* @param shortForm the "short form" display; usually
* @param synthetic if true, this Union's "long form" is "obvious" and should not be displayed when printing the grammar
*/
+ public Union() { this(null, false); }
public Union(String shortForm) { this(shortForm, false); }
public Union(String shortForm, boolean synthetic) {
this.shortForm = shortForm;
this.synthetic = synthetic;
}
- /** display form for the Union (ie not including the RHS) */
final String shortForm;
-
- /** this is just a hint to use when printing out the grammar in visual form */
final boolean synthetic;
-
- /** the actual alternatives */
private final List<Sequence> alternatives = new ArrayList<Sequence>();
public Iterator<Sequence> iterator() { return alternatives.iterator(); }
// Display //////////////////////////////////////////////////////////////////////////////
- public String toString() { return shortForm; }
+ public String getName() {
+ if (shortForm != null) return shortForm;
+ return "(anon_union)";
+ }
+ public String toString() {
+ if (shortForm != null) return shortForm;
+ StringBuffer sb = new StringBuffer();
+ sb.append("(");
+ bodyToString(sb, "", " | ");
+ sb.append(")");
+ return sb.toString();
+ }
public StringBuffer toString(StringBuffer sb) {
if (synthetic) return sb;
boolean first = true;
+ String before = StringUtil.pad(15, getName()) + " = ";
if (alternatives.size()==0) {
- sb.append(StringUtil.pad(15, shortForm) + " = ");
- } else for(Sequence s : this) {
- sb.append(StringUtil.pad(15, first ? shortForm : "") + (first ? " = " : " | "));
- first = false;
- sb.append(s.toString());
+ sb.append(before);
+ } else {
+ bodyToString(sb,
+ before,
+ "\n" + StringUtil.pad(15, "") + " | ");
sb.append('\n');
}
- sb.append('\n');
return sb;
}
+
+ private void bodyToString(StringBuffer sb, String before, String between) {
+ boolean first = true;
+ for(Sequence s : this) {
+ if (s.lame) continue;
+ // FIXME: what to do here about printing out negated sequences?
+ sb.append(first ? before : between);
+ first = false;
+ sb.append(s.toString());
+ }
+ }
}