author | mpm@selenic.com |
Wed, 29 Jun 2005 11:05:09 -0800 | |
changeset 519 | 50768efaf6f2 |
parent 515 | 03f27b1381f9 |
child 582 | df8a5a0098d4 |
permissions | -rw-r--r-- |
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# mdiff.py - diff and patch routines for mercurial |
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# |
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# Copyright 2005 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 difflib, struct, bdiff |
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from mpatch import * |
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def unidiff(a, ad, b, bd, fn, r=None): |
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if not a and not b: return "" |
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if a == None: |
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b = b.splitlines(1) |
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l1 = "--- %s\t%s\n" % ("/dev/null", ad) |
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l2 = "+++ %s\t%s\n" % ("b/" + fn, 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 b == None: |
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a = a.splitlines(1) |
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l1 = "--- %s\t%s\n" % ("a/" + fn, ad) |
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l2 = "+++ %s\t%s\n" % ("/dev/null", 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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a = a.splitlines(1) |
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b = b.splitlines(1) |
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l = list(difflib.unified_diff(a, b, "a/" + fn, "b/" + fn)) |
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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] = l[0][:-2] + "\t" + ad + "\n" |
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l[1] = l[1][:-2] + "\t" + bd + "\n" |
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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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def sortdiff(a, b): |
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la = lb = 0 |
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lena = len(a) |
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lenb = len(b) |
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while 1: |
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am, bm, = la, lb |
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# walk over matching lines |
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while lb < lenb and la < lena and a[la] == b[lb] : |
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la += 1 |
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lb += 1 |
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if la > am: |
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yield (am, bm, la - am) # return a match |
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# skip mismatched lines from b |
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while la < lena and lb < lenb and b[lb] < a[la]: |
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lb += 1 |
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if lb >= lenb: |
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break |
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# skip mismatched lines from a |
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while la < lena and lb < lenb and b[lb] > a[la]: |
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la += 1 |
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if la >= lena: |
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break |
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yield (lena, lenb, 0) |
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def diff(a, b, sorted=0): |
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if not a: |
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s = "".join(b) |
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return s and (struct.pack(">lll", 0, 0, len(s)) + s) |
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bin = [] |
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p = [0] |
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for i in a: p.append(p[-1] + len(i)) |
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if sorted: |
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try: |
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d = sortdiff(a, b) |
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except: |
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print a, b |
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raise |
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else: |
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d = difflib.SequenceMatcher(None, a, b).get_matching_blocks() |
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la = 0 |
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lb = 0 |
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for am, bm, size in d: |
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s = "".join(b[lb:bm]) |
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if am > la or s: |
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bin.append(struct.pack(">lll", p[la], p[am], len(s)) + s) |
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la = am + size |
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lb = bm + size |
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return "".join(bin) |
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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 patches(a, [bin]) |
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textdiff = bdiff.bdiff |
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