blob: bbb6afe2172fc5295ab2e831698b0b278abfcc3f (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
|
<?php
/*
* This file is part of the Symfony package.
*
* (c) Fabien Potencier <fabien@symfony.com>
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Symfony\Component\CssSelector;
use Symfony\Component\CssSelector\Parser\Shortcut\ClassParser;
use Symfony\Component\CssSelector\Parser\Shortcut\ElementParser;
use Symfony\Component\CssSelector\Parser\Shortcut\EmptyStringParser;
use Symfony\Component\CssSelector\Parser\Shortcut\HashParser;
use Symfony\Component\CssSelector\XPath\Extension\HtmlExtension;
use Symfony\Component\CssSelector\XPath\Translator;
/**
* CssSelectorConverter is the main entry point of the component and can convert CSS
* selectors to XPath expressions.
*
* @author Christophe Coevoet <stof@notk.org>
*/
class CssSelectorConverter
{
private $translator;
private $cache;
private static $xmlCache = [];
private static $htmlCache = [];
/**
* @param bool $html Whether HTML support should be enabled. Disable it for XML documents
*/
public function __construct(bool $html = true)
{
$this->translator = new Translator();
if ($html) {
$this->translator->registerExtension(new HtmlExtension($this->translator));
$this->cache = &self::$htmlCache;
} else {
$this->cache = &self::$xmlCache;
}
$this->translator
->registerParserShortcut(new EmptyStringParser())
->registerParserShortcut(new ElementParser())
->registerParserShortcut(new ClassParser())
->registerParserShortcut(new HashParser())
;
}
/**
* Translates a CSS expression to its XPath equivalent.
*
* Optionally, a prefix can be added to the resulting XPath
* expression with the $prefix parameter.
*
* @return string
*/
public function toXPath(string $cssExpr, string $prefix = 'descendant-or-self::')
{
return $this->cache[$prefix][$cssExpr] ?? $this->cache[$prefix][$cssExpr] = $this->translator->cssToXPath($cssExpr, $prefix);
}
}
|
