PhpCsFixer\Tokenizer\TokensAnalyzer::isLambda PHP Метод

    public function isLambda($index)
    {
        $tokens = $this->tokens;
        $token = $tokens[$index];
        if (!$token->isGivenKind(T_FUNCTION)) {
            throw new \LogicException(sprintf('No T_FUNCTION at given index %d, got %s.', $index, $token->getName()));
        }
        $startParenthesisIndex = $tokens->getNextMeaningfulToken($index);
        $startParenthesisToken = $tokens[$startParenthesisIndex];
        // skip & for `function & () {}` syntax
        if ($startParenthesisToken->isGivenKind(CT::T_RETURN_REF)) {
            $startParenthesisIndex = $tokens->getNextMeaningfulToken($startParenthesisIndex);
            $startParenthesisToken = $tokens[$startParenthesisIndex];
        }
        return $startParenthesisToken->equals('(');
    }

 /**
  * Replace occurrences of the name of the classy element by "self" (if possible).
  *
  * @param Tokens $tokens
  * @param string $name
  * @param int    $startIndex
  * @param int    $endIndex
  */
 private function replaceNameOccurrences(Tokens $tokens, $name, $startIndex, $endIndex)
 {
     $tokensAnalyzer = new TokensAnalyzer($tokens);
     for ($i = $startIndex; $i < $endIndex; ++$i) {
         $token = $tokens[$i];
         // skip lambda functions (PHP < 5.4 compatibility)
         if ($token->isGivenKind(T_FUNCTION) && $tokensAnalyzer->isLambda($i)) {
             $i = $tokens->getNextTokenOfKind($i, array('{'));
             $i = $tokens->findBlockEnd(Tokens::BLOCK_TYPE_CURLY_BRACE, $i);
             continue;
         }
         if (!$token->equals(array(T_STRING, $name), false)) {
             continue;
         }
         $prevToken = $tokens[$tokens->getPrevMeaningfulToken($i)];
         $nextToken = $tokens[$tokens->getNextMeaningfulToken($i)];
         // skip tokens that are part of a fully qualified name
         if ($prevToken->isGivenKind(T_NS_SEPARATOR) || $nextToken->isGivenKind(T_NS_SEPARATOR)) {
             continue;
         }
         if ($prevToken->isGivenKind(array(T_INSTANCEOF, T_NEW)) || $nextToken->isGivenKind(T_PAAMAYIM_NEKUDOTAYIM)) {
             $token->setContent('self');
         }
     }
 }