dirstate: introduce a symbolic constant for the NONNORMAL marker
This is going to be clearer and easier to track than -1. Ultimately I would
like to get ride of this special value everywhere but in the lower level,
however we need to clarify the API first. This changeset is part of such
clarification.
Differential Revision: https://phab.mercurial-scm.org/D10927
# Copyright (C) 2004, 2005 Canonical Ltd
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, see <http://www.gnu.org/licenses/>.
# mbp: "you know that thing where cvs gives you conflict markers?"
# s: "i hate that."
from __future__ import absolute_import
from .i18n import _
from .node import nullrev
from . import (
error,
mdiff,
pycompat,
util,
)
from .utils import stringutil
class CantReprocessAndShowBase(Exception):
pass
def intersect(ra, rb):
"""Given two ranges return the range where they intersect or None.
>>> intersect((0, 10), (0, 6))
(0, 6)
>>> intersect((0, 10), (5, 15))
(5, 10)
>>> intersect((0, 10), (10, 15))
>>> intersect((0, 9), (10, 15))
>>> intersect((0, 9), (7, 15))
(7, 9)
"""
assert ra[0] <= ra[1]
assert rb[0] <= rb[1]
sa = max(ra[0], rb[0])
sb = min(ra[1], rb[1])
if sa < sb:
return sa, sb
else:
return None
def compare_range(a, astart, aend, b, bstart, bend):
"""Compare a[astart:aend] == b[bstart:bend], without slicing."""
if (aend - astart) != (bend - bstart):
return False
for ia, ib in zip(
pycompat.xrange(astart, aend), pycompat.xrange(bstart, bend)
):
if a[ia] != b[ib]:
return False
else:
return True
class Merge3Text(object):
"""3-way merge of texts.
Given strings BASE, OTHER, THIS, tries to produce a combined text
incorporating the changes from both BASE->OTHER and BASE->THIS."""
def __init__(self, basetext, atext, btext, base=None, a=None, b=None):
self.basetext = basetext
self.atext = atext
self.btext = btext
if base is None:
base = mdiff.splitnewlines(basetext)
if a is None:
a = mdiff.splitnewlines(atext)
if b is None:
b = mdiff.splitnewlines(btext)
self.base = base
self.a = a
self.b = b
def merge_lines(
self,
name_a=None,
name_b=None,
name_base=None,
start_marker=b'<<<<<<<',
mid_marker=b'=======',
end_marker=b'>>>>>>>',
base_marker=None,
localorother=None,
minimize=False,
):
"""Return merge in cvs-like form."""
self.conflicts = False
newline = b'\n'
if len(self.a) > 0:
if self.a[0].endswith(b'\r\n'):
newline = b'\r\n'
elif self.a[0].endswith(b'\r'):
newline = b'\r'
if name_a and start_marker:
start_marker = start_marker + b' ' + name_a
if name_b and end_marker:
end_marker = end_marker + b' ' + name_b
if name_base and base_marker:
base_marker = base_marker + b' ' + name_base
merge_regions = self.merge_regions()
if minimize:
merge_regions = self.minimize(merge_regions)
for t in merge_regions:
what = t[0]
if what == b'unchanged':
for i in range(t[1], t[2]):
yield self.base[i]
elif what == b'a' or what == b'same':
for i in range(t[1], t[2]):
yield self.a[i]
elif what == b'b':
for i in range(t[1], t[2]):
yield self.b[i]
elif what == b'conflict':
if localorother == b'local':
for i in range(t[3], t[4]):
yield self.a[i]
elif localorother == b'other':
for i in range(t[5], t[6]):
yield self.b[i]
else:
self.conflicts = True
if start_marker is not None:
yield start_marker + newline
for i in range(t[3], t[4]):
yield self.a[i]
if base_marker is not None:
yield base_marker + newline
for i in range(t[1], t[2]):
yield self.base[i]
if mid_marker is not None:
yield mid_marker + newline
for i in range(t[5], t[6]):
yield self.b[i]
if end_marker is not None:
yield end_marker + newline
else:
raise ValueError(what)
def merge_groups(self):
"""Yield sequence of line groups. Each one is a tuple:
'unchanged', lines
Lines unchanged from base
'a', lines
Lines taken from a
'same', lines
Lines taken from a (and equal to b)
'b', lines
Lines taken from b
'conflict', base_lines, a_lines, b_lines
Lines from base were changed to either a or b and conflict.
"""
for t in self.merge_regions():
what = t[0]
if what == b'unchanged':
yield what, self.base[t[1] : t[2]]
elif what == b'a' or what == b'same':
yield what, self.a[t[1] : t[2]]
elif what == b'b':
yield what, self.b[t[1] : t[2]]
elif what == b'conflict':
yield (
what,
self.base[t[1] : t[2]],
self.a[t[3] : t[4]],
self.b[t[5] : t[6]],
)
else:
raise ValueError(what)
def merge_regions(self):
"""Return sequences of matching and conflicting regions.
This returns tuples, where the first value says what kind we
have:
'unchanged', start, end
Take a region of base[start:end]
'same', astart, aend
b and a are different from base but give the same result
'a', start, end
Non-clashing insertion from a[start:end]
'conflict', zstart, zend, astart, aend, bstart, bend
Conflict between a and b, with z as common ancestor
Method is as follows:
The two sequences align only on regions which match the base
and both descendants. These are found by doing a two-way diff
of each one against the base, and then finding the
intersections between those regions. These "sync regions"
are by definition unchanged in both and easily dealt with.
The regions in between can be in any of three cases:
conflicted, or changed on only one side.
"""
# section a[0:ia] has been disposed of, etc
iz = ia = ib = 0
for region in self.find_sync_regions():
zmatch, zend, amatch, aend, bmatch, bend = region
# print 'match base [%d:%d]' % (zmatch, zend)
matchlen = zend - zmatch
assert matchlen >= 0
assert matchlen == (aend - amatch)
assert matchlen == (bend - bmatch)
len_a = amatch - ia
len_b = bmatch - ib
len_base = zmatch - iz
assert len_a >= 0
assert len_b >= 0
assert len_base >= 0
# print 'unmatched a=%d, b=%d' % (len_a, len_b)
if len_a or len_b:
# try to avoid actually slicing the lists
equal_a = compare_range(
self.a, ia, amatch, self.base, iz, zmatch
)
equal_b = compare_range(
self.b, ib, bmatch, self.base, iz, zmatch
)
same = compare_range(self.a, ia, amatch, self.b, ib, bmatch)
if same:
yield b'same', ia, amatch
elif equal_a and not equal_b:
yield b'b', ib, bmatch
elif equal_b and not equal_a:
yield b'a', ia, amatch
elif not equal_a and not equal_b:
yield b'conflict', iz, zmatch, ia, amatch, ib, bmatch
else:
raise AssertionError(b"can't handle a=b=base but unmatched")
ia = amatch
ib = bmatch
iz = zmatch
# if the same part of the base was deleted on both sides
# that's OK, we can just skip it.
if matchlen > 0:
assert ia == amatch
assert ib == bmatch
assert iz == zmatch
yield b'unchanged', zmatch, zend
iz = zend
ia = aend
ib = bend
def minimize(self, merge_regions):
"""Trim conflict regions of lines where A and B sides match.
Lines where both A and B have made the same changes at the beginning
or the end of each merge region are eliminated from the conflict
region and are instead considered the same.
"""
for region in merge_regions:
if region[0] != b"conflict":
yield region
continue
# pytype thinks this tuple contains only 3 things, but
# that's clearly not true because this code successfully
# executes. It might be wise to rework merge_regions to be
# some kind of attrs type.
(
issue,
z1,
z2,
a1,
a2,
b1,
b2,
) = region # pytype: disable=bad-unpacking
alen = a2 - a1
blen = b2 - b1
# find matches at the front
ii = 0
while (
ii < alen and ii < blen and self.a[a1 + ii] == self.b[b1 + ii]
):
ii += 1
startmatches = ii
# find matches at the end
ii = 0
while (
ii < alen
and ii < blen
and self.a[a2 - ii - 1] == self.b[b2 - ii - 1]
):
ii += 1
endmatches = ii
if startmatches > 0:
yield b'same', a1, a1 + startmatches
yield (
b'conflict',
z1,
z2,
a1 + startmatches,
a2 - endmatches,
b1 + startmatches,
b2 - endmatches,
)
if endmatches > 0:
yield b'same', a2 - endmatches, a2
def find_sync_regions(self):
"""Return a list of sync regions, where both descendants match the base.
Generates a list of (base1, base2, a1, a2, b1, b2). There is
always a zero-length sync region at the end of all the files.
"""
ia = ib = 0
amatches = mdiff.get_matching_blocks(self.basetext, self.atext)
bmatches = mdiff.get_matching_blocks(self.basetext, self.btext)
len_a = len(amatches)
len_b = len(bmatches)
sl = []
while ia < len_a and ib < len_b:
abase, amatch, alen = amatches[ia]
bbase, bmatch, blen = bmatches[ib]
# there is an unconflicted block at i; how long does it
# extend? until whichever one ends earlier.
i = intersect((abase, abase + alen), (bbase, bbase + blen))
if i:
intbase = i[0]
intend = i[1]
intlen = intend - intbase
# found a match of base[i[0], i[1]]; this may be less than
# the region that matches in either one
assert intlen <= alen
assert intlen <= blen
assert abase <= intbase
assert bbase <= intbase
asub = amatch + (intbase - abase)
bsub = bmatch + (intbase - bbase)
aend = asub + intlen
bend = bsub + intlen
assert self.base[intbase:intend] == self.a[asub:aend], (
self.base[intbase:intend],
self.a[asub:aend],
)
assert self.base[intbase:intend] == self.b[bsub:bend]
sl.append((intbase, intend, asub, aend, bsub, bend))
# advance whichever one ends first in the base text
if (abase + alen) < (bbase + blen):
ia += 1
else:
ib += 1
intbase = len(self.base)
abase = len(self.a)
bbase = len(self.b)
sl.append((intbase, intbase, abase, abase, bbase, bbase))
return sl
def _verifytext(text, path, ui, opts):
"""verifies that text is non-binary (unless opts[text] is passed,
then we just warn)"""
if stringutil.binary(text):
msg = _(b"%s looks like a binary file.") % path
if not opts.get('quiet'):
ui.warn(_(b'warning: %s\n') % msg)
if not opts.get('text'):
raise error.Abort(msg)
return text
def _picklabels(defaults, overrides):
if len(overrides) > 3:
raise error.Abort(_(b"can only specify three labels."))
result = defaults[:]
for i, override in enumerate(overrides):
result[i] = override
return result
def is_not_null(ctx):
if not util.safehasattr(ctx, "node"):
return False
return ctx.rev() != nullrev
def _mergediff(m3, name_a, name_b, name_base):
lines = []
conflicts = False
for group in m3.merge_groups():
if group[0] == b'conflict':
base_lines, a_lines, b_lines = group[1:]
base_text = b''.join(base_lines)
b_blocks = list(
mdiff.allblocks(
base_text,
b''.join(b_lines),
lines1=base_lines,
lines2=b_lines,
)
)
a_blocks = list(
mdiff.allblocks(
base_text,
b''.join(a_lines),
lines1=base_lines,
lines2=b_lines,
)
)
def matching_lines(blocks):
return sum(
block[1] - block[0]
for block, kind in blocks
if kind == b'='
)
def diff_lines(blocks, lines1, lines2):
for block, kind in blocks:
if kind == b'=':
for line in lines1[block[0] : block[1]]:
yield b' ' + line
else:
for line in lines1[block[0] : block[1]]:
yield b'-' + line
for line in lines2[block[2] : block[3]]:
yield b'+' + line
lines.append(b"<<<<<<<\n")
if matching_lines(a_blocks) < matching_lines(b_blocks):
lines.append(b"======= %s\n" % name_a)
lines.extend(a_lines)
lines.append(b"------- %s\n" % name_base)
lines.append(b"+++++++ %s\n" % name_b)
lines.extend(diff_lines(b_blocks, base_lines, b_lines))
else:
lines.append(b"------- %s\n" % name_base)
lines.append(b"+++++++ %s\n" % name_a)
lines.extend(diff_lines(a_blocks, base_lines, a_lines))
lines.append(b"======= %s\n" % name_b)
lines.extend(b_lines)
lines.append(b">>>>>>>\n")
conflicts = True
else:
lines.extend(group[1])
return lines, conflicts
def simplemerge(ui, localctx, basectx, otherctx, **opts):
"""Performs the simplemerge algorithm.
The merged result is written into `localctx`.
"""
def readctx(ctx):
# Merges were always run in the working copy before, which means
# they used decoded data, if the user defined any repository
# filters.
#
# Maintain that behavior today for BC, though perhaps in the future
# it'd be worth considering whether merging encoded data (what the
# repository usually sees) might be more useful.
return _verifytext(ctx.decodeddata(), ctx.path(), ui, opts)
mode = opts.get('mode', b'merge')
name_a, name_b, name_base = None, None, None
if mode != b'union':
name_a, name_b, name_base = _picklabels(
[localctx.path(), otherctx.path(), None], opts.get('label', [])
)
try:
localtext = readctx(localctx)
basetext = readctx(basectx)
othertext = readctx(otherctx)
except error.Abort:
return 1
m3 = Merge3Text(basetext, localtext, othertext)
extrakwargs = {
b"localorother": opts.get("localorother", None),
b'minimize': True,
}
if mode == b'union':
extrakwargs[b'start_marker'] = None
extrakwargs[b'mid_marker'] = None
extrakwargs[b'end_marker'] = None
elif name_base is not None:
extrakwargs[b'base_marker'] = b'|||||||'
extrakwargs[b'name_base'] = name_base
extrakwargs[b'minimize'] = False
if mode == b'mergediff':
lines, conflicts = _mergediff(m3, name_a, name_b, name_base)
else:
lines = list(
m3.merge_lines(
name_a=name_a, name_b=name_b, **pycompat.strkwargs(extrakwargs)
)
)
conflicts = m3.conflicts
# merge flags if necessary
flags = localctx.flags()
localflags = set(pycompat.iterbytestr(flags))
otherflags = set(pycompat.iterbytestr(otherctx.flags()))
if is_not_null(basectx) and localflags != otherflags:
baseflags = set(pycompat.iterbytestr(basectx.flags()))
commonflags = localflags & otherflags
addedflags = (localflags ^ otherflags) - baseflags
flags = b''.join(sorted(commonflags | addedflags))
mergedtext = b''.join(lines)
if opts.get('print'):
ui.fout.write(mergedtext)
else:
localctx.write(mergedtext, flags)
if conflicts and not mode == b'union':
return 1