| /* SentenceBreakIterator.java - Default sentence BreakIterator. |
| Copyright (C) 1999, 2001, 2002, 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 23, 1999 |
| * Written using The Unicode Standard, Version 2.0. |
| */ |
| |
| public class SentenceBreakIterator extends BaseBreakIterator |
| { |
| public Object clone () |
| { |
| return new SentenceBreakIterator (this); |
| } |
| |
| public SentenceBreakIterator () |
| { |
| } |
| |
| private SentenceBreakIterator (SentenceBreakIterator other) |
| { |
| iter = (CharacterIterator) other.iter.clone(); |
| } |
| |
| public int next () |
| { |
| int end = iter.getEndIndex(); |
| if (iter.getIndex() == end) |
| return DONE; |
| |
| while (iter.getIndex() < end) |
| { |
| char c = iter.current(); |
| if (c == CharacterIterator.DONE) |
| break; |
| int type = Character.getType(c); |
| |
| char n = iter.next(); |
| if (n == CharacterIterator.DONE) |
| break; |
| |
| // Always break after paragraph separator. |
| if (type == Character.PARAGRAPH_SEPARATOR) |
| break; |
| |
| if (c == '!' || c == '?') |
| { |
| // Skip close punctuation. |
| while (n != CharacterIterator.DONE |
| && Character.getType(n) == Character.END_PUNCTUATION) |
| n = iter.next(); |
| // Skip (java) space, line and paragraph separators. |
| while (n != CharacterIterator.DONE && Character.isWhitespace(n)) |
| n = iter.next(); |
| |
| // There's always a break somewhere after `!' or `?'. |
| break; |
| } |
| |
| if (c == '.') |
| { |
| int save = iter.getIndex(); |
| // Skip close punctuation. |
| while (n != CharacterIterator.DONE |
| && Character.getType(n) == Character.END_PUNCTUATION) |
| n = iter.next(); |
| // Skip (java) space, line and paragraph separators. |
| // We keep count because we need at least one for this period to |
| // represent a terminator. |
| int spcount = 0; |
| while (n != CharacterIterator.DONE && Character.isWhitespace(n)) |
| { |
| n = iter.next(); |
| ++spcount; |
| } |
| if (spcount > 0) |
| { |
| int save2 = iter.getIndex(); |
| // Skip over open puncutation. |
| while (n != CharacterIterator.DONE |
| && Character.getType(n) == Character.START_PUNCTUATION) |
| n = iter.next(); |
| // Next character must not be lower case. |
| if (n == CharacterIterator.DONE |
| || ! Character.isLowerCase(n)) |
| { |
| iter.setIndex(save2); |
| break; |
| } |
| } |
| iter.setIndex(save); |
| } |
| } |
| |
| return iter.getIndex(); |
| } |
| |
| private final int previous_internal () |
| { |
| int start = iter.getBeginIndex(); |
| if (iter.getIndex() == start) |
| return DONE; |
| |
| while (iter.getIndex() >= start) |
| { |
| char c = iter.previous(); |
| if (c == CharacterIterator.DONE) |
| break; |
| |
| char n = iter.previous(); |
| if (n == CharacterIterator.DONE) |
| break; |
| iter.next(); |
| int nt = Character.getType(n); |
| |
| if (! Character.isLowerCase(c) |
| && (nt == Character.START_PUNCTUATION |
| || Character.isWhitespace(n))) |
| { |
| int save = iter.getIndex(); |
| int save_nt = nt; |
| char save_n = n; |
| // Skip open punctuation. |
| while (n != CharacterIterator.DONE |
| && Character.getType(n) == Character.START_PUNCTUATION) |
| n = iter.previous(); |
| if (n == CharacterIterator.DONE) |
| break; |
| if (Character.isWhitespace(n)) |
| { |
| // Must have at least one (java) space after the `.'. |
| int save2 = iter.getIndex(); |
| while (n != CharacterIterator.DONE |
| && Character.isWhitespace(n)) |
| n = iter.previous(); |
| // Skip close punctuation. |
| while (n != CharacterIterator.DONE |
| && Character.getType(n) == Character.END_PUNCTUATION) |
| n = iter.previous(); |
| if (n == CharacterIterator.DONE || n == '.') |
| { |
| // Communicate location of actual end. |
| period = iter.getIndex(); |
| iter.setIndex(save2); |
| break; |
| } |
| } |
| iter.setIndex(save); |
| nt = save_nt; |
| n = save_n; |
| } |
| |
| if (nt == Character.PARAGRAPH_SEPARATOR) |
| { |
| // Communicate location of actual end. |
| period = iter.getIndex(); |
| break; |
| } |
| else if (Character.isWhitespace(n) |
| || nt == Character.END_PUNCTUATION) |
| { |
| int save = iter.getIndex(); |
| // Skip (java) space, line and paragraph separators. |
| while (n != CharacterIterator.DONE |
| && Character.isWhitespace(n)) |
| n = iter.previous(); |
| // Skip close punctuation. |
| while (n != CharacterIterator.DONE |
| && Character.getType(n) == Character.END_PUNCTUATION) |
| n = iter.previous(); |
| int here = iter.getIndex(); |
| iter.setIndex(save); |
| if (n == CharacterIterator.DONE || n == '!' || n == '?') |
| { |
| // Communicate location of actual end. |
| period = here; |
| break; |
| } |
| } |
| else if (n == '!' || n == '?') |
| { |
| // Communicate location of actual end. |
| period = iter.getIndex(); |
| break; |
| } |
| } |
| |
| return iter.getIndex(); |
| } |
| |
| public int previous () |
| { |
| // We want to skip over the first sentence end to the second one. |
| // However, at the end of the string we want the first end. |
| int here = iter.getIndex(); |
| period = here; |
| int first = previous_internal (); |
| if (here == iter.getEndIndex() || first == DONE) |
| return first; |
| iter.setIndex(period); |
| return previous_internal (); |
| } |
| |
| // This is used for communication between previous and |
| // previous_internal. |
| private int period; |
| } |