searchpro / BerqWP / vendor-prefixed / vendor / symfony / css-selector / Parser / TokenStream.php

TokenStream.php in BerqWP – All-In-One Optimization for Core Web Vitals, Cache, CDN, Images, CSS & JavaScript 4.1.20, at BerqWP/vendor-prefixed/vendor/symfony/css-selector/Parser/TokenStream.php

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1	<?php
2
3	/*
4	* This file is part of the Symfony package.
5	*
6	* (c) Fabien Potencier <[email protected]>
7	*
8	* For the full copyright and license information, please view the LICENSE
9	* file that was distributed with this source code.
10	*/
11	namespace BerqWP_Deps\Symfony\Component\CssSelector\Parser;
12
13	use BerqWP_Deps\Symfony\Component\CssSelector\Exception\InternalErrorException;
14	use BerqWP_Deps\Symfony\Component\CssSelector\Exception\SyntaxErrorException;
15	/**
16	* CSS selector token stream.
17	*
18	* This component is a port of the Python cssselect library,
19	* which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
20	*
21	* @author Jean-François Simon <[email protected]>
22	*
23	* @internal
24	*/
25	class TokenStream
26	{
27	/**
28	* @var Token[]
29	*/
30	private $tokens = [];
31	/**
32	* @var Token[]
33	*/
34	private $used = [];
35	/**
36	* @var int
37	*/
38	private $cursor = 0;
39	/**
40	* @var Token\|null
41	*/
42	private $peeked;
43	/**
44	* @var bool
45	*/
46	private $peeking = \false;
47	/**
48	* Pushes a token.
49	*
50	* @return $this
51	*/
52	public function push(Token $token): self
53	{
54	$this->tokens[] = $token;
55	return $this;
56	}
57	/**
58	* Freezes stream.
59	*
60	* @return $this
61	*/
62	public function freeze(): self
63	{
64	return $this;
65	}
66	/**
67	* Returns next token.
68	*
69	* @throws InternalErrorException If there is no more token
70	*/
71	public function getNext(): Token
72	{
73	if ($this->peeking) {
74	$this->peeking = \false;
75	$this->used[] = $this->peeked;
76	return $this->peeked;
77	}
78	if (!isset($this->tokens[$this->cursor])) {
79	throw new InternalErrorException('Unexpected token stream end.');
80	}
81	return $this->tokens[$this->cursor++];
82	}
83	/**
84	* Returns peeked token.
85	*/
86	public function getPeek(): Token
87	{
88	if (!$this->peeking) {
89	$this->peeked = $this->getNext();
90	$this->peeking = \true;
91	}
92	return $this->peeked;
93	}
94	/**
95	* Returns used tokens.
96	*
97	* @return Token[]
98	*/
99	public function getUsed(): array
100	{
101	return $this->used;
102	}
103	/**
104	* Returns next identifier token.
105	*
106	* @throws SyntaxErrorException If next token is not an identifier
107	*/
108	public function getNextIdentifier(): string
109	{
110	$next = $this->getNext();
111	if (!$next->isIdentifier()) {
112	throw SyntaxErrorException::unexpectedToken('identifier', $next);
113	}
114	return $next->getValue();
115	}
116	/**
117	* Returns next identifier or null if star delimiter token is found.
118	*
119	* @throws SyntaxErrorException If next token is not an identifier or a star delimiter
120	*/
121	public function getNextIdentifierOrStar(): ?string
122	{
123	$next = $this->getNext();
124	if ($next->isIdentifier()) {
125	return $next->getValue();
126	}
127	if ($next->isDelimiter(['*'])) {
128	return null;
129	}
130	throw SyntaxErrorException::unexpectedToken('identifier or "*"', $next);
131	}
132	/**
133	* Skips next whitespace if any.
134	*/
135	public function skipWhitespace()
136	{
137	$peek = $this->getPeek();
138	if ($peek->isWhitespace()) {
139	$this->getNext();
140	}
141	}
142	}
143