// Converts number[unit] string into value
// -------------------------------------------------------------------------------
// @documentation http://hugogiraudel.com/2014/01/15/sass-string-to-number/
// -------------------------------------------------------------------------------
// @param $number [string] : number
// @param $unit [string] : unit
// -------------------------------------------------------------------------------
// @return [number]

@function flint-num-length($number, $unit) {
	$strings: 'px' 'cm' 'mm' '%' 'ch' 'pica' 'in' 'em' 'rem' 'pt' 'pc' 'ex' 'vw' 'vh' 'vmin' 'vmax';
	$units:   1px  1cm  1mm  1%  1ch  1pica  1in  1em  1rem  1pt  1pc  1ex  1vw  1vh  1vmin  1vmax;
	$index: index($strings, $unit);

	@if not $index {
		@warn "Unknown unit `#{$unit}`.";
		@return false;
	}

	@return $number * nth($units, $index);
}

// Converts string to number
// -------------------------------------------------------------------------------
// @documentation http://hugogiraudel.com/2014/01/15/sass-string-to-number/
// -------------------------------------------------------------------------------
// @param $string [string] : string
// -------------------------------------------------------------------------------
// @return [number]

@function flint-to-number($string) {
	// Use Ruby function if available
	@if $flint__use-ruby-functions {
		@return string_to_number($string);
	} @else {
		// Matrices
		$strings: '0' '1' '2' '3' '4' '5' '6' '7' '8' '9';
		$numbers:  0   1   2   3   4   5   6   7   8   9;

		// Result
		$result: 0;
		$divider: 0;
		$minus: false;

		// Looping through all characters
		@for $i from 1 through str-length($string) {
			$character: str-slice($string, $i, $i);
			$index: index($strings, $character);

			@if $character == '-' {
				$minus: true;
			} @else if $character == '.' {
				$divider: 1;
			} @else {

				@if not $index {
					$result: if($minus, $result * -1, $result);
					@return flint-num-length($result, str-slice($string, $i));
				}

				$number: nth($numbers, $index);

				@if $divider == 0 {
					$result: $result * 10;
				} @else {
					// Move the decimal dot to the left
					$divider: $divider * 10;
					$number: $number / $divider;
				}

				$result: $result + $number;
			}
		}

		@return if($minus, $result * -1, $result);
	}
}