From:

Date:

November 30, 2003 08:17Subject:

New module Algorithm::Interval2PrefixMessage ID:

017901c3b75d$685b95e0$6400000a@marvinHi all, I've written a small module, encapsulating an algorithm that can generate a set of 'prefixes' (patterns that match the beginning of a numeric string) from an 'interval' (range) of integers. This is a problem often occurring working with telephony switching equipment or IP address subnetting. I've trawled CPAN to locate prior work with similar functionality, but to no avail. The POD is attatched below, and the module distfile can be fetched from http://lars.thegler.dk/perl/Algorithm-Interval2Prefix-0.01.tar.gz Question: Am I reinventing something here? Question: Is the namespace appropriate? Comments on code, style etc are welcome. /Lars --cut-- NAME Algorithm::Interval2Prefix - Generate prefixes from intervals SYNOPSIS use Algorithm::Interval2Prefix; my @prefixes = interval2prefix('33400','33599'); print join(',', @prefixes); # prints "334,335" DESCRIPTION Taking an interval as input, this module will construct the smallest set of prefixes, such that all numbers in the interval will match exactly one of the prefixes, and no prefix will match a number not in the interval. E.g. all numbers in the interval 39967000 to 39980999 would be matched by the following set of prefixes: 39967 39968 39969 3997 39980 This type of conversion is particularly useful when working with telephony switching equipment, which usually determines call routing based on number prefixes rather than ranges. The algorithm is much dependent on the number base, which defaults to 10. Other number bases can be specified explicitly. FUNCTIONS "interval2prefix()" my @p = interval2prefix($lo, $hi); or my @q = interval2prefix($lo, $hi, $base); Yields an array of prefixes, covering the interval $lo to $hi, using number base $base. $base is optional, and defaults to 10. EXPORT &interval2prefix is exported by default. BUGS Please report any bugs via CPAN RT: http://rt.cpan.org/NoAuth/Bugs.html?Dist=Algorithm-Interval2Prefix or by sending mail to bug-Algorithm-Interval2Prefix@rt.cpan.org AUTHOR Lars Thegler <lars@thegler.dk> COPYRIGHT Copyright (c) 2003 Lars Thegler. All rights reserved. This program is free software; you can redistribute it and/or modify it under the same terms as Perl itself. --cut--Thread Next

**New module Algorithm::Interval2Prefix**by Lars Thegler- RE: New module Algorithm::Interval2Prefix by Orton, Yves
- Re: New module Algorithm::Interval2Prefix by Fergal Daly
- Re: New module Algorithm::Interval2Prefix by Lars Thegler
- Re: New module Algorithm::Interval2Prefix by Fergal Daly
- Re: New module Algorithm::Interval2Prefix by Phil.Moore
- Re: New module Algorithm::Interval2Prefix by Lars Thegler

nntp.perl.org: Perl Programming lists via nntp and http.

Comments to Ask Bjørn Hansen at ask@perl.org | Group listing | About