59 lines
1.2 KiB
PHP
59 lines
1.2 KiB
PHP
|
<?php
|
||
|
|
|
||
|
|
declare(strict_types=1);
|
||
|
|
|
||
|
|
namespace Dotenv\Parser;
|
||
|
|
|
||
|
|
final class Lexer
|
||
|
|
{
|
||
|
|
/**
|
||
|
|
* The regex for each type of token.
|
||
|
|
*/
|
||
|
|
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';
|
||
|
|
}
|
||
|
|
|
||
|
|
$offset = 0;
|
||
|
|
|
||
|
|
while (isset($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];
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|