2003/06/28 06:54:18

[org.ibex.core.git] / src / gnu / regexp / CharIndexedStringBuffer.java

diff --git a/src/gnu/regexp/CharIndexedStringBuffer.java b/src/gnu/regexp/CharIndexedStringBuffer.java
new file mode 100644 (file)
index 0000000..b9ea934
--- /dev/null
+++ b/src/gnu/regexp/CharIndexedStringBuffer.java
@@ -0,0 +1,43 @@
+/*
+ *  gnu/regexp/CharIndexedStringBuffer.java
+ *  Copyright (C) 1998-2001 Wes Biggs
+ *
+ *  This library is free software; you can redistribute it and/or modify
+ *  it under the terms of the GNU Lesser General Public License as published
+ *  by the Free Software Foundation; either version 2.1 of the License, or
+ *  (at your option) any later version.
+ *
+ *  This library 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 Lesser General Public License for more details.
+ *
+ *  You should have received a copy of the GNU Lesser General Public License
+ *  along with this program; if not, write to the Free Software
+ *  Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ */
+package gnu.regexp;
+import java.io.Serializable;
+
+class CharIndexedStringBuffer implements CharIndexed, Serializable {
+    private StringBuffer s;
+    private int anchor;
+
+    CharIndexedStringBuffer(StringBuffer str, int index) {
+       s = str;
+       anchor = index;
+    }
+
+  public char charAt(int index) {
+      int pos = anchor + index;
+    return ((pos < s.length()) && (pos >= 0)) ? s.charAt(pos) : OUT_OF_BOUNDS;
+  }
+
+  public boolean isValid() {
+    return (anchor < s.length());
+  }
+
+  public boolean move(int index) {
+    return ((anchor += index) < s.length());
+  }
+}