Consider the following grammar for simple declarations:

decl$-$list $$ decl$-$list ; decl $|$ decl

decl $$ simple$-$decl$|$structured$-$decl

simple$-$decl $$ type var$-$list

structured$-$decl $$ type var$[$num$]//$ id$[$num$]$ means an array whose size is

given by num.val

type $$ integer $|$ real

var$-$list $$ var, var$-$list $|$ var

var $id$

a$)(10$ marks$)$ Write an attribute grammar to insert the type of the variables in the

symbol table. If it is an array you have to insert its elements type and its size in

addition to indicating that this variable is a structured variable.

$($Hint: consider the type field in the symbol table as a structure that has the fields:

category$($simple$/$structured$),$

element$-$type which includes simply integer or real in case of a simple

type, and includes the element type of an array $($also integer or real$)$ in

case of an array, and

size which includes the size of an array and null in case of simple types

you can also assume that you have the following semantic actions insert$-$

category, insert$-$type, insert$-$size, and insert$-$link with appropriate parameters.