abstract-span-rule? ( object -- ? )

Vocabulary

xmode.marker

Inputs and outputs

object	an object
?	a boolean

Word description

Tests if the object is an instance of the abstract-span-rule class.

Definition

USING: classes.tuple.private kernel math.private slots.private
xmode.rules ;

IN: xmode.marker

: abstract-span-rule? ( object -- ? )
    dup tuple? [
        layout-of
        dup
        1
        slot
        9
        fixnum>=
        [
            9
            slot
            dup
            \ eol-span-rule
            eq?
            [ drop t ]
            [ \ span-rule eq? ]
            if
        ]
        [ drop f ]
        if
    ] [ drop f ] if ;