immutable-sequence? ( object -- ? )

Vocabulary

sequences

Inputs and outputs

object	an object
?	a boolean

Word description

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

Definition

USING: classes.tuple.private kernel kernel.private math.private
sequences.frozen sequences.interleaved sequences.prefixed
sequences.repeating sequences.suffixed sequences.zipped
slots.private ;

IN: sequences

: immutable-sequence? ( object -- ? )
    dup tag 1 swap fixnum-shift-fast 18 fixnum-bitand 0 eq? not
    [ drop t ] [
        dup
        tuple?
        [
            layout-of
            dup
            7
            slot
            dup
            \ zipped
            eq?
            [ drop t ]
            [
                dup \ suffixed eq?
                [ drop t ] [
                    dup \ prefixed eq?
                    [ drop t ] [
                        dup \ interleaved eq?
                        ~quotation~ ~quotation~ if
                    ] if
                ] if
            ]
            if
            [ drop t ]
            [
                dup
                1
                slot
                9
                fixnum>=
                [
                    9
                    slot
                    dup
                    \ frozen
                    eq?
                    [ drop t ]
                    [
                        dup \ element-repeats eq?
                        ~quotation~ ~curried~ if
                    ]
                    if
                ]
                [ drop f ]
                if
            ]
            if
        ]
        [ drop f ]
        if
    ] if ;