4 True. Bool ::= "true" ;
5 False. Bool ::= "false" ;
7 SDecl. Stm ::= Type Ident "=" Exp ";" ;
8 decl. Stm ::= Type Ident ";" ;
9 define decl t v = SDecl t v EDefault ;
10 SExp. Stm ::= Exp ";" ;
11 SBlock. Stm ::= "{" [Stm] "}" ;
12 if. Stm ::= "if" "(" Exp ")" Stm ;
13 SIf. Stm ::= "if" "(" Exp ")" Stm "else" Stm ;
14 define if e s = SIf e s SNoop ;
15 SWhile. Stm ::= "while" "(" Exp ")" Stm ;
16 -- SFor. Stm ::= "for" "(" Stm Exp ";" Exp ")" Stm ;
17 SPrint. Stm ::= "print" Exp ";" ;
19 -- VVar. Var ::= Ident ;
20 -- VAss. Var ::= Ident "=" Exp;
22 BExp. Exp ::= Exp1 BOp Exp1 ;
23 op1. Exp1 ::= Exp1 Op1 Exp2 ;
24 define op1 e1 o e2 = OpExp e1 o e2 ;
25 op2. Exp2 ::= Exp2 Op2 Exp3 ;
26 define op2 e1 o e2 = OpExp e1 o e2 ;
27 EIncr. Exp3 ::= Ident "++" ;
28 EDecr. Exp3 ::= Ident "--" ;
29 EVar. Exp3 ::= Ident ;
30 EAss. Exp3 ::= Ident "=" Exp;
31 EInt. Exp3 ::= Integer ;
32 ENeg. Exp3 ::= "-" Exp3 ;
33 EBool. Exp3 ::= Bool ;
34 EReadI. Exp3 ::= "readInt" ;
35 EReadB. Exp3 ::= "readBool" ;
45 Program. Stms ::= [Stm] ;
64 TInt. Type ::= "int" ;
65 TBool. Type ::= "bool" ;
69 internal ExpT. Exp ::= Type Exp ;
70 internal SNoop. Stm ::= ;
71 internal EDefault. Exp ::= ;
72 internal OpExp. Exp ::= Exp Op Exp ;
73 internal NoType. Type ::= ;
78 entrypoints Stms, Exp ;