| /* LineBreakIterator.java - Default word BreakIterator. |
| Copyright (C) 1999, 2001, 2004 Free Software Foundation, Inc. |
| |
| This file is part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2, or (at your option) |
| any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; see the file COPYING. If not, write to the |
| Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA |
| 02110-1301 USA. |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.java.text; |
| |
| import java.text.CharacterIterator; |
| |
| /** |
| * @author Tom Tromey <tromey@cygnus.com> |
| * @date March 22, 1999 |
| * Written using The Unicode Standard, Version 2.0. |
| */ |
| |
| public class LineBreakIterator extends BaseBreakIterator |
| { |
| public Object clone () |
| { |
| return new LineBreakIterator (this); |
| } |
| |
| public LineBreakIterator () |
| { |
| } |
| |
| private LineBreakIterator (LineBreakIterator other) |
| { |
| iter = (CharacterIterator) other.iter.clone(); |
| } |
| |
| // Some methods to tell us different properties of characters. |
| private final boolean isNb (char c) |
| { |
| return (c == 0x00a0 // NO-BREAK SPACE |
| || c == 0x2011 // NON-BREAKING HYPHEN |
| || c == 0xfeff); // ZERO WITH NO-BREAK SPACE |
| } |
| private final boolean isClose (int type) |
| { |
| return (type == Character.END_PUNCTUATION |
| // Unicode book says "comma, period, ...", which I take to |
| // mean "Po" class. |
| || type == Character.OTHER_PUNCTUATION); |
| } |
| private final boolean isIdeo (char c) |
| { |
| return (c >= 0x3040 && c <= 0x309f // Hiragana |
| || c >= 0x30a0 && c <= 0x30ff // Katakana |
| || c >= 0x4e00 && c <= 0x9fff // Han |
| || c >= 0x3100 && c <= 0x312f); // Bopomofo |
| } |
| |
| public int next () |
| { |
| int end = iter.getEndIndex(); |
| if (iter.getIndex() == end) |
| return DONE; |
| |
| while (iter.getIndex() < end) |
| { |
| char c = iter.current(); |
| int type = Character.getType(c); |
| |
| char n = iter.next(); |
| |
| if (n == CharacterIterator.DONE |
| || type == Character.PARAGRAPH_SEPARATOR |
| || type == Character.LINE_SEPARATOR) |
| break; |
| |
| // Handle two cases where we must scan for non-spacing marks. |
| int start = iter.getIndex(); |
| if (type == Character.SPACE_SEPARATOR |
| || type == Character.START_PUNCTUATION |
| || isIdeo (c)) |
| { |
| while (n != CharacterIterator.DONE |
| && Character.getType(n) == Character.NON_SPACING_MARK) |
| n = iter.next(); |
| if (n == CharacterIterator.DONE) |
| break; |
| |
| if (type == Character.SPACE_SEPARATOR) |
| { |
| int nt = Character.getType(n); |
| if (nt != Character.NON_SPACING_MARK |
| && nt != Character.SPACE_SEPARATOR |
| && ! isNb (n)) |
| break; |
| } |
| else if (type == Character.START_PUNCTUATION) |
| { |
| if (isIdeo (n)) |
| { |
| // Open punctuation followed by non spacing marks |
| // and then ideograph does not have a break in |
| // it. So skip all this. |
| start = iter.getIndex(); |
| } |
| } |
| else |
| { |
| // Ideograph preceded this character. |
| if (isClose (Character.getType(n))) |
| break; |
| } |
| } |
| iter.setIndex(start); |
| } |
| |
| return iter.getIndex(); |
| } |
| |
| public int previous () |
| { |
| int start = iter.getBeginIndex(); |
| if (iter.getIndex() == start) |
| return DONE; |
| |
| while (iter.getIndex() >= start) |
| { |
| char c = iter.previous(); |
| if (c == CharacterIterator.DONE) |
| break; |
| int type = Character.getType(c); |
| |
| char n = iter.previous(); |
| if (n == CharacterIterator.DONE) |
| break; |
| iter.next(); |
| |
| int nt = Character.getType(n); |
| // Break after paragraph separators. |
| if (nt == Character.PARAGRAPH_SEPARATOR |
| || nt == Character.LINE_SEPARATOR) |
| break; |
| |
| // Skip non-spacing marks. |
| int init = iter.getIndex(); |
| while (n != CharacterIterator.DONE && nt == Character.NON_SPACING_MARK) |
| { |
| n = iter.previous(); |
| nt = Character.getType(n); |
| } |
| |
| if (nt == Character.SPACE_SEPARATOR |
| && type != Character.SPACE_SEPARATOR |
| && type != Character.NON_SPACING_MARK |
| && ! isNb (c)) |
| break; |
| if (! isClose (type) && isIdeo (n)) |
| break; |
| if (isIdeo (c) && nt != Character.START_PUNCTUATION) |
| break; |
| iter.setIndex(init); |
| } |
| |
| return iter.getIndex(); |
| } |
| } |