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
# mdiff.py - diff and patch routines for mercurial
#
# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
#
# 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
import re
import struct
import zlib
from .i18n import _
from .pycompat import (
getattr,
setattr,
)
from . import (
encoding,
error,
policy,
pycompat,
util,
)
from .utils import dateutil
_missing_newline_marker = b"\\ No newline at end of file\n"
bdiff = policy.importmod(r'bdiff')
mpatch = policy.importmod(r'mpatch')
blocks = bdiff.blocks
fixws = bdiff.fixws
patches = mpatch.patches
patchedsize = mpatch.patchedsize
textdiff = bdiff.bdiff
splitnewlines = bdiff.splitnewlines
class diffopts(object):
'''context is the number of context lines
text treats all files as text
showfunc enables diff -p output
git enables the git extended patch format
nodates removes dates from diff headers
nobinary ignores binary files
noprefix disables the 'a/' and 'b/' prefixes (ignored in plain mode)
ignorews ignores all whitespace changes in the diff
ignorewsamount ignores changes in the amount of whitespace
ignoreblanklines ignores changes whose lines are all blank
upgrade generates git diffs to avoid data loss
'''
defaults = {
b'context': 3,
b'text': False,
b'showfunc': False,
b'git': False,
b'nodates': False,
b'nobinary': False,
b'noprefix': False,
b'index': 0,
b'ignorews': False,
b'ignorewsamount': False,
b'ignorewseol': False,
b'ignoreblanklines': False,
b'upgrade': False,
b'showsimilarity': False,
b'worddiff': False,
b'xdiff': False,
}
def __init__(self, **opts):
opts = pycompat.byteskwargs(opts)
for k in self.defaults.keys():
v = opts.get(k)
if v is None:
v = self.defaults[k]
setattr(self, k, v)
try:
self.context = int(self.context)
except ValueError:
raise error.Abort(
_(b'diff context lines count must be an integer, not %r')
% pycompat.bytestr(self.context)
)
def copy(self, **kwargs):
opts = dict((k, getattr(self, k)) for k in self.defaults)
opts = pycompat.strkwargs(opts)
opts.update(kwargs)
return diffopts(**opts)
defaultopts = diffopts()
def wsclean(opts, text, blank=True):
if opts.ignorews:
text = bdiff.fixws(text, 1)
elif opts.ignorewsamount:
text = bdiff.fixws(text, 0)
if blank and opts.ignoreblanklines:
text = re.sub(b'\n+', b'\n', text).strip(b'\n')
if opts.ignorewseol:
text = re.sub(br'[ \t\r\f]+\n', br'\n', text)
return text
def splitblock(base1, lines1, base2, lines2, opts):
# The input lines matches except for interwoven blank lines. We
# transform it into a sequence of matching blocks and blank blocks.
lines1 = [(wsclean(opts, l) and 1 or 0) for l in lines1]
lines2 = [(wsclean(opts, l) and 1 or 0) for l in lines2]
s1, e1 = 0, len(lines1)
s2, e2 = 0, len(lines2)
while s1 < e1 or s2 < e2:
i1, i2, btype = s1, s2, b'='
if i1 >= e1 or lines1[i1] == 0 or i2 >= e2 or lines2[i2] == 0:
# Consume the block of blank lines
btype = b'~'
while i1 < e1 and lines1[i1] == 0:
i1 += 1
while i2 < e2 and lines2[i2] == 0:
i2 += 1
else:
# Consume the matching lines
while i1 < e1 and lines1[i1] == 1 and lines2[i2] == 1:
i1 += 1
i2 += 1
yield [base1 + s1, base1 + i1, base2 + s2, base2 + i2], btype
s1 = i1
s2 = i2
def hunkinrange(hunk, linerange):
"""Return True if `hunk` defined as (start, length) is in `linerange`
defined as (lowerbound, upperbound).
>>> hunkinrange((5, 10), (2, 7))
True
>>> hunkinrange((5, 10), (6, 12))
True
>>> hunkinrange((5, 10), (13, 17))
True
>>> hunkinrange((5, 10), (3, 17))
True
>>> hunkinrange((5, 10), (1, 3))
False
>>> hunkinrange((5, 10), (18, 20))
False
>>> hunkinrange((5, 10), (1, 5))
False
>>> hunkinrange((5, 10), (15, 27))
False
"""
start, length = hunk
lowerbound, upperbound = linerange
return lowerbound < start + length and start < upperbound
def blocksinrange(blocks, rangeb):
"""filter `blocks` like (a1, a2, b1, b2) from items outside line range
`rangeb` from ``(b1, b2)`` point of view.
Return `filteredblocks, rangea` where:
* `filteredblocks` is list of ``block = (a1, a2, b1, b2), stype`` items of
`blocks` that are inside `rangeb` from ``(b1, b2)`` point of view; a
block ``(b1, b2)`` being inside `rangeb` if
``rangeb[0] < b2 and b1 < rangeb[1]``;
* `rangea` is the line range w.r.t. to ``(a1, a2)`` parts of `blocks`.
"""
lbb, ubb = rangeb
lba, uba = None, None
filteredblocks = []
for block in blocks:
(a1, a2, b1, b2), stype = block
if lbb >= b1 and ubb <= b2 and stype == b'=':
# rangeb is within a single "=" hunk, restrict back linerange1
# by offsetting rangeb
lba = lbb - b1 + a1
uba = ubb - b1 + a1
else:
if b1 <= lbb < b2:
if stype == b'=':
lba = a2 - (b2 - lbb)
else:
lba = a1
if b1 < ubb <= b2:
if stype == b'=':
uba = a1 + (ubb - b1)
else:
uba = a2
if hunkinrange((b1, (b2 - b1)), rangeb):
filteredblocks.append(block)
if lba is None or uba is None or uba < lba:
raise error.Abort(_(b'line range exceeds file size'))
return filteredblocks, (lba, uba)
def chooseblocksfunc(opts=None):
if (
opts is None
or not opts.xdiff
or not util.safehasattr(bdiff, b'xdiffblocks')
):
return bdiff.blocks
else:
return bdiff.xdiffblocks
def allblocks(text1, text2, opts=None, lines1=None, lines2=None):
"""Return (block, type) tuples, where block is an mdiff.blocks
line entry. type is '=' for blocks matching exactly one another
(bdiff blocks), '!' for non-matching blocks and '~' for blocks
matching only after having filtered blank lines.
line1 and line2 are text1 and text2 split with splitnewlines() if
they are already available.
"""
if opts is None:
opts = defaultopts
if opts.ignorews or opts.ignorewsamount or opts.ignorewseol:
text1 = wsclean(opts, text1, False)
text2 = wsclean(opts, text2, False)
diff = chooseblocksfunc(opts)(text1, text2)
for i, s1 in enumerate(diff):
# The first match is special.
# we've either found a match starting at line 0 or a match later
# in the file. If it starts later, old and new below will both be
# empty and we'll continue to the next match.
if i > 0:
s = diff[i - 1]
else:
s = [0, 0, 0, 0]
s = [s[1], s1[0], s[3], s1[2]]
# bdiff sometimes gives huge matches past eof, this check eats them,
# and deals with the special first match case described above
if s[0] != s[1] or s[2] != s[3]:
type = b'!'
if opts.ignoreblanklines:
if lines1 is None:
lines1 = splitnewlines(text1)
if lines2 is None:
lines2 = splitnewlines(text2)
old = wsclean(opts, b"".join(lines1[s[0] : s[1]]))
new = wsclean(opts, b"".join(lines2[s[2] : s[3]]))
if old == new:
type = b'~'
yield s, type
yield s1, b'='
def unidiff(a, ad, b, bd, fn1, fn2, binary, opts=defaultopts):
"""Return a unified diff as a (headers, hunks) tuple.
If the diff is not null, `headers` is a list with unified diff header
lines "--- <original>" and "+++ <new>" and `hunks` is a generator yielding
(hunkrange, hunklines) coming from _unidiff().
Otherwise, `headers` and `hunks` are empty.
Set binary=True if either a or b should be taken as a binary file.
"""
def datetag(date, fn=None):
if not opts.git and not opts.nodates:
return b'\t%s' % date
if fn and b' ' in fn:
return b'\t'
return b''
sentinel = [], ()
if not a and not b:
return sentinel
if opts.noprefix:
aprefix = bprefix = b''
else:
aprefix = b'a/'
bprefix = b'b/'
epoch = dateutil.datestr((0, 0))
fn1 = util.pconvert(fn1)
fn2 = util.pconvert(fn2)
if binary:
if a and b and len(a) == len(b) and a == b:
return sentinel
headerlines = []
hunks = ((None, [b'Binary file %s has changed\n' % fn1]),)
elif not a:
without_newline = not b.endswith(b'\n')
b = splitnewlines(b)
if a is None:
l1 = b'--- /dev/null%s' % datetag(epoch)
else:
l1 = b"--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1))
l2 = b"+++ %s%s" % (bprefix + fn2, datetag(bd, fn2))
headerlines = [l1, l2]
size = len(b)
hunkrange = (0, 0, 1, size)
hunklines = [b"@@ -0,0 +1,%d @@\n" % size] + [b"+" + e for e in b]
if without_newline:
hunklines[-1] += b'\n'
hunklines.append(_missing_newline_marker)
hunks = ((hunkrange, hunklines),)
elif not b:
without_newline = not a.endswith(b'\n')
a = splitnewlines(a)
l1 = b"--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1))
if b is None:
l2 = b'+++ /dev/null%s' % datetag(epoch)
else:
l2 = b"+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2))
headerlines = [l1, l2]
size = len(a)
hunkrange = (1, size, 0, 0)
hunklines = [b"@@ -1,%d +0,0 @@\n" % size] + [b"-" + e for e in a]
if without_newline:
hunklines[-1] += b'\n'
hunklines.append(_missing_newline_marker)
hunks = ((hunkrange, hunklines),)
else:
hunks = _unidiff(a, b, opts=opts)
if not next(hunks):
return sentinel
headerlines = [
b"--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)),
b"+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)),
]
return headerlines, hunks
def _unidiff(t1, t2, opts=defaultopts):
"""Yield hunks of a headerless unified diff from t1 and t2 texts.
Each hunk consists of a (hunkrange, hunklines) tuple where `hunkrange` is a
tuple (s1, l1, s2, l2) representing the range information of the hunk to
form the '@@ -s1,l1 +s2,l2 @@' header and `hunklines` is a list of lines
of the hunk combining said header followed by line additions and
deletions.
The hunks are prefixed with a bool.
"""
l1 = splitnewlines(t1)
l2 = splitnewlines(t2)
def contextend(l, len):
ret = l + opts.context
if ret > len:
ret = len
return ret
def contextstart(l):
ret = l - opts.context
if ret < 0:
return 0
return ret
lastfunc = [0, b'']
def yieldhunk(hunk):
(astart, a2, bstart, b2, delta) = hunk
aend = contextend(a2, len(l1))
alen = aend - astart
blen = b2 - bstart + aend - a2
func = b""
if opts.showfunc:
lastpos, func = lastfunc
# walk backwards from the start of the context up to the start of
# the previous hunk context until we find a line starting with an
# alphanumeric char.
for i in pycompat.xrange(astart - 1, lastpos - 1, -1):
if l1[i][0:1].isalnum():
func = b' ' + l1[i].rstrip()
# split long function name if ASCII. otherwise we have no
# idea where the multi-byte boundary is, so just leave it.
if encoding.isasciistr(func):
func = func[:41]
lastfunc[1] = func
break
# by recording this hunk's starting point as the next place to
# start looking for function lines, we avoid reading any line in
# the file more than once.
lastfunc[0] = astart
# zero-length hunk ranges report their start line as one less
if alen:
astart += 1
if blen:
bstart += 1
hunkrange = astart, alen, bstart, blen
hunklines = (
[b"@@ -%d,%d +%d,%d @@%s\n" % (hunkrange + (func,))]
+ delta
+ [b' ' + l1[x] for x in pycompat.xrange(a2, aend)]
)
# If either file ends without a newline and the last line of
# that file is part of a hunk, a marker is printed. If the
# last line of both files is identical and neither ends in
# a newline, print only one marker. That's the only case in
# which the hunk can end in a shared line without a newline.
skip = False
if not t1.endswith(b'\n') and astart + alen == len(l1) + 1:
for i in pycompat.xrange(len(hunklines) - 1, -1, -1):
if hunklines[i].startswith((b'-', b' ')):
if hunklines[i].startswith(b' '):
skip = True
hunklines[i] += b'\n'
hunklines.insert(i + 1, _missing_newline_marker)
break
if not skip and not t2.endswith(b'\n') and bstart + blen == len(l2) + 1:
for i in pycompat.xrange(len(hunklines) - 1, -1, -1):
if hunklines[i].startswith(b'+'):
hunklines[i] += b'\n'
hunklines.insert(i + 1, _missing_newline_marker)
break
yield hunkrange, hunklines
# bdiff.blocks gives us the matching sequences in the files. The loop
# below finds the spaces between those matching sequences and translates
# them into diff output.
#
hunk = None
ignoredlines = 0
has_hunks = False
for s, stype in allblocks(t1, t2, opts, l1, l2):
a1, a2, b1, b2 = s
if stype != b'!':
if stype == b'~':
# The diff context lines are based on t1 content. When
# blank lines are ignored, the new lines offsets must
# be adjusted as if equivalent blocks ('~') had the
# same sizes on both sides.
ignoredlines += (b2 - b1) - (a2 - a1)
continue
delta = []
old = l1[a1:a2]
new = l2[b1:b2]
b1 -= ignoredlines
b2 -= ignoredlines
astart = contextstart(a1)
bstart = contextstart(b1)
prev = None
if hunk:
# join with the previous hunk if it falls inside the context
if astart < hunk[1] + opts.context + 1:
prev = hunk
astart = hunk[1]
bstart = hunk[3]
else:
if not has_hunks:
has_hunks = True
yield True
for x in yieldhunk(hunk):
yield x
if prev:
# we've joined the previous hunk, record the new ending points.
hunk[1] = a2
hunk[3] = b2
delta = hunk[4]
else:
# create a new hunk
hunk = [astart, a2, bstart, b2, delta]
delta[len(delta) :] = [b' ' + x for x in l1[astart:a1]]
delta[len(delta) :] = [b'-' + x for x in old]
delta[len(delta) :] = [b'+' + x for x in new]
if hunk:
if not has_hunks:
has_hunks = True
yield True
for x in yieldhunk(hunk):
yield x
elif not has_hunks:
yield False
def b85diff(to, tn):
'''print base85-encoded binary diff'''
def fmtline(line):
l = len(line)
if l <= 26:
l = pycompat.bytechr(ord(b'A') + l - 1)
else:
l = pycompat.bytechr(l - 26 + ord(b'a') - 1)
return b'%c%s\n' % (l, util.b85encode(line, True))
def chunk(text, csize=52):
l = len(text)
i = 0
while i < l:
yield text[i : i + csize]
i += csize
if to is None:
to = b''
if tn is None:
tn = b''
if to == tn:
return b''
# TODO: deltas
ret = []
ret.append(b'GIT binary patch\n')
ret.append(b'literal %d\n' % len(tn))
for l in chunk(zlib.compress(tn)):
ret.append(fmtline(l))
ret.append(b'\n')
return b''.join(ret)
def patchtext(bin):
pos = 0
t = []
while pos < len(bin):
p1, p2, l = struct.unpack(b">lll", bin[pos : pos + 12])
pos += 12
t.append(bin[pos : pos + l])
pos += l
return b"".join(t)
def patch(a, bin):
if len(a) == 0:
# skip over trivial delta header
return util.buffer(bin, 12)
return mpatch.patches(a, [bin])
# similar to difflib.SequenceMatcher.get_matching_blocks
def get_matching_blocks(a, b):
return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)]
def trivialdiffheader(length):
return struct.pack(b">lll", 0, 0, length) if length else b''
def replacediffheader(oldlen, newlen):
return struct.pack(b">lll", 0, oldlen, newlen)