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<?php
declare(strict_types=1);
namespace Dotenv\Parser;
final class Lexer
{
/**
* The regex for each type of token.
*
* @var string
*/
private const PATTERNS = [
'[\r\n]{1,1000}', '[^\S\r\n]{1,1000}', '\\\\', '\'', '"', '\\#', '\\$', '([^(\s\\\\\'"\\#\\$)]|\\(|\\)){1,1000}',
];
/**
* This class is a singleton.
*
* @codeCoverageIgnore
*
* @return void
*/
private function __construct()
{
//
}
/**
* Convert content into a token stream.
*
* Multibyte string processing is not needed here, and nether is error
* handling, for performance reasons.
*
* @param string $content
*
* @return \Generator<string>
*/
public static function lex(string $content)
{
static $regex;
if ($regex === null) {
$regex = '(('.\implode(')|(', self::PATTERNS).'))A';
}
$tokens = [];
$offset = 0;
while (isset($content[$offset])) {
if (!\preg_match($regex, $content, $matches, 0, $offset)) {
throw new \Error(\sprintf('Lexer encountered unexpected character [%s].', $content[$offset]));
}
$offset += \strlen($matches[0]);
yield $matches[0];
}
}
}