.loop (@style-name, @tag-name, @i,@base-size, @max:10,@xy:none) when (@i <= @max) {
  @next: @i+1;
  .fn() when (@xy =none) {
    @size: @base-size * @i;

    .@{style-name}-@{i} {
      @{tag-name}: ~'@{size}px ';
    }
    .loop(@style-name, @tag-name, @next, @base-size, @max, @xy);
  }

  .fn() when (@xy =x) {
    @size: @base-size * @i;

    @tnl: ~'@{tag-name}-left';
    @tnr: ~'@{tag-name}-right';

    .@{style-name}-@{i} {
      @{tnl}: ~'@{size}px';
      @{tnr}: ~'@{size}px';
    }
    .loop(@style-name, @tag-name, @next, @base-size, @max, @xy);
  }
  .fn() when (@xy =y) {
    @size: @base-size * @i;

    @tnt: ~'@{tag-name}-top';
    @tnb: ~'@{tag-name}-bottom';

    .@{style-name}-@{i} {
      @{tnt}: ~'@{size}px';
      @{tnb}: ~'@{size}px';
    }
    .loop(@style-name, @tag-name, @next, @base-size, @max, @xy);
  }
  .fn() when (@xy =auto) {
    @tnt: ~'@{tag-name}-top';
    @tnb: ~'@{tag-name}-bottom';
    @tnl: ~'@{tag-name}-left';
    @tnr: ~'@{tag-name}-right';
    .@{style-name} {
      @{tnl}: ~'auto';
      @{tnr}: ~'auto';
      @{tnt}: ~'auto';
      @{tnb}: ~'auto';
    }
  }

  .fn() when (@xy =autoX) {
    @tnl: ~'@{tag-name}-left';
    @tnr: ~'@{tag-name}-right';
    .@{style-name} {
      @{tnl}: ~'auto';
      @{tnr}: ~'auto';
    }
  }

  .fn() when (@xy =autoY) {
    @tnt: ~'@{tag-name}-top';
    @tnb: ~'@{tag-name}-bottom';
    .@{style-name} {
      @{tnt}: ~'auto';
      @{tnb}: ~'auto';
    }
  }
  .fn();
}