1 package org.apache.lucene.analysis.pt;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
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14 * distributed under the License is distributed on an "AS IS" BASIS,
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16 * See the License for the specific language governing permissions and
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21 * This algorithm is updated based on code located at:
22 * http://members.unine.ch/jacques.savoy/clef/
24 * Full copyright for that code follows:
28 * Copyright (c) 2005, Jacques Savoy
29 * All rights reserved.
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32 * modification, are permitted provided that the following conditions are met:
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40 * this software without specific prior written permission.
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55 import static org.apache.lucene.analysis.util.StemmerUtil.*;
58 * Light Stemmer for Portuguese
60 * This stemmer implements the "UniNE" algorithm in:
61 * <i>Light Stemming Approaches for the French, Portuguese, German and Hungarian Languages</i>
64 public class PortugueseLightStemmer {
66 public int stem(char s[], int len) {
70 len = removeSuffix(s, len);
72 if (len > 3 && s[len-1] == 'a')
73 len = normFeminine(s, len);
79 case 'o': len--; break;
82 for (int i = 0; i < len; i++)
88 case 'ã': s[i] = 'a'; break;
93 case 'õ': s[i] = 'o'; break;
97 case 'ë': s[i] = 'e'; break;
101 case 'ü': s[i] = 'u'; break;
105 case 'ï': s[i] = 'i'; break;
106 case 'ç': s[i] = 'c'; break;
112 private int removeSuffix(char s[], int len) {
113 if (len > 4 && endsWith(s, len, "es"))
118 case 'z': return len - 2;
121 if (len > 3 && endsWith(s, len, "ns")) {
126 if (len > 4 && (endsWith(s, len, "eis") || endsWith(s, len, "éis"))) {
132 if (len > 4 && endsWith(s, len, "ais")) {
137 if (len > 4 && endsWith(s, len, "óis")) {
143 if (len > 4 && endsWith(s, len, "is")) {
149 (endsWith(s, len, "ões") ||
150 endsWith(s, len, "ães"))) {
157 if (len > 6 && endsWith(s, len, "mente"))
160 if (len > 3 && s[len-1] == 's')
165 private int normFeminine(char s[], int len) {
167 (endsWith(s, len, "inha") ||
168 endsWith(s, len, "iaca") ||
169 endsWith(s, len, "eira"))) {
175 if (endsWith(s, len, "osa") ||
176 endsWith(s, len, "ica") ||
177 endsWith(s, len, "ida") ||
178 endsWith(s, len, "ada") ||
179 endsWith(s, len, "iva") ||
180 endsWith(s, len, "ama")) {
185 if (endsWith(s, len, "ona")) {
191 if (endsWith(s, len, "ora"))
194 if (endsWith(s, len, "esa")) {
199 if (endsWith(s, len, "na")) {