Text::English - Porter's stemming algorithm
use Text::English; @stems = Text::English::stem( @words );
This routine applies the Porter Stemming Algorithm to its parameters, returning the stemmed words. It is derived from the C program "stemmer.c" as found in freewais and elsewhere, which contains these notes:
Purpose: Implementation of the Porter stemming algorithm documented in: Porter, M.F., "An Algorithm For Suffix Stripping," Program 14 (3), July 1980, pp. 130-137. Provenance: Written by B. Frakes and C. Cox, 1986.
I have re-interpreted areas that use Frakes and Cox's "WordSize" function. My version may misbehave on short words starting with "y", but I can't think of any examples.
The step numbers correspond to Frakes and Cox, and are probably in Porter's article (which I've not seen). Porter's algorithm still has rough spots (e.g current/currency, -ings words), which I've not attempted to cure, although I have added support for the British -ise suffix.
This is version 0.1. I would welcome feedback, especially improvements to the punctuation-stripping step.
Ian Phillipps <email@example.com>
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