|
|
# diffhelper.py - helper routines for patch
|
|
|
#
|
|
|
# Copyright 2009 Matt Mackall <mpm@selenic.com> and others
|
|
|
#
|
|
|
# This software may be used and distributed according to the terms of the
|
|
|
# GNU General Public License version 2 or any later version.
|
|
|
|
|
|
from __future__ import absolute_import
|
|
|
|
|
|
from .i18n import _
|
|
|
|
|
|
from . import (
|
|
|
error,
|
|
|
pycompat,
|
|
|
)
|
|
|
|
|
|
def addlines(fp, hunk, lena, lenb, a, b):
|
|
|
"""Read lines from fp into the hunk
|
|
|
|
|
|
The hunk is parsed into two arrays, a and b. a gets the old state of
|
|
|
the text, b gets the new state. The control char from the hunk is saved
|
|
|
when inserting into a, but not b (for performance while deleting files.)
|
|
|
"""
|
|
|
while True:
|
|
|
todoa = lena - len(a)
|
|
|
todob = lenb - len(b)
|
|
|
num = max(todoa, todob)
|
|
|
if num == 0:
|
|
|
break
|
|
|
for i in pycompat.xrange(num):
|
|
|
s = fp.readline()
|
|
|
if not s:
|
|
|
raise error.ParseError(_('incomplete hunk'))
|
|
|
if s == "\\ No newline at end of file\n":
|
|
|
fixnewline(hunk, a, b)
|
|
|
continue
|
|
|
if s == '\n' or s == '\r\n':
|
|
|
# Some patches may be missing the control char
|
|
|
# on empty lines. Supply a leading space.
|
|
|
s = ' ' + s
|
|
|
hunk.append(s)
|
|
|
if s.startswith('+'):
|
|
|
b.append(s[1:])
|
|
|
elif s.startswith('-'):
|
|
|
a.append(s)
|
|
|
else:
|
|
|
b.append(s[1:])
|
|
|
a.append(s)
|
|
|
|
|
|
def fixnewline(hunk, a, b):
|
|
|
"""Fix up the last lines of a and b when the patch has no newline at EOF"""
|
|
|
l = hunk[-1]
|
|
|
# tolerate CRLF in last line
|
|
|
if l.endswith('\r\n'):
|
|
|
hline = l[:-2]
|
|
|
else:
|
|
|
hline = l[:-1]
|
|
|
|
|
|
if hline.startswith((' ', '+')):
|
|
|
b[-1] = hline[1:]
|
|
|
if hline.startswith((' ', '-')):
|
|
|
a[-1] = hline
|
|
|
hunk[-1] = hline
|
|
|
|
|
|
def testhunk(a, b, bstart):
|
|
|
"""Compare the lines in a with the lines in b
|
|
|
|
|
|
a is assumed to have a control char at the start of each line, this char
|
|
|
is ignored in the compare.
|
|
|
"""
|
|
|
alen = len(a)
|
|
|
blen = len(b)
|
|
|
if alen > blen - bstart or bstart < 0:
|
|
|
return False
|
|
|
for i in pycompat.xrange(alen):
|
|
|
if a[i][1:] != b[i + bstart]:
|
|
|
return False
|
|
|
return True
|
|
|
|
