1 ! Copyright (C) 2007, 2009 Slava Pestov, Daniel Ehrenberg.
2 ! See http://factorcode.org/license.txt for BSD license.
3 USING: kernel hashtables sequences arrays words namespaces make
4 parser math assocs effects definitions quotations summary
8 ERROR: too-many-arguments ;
10 M: too-many-arguments summary
11 drop "There must be no more than 4 input and 4 output arguments" ;
15 : packer ( seq -- quot )
16 length { [ f ] [ ] [ 2array ] [ 3array ] [ 4array ] } nth ;
18 : unpacker ( seq -- quot )
19 length { [ drop ] [ ] [ first2 ] [ first3 ] [ first4 ] } nth ;
21 : pack/unpack ( quot effect -- newquot )
22 [ in>> packer ] [ out>> unpacker ] bi surround ;
24 : unpack/pack ( quot effect -- newquot )
25 [ in>> unpacker ] [ out>> packer ] bi surround ;
27 : check-memoized ( effect -- )
28 [ in>> ] [ out>> ] bi [ length 4 > ] either? [ too-many-arguments ] when ;
30 : make-memoizer ( table quot effect -- quot )
31 [ check-memoized ] keep
32 [ unpack/pack '[ _ _ cache ] ] keep
37 : define-memoized ( word quot -- )
39 [ pick stack-effect make-memoizer define ]
40 [ nip "memo-quot" set-word-prop ]
41 [ drop "memoize" set-word-prop ]
44 SYNTAX: MEMO: (:) define-memoized ;
46 PREDICATE: memoized < word "memoize" word-prop ;
48 M: memoized definer drop \ MEMO: \ ; ;
50 M: memoized definition "memo-quot" word-prop ;
52 M: memoized reset-word
54 [ { "memoize" "memo-quot" } reset-props ]
57 : memoize-quot ( quot effect -- memo-quot )
58 [ H{ } clone ] 2dip make-memoizer ;
60 : reset-memoized ( word -- )
61 "memoize" word-prop clear-assoc ;
63 : invalidate-memoized ( inputs... word -- )
64 [ stack-effect in>> packer call ] [ "memoize" word-prop delete-at ] bi ;