1<?php
2
3/*
4 * This file is part of the Symfony package.
5 *
6 * (c) Fabien Potencier <fabien@symfony.com>
7 *
8 * For the full copyright and license information, please view the LICENSE
9 * file that was distributed with this source code.
10 */
11
12namespace Symfony\Component\CssSelector\Parser\Tokenizer;
13
14use Symfony\Component\CssSelector\Parser\Handler;
15use Symfony\Component\CssSelector\Parser\Reader;
16use Symfony\Component\CssSelector\Parser\Token;
17use Symfony\Component\CssSelector\Parser\TokenStream;
18
19/**
20 * CSS selector tokenizer.
21 *
22 * This component is a port of the Python cssselect library,
23 * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
24 *
25 * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
26 *
27 * @internal
28 */
29class Tokenizer
30{
31    /**
32     * @var Handler\HandlerInterface[]
33     */
34    private $handlers;
35
36    public function __construct()
37    {
38        $patterns = new TokenizerPatterns();
39        $escaping = new TokenizerEscaping($patterns);
40
41        $this->handlers = [
42            new Handler\WhitespaceHandler(),
43            new Handler\IdentifierHandler($patterns, $escaping),
44            new Handler\HashHandler($patterns, $escaping),
45            new Handler\StringHandler($patterns, $escaping),
46            new Handler\NumberHandler($patterns),
47            new Handler\CommentHandler(),
48        ];
49    }
50
51    /**
52     * Tokenize selector source code.
53     */
54    public function tokenize(Reader $reader): TokenStream
55    {
56        $stream = new TokenStream();
57
58        while (!$reader->isEOF()) {
59            foreach ($this->handlers as $handler) {
60                if ($handler->handle($reader, $stream)) {
61                    continue 2;
62                }
63            }
64
65            $stream->push(new Token(Token::TYPE_DELIMITER, $reader->getSubstring(1), $reader->getPosition()));
66            $reader->moveForward(1);
67        }
68
69        return $stream
70            ->push(new Token(Token::TYPE_FILE_END, null, $reader->getPosition()))
71            ->freeze();
72    }
73}
74