color? ( object -- ? )

Vocabulary

colors

Inputs and outputs

object	an object
?	a boolean

Word description

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

Definition

USING: classes.tuple.private colors.lch colors.ryb colors.xyy
colors.yiq colors.yuv kernel slots.private ;

IN: colors

: color? ( object -- ? )
    dup tuple? [
        layout-of
        7
        slot
        dup
        \ yuva
        eq?
        [ drop t ]
        [
            dup \ yiqa eq?
            [ drop t ] [
                dup \ xyYa eq?
                [ drop t ] [
                    dup \ ryba eq?
                    [ drop t ] [
                        dup \ LCHab eq?
                        ~quotation~ ~quotation~ if
                    ] if
                ] if
            ] if
        ]
        if
    ] [ drop f ] if ;