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Edit File: StringHandler.php

<?php
namespace MailPoetVendor\Symfony\Component\CssSelector\Parser\Handler;
if (!defined('ABSPATH')) exit;
use MailPoetVendor\Symfony\Component\CssSelector\Exception\InternalErrorException;
use MailPoetVendor\Symfony\Component\CssSelector\Exception\SyntaxErrorException;
use MailPoetVendor\Symfony\Component\CssSelector\Parser\Reader;
use MailPoetVendor\Symfony\Component\CssSelector\Parser\Token;
use MailPoetVendor\Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerEscaping;
use MailPoetVendor\Symfony\Component\CssSelector\Parser\Tokenizer\TokenizerPatterns;
use MailPoetVendor\Symfony\Component\CssSelector\Parser\TokenStream;
class StringHandler implements HandlerInterface
{
 private $patterns;
 private $escaping;
 public function __construct(TokenizerPatterns $patterns, TokenizerEscaping $escaping)
 {
 $this->patterns = $patterns;
 $this->escaping = $escaping;
 }
 public function handle(Reader $reader, TokenStream $stream) : bool
 {
 $quote = $reader->getSubstring(1);
 if (!\in_array($quote, ["'", '"'])) {
 return \false;
 }
 $reader->moveForward(1);
 $match = $reader->findPattern($this->patterns->getQuotedStringPattern($quote));
 if (!$match) {
 throw new InternalErrorException(\sprintf('Should have found at least an empty match at %d.', $reader->getPosition()));
 }
 // check unclosed strings
 if (\strlen($match[0]) === $reader->getRemainingLength()) {
 throw SyntaxErrorException::unclosedString($reader->getPosition() - 1);
 }
 // check quotes pairs validity
 if ($quote !== $reader->getSubstring(1, \strlen($match[0]))) {
 throw SyntaxErrorException::unclosedString($reader->getPosition() - 1);
 }
 $string = $this->escaping->escapeUnicodeAndNewLine($match[0]);
 $stream->push(new Token(Token::TYPE_STRING, $string, $reader->getPosition()));
 $reader->moveForward(\strlen($match[0]) + 1);
 return \true;
 }
}

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