// Isolation Syntax
// ================

// Isolate
// -------
// Set isolation as an override.
// - $input   : <span>
@mixin isolate(
  $input
) {
  $input              : parse-span($input);

  $span               : get-span-setting(span, $input);
  $location           : get-span-setting(location, $input);
  $this-columns       : get-span-setting(columns, $input);
  $this-gutters       : get-span-setting(gutters, $input);
  $this-column-width  : get-span-setting(column-width, $input);
  $this-layout-math   : get-span-setting(layout-math, $input);
  $this-flow          : get-span-setting(flow, $input);

  $push: get-isolation($span, $location, $columns, $gutters, $column-width, $layout-math);

  @include isolate-output($push, $this-flow);
}

// Get Isolation
// -------------
// Return the isolation offset width
// - $span            : <length> | <number>
// - $location        : <number>
// - [$columns]       : <number> | <list>
// - [$gutters]       : <ratio>
// - [$column-width]  : <length>
// - [$layout-math]   : fluid | static
@function get-isolation(
  $span,
  $location,
  $columns            : $columns,
  $gutters            : $gutters,
  $column-width       : $column-width,
  $layout-math        : $layout-math
) {
  $context  : column-sum($columns, $gutters);
  $width    : null;

  @if type-of($location) == number and not unitless($location) {
    $width: $location;
  } @else {
    $push: get-location-position($span, $location, $columns) - 1;
    @if $push > 0 {
      $width: get-span-width($push, 1, $columns, $gutters, $column-width, $layout-math, $outer: outer);
    } @else {
      $width: null;
    }
  }

  @return $width;
}