// directional-scss | Author: Tyson Matanich (http://matanich.com), 2013 | License: MIT
$dir: ltr !default;

// Default $dir if not valid
@if $dir != ltr and $dir != rtl {
	$dir: ltr;
}

@function if-ltr($if, $else: null) {
	@if $dir != rtl {
		@return $if;
	}
	@else {
		@return $else;
	}
}

@function if-rtl($if, $else: null) {
	@return if-ltr($else, $if);
}

$left: if-ltr(left, right);
$right: if-ltr(right, left);

@function side-values($values) {
	@if $dir == rtl and length($values) >= 4 {
		// Reorder right and left positions in list
		@return nth($values, 1) nth($values, 4) nth($values, 3) nth($values, 2);
	}
	@else {
		@return $values;
	}
}

@function corner-values($values) {
	@if $dir == rtl and length($values) > 1 {
		// Reorder right and left positions in list
		@if length($values) == 2 {
			@return nth($values, 2) nth($values, 1);
		}
		@else if length($values) == 3 {
			@return nth($values, 2) nth($values, 1) nth($values, 2) nth($values, 3);
		}
		@else {
			@return nth($values, 2) nth($values, 1) nth($values, 4) nth($values, 3);
		}
	}
	@else {
		@return $values;
	}
}

@mixin if-ltr { 
	@if $dir != rtl {
		@content;
	}
}

@mixin if-rtl {
	@if $dir == rtl {
		@content;
	}
}