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// Default word BreakIterator.
/* Copyright (C) 1999 Free Software Foundation
This file is part of libgcj.
This software is copyrighted work licensed under the terms of the
Libgcj License. Please consult the file "LIBGCJ_LICENSE" for
details. */
package gnu.gcj.text;
import java.text.BreakIterator;
import java.text.CharacterIterator;
/**
* @author Tom Tromey <tromey@cygnus.com>
* @date March 22, 1999
* Written using The Unicode Standard, Version 2.0.
*/
public class LineBreakIterator extends BaseBreakIterator
{
public Object clone ()
{
return new LineBreakIterator (this);
}
public LineBreakIterator ()
{
iter = null;
}
private LineBreakIterator (LineBreakIterator other)
{
iter = (CharacterIterator) other.iter.clone();
}
// Some methods to tell us different properties of characters.
private final boolean isNb (char c)
{
return (c == 0x00a0 // NO-BREAK SPACE
|| c == 0x2011 // NON-BREAKING HYPHEN
|| c == 0xfeff); // ZERO WITH NO-BREAK SPACE
}
private final boolean isClose (int type)
{
return (type == Character.END_PUNCTUATION
// Unicode book says "comma, period, ...", which I take to
// mean "Po" class.
|| type == Character.OTHER_PUNCTUATION);
}
private final boolean isIdeo (char c)
{
return (c >= 0x3040 && c <= 0x309f // Hiragana
|| c >= 0x30a0 && c <= 0x30ff // Katakana
|| c >= 0x4e00 && c <= 0x9fff // Han
|| c >= 0x3100 && c <= 0x312f); // Bopomofo
}
public int next ()
{
int end = iter.getEndIndex();
if (iter.getIndex() == end)
return DONE;
while (iter.getIndex() < end)
{
char c = iter.current();
int type = Character.getType(c);
char n = iter.next();
if (n == CharacterIterator.DONE
|| type == Character.PARAGRAPH_SEPARATOR
|| type == Character.LINE_SEPARATOR)
break;
// Handle two cases where we must scan for non-spacing marks.
int start = iter.getIndex();
if (type == Character.SPACE_SEPARATOR
|| type == Character.START_PUNCTUATION
|| isIdeo (c))
{
while (n != CharacterIterator.DONE
&& Character.getType(n) == Character.NON_SPACING_MARK)
n = iter.next();
if (n == CharacterIterator.DONE)
break;
if (type == Character.SPACE_SEPARATOR)
{
int nt = Character.getType(n);
if (nt != Character.NON_SPACING_MARK
&& nt != Character.SPACE_SEPARATOR
&& ! isNb (n))
break;
}
else if (type == Character.START_PUNCTUATION)
{
if (isIdeo (n))
{
// Open punctuation followed by non spacing marks
// and then ideograph does not have a break in
// it. So skip all this.
start = iter.getIndex();
}
}
else
{
// Ideograph preceded this character.
if (isClose (Character.getType(n)))
break;
}
}
iter.setIndex(start);
}
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;
int type = Character.getType(c);
char n = iter.previous();
if (n == CharacterIterator.DONE)
break;
iter.next();
int nt = Character.getType(n);
// Break after paragraph separators.
if (nt == Character.PARAGRAPH_SEPARATOR
|| nt == Character.LINE_SEPARATOR)
break;
// Skip non-spacing marks.
int init = iter.getIndex();
while (n != CharacterIterator.DONE && nt == Character.NON_SPACING_MARK)
{
n = iter.previous();
nt = Character.getType(n);
}
if (nt == Character.SPACE_SEPARATOR
&& type != Character.SPACE_SEPARATOR
&& type != Character.NON_SPACING_MARK
&& ! isNb (c))
break;
if (! isClose (type) && isIdeo (n))
break;
if (isIdeo (c) && nt != Character.START_PUNCTUATION)
break;
iter.setIndex(init);
}
return iter.getIndex();
}
}
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