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<?php
namespace Vanderlee\Comprehend\Core\Context;
use Vanderlee\Comprehend\Core\ArgumentsTrait;
use Vanderlee\Comprehend\Match\Success;
use Vanderlee\Comprehend\Parser\Parser;
trait SpacingContextTrait
{
use ArgumentsTrait;
/**
* List of spacers.
* - Parser for a normal spacer.
* - `null` to disable spacing.
* - `true` to use the top-most spacer.
*
* @var Parser[]|null[]|bool[]
*/
private $spacers = [];
public function pushSpacer($skipper = null)
$this->spacers[] = ($skipper === null || $skipper === true)
? $skipper
: $this->getArgument($skipper);
}
public function popSpacer()
array_pop($this->spacers);
public function skipSpacing($in, $offset)
$spacer = end($this->spacers);
// If `true`; use top-most Parser instance in stack.
if ($spacer === true) {
do {
$spacer = prev($this->spacers);
} while ($spacer !== false && !($spacer instanceof Parser));
if ($spacer instanceof Parser) {
$match = $spacer->match($in, $offset);
return ($match instanceof Success)
? $match->length
: false;
return 0;
vanderlee /
Comprehend
