// Row Start & End
// ===============


// Break
// -----
// Apply to any element that should force a line break.
@mixin break {
  clear: both;
}


// NoBreak
// -------
// Cancel the break() effect, e.g. when using media queries.
@mixin nobreak {
  clear: none;
}


// Full
// ----
// - [$span]: <span settings>
@mixin full(
  $context: $susy
) {
  @include span(full of parse-grid($context) break);
}


// First
// -----
// - [$grid]: <settings>
@mixin first(
  $grid: $susy
) {
  $grid: parse-grid($grid);
  $flow: susy-get(flow, $grid);

  @if not is-split($grid) {
    @include float-first($flow);
  }
}

@mixin alpha(
  $grid: $susy
) {
  @include first($grid);
}


// Last
// ----
// - [$grid]: <settings>
@mixin last(
  $grid: $susy
) {
  $grid: parse-grid($grid);
  $output: (
    flow: susy-get(flow, $grid),
    margin: if(is-split($grid), gutters($grid), 0),
  );

  @include float-last($output...);
}

@mixin omega(
  $grid: $susy
) {
  @include last($grid);
}


// Get Edge
// --------
// Calculate edge value based on location, if possible
@function get-edge(
  $span
) {
  $span       : parse-span($span);
  $edge       : susy-get(edge, $span);

  @if not $edge {
    $count: column-count(susy-get(columns, $span));
    $location: susy-get(location, $span);
    $n: susy-get(span, $span);

    @if $n == $count {
      $edge: full;
    } @else if $location {
      @if $location == 1 {
        $edge: if($n == $count, full, first);
      } @else if $location + $n - 1 == $count {
        $edge: last;
      }
    }
  }

  @if $edge == alpha or $edge == omega {
    $edge: if($edge == alpha, first, last);
  }

  @return $edge;
}


// Get Location
// ------------
// Calculate location value based on edge, if possible
@function get-location(
  $span
) {
  $span       : parse-span($span);
  $location   : susy-get(location, $span);
  $edge       : get-edge($span);
  $n          : susy-get(span, $span);

  @if $edge and not $location and type-of($n) == number and unitless($n) {
    @if $edge == first {
      $location: 1;
    } @else if $edge == last {
      $location: column-count(susy-get(columns, $span)) - $n + 1;
    }
  }

  @return $location
}