2003/06/28 06:54:18

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

diff --git a/src/gnu/regexp/REToken.java b/src/gnu/regexp/REToken.java
new file mode 100644 (file)
index 0000000..d5075a2
--- /dev/null
+++ b/src/gnu/regexp/REToken.java
@@ -0,0 +1,68 @@
+/*
+ *  gnu/regexp/REToken.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;
+
+abstract class REToken implements Serializable {
+
+  protected REToken next = null;
+  protected REToken uncle = null;
+  protected int subIndex;
+
+  protected REToken(int subIndex) {
+      this.subIndex = subIndex;
+  }
+
+  int getMinimumLength() {
+    return 0;
+  }
+
+  void setUncle(REToken anUncle) {
+    uncle = anUncle;
+  }
+
+    /** Returns true if the match succeeded, false if it failed. */
+    abstract boolean match(CharIndexed input, REMatch mymatch);
+  
+    /** Returns true if the rest of the tokens match, false if they fail. */
+    protected boolean next(CharIndexed input, REMatch mymatch) {
+       if (next == null) {
+           if (uncle == null) {
+               return true;
+           } else {
+               return uncle.match(input, mymatch);
+           }
+       } else {
+           return next.match(input, mymatch);
+       }
+    }
+  
+  boolean chain(REToken token) {
+      next = token;
+      return true; // Token was accepted
+  }
+
+    abstract void dump(StringBuffer os);
+
+  void dumpAll(StringBuffer os) {
+    dump(os);
+    if (next != null) next.dumpAll(os);
+  }
+}