120 lines
3.5 KiB
Java
120 lines
3.5 KiB
Java
/*
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* Copyright (c) 2006, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package javax.swing.text;
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import java.text.BreakIterator;
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import java.text.CharacterIterator;
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import java.text.StringCharacterIterator;
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import java.util.Arrays;
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/**
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* A simple whitespace-based BreakIterator implementation.
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*
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* @author Sergey Groznyh
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*/
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class WhitespaceBasedBreakIterator extends BreakIterator {
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private char[] text = new char[0];
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private int[] breaks = new int[] { 0 } ;
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private int pos = 0;
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/**
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* Calculate break positions eagerly parallel to reading text.
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*/
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public void setText(CharacterIterator ci) {
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int begin = ci.getBeginIndex();
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text = new char[ci.getEndIndex() - begin];
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int[] breaks0 = new int[text.length + 1];
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int brIx = 0;
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breaks0[brIx++] = begin;
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int charIx = 0;
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boolean inWs = false;
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for (char c = ci.first(); c != CharacterIterator.DONE; c = ci.next()) {
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text[charIx] = c;
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boolean ws = Character.isWhitespace(c);
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if (inWs && !ws) {
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breaks0[brIx++] = charIx + begin;
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}
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inWs = ws;
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charIx++;
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}
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if (text.length > 0) {
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breaks0[brIx++] = text.length + begin;
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}
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System.arraycopy(breaks0, 0, breaks = new int[brIx], 0, brIx);
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}
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public CharacterIterator getText() {
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return new StringCharacterIterator(new String(text));
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}
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public int first() {
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return breaks[pos = 0];
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}
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public int last() {
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return breaks[pos = breaks.length - 1];
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}
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public int current() {
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return breaks[pos];
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}
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public int next() {
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return (pos == breaks.length - 1 ? DONE : breaks[++pos]);
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}
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public int previous() {
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return (pos == 0 ? DONE : breaks[--pos]);
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}
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public int next(int n) {
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return checkhit(pos + n);
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}
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public int following(int n) {
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return adjacent(n, 1);
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}
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public int preceding(int n) {
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return adjacent(n, -1);
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}
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private int checkhit(int hit) {
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if ((hit < 0) || (hit >= breaks.length)) {
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return DONE;
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} else {
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return breaks[pos = hit];
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}
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}
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private int adjacent(int n, int bias) {
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int hit = Arrays.binarySearch(breaks, n);
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int offset = (hit < 0 ? (bias < 0 ? -1 : -2) : 0);
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return checkhit(Math.abs(hit) + bias + offset);
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}
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}
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