topic? ( object -- ? )

Vocabulary

help.topics

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the topic class.

Definition

USING: classes.tuple.private help.apropos help.vocabs kernel
kernel.private math.private slots.private vocabs ;

IN: help.topics

: topic? ( object -- ? )
    dup tag 12 eq?
    [ drop t ] [
        dup
        tuple?
        [
            layout-of
            dup
            7
            slot
            dup
            \ apropos-search
            eq?
            [ drop t ]
            [
                dup \ vocab-link eq?
                [ drop t ] [
                    dup \ vocab-author eq?
                    [ drop t ] [
                        dup \ vocab-tag eq?
                        ~quotation~ ~curried~ if
                    ] if
                ] if
            ]
            if
            [ drop t ]
            [
                dup
                1
                slot
                9
                fixnum>=
                [ 9 slot \ vocab eq? ]
                [ drop f ]
                if
            ]
            if
        ]
        [ drop f ]
        if
    ] if ;