Implement basic functions (no parameters yet)

IBAF-cbs/IBAF/IBAF-Start/IBAF-Functions.cbs

@@ -0,0 +1,31 @@
+//Syntax
+//MD:
+//  method-declaration ::=
+//    'public' type identifier '(' formal-list? ')' '{' 
+//      var-declaration* 
+//      statement* 
+//      'return' expression ';' 
+//    '}'
+//
+//Type
+//  methods 
+//   ~> functions(tuples(references(objects), minijava-values*), minijava-values)
+//  
+//Semantics
+//  declare-methods[[MD*:method-declaration*]] : => envs
+//Rule
+//  declare-methods[['public' T ID '(' FL? ')' '{' VD* S* 'return' E ';' '}']] =
+//    { id[[ID]] |->
+//      function closure scope (
+//        collateral ( // variables not allowed to shadow visible fields
+//          match ( given,
+//            tuple (
+//            pattern abstraction { "this" |-> allocate-initialised-variable ( pointers(objects), given ) },
+//              bind-formals[[FL?]] 
+//              ) 
+//          ),
+//          object-single-inheritance-feature-map checked dereference first tuple-elements given, 
+//          declare-variables[[VD*]] ),
+//          
+//        sequential ( execute[[S*]], evaluate[[E]] ) ) }
+