X-Git-Url: http://git.megacz.com/?p=sbp.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fsbp%2FElement.java;h=7eb6a59b53f170689fdc395a8fae574165d38008;hp=c94adbdcc6f80a3ed43822c8b632b1fef16dc0b5;hb=2c1c0293545f3d12c23220fd05c663e6aa3f3de1;hpb=fd97655ce34c3aff1a47bfb2f45775ac711923b1
diff --git a/src/edu/berkeley/sbp/Element.java b/src/edu/berkeley/sbp/Element.java
index c94adbd..7eb6a59 100644
--- a/src/edu/berkeley/sbp/Element.java
+++ b/src/edu/berkeley/sbp/Element.java
@@ -7,18 +7,15 @@ 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 {
- /** if this element always matches exactly one token, return a topology covering exactly those possible tokens, otherwise null */
- abstract Topology toAtom();
+ /** sorry, you can't make up new, custom elements */
+ Element() { }
+
+ 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"); }
- Forest epsilonForm() { throw new Error("no epsilon form: " + this); }
- final boolean possiblyEpsilon(Walk.Cache cache) {
- Boolean ret = cache==null ? null : cache.possiblyEpsilon.get(this);
- if (ret != null) return ret.booleanValue();
- ret = new Walk.PossiblyEpsilon().walk(this) ? Boolean.TRUE : Boolean.FALSE;
- if (cache != null) cache.possiblyEpsilon.put(this, ret);
- return ret;
- }
}