minor change

[proglang.git] / syntax.cf

diff --git a/syntax.cf b/syntax.cf
index 7b84054391014ef81d22f0f03d8e8866af3049ce..44a6cb4284db6eb0d08e95ec53423cccab7f8eb8 100644 (file)
--- a/syntax.cf
+++ b/syntax.cf
@@ -1,14 +1,21 @@
 
 -- ordinary rules
 
-Program.  Stms ::= [Stm] ;
+
+True.    Bool ::= "true" ;
+False.   Bool ::= "false" ;
+
+TInt.   Type  ::= "int" ;
+TBool.  Type  ::= "bool" ;
+
+Program.  Program ::= [FuncStm] ;
 
 
-SExp.     Stm      ::= Exp ";" ;
-SBlock.   Stm      ::= "{" [Stm] "}" ;
-SDecl.   Stm      ::= Type Ident "=" Exp ";" ;
-decl.    Stm      ::= Type Ident ";" ;
-define decl t v = SDecl t  v EDefault ;
+SExp.      Stm      ::= Exp ";" ;
+SBlock.    Stm      ::= "{" [Stm] "}" ;
+SDecl. Stm ::= Type Ident "=" Exp ";" ;
+SDeclD. Stm ::= Type Ident ";" ;
+
 
 SWhile.   Stm      ::= "while" "(" Exp ")" Stm ;
 SIf.     Stm      ::= "if" "(" Exp ")" Stm "else" Stm ;
@@ -18,6 +25,8 @@ define if e s = SIf e s SNoop ;
 -- SFor.     Stm      ::= "for" "(" Stm Exp ";" Exp ")" Stm ;
 SPrint.   Stm      ::= "print" Exp ";" ;
 
+SReturn. Stm ::= "return" Exp ";" ;
+
 
 
 EAss.     Exp     ::= Ident "=" Exp;
@@ -47,6 +56,9 @@ ENot.     Exp3    ::= "!" Exp3 ;
 EReadI.   Exp3    ::= "readInt" ;
 EReadB.   Exp3    ::= "readBool" ;
 
+EFunc.    Exp3    ::= Ident "(" [Exp] ")" ;
+
+
 
 coercions Exp 3 ;
 
@@ -56,6 +68,23 @@ coercions Exp 3 ;
 
 terminator Stm "" ;
 
+separator Exp "," ;
+
+Decl. Decl ::= Type Ident ;
+
+separator Decl "," ;
+
+Func. Func ::= Type Ident "(" [Decl] ")" "{" [Stm] "}" ;
+
+separator Func "" ;
+
+S. FuncStm ::= Stm ;
+F. FuncStm ::= Func ;
+
+separator FuncStm "" ;
+
+-- E1. Exps ::= Exp ;
+-- E2. Exps ::= Exp "," Exps ;
 
 Lt.  Op0 ::= "<" ;
 ELt. Op0 ::= "<=" ;
@@ -74,22 +103,17 @@ _. Op ::= Op2;
 _. Op ::= Op0;
 
 
-True.    Bool ::= "true" ;
-False.   Bool ::= "false" ;
-
-TInt.   Type  ::= "int" ;
-TBool.  Type  ::= "bool" ;
-
 -- pragmas
 
-internal ExpT. Exp ::= Type Exp ;
-internal SNoop. Stm ::= ;
-internal EDefault. Exp ::= ;
+-- internal ExpT. Exp ::= Type Exp ;
+-- internal EDefault. Exp ::= ;
 internal BiOpExp. Exp ::= Exp Op Exp ;
-internal NoType. Type ::= ;
+-- internal NoType. Type ::= ;
 internal EPost. Exp ::= Ident Op1 ;
 
+internal SNoop. Stm ::= ;
+
 comment "/*" "*/" ;
 comment "//" ;
 
-entrypoints Stms, Exp ;
+entrypoints Program;