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With inspiration from other libraries
// © 2016 and later: Unicode, Inc. and others.
// License & terms of use: http://www.unicode.org/copyright.html#License
/*
*******************************************************************************
*
* Copyright (C) 2004-2015, International Business Machines
* Corporation and others. All Rights Reserved.
*
*******************************************************************************
* file name: UBiDiProps.java
* encoding: US-ASCII
* tab size: 8 (not used)
* indentation:4
*
* created on: 2005jan16
* created by: Markus W. Scherer
*
* Low-level Unicode bidi/shaping properties access.
* Java port of ubidi_props.h/.c.
*/
package com.ibm.icu.impl;
import java.io.IOException;
import java.nio.ByteBuffer;
import java.util.Iterator;
import com.ibm.icu.lang.UCharacter;
import com.ibm.icu.lang.UProperty;
import com.ibm.icu.text.UnicodeSet;
import com.ibm.icu.util.ICUUncheckedIOException;
public final class UBiDiProps {
// constructors etc. --------------------------------------------------- ***
// port of ubidi_openProps()
private UBiDiProps() throws IOException{
ByteBuffer bytes=ICUBinary.getData(DATA_FILE_NAME);
readData(bytes);
}
private void readData(ByteBuffer bytes) throws IOException {
// read the header
ICUBinary.readHeader(bytes, FMT, new IsAcceptable());
// read indexes[]
int i, count;
count=bytes.getInt();
if(countexpectedTrieLength) {
throw new IOException(DATA_FILE_NAME+": not enough bytes for the trie");
}
// skip padding after trie bytes
ICUBinary.skipBytes(bytes, expectedTrieLength-trieLength);
// read mirrors[]
count=indexes[IX_MIRROR_LENGTH];
if(count>0) {
mirrors=ICUBinary.getInts(bytes, count, 0);
}
// read jgArray[]
count=indexes[IX_JG_LIMIT]-indexes[IX_JG_START];
jgArray=new byte[count];
bytes.get(jgArray);
// read jgArray2[]
count=indexes[IX_JG_LIMIT2]-indexes[IX_JG_START2];
jgArray2=new byte[count];
bytes.get(jgArray2);
}
// implement ICUBinary.Authenticate
private final static class IsAcceptable implements ICUBinary.Authenticate {
@Override
public boolean isDataVersionAcceptable(byte version[]) {
return version[0]==2;
}
}
// set of property starts for UnicodeSet ------------------------------- ***
public final void addPropertyStarts(UnicodeSet set) {
int i, length;
int c, start, limit;
byte prev, jg;
/* add the start code point of each same-value range of the trie */
Iterator trieIterator=trie.iterator();
Trie2.Range range;
while(trieIterator.hasNext() && !(range=trieIterator.next()).leadSurrogate) {
set.add(range.startCodePoint);
}
/* add the code points from the bidi mirroring table */
length=indexes[IX_MIRROR_LENGTH];
for(i=0; i>MAX_JG_SHIFT;
case UProperty.JOINING_TYPE:
return (max&JT_MASK)>>JT_SHIFT;
case UProperty.BIDI_PAIRED_BRACKET_TYPE:
return (max&BPT_MASK)>>BPT_SHIFT;
default:
return -1; /* undefined */
}
}
public final int getClass(int c) {
return getClassFromProps(trie.get(c));
}
public final boolean isMirrored(int c) {
return getFlagFromProps(trie.get(c), IS_MIRRORED_SHIFT);
}
private final int getMirror(int c, int props) {
int delta=getMirrorDeltaFromProps(props);
if(delta!=ESC_MIRROR_DELTA) {
return c+delta;
} else {
/* look for mirror code point in the mirrors[] table */
int m;
int i, length;
int c2;
length=indexes[IX_MIRROR_LENGTH];
/* linear search */
for(i=0; i>JT_SHIFT;
}
public final int getJoiningGroup(int c) {
int start, limit;
start=indexes[IX_JG_START];
limit=indexes[IX_JG_LIMIT];
if(start<=c && c>BPT_SHIFT;
}
public final int getPairedBracket(int c) {
int props=trie.get(c);
if((props&BPT_MASK)==0) {
return c;
} else {
return getMirror(c, props);
}
}
// data members -------------------------------------------------------- ***
private int indexes[];
private int mirrors[];
private byte jgArray[];
private byte jgArray2[];
private Trie2_16 trie;
// data format constants ----------------------------------------------- ***
private static final String DATA_NAME="ubidi";
private static final String DATA_TYPE="icu";
private static final String DATA_FILE_NAME=DATA_NAME+"."+DATA_TYPE;
/* format "BiDi" */
private static final int FMT=0x42694469;
/* indexes into indexes[] */
//private static final int IX_INDEX_TOP=0;
//private static final int IX_LENGTH=1;
private static final int IX_TRIE_SIZE=2;
private static final int IX_MIRROR_LENGTH=3;
private static final int IX_JG_START=4;
private static final int IX_JG_LIMIT=5;
private static final int IX_JG_START2=6; /* new in format version 2.2, ICU 54 */
private static final int IX_JG_LIMIT2=7;
private static final int IX_MAX_VALUES=15;
private static final int IX_TOP=16;
// definitions for 16-bit bidi/shaping properties word ----------------- ***
/* CLASS_SHIFT=0, */ /* bidi class: 5 bits (4..0) */
private static final int JT_SHIFT=5; /* joining type: 3 bits (7..5) */
private static final int BPT_SHIFT=8; /* Bidi_Paired_Bracket_Type(bpt): 2 bits (9..8) */
private static final int JOIN_CONTROL_SHIFT=10;
private static final int BIDI_CONTROL_SHIFT=11;
private static final int IS_MIRRORED_SHIFT=12; /* 'is mirrored' */
private static final int MIRROR_DELTA_SHIFT=13; /* bidi mirroring delta: 3 bits (15..13) */
private static final int MAX_JG_SHIFT=16; /* max JG value in indexes[MAX_VALUES_INDEX] bits 23..16 */
private static final int CLASS_MASK= 0x0000001f;
private static final int JT_MASK= 0x000000e0;
private static final int BPT_MASK= 0x00000300;
private static final int MAX_JG_MASK= 0x00ff0000;
private static final int getClassFromProps(int props) {
return props&CLASS_MASK;
}
private static final boolean getFlagFromProps(int props, int shift) {
return ((props>>shift)&1)!=0;
}
private static final int getMirrorDeltaFromProps(int props) {
return (short)props>>MIRROR_DELTA_SHIFT;
}
private static final int ESC_MIRROR_DELTA=-4;
//private static final int MIN_MIRROR_DELTA=-3;
//private static final int MAX_MIRROR_DELTA=3;
// definitions for 32-bit mirror table entry --------------------------- ***
/* the source Unicode code point takes 21 bits (20..0) */
private static final int MIRROR_INDEX_SHIFT=21;
//private static final int MAX_MIRROR_INDEX=0x7ff;
private static final int getMirrorCodePoint(int m) {
return m&0x1fffff;
}
private static final int getMirrorIndex(int m) {
return m>>>MIRROR_INDEX_SHIFT;
}
/*
* public singleton instance
*/
public static final UBiDiProps INSTANCE;
// This static initializer block must be placed after
// other static member initialization
static {
try {
INSTANCE = new UBiDiProps();
} catch (IOException e) {
throw new ICUUncheckedIOException(e);
}
}
}