added function parser rules

src/yacc/parser.y

@@ -63,7 +63,8 @@
 %left OpBitand OpBitor OpBitxor OpBitnot
 
 %%
-program: statementlist;
+program: statementlist
+        | fundef;
 
 expr: ValFloat
     | ValInt
@@ -76,10 +77,35 @@ exprlist: expr ',' exprlist
         | expr
         | ;
 
-paramlist: paramlist '(' exprlist ')'
+argumentlist: argumentlist '(' exprlist ')'
     | ;
 
-funcall: Ident paramlist { DEBUG("Function call"); };
+fundef: KeyFun Ident paramlist '{' statementlist'}' { DEBUG("Function");};
+
+paramlist: paramlist '(' params ')'
+         |  paramlist '(' ')'
+         | '(' params ')'
+         | '(' ')';
+
+params: IOqualifyier paramdecl ',' params
+      | IOqualifyier paramdecl;
+
+IOqualifyier: KeyIn
+            | KeyOut
+            | KeyIn KeyOut
+            | KeyOut KeyIn
+            | ;
+
+paramdecl: type ':' Ident { DEBUG("Param-Declaration"); };
+
+
+
+
+
+
+
+
+funcall: Ident argumentlist { DEBUG("Function call"); };
 
 assign: Ident '=' expr { DEBUG("Assignment"); };
 
@@ -102,8 +128,7 @@ branch: branchif branchelseifs
     | branchif branchelseifs branchelse;
 
 identlist: Ident ',' identlist
-        | Ident
+        | Ident;
-        | ;
 
 decl: type ':' identlist { DEBUG("Declaration"); };