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      1 grammar Lang;
      2 options {
      3 	output=AST;
      4 	language = ObjC;
      5 	ASTLabelType=ANTLRCommonTree;
      6 }
      7 
      8 tokens {DECL;} // an imaginary node
      9 
     10 start : decl ;
     11 
     12 decl : type ID ';' -> ^(DECL type ID)
     13      ;
     14 type : INTTYPE  // automatic tree construction builds a node for this rule
     15      | FLOATTYPE
     16      ;
     17 
     18 INTTYPE : 'int' ;
     19 FLOATTYPE : 'float' ;
     20 ID : 'a'..'z'+ ;
     21 INT : '0'..'9'+ ;
     22 WS : (' '|'\n') {$channel=HIDDEN;} ;
     23