253 lines
7.5 KiB
Java
253 lines
7.5 KiB
Java
/* WordBreakIterator.java - Default word 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 22, 1999
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* Written using The Unicode Standard, Version 2.0.
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*/
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public class WordBreakIterator extends BaseBreakIterator
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{
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public Object clone ()
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{
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return new WordBreakIterator (this);
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}
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public WordBreakIterator ()
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{
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iter = null;
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}
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private WordBreakIterator (WordBreakIterator other)
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{
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iter = (CharacterIterator) other.iter.clone();
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}
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// Some methods to tell us different properties of characters.
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private final boolean isHira (char c)
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{
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return c >= 0x3040 && c <= 0x309f;
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}
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private final boolean isKata (char c)
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{
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return c >= 0x30a0 && c <= 0x30ff;
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}
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private final boolean isHan (char c)
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{
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return c >= 0x4e00 && c <= 0x9fff;
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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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// Break after paragraph separators.
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if (type == Character.PARAGRAPH_SEPARATOR
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|| type == Character.LINE_SEPARATOR)
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break;
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// Break between letters and non-letters.
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// FIXME: we treat apostrophe as part of a word. This
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// is an English-ism.
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boolean is_letter = Character.isLetter(c);
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if (c != '\'' && ! is_letter && type != Character.NON_SPACING_MARK
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&& Character.isLetter(n))
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break;
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// Always break after certain symbols, such as punctuation.
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// This heuristic is derived from hints in the JCL book and is
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// not part of Unicode. It seems to be right, however.
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// FIXME: we treat apostrophe as part of a word. This
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// is an English-ism.
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if (c != '\''
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&& (type == Character.DASH_PUNCTUATION
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|| type == Character.START_PUNCTUATION
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|| type == Character.END_PUNCTUATION
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|| type == Character.CONNECTOR_PUNCTUATION
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|| type == Character.OTHER_PUNCTUATION
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|| type == Character.MATH_SYMBOL
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|| type == Character.CURRENCY_SYMBOL
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|| type == Character.MODIFIER_SYMBOL
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|| type == Character.OTHER_SYMBOL
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|| type == Character.FORMAT
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|| type == Character.CONTROL))
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break;
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boolean is_hira = isHira (c);
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boolean is_kata = isKata (c);
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boolean is_han = isHan (c);
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// Special case Japanese.
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if (! is_hira && ! is_kata && ! is_han
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&& type != Character.NON_SPACING_MARK
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&& (isHira (n) || isKata (n) || isHan (n)))
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break;
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if (is_hira || is_kata || is_han || is_letter)
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{
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// Now we need to do some lookahead. We might need to do
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// quite a bit of lookahead, so we save our position and
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// restore it later.
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int save = iter.getIndex();
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// Skip string of non spacing marks.
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.NON_SPACING_MARK)
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n = iter.next();
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if (n == CharacterIterator.DONE)
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break;
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if ((is_hira && ! isHira (n))
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|| (is_kata && ! isHira (n) && ! isKata (n))
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|| (is_han && ! isHira (n) && ! isHan (n))
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// FIXME: we treat apostrophe as part of a word. This
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// is an English-ism.
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|| (is_letter && ! Character.isLetter(n) && n != '\''))
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break;
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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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public int previous ()
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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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boolean is_hira = isHira (c);
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boolean is_kata = isKata (c);
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boolean is_han = isHan (c);
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boolean is_letter = Character.isLetter(c);
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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 type = Character.getType(n);
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// Break after paragraph separators.
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if (type == Character.PARAGRAPH_SEPARATOR
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|| type == Character.LINE_SEPARATOR)
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break;
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// Break between letters and non-letters.
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// FIXME: we treat apostrophe as part of a word. This
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// is an English-ism.
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if (n != '\'' && ! Character.isLetter(n)
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&& type != Character.NON_SPACING_MARK
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&& is_letter)
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break;
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// Always break after certain symbols, such as punctuation.
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// This heuristic is derived from hints in the JCL book and is
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// not part of Unicode. It seems to be right, however.
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// FIXME: we treat apostrophe as part of a word. This
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// is an English-ism.
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if (n != '\''
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&& (type == Character.DASH_PUNCTUATION
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|| type == Character.START_PUNCTUATION
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|| type == Character.END_PUNCTUATION
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|| type == Character.CONNECTOR_PUNCTUATION
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|| type == Character.OTHER_PUNCTUATION
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|| type == Character.MATH_SYMBOL
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|| type == Character.CURRENCY_SYMBOL
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|| type == Character.MODIFIER_SYMBOL
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|| type == Character.OTHER_SYMBOL
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|| type == Character.FORMAT
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|| type == Character.CONTROL))
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break;
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// Special case Japanese.
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if ((is_hira || is_kata || is_han)
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&& ! isHira (n) && ! isKata (n) && ! isHan (n)
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&& type != Character.NON_SPACING_MARK)
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break;
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// We might have to skip over non spacing marks to see what's
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// on the other side.
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if (! is_hira || (! is_letter && c != '\''))
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{
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int save = iter.getIndex();
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while (n != CharacterIterator.DONE
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&& Character.getType(n) == Character.NON_SPACING_MARK)
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n = iter.previous();
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iter.setIndex(save);
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// This is a strange case: a bunch of non-spacing marks at
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// the beginning. We treat the current location as a word
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// break.
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if (n == CharacterIterator.DONE)
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break;
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if ((isHira (n) && ! is_hira)
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|| (isKata (n) && ! is_hira && ! is_kata)
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|| (isHan (n) && ! is_hira && ! is_han)
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// FIXME: we treat apostrophe as part of a word. This
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// is an English-ism.
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|| (! is_letter && c != '\'' && Character.isLetter(n)))
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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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}
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