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package org.apache.lucene.analysis.pt;


import java.util.Map;

Portuguese stemmer implementing the RSLP (Removedor de Sufixos da Lingua Portuguesa) algorithm. This is sometimes also referred to as the Orengo stemmer.
See Also:
  • RSLPStemmerBase
/** * Portuguese stemmer implementing the RSLP (Removedor de Sufixos da Lingua Portuguesa) * algorithm. This is sometimes also referred to as the Orengo stemmer. * * @see RSLPStemmerBase */
public class PortugueseStemmer extends RSLPStemmerBase { private static final Step plural, feminine, adverb, augmentative, noun, verb, vowel; static { Map<String,Step> steps = parse(PortugueseStemmer.class, "portuguese.rslp"); plural = steps.get("Plural"); feminine = steps.get("Feminine"); adverb = steps.get("Adverb"); augmentative = steps.get("Augmentative"); noun = steps.get("Noun"); verb = steps.get("Verb"); vowel = steps.get("Vowel"); }
Params:
  • s – buffer, oversized to at least len+1
  • len – initial valid length of buffer
Returns:new valid length, stemmed
/** * @param s buffer, oversized to at least <code>len+1</code> * @param len initial valid length of buffer * @return new valid length, stemmed */
public int stem(char s[], int len) { assert s.length >= len + 1 : "this stemmer requires an oversized array of at least 1"; len = plural.apply(s, len); len = adverb.apply(s, len); len = feminine.apply(s, len); len = augmentative.apply(s, len); int oldlen = len; len = noun.apply(s, len); if (len == oldlen) { /* suffix not removed */ oldlen = len; len = verb.apply(s, len); if (len == oldlen) { /* suffix not removed */ len = vowel.apply(s, len); } } // rslp accent removal for (int i = 0; i < len; i++) { switch(s[i]) { case 'à': case 'á': case 'â': case 'ã': case 'ä': case 'å': s[i] = 'a'; break; case 'ç': s[i] = 'c'; break; case 'è': case 'é': case 'ê': case 'ë': s[i] = 'e'; break; case 'ì': case 'í': case 'î': case 'ï': s[i] = 'i'; break; case 'ñ': s[i] = 'n'; break; case 'ò': case 'ó': case 'ô': case 'õ': case 'ö': s[i] = 'o'; break; case 'ù': case 'ú': case 'û': case 'ü': s[i] = 'u'; break; case 'ý': case 'ÿ': s[i] = 'y'; break; } } return len; } }