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 EAss. Exp ::= Ident "=" Exp;
20 compExp. Exp ::= Exp1 Op0 Exp1 ;
21 define compExp e1 o e2 = BiOpExp e1 o e2 ;
22 op1. Exp1 ::= Exp1 Op1 Exp2 ;
23 define op1 e1 o e2 = BiOpExp e1 o e2 ;
24 op2. Exp2 ::= Exp2 Op2 Exp3 ;
25 define op2 e1 o e2 = BiOpExp e1 o e2 ;
26 postIncr. Exp3 ::= Ident "++" ;
27 define postIncr i = EPost i Plus ;
28 postDecr. Exp3 ::= Ident "--" ;
29 define postDecr i = EPost i Minus ;
30 EVar. Exp3 ::= Ident ;
31 EInt. Exp3 ::= Integer ;
32 ENeg. Exp3 ::= "-" Exp3 ;
33 ENot. Exp3 ::= "!" Exp3 ;
34 EBool. Exp3 ::= Bool ;
35 EReadI. Exp3 ::= "readInt" ;
36 EReadB. Exp3 ::= "readBool" ;
41 -- _. Stm ::= Stm ";" ;
46 Program. Stms ::= [Stm] ;
66 TInt. Type ::= "int" ;
67 TBool. Type ::= "bool" ;
71 internal ExpT. Exp ::= Type Exp ;
72 internal SNoop. Stm ::= ;
73 internal EDefault. Exp ::= ;
74 internal BiOpExp. Exp ::= Exp Op Exp ;
75 internal NoType. Type ::= ;
76 internal EPost. Exp ::= Ident Op1 ;
81 entrypoints Stms, Exp ;