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255 lines
7.0 KiB
Java
255 lines
7.0 KiB
Java
/* SentenceBreakIterator.java - Default sentence BreakIterator.
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Copyright (C) 1999, 2001 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
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02111-1307 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.text;
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import java.text.BreakIterator;
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import java.text.CharacterIterator;
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/**
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* @author Tom Tromey <tromey@cygnus.com>
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* @date March 23, 1999
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* Written using The Unicode Standard, Version 2.0.
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*/
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public class SentenceBreakIterator extends BaseBreakIterator
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{
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public Object clone ()
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{
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return new SentenceBreakIterator (this);
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}
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public SentenceBreakIterator ()
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{
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iter = null;
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}
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private SentenceBreakIterator (SentenceBreakIterator other)
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{
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iter = (CharacterIterator) other.iter.clone();
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}
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public int next ()
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{
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int end = iter.getEndIndex();
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if (iter.getIndex() == end)
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return DONE;
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while (iter.getIndex() < end)
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{
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char c = iter.current();
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if (c == CharacterIterator.DONE)
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break;
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int type = Character.getType(c);
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char n = iter.next();
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if (n == CharacterIterator.DONE)
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break;
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// Always break after paragraph separator.
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if (type == Character.PARAGRAPH_SEPARATOR)
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break;
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if (c == '!' || c == '?')
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{
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// Skip close punctuation.
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.END_PUNCTUATION)
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n = iter.next();
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// Skip spaces.
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.SPACE_SEPARATOR)
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n = iter.next();
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// Skip optional paragraph separator.
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if (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.PARAGRAPH_SEPARATOR)
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n = iter.next();
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// There's always a break somewhere after `!' or `?'.
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break;
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}
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if (c == '.')
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{
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int save = iter.getIndex();
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// Skip close punctuation.
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.END_PUNCTUATION)
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n = iter.next();
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// Skip spaces. We keep count because we need at least
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// one for this period to represent a terminator.
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int spcount = 0;
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.SPACE_SEPARATOR)
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{
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n = iter.next();
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++spcount;
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}
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if (spcount > 0)
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{
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int save2 = iter.getIndex();
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// Skip over open puncutation.
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.START_PUNCTUATION)
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n = iter.next();
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// Next character must not be lower case.
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if (n == CharacterIterator.DONE
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|| ! Character.isLowerCase(n))
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{
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iter.setIndex(save2);
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break;
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}
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}
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iter.setIndex(save);
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}
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}
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return iter.getIndex();
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}
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private final int previous_internal ()
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{
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int start = iter.getBeginIndex();
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if (iter.getIndex() == start)
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return DONE;
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while (iter.getIndex() >= start)
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{
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char c = iter.previous();
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if (c == CharacterIterator.DONE)
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break;
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char n = iter.previous();
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if (n == CharacterIterator.DONE)
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break;
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iter.next();
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int nt = Character.getType(n);
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if (! Character.isLowerCase(c)
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&& (nt == Character.START_PUNCTUATION
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|| nt == Character.SPACE_SEPARATOR))
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{
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int save = iter.getIndex();
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int save_nt = nt;
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char save_n = n;
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// Skip open punctuation.
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.START_PUNCTUATION)
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n = iter.previous();
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if (n == CharacterIterator.DONE)
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break;
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if (Character.getType(n) == Character.SPACE_SEPARATOR)
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{
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// Must have at least once space after the `.'.
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int save2 = iter.getIndex();
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.SPACE_SEPARATOR)
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n = iter.previous();
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// Skip close punctuation.
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.END_PUNCTUATION)
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n = iter.previous();
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if (n == CharacterIterator.DONE || n == '.')
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{
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// Communicate location of actual end.
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period = iter.getIndex();
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iter.setIndex(save2);
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break;
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}
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}
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iter.setIndex(save);
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nt = save_nt;
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n = save_n;
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}
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if (nt == Character.PARAGRAPH_SEPARATOR)
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{
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// Communicate location of actual end.
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period = iter.getIndex();
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break;
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}
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else if (nt == Character.SPACE_SEPARATOR
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|| nt == Character.END_PUNCTUATION)
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{
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int save = iter.getIndex();
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// Skip spaces.
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.SPACE_SEPARATOR)
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n = iter.previous();
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// Skip close punctuation.
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.END_PUNCTUATION)
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n = iter.previous();
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int here = iter.getIndex();
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iter.setIndex(save);
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if (n == CharacterIterator.DONE || n == '!' || n == '?')
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{
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// Communicate location of actual end.
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period = here;
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break;
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}
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}
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else if (n == '!' || n == '?')
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{
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// Communicate location of actual end.
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period = iter.getIndex();
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break;
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}
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}
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return iter.getIndex();
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}
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public int previous ()
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{
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// We want to skip over the first sentence end to the second one.
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// However, at the end of the string we want the first end.
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int here = iter.getIndex();
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period = here;
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int first = previous_internal ();
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if (here == iter.getEndIndex() || first == DONE)
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return first;
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iter.setIndex(period);
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return previous_internal ();
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}
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// This is used for communication between previous and
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// previous_internal.
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private int period;
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}
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