/// Converts numerical string vlaues with units into legit scss-> css values. No scientific notation numbers support yet ///

@function to-number($string) {
    /// Storing all legal data ///
    $numbers: ('0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9);
    $units: ('px': 1px, 'cm': 1cm, 'mm': 1mm, '%': 1%, 'ch': 1ch, 'pc': 1pc, 'in': 1in, 'em': 1em,
    	    'rem': 1rem, 'pt': 1pt, 'ex': 1ex, 'vw': 1vw, 'vh': 1vh, 'vmin': 1vmin, 'vmax': 1vmax);
    /// Presetting vars ///
    $unit: 1;
    $minus: false;
    $divide: false;
    $result: 0;
    /// Parsing string by one char at a time ///
    @for $i from 1 through str-length($string) {
        $character: str-slice($string, $i, $i);
        $number: 0;
        /// Branching off wether its a number- OR other symbol- string ///
        @if map-has-key($numbers, $character) {
        	$number: map-get($numbers, $character);
        } @else {
        	/// Negative symbol, with decimals OR sth else ///
        	@if $character == '-' {
        		$minus: true;
        	} @else if $character == '.' {
        		$divide: 1;
        	} @else {
                /// Either a unit of measure=located at the end with possibly more chars  OR illegal char=warning ///
        		$key: str-slice($string, $i);
        		@if map-has-key($units, $key) {
        			$unit: map-get($units, $key);
        		} @else {
        	            @warn "Unknown character `#{$character}`. \
        			           -location string --> `#{$string}`   \
        			           -index position --> `#{str-index($string, $character)}`";
                        @return false;
        		}
        	}
        }
        /// Adding numbers moving to the left of '.' (2.0 -> 25.0 -> 257.0 -> ...) ///
    	@if not $divide {
    		$result: ($result * 10) + $number;
    	} @else {
    		/// On initial spotting of '.' we have to ignore the to-right-movement as we not yet add a number ///
    		@if $character != '.' {
    			/// Moving to the right of '.' (0.2 -> 0.25 -> 0.257 -> ...) ///
    			$divide: $divide * 10;
    		}
    		/// Since we are past '.' and move to the right, we can only divide further when adding new numbers ///
    		$result: $result + ($number / $divide);
    	}
    }
    /// If true, negates the value, OR leaves it unchaged otherwise ///
    $result: if($minus, - $result, $result);
    /// At last applying units, default=1 OR from $units map ///
    @return ($result * $unit);
}