227 lines
5.5 KiB
Java
227 lines
5.5 KiB
Java
// Default sentence BreakIterator.
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/* Copyright (C) 1999 Free Software Foundation
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This file is part of libgcj.
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This software is copyrighted work licensed under the terms of the
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Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
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details. */
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package gnu.gcj.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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