1 files changed, 168 insertions, 0 deletions
diff --git a/libjava/gnu/gcj/text/LineBreakIterator.java b/libjava/gnu/gcj/text/LineBreakIterator.java
new file mode 100644
index 00000000000..b42881c864e
--- /dev/null
+++ b/libjava/gnu/gcj/text/LineBreakIterator.java
@@ -0,0 +1,168 @@
+// Default word BreakIterator.
+
+/* Copyright (C) 1999  Cygnus Solutions
+
+   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();
+  }
+}