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Man Pages


Manual Reference Pages  -  ALGORITHM::LCS (3)

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NAME

Algorithm::LCS - Fast (XS) implementation of the
Longest Common Subsequence (LCS) Algorithm

CONTENTS

SYNOPSIS



  use Algorithm::LCS;

  $alg = Algorithm::LCS->new;
  @lcs = $alg->LCS(\@a,\@b);

  $cb = $alg->callback(@b); # closure
  @lcs = $cb->(\@a);        # same result as prior LCS() call



ABSTRACT

Algorithm::LCS reimplements Algorithm::Diff’s core loop in XS, and provides a simple OO interface to it.

Extract from the Algorithm::Diff v1.15 manpage:



  The algorithm is that described in
  I<A Fast Algorithm for Computing Longest Common Subsequences>,
  CACM, vol.20, no.5, pp.350-353, May 1977, with a few
  minor improvements to improve the speed.



DESCRIPTION

    CONSTRUCTOR

new() Creates a new object which maintains internal storage areas for the LCS computation. Use one of these per concurrent LCS() call.

    METHODS

line_map(@lines) Send @lines to a hashref containing elements of the form



       value => [(increasing) list of matching indices]



callback(@lines) Generates a closure capturing the object and line_map hash for @lines. Most useful when computing multiple LCSs against a single file.
LCS(\@a,\@b) Finds a Longest Common Subsequence, taking two arrayrefs as method arguments. In scalar context the return value is the length of the subsequence. In list context it yields a list of corresponding indices, which are represented by 2-element array refs. See the Algorithm::Diff manpage for more details.

    EXPORT

None by design.

SEE ALSO

Algorithm::Diff

AUTHOR

Joe Schaefer, <joe+cpan@sunstarsys.com>

COPYRIGHT AND LICENSE

Copyright 2003 by Joe Schaefer

This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.

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perl v5.20.3 LCS (3) 2003-08-11

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