_math.scss

@function ch-max($v1, $v2) {
  @return if($v1 > $v2, $v1, $v2);
}

@function ch-min($v1, $v2) {
  @return if($v1 < $v2, $v1, $v2);
}

@function ch-gcd($a, $b) {
  // From: http://rosettacode.org/wiki/Greatest_common_divisor#JavaScript
  @if ($b != 0) {
    @return ch-gcd($b, $a % $b);
  } @else {
    @return abs($a);
  }
}

@function ch-pow($base, $exponent, $prec: 12) {
  // Handles decimal exponents by trying to convert them into a fraction and then use a nthRoot-algorithm for parts of the calculation
  @if (floor($exponent) != $exponent) {
    $prec2 : ch-pow(10, $prec);
    $exponent: round($exponent * $prec2);
    $denominator: ch-gcd($exponent, $prec2);
    @return ch-nth-root(ch-pow($base, $exponent / $denominator), $prec2 / $denominator, $prec);
  }

  $value: $base;
  @if $exponent > 1 {
    @for $i from 2 through $exponent {
      $value: $value * $base;
    }
  } @else if $exponent < 1 {
    @for $i from 0 through -$exponent {
      $value: $value / $base;
    }
  }

  @return $value;
}

@function ch-nth-root($num, $n: 2, $prec: 12) {
  // From: http://rosettacode.org/wiki/Nth_root#JavaScript
  $x: 1;

  @for $i from 0 through $prec {
    $x: 1 / $n * (($n - 1) * $x + ($num / ch-pow($x, $n - 1)));
  }

  @return $x;
}