_functions.scss

//File taken from mq-sass
//https://github.com/jonsuh/mq-sass/blob/master/stylesheets/mq-sass/_functions.scss

// Strip units
// ==================================================
// Derived from Bourbon by thoughtbot (http://bourbon.io)
@function _mq-strip-units($val) {
	@return ($val / ($val * 0 + 1));
}

// Pixels to Ems
// ==================================================
// Derived from Bourbon by thoughtbot (http://bourbon.io)
@function _mq-em($pxval, $base: $mq-em-base) {
	//alteration to prevent strings from causing an error
	@if (type-of($pxval) == 'string'){
		@return $pxval;
	}

	@if not unitless($pxval) {
		$pxval: _mq-strip-units($pxval);
	}
	@if not unitless($base) {
		$base: _mq-strip-units($base);
	}
	@return ($pxval / $base) * 1em;
}

//Turn string into a number
//http://hugogiraudel.com/2014/01/15/sass-string-to-number/
@function number($string) {
	// 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;

	// Looping through all characters
	@for $i from 1 through str-length($string) {
		$character: str-slice($string, $i, $i);
		$index: index($strings, $character);
		@if not $index {
			@warn "Unknown character `#{$character}`.";
			@return false;
		}
		$number: nth($numbers, $index);
		$result: $result * 10 + $number;
	}

	@return $result;
}

//For getting the number values in ratio based ranges
@function get-start($string){
	$string: unquote($string);
	@return number( str-slice($string, 1, 1) );
}
@function get-end($string){
	$string: unquote($string);
	@return number( str-slice($string, str-length($string), str-length($string)) );
}