[antlr-interest] a question about AST tree

[xdm]

It is a simple expression. 

 

class CalcParser extends Parser;

options { buildAST=true; }

expr : ( NUM expr_tail  )  | ( LPAREN!  expr RPAREN!  expr_tail ) ;

expr_tail : ( (PLUS^|SUB^|MUL^|DIV^) expr )*  ;

 

 

For the expression "2+4", the result is supposed to be "+ 2 4", but I just
get "2". 

 

Can you tell me why??

 

 

 

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