factor/basis/stack-checker/transforms/transforms.factor

! Copyright (C) 2007, 2009 Slava Pestov.
! See http://factorcode.org/license.txt for BSD license.
USING: fry accessors arrays kernel words sequences generic math
namespaces make quotations assocs combinators classes.tuple
classes.tuple.private effects summary hashtables classes generic
sets definitions generic.standard slots.private continuations locals
generalizations stack-checker.backend stack-checker.state
stack-checker.visitor stack-checker.errors stack-checker.values
stack-checker.recursive-state ;
IN: stack-checker.transforms

: give-up-transform ( word -- )
    {
        { [ dup "inferred-effect" word-prop ] [ cached-infer ] }
        { [ dup recursive-word? ] [ call-recursive-word ] }
        [ dup infer-word apply-word/effect ]
    } cond ;

:: ((apply-transform)) ( word quot values stack rstate -- )
    rstate recursive-state
    [ stack quot with-datastack first ] with-variable
    [
        word inlined-dependency depends-on
        values [ length meta-d shorten-by ] [ #drop, ] bi
        rstate infer-quot
    ] [ word give-up-transform ] if* ;

: literals? ( values -- ? ) [ literal-value? ] all? ;

: (apply-transform) ( word quot n -- )
    ensure-d dup literals? [
        dup empty? [ dup recursive-state get ] [
            [ ]
            [ [ literal value>> ] map ]
            [ first literal recursion>> ] tri
        ] if
        ((apply-transform))
    ] [ 2drop give-up-transform ] if ;

: apply-transform ( word -- )
    [ ] [ "transform-quot" word-prop ] [ "transform-n" word-prop ] tri
    (apply-transform) ;

: apply-macro ( word -- )
    [ ] [ "macro" word-prop ] [ "declared-effect" word-prop in>> length ] tri
    (apply-transform) ;

: define-transform ( word quot n -- )
    [ drop "transform-quot" set-word-prop ]
    [ nip "transform-n" set-word-prop ]
    3bi ;

! Combinators
\ cond [ cond>quot ] 1 define-transform

\ case [
    [
        [ no-case ]
    ] [
        dup peek callable? [
            dup peek swap but-last
        ] [
            [ no-case ] swap
        ] if case>quot
    ] if-empty
] 1 define-transform

\ cleave [ cleave>quot ] 1 define-transform

\ 2cleave [ 2cleave>quot ] 1 define-transform

\ 3cleave [ 3cleave>quot ] 1 define-transform

\ spread [ spread>quot ] 1 define-transform

\ (call-next-method) [
    [
        [ "method-class" word-prop ]
        [ "method-generic" word-prop ] bi
        [ inlined-dependency depends-on ] bi@
    ] [
        [ next-method-quot ]
        [ '[ _ no-next-method ] ] bi or
    ] bi
] 1 define-transform

! Constructors
\ boa [
    dup tuple-class? [
        dup inlined-dependency depends-on
        [ "boa-check" word-prop [ ] or ]
        [ tuple-layout '[ _ <tuple-boa> ] ]
        bi append
    ] [ drop f ] if
] 1 define-transform

\ new [
    dup tuple-class? [
        dup inlined-dependency depends-on
        [
            [ all-slots [ initial>> literalize , ] each ]
            [ literalize , ] bi
            \ boa ,
        ] [ ] make
    ] [ drop f ] if
] 1 define-transform

! Membership testing
CONSTANT: bit-member-n 256

: bit-member? ( seq -- ? )
    #! Can we use a fast byte array test here?
    {
        { [ dup length 8 < ] [ f ] }
        { [ dup [ integer? not ] any? ] [ f ] }
        { [ dup [ 0 < ] any? ] [ f ] }
        { [ dup [ bit-member-n >= ] any? ] [ f ] }
        [ t ]
    } cond nip ;

: bit-member-seq ( seq -- flags )
    bit-member-n swap [ member? 1 0 ? ] curry B{ } map-as ;

: exact-float? ( f -- ? )
    dup float? [ dup >integer >float = ] [ drop f ] if ; inline

: bit-member-quot ( seq -- newquot )
    [
        bit-member-seq ,
        [
            {
                { [ over fixnum? ] [ ?nth 1 eq? ] }
                { [ over bignum? ] [ ?nth 1 eq? ] }
                { [ over exact-float? ] [ ?nth 1 eq? ] }
                [ 2drop f ]
            } cond
        ] %
    ] [ ] make ;

: member-quot ( seq -- newquot )
    dup bit-member? [
        bit-member-quot
    ] [
        [ literalize [ t ] ] { } map>assoc
        [ drop f ] suffix [ case ] curry
    ] if ;

\ member? [
    dup sequence? [ member-quot ] [ drop f ] if
] 1 define-transform

: memq-quot ( seq -- newquot )
    [ [ dupd eq? ] curry [ drop t ] ] { } map>assoc
    [ drop f ] suffix [ cond ] curry ;

\ memq? [
    dup sequence? [ memq-quot ] [ drop f ] if
] 1 define-transform

! Shuffling
: nths-quot ( indices -- quot )
    [ [ '[ _ swap nth ] ] map ] [ length ] bi
    '[ _ cleave _ narray ] ;

\ shuffle [
    shuffle-mapping nths-quot
] 1 define-transform