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<?php
class Lingua_Stem_Ru
{
var $VERSION = "0.02";
var $Stem_Caching = 0;
var $Stem_Cache = array();
var $VOWEL = '/аеиоуыэюя/';
var $PERFECTIVEGROUND = '/((ив|ивши|ившись|ыв|ывши|ывшись)|((?<=[ая])(в|вши|вшись)))$/';
var $REFLEXIVE = '/(с[яь])$/';
var $ADJECTIVE = '/(ее|ие|ые|ое|ими|ыми|ей|ий|ый|ой|ем|им|ым|ом|его|ого|еых|ую|юю|ая|яя|ою|ею)$/';
var $PARTICIPLE = '/((ивш|ывш|ующ)|((?<=[ая])(ем|нн|вш|ющ|щ)))$/';
var $VERB = '/((ила|ыла|ена|ейте|уйте|ите|или|ыли|ей|уй|ил|ыл|им|ым|ены|ить|ыть|ишь|ую|ю)|((?<=[ая])(ла|на|ете|йте|ли|й|л|ем|н|ло|но|ет|ют|ны|ть|ешь|нно)))$/';
var $NOUN = '/(а|ев|ов|ие|ье|е|иями|ями|ами|еи|ии|и|ией|ей|ой|ий|й|и|ы|ь|ию|ью|ю|ия|ья|я)$/';
var $RVRE = '/^(.*?[аеиоуыэюя])(.*)$/';
var $DERIVATIONAL = '/[^аеиоуыэюя][аеиоуыэюя]+[^аеиоуыэюя]+[аеиоуыэюя].*(?<=о)сть?$/';
function s(&$s, $re, $to)
{
$orig = $s;
$s = preg_replace($re, $to, $s);
return $orig !== $s;
}
function m($s, $re)
{
return preg_match($re, $s);
}
function stem_word($word)
{
$word = strtolower($word);
$word = strtr($word, array('ё'=>'е'));
# Check against cache of stemmed words
if ($this->Stem_Caching && isset($this->Stem_Cache[$word])) {
return $this->Stem_Cache[$word];
}
$stem = $word;
do {
if (!preg_match($this->RVRE, $word, $p)) break;
$start = $p[1];
$RV = $p[2];
if (!$RV) break;
# Step 1
if (!$this->s($RV, $this->PERFECTIVEGROUND, '')) {
$this->s($RV, $this->REFLEXIVE, '');
if ($this->s($RV, $this->ADJECTIVE, '')) {
$this->s($RV, $this->PARTICIPLE, '');
} else {
if (!$this->s($RV, $this->VERB, ''))
$this->s($RV, $this->NOUN, '');
}
}
# Step 2
$this->s($RV, '/и$/', '');
# Step 3
if ($this->m($RV, $this->DERIVATIONAL))
$this->s($RV, '/ость?$/', '');
# Step 4
if (!$this->s($RV, '/ь$/', '')) {
$this->s($RV, '/ейше?/', '');
$this->s($RV, '/нн$/', 'н');
}
$stem = $start.$RV;
} while(false);
if ($this->Stem_Caching) $this->Stem_Cache[$word] = $stem;
return $stem;
}
function stem_caching($parm_ref)
{
$caching_level = @$parm_ref['-level'];
if ($caching_level) {
if (!$this->m($caching_level, '/^[012]$/')) {
die(__CLASS__ . "::stem_caching() - Legal values are '0','1' or '2'. '$caching_level' is not a legal value");
}
$this->Stem_Caching = $caching_level;
}
return $this->Stem_Caching;
}
function clear_stem_cache()
{
$this->Stem_Cache = array();
}
}
?>
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