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