@mixin fn($space,$direction,$size,$n) {
  @if $n {
    #{$space}-#{$direction}: #{$size*$uni-space-root}px
  } @else {
    #{$space}-#{$direction}: #{-$size*$uni-space-root}px
  }
}

@mixin get-styles($direction,$i,$space,$n) {
  @if $direction == t {
    @include fn($space, top, $i, $n);
  }
  @if $direction == r {
    @include fn($space, right, $i, $n);
  }
  @if $direction == b {
    @include fn($space, bottom, $i, $n);
  }
  @if $direction == l {
    @include fn($space, left, $i, $n);
  }
  @if $direction == x {
    @include fn($space, left, $i, $n);
    @include fn($space, right, $i, $n);
  }
  @if $direction == y {
    @include fn($space, top, $i, $n);
    @include fn($space, bottom, $i, $n);
  }
  @if $direction == a {
    @if $n {
      #{$space}: #{$i*$uni-space-root}px;
    } @else {
      #{$space}: #{-$i*$uni-space-root}px;
    }
  }
}

@each $orientation in m, p {
  $space: margin;
  @if $orientation == m {
    $space: margin;
  } @else {
    $space: padding;
  }
  @for $i from 0 through 16 {
    @each $direction in t, r, b, l, x, y, a {
      .uni-#{$orientation}#{$direction}-#{$i} {
        @include get-styles($direction, $i, $space, true);
      }
      .uni-#{$orientation}#{$direction}-n#{$i} {
        @include get-styles($direction, $i, $space, false);
      }
    }
  }
}