1 ! (c)2009 Joe Groff bsd license
2 USING: accessors arrays classes classes.mixin classes.parser
3 classes.tuple classes.tuple.parser combinators
4 combinators.short-circuit kernel lexer make parser sequences
8 ERROR: role-slot-overlap class slots ;
9 ERROR: multiple-inheritance-attempted classes ;
11 PREDICATE: role < mixin-class
12 "role-slots" word-prop >boolean ;
14 : parse-role-definition ( -- class superroles slots )
17 { "<" [ scan-word 1array [ parse-tuple-slots ] { } make ] }
18 { "<{" [ \ } parse-until >array [ parse-tuple-slots ] { } make ] }
19 [ { } swap [ parse-slot-name [ parse-tuple-slots ] when ] { } make ]
22 : slot-name ( name/array -- name )
23 dup string? [ ] [ first ] if ;
24 : slot-names ( array -- names )
27 : role-slots ( role -- slots )
28 [ "superroles" word-prop [ role-slots ] map concat ]
29 [ "role-slots" word-prop ] bi append ;
31 : role-or-tuple-slot-names ( role-or-tuple -- names )
33 [ role-slots slot-names ]
34 [ all-slots [ name>> ] map ] if ;
36 : check-for-slot-overlap ( class roles-and-superclass slots -- )
37 [ [ role-or-tuple-slot-names ] map concat ] [ slot-names ] bi* append
38 duplicates dup empty? [ 2drop ] [ role-slot-overlap ] if ;
40 : roles>slots ( roles-and-superclass slots -- superclass slots' )
46 [ drop multiple-inheritance-attempted ]
48 swap [ role-slots ] map concat
51 : add-to-roles ( class roles -- )
52 [ add-mixin-instance ] with each ;
54 : (define-role) ( class superroles slots -- )
55 [ "superroles" set-word-prop ] [ "role-slots" set-word-prop ] bi-curry*
56 [ define-mixin-class ] tri ;
58 : define-role ( class superroles slots -- )
59 [ check-for-slot-overlap ] [ (define-role) ] [ drop add-to-roles ] 3tri ;
61 : define-tuple-class-with-roles ( class roles-and-superclass slots -- )
62 [ check-for-slot-overlap ]
63 [ roles>slots define-tuple-class ]
64 [ drop [ role? ] filter add-to-roles ] 3tri ;
66 SYNTAX: ROLE: parse-role-definition define-role ;
67 SYNTAX: TUPLE: parse-role-definition define-tuple-class-with-roles ;