copies: avoid instancing more changectx to access parent revisions
We just need to know the revision numbers of the parents, creating full context
is needlessly expensive.
This provide a small, but noticeable performance boost.
revision: large amount; added files: large amount; rename small amount;
c3b14617fbd7 9ba6ab77fd29
before: ! wall 2.885636 comb 2.900000 user 2.870000 sys 0.030000 (median of 10)
after: ! wall 2.702270 comb 2.710000 user 2.690000 sys 0.020000 (median of 10)
revision: large amount; added files: small amount; rename small amount;
c3b14617fbd7 f650a9b140d2
before: ! wall 4.298271 comb 4.290000 user 4.240000 sys 0.050000 (median of 10)
after: ! wall 3.976610 comb 3.970000 user 3.920000 sys 0.050000 (median of 10)
revision: large amount; added files: large amount; rename large amount;
08ea3258278e d9fa043f30c0
before: ! wall 0.773397 comb 0.770000 user 0.770000 sys 0.000000 (median of 11)
after: ! wall 0.701634 comb 0.700000 user 0.700000 sys 0.000000 (median of 13)
revision: small amount; added files: large amount; rename large amount;
df6f7a526b60 a83dc6a2d56f
before: ! wall 0.013585 comb 0.010000 user 0.010000 sys 0.000000 (median of 217)
after: ! wall 0.013550 comb 0.010000 user 0.010000 sys 0.000000 (median of 218)
revision: small amount; added files: large amount; rename small amount;
4aa4e1f8e19a 169138063d63
before: ! wall 0.003202 comb 0.000000 user 0.000000 sys 0.000000 (median of 929)
after: ! wall 0.002993 comb 0.010000 user 0.010000 sys 0.000000 (median of 992)
revision: small amount; added files: small amount; rename small amount;
4bc173b045a6 964879152e2e
before: ! wall 0.000077 comb 0.000000 user 0.000000 sys 0.000000 (median of 12060)
after: ! wall 0.000072 comb 0.000000 user 0.000000 sys 0.000000 (median of 12804)
revision: medium amount; added files: large amount; rename medium amount;
c95f1ced15f2 2c68e87c3efe
before: ! wall 0.510614 comb 0.500000 user 0.500000 sys 0.000000 (median of 18)
after: ! wall 0.473681 comb 0.470000 user 0.470000 sys 0.000000 (median of 20)
revision: medium amount; added files: medium amount; rename small amount;
d343da0c55a8 d7746d32bf9d
before: ! wall 0.126552 comb 0.130000 user 0.130000 sys 0.000000 (median of 77)
after: ! wall 0.115240 comb 0.110000 user 0.110000 sys 0.000000 (median of 85)
Differential Revision: https://phab.mercurial-scm.org/D7122
# 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 . import (
error,
mdiff,
pycompat,
)
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
issue, z1, z2, a1, a2, b1, b2 = region
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 find_unconflicted(self):
"""Return a list of ranges in base that are not conflicted."""
am = mdiff.get_matching_blocks(self.basetext, self.atext)
bm = mdiff.get_matching_blocks(self.basetext, self.btext)
unc = []
while am and bm:
# there is an unconflicted block at i; how long does it
# extend? until whichever one ends earlier.
a1 = am[0][0]
a2 = a1 + am[0][2]
b1 = bm[0][0]
b2 = b1 + bm[0][2]
i = intersect((a1, a2), (b1, b2))
if i:
unc.append(i)
if a2 < b2:
del am[0]
else:
del bm[0]
return unc
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(b'quiet'):
ui.warn(_(b'warning: %s\n') % msg)
if not opts.get(b'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 simplemerge(ui, localctx, basectx, otherctx, **opts):
"""Performs the simplemerge algorithm.
The merged result is written into `localctx`.
"""
opts = pycompat.byteskwargs(opts)
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(b'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(b'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(b"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
mergedtext = b""
for line in m3.merge_lines(
name_a=name_a, name_b=name_b, **pycompat.strkwargs(extrakwargs)
):
if opts.get(b'print'):
ui.fout.write(line)
else:
mergedtext += line
if not opts.get(b'print'):
localctx.write(mergedtext, localctx.flags())
if m3.conflicts and not mode == b'union':
return 1