Mercurial > hg
view mercurial/mdiff.py @ 29733:bb04f96df51c
wireproto: consolidate code for obtaining "cmds" argument value
Both wireproto.py and sshpeer.py had code for producing the value to
the "cmds" argument used by the "batch" command. This patch extracts
that code to a standalone function and uses it.
author | Gregory Szorc <gregory.szorc@gmail.com> |
---|---|
date | Sat, 06 Aug 2016 13:46:28 -0700 |
parents | 30789efb1e5e |
children | ff17dff99295 |
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# 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 . import ( base85, bdiff, error, mpatch, util, ) def splitnewlines(text): '''like str.splitlines, but only split on newlines.''' lines = [l + '\n' for l in text.split('\n')] if lines: if lines[-1] == '\n': lines.pop() else: lines[-1] = lines[-1][:-1] return lines 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 = { 'context': 3, 'text': False, 'showfunc': False, 'git': False, 'nodates': False, 'nobinary': False, 'noprefix': False, 'ignorews': False, 'ignorewsamount': False, 'ignoreblanklines': False, 'upgrade': False, } def __init__(self, **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(_('diff context lines count must be ' 'an integer, not %r') % self.context) def copy(self, **kwargs): opts = dict((k, getattr(self, k)) for k in self.defaults) 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('\n+', '\n', text).strip('\n') 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, '=' if (i1 >= e1 or lines1[i1] == 0 or i2 >= e2 or lines2[i2] == 0): # Consume the block of blank lines btype = '~' 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 allblocks(text1, text2, opts=None, lines1=None, lines2=None, refine=False): """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. If refine is True, then '~' blocks are refined and are only made of 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: text1 = wsclean(opts, text1, False) text2 = wsclean(opts, text2, False) diff = bdiff.blocks(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 = '!' if opts.ignoreblanklines: if lines1 is None: lines1 = splitnewlines(text1) if lines2 is None: lines2 = splitnewlines(text2) old = wsclean(opts, "".join(lines1[s[0]:s[1]])) new = wsclean(opts, "".join(lines2[s[2]:s[3]])) if old == new: type = '~' yield s, type yield s1, '=' def unidiff(a, ad, b, bd, fn1, fn2, opts=defaultopts): def datetag(date, fn=None): if not opts.git and not opts.nodates: return '\t%s\n' % date if fn and ' ' in fn: return '\t\n' return '\n' if not a and not b: return "" if opts.noprefix: aprefix = bprefix = '' else: aprefix = 'a/' bprefix = 'b/' epoch = util.datestr((0, 0)) fn1 = util.pconvert(fn1) fn2 = util.pconvert(fn2) if not opts.text and (util.binary(a) or util.binary(b)): if a and b and len(a) == len(b) and a == b: return "" l = ['Binary file %s has changed\n' % fn1] elif not a: b = splitnewlines(b) if a is None: l1 = '--- /dev/null%s' % datetag(epoch) else: l1 = "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) l2 = "+++ %s%s" % (bprefix + fn2, datetag(bd, fn2)) l3 = "@@ -0,0 +1,%d @@\n" % len(b) l = [l1, l2, l3] + ["+" + e for e in b] elif not b: a = splitnewlines(a) l1 = "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1)) if b is None: l2 = '+++ /dev/null%s' % datetag(epoch) else: l2 = "+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2)) l3 = "@@ -1,%d +0,0 @@\n" % len(a) l = [l1, l2, l3] + ["-" + e for e in a] else: al = splitnewlines(a) bl = splitnewlines(b) l = list(_unidiff(a, b, al, bl, opts=opts)) if not l: return "" l.insert(0, "--- %s%s%s" % (aprefix, fn1, datetag(ad, fn1))) l.insert(1, "+++ %s%s%s" % (bprefix, fn2, datetag(bd, fn2))) for ln in xrange(len(l)): if l[ln][-1] != '\n': l[ln] += "\n\ No newline at end of file\n" return "".join(l) # creates a headerless unified diff # t1 and t2 are the text to be diffed # l1 and l2 are the text broken up into lines def _unidiff(t1, t2, l1, l2, opts=defaultopts): 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, ''] def yieldhunk(hunk): (astart, a2, bstart, b2, delta) = hunk aend = contextend(a2, len(l1)) alen = aend - astart blen = b2 - bstart + aend - a2 func = "" 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 xrange(astart - 1, lastpos - 1, -1): if l1[i][0].isalnum(): func = ' ' + l1[i].rstrip()[:40] 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 yield "@@ -%d,%d +%d,%d @@%s\n" % (astart, alen, bstart, blen, func) for x in delta: yield x for x in xrange(a2, aend): yield ' ' + l1[x] # 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 for s, stype in allblocks(t1, t2, opts, l1, l2): a1, a2, b1, b2 = s if stype != '!': if stype == '~': # 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: 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):] = [' ' + x for x in l1[astart:a1]] delta[len(delta):] = ['-' + x for x in old] delta[len(delta):] = ['+' + x for x in new] if hunk: for x in yieldhunk(hunk): yield x def b85diff(to, tn): '''print base85-encoded binary diff''' def fmtline(line): l = len(line) if l <= 26: l = chr(ord('A') + l - 1) else: l = chr(l - 26 + ord('a') - 1) return '%c%s\n' % (l, base85.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 = '' if tn is None: tn = '' if to == tn: return '' # TODO: deltas ret = [] ret.append('GIT binary patch\n') ret.append('literal %s\n' % len(tn)) for l in chunk(zlib.compress(tn)): ret.append(fmtline(l)) ret.append('\n') return ''.join(ret) def patchtext(bin): pos = 0 t = [] while pos < len(bin): p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12]) pos += 12 t.append(bin[pos:pos + l]) pos += l return "".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(">lll", 0, 0, length) if length else '' def replacediffheader(oldlen, newlen): return struct.pack(">lll", 0, oldlen, newlen) patches = mpatch.patches patchedsize = mpatch.patchedsize textdiff = bdiff.bdiff