@mixin transition($transition...) {
    @if $enable-transitions {
        transition: $transition;
    }
}

// Functions

@function const($const) {
    @return map-get($constants, $const);
}

@function color($color) {
    @return map-get($colors, $color);
}

@function light($color) {
    @return map-get($light-colors, $color);
}

@function dark($color) {
    @return map-get($dark-colors, $color);
}

@function theme-is($type) {
    @if $type == "kendo" {
        @return str-index($theme-variant, '#{$type}-') == 1;
    }

    @return $type == $theme-variant;
}

@function mode-get($mode, $color) {
    @if $mode == light {
        @return map-get($light-colors, $color);
    }

    @return map-get($dark-colors, $color);
}

@function rem-to-dip($size) {
    @if unit($size) != 'em' or unit($size) != 'rem' {
        @return $size / ($size * 0 + 1);
    }

    $value: $size * 15;

    @return round($value);
}

@function filter-by-text($list, $starts, $excludes, $recursive: false) {
    $result: ();

    @for $i from 1 through length($list) {
        @if type-of(nth($list, $i)) == list and $recursive {
            $result: append($result, filter-by-text(nth($list, $i), $starts, $recursive));
        } @else if str-index(nth($list, $i), $starts) == 1 {
            $result: append($result, nth($list, $i));
        }
    }

    @return $result;
}

@function filter-selectors($selectors, $compat: false) {
    @return filter-by-text($selectors, \., \.nt-);
}

@function check-contrast($color) {
    $color-brightness: round((red($color) * 299) + (green($color) * 587) + (blue($color) * 114) / 1000);
    $light-color: round((red(#ffffff) * 299) + (green(#ffffff) * 587) + (blue(#ffffff) * 114) / 1000);

    @return abs($color-brightness) < ($light-color / 1.7);
}

@function alternate($color, $contrast: 60%, $decontrast: null) {
    $decontrast: if($decontrast != null, $decontrast, $contrast);

    @return adjust-color($color, $lightness: if(check-contrast($color), $contrast, -$decontrast));
}

@function scale-alternate($color, $contrast: 60%, $decontrast: null) {
    $decontrast: if($decontrast != null, $decontrast, $contrast);

    @return scale-color($color, $lightness: if(check-contrast($color), $contrast, -$decontrast));
}

@function contrasted($color, $to-color, $contrast: 60%, $decontrast: null) {
    $decontrast: if($decontrast != null, $decontrast, $contrast);

    @return adjust-color($color, $lightness: if(check-contrast($to-color), $contrast, -$decontrast));
}

@function scale-contrasted($color, $to-color, $contrast: 60%, $decontrast: null) {
    $decontrast: if($decontrast != null, $decontrast, $contrast);

    @return scale-color($color, $lightness: if(check-contrast($to-color), $contrast, -$decontrast));
}

@function slice($list, $start: 1, $end: length($list)) {
    $result: ();

    @if ($start > $end) {
        @return $result;
    }

    @for $i from $start through $end {
        $result: append($result, nth($list, $i));
    }

    @return $result;
}