length
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def __contains__(self, item):
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return item >= self.offset and item <= self.offset + self.length - 1
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class DiffHunk(object):
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"""A container for one diff hunk, consisting of two DiffLines."""
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def __init__(self, header, file_a, file_b, start_a, len_a, start_b, len_b):
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self.header = header
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self.left = DiffLines(file_a, start_a, len_a)
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self.right = DiffLines(file_b, start_b, len_b)
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self.lines = []
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def Append(self, line):
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"""Adds a line to the DiffHunk and its DiffLines children."""
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if line[0] == "-":
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self.left.Append(line)
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elif line[0] == "+":
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self.right.Append(line)
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elif line[0] == " ":
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self.left.Append(line)
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self.right.Append(line)
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else:
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assert False, ("Unrecognized character at start of diff line "
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"%r" % line[0])
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self.lines.append(line)
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def Complete(self):
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return self.left.Complete() and self.right.Complete()
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def __repr__(self):
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return "DiffHunk(%s, %s, len %d)" % (
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self.left.filename, self.right.filename,
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max(self.left.length, self.right.length))
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def ParseDiffHunks(stream):
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"""Walk a file-like object, yielding DiffHunks as they're parsed."""
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file_regex = re.compile(r"(\+\+\+|---) (\S+)")
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range_regex = re.compile(r"@@ -(\d+)(,(\d+))? \+(\d+)(,(\d+))?")
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hunk = None
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while True:
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line = stream.readline()
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if not line:
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break
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if hunk is None:
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# Parse file names
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diff_file = file_regex.match(line)
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if diff_file:
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if line.startswith("---"):
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a_line = line
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a = diff_file.group(2)
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continue
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if line.startswith("+++"):
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b_line = line
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b = diff_file.group(2)
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continue
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# Parse offset/lengths
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diffrange = range_regex.match(line)
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if diffrange:
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if diffrange.group(2):
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start_a = int(diffrange.group(1))
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len_a = int(diffrange.group(3))
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else:
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start_a = 1
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len_a = int(diffrange.group(1))
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if diffrange.group(5):
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start_b = int(diffrange.group(4))
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len_b = int(diffrange.group(6))
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else:
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start_b = 1
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len_b = int(diffrange.group(4))
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header = [a_line, b_line, line]
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hunk = DiffHunk(header, a, b, start_a, len_a, start_b, len_b)
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else:
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# Add the current line to the hunk
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hunk.Append(line)
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# See if the whole hunk has been parsed. If so, yield it and prepare
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# for the next hunk.
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if hunk.Complete():
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yield hunk
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hunk = None
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# Partial hunks are a parse error
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assert hunk is None
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