87 lines
2.6 KiB
Factor
87 lines
2.6 KiB
Factor
IN: generic
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USING: arrays errors hashtables kernel kernel-internals lists
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math namespaces sequences vectors words ;
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: picker ( dispatch# -- quot )
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{ [ dup ] [ over ] [ pick ] } nth ;
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: unpicker ( dispatch# -- quot )
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{ [ nip ] [ >r nip r> swap ] [ >r >r nip r> r> -rot ] } nth ;
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: error-method ( dispatch# word -- method )
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>r picker r> [ no-method ] curry append ;
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: empty-method ( dispatch# word -- method )
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[
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over picker % [ delegate dup ] %
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over unpicker over add ,
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[ drop ] -rot error-method append , \ if ,
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] [ ] make ;
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: class-predicates ( picker assoc -- assoc )
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[
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first2 >r >r picker r> "predicate" word-prop append
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r> 2array
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] map-with ;
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: sort-methods ( assoc n -- vtable )
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#! Input is a predicate -> method association.
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#! n is vtable size (either num-types or num-tags).
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[
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type>class [ object bootstrap-word ] unless*
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swap [ first classes-intersect? ] subset-with
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] map-with ;
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: simplify-alist ( class assoc -- default assoc )
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dup cdr [
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2dup cdr car first class< [
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cdr simplify-alist
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] [
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uncons >r second nip r>
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] if
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] [
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nip car second [ ]
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] if ;
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: vtable-methods ( dispatch# alist-seq -- alist-seq )
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dup length [
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type>class
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[ swap simplify-alist ] [ car second [ ] ] if*
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>r over r> class-predicates alist>quot
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] 2map nip ;
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: <vtable> ( dispatch# word n -- vtable )
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#! n is vtable size; either num-types or num-tags.
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>r 2dup empty-method \ object bootstrap-word swap 2array
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>r methods >list r> swons r> sort-methods vtable-methods ;
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: small-generic ( dispatch# word -- def )
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2dup empty-method object bootstrap-word swap 2array
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swap methods >list cons
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object bootstrap-word swap simplify-alist
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swapd class-predicates alist>quot ;
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: big-generic ( dispatch# word n dispatcher -- def )
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[ >r pick picker % r> , <vtable> , \ dispatch , ] [ ] make ;
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: tag-generic? ( word -- ? )
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"methods" word-prop hash-keys [ types ] map concat
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[ tag-mask < ] all? ;
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: small-generic? ( word -- ? )
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"methods" word-prop hash-size 3 <= ;
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: standard-combination ( word dispatch# -- quot )
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swap {
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{ [ dup tag-generic? ] [ num-tags \ tag big-generic ] }
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{ [ dup small-generic? ] [ small-generic ] }
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{ [ t ] [ num-types \ type big-generic ] }
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} cond ;
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: define-generic ( word -- )
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[ 0 standard-combination ] define-generic* ;
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PREDICATE: generic standard-generic
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1 swap "combination" word-prop ?nth
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\ standard-combination eq? ;
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