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<?php
declare(strict_types=1);
namespace Antlr\Antlr4\Runtime\Error\Exceptions;
use Antlr\Antlr4\Runtime\Atn\ATNConfigSet;
use Antlr\Antlr4\Runtime\CharStream;
use Antlr\Antlr4\Runtime\Lexer;
use Antlr\Antlr4\Runtime\Utils\StringUtils;
class LexerNoViableAltException extends RecognitionException
{
/**
* Matching attempted at what input index?
*
* @var int
*/
private $startIndex;
* Which configurations did we try at $input->index() that couldn't match $input->LA(1)?
* @var ATNConfigSet
private $deadEndConfigs;
public function __construct(Lexer $lexer, CharStream $input, int $startIndex, ATNConfigSet $deadEndConfigs)
parent::__construct($lexer, $input, null);
$this->startIndex = $startIndex;
$this->deadEndConfigs = $deadEndConfigs;
}
public function getDeadEndConfigs() : ATNConfigSet
return $this->deadEndConfigs;
public function __toString() : string
$symbol = '';
$input = $this->getInputStream();
if (!$input instanceof CharStream) {
throw new \RuntimeException('Unexpected stream type.');
if ($input !== null && $this->startIndex >= 0 && $this->startIndex < $input->getLength()) {
$symbol = $input->getText($this->startIndex, $this->startIndex);
$symbol = StringUtils::escapeWhitespace($symbol, false);
return \sprintf('%s(\'%s\')', self::class, $symbol);
SetBased /
antlr-php-runtime
