/*
* 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.ckb;
import static org.apache.lucene.analysis.util.StemmerUtil.delete;
/**
* Normalizes the Unicode representation of Sorani text.
* <p>
* Normalization consists of:
* <ul>
* <li>Alternate forms of 'y' (0064, 0649) are converted to 06CC (FARSI YEH)
* <li>Alternate form of 'k' (0643) is converted to 06A9 (KEHEH)
* <li>Alternate forms of vowel 'e' (0647+200C, word-final 0647, 0629) are converted to 06D5 (AE)
* <li>Alternate (joining) form of 'h' (06BE) is converted to 0647
* <li>Alternate forms of 'rr' (0692, word-initial 0631) are converted to 0695 (REH WITH SMALL V BELOW)
* <li>Harakat, tatweel, and formatting characters such as directional controls are removed.
* </ul>
*/
public class SoraniNormalizer {
static final char YEH = '\u064A';
static final char DOTLESS_YEH = '\u0649';
static final char FARSI_YEH = '\u06CC';
static final char KAF = '\u0643';
static final char KEHEH = '\u06A9';
static final char HEH = '\u0647';
static final char AE = '\u06D5';
static final char ZWNJ = '\u200C';
static final char HEH_DOACHASHMEE = '\u06BE';
static final char TEH_MARBUTA = '\u0629';
static final char REH = '\u0631';
static final char RREH = '\u0695';
static final char RREH_ABOVE = '\u0692';
static final char TATWEEL = '\u0640';
static final char FATHATAN = '\u064B';
static final char DAMMATAN = '\u064C';
static final char KASRATAN = '\u064D';
static final char FATHA = '\u064E';
static final char DAMMA = '\u064F';
static final char KASRA = '\u0650';
static final char SHADDA = '\u0651';
static final char SUKUN = '\u0652';
/**
* Normalize an input buffer of Sorani text
*
* @param s input buffer
* @param len length of input buffer
* @return length of input buffer after normalization
*/
public int normalize(char s[], int len) {
for (int i = 0; i < len; i++) {
switch (s[i]) {
case YEH:
case DOTLESS_YEH:
s[i] = FARSI_YEH;
break;
case KAF:
s[i] = KEHEH;
break;
case ZWNJ:
if (i > 0 && s[i-1] == HEH) {
s[i-1] = AE;
}
len = delete(s, i, len);
i--;
break;
case HEH:
if (i == len-1) {
s[i] = AE;
}
break;
case TEH_MARBUTA:
s[i] = AE;
break;
case HEH_DOACHASHMEE:
s[i] = HEH;
break;
case REH:
if (i == 0) {
s[i] = RREH;
}
break;
case RREH_ABOVE:
s[i] = RREH;
break;
case TATWEEL:
case KASRATAN:
case DAMMATAN:
case FATHATAN:
case FATHA:
case DAMMA:
case KASRA:
case SHADDA:
case SUKUN:
len = delete(s, i, len);
i--;
break;
default:
if (Character.getType(s[i]) == Character.FORMAT) {
len = delete(s, i, len);
i--;
}
}
}
return len;
}
}