switch.cfg

S -> Pgm
Pgm -> Statement Pgm | ε 
Statement -> Switch | Declaration ; | InitExpr ; | UpdateExpr ; | FnExpr ; | break ;

//Main switch case
Switch -> switch ( Expr ) { caseList defaultOpr caseList}
DefaultOpr ->  default : casebody  
CaseList  -> ε | oneCase CaseList 
OneCase  -> case  constValue : casebody 
Casebody    -> { Pgm } | Pgm //casebody data
ConstValue -> int | char 


//FInal Expression:
FnExp -> console.log ( Value ) ;

//Expression with operator precedence
Expr -> A Expr`
Expr` -> or Expr` | ε

T ->​ F T`
T` ->​ ​and​ T |​ ε

F ->​ G F`
F` ->​ ​bitwise_or F |​ ε

G ->​ H G`
G` ->​ ​bitwise_xor G |​ ε

H ->​ I H`
H` ->​ ​bitwise_and H | ε

I ->​ J I`
I` ->​ EqualityOp I ​|​ ε

J ->​ K J`
J` ->​ RelOp J ​|​ ε

K ->​ L K`
K` ->​ BitwiseOp K ​|​ ε

L ->​ M L`
L` ->​ BasicArthOpr L ​|​ ε

M ->​ N M`
M` ->​ CmpxArthOpr M ​|​ ε

N ->​ Value ​|​ (​ Expr )

Value ​->​ id​ |​ Literal
Literal ​->​ int​ |​ double |​ boolean |​ string

//Other operator groups
BasicArthOpr  -> + | -
CmpxArthOpr -> * | / | %

BitwiseOp -> << | >>

RelOp -> < | > | >= | <= 
EqualityOp -> == | !=