_DiffEngine
class _DiffEngine (View source)
Class used internally by Diff to actually compute the diffs.
The algorithm used here is mostly lifted from the perl module Algorithm::Diff (version 1.06) by Ned Konz, which is available at: http://www.perl.com/CPAN/authors/id/N/NE/NEDKONZ/Algorithm-Diff-1.06.zip
More ideas are taken from: http://www.ics.uci.edu/~eppstein/161/960229.html
Some ideas are (and a bit of code) are from from analyze.c, from GNU diffutils-2.7, which can be found at: ftp://gnudist.gnu.org/pub/gnu/diffutils/diffutils-2.7.tar.gz
Finally, some ideas (subdivision by NCHUNKS > 2, and some optimizations) are my own.
Methods
Details
diff($from_lines, $to_lines)
No description
_diag($xoff, $xlim, $yoff, $ylim, $nchunks)
No description
_lcs_pos($ypos)
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_compareseq($xoff, $xlim, $yoff, $ylim)
No description
_shift_boundaries($lines, $changed, $other_changed)
No description