68 lines
1.8 KiB
Factor
68 lines
1.8 KiB
Factor
! Copyright (C) 2007 Slava Pestov, Daniel Ehrenberg.
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! See http://factorcode.org/license.txt for BSD license.
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USING: kernel hashtables sequences arrays words namespaces make
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parser math assocs effects definitions quotations summary
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accessors ;
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IN: memoize
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: packer ( n -- quot )
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{ [ f ] [ ] [ 2array ] [ 3array ] [ 4array ] } nth ;
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: unpacker ( n -- quot )
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{ [ drop ] [ ] [ first2 ] [ first3 ] [ first4 ] } nth ;
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: #in ( word -- n )
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stack-effect in>> length ;
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: #out ( word -- n )
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stack-effect out>> length ;
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: pack/unpack ( quot word -- newquot )
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[ dup #in unpacker % swap % #out packer % ] [ ] make ;
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: make-memoizer ( quot word -- quot )
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[
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[ #in packer % ] keep
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[ "memoize" word-prop , ] keep
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[ pack/unpack , ] keep
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\ cache ,
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#out unpacker %
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] [ ] make ;
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ERROR: too-many-arguments ;
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M: too-many-arguments summary
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drop "There must be no more than 4 input and 4 output arguments" ;
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: check-memoized ( word -- )
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dup #in 4 > swap #out 4 > or [ too-many-arguments ] when ;
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: define-memoized ( word quot -- )
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over check-memoized
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2dup "memo-quot" set-word-prop
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over H{ } clone "memoize" set-word-prop
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over make-memoizer define ;
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: MEMO: (:) define-memoized ; parsing
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PREDICATE: memoized < word "memoize" word-prop ;
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M: memoized definer drop \ MEMO: \ ; ;
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M: memoized definition "memo-quot" word-prop ;
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M: memoized reset-word
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[ call-next-method ]
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[ { "memoize" "memo-quot" } reset-props ]
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bi ;
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: memoize-quot ( quot effect -- memo-quot )
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gensym swap dupd "declared-effect" set-word-prop
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dup rot define-memoized 1quotation ;
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: reset-memoized ( word -- )
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"memoize" word-prop clear-assoc ;
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: invalidate-memoized ( inputs... word -- )
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[ #in packer call ] [ "memoize" word-prop delete-at ] bi ;
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