If I just add on to the following yacc file, will it turn into a parser?
/* C-Minus BNF Grammar */
%token ELSE
%token IF
%token INT
%token RETURN
%token VOID
%token WHILE
%token ID
%token NUM
%token LTE
%token GTE
%token EQUAL
%token NOTEQUAL
%%
program : declaration_list ;
declaration_list : declaration_list declaration | declaration ;
declaration : var_declaration | fun_declaration ;
var_declaration : type_specifier ID ;
| type_specifier ID [ NUM ] ; ;
type_specifier : INT | VOID ;
fun_declaration : type_specifier ID ( params ) compound_stmt ;
params : param_list | VOID ;
param_list : param_list , param
| param ;
param : type_specifier ID | type_specifier ID [ ] ;
compound_stmt : { local_declarations statement_list } ;
local_declarations : local_declarations var_declaration
| /* empty */ ;
statement_list : statement_list statement
| /* empty */ ;
statement : expression_stmt
| compound_stmt
| selection_stmt
| iteration_stmt
| return_stmt ;
expression_stmt : expression ;
| ; ;
selection_stmt : IF ( expression ) statement
| IF ( expression ) statement ELSE statement ;
iteration_stmt : WHILE ( expression ) statement ;
return_stmt : RETURN ; | RETURN expression ; ;
expression : var = expression | simple_expression ;
var : ID | ID [ expression ] ;
simple_expression : additive_expression relop additive_expression
| additive_expression ;
relop : LTE | < | > | GTE | EQUAL | NOTEQUAL ;
additive_expression : additive_expression addop term | term ;
addop : + | - ;
term : term mulop factor | factor ;
mulop : * | / ;
factor : ( expression ) | var | call | NUM ;
call : ID ( args ) ;
args : arg_list | /* empty */ ;
arg_list : arg_list , expression | expression ;