BAD JSON RESPONSE with a parser and no lexer on lab site. about antlr4-lab HOT 3 CLOSED

// DELETE THIS CONTENT IF YOU PUT COMBINED GRAMMAR IN Parser TAB
lexer grammar ExprLexer;

OP : '+' | '-' | '*' | '/';
AND : 'and' ;
OR : 'or' ;
NOT : 'not' ;
EQ : '=' ;
COMMA : ',' ;
SEMI : ';' ;
LPAREN : '(' ;
RPAREN : ')' ;
LCURLY : '{' ;
RCURLY : '}' ;

INT : [0-9]+ ;
TEXT: [a-zA-Z_0-9]+;
ID: [a-zA-Z_][a-zA-Z_0-9]* ;
WS: [ \t\n\r\f]+ -> skip ;
STR_DEL: '"';

parser grammar ExprParser;
options { tokenVocab=ExprLexer; }

program
    : (stat | def)* EOF
    ;

stat: (assignment
    | func) SEMI
    ;

assignment : ID EQ expr;

def : ID '(' ID (',' ID)* ')' '{' stat* '}' ;

expr: ID
    | INT
    | str
    | func
    | 'not' expr
    | expr 'and' expr
    | expr 'or' expr
    | expr OP expr
    ;

func : ID LPAREN (expr (',' expr)*)? RPAREN ;

str : '"' TEXT? '"';

f(x,y) {
    a = 3+foo;
    b = foo * bar;
    z = x and y;
    rank = zz("banana");
    zz();
}

banana = richi;

// DELETE THIS CONTENT IF YOU PUT COMBINED GRAMMAR IN Parser TAB
lexer grammar ExprLexer;

OP : '+' | '-' | '*' | '/';
AND : 'and' ;
OR : 'or' ;
NOT : 'not' ;
EQ : '=' ;
COMMA : ',' ;
SEMI : ';' ;
LPAREN : '(' ;
RPAREN : ')' ;
LCURLY : '{' ;
RCURLY : '}' ;

INT : [0-9]+ ;
ID: [a-zA-Z_][a-zA-Z_0-9]* ;
TEXT: [a-zA-Z_0-9]+;
WS: [ \t\n\r\f]+ -> skip ;
STR_DEL: '"';