Sass position mixins

_positions.scss

// ----
// Sass (v3.4.14)
// Compass (v1.0.3)
// ----

@mixin pos-absolute($positions...){
  position: absolute;
  @include position($positions...);
}

@mixin pos-fixed($positions...){
  position: fixed;
  @include position($positions...);
}

@mixin position($positions...){
  $positions: parseDirections($positions);
  top: map-get($positions,'top');
  right: map-get($positions,'right');
  bottom: map-get($positions,'bottom');
  left: map-get($positions,'left');
}


@function parseDirections($directions){
  $top: 0; $bottom: 0; $left: 0; $right: 0;
    
  @if length($directions) > 0{
    $d1: nth($directions,1);
    $top: $d1; $bottom: $d1; $left: $d1; $right: $d1; 
  }@if length($directions) > 1 {
    $d2: nth($directions,2);
    $left: $d2; $right: $d2; 
  }@if length($directions) > 2 {
    $d3: nth($directions,3);
    $bottom: $d3;
  }@if length($directions) > 3 {
    $d4: nth($directions,4);
    $left: $d4
  }
  
  @return (
    top: $top,
    bottom: $bottom,
    left: $left,
    right: $right
  );
}

.test0{
  @include pos-absolute();
}
.test1{
  @include pos-absolute(10px);
}
.test2{
  @include pos-absolute(10px,20px);
}
.test3{
  @include pos-absolute(10px,20px,30px);
}
.test4{
  @include pos-absolute(10px,20px,30px,40px);
}

output.css

.test0 {
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
}

.test1 {
  position: absolute;
  top: 10px;
  right: 10px;
  bottom: 10px;
  left: 10px;
}

.test2 {
  position: absolute;
  top: 10px;
  right: 20px;
  bottom: 10px;
  left: 20px;
}

.test3 {
  position: absolute;
  top: 10px;
  right: 20px;
  bottom: 30px;
  left: 20px;
}

.test4 {
  position: absolute;
  top: 10px;
  right: 20px;
  bottom: 30px;
  left: 40px;
}