// RenderKit
// github.com/matteobertoldo/renderkit
// Licensed under MIT Open Source

////
/// @group sassy list
////

// Returns whether `$list` contains `$value`.
// @ignore Documentation: http://at-import.github.io/SassyLists/documentation/#function-sl-contain
// @param {List}    $list  - list to check
// @param {*}       $value - value to look for
// @example
// sl-contain(a b c, a)
// true
// @example
// sl-contain(a b c, z)
// false
// @return {Bool}
@function sl-contain($list, $value) {
    @return not not index($list, $value);
}

// Returns truthiness of `$value`.
// @access private
// @param {*} $value - value to check
// @return {Bool}
@function sl-is-true($value) {
    @return if($value == null, false, $value and $value != null and $value != '' and $value != ());
}

// Casts `$value` into a list.
// @ignore Documentation: http://at-import.github.io/SassyLists/documentation/#function-sl-to-list
// @param {*} $value - value to cast to list
// @param {String} $separator [space] - separator to use
// @example
// sl-to-list(a b c, comma)
// a, b, c
// @return {List}
@function sl-to-list($value, $separator: list-separator($value)) {
    @return join((), $value, $separator);
}

// Removes all false and null values from `$list`.
// @ignore Documentation: http://at-import.github.io/SassyLists/documentation/#function-sl-purge
// @requires sl-is-true
// @requires sl-to-list
// @param {List} $list - list to purge
// @example
// sl-purge(null a false b)
// a b
// @return {List}
@function sl-purge($list) {
    $result: ();

    @each $item in $list {
        @if sl-is-true($item) {
            $result: append($result, $item, list-separator($list));
        }
    }

    @return sl-to-list($result);
}

// Replaces `$old` by `$new` in `$list`.
// @ignore Documentation: http://at-import.github.io/SassyLists/documentation/#function-sl-replace
// @requires sl-is-true
// @requires sl-purge
// @requires sl-to-list
// @param {List}    $list  - list to update
// @param {*}       $old   - value to replace
// @param {*}       $value - new value for $old
// @example
// sl-replace(a b c, b, z)
// a z c
// @example
// sl-replace(a b c, y, z)
// a b c
// @return {List}
@function sl-replace($list, $old, $value) {
    $running: true;

    @while $running {
        $index: index($list, $old);

        @if not $index {
            $running: false;
        } @else {
            $list: set-nth($list, $index, $value);
        }
    }

    $list: if(sl-is-true($value), $list, sl-purge($list));

    @return sl-to-list($list);
}

// Removes value(s) `$value` from `$list`.
// @ignore Documentation: http://at-import.github.io/SassyLists/documentation/#function-sl-remove
// @requires sl-replace
// @param {List}    $list      - list to update
// @param {*}       $value     - value to remove
// @example
// sl-remove(a b c, a)
// b c
// @return {List}
@function sl-remove($list, $value) {
    @return sl-replace($list, $value, null);
}