virtual-sequence? ( object -- ? )

Vocabulary

sequences

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the virtual-sequence class.

Definition

USING: classes.tuple.private kernel math.bits math.blas.vectors
math.private sequences.cords sequences.inserters
sequences.merged sequences.modified sequences.repeating
slots.private ;

IN: sequences

: virtual-sequence? ( object -- ? )
    dup dup tuple? [
        layout-of
        dup
        7
        slot
        dup
        \ offset-growable
        eq?
        [ drop t ]
        [
            dup \ cycles eq?
            [ drop t ] [
                dup \ modified eq?
                [ drop t ] [
                    dup \ blas-vector-base eq?
                    [ drop t ] [
                        dup \ merged eq?
                        ~quotation~ ~curried~ if
                    ] if
                ] if
            ] if
        ]
        if
        [ drop t ]
        [
            dup
            1
            slot
            9
            fixnum>=
            [ 9 slot \ binary-bits eq? ]
            [ drop f ]
            if
        ]
        if
    ] [ drop f ] if
    [ drop t ] [ dup cord? [ drop t ] [ wrapped-sequence? ] if ]
    if ;