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- <h2>The Porter 2 stemmer</h2>
-<p>
-This is the Porter 2 stemming algorithm, as described at <a
-href="http://snowball.tartarus.org/algorithms/english/stemmer.html">snowball.tartarus.org/algorithms/english/stemmer.html</a>
-The original paper is:
-</p>
-<p>
-Porter, 1980, “An algorithm for suffix stripping”,
-<em>Program</em>, Vol. 14, no. 3, pp 130-137
-</p>
-<h2>Features of this implementation</h2>
-<p>
-This stemmer is written in pure Ruby, making it easy to modify for language
-variants. For instance, the original Porter stemmer only works for
-American English and does not recognise British English’s
-’-ise’ as an alternate spelling of ’-ize’. This
-implementation has been extended to handle correctly British English.
-</p>
-<p>
-This stemmer also features a comprehensive test set of over 29,000 words,
-taken from the <a
-href="http://snowball.tartarus.org/algorithms/english/stemmer.html">Porter
-2 stemmer website</a>.
-</p>
-<h2>Files</h2>
-<p>
-Constants for the stemmer are in the <a href="Porter2.html">Porter2</a>
-module.
-</p>
-<p>
-Procedures that implement the stemmer are added to the <a
-href="String.html">String</a> class.
-</p>
-<p>
-The stemmer algorithm is implemented in the <a
-href="String.html#method-i-porter2_stem">String#porter2_stem</a> procedure.
-</p>
-<h2>Internationalisation</h2>
-<p>
-There isn’t much, as this is a stemmer that only works for English.
-</p>
-<p>
-The <tt>gb_english</tt> flag to the various procedures allows the stemmer
-to treat the British English ’-ise’ the same as the American
-English ’-ize’.
-</p>
-<h2>Longest suffixes</h2>
-<p>
-Several places in the algorithm require matching the longest suffix of a
-word. The regexp engine in Ruby 1.9 seems to handle alterntives in regexps
-by finding the alternative that matches at the first position in the
-string. As we’re only talking about suffixes, that first match is
-also the longest suffix. If the regexp engine changes, this behaviour may
-change and break the stemmer.
-</p>
-<h2>Usage</h2>
-<p>
-Call the <a
-href="String.html#method-i-porter2_stem">String#porter2_stem</a> or <a
-href="String.html#method-i-stem">String#stem</a> methods on a string to
-return its stem
-</p>
-<pre>
- "consistency".stem # => "consist"
- "knitting".stem # => "knit"
- "articulated".stem # => "articul"
- "nationalize".stem # => "nation"
- "nationalise".stem # => "nationalis"
- "nationalise".stem(true) # => "nation"
-</pre>
-<h2>Author</h2>
-<p>
-The Porter 2 stemming algorithm was developed by <a
-href="http://snowball.tartarus.org/algorithms/english/stemmer.html">Martin
-Porter</a>. This implementation is by <a href="http://www.njae.me.uk">Neil
-Smith</a>.
-</p>
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