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# mdiff.py - diff and patch routines for mercurial
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#
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# Copyright 2005, 2006 Matt Mackall <mpm@selenic.com>
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#
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# This software may be used and distributed according to the terms
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# of the GNU General Public License, incorporated herein by reference.
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import bdiff, mpatch, re, struct, util, md5
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def splitnewlines(text):
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'''like str.splitlines, but only split on newlines.'''
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lines = [l + '\n' for l in text.split('\n')]
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if lines:
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if lines[-1] == '\n':
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lines.pop()
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else:
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lines[-1] = lines[-1][:-1]
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return lines
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class diffopts(object):
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'''context is the number of context lines
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text treats all files as text
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showfunc enables diff -p output
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git enables the git extended patch format
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nodates removes dates from diff headers
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ignorews ignores all whitespace changes in the diff
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ignorewsamount ignores changes in the amount of whitespace
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ignoreblanklines ignores changes whose lines are all blank'''
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defaults = {
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'context': 3,
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'text': False,
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'showfunc': True,
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'git': False,
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'nodates': False,
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'ignorews': False,
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'ignorewsamount': False,
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'ignoreblanklines': False,
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}
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__slots__ = defaults.keys()
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def __init__(self, **opts):
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for k in self.__slots__:
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v = opts.get(k)
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if v is None:
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v = self.defaults[k]
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setattr(self, k, v)
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defaultopts = diffopts()
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def unidiff(a, ad, b, bd, fn, r=None, opts=defaultopts):
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def datetag(date):
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return (opts.git or opts.nodates) and '\n' or '\t%s\n' % date
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if not a and not b: return ""
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epoch = util.datestr((0, 0))
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if not opts.text and (util.binary(a) or util.binary(b)):
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def h(v):
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# md5 is used instead of sha1 because md5 is supposedly faster
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return md5.new(v).digest()
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if a and b and len(a) == len(b) and h(a) == h(b):
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return ""
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l = ['Binary file %s has changed\n' % fn]
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elif not a:
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b = splitnewlines(b)
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if a is None:
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l1 = '--- /dev/null%s' % datetag(epoch)
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else:
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l1 = "--- %s%s" % ("a/" + fn, datetag(ad))
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l2 = "+++ %s%s" % ("b/" + fn, datetag(bd))
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l3 = "@@ -0,0 +1,%d @@\n" % len(b)
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l = [l1, l2, l3] + ["+" + e for e in b]
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elif not b:
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a = splitnewlines(a)
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l1 = "--- %s%s" % ("a/" + fn, datetag(ad))
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if b is None:
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l2 = '+++ /dev/null%s' % datetag(epoch)
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else:
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l2 = "+++ %s%s" % ("b/" + fn, datetag(bd))
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l3 = "@@ -1,%d +0,0 @@\n" % len(a)
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l = [l1, l2, l3] + ["-" + e for e in a]
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else:
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al = splitnewlines(a)
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bl = splitnewlines(b)
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l = list(bunidiff(a, b, al, bl, "a/" + fn, "b/" + fn, opts=opts))
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if not l: return ""
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# difflib uses a space, rather than a tab
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l[0] = "%s%s" % (l[0][:-2], datetag(ad))
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l[1] = "%s%s" % (l[1][:-2], datetag(bd))
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for ln in xrange(len(l)):
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if l[ln][-1] != '\n':
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l[ln] += "\n\ No newline at end of file\n"
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if r:
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l.insert(0, "diff %s %s\n" %
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(' '.join(["-r %s" % rev for rev in r]), fn))
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return "".join(l)
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# somewhat self contained replacement for difflib.unified_diff
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# t1 and t2 are the text to be diffed
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# l1 and l2 are the text broken up into lines
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# header1 and header2 are the filenames for the diff output
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def bunidiff(t1, t2, l1, l2, header1, header2, opts=defaultopts):
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def contextend(l, len):
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ret = l + opts.context
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if ret > len:
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ret = len
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return ret
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def contextstart(l):
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ret = l - opts.context
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if ret < 0:
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return 0
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return ret
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def yieldhunk(hunk, header):
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if header:
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for x in header:
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yield x
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(astart, a2, bstart, b2, delta) = hunk
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aend = contextend(a2, len(l1))
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alen = aend - astart
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blen = b2 - bstart + aend - a2
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func = ""
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if opts.showfunc:
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# walk backwards from the start of the context
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# to find a line starting with an alphanumeric char.
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for x in xrange(astart, -1, -1):
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t = l1[x].rstrip()
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if funcre.match(t):
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func = ' ' + t[:40]
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break
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yield "@@ -%d,%d +%d,%d @@%s\n" % (astart + 1, alen,
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bstart + 1, blen, func)
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for x in delta:
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yield x
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for x in xrange(a2, aend):
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yield ' ' + l1[x]
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header = [ "--- %s\t\n" % header1, "+++ %s\t\n" % header2 ]
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if opts.showfunc:
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funcre = re.compile('\w')
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if opts.ignorewsamount:
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wsamountre = re.compile('[ \t]+')
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wsappendedre = re.compile(' \n')
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if opts.ignoreblanklines:
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wsblanklinesre = re.compile('\n')
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if opts.ignorews:
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wsre = re.compile('[ \t]')
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# bdiff.blocks gives us the matching sequences in the files. The loop
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# below finds the spaces between those matching sequences and translates
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# them into diff output.
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#
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diff = bdiff.blocks(t1, t2)
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hunk = None
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for i in xrange(len(diff)):
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# The first match is special.
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# we've either found a match starting at line 0 or a match later
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# in the file. If it starts later, old and new below will both be
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# empty and we'll continue to the next match.
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if i > 0:
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s = diff[i-1]
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else:
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s = [0, 0, 0, 0]
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delta = []
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s1 = diff[i]
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a1 = s[1]
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a2 = s1[0]
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b1 = s[3]
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b2 = s1[2]
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old = l1[a1:a2]
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new = l2[b1:b2]
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# bdiff sometimes gives huge matches past eof, this check eats them,
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# and deals with the special first match case described above
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if not old and not new:
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continue
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if opts.ignoreblanklines:
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wsold = wsblanklinesre.sub('', "".join(old))
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wsnew = wsblanklinesre.sub('', "".join(new))
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if wsold == wsnew:
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continue
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if opts.ignorewsamount:
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wsold = wsamountre.sub(' ', "".join(old))
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wsold = wsappendedre.sub('\n', wsold)
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wsnew = wsamountre.sub(' ', "".join(new))
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wsnew = wsappendedre.sub('\n', wsnew)
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if wsold == wsnew:
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continue
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if opts.ignorews:
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wsold = wsre.sub('', "".join(old))
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wsnew = wsre.sub('', "".join(new))
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if wsold == wsnew:
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continue
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astart = contextstart(a1)
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bstart = contextstart(b1)
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prev = None
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if hunk:
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# join with the previous hunk if it falls inside the context
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if astart < hunk[1] + opts.context + 1:
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prev = hunk
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astart = hunk[1]
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bstart = hunk[3]
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else:
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for x in yieldhunk(hunk, header):
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yield x
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# we only want to yield the header if the files differ, and
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# we only want to yield it once.
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header = None
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if prev:
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# we've joined the previous hunk, record the new ending points.
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hunk[1] = a2
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hunk[3] = b2
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delta = hunk[4]
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else:
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# create a new hunk
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hunk = [ astart, a2, bstart, b2, delta ]
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delta[len(delta):] = [ ' ' + x for x in l1[astart:a1] ]
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delta[len(delta):] = [ '-' + x for x in old ]
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delta[len(delta):] = [ '+' + x for x in new ]
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if hunk:
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for x in yieldhunk(hunk, header):
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yield x
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def patchtext(bin):
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pos = 0
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t = []
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while pos < len(bin):
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p1, p2, l = struct.unpack(">lll", bin[pos:pos + 12])
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pos += 12
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t.append(bin[pos:pos + l])
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pos += l
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return "".join(t)
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def patch(a, bin):
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return mpatch.patches(a, [bin])
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# similar to difflib.SequenceMatcher.get_matching_blocks
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def get_matching_blocks(a, b):
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return [(d[0], d[2], d[1] - d[0]) for d in bdiff.blocks(a, b)]
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patches = mpatch.patches
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patchedsize = mpatch.patchedsize
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textdiff = bdiff.bdiff
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