/*
* Copyright (c) 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
/*
* (C) Copyright IBM Corp. 2003 - All Rights Reserved
*
* The original version of this source code and documentation is
* copyrighted and owned by IBM. These materials are provided
* under terms of a License Agreement between IBM and Sun.
* This technology is protected by multiple US and International
* patents. This notice and attribution to IBM may not be removed.
*/
package sun.font;
import java.text.CharacterIterator;
public abstract class CodePointIterator {
public static final int DONE = -1;
public abstract void setToStart();
public abstract void setToLimit();
public abstract int next();
public abstract int prev();
public abstract int charIndex();
public static CodePointIterator create(char[] text) {
return new CharArrayCodePointIterator(text);
}
public static CodePointIterator create(char[] text, int start, int limit) {
return new CharArrayCodePointIterator(text, start, limit);
}
public static CodePointIterator create(CharSequence text) {
return new CharSequenceCodePointIterator(text);
}
public static CodePointIterator create(CharacterIterator iter) {
return new CharacterIteratorCodePointIterator(iter);
}
}
final class CharArrayCodePointIterator extends CodePointIterator {
private char[] text;
private int start;
private int limit;
private int index;
public CharArrayCodePointIterator(char[] text) {
this.text = text;
this.limit = text.length;
}
public CharArrayCodePointIterator(char[] text, int start, int limit) {
if (start < 0 || limit < start || limit > text.length) {
throw new IllegalArgumentException();
}
this.text = text;
this.start = this.index = start;
this.limit = limit;
}
public void setToStart() {
index = start;
}
public void setToLimit() {
index = limit;
}
public int next() {
if (index < limit) {
char cp1 = text[index++];
if (Character.isHighSurrogate(cp1) && index < limit) {
char cp2 = text[index];
if (Character.isLowSurrogate(cp2)) {
++index;
return Character.toCodePoint(cp1, cp2);
}
}
return cp1;
}
return DONE;
}
public int prev() {
if (index > start) {
char cp2 = text[--index];
if (Character.isLowSurrogate(cp2) && index > start) {
char cp1 = text[index - 1];
if (Character.isHighSurrogate(cp1)) {
--index;
return Character.toCodePoint(cp1, cp2);
}
}
return cp2;
}
return DONE;
}
public int charIndex() {
return index;
}
}
final class CharSequenceCodePointIterator extends CodePointIterator {
private CharSequence text;
private int index;
public CharSequenceCodePointIterator(CharSequence text) {
this.text = text;
}
public void setToStart() {
index = 0;
}
public void setToLimit() {
index = text.length();
}
public int next() {
if (index < text.length()) {
char cp1 = text.charAt(index++);
if (Character.isHighSurrogate(cp1) && index < text.length()) {
char cp2 = text.charAt(index+1);
if (Character.isLowSurrogate(cp2)) {
++index;
return Character.toCodePoint(cp1, cp2);
}
}
return cp1;
}
return DONE;
}
public int prev() {
if (index > 0) {
char cp2 = text.charAt(--index);
if (Character.isLowSurrogate(cp2) && index > 0) {
char cp1 = text.charAt(index - 1);
if (Character.isHighSurrogate(cp1)) {
--index;
return Character.toCodePoint(cp1, cp2);
}
}
return cp2;
}
return DONE;
}
public int charIndex() {
return index;
}
}
// note this has different iteration semantics than CharacterIterator
final class CharacterIteratorCodePointIterator extends CodePointIterator {
private CharacterIterator iter;
public CharacterIteratorCodePointIterator(CharacterIterator iter) {
this.iter = iter;
}
public void setToStart() {
iter.setIndex(iter.getBeginIndex());
}
public void setToLimit() {
iter.setIndex(iter.getEndIndex());
}
public int next() {
char cp1 = iter.current();
if (cp1 != CharacterIterator.DONE) {
char cp2 = iter.next();
if (Character.isHighSurrogate(cp1) && cp2 != CharacterIterator.DONE) {
if (Character.isLowSurrogate(cp2)) {
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