/* Functions
 */

@function strip-unit($num) {
  @return $num / ($num * 0 + 1);
}

@function convert-to-em($value)  {
  $value: strip-unit($value) / strip-unit($em-base) * 1em;
  @if ($value == 0em) { $value: 0; }
  @return $value;
}

@function em-calc($values) {
  $max: length($values);
  @if $max == 1 { @return convert-to-em(nth($values, 1)); }
  $em-values: ();
  @for $i from 1 through $max {
    $em-values: append($em-values, convert-to-em(nth($values, $i)));
  }
  @return $em-values;
}

@function convert-to-rem($value)  {
  $value: strip-unit($value) / strip-unit($em-base) * 1rem;
  @if ($value == 0rem) { $value: 0; }
  @return $value;
}

@function rem-calc($values) {
  $max: length($values);
  @if $max == 1 { @return convert-to-rem(nth($values, 1)); }
  $rem-values: ();
  @for $i from 1 through $max {
    $rem-values: append($rem-values, convert-to-rem(nth($values, $i)));
  }
  @return $rem-values;
}

@function convert-to-px($value)  {
  $value: strip-unit($value) * 1px;
  @if ($value == 0px) { $value: 0; }
  @return $value;
}

@function px-calc($values) {
  $max: length($values);
  @if $max == 1 { @return convert-to-px(nth($values, 1)); }
  $px-values: ();
  @for $i from 1 through $max {
    $px-values: append($px-values, convert-to-px(nth($values, $i)));
  }
  @return $px-values;
}

@function size($value) {
  @if $size-unit == px {
    @return px-calc($value)
  }
  @if $size-unit == rem {
    @return rem-calc($value)
  }
  @if $size-unit == em {
    @return em-calc($value)
  }
}