1 /* LineBreakIterator.java - Default word BreakIterator. 2 Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc. 3 4 This file is part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2, or (at your option) 9 any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; see the file COPYING. If not, write to the 18 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 19 02110-1301 USA. 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package gnu.java.text; 40 41 import java.text.CharacterIterator; 42 43 /** 44 * @author Tom Tromey <tromey@cygnus.com> 45 * @date March 22, 1999 46 * Written using The Unicode Standard, Version 2.0. 47 */ 48 49 public class LineBreakIterator extends BaseBreakIterator 50 { clone()51 public Object clone () 52 { 53 return new LineBreakIterator (this); 54 } 55 LineBreakIterator()56 public LineBreakIterator () 57 { 58 } 59 LineBreakIterator(LineBreakIterator other)60 private LineBreakIterator (LineBreakIterator other) 61 { 62 iter = (CharacterIterator) other.iter.clone(); 63 } 64 65 // Some methods to tell us different properties of characters. isNb(char c)66 private final boolean isNb (char c) 67 { 68 return (c == 0x00a0 // NO-BREAK SPACE 69 || c == 0x2011 // NON-BREAKING HYPHEN 70 || c == 0xfeff); // ZERO WITH NO-BREAK SPACE 71 } isClose(int type)72 private final boolean isClose (int type) 73 { 74 return (type == Character.END_PUNCTUATION 75 // Unicode book says "comma, period, ...", which I take to 76 // mean "Po" class. 77 || type == Character.OTHER_PUNCTUATION); 78 } isIdeo(char c)79 private final boolean isIdeo (char c) 80 { 81 return (c >= 0x3040 && c <= 0x309f // Hiragana 82 || c >= 0x30a0 && c <= 0x30ff // Katakana 83 || c >= 0x4e00 && c <= 0x9fff // Han 84 || c >= 0x3100 && c <= 0x312f); // Bopomofo 85 } 86 next()87 public int next () 88 { 89 int end = iter.getEndIndex(); 90 if (iter.getIndex() == end) 91 return DONE; 92 93 while (iter.getIndex() < end) 94 { 95 char c = iter.current(); 96 int type = Character.getType(c); 97 98 char n = iter.next(); 99 100 if (n == CharacterIterator.DONE 101 || type == Character.PARAGRAPH_SEPARATOR 102 || type == Character.LINE_SEPARATOR) 103 break; 104 105 // Handle two cases where we must scan for non-spacing marks. 106 int start = iter.getIndex(); 107 if (type == Character.SPACE_SEPARATOR 108 || type == Character.START_PUNCTUATION 109 || isIdeo (c)) 110 { 111 while (n != CharacterIterator.DONE 112 && Character.getType(n) == Character.NON_SPACING_MARK) 113 n = iter.next(); 114 if (n == CharacterIterator.DONE) 115 break; 116 117 if (type == Character.SPACE_SEPARATOR) 118 { 119 int nt = Character.getType(n); 120 if (nt != Character.NON_SPACING_MARK 121 && nt != Character.SPACE_SEPARATOR 122 && ! isNb (n)) 123 break; 124 } 125 else if (type == Character.START_PUNCTUATION) 126 { 127 if (isIdeo (n)) 128 { 129 // Open punctuation followed by non spacing marks 130 // and then ideograph does not have a break in 131 // it. So skip all this. 132 start = iter.getIndex(); 133 } 134 } 135 else 136 { 137 // Ideograph preceded this character. 138 if (isClose (Character.getType(n))) 139 break; 140 } 141 } 142 iter.setIndex(start); 143 } 144 145 return iter.getIndex(); 146 } 147 previous()148 public int previous () 149 { 150 int start = iter.getBeginIndex(); 151 if (iter.getIndex() == start) 152 return DONE; 153 154 while (iter.getIndex() >= start) 155 { 156 char c = iter.previous(); 157 if (c == CharacterIterator.DONE) 158 break; 159 int type = Character.getType(c); 160 161 char n = iter.previous(); 162 if (n == CharacterIterator.DONE) 163 break; 164 iter.next(); 165 166 int nt = Character.getType(n); 167 // Break after paragraph separators. 168 if (nt == Character.PARAGRAPH_SEPARATOR 169 || nt == Character.LINE_SEPARATOR) 170 break; 171 172 // Skip non-spacing marks. 173 int init = iter.getIndex(); 174 while (n != CharacterIterator.DONE && nt == Character.NON_SPACING_MARK) 175 { 176 n = iter.previous(); 177 nt = Character.getType(n); 178 } 179 180 if (nt == Character.SPACE_SEPARATOR 181 && type != Character.SPACE_SEPARATOR 182 && type != Character.NON_SPACING_MARK 183 && ! isNb (c)) 184 break; 185 if (! isClose (type) && isIdeo (n)) 186 break; 187 if (isIdeo (c) && nt != Character.START_PUNCTUATION) 188 break; 189 iter.setIndex(init); 190 } 191 192 return iter.getIndex(); 193 } 194 } 195