+++ /dev/null
-package org.apache.lucene.analysis.in;
-
-/**
- * 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.
- */
-
-import java.util.BitSet;
-import java.util.IdentityHashMap;
-import static java.lang.Character.UnicodeBlock.*;
-import static org.apache.lucene.analysis.util.StemmerUtil.*;
-
-/**
- * Normalizes the Unicode representation of text in Indian languages.
- * <p>
- * Follows guidelines from Unicode 5.2, chapter 6, South Asian Scripts I
- * and graphical decompositions from http://ldc.upenn.edu/myl/IndianScriptsUnicode.html
- * </p>
- */
-public class IndicNormalizer {
-
- private static class ScriptData {
- final int flag;
- final int base;
- BitSet decompMask;
-
- ScriptData(int flag, int base) {
- this.flag = flag;
- this.base = base;
- }
- }
-
- private static final IdentityHashMap<Character.UnicodeBlock,ScriptData> scripts =
- new IdentityHashMap<Character.UnicodeBlock,ScriptData>(9);
-
- private static int flag(Character.UnicodeBlock ub) {
- return scripts.get(ub).flag;
- }
-
- static {
- scripts.put(DEVANAGARI, new ScriptData(1, 0x0900));
- scripts.put(BENGALI, new ScriptData(2, 0x0980));
- scripts.put(GURMUKHI, new ScriptData(4, 0x0A00));
- scripts.put(GUJARATI, new ScriptData(8, 0x0A80));
- scripts.put(ORIYA, new ScriptData(16, 0x0B00));
- scripts.put(TAMIL, new ScriptData(32, 0x0B80));
- scripts.put(TELUGU, new ScriptData(64, 0x0C00));
- scripts.put(KANNADA, new ScriptData(128, 0x0C80));
- scripts.put(MALAYALAM, new ScriptData(256, 0x0D00));
- }
-
- /**
- * Decompositions according to Unicode 5.2,
- * and http://ldc.upenn.edu/myl/IndianScriptsUnicode.html
- *
- * Most of these are not handled by unicode normalization anyway.
- *
- * The numbers here represent offsets into the respective codepages,
- * with -1 representing null and 0xFF representing zero-width joiner.
- *
- * the columns are: ch1, ch2, ch3, res, flags
- * ch1, ch2, and ch3 are the decomposition
- * res is the composition, and flags are the scripts to which it applies.
- */
- private static final int decompositions[][] = {
- /* devanagari, gujarati vowel candra O */
- { 0x05, 0x3E, 0x45, 0x11, flag(DEVANAGARI) | flag(GUJARATI) },
- /* devanagari short O */
- { 0x05, 0x3E, 0x46, 0x12, flag(DEVANAGARI) },
- /* devanagari, gujarati letter O */
- { 0x05, 0x3E, 0x47, 0x13, flag(DEVANAGARI) | flag(GUJARATI) },
- /* devanagari letter AI, gujarati letter AU */
- { 0x05, 0x3E, 0x48, 0x14, flag(DEVANAGARI) | flag(GUJARATI) },
- /* devanagari, bengali, gurmukhi, gujarati, oriya AA */
- { 0x05, 0x3E, -1, 0x06, flag(DEVANAGARI) | flag(BENGALI) | flag(GURMUKHI) | flag(GUJARATI) | flag(ORIYA) },
- /* devanagari letter candra A */
- { 0x05, 0x45, -1, 0x72, flag(DEVANAGARI) },
- /* gujarati vowel candra E */
- { 0x05, 0x45, -1, 0x0D, flag(GUJARATI) },
- /* devanagari letter short A */
- { 0x05, 0x46, -1, 0x04, flag(DEVANAGARI) },
- /* gujarati letter E */
- { 0x05, 0x47, -1, 0x0F, flag(GUJARATI) },
- /* gurmukhi, gujarati letter AI */
- { 0x05, 0x48, -1, 0x10, flag(GURMUKHI) | flag(GUJARATI) },
- /* devanagari, gujarati vowel candra O */
- { 0x05, 0x49, -1, 0x11, flag(DEVANAGARI) | flag(GUJARATI) },
- /* devanagari short O */
- { 0x05, 0x4A, -1, 0x12, flag(DEVANAGARI) },
- /* devanagari, gujarati letter O */
- { 0x05, 0x4B, -1, 0x13, flag(DEVANAGARI) | flag(GUJARATI) },
- /* devanagari letter AI, gurmukhi letter AU, gujarati letter AU */
- { 0x05, 0x4C, -1, 0x14, flag(DEVANAGARI) | flag(GURMUKHI) | flag(GUJARATI) },
- /* devanagari, gujarati vowel candra O */
- { 0x06, 0x45, -1, 0x11, flag(DEVANAGARI) | flag(GUJARATI) },
- /* devanagari short O */
- { 0x06, 0x46, -1, 0x12, flag(DEVANAGARI) },
- /* devanagari, gujarati letter O */
- { 0x06, 0x47, -1, 0x13, flag(DEVANAGARI) | flag(GUJARATI) },
- /* devanagari letter AI, gujarati letter AU */
- { 0x06, 0x48, -1, 0x14, flag(DEVANAGARI) | flag(GUJARATI) },
- /* malayalam letter II */
- { 0x07, 0x57, -1, 0x08, flag(MALAYALAM) },
- /* devanagari letter UU */
- { 0x09, 0x41, -1, 0x0A, flag(DEVANAGARI) },
- /* tamil, malayalam letter UU (some styles) */
- { 0x09, 0x57, -1, 0x0A, flag(TAMIL) | flag(MALAYALAM) },
- /* malayalam letter AI */
- { 0x0E, 0x46, -1, 0x10, flag(MALAYALAM) },
- /* devanagari candra E */
- { 0x0F, 0x45, -1, 0x0D, flag(DEVANAGARI) },
- /* devanagari short E */
- { 0x0F, 0x46, -1, 0x0E, flag(DEVANAGARI) },
- /* devanagari AI */
- { 0x0F, 0x47, -1, 0x10, flag(DEVANAGARI) },
- /* oriya AI */
- { 0x0F, 0x57, -1, 0x10, flag(ORIYA) },
- /* malayalam letter OO */
- { 0x12, 0x3E, -1, 0x13, flag(MALAYALAM) },
- /* telugu, kannada letter AU */
- { 0x12, 0x4C, -1, 0x14, flag(TELUGU) | flag(KANNADA) },
- /* telugu letter OO */
- { 0x12, 0x55, -1, 0x13, flag(TELUGU) },
- /* tamil, malayalam letter AU */
- { 0x12, 0x57, -1, 0x14, flag(TAMIL) | flag(MALAYALAM) },
- /* oriya letter AU */
- { 0x13, 0x57, -1, 0x14, flag(ORIYA) },
- /* devanagari qa */
- { 0x15, 0x3C, -1, 0x58, flag(DEVANAGARI) },
- /* devanagari, gurmukhi khha */
- { 0x16, 0x3C, -1, 0x59, flag(DEVANAGARI) | flag(GURMUKHI) },
- /* devanagari, gurmukhi ghha */
- { 0x17, 0x3C, -1, 0x5A, flag(DEVANAGARI) | flag(GURMUKHI) },
- /* devanagari, gurmukhi za */
- { 0x1C, 0x3C, -1, 0x5B, flag(DEVANAGARI) | flag(GURMUKHI) },
- /* devanagari dddha, bengali, oriya rra */
- { 0x21, 0x3C, -1, 0x5C, flag(DEVANAGARI) | flag(BENGALI) | flag(ORIYA) },
- /* devanagari, bengali, oriya rha */
- { 0x22, 0x3C, -1, 0x5D, flag(DEVANAGARI) | flag(BENGALI) | flag(ORIYA) },
- /* malayalam chillu nn */
- { 0x23, 0x4D, 0xFF, 0x7A, flag(MALAYALAM) },
- /* bengali khanda ta */
- { 0x24, 0x4D, 0xFF, 0x4E, flag(BENGALI) },
- /* devanagari nnna */
- { 0x28, 0x3C, -1, 0x29, flag(DEVANAGARI) },
- /* malayalam chillu n */
- { 0x28, 0x4D, 0xFF, 0x7B, flag(MALAYALAM) },
- /* devanagari, gurmukhi fa */
- { 0x2B, 0x3C, -1, 0x5E, flag(DEVANAGARI) | flag(GURMUKHI) },
- /* devanagari, bengali yya */
- { 0x2F, 0x3C, -1, 0x5F, flag(DEVANAGARI) | flag(BENGALI) },
- /* telugu letter vocalic R */
- { 0x2C, 0x41, 0x41, 0x0B, flag(TELUGU) },
- /* devanagari rra */
- { 0x30, 0x3C, -1, 0x31, flag(DEVANAGARI) },
- /* malayalam chillu rr */
- { 0x30, 0x4D, 0xFF, 0x7C, flag(MALAYALAM) },
- /* malayalam chillu l */
- { 0x32, 0x4D, 0xFF, 0x7D, flag(MALAYALAM) },
- /* devanagari llla */
- { 0x33, 0x3C, -1, 0x34, flag(DEVANAGARI) },
- /* malayalam chillu ll */
- { 0x33, 0x4D, 0xFF, 0x7E, flag(MALAYALAM) },
- /* telugu letter MA */
- { 0x35, 0x41, -1, 0x2E, flag(TELUGU) },
- /* devanagari, gujarati vowel sign candra O */
- { 0x3E, 0x45, -1, 0x49, flag(DEVANAGARI) | flag(GUJARATI) },
- /* devanagari vowel sign short O */
- { 0x3E, 0x46, -1, 0x4A, flag(DEVANAGARI) },
- /* devanagari, gujarati vowel sign O */
- { 0x3E, 0x47, -1, 0x4B, flag(DEVANAGARI) | flag(GUJARATI) },
- /* devanagari, gujarati vowel sign AU */
- { 0x3E, 0x48, -1, 0x4C, flag(DEVANAGARI) | flag(GUJARATI) },
- /* kannada vowel sign II */
- { 0x3F, 0x55, -1, 0x40, flag(KANNADA) },
- /* gurmukhi vowel sign UU (when stacking) */
- { 0x41, 0x41, -1, 0x42, flag(GURMUKHI) },
- /* tamil, malayalam vowel sign O */
- { 0x46, 0x3E, -1, 0x4A, flag(TAMIL) | flag(MALAYALAM) },
- /* kannada vowel sign OO */
- { 0x46, 0x42, 0x55, 0x4B, flag(KANNADA) },
- /* kannada vowel sign O */
- { 0x46, 0x42, -1, 0x4A, flag(KANNADA) },
- /* malayalam vowel sign AI (if reordered twice) */
- { 0x46, 0x46, -1, 0x48, flag(MALAYALAM) },
- /* telugu, kannada vowel sign EE */
- { 0x46, 0x55, -1, 0x47, flag(TELUGU) | flag(KANNADA) },
- /* telugu, kannada vowel sign AI */
- { 0x46, 0x56, -1, 0x48, flag(TELUGU) | flag(KANNADA) },
- /* tamil, malayalam vowel sign AU */
- { 0x46, 0x57, -1, 0x4C, flag(TAMIL) | flag(MALAYALAM) },
- /* bengali, oriya vowel sign O, tamil, malayalam vowel sign OO */
- { 0x47, 0x3E, -1, 0x4B, flag(BENGALI) | flag(ORIYA) | flag(TAMIL) | flag(MALAYALAM) },
- /* bengali, oriya vowel sign AU */
- { 0x47, 0x57, -1, 0x4C, flag(BENGALI) | flag(ORIYA) },
- /* kannada vowel sign OO */
- { 0x4A, 0x55, -1, 0x4B, flag(KANNADA) },
- /* gurmukhi letter I */
- { 0x72, 0x3F, -1, 0x07, flag(GURMUKHI) },
- /* gurmukhi letter II */
- { 0x72, 0x40, -1, 0x08, flag(GURMUKHI) },
- /* gurmukhi letter EE */
- { 0x72, 0x47, -1, 0x0F, flag(GURMUKHI) },
- /* gurmukhi letter U */
- { 0x73, 0x41, -1, 0x09, flag(GURMUKHI) },
- /* gurmukhi letter UU */
- { 0x73, 0x42, -1, 0x0A, flag(GURMUKHI) },
- /* gurmukhi letter OO */
- { 0x73, 0x4B, -1, 0x13, flag(GURMUKHI) },
- };
-
- static {
- for (ScriptData sd : scripts.values()) {
- sd.decompMask = new BitSet(0x7F);
- for (int i = 0; i < decompositions.length; i++) {
- final int ch = decompositions[i][0];
- final int flags = decompositions[i][4];
- if ((flags & sd.flag) != 0)
- sd.decompMask.set(ch);
- }
- }
- }
-
- /**
- * Normalizes input text, and returns the new length.
- * The length will always be less than or equal to the existing length.
- *
- * @param text input text
- * @param len valid length
- * @return normalized length
- */
- public int normalize(char text[], int len) {
- for (int i = 0; i < len; i++) {
- final Character.UnicodeBlock block = Character.UnicodeBlock.of(text[i]);
- final ScriptData sd = scripts.get(block);
- if (sd != null) {
- final int ch = text[i] - sd.base;
- if (sd.decompMask.get(ch))
- len = compose(ch, block, sd, text, i, len);
- }
- }
- return len;
- }
-
- /**
- * Compose into standard form any compositions in the decompositions table.
- */
- private int compose(int ch0, Character.UnicodeBlock block0, ScriptData sd,
- char text[], int pos, int len) {
- if (pos + 1 >= len) /* need at least 2 chars! */
- return len;
-
- final int ch1 = text[pos + 1] - sd.base;
- final Character.UnicodeBlock block1 = Character.UnicodeBlock.of(text[pos + 1]);
- if (block1 != block0) /* needs to be the same writing system */
- return len;
-
- int ch2 = -1;
-
- if (pos + 2 < len) {
- ch2 = text[pos + 2] - sd.base;
- Character.UnicodeBlock block2 = Character.UnicodeBlock.of(text[pos + 2]);
- if (text[pos + 2] == '\u200D') // ZWJ
- ch2 = 0xFF;
- else if (block2 != block1) // still allow a 2-char match
- ch2 = -1;
- }
-
- for (int i = 0; i < decompositions.length; i++)
- if (decompositions[i][0] == ch0 && (decompositions[i][4] & sd.flag) != 0) {
- if (decompositions[i][1] == ch1 && (decompositions[i][2] < 0 || decompositions[i][2] == ch2)) {
- text[pos] = (char) (sd.base + decompositions[i][3]);
- len = delete(text, pos + 1, len);
- if (decompositions[i][2] >= 0)
- len = delete(text, pos + 1, len);
- return len;
- }
- }
-
- return len;
- }
-}
fnp / pylucene.git / blobdiff