Compass Box Shadow

=box-shadow($shadow-1: default, $shadow-2: false, $shadow-3: false, $shadow-4: false, $shadow-5: false, $shadow-6: false, $shadow-7: false, $shadow-8: false, $shadow-9: false, $shadow-10: false)
  // This has to be on a single line due to a bug in the scss parser: https://github.com/nex3/sass/issues/issue/26
  $legacy: type-of($shadow-1) == color and type-of(if($shadow-2, $shadow-2, 0)) == number and type-of(if($shadow-3, $shadow-3, 0)) == number and type-of(if($shadow-4, $shadow-4, 0)) == number and type-of(if($shadow-5, $shadow-5, 0)) == number and ($shadow-6 == inset or type-of($shadow-6) == bool) and ($shadow-2 or $shadow-3 or $shadow-4 or $shadow-5 or $shadow-6)
  @if $legacy
    @warn "Passing separate arguments for a single shadow to box-shadow is deprecated. " + "Pass the values as a single space-separated list, or use the single-box-shadow mixin. " + "See http://beta.compass-style.org/help/tutorials/upgrading/antares/ for more info."
    +single-box-shadow(if($shadow-1, $shadow-1, $default-box-shadow-color), if($shadow-2, $shadow-2, $default-box-shadow-h-offset), if($shadow-3, $shadow-3, $default-box-shadow-v-offset), if($shadow-4, $shadow-4, $default-box-shadow-blur), if($shadow-5, $shadow-5, $default-box-shadow-spread), if($shadow-6, $shadow-6, $default-box-shadow-inset))
  @else
    @else if $shadow-1 == default
      $shadow-1: -compass-space-list(compact(if($default-box-shadow-inset, inset, false), $default-box-shadow-h-offset, $default-box-shadow-v-offset, $default-box-shadow-blur, $default-box-shadow-spread, $default-box-shadow-color))
    $shadow: compact($shadow-1, $shadow-2, $shadow-3, $shadow-4, $shadow-5, $shadow-6, $shadow-7, $shadow-8, $shadow-9, $shadow-10)
    +experimental(box-shadow, $shadow, -moz, -webkit, -o, not -ms, not -khtml, official)

@mixin box-shadow($shadow-1: default, $shadow-2: false, $shadow-3: false, $shadow-4: false, $shadow-5: false, $shadow-6: false, $shadow-7: false, $shadow-8: false, $shadow-9: false, $shadow-10: false) {
  // This has to be on a single line due to a bug in the scss parser: https://github.com/nex3/sass/issues/issue/26
  $legacy: type-of($shadow-1) == color and type-of(if($shadow-2, $shadow-2, 0)) == number and type-of(if($shadow-3, $shadow-3, 0)) == number and type-of(if($shadow-4, $shadow-4, 0)) == number and type-of(if($shadow-5, $shadow-5, 0)) == number and ($shadow-6 == inset or type-of($shadow-6) == bool) and ($shadow-2 or $shadow-3 or $shadow-4 or $shadow-5 or $shadow-6);
  @if $legacy {
    @warn "Passing separate arguments for a single shadow to box-shadow is deprecated. " + "Pass the values as a single space-separated list, or use the single-box-shadow mixin. " + "See http://beta.compass-style.org/help/tutorials/upgrading/antares/ for more info.";
    @include single-box-shadow(if($shadow-1, $shadow-1, $default-box-shadow-color), if($shadow-2, $shadow-2, $default-box-shadow-h-offset), if($shadow-3, $shadow-3, $default-box-shadow-v-offset), if($shadow-4, $shadow-4, $default-box-shadow-blur), if($shadow-5, $shadow-5, $default-box-shadow-spread), if($shadow-6, $shadow-6, $default-box-shadow-inset)); }
  @else {
    @else if $shadow-1 == default {
      $shadow-1: -compass-space-list(compact(if($default-box-shadow-inset, inset, false), $default-box-shadow-h-offset, $default-box-shadow-v-offset, $default-box-shadow-blur, $default-box-shadow-spread, $default-box-shadow-color)); }
    $shadow: compact($shadow-1, $shadow-2, $shadow-3, $shadow-4, $shadow-5, $shadow-6, $shadow-7, $shadow-8, $shadow-9, $shadow-10);
    @include experimental(box-shadow, $shadow, -moz, -webkit, -o, not -ms, not -khtml, official); } }

=single-box-shadow($color: $default-box-shadow-color, $hoff: $default-box-shadow-h-offset, $voff: $default-box-shadow-v-offset, $blur: $default-box-shadow-blur, $spread: $default-box-shadow-spread, $inset: $default-box-shadow-inset)
  @if not ($inset == true or $inset == false or $inset == inset)
    @warn "$inset expected to be true or the inset keyword. Got #{$inset} instead. Using: inset"
  @if $color == none
    +box-shadow(none)
  @else
    $full: $hoff $voff
    @else if $blur
      $full: $full $blur
    @if $spread
      $full: $full $spread
    @if $color
      $full: $full $color
    @if $inset
      $full: inset $full
    +box-shadow($full)

@mixin single-box-shadow($color: $default-box-shadow-color, $hoff: $default-box-shadow-h-offset, $voff: $default-box-shadow-v-offset, $blur: $default-box-shadow-blur, $spread: $default-box-shadow-spread, $inset: $default-box-shadow-inset) {
  @if not ($inset == true or $inset == false or $inset == inset) {
    @warn "$inset expected to be true or the inset keyword. Got #{$inset} instead. Using: inset"; }
  @if $color == none {
    @include box-shadow(none); }
  @else {
    $full: $hoff $voff;
    @else if $blur {
      $full: $full $blur; }
    @if $spread {
      $full: $full $spread; }
    @if $color {
      $full: $full $color; }
    @if $inset {
      $full: inset $full; }
    @include box-shadow($full); } }