/*
 * The file "calc.y": Parser definitions
 * Contains the grammar rules and semantic actions.
 * Used by bison as an input file.
 */
/*========== 1. The Definition Section ==============================*/

%{
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>

/* The file "parser.h" contains the definition of YYSTYPE: */
/* the type of values in the semantic stack of parser      */
#include "parser.h"

/* Any C++ code may be added here... */

%}

%term INT_CONST DOUBLE_CONST NAME
%term ENDL LPAR RPAR ILLEGAL LBRACKET RBRACKET SM
%term INT DOUBLE
%left PLUS MINUS
%left MULT DIV

%start defs

%%
/*========== 2. The Grammar Section =========================================*/

        /* Program is a sequence of lines containing expressions */
defs    : def
        | defs def
        ;

def     : basetype decl SM {
                        if ($1.int_value == 0)
                            printf("int\n");
                        else
                            printf("double\n");
                    }
        | error SM
        | SM        { exit(0); }
        | ENDL      { }
        ;

basetype : INT      { $$.int_value = 0; }
         | DOUBLE   { $$.int_value = 1; }
         ;

decl    : array
        | MULT decl {
                        printf("pointer to\n");
                    }
        ;

array   : NAME      {
                        printf("%s is\n", $1.name);
                    }
        | array LBRACKET RBRACKET {
                        printf("array of undefined size of type\n");
                    }
        | array LBRACKET INT_CONST RBRACKET {
                        printf(
                            "array of size %d of type\n",
                            $3.int_value
                        );
                    }
        | LPAR decl RPAR
        ;

%%
/*================ 3. The Program Section ================================*/
int main() {
    printf("Enter the definition of variable:\n");
    yyparse();
    return 0;
}

/* Parse error diagnostics */
int yyerror(const char *s) {
    printf("%s\n", s);
    return 0;
}