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@KittyGiraudel
Created June 6, 2015 13:48
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// ----
// Sass (v3.4.13)
// Compass (v1.0.3)
// ----
////
/// String to number converter
/// @author Hugo Giraudel
/// @access private
////
///
/// Casts a string into a number
///
/// @param {String | Number} $value - Value to be parsed
///
/// @return {Number}
///
@function to-number($value) {
@if type-of($value) == 'number' {
@return $value;
} @else if type-of($value) != 'string' {
$_: log('Value for `to-number` should be a number or a string.');
}
$result: 0;
$digits: 0;
$minus: str-slice($value, 1, 1) == '-';
$numbers: ('0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9);
@for $i from if($minus, 2, 1) through str-length($value) {
$character: str-slice($value, $i, $i);
@if not (index(map-keys($numbers), $character) or $character == '.') {
@return to-length(if($minus, -$result, $result), str-slice($value, $i))
}
@if $character == '.' {
$digits: 1;
} @else if $digits == 0 {
$result: $result * 10 + map-get($numbers, $character);
} @else {
$digits: $digits * 10;
$result: $result + map-get($numbers, $character) / $digits;
}
}
@return if($minus, -$result, $result);;
}
///
/// Add `$unit` to `$value`
///
/// @param {Number} $value - Value to add unit to
/// @param {String} $unit - String representation of the unit
///
/// @return {Number} - `$value` expressed in `$unit`
///
@function to-length($value, $unit) {
$units: ('px': 1px, 'cm': 1cm, 'mm': 1mm, '%': 1%, 'ch': 1ch, 'pc': 1pc, 'in': 1in, 'em': 1em, 'rem': 1rem, 'pt': 1pt, 'ex': 1ex, 'vw': 1vw, 'vh': 1vh, 'vmin': 1vmin, 'vmax': 1vmax);
@if not index(map-keys($units), $unit) {
$_: log('Invalid unit `#{$unit}`.');
}
@return $value * map-get($units, $unit);
}
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