import java.util.*;
/** if ambiguity checking is enabled, this exception is thrown to signal that the parse was ambiguous */
-public class Ambiguous extends RuntimeException {
- public final Forest ambiguity;
- public Ambiguous(Forest ambiguity) { this.ambiguity = ambiguity; }
+public class Ambiguous extends Exception {
+ final Forest<?> ambiguity;
+ private final HashSet<Tree<?>> ht;
+ Ambiguous(Forest<?> ambiguity, HashSet<Tree<?>> ht) {
+ this.ambiguity = ambiguity;
+ this.ht = ht;
+ }
+
+ public Forest<?> getAmbiguity() { return ambiguity; }
+
public String toString() {
+ // FIXME: print the input region that was ambiguously matched
StringBuffer sb = new StringBuffer();
- sb.append("unresolved ambiguity "/*"at " + ambiguity.getLocation() + ":"*/);
- for(Object result : ambiguity.expand(false))
- sb.append("\n " + result);
+ sb.append("unresolved ambiguity; shared subtrees are shown as \"*\" ");
+ for(Tree<?> result : ht) {
+ sb.append("\n possibility: ");
+ StringBuffer sb2 = new StringBuffer();
+ result.toPrettyString(sb2);
+ sb.append(StringUtil.indent(sb2.toString(), 15));
+ }
return sb.toString();
}
}