! (c)2010 Joe Groff bsd license
-USING: accessors definitions fry kernel locals.types namespaces parser
-see sequences words ;
+USING: accessors arrays combinators definitions fry kernel
+locals.types namespaces parser quotations see sequences slots
+words ;
+FROM: kernel.private => declare ;
FROM: help.markup.private => link-effect? ;
IN: variables
M: variable link-effect? drop f ;
M: variable print-stack-effect? drop f ;
+PREDICATE: typed-variable < variable
+ "variable-type" word-prop ;
+
+: [typed-getter] ( quot type -- quot )
+ 1array '[ @ _ declare ] ;
+: [typed-setter] ( quot type -- quot )
+ instance-check-quot prepose ;
+
+: define-typed-variable ( word type -- )
+ dupd {
+ [ [ [variable-getter] ] dip [typed-getter] ]
+ [ [ [variable-setter] ] dip [typed-setter] ]
+ [ "variable-type" set-word-prop ]
+ [ initial-value swap set-global ]
+ } 2cleave (define-variable) ;
+
+SYNTAX: TYPED-VAR:
+ CREATE-WORD scan-object define-typed-variable ;
+
+M: typed-variable definer drop \ TYPED-VAR: f ;
+M: typed-variable definition "variable-type" word-prop 1quotation ;
+
TUPLE: global-box value ;
PREDICATE: global-variable < variable
- "variable-setter" word-prop def>> first global-box? ;
+ def>> first global-box? ;
: [global-getter] ( box -- quot )
'[ _ value>> ] ;
M: global-variable definer drop \ GLOBAL: f ;
+INTERSECTION: typed-global-variable
+ global-variable typed-variable ;
+
+: define-typed-global ( word type -- )
+ 2dup "variable-type" set-word-prop
+ dup initial-value global-box boa swap
+ [ [ [global-getter] ] dip [typed-getter] ]
+ [ [ [global-setter] ] dip [typed-setter] ] 2bi (define-variable) ;
+
+SYNTAX: TYPED-GLOBAL:
+ CREATE-WORD scan-object define-typed-global ;
+
+M: typed-global-variable definer drop \ TYPED-GLOBAL: f ;
+