RTL text direction function

SassMeister-input.scss

// ----
// Sass (v3.4.7)
// Compass (v1.0.1)
// ----

$dir: rtl;

@function shorthand($values) {
  @return if($dir != rtl, $values, nth($values,1) nth($values,4) nth($values,3) nth($values,2));
}

@function opposite($value) {
  $opposites: (left: right, right: left);
  @return if($dir != rtl, $value, map-get($opposites, $value));
}

@mixin if-rtl {
  @if $dir == rtl {
    @content;
  }
}

html {
  direction: $dir; unicode-bidi: embed;
}

img {
  margin: shorthand(11px 0 0 21px);
  max-width: 100%;
}

h1 {
  float: opposite(left);
}

h2 {
  padding: shorthand(10px 30px 10px 50px);
}

section {
  margin-#{opposite(right)}: 50px;
}

#menu li.marker {
  width: 10px;
  height: 10px;

  @include if-rtl {
    -webkit-transform: rotate(180deg);
    transform: rotate(180deg);
  }
}

SassMeister-output.css

html {
  direction: rtl;
  unicode-bidi: embed;
}

img {
  margin: 11px 21px 0 0;
  max-width: 100%;
}

h1 {
  float: right;
}

h2 {
  padding: 10px 50px 10px 30px;
}

section {
  margin-left: 50px;
}

#menu li.marker {
  width: 10px;
  height: 10px;
  -webkit-transform: rotate(180deg);
  transform: rotate(180deg);
}