// Text Shadow

@import "compass/support";


// These defaults make the arguments optional for this mixin
// If you like, set different defaults in your project

$default-text-shadow-color      : #aaa    !default;
$default-text-shadow-h-offset   : 0px     !default;
$default-text-shadow-v-offset   : 0px     !default;
$default-text-shadow-blur       : 1px     !default;
$default-text-shadow-spread     : false   !default;


// Provides cross-browser text shadows when one or more shadows are needed.
// Each shadow argument should adhere to the standard css3 syntax for the
// text-shadow property.
//
// Note: if any shadow has a spread parameter, this will cause the mixin
// to emit the shadow declaration twice, first without the spread,
// then with the spread included. This allows you to progressively
// enhance the browsers that do support the spread parameter.
@mixin text-shadow(
  $shadow...
) {
  $shadow: if(length($shadow) > 0, $shadow, default);
  $default: -compass-space-list(compact($default-text-shadow-h-offset $default-text-shadow-v-offset $default-text-shadow-blur $default-text-shadow-spread $default-text-shadow-color));
  $shadows-without-spread: join((),(),comma);
  $shadows: join((),(),comma);
  $has-spread: false;

  @each $layer in $shadow {
    $layer: if($layer == 'default', $default, $layer);
    @if length($layer) > 4 {
      $has-spread: true;
      $shadows-without-spread: append($shadows-without-spread, nth($layer,1) nth($layer,2) nth($layer,3) nth($layer,5));
      $shadows: append($shadows, $layer);
    } @else {
      $shadows-without-spread: append($shadows-without-spread, $layer);
      $shadows: append($shadows, $layer);
    }
  }
  @if $has-spread {
    text-shadow: $shadows-without-spread;
  }
  text-shadow: $shadows;
}

// Provides a single cross-browser CSS text shadow.
//
// Provides sensible defaults for the color, horizontal offset, vertical offset, blur, and spread
// according to the configuration defaults above.
@mixin single-text-shadow(
  $hoff: false,
  $voff: false,
  $blur: false,
  $spread: false,
  $color: false
) {
  // A lot of people think the color comes first. It doesn't.
  @if type-of($hoff) == color {
    $temp-color: $hoff;
    $hoff: $voff;
    $voff: $blur;
    $blur: $spread;
    $spread: $color;
    $color: $temp-color;
  }
  // Can't rely on default assignment with multiple supported argument orders.
  $hoff:   if($hoff,   $hoff,   $default-text-shadow-h-offset);
  $voff:   if($voff,   $voff,   $default-text-shadow-v-offset);
  $blur:   if($blur,   $blur,   $default-text-shadow-blur    );
  $spread: if($spread, $spread, $default-text-shadow-spread  );
  $color:  if($color,  $color,  $default-text-shadow-color   );
  // We don't need experimental support for this property.
  @if $color == none or $hoff == none {
    @include text-shadow(none);
  } @else {
    @include text-shadow(compact($hoff $voff $blur $spread $color));
  }
}
