(+ 1 2 3 45) (* 1 2 3 4 (\\ 1 3 4 (* 12 34 54) 32 (+ 34 56))) I want to develop

Question

(+ 1 2 3 45)

(* 1 2 3 4 ( 1 3 4 (* 12 34 54) 32 (+ 34 56)))

I want to develop the grammar for the above language in ANTLR. This is my ANTLR code but it has error in it.

stat        :   '(' expr ')'
       ;

expr        :   ((PLUS | MINUS|MULT|DIV) atom atom+)?('('expr')'*|('('expr))
                 ;

atom        :   INT;

INT           : '0'..'9'+;

PLUS        :    '+'
       ;
MINUS       :    '-'
       ;
MULT       :   '*'
       ;
DIV       :   '/' ;

NEWLINE    :   ' '?' '
       ;
WS        :   (' '|' '|' '|' ')+ {skip();};

Explanation / Answer

may be due to missing quotes in your expression

((PLUS | MINUS|MULT|DIV) atom atom+)?('('expr')'*|('('expr')');

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