// MetaGrammar //////////////////////////////////////////////////////////////////////////////
- public PreSequence _amp_(PreSequence p, Object[] o) { return p.and(new PreSequence(o, null).buildSequence(null, true, false)); }
- public PreSequence _amp__tilde_(PreSequence p, Object[] o) { return p.not(new PreSequence(o, null).buildSequence(null, true, false)); }
- public Element epsilon(Object o, Object b) { return Union.epsilon; }
- public Object _leftparen__rightparen_(Object o) { return Union.epsilon; }
- public Element _rightparen_(Object e) { return SELF; }
- public Union nonTerminal(String s) { return nonTerminal(s, null, false, false); }
- public Union _colon__colon__equals_(String s, PreSequence[][] p) { return nonTerminal(s, p, false, false); }
- public Union _bang__colon__colon__equals_(String s, PreSequence[][] p) { return nonTerminal(s, p, false, true); }
- public Object _leftparen_(PreSequence[][] p) { return nonTerminal("anon"+(anon++), p, false, false); }
public Union nonTerminal(String str, PreSequence[][] s, boolean synthetic, boolean dropAll) {
Union n = str.equals(startSymbol) ? g : nt.get(str);
if (n == null) nt.put(str, n = new Union(str, synthetic));
}
public PreSequence _slash_(PreSequence p, Object sep) { return p.sparse(sep); }
+ public String string(Tree<String> tree) {
+ String ret = "";
+ if (tree.head()!=null) ret += tree.head();
+ for(Tree<String> t : tree.children()) ret += string(t);
+ return ret;
+ }
+
public Object walk(Tree<String> tree) {
String head = tree.head();
if (tree.numChildren()==0) return super.walk(tree);
else if ("**".equals(head)) return Repeat.maximal(Repeat.many0((Element)walk(tree.child(0))));
else if ("++".equals(head)) return Repeat.maximal(Repeat.many1((Element)walk(tree.child(0))));
else if ("?".equals(head)) return Repeat.maybe((Element)walk(tree.child(0)));
+ else if ("&".equals(head)) return ((PreSequence)walk(tree,0)).and(new PreSequence((Element[])Reflection.lub((Object[])walk(tree, 1)), null).buildSequence(null, true, false));
+ else if ("&~".equals(head)) return ((PreSequence)walk(tree,0)).not(new PreSequence((Element[])Reflection.lub((Object[])walk(tree, 1)), null).buildSequence(null, true, false));
+ else if ("epsilon".equals(head)) return Union.epsilon;
+ else if ("()".equals(head)) return Union.epsilon;
+ else if (")".equals(head)) return SELF;
+ else if ("nonTerminal".equals(head)) return nonTerminal(string(tree.child(0)), null, false, false);
+ else if ("::=".equals(head)) return nonTerminal(string(tree.child(0)), (PreSequence[][])walk(tree, 1), false, false);
+ else if ("!::=".equals(head)) return nonTerminal(string(tree.child(0)), (PreSequence[][])walk(tree, 1), false, true);
+ else if ("(".equals(head)) return nonTerminal("anon"+(anon++), (PreSequence[][])walk(tree, 0), false, false);
else return super.walk(tree);
}