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;
13
14/**
15 * CSS selector reader.
16 *
17 * This component is a port of the Python cssselect library,
18 * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
19 *
20 * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
21 *
22 * @internal
23 */
24class Reader
25{
26    private $source;
27    private $length;
28    private $position = 0;
29
30    public function __construct(string $source)
31    {
32        $this->source = $source;
33        $this->length = \strlen($source);
34    }
35
36    public function isEOF(): bool
37    {
38        return $this->position >= $this->length;
39    }
40
41    public function getPosition(): int
42    {
43        return $this->position;
44    }
45
46    public function getRemainingLength(): int
47    {
48        return $this->length - $this->position;
49    }
50
51    public function getSubstring(int $length, int $offset = 0): string
52    {
53        return substr($this->source, $this->position + $offset, $length);
54    }
55
56    public function getOffset(string $string)
57    {
58        $position = strpos($this->source, $string, $this->position);
59
60        return false === $position ? false : $position - $this->position;
61    }
62
63    /**
64     * @return array|false
65     */
66    public function findPattern(string $pattern)
67    {
68        $source = substr($this->source, $this->position);
69
70        if (preg_match($pattern, $source, $matches)) {
71            return $matches;
72        }
73
74        return false;
75    }
76
77    public function moveForward(int $length)
78    {
79        $this->position += $length;
80    }
81
82    public function moveToEnd()
83    {
84        $this->position = $this->length;
85    }
86}
87