1 ! Copyright (C) 2009 Joe Groff.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: accessors arrays classes classes.mixin classes.parser
4 classes.tuple classes.tuple.parser combinators
5 combinators.short-circuit kernel lexer make parser sequences
9 ERROR: role-slot-overlap class slots ;
10 ERROR: multiple-inheritance-attempted classes ;
12 PREDICATE: role < mixin-class
13 "role-slots" word-prop >boolean ;
15 : parse-role-definition ( -- class superroles slots )
16 scan-new-class scan-token {
18 { "<" [ scan-word 1array [ parse-tuple-slots ] { } make ] }
19 { "<{" [ \ } parse-until >array [ parse-tuple-slots ] { } make ] }
20 [ { } swap [ parse-slot-name [ parse-tuple-slots ] when ] { } make ]
23 : slot-name ( name/array -- name )
24 dup string? [ first ] unless ;
26 : slot-names ( array -- names )
29 : role-slots ( role -- slots )
30 [ "superroles" word-prop [ role-slots ] map concat ]
31 [ "role-slots" word-prop ] bi append ;
33 : role-or-tuple-slot-names ( role-or-tuple -- names )
35 [ role-slots slot-names ]
36 [ all-slots [ name>> ] map ] if ;
38 : check-for-slot-overlap ( class roles-and-superclass slots -- )
39 [ [ role-or-tuple-slot-names ] map concat ] [ slot-names ] bi* append
40 duplicates dup empty? [ 2drop ] [ role-slot-overlap ] if ;
42 : roles>slots ( roles-and-superclass slots -- superclass slots' )
48 [ drop multiple-inheritance-attempted ]
50 swap [ role-slots ] map concat
53 : add-to-roles ( class roles -- )
54 [ add-mixin-instance ] with each ;
56 : (define-role) ( class superroles slots -- )
57 [ "superroles" set-word-prop ] [ "role-slots" set-word-prop ] bi-curry*
58 [ define-mixin-class ] tri ;
60 : define-role ( class superroles slots -- )
61 [ check-for-slot-overlap ] [ (define-role) ] [ drop add-to-roles ] 3tri ;
63 : define-tuple-class-with-roles ( class roles-and-superclass slots -- )
64 [ check-for-slot-overlap ]
65 [ roles>slots define-tuple-class ]
66 [ drop [ role? ] filter add-to-roles ] 3tri ;
68 SYNTAX: ROLE: parse-role-definition define-role ;
69 SYNTAX: ROLE-TUPLE: parse-role-definition define-tuple-class-with-roles ;