348 lines
13 KiB
Java
348 lines
13 KiB
Java
package com.ibm.text.UCD;
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import java.util.*;
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import com.ibm.text.*;
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import com.ibm.text.utility.*;
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/**
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* Implements Unicode Normalization Forms C, D, KC, KD.<br>
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* See UTR#15 for details.<br>
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* Copyright © 1998-1999 Unicode, Inc. All Rights Reserved.<br>
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* The Unicode Consortium makes no expressed or implied warranty of any
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* kind, and assumes no liability for errors or omissions.
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* No liability is assumed for incidental and consequential damages
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* in connection with or arising out of the use of the information here.
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* @author Mark Davis
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*/
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public class NormalizerSample implements UCD_Types {
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static final String copyright = "Copyright (C) 2001, IBM Corp. and Unicode Inc. All Rights Reserved.";
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public static boolean SHOW_PROGRESS = false;
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/**
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* Create a normalizer for a given form.
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*/
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public NormalizerSample(byte form, String unicodeVersion) {
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this.composition = (form & COMPOSITION_MASK) != 0;
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this.compatibility = (form & COMPATIBILITY_MASK) != 0;
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this.data = getData(unicodeVersion);
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}
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/**
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* Create a normalizer for a given form.
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*/
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public NormalizerSample(byte form) {
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this(form,"");
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}
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/**
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* Masks for the form selector
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*/
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public static final byte
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COMPATIBILITY_MASK = 1,
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COMPOSITION_MASK = 2;
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/**
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* Normalization Form Selector
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*/
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public static final byte
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NFD = 0 ,
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NFKD = COMPATIBILITY_MASK,
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NFC = COMPOSITION_MASK,
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NFKC = (byte)(COMPATIBILITY_MASK + COMPOSITION_MASK);
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/**
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* Normalizes text according to the chosen form,
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* replacing contents of the target buffer.
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* @param source the original text, unnormalized
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* @param target the resulting normalized text
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*/
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public StringBuffer normalize(String source, StringBuffer target) {
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// First decompose the source into target,
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// then compose if the form requires.
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if (source.length() != 0) {
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internalDecompose(source, target);
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if (composition) {
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internalCompose(target);
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}
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}
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return target;
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}
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/**
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* Normalizes text according to the chosen form
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* @param source the original text, unnormalized
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* @return target the resulting normalized text
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*/
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public String normalize(String source) {
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return normalize(source, new StringBuffer()).toString();
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}
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/**
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* Normalizes text according to the chosen form
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* @param source the original text, unnormalized
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* @return target the resulting normalized text
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*/
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public String normalize(int cp) {
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return normalize(UTF16.valueOf(cp));
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}
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/**
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*/
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private StringBuffer hasDecompositionBuffer = new StringBuffer();
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public boolean hasDecomposition(int cp) {
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hasDecompositionBuffer.setLength(0);
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normalize(UTF16.valueOf(cp), hasDecompositionBuffer);
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if (hasDecompositionBuffer.length() != 1) return true;
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return cp != hasDecompositionBuffer.charAt(0);
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}
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/**
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* Utility: Checks whether there is a recursive decomposition of a character from the
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* Unicode Character Database. It is compatibility or canonical according to the particular
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* normalizer.
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* @param ch the source character
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*/
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public boolean normalizationDiffers(int ch) {
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return data.normalizationDiffers(ch, composition, compatibility);
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}
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/**
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* Utility: Gets recursive decomposition of a character from the
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* Unicode Character Database.
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* @param compatibility If false selects the recursive
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* canonical decomposition, otherwise selects
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* the recursive compatibility AND canonical decomposition.
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* @param ch the source character
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* @param buffer buffer to be filled with the decomposition
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*/
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public void getRecursiveDecomposition(char ch, StringBuffer buffer) {
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data.getRecursiveDecomposition(ch, buffer, compatibility);
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}
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// ======================================
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// PRIVATES
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// ======================================
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/**
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* The current form.
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*/
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private boolean composition;
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private boolean compatibility;
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/**
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* Decomposes text, either canonical or compatibility,
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* replacing contents of the target buffer.
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* @param form the normalization form. If COMPATIBILITY_MASK
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* bit is on in this byte, then selects the recursive
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* compatibility decomposition, otherwise selects
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* the recursive canonical decomposition.
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* @param source the original text, unnormalized
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* @param target the resulting normalized text
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*/
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private void internalDecompose(String source, StringBuffer target) {
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StringBuffer buffer = new StringBuffer();
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int ch32;
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for (int i = 0; i < source.length(); i += UTF16.getCharCount(ch32)) {
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buffer.setLength(0);
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ch32 = UTF16.charAt(source, i);
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data.getRecursiveDecomposition(ch32, buffer, compatibility);
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// add all of the characters in the decomposition.
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// (may be just the original character, if there was
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// no decomposition mapping)
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int ch;
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for (int j = 0; j < buffer.length(); j += UTF16.getCharCount(ch)) {
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ch = UTF16.charAt(buffer, j);
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int chClass = data.getCanonicalClass(ch);
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int k = target.length(); // insertion point
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if (chClass != 0) {
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// bubble-sort combining marks as necessary
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int ch2;
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for (; k > 0; k -= UTF16.getCharCount(ch2)) {
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ch2 = UTF16.charAt(target, k-1);
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if (data.getCanonicalClass(ch2) <= chClass) break;
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}
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}
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target.insert(k, UTF16.valueOf(ch));
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}
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}
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}
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/**
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* Composes text in place. Target must already
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* have been decomposed.
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* Uses UTF16, which is a utility class for supplementary character support in Java.
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* @param target input: decomposed text.
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* output: the resulting normalized text.
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*/
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private void internalCompose(StringBuffer target) {
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int starterPos = 0;
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int starterCh = UTF16.charAt(target,0);
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int compPos = UTF16.getCharCount(starterCh); // length of last composition
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int lastClass = data.getCanonicalClass(starterCh);
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if (lastClass != 0) lastClass = 256; // fix for strings staring with a combining mark
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int oldLen = target.length();
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// Loop on the decomposed characters, combining where possible
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int ch;
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for (int decompPos = compPos; decompPos < target.length(); decompPos += UTF16.getCharCount(ch)) {
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ch = UTF16.charAt(target, decompPos);
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if (SHOW_PROGRESS) System.out.println(Utility.hex(target)
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+ ", decompPos: " + decompPos
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+ ", compPos: " + compPos
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+ ", ch: " + Utility.hex(ch)
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);
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int chClass = data.getCanonicalClass(ch);
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int composite = data.getPairwiseComposition(starterCh, ch);
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if (composite != data.NOT_COMPOSITE
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&& (lastClass < chClass || lastClass == 0)) {
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UTF16.setCharAt(target, starterPos, composite);
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// we know that we will only be replacing non-supplementaries by non-supplementaries
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// so we don't have to adjust the decompPos
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starterCh = composite;
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} else {
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if (chClass == 0) {
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starterPos = compPos;
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starterCh = ch;
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}
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lastClass = chClass;
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UTF16.setCharAt(target, compPos, ch);
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if (target.length() != oldLen) { // MAY HAVE TO ADJUST!
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System.out.println("ADJUSTING: " + Utility.hex(target));
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decompPos += target.length() - oldLen;
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oldLen = target.length();
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}
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compPos += UTF16.getCharCount(ch);
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}
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}
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target.setLength(compPos);
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}
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// The following class makes use of the UCD class, which accesses data in the Unicode Character Database
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static class Stub {
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private UCD ucd;
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private HashMap compTable = new HashMap();
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private BitSet isSecond = new BitSet();
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private BitSet canonicalRecompose = new BitSet();
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private BitSet compatibilityRecompose = new BitSet();
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static final int NOT_COMPOSITE = 0xFFFF;
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Stub(String version) {
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ucd = UCD.make(version);
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for (int i = 0; i < 0x10FFFF; ++i) {
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if (!ucd.isAssigned(i)) continue;
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if (ucd.isPUA(i)) continue;
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if (ucd.isTrailingJamo(i)) isSecond.set(i);
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byte dt = ucd.getDecompositionType(i);
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if (dt != CANONICAL) continue;
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if (!ucd.getBinaryProperty(i, CompositionExclusion)) {
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try {
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String s = ucd.getDecompositionMapping(i);
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int len = UTF16.countCodePoint(s);
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if (len != 2) {
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if (len > 2) throw new IllegalArgumentException("BAD LENGTH: " + len + ucd.toString(i));
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continue;
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}
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int a = UTF16.charAt(s, 0);
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if (ucd.getCombiningClass(a) != 0) continue;
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int b = UTF16.charAt(s, UTF16.getCharCount(a));
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isSecond.set(b);
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// have a recomposition, so set the bit
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canonicalRecompose.set(i);
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// set the compatibility recomposition bit
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// ONLY if the component characters
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// don't compatibility decompose
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if (ucd.getDecompositionType(a) <= CANONICAL
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&& ucd.getDecompositionType(b) <= CANONICAL) {
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compatibilityRecompose.set(i);
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}
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long key = (((long)a)<<32) | b;
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compTable.put(new Long(key), new Integer(i));
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} catch (Exception e) {
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throw new ChainException("Error: {0}", new Object[]{ucd.toString(i)}, e);
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}
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}
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}
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}
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short getCanonicalClass(int cp) {
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return ucd.getCombiningClass(cp);
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}
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boolean isTrailing(int cp) {
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return isSecond.get(cp);
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}
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boolean normalizationDiffers(int cp, boolean composition, boolean compatibility) {
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byte dt = ucd.getDecompositionType(cp);
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if (!composition) {
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if (compatibility) return dt >= CANONICAL;
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else return dt == CANONICAL;
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} else {
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// almost the same, except that we add back in the characters
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// that RECOMPOSE
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if (compatibility) return dt >= CANONICAL && !compatibilityRecompose.get(cp);
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else return dt == CANONICAL && !canonicalRecompose.get(cp);
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}
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}
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public void getRecursiveDecomposition(int cp, StringBuffer buffer, boolean compatibility) {
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byte dt = ucd.getDecompositionType(cp);
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// we know we decompose all CANONICAL, plus > CANONICAL if compatibility is TRUE.
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if (dt == CANONICAL || dt > CANONICAL && compatibility) {
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String s = ucd.getDecompositionMapping(cp);
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for (int i = 0; i < s.length(); i += UTF16.getCharCount(cp)) {
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cp = UTF16.charAt(s, i);
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getRecursiveDecomposition(cp, buffer, compatibility);
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}
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} else {
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UTF16.append(buffer, cp);
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}
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}
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int getPairwiseComposition(int starterCh, int ch) {
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int hangulPoss = UCD.composeHangul(starterCh, ch);
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if (hangulPoss != 0xFFFF) return hangulPoss;
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Object obj = compTable.get(new Long((((long)starterCh)<<32) | ch));
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if (obj == null) return 0xFFFF;
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return ((Integer)obj).intValue();
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}
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}
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/**
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* Contains normalization data from the Unicode Character Database.
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* use false for the minimal set, true for the real set.
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*/
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private Stub data;
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private static HashMap versionCache = new HashMap();
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private static Stub getData (String version) {
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if (version.length() == 0) version = UCD.latestVersion;
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Stub result = (Stub)versionCache.get(version);
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if (result == null) {
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result = new Stub(version);
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versionCache.put(version, result);
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}
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return result;
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}
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} |