X-Git-Url: http://git.megacz.com/?a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FElement.java;h=27a3ee64edc3220951fd1bb88e3833bd9d46fefe;hb=c78e4efbba69fc058bbe487319b3abf5d94df3cb;hp=4ccde61eb49ecb9cf23c164c9f013cb5c7c8a0ce;hpb=0e17670bcfa7b0fe8eb3a2cac81f4b080a09fc98;p=sbp.git
diff --git a/src/edu/berkeley/sbp/Element.java b/src/edu/berkeley/sbp/Element.java
index 4ccde61..27a3ee6 100644
--- a/src/edu/berkeley/sbp/Element.java
+++ b/src/edu/berkeley/sbp/Element.java
@@ -1,21 +1,20 @@
+// (C) 2006-2007 all rights reserved; see LICENSE file for BSD-style license
+
package edu.berkeley.sbp;
-import edu.berkeley.sbp.util.*;
-import edu.berkeley.sbp.*;
-import edu.berkeley.sbp.*;
-import java.io.*;
import java.util.*;
-import java.lang.reflect.*;
-import java.lang.ref.*;
-/** the root superclass for all components of the grammar (terminals, nonterminals, literals, etc) */
-public abstract class Element {
+/**
+ *
+ * the root superclass for all components of the grammar (terminals,
+ * nonterminals, literals, etc)
+ *
+ */
+public abstract class Element implements SequenceOrElement {
/** sorry, you can't make up new, custom elements */
Element() { }
+ /** a more verbose version of toString() for displaying whole grammars */
abstract StringBuffer toString(StringBuffer sb);
- /** returns the Forest resulting from matching this element against the empty string */
- Forest epsilonForm() { throw new Error("element " + this + " has no epsilon form"); }
-
}