org.apache.lucene.analysis.br.BrazilianStemmer Maven / Gradle / Ivy
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/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.lucene.analysis.br;
import java.util.Locale;
/**
* A stemmer for Brazilian Portuguese words.
*/
public class BrazilianStemmer {
private static final Locale locale = new Locale("pt", "BR");
/**
* Changed term
*/
private String TERM ;
private String CT ;
private String R1 ;
private String R2 ;
private String RV ;
public BrazilianStemmer() {
}
/**
* Stems the given term to an unique discriminator.
*
* @param term The term that should be stemmed.
* @return Discriminator for term
*/
protected String stem( String term ) {
boolean altered = false ; // altered the term
// creates CT
createCT(term) ;
if ( !isIndexable( CT ) ) {
return null;
}
if ( !isStemmable( CT ) ) {
return CT ;
}
R1 = getR1(CT) ;
R2 = getR1(R1) ;
RV = getRV(CT) ;
TERM = term + ";" +CT ;
altered = step1() ;
if (!altered) {
altered = step2() ;
}
if (altered) {
step3();
} else {
step4();
}
step5() ;
return CT ;
}
/**
* Checks a term if it can be processed correctly.
*
* @return true if, and only if, the given term consists in letters.
*/
private boolean isStemmable( String term ) {
for ( int c = 0; c < term.length(); c++ ) {
// Discard terms that contain non-letter characters.
if ( !Character.isLetter(term.charAt(c))) {
return false;
}
}
return true;
}
/**
* Checks a term if it can be processed indexed.
*
* @return true if it can be indexed
*/
private boolean isIndexable( String term ) {
return (term.length() < 30) && (term.length() > 2) ;
}
/**
* See if string is 'a','e','i','o','u'
*
* @return true if is vowel
*/
private boolean isVowel( char value ) {
return (value == 'a') ||
(value == 'e') ||
(value == 'i') ||
(value == 'o') ||
(value == 'u') ;
}
/**
* Gets R1
*
* R1 - is the region after the first non-vowel following a vowel,
* or is the null region at the end of the word if there is
* no such non-vowel.
*
* @return null or a string representing R1
*/
private String getR1( String value ) {
int i;
int j;
// be-safe !!!
if (value == null) {
return null ;
}
// find 1st vowel
i = value.length()-1 ;
for (j=0 ; j < i ; j++) {
if (isVowel(value.charAt(j))) {
break ;
}
}
if (!(j < i)) {
return null ;
}
// find 1st non-vowel
for ( ; j < i ; j++) {
if (!(isVowel(value.charAt(j)))) {
break ;
}
}
if (!(j < i)) {
return null ;
}
return value.substring(j+1) ;
}
/**
* Gets RV
*
* RV - IF the second letter is a consonant, RV is the region after
* the next following vowel,
*
* OR if the first two letters are vowels, RV is the region
* after the next consonant,
*
* AND otherwise (consonant-vowel case) RV is the region after
* the third letter.
*
* BUT RV is the end of the word if this positions cannot be
* found.
*
* @return null or a string representing RV
*/
private String getRV( String value ) {
int i;
int j;
// be-safe !!!
if (value == null) {
return null ;
}
i = value.length()-1 ;
// RV - IF the second letter is a consonant, RV is the region after
// the next following vowel,
if ((i > 0) && !isVowel(value.charAt(1))) {
// find 1st vowel
for (j=2 ; j < i ; j++) {
if (isVowel(value.charAt(j))) {
break ;
}
}
if (j < i) {
return value.substring(j+1) ;
}
}
// RV - OR if the first two letters are vowels, RV is the region
// after the next consonant,
if ((i > 1) &&
isVowel(value.charAt(0)) &&
isVowel(value.charAt(1))) {
// find 1st consoant
for (j=2 ; j < i ; j++) {
if (!isVowel(value.charAt(j))) {
break ;
}
}
if (j < i) {
return value.substring(j+1) ;
}
}
// RV - AND otherwise (consonant-vowel case) RV is the region after
// the third letter.
if (i > 2) {
return value.substring(3) ;
}
return null ;
}
/**
* 1) Turn to lowercase
* 2) Remove accents
* 3) ã -> a ; õ -> o
* 4) ç -> c
*
* @return null or a string transformed
*/
private String changeTerm( String value ) {
int j;
String r = "" ;
// be-safe !!!
if (value == null) {
return null ;
}
value = value.toLowerCase(locale) ;
for (j=0 ; j < value.length() ; j++) {
if ((value.charAt(j) == 'á') ||
(value.charAt(j) == 'â') ||
(value.charAt(j) == 'ã')) {
r= r + "a" ; continue ;
}
if ((value.charAt(j) == 'é') ||
(value.charAt(j) == 'ê')) {
r= r + "e" ; continue ;
}
if (value.charAt(j) == 'í') {
r= r + "i" ; continue ;
}
if ((value.charAt(j) == 'ó') ||
(value.charAt(j) == 'ô') ||
(value.charAt(j) == 'õ')) {
r= r + "o" ; continue ;
}
if ((value.charAt(j) == 'ú') ||
(value.charAt(j) == 'ü')) {
r= r + "u" ; continue ;
}
if (value.charAt(j) == 'ç') {
r= r + "c" ; continue ;
}
if (value.charAt(j) == 'ñ') {
r= r + "n" ; continue ;
}
r= r+ value.charAt(j) ;
}
return r ;
}
/**
* Check if a string ends with a suffix
*
* @return true if the string ends with the specified suffix
*/
private boolean suffix( String value, String suffix ) {
// be-safe !!!
if ((value == null) || (suffix == null)) {
return false ;
}
if (suffix.length() > value.length()) {
return false ;
}
return value.substring(value.length()-suffix.length()).equals(suffix);
}
/**
* Replace a string suffix by another
*
* @return the replaced String
*/
private String replaceSuffix( String value, String toReplace, String changeTo ) {
String vvalue ;
// be-safe !!!
if ((value == null) ||
(toReplace == null) ||
(changeTo == null) ) {
return value ;
}
vvalue = removeSuffix(value,toReplace) ;
if (value.equals(vvalue)) {
return value ;
} else {
return vvalue + changeTo ;
}
}
/**
* Remove a string suffix
*
* @return the String without the suffix
*/
private String removeSuffix( String value, String toRemove ) {
// be-safe !!!
if ((value == null) ||
(toRemove == null) ||
!suffix(value,toRemove) ) {
return value ;
}
return value.substring(0,value.length()-toRemove.length()) ;
}
/**
* See if a suffix is preceded by a String
*
* @return true if the suffix is preceded
*/
private boolean suffixPreceded( String value, String suffix, String preceded ) {
// be-safe !!!
if ((value == null) ||
(suffix == null) ||
(preceded == null) ||
!suffix(value,suffix) ) {
return false ;
}
return suffix(removeSuffix(value,suffix),preceded) ;
}
/**
* Creates CT (changed term) , substituting * 'ã' and 'õ' for 'a~' and 'o~'.
*/
private void createCT( String term ) {
CT = changeTerm(term) ;
if (CT.length() < 2) return ;
// if the first character is ... , remove it
if ((CT.charAt(0) == '"') ||
(CT.charAt(0) == '\'') ||
(CT.charAt(0) == '-') ||
(CT.charAt(0) == ',') ||
(CT.charAt(0) == ';') ||
(CT.charAt(0) == '.') ||
(CT.charAt(0) == '?') ||
(CT.charAt(0) == '!')
) {
CT = CT.substring(1);
}
if (CT.length() < 2) return ;
// if the last character is ... , remove it
if ((CT.charAt(CT.length()-1) == '-') ||
(CT.charAt(CT.length()-1) == ',') ||
(CT.charAt(CT.length()-1) == ';') ||
(CT.charAt(CT.length()-1) == '.') ||
(CT.charAt(CT.length()-1) == '?') ||
(CT.charAt(CT.length()-1) == '!') ||
(CT.charAt(CT.length()-1) == '\'') ||
(CT.charAt(CT.length()-1) == '"')
) {
CT = CT.substring(0,CT.length()-1);
}
}
/**
* Standard suffix removal.
* Search for the longest among the following suffixes, and perform
* the following actions:
*
* @return false if no ending was removed
*/
private boolean step1() {
if (CT == null) return false ;
// suffix length = 7
if (suffix(CT,"uciones") && suffix(R2,"uciones")) {
CT = replaceSuffix(CT,"uciones","u") ; return true;
}
// suffix length = 6
if (CT.length() >= 6) {
if (suffix(CT,"imentos") && suffix(R2,"imentos")) {
CT = removeSuffix(CT,"imentos") ; return true;
}
if (suffix(CT,"amentos") && suffix(R2,"amentos")) {
CT = removeSuffix(CT,"amentos") ; return true;
}
if (suffix(CT,"adores") && suffix(R2,"adores")) {
CT = removeSuffix(CT,"adores") ; return true;
}
if (suffix(CT,"adoras") && suffix(R2,"adoras")) {
CT = removeSuffix(CT,"adoras") ; return true;
}
if (suffix(CT,"logias") && suffix(R2,"logias")) {
replaceSuffix(CT,"logias","log") ; return true;
}
if (suffix(CT,"encias") && suffix(R2,"encias")) {
CT = replaceSuffix(CT,"encias","ente") ; return true;
}
if (suffix(CT,"amente") && suffix(R1,"amente")) {
CT = removeSuffix(CT,"amente") ; return true;
}
if (suffix(CT,"idades") && suffix(R2,"idades")) {
CT = removeSuffix(CT,"idades") ; return true;
}
}
// suffix length = 5
if (CT.length() >= 5) {
if (suffix(CT,"acoes") && suffix(R2,"acoes")) {
CT = removeSuffix(CT,"acoes") ; return true;
}
if (suffix(CT,"imento") && suffix(R2,"imento")) {
CT = removeSuffix(CT,"imento") ; return true;
}
if (suffix(CT,"amento") && suffix(R2,"amento")) {
CT = removeSuffix(CT,"amento") ; return true;
}
if (suffix(CT,"adora") && suffix(R2,"adora")) {
CT = removeSuffix(CT,"adora") ; return true;
}
if (suffix(CT,"ismos") && suffix(R2,"ismos")) {
CT = removeSuffix(CT,"ismos") ; return true;
}
if (suffix(CT,"istas") && suffix(R2,"istas")) {
CT = removeSuffix(CT,"istas") ; return true;
}
if (suffix(CT,"logia") && suffix(R2,"logia")) {
CT = replaceSuffix(CT,"logia","log") ; return true;
}
if (suffix(CT,"ucion") && suffix(R2,"ucion")) {
CT = replaceSuffix(CT,"ucion","u") ; return true;
}
if (suffix(CT,"encia") && suffix(R2,"encia")) {
CT = replaceSuffix(CT,"encia","ente") ; return true;
}
if (suffix(CT,"mente") && suffix(R2,"mente")) {
CT = removeSuffix(CT,"mente") ; return true;
}
if (suffix(CT,"idade") && suffix(R2,"idade")) {
CT = removeSuffix(CT,"idade") ; return true;
}
}
// suffix length = 4
if (CT.length() >= 4) {
if (suffix(CT,"acao") && suffix(R2,"acao")) {
CT = removeSuffix(CT,"acao") ; return true;
}
if (suffix(CT,"ezas") && suffix(R2,"ezas")) {
CT = removeSuffix(CT,"ezas") ; return true;
}
if (suffix(CT,"icos") && suffix(R2,"icos")) {
CT = removeSuffix(CT,"icos") ; return true ;
}
if (suffix(CT,"icas") && suffix(R2,"icas")) {
CT = removeSuffix(CT,"icas") ; return true ;
}
if (suffix(CT,"ismo") && suffix(R2,"ismo")) {
CT = removeSuffix(CT,"ismo") ; return true ;
}
if (suffix(CT,"avel") && suffix(R2,"avel")) {
CT = removeSuffix(CT,"avel") ; return true ;
}
if (suffix(CT,"ivel") && suffix(R2,"ivel")) {
CT = removeSuffix(CT,"ivel") ; return true ;
}
if (suffix(CT,"ista") && suffix(R2,"ista")) {
CT = removeSuffix(CT,"ista") ; return true ;
}
if (suffix(CT,"osos") && suffix(R2,"osos")) {
CT = removeSuffix(CT,"osos") ; return true ;
}
if (suffix(CT,"osas") && suffix(R2,"osas")) {
CT = removeSuffix(CT,"osas") ; return true ;
}
if (suffix(CT,"ador") && suffix(R2,"ador")) {
CT = removeSuffix(CT,"ador") ; return true ;
}
if (suffix(CT,"ivas") && suffix(R2,"ivas")) {
CT = removeSuffix(CT,"ivas") ; return true ;
}
if (suffix(CT,"ivos") && suffix(R2,"ivos")) {
CT = removeSuffix(CT,"ivos") ; return true ;
}
if (suffix(CT,"iras") &&
suffix(RV,"iras") &&
suffixPreceded(CT,"iras","e")) {
CT = replaceSuffix(CT,"iras","ir") ; return true ;
}
}
// suffix length = 3
if (CT.length() >= 3) {
if (suffix(CT,"eza") && suffix(R2,"eza")) {
CT = removeSuffix(CT,"eza") ; return true ;
}
if (suffix(CT,"ico") && suffix(R2,"ico")) {
CT = removeSuffix(CT,"ico") ; return true ;
}
if (suffix(CT,"ica") && suffix(R2,"ica")) {
CT = removeSuffix(CT,"ica") ; return true ;
}
if (suffix(CT,"oso") && suffix(R2,"oso")) {
CT = removeSuffix(CT,"oso") ; return true ;
}
if (suffix(CT,"osa") && suffix(R2,"osa")) {
CT = removeSuffix(CT,"osa") ; return true ;
}
if (suffix(CT,"iva") && suffix(R2,"iva")) {
CT = removeSuffix(CT,"iva") ; return true ;
}
if (suffix(CT,"ivo") && suffix(R2,"ivo")) {
CT = removeSuffix(CT,"ivo") ; return true ;
}
if (suffix(CT,"ira") &&
suffix(RV,"ira") &&
suffixPreceded(CT,"ira","e")) {
CT = replaceSuffix(CT,"ira","ir") ; return true ;
}
}
// no ending was removed by step1
return false ;
}
/**
* Verb suffixes.
*
* Search for the longest among the following suffixes in RV,
* and if found, delete.
*
* @return false if no ending was removed
*/
private boolean step2() {
if (RV == null) return false ;
// suffix lenght = 7
if (RV.length() >= 7) {
if (suffix(RV,"issemos")) {
CT = removeSuffix(CT,"issemos") ; return true;
}
if (suffix(RV,"essemos")) {
CT = removeSuffix(CT,"essemos") ; return true;
}
if (suffix(RV,"assemos")) {
CT = removeSuffix(CT,"assemos") ; return true;
}
if (suffix(RV,"ariamos")) {
CT = removeSuffix(CT,"ariamos") ; return true;
}
if (suffix(RV,"eriamos")) {
CT = removeSuffix(CT,"eriamos") ; return true;
}
if (suffix(RV,"iriamos")) {
CT = removeSuffix(CT,"iriamos") ; return true;
}
}
// suffix length = 6
if (RV.length() >= 6) {
if (suffix(RV,"iremos")) {
CT = removeSuffix(CT,"iremos") ; return true;
}
if (suffix(RV,"eremos")) {
CT = removeSuffix(CT,"eremos") ; return true;
}
if (suffix(RV,"aremos")) {
CT = removeSuffix(CT,"aremos") ; return true;
}
if (suffix(RV,"avamos")) {
CT = removeSuffix(CT,"avamos") ; return true;
}
if (suffix(RV,"iramos")) {
CT = removeSuffix(CT,"iramos") ; return true;
}
if (suffix(RV,"eramos")) {
CT = removeSuffix(CT,"eramos") ; return true;
}
if (suffix(RV,"aramos")) {
CT = removeSuffix(CT,"aramos") ; return true;
}
if (suffix(RV,"asseis")) {
CT = removeSuffix(CT,"asseis") ; return true;
}
if (suffix(RV,"esseis")) {
CT = removeSuffix(CT,"esseis") ; return true;
}
if (suffix(RV,"isseis")) {
CT = removeSuffix(CT,"isseis") ; return true;
}
if (suffix(RV,"arieis")) {
CT = removeSuffix(CT,"arieis") ; return true;
}
if (suffix(RV,"erieis")) {
CT = removeSuffix(CT,"erieis") ; return true;
}
if (suffix(RV,"irieis")) {
CT = removeSuffix(CT,"irieis") ; return true;
}
}
// suffix length = 5
if (RV.length() >= 5) {
if (suffix(RV,"irmos")) {
CT = removeSuffix(CT,"irmos") ; return true;
}
if (suffix(RV,"iamos")) {
CT = removeSuffix(CT,"iamos") ; return true;
}
if (suffix(RV,"armos")) {
CT = removeSuffix(CT,"armos") ; return true;
}
if (suffix(RV,"ermos")) {
CT = removeSuffix(CT,"ermos") ; return true;
}
if (suffix(RV,"areis")) {
CT = removeSuffix(CT,"areis") ; return true;
}
if (suffix(RV,"ereis")) {
CT = removeSuffix(CT,"ereis") ; return true;
}
if (suffix(RV,"ireis")) {
CT = removeSuffix(CT,"ireis") ; return true;
}
if (suffix(RV,"asses")) {
CT = removeSuffix(CT,"asses") ; return true;
}
if (suffix(RV,"esses")) {
CT = removeSuffix(CT,"esses") ; return true;
}
if (suffix(RV,"isses")) {
CT = removeSuffix(CT,"isses") ; return true;
}
if (suffix(RV,"astes")) {
CT = removeSuffix(CT,"astes") ; return true;
}
if (suffix(RV,"assem")) {
CT = removeSuffix(CT,"assem") ; return true;
}
if (suffix(RV,"essem")) {
CT = removeSuffix(CT,"essem") ; return true;
}
if (suffix(RV,"issem")) {
CT = removeSuffix(CT,"issem") ; return true;
}
if (suffix(RV,"ardes")) {
CT = removeSuffix(CT,"ardes") ; return true;
}
if (suffix(RV,"erdes")) {
CT = removeSuffix(CT,"erdes") ; return true;
}
if (suffix(RV,"irdes")) {
CT = removeSuffix(CT,"irdes") ; return true;
}
if (suffix(RV,"ariam")) {
CT = removeSuffix(CT,"ariam") ; return true;
}
if (suffix(RV,"eriam")) {
CT = removeSuffix(CT,"eriam") ; return true;
}
if (suffix(RV,"iriam")) {
CT = removeSuffix(CT,"iriam") ; return true;
}
if (suffix(RV,"arias")) {
CT = removeSuffix(CT,"arias") ; return true;
}
if (suffix(RV,"erias")) {
CT = removeSuffix(CT,"erias") ; return true;
}
if (suffix(RV,"irias")) {
CT = removeSuffix(CT,"irias") ; return true;
}
if (suffix(RV,"estes")) {
CT = removeSuffix(CT,"estes") ; return true;
}
if (suffix(RV,"istes")) {
CT = removeSuffix(CT,"istes") ; return true;
}
if (suffix(RV,"areis")) {
CT = removeSuffix(CT,"areis") ; return true;
}
if (suffix(RV,"aveis")) {
CT = removeSuffix(CT,"aveis") ; return true;
}
}
// suffix length = 4
if (RV.length() >= 4) {
if (suffix(RV,"aria")) {
CT = removeSuffix(CT,"aria") ; return true;
}
if (suffix(RV,"eria")) {
CT = removeSuffix(CT,"eria") ; return true;
}
if (suffix(RV,"iria")) {
CT = removeSuffix(CT,"iria") ; return true;
}
if (suffix(RV,"asse")) {
CT = removeSuffix(CT,"asse") ; return true;
}
if (suffix(RV,"esse")) {
CT = removeSuffix(CT,"esse") ; return true;
}
if (suffix(RV,"isse")) {
CT = removeSuffix(CT,"isse") ; return true;
}
if (suffix(RV,"aste")) {
CT = removeSuffix(CT,"aste") ; return true;
}
if (suffix(RV,"este")) {
CT = removeSuffix(CT,"este") ; return true;
}
if (suffix(RV,"iste")) {
CT = removeSuffix(CT,"iste") ; return true;
}
if (suffix(RV,"arei")) {
CT = removeSuffix(CT,"arei") ; return true;
}
if (suffix(RV,"erei")) {
CT = removeSuffix(CT,"erei") ; return true;
}
if (suffix(RV,"irei")) {
CT = removeSuffix(CT,"irei") ; return true;
}
if (suffix(RV,"aram")) {
CT = removeSuffix(CT,"aram") ; return true;
}
if (suffix(RV,"eram")) {
CT = removeSuffix(CT,"eram") ; return true;
}
if (suffix(RV,"iram")) {
CT = removeSuffix(CT,"iram") ; return true;
}
if (suffix(RV,"avam")) {
CT = removeSuffix(CT,"avam") ; return true;
}
if (suffix(RV,"arem")) {
CT = removeSuffix(CT,"arem") ; return true;
}
if (suffix(RV,"erem")) {
CT = removeSuffix(CT,"erem") ; return true;
}
if (suffix(RV,"irem")) {
CT = removeSuffix(CT,"irem") ; return true;
}
if (suffix(RV,"ando")) {
CT = removeSuffix(CT,"ando") ; return true;
}
if (suffix(RV,"endo")) {
CT = removeSuffix(CT,"endo") ; return true;
}
if (suffix(RV,"indo")) {
CT = removeSuffix(CT,"indo") ; return true;
}
if (suffix(RV,"arao")) {
CT = removeSuffix(CT,"arao") ; return true;
}
if (suffix(RV,"erao")) {
CT = removeSuffix(CT,"erao") ; return true;
}
if (suffix(RV,"irao")) {
CT = removeSuffix(CT,"irao") ; return true;
}
if (suffix(RV,"adas")) {
CT = removeSuffix(CT,"adas") ; return true;
}
if (suffix(RV,"idas")) {
CT = removeSuffix(CT,"idas") ; return true;
}
if (suffix(RV,"aras")) {
CT = removeSuffix(CT,"aras") ; return true;
}
if (suffix(RV,"eras")) {
CT = removeSuffix(CT,"eras") ; return true;
}
if (suffix(RV,"iras")) {
CT = removeSuffix(CT,"iras") ; return true;
}
if (suffix(RV,"avas")) {
CT = removeSuffix(CT,"avas") ; return true;
}
if (suffix(RV,"ares")) {
CT = removeSuffix(CT,"ares") ; return true;
}
if (suffix(RV,"eres")) {
CT = removeSuffix(CT,"eres") ; return true;
}
if (suffix(RV,"ires")) {
CT = removeSuffix(CT,"ires") ; return true;
}
if (suffix(RV,"ados")) {
CT = removeSuffix(CT,"ados") ; return true;
}
if (suffix(RV,"idos")) {
CT = removeSuffix(CT,"idos") ; return true;
}
if (suffix(RV,"amos")) {
CT = removeSuffix(CT,"amos") ; return true;
}
if (suffix(RV,"emos")) {
CT = removeSuffix(CT,"emos") ; return true;
}
if (suffix(RV,"imos")) {
CT = removeSuffix(CT,"imos") ; return true;
}
if (suffix(RV,"iras")) {
CT = removeSuffix(CT,"iras") ; return true;
}
if (suffix(RV,"ieis")) {
CT = removeSuffix(CT,"ieis") ; return true;
}
}
// suffix length = 3
if (RV.length() >= 3) {
if (suffix(RV,"ada")) {
CT = removeSuffix(CT,"ada") ; return true;
}
if (suffix(RV,"ida")) {
CT = removeSuffix(CT,"ida") ; return true;
}
if (suffix(RV,"ara")) {
CT = removeSuffix(CT,"ara") ; return true;
}
if (suffix(RV,"era")) {
CT = removeSuffix(CT,"era") ; return true;
}
if (suffix(RV,"ira")) {
CT = removeSuffix(CT,"ava") ; return true;
}
if (suffix(RV,"iam")) {
CT = removeSuffix(CT,"iam") ; return true;
}
if (suffix(RV,"ado")) {
CT = removeSuffix(CT,"ado") ; return true;
}
if (suffix(RV,"ido")) {
CT = removeSuffix(CT,"ido") ; return true;
}
if (suffix(RV,"ias")) {
CT = removeSuffix(CT,"ias") ; return true;
}
if (suffix(RV,"ais")) {
CT = removeSuffix(CT,"ais") ; return true;
}
if (suffix(RV,"eis")) {
CT = removeSuffix(CT,"eis") ; return true;
}
if (suffix(RV,"ira")) {
CT = removeSuffix(CT,"ira") ; return true;
}
if (suffix(RV,"ear")) {
CT = removeSuffix(CT,"ear") ; return true;
}
}
// suffix length = 2
if (RV.length() >= 2) {
if (suffix(RV,"ia")) {
CT = removeSuffix(CT,"ia") ; return true;
}
if (suffix(RV,"ei")) {
CT = removeSuffix(CT,"ei") ; return true;
}
if (suffix(RV,"am")) {
CT = removeSuffix(CT,"am") ; return true;
}
if (suffix(RV,"em")) {
CT = removeSuffix(CT,"em") ; return true;
}
if (suffix(RV,"ar")) {
CT = removeSuffix(CT,"ar") ; return true;
}
if (suffix(RV,"er")) {
CT = removeSuffix(CT,"er") ; return true;
}
if (suffix(RV,"ir")) {
CT = removeSuffix(CT,"ir") ; return true;
}
if (suffix(RV,"as")) {
CT = removeSuffix(CT,"as") ; return true;
}
if (suffix(RV,"es")) {
CT = removeSuffix(CT,"es") ; return true;
}
if (suffix(RV,"is")) {
CT = removeSuffix(CT,"is") ; return true;
}
if (suffix(RV,"eu")) {
CT = removeSuffix(CT,"eu") ; return true;
}
if (suffix(RV,"iu")) {
CT = removeSuffix(CT,"iu") ; return true;
}
if (suffix(RV,"iu")) {
CT = removeSuffix(CT,"iu") ; return true;
}
if (suffix(RV,"ou")) {
CT = removeSuffix(CT,"ou") ; return true;
}
}
// no ending was removed by step2
return false ;
}
/**
* Delete suffix 'i' if in RV and preceded by 'c'
*
*/
private void step3() {
if (RV == null) return ;
if (suffix(RV,"i") && suffixPreceded(RV,"i","c")) {
CT = removeSuffix(CT,"i") ;
}
}
/**
* Residual suffix
*
* If the word ends with one of the suffixes (os a i o á í ó)
* in RV, delete it
*
*/
private void step4() {
if (RV == null) return ;
if (suffix(RV,"os")) {
CT = removeSuffix(CT,"os") ; return ;
}
if (suffix(RV,"a")) {
CT = removeSuffix(CT,"a") ; return ;
}
if (suffix(RV,"i")) {
CT = removeSuffix(CT,"i") ; return ;
}
if (suffix(RV,"o")) {
CT = removeSuffix(CT,"o") ; return ;
}
}
/**
* If the word ends with one of ( e é ê) in RV,delete it,
* and if preceded by 'gu' (or 'ci') with the 'u' (or 'i') in RV,
* delete the 'u' (or 'i')
*
* Or if the word ends ç remove the cedilha
*
*/
private void step5() {
if (RV == null) return ;
if (suffix(RV,"e")) {
if (suffixPreceded(RV,"e","gu")) {
CT = removeSuffix(CT,"e") ;
CT = removeSuffix(CT,"u") ;
return ;
}
if (suffixPreceded(RV,"e","ci")) {
CT = removeSuffix(CT,"e") ;
CT = removeSuffix(CT,"i") ;
return ;
}
CT = removeSuffix(CT,"e") ; return ;
}
}
/**
* For log and debug purpose
*
* @return TERM, CT, RV, R1 and R2
*/
public String log() {
return " (TERM = " + TERM + ")" +
" (CT = " + CT +")" +
" (RV = " + RV +")" +
" (R1 = " + R1 +")" +
" (R2 = " + R2 +")" ;
}
}