NAME
Text::Levenshtein::BV - Bit Vector (BV) implementation of the Levenshtein Algorithm
SYNOPSIS
use Text::Levenshtein::BV;
my $lev = Text::Levenshtein::BV->new;
my $ses = $lev->SES(\@a,\@b);ABSTRACT
Text::Levenshtein::BV implements the Levenshtein algorithm using bit vectors and is faster in most cases than the naive implementation using a match matrix.
DESCRIPTION
CONSTRUCTOR
- new()
-
Creates a new object which maintains internal storage areas for the SES computation. Use one of these per concurrent SES() call.
METHODS
- SES(\@a,\@b)
-
Finds a Shortest Edit Script (SES), taking two arrayrefs as method arguments. It returns an array reference of corresponding indices, which are represented by 2-element array refs.
- distance(\@a,\@b)
-
Calculates the edit distance, taking two arrayrefs as method arguments. It returns an integer.
- hunks2sequences(\@alignment)
-
Reformats the alignment returned by SES into an array of two sequences.
- sequence2char(\@a)
-
Renders an array of strings into a string.
- sequences2hunks(\@a,\@b)
-
Does the reverse of method hunks2sequences.
- hunks2char(\@a,\@b,\@alignment)
-
Returns hunks of aligned characters.
- hunks2distance(\@a,\@b,\@alignment)
-
Calculates the distance from alignment.
EXPORT
None by design.
STABILITY
Until release of version 1.00 the included methods, names of methods and their interfaces are subject to change.
Beginning with version 1.00 the specification will be stable, i.e. not changed between major versions.
REFERENCES
[Hyy03] Hyyrö, Heikki. (2003). A Bit-Vector Algorithm for Computing Levenshtein and Damerau Edit Distances. In Nord. J. Comput. 10. 29-39.
[Hyy04a] Hyyrö, Heikki. (2004). A Note on Bit-Parallel Alignment Computation. In M. Simanek and J. Holub, editors, Stringology, pages 79-87. Department of Computer Science and Engineering, Faculty of Electrical Engineering, Czech Technical University, 2004.
[Hyy04b] Hyyrö, Heikki. (2004). Bit-parallel LCS-length computation revisited. In Proc. 15th Australasian Workshop on Combinatorial Algorithms (AWOCA 2004), 2004.
[HN02] Hyyrö, Heikki and Navarro, Gonzalo. Faster bit-parallel approximate string matching. In Proc. 13th Combinatorial Pattern Matching (CPM 2002), LNCS 2373, pages 203–224, 2002.
[Myers99] Myers, Gene. A fast bit-vector algorithm for approximate string matching based on dynamic progamming. Journal of the ACM, 46(3):395–415, 1999.
SEE ALSO
SOURCE REPOSITORY
http://github.com/wollmers/Text-Levenshtein-BV
AUTHOR
Helmut Wollmersdorfer <helmut@wollmersdorfer.at>
COPYRIGHT AND LICENSE
Copyright 2016-2022 by Helmut Wollmersdorfer
This library is free software; you can redistribute it and/or modify it under the same terms as Perl itself.