RosettaCodeData/Task/Metaprogramming/Rascal/metaprogramming-1.rascal

extend ViewParseTree;

layout Whitespace = [\ \t\n]*;
syntax A = "a";
syntax B = "b";
start syntax C = "c" | A C B;

layout Whitespace = [\ \t\n]*;
lexical Integer = [0-9]+;
start syntax E1 = Integer
               | E "*" E
	       > E "+" E
	       | "(" E ")"
               ;