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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 of the
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# GNU General Public License version 2 or any later version.
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from i18n import _
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import bdiff, mpatch, util
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import re, struct
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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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upgrade generates git diffs to avoid data loss
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'''
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defaults = {
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'context': 3,
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'text': False,
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'showfunc': False,
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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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'upgrade': 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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try:
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self.context = int(self.context)
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except ValueError:
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raise util.Abort(_('diff context lines count must be '
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'an integer, not %r') % self.context)
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def copy(self, **kwargs):
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opts = dict((k, getattr(self, k)) for k in self.defaults)
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opts.update(kwargs)
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return diffopts(**opts)
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defaultopts = diffopts()
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def wsclean(opts, text, blank=True):
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if opts.ignorews:
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text = re.sub('[ \t\r]+', '', text)
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elif opts.ignorewsamount:
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text = re.sub('[ \t\r]+', ' ', text)
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text = text.replace(' \n', '\n')
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if blank and opts.ignoreblanklines:
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text = re.sub('\n+', '', text)
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return text
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def diffline(revs, a, b, opts):
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parts = ['diff']
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if opts.git:
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parts.append('--git')
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if revs and not opts.git:
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parts.append(' '.join(["-r %s" % rev for rev in revs]))
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if opts.git:
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parts.append('a/%s' % a)
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parts.append('b/%s' % b)
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else:
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parts.append(a)
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return ' '.join(parts) + '\n'
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def unidiff(a, ad, b, bd, fn1, fn2, r=None, opts=defaultopts):
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def datetag(date, addtab=True):
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if not opts.git and not opts.nodates:
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return '\t%s\n' % date
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if addtab and ' ' in fn1:
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return '\t\n'
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return '\n'
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if not a and not b:
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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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if a and b and len(a) == len(b) and a == b:
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return ""
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l = ['Binary file %s has changed\n' % fn1]
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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, False)
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else:
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l1 = "--- %s%s" % ("a/" + fn1, datetag(ad))
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l2 = "+++ %s%s" % ("b/" + fn2, 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/" + fn1, datetag(ad))
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if b is None:
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l2 = '+++ /dev/null%s' % datetag(epoch, False)
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else:
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l2 = "+++ %s%s" % ("b/" + fn2, 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(_unidiff(a, b, al, bl, opts=opts))
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if not l:
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return ""
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l.insert(0, "--- a/%s%s" % (fn1, datetag(ad)))
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l.insert(1, "+++ b/%s%s" % (fn2, 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, diffline(r, fn1, fn2, opts))
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return "".join(l)
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# creates a headerless 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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def _unidiff(t1, t2, l1, l2, 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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lastfunc = [0, '']
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def yieldhunk(hunk):
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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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lastpos, func = lastfunc
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# walk backwards from the start of the context up to the start of
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# the previous hunk context until we find a line starting with an
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# alphanumeric char.
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for i in xrange(astart - 1, lastpos - 1, -1):
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if l1[i][0].isalnum():
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func = ' ' + l1[i].rstrip()[:40]
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lastfunc[1] = func
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break
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# by recording this hunk's starting point as the next place to
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# start looking for function lines, we avoid reading any line in
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# the file more than once.
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lastfunc[0] = astart
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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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# 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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if opts.ignorews or opts.ignorewsamount:
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t1 = wsclean(opts, t1, False)
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t2 = wsclean(opts, t2, False)
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diff = bdiff.blocks(t1, t2)
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hunk = None
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for i, s1 in enumerate(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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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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if wsclean(opts, "".join(old)) == wsclean(opts, "".join(new)):
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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):
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yield x
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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):
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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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if len(a) == 0:
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# skip over trivial delta header
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return buffer(bin, 12)
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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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def trivialdiffheader(length):
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return struct.pack(">lll", 0, 0, length)
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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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