Initial revision

From-SVN: r26263

1 files changed, 188 insertions, 0 deletions

diff --git a/libjava/gnu/gcj/text/CharacterBreakIterator.java b/libjava/gnu/gcj/text/CharacterBreakIterator.java
new file mode 100644
index 00000000000..e1777fd9945
--- /dev/null
+++ b/libjava/gnu/gcj/text/CharacterBreakIterator.java
@@ -0,0 +1,188 @@
+// Default character 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 19, 1999
+ * Written using The Unicode Standard, Version 2.0.
+ */
+
+public class CharacterBreakIterator extends BaseBreakIterator
+{
+  // Hangul Jamo constants from Unicode book.
+  private static final int LBase = 0x1100;
+  private static final int VBase = 0x1161;
+  private static final int TBase = 0x11a7;
+  private static final int LCount = 19;
+  private static final int VCount = 21;
+  private static final int TCount = 28;
+
+  // Information about surrogates.
+  private static final int highSurrogateStart = 0xD800;
+  private static final int highSurrogateEnd = 0xDBFF;
+  private static final int lowSurrogateStart = 0xDC00;
+  private static final int lowSurrogateEnd = 0xDFFF;
+
+  public Object clone ()
+  {
+    return new CharacterBreakIterator (this);
+  }
+
+  public CharacterBreakIterator ()
+  {
+    iter = null;		// FIXME?
+  }
+
+  private CharacterBreakIterator (CharacterBreakIterator other)
+  {
+    iter = (CharacterIterator) other.iter.clone();
+  }
+
+  // Some methods to tell us different properties of characters.
+  private final boolean isL (char c)
+  {
+    return c >= LBase && c <= LBase + LCount;
+  }
+  private final boolean isV (char c)
+  {
+    return c >= VBase && c <= VBase + VCount;
+  }
+  private final boolean isT (char c)
+  {
+    return c >= TBase && c <= TBase + TCount;
+  }
+  private final boolean isLVT (char c)
+  {
+    return isL (c) || isV (c) || isT (c);
+  }
+  private final boolean isHighSurrogate (char c)
+  {
+    return c >= highSurrogateStart && c <= highSurrogateEnd;
+  }
+  private final boolean isLowSurrogate (char c)
+  {
+    return c >= lowSurrogateStart && c <= lowSurrogateEnd;
+  }
+
+  public int next ()
+  {
+    int end = iter.getEndIndex();
+    if (iter.getIndex() == end)
+      return DONE;
+
+    char c;
+    for (char prev = CharacterIterator.DONE; iter.getIndex() < end; prev = c)
+      {
+	c = iter.next();
+	if (c == CharacterIterator.DONE)
+	  break;
+	int type = Character.getType(c);
+
+	// Break after paragraph separators.
+	if (type == Character.PARAGRAPH_SEPARATOR)
+	  break;
+
+	// Now we need some lookahead.
+	char ahead = iter.next();
+	iter.previous();
+	if (ahead == CharacterIterator.DONE)
+	  break;
+	int aheadType = Character.getType(ahead);
+
+	if (aheadType != Character.NON_SPACING_MARK
+	    && ! isLowSurrogate (ahead)
+	    && ! isLVT (ahead))
+	  break;
+	if (! isLVT (c) && isLVT (ahead))
+	  break;
+	if (isL (c) && ! isLVT (ahead)
+	    && aheadType != Character.NON_SPACING_MARK)
+	  break;
+	if (isV (c) && ! isV (ahead) && !isT (ahead)
+	    && aheadType != Character.NON_SPACING_MARK)
+	  break;
+	if (isT (c) && ! isT (ahead)
+	    && aheadType != Character.NON_SPACING_MARK)
+	  break;
+
+	if (! isHighSurrogate (c) && isLowSurrogate (ahead))
+	  break;
+	if (isHighSurrogate (c) && ! isLowSurrogate (ahead))
+	  break;
+	if (! isHighSurrogate (prev) && isLowSurrogate (c))
+	  break;
+      }
+
+    return iter.getIndex();
+  }
+
+  public int previous ()
+  {
+    if (iter.getIndex() == iter.getBeginIndex())
+      return DONE;
+
+    int start = iter.getBeginIndex();
+    while (iter.getIndex() >= iter.getBeginIndex())
+      {
+	char c = iter.previous();
+	if (c == CharacterIterator.DONE)
+	  break;
+	int type = Character.getType(c);
+
+	if (type != Character.NON_SPACING_MARK
+	    && ! isLowSurrogate (c)
+	    && ! isLVT (c))
+	  break;
+
+	// Now we need some lookahead.
+	char ahead = iter.previous();
+	if (ahead == CharacterIterator.DONE)
+	  {
+	    iter.next();
+	    break;
+	  }
+	char ahead2 = iter.previous();
+	iter.next();
+	iter.next();
+	if (ahead2 == CharacterIterator.DONE)
+	  break;
+	int aheadType = Character.getType(ahead);
+
+	if (aheadType == Character.PARAGRAPH_SEPARATOR)
+	  break;
+
+	if (isLVT (c) && ! isLVT (ahead))
+	  break;
+	if (! isLVT (c) && type != Character.NON_SPACING_MARK
+	    && isL (ahead))
+	  break;
+	if (! isV (c) && ! isT (c) && type != Character.NON_SPACING_MARK
+	    && isV (ahead))
+	  break;
+	if (! isT (c) && type != Character.NON_SPACING_MARK
+	    && isT (ahead))
+	  break;
+
+	if (isLowSurrogate (c) && ! isHighSurrogate (ahead))
+	  break;
+	if (! isLowSurrogate (c) && isHighSurrogate (ahead))
+	  break;
+	if (isLowSurrogate (ahead) && ! isHighSurrogate (ahead2))
+	  break;
+      }
+
+    return iter.getIndex();
+  }
+}