normalize margin and padding values (e.g: normalize-space(13px 0px 13px 0px). returns 13px 0 )

normalize-space

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


// normalize margin and padding values (e.g: normalize-space(13px 5px 13px 5px). returns 13px 5px).
@function normalize-space($_values, $_flip-if-rtl: false, $_dir: ltr) {
  $len: length($_values);

  $a: false;// all
  $h: false;// horizontal
  $v: false;// vertical

  $t: 0;// top
  $e: 0;// end (right in ltr)
  $b: 0;// bottom
  $s: 0;// start (left in ltr)

  @if ($len == 1) {
    $t: nth($_values, 1);
    $e: $t;
    $b: $t;
    $s: $t;
  }
  @else if ($len == 2) {
    $t: nth($_values, 1);
    $e: nth($_values, 2);
    $b: $t;
    $s: $e;
  }
  @else if ($len == 3) {
    $t: nth($_values, 1);
    $e: nth($_values, 2);
    $b: nth($_values, 3);
    $s: $e;
  }
  @else if ($len == 4) {
    $t: nth($_values, 1);
    $e: nth($_values, 2);
    $b: nth($_values, 3);
    $s: nth($_values, 4);
  }


  @if ($_flip-if-rtl) and ($_dir == rtl) {
    $temp: $e;
    $e: $s;
    $s: $temp;
  }


  $v: if($t == $b, $b, false);
  $h: if($e == $s, $s, false);

  $a: if($v == $h, $h, false);

  $t: if( $t and (strip-unit($t) == 0), 0, $t);
  $e: if( $e and (strip-unit($e) == 0), 0, $e);
  $b: if( $b and (strip-unit($b) == 0), 0, $b);
  $s: if( $s and (strip-unit($s) == 0), 0, $s);
  $v: if( $v and (strip-unit($v) == 0), 0, $v);
  $h: if( $h and (strip-unit($h) == 0), 0, $h);
  $a: if( $a and (strip-unit($a) == 0), 0, $a);



  $normalized-space: false;

  @if ($a) {
    $normalized-space: $a;
  }
  @else {
    @if ($h) {
      @if ($v) {
        $normalized-space: $v $h;
      }
      @else {
        $normalized-space: $t $h $b;
      }
    }
    @else {
      $normalized-space: $t $e $b $s;
    }
  }

  @return $normalized-space;
}