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StringLiteral.php
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/
StringLiteral.php
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<?php
declare(strict_types=1);
namespace Neos\Fusion\Afx\Parser\Expression;
/*
* This file is part of the Neos.Fusion.Afx package.
*
* (c) Contributors of the Neos Project - www.neos.io
*
* This package is Open Source Software. For the full copyright and license
* information, please view the LICENSE file which was distributed with this
* source code.
*/
use Neos\Fusion\Afx\Parser\AfxParserException;
use Neos\Fusion\Afx\Parser\Lexer;
/**
* Class StringLiteral
* @package Neos\Fusion\Afx\Parser\Expression
*/
class StringLiteral
{
/**
* @param Lexer $lexer
* @return string
* @throws AfxParserException
*/
public static function parse(Lexer $lexer): string
{
$openingQuoteSign = '';
$contents = '';
$willBeEscaped = false;
if ($lexer->isSingleQuote() || $lexer->isDoubleQuote()) {
$openingQuoteSign = $lexer->consume();
} else {
throw new AfxParserException('Unquoted String literal', 1557860514);
}
while (true) {
if ($lexer->isEnd()) {
throw new AfxParserException(sprintf('Unfinished string literal "%s"', $contents), 1557860504);
}
if ($lexer->isBackSlash() && !$willBeEscaped) {
$willBeEscaped = true;
$lexer->consume();
continue;
}
if ($lexer->isSingleQuote() || $lexer->isDoubleQuote()) {
$closingQuoteSign = $lexer->consume();
if (!$willBeEscaped && $openingQuoteSign === $closingQuoteSign) {
return $contents;
}
$contents .= $closingQuoteSign;
$willBeEscaped = false;
continue;
}
$contents .= $lexer->consume();
$willBeEscaped = false;
}
}
}