| /* |
| * 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.hu; |
| |
| |
| /* |
| * This algorithm is updated based on code located at: |
| * http://members.unine.ch/jacques.savoy/clef/ |
| * |
| * Full copyright for that code follows: |
| */ |
| |
| /* |
| * Copyright (c) 2005, Jacques Savoy |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are met: |
| * |
| * Redistributions of source code must retain the above copyright notice, this |
| * list of conditions and the following disclaimer. Redistributions in binary |
| * form must reproduce the above copyright notice, this list of conditions and |
| * the following disclaimer in the documentation and/or other materials |
| * provided with the distribution. Neither the name of the author nor the names |
| * of its contributors may be used to endorse or promote products derived from |
| * this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" |
| * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE |
| * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR |
| * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF |
| * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN |
| * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) |
| * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE |
| * POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| import static org.apache.lucene.analysis.util.StemmerUtil.*; |
| |
| /** |
| * Light Stemmer for Hungarian. |
| * <p> |
| * This stemmer implements the "UniNE" algorithm in: |
| * <i>Light Stemming Approaches for the French, Portuguese, German and Hungarian Languages</i> |
| * Jacques Savoy |
| */ |
| public class HungarianLightStemmer { |
| public int stem(char s[], int len) { |
| for (int i = 0; i < len; i++) |
| switch(s[i]) { |
| case 'á': s[i] = 'a'; break; |
| case 'ë': |
| case 'é': s[i] = 'e'; break; |
| case 'í': s[i] = 'i'; break; |
| case 'ó': |
| case 'ő': |
| case 'õ': |
| case 'ö': s[i] = 'o'; break; |
| case 'ú': |
| case 'ű': |
| case 'ũ': |
| case 'û': |
| case 'ü': s[i] = 'u'; break; |
| } |
| |
| len = removeCase(s, len); |
| len = removePossessive(s, len); |
| len = removePlural(s, len); |
| return normalize(s, len); |
| } |
| |
| private int removeCase(char s[], int len) { |
| if (len > 6 && endsWith(s, len, "kent")) |
| return len - 4; |
| |
| if (len > 5) { |
| if (endsWith(s, len, "nak") || |
| endsWith(s, len, "nek") || |
| endsWith(s, len, "val") || |
| endsWith(s, len, "vel") || |
| endsWith(s, len, "ert") || |
| endsWith(s, len, "rol") || |
| endsWith(s, len, "ban") || |
| endsWith(s, len, "ben") || |
| endsWith(s, len, "bol") || |
| endsWith(s, len, "nal") || |
| endsWith(s, len, "nel") || |
| endsWith(s, len, "hoz") || |
| endsWith(s, len, "hez") || |
| endsWith(s, len, "tol")) |
| return len - 3; |
| |
| if (endsWith(s, len, "al") || endsWith(s, len, "el")) { |
| if (!isVowel(s[len-3]) && s[len-3] == s[len-4]) |
| return len - 3; |
| } |
| } |
| |
| if (len > 4) { |
| if (endsWith(s, len, "at") || |
| endsWith(s, len, "et") || |
| endsWith(s, len, "ot") || |
| endsWith(s, len, "va") || |
| endsWith(s, len, "ve") || |
| endsWith(s, len, "ra") || |
| endsWith(s, len, "re") || |
| endsWith(s, len, "ba") || |
| endsWith(s, len, "be") || |
| endsWith(s, len, "ul") || |
| endsWith(s, len, "ig")) |
| return len - 2; |
| |
| if ((endsWith(s, len, "on") || endsWith(s, len, "en")) && !isVowel(s[len-3])) |
| return len - 2; |
| |
| switch(s[len-1]) { |
| case 't': |
| case 'n': return len - 1; |
| case 'a': |
| case 'e': if (s[len-2] == s[len-3] && !isVowel(s[len-2])) return len - 2; |
| } |
| } |
| |
| return len; |
| } |
| |
| private int removePossessive(char s[], int len) { |
| if (len > 6) { |
| if (!isVowel(s[len-5]) && |
| (endsWith(s, len, "atok") || |
| endsWith(s, len, "otok") || |
| endsWith(s, len, "etek"))) |
| return len - 4; |
| |
| if (endsWith(s, len, "itek") || endsWith(s, len, "itok")) |
| return len - 4; |
| } |
| |
| if (len > 5) { |
| if (!isVowel(s[len-4]) && |
| (endsWith(s, len, "unk") || |
| endsWith(s, len, "tok") || |
| endsWith(s, len, "tek"))) |
| return len - 3; |
| |
| if (isVowel(s[len-4]) && endsWith(s, len, "juk")) |
| return len - 3; |
| |
| if (endsWith(s, len, "ink")) |
| return len - 3; |
| } |
| |
| if (len > 4) { |
| if (!isVowel(s[len-3]) && |
| (endsWith(s, len, "am") || |
| endsWith(s, len, "em") || |
| endsWith(s, len, "om") || |
| endsWith(s, len, "ad") || |
| endsWith(s, len, "ed") || |
| endsWith(s, len, "od") || |
| endsWith(s, len, "uk"))) |
| return len - 2; |
| |
| if (isVowel(s[len-3]) && |
| (endsWith(s, len, "nk") || |
| endsWith(s, len, "ja") || |
| endsWith(s, len, "je"))) |
| return len - 2; |
| |
| if (endsWith(s, len, "im") || |
| endsWith(s, len, "id") || |
| endsWith(s, len, "ik")) |
| return len - 2; |
| } |
| |
| if (len > 3) |
| switch(s[len-1]) { |
| case 'a': |
| case 'e': if (!isVowel(s[len-2])) return len - 1; break; |
| case 'm': |
| case 'd': if (isVowel(s[len-2])) return len - 1; break; |
| case 'i': return len - 1; |
| } |
| |
| return len; |
| } |
| |
| @SuppressWarnings("fallthrough") |
| private int removePlural(char s[], int len) { |
| if (len > 3 && s[len-1] == 'k') |
| switch(s[len-2]) { |
| case 'a': |
| case 'o': |
| case 'e': if (len > 4) return len - 2; /* intentional fallthru */ |
| default: return len - 1; |
| } |
| return len; |
| } |
| |
| private int normalize(char s[], int len) { |
| if (len > 3) |
| switch(s[len-1]) { |
| case 'a': |
| case 'e': |
| case 'i': |
| case 'o': return len - 1; |
| } |
| return len; |
| } |
| |
| private boolean isVowel(char ch) { |
| switch(ch) { |
| case 'a': |
| case 'e': |
| case 'i': |
| case 'o': |
| case 'u': |
| case 'y': return true; |
| default: return false; |
| } |
| } |
| } |
