// Foundation for Sites by ZURB
// foundation.zurb.com
// Licensed under MIT Open Source

////
/// @group float grid
////

/// Calculates the width of a column based on a number of factors.
/// @param {Number|List} $columns
/// @returns {Number} A calculated percentage value.
@function grid-column($columns) {
    $width: 0%;

    @if type-of($columns) == 'number' {
        @if unit($columns) == '%' {
            $width: $columns;
		} @else if $columns < 1 {
            $width: percentage($columns);
		} @else {
            $width: percentage($columns / $grid-column-count);
		}
	} @else if type-of($columns) == 'list' {
        @if length($columns) != 3 {
            @error 'Wrong syntax for grid-column(). Use the format "n of n".';
		} @else {
            $width: percentage(nth($columns, 1) / nth($columns, 3));
        }
	} @else {
        @error 'Wrong syntax for grid-column(). Use a number, decimal, percentage, or "n of n".';
	}

    @return $width;
}

/// Creates a grid column.
///
/// @param {Mixed} $columns [$grid-column-count] - Width of the column. Refer to the `grid-column()` function to see possible values.
/// @param {Mixed} $gutters [$grid-column-gutter] - Spacing between columns. Refer to the `grid-column-gutter()` function to see possible values.
@mixin grid-column($columns: $grid-column-count, $gutters: $grid-column-gutter) {
    @include grid-column-size($columns);
    float: $global-left;
    @include grid-column-gutter($gutters: $gutters);

    @if $grid-column-align-edge {
        &:last-child:not(:first-child) {
            float: $global-right;
        }
    }
}

/// Creates a grid column row. This is the equivalent of adding `.row` and `.column` to the same element.
///
/// @param {Mixed} $gutters [$grid-column-gutter] - Width of the gutters on either side of the column row. Refer to the `grid-column-gutter()` function to see possible values.
@mixin grid-column-row($gutters: $grid-column-gutter) {
    @include grid-row;
    @include grid-column($gutters: $gutters);

    &, &:last-child {
        float: none;
	}
}

/// Shorthand for `grid-column()`.
/// @alias grid-column
@function grid-col($columns: $grid-column-count) {
    @return grid-column($columns);
}

/// Shorthand for `grid-column()`.
/// @alias grid-column
@mixin grid-col($columns: $grid-column-count, $gutters: $grid-column-gutter) {
    @include grid-column($columns, $gutters);
}

/// Shorthand for `grid-column-row()`.
/// @alias grid-column-row
@mixin grid-col-row($gutters: $grid-column-gutter) {
    @include grid-column-row($gutters);
}