PhpParser\Parser\Php7::reduceRule420 PHP Method

    protected function reduceRule420() {
         $attrs = $this->startAttributeStack[$this->stackPos-(3-1)] + $this->endAttributes; $attrs['kind'] = strpos($this->semStack[$this->stackPos-(3-1)], "'") === false ? Scalar\String_::KIND_HEREDOC : Scalar\String_::KIND_NOWDOC; preg_match('/\A[bB]?<<<[ \t]*[\'"]?([a-zA-Z_\x7f-\xff][a-zA-Z0-9_\x7f-\xff]*)[\'"]?(?:\r\n|\n|\r)\z/', $this->semStack[$this->stackPos-(3-1)], $matches); $attrs['docLabel'] = $matches[1];;
            foreach ($this->semStack[$this->stackPos-(3-2)] as $s) { if ($s instanceof Node\Scalar\EncapsedStringPart) { $s->value = Node\Scalar\String_::parseEscapeSequences($s->value, null, true); } } $s->value = preg_replace('~(\r\n|\n|\r)\z~', '', $s->value); if ('' === $s->value) array_pop($this->semStack[$this->stackPos-(3-2)]);; $this->semValue = new Scalar\Encapsed($this->semStack[$this->stackPos-(3-2)], $attrs);
    }