169 lines
3.9 KiB
Java
169 lines
3.9 KiB
Java
// Default word BreakIterator.
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/* Copyright (C) 1999 Cygnus Solutions
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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 22, 1999
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* Written using The Unicode Standard, Version 2.0.
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*/
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public class LineBreakIterator extends BaseBreakIterator
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{
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public Object clone ()
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{
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return new LineBreakIterator (this);
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}
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public LineBreakIterator ()
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{
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iter = null;
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}
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private LineBreakIterator (LineBreakIterator 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 isNb (char c)
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{
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return (c == 0x00a0 // NO-BREAK SPACE
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|| c == 0x2011 // NON-BREAKING HYPHEN
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|| c == 0xfeff); // ZERO WITH NO-BREAK SPACE
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}
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private final boolean isClose (int type)
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{
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return (type == Character.END_PUNCTUATION
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// Unicode book says "comma, period, ...", which I take to
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// mean "Po" class.
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|| type == Character.OTHER_PUNCTUATION);
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}
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private final boolean isIdeo (char c)
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{
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return (c >= 0x3040 && c <= 0x309f // Hiragana
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|| c >= 0x30a0 && c <= 0x30ff // Katakana
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|| c >= 0x4e00 && c <= 0x9fff // Han
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|| c >= 0x3100 && c <= 0x312f); // Bopomofo
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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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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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|| type == Character.PARAGRAPH_SEPARATOR
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|| type == Character.LINE_SEPARATOR)
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break;
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// Handle two cases where we must scan for non-spacing marks.
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int start = iter.getIndex();
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if (type == Character.SPACE_SEPARATOR
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|| type == Character.START_PUNCTUATION
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|| isIdeo (c))
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{
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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 (type == Character.SPACE_SEPARATOR)
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{
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int nt = Character.getType(n);
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if (nt != Character.NON_SPACING_MARK
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&& nt != Character.SPACE_SEPARATOR
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&& ! isNb (n))
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break;
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}
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else if (type == Character.START_PUNCTUATION)
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{
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if (isIdeo (n))
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{
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// Open punctuation followed by non spacing marks
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// and then ideograph does not have a break in
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// it. So skip all this.
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start = iter.getIndex();
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}
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}
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else
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{
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// Ideograph preceded this character.
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if (isClose (Character.getType(n)))
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break;
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}
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}
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iter.setIndex(start);
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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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int type = Character.getType(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 nt = Character.getType(n);
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// Break after paragraph separators.
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if (nt == Character.PARAGRAPH_SEPARATOR
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|| nt == Character.LINE_SEPARATOR)
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break;
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// Skip non-spacing marks.
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int init = iter.getIndex();
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while (n != CharacterIterator.DONE && nt == Character.NON_SPACING_MARK)
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{
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n = iter.previous();
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nt = Character.getType(n);
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}
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if (nt == Character.SPACE_SEPARATOR
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&& type != Character.SPACE_SEPARATOR
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&& type != Character.NON_SPACING_MARK
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&& ! isNb (c))
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break;
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if (! isClose (type) && isIdeo (n))
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break;
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if (isIdeo (c) && nt != Character.START_PUNCTUATION)
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break;
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iter.setIndex(init);
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}
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return iter.getIndex();
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}
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}
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