scratch – Blame information for rev 87
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Rev | Author | Line No. | Line |
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87 | office | 1 | <?php |
2 | |||
3 | /* |
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4 | * This file is part of the Symfony package. |
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5 | * |
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6 | * (c) Fabien Potencier <fabien@symfony.com> |
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7 | * |
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8 | * For the full copyright and license information, please view the LICENSE |
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9 | * file that was distributed with this source code. |
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10 | */ |
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11 | |||
12 | namespace Symfony\Component\CssSelector\Parser; |
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13 | |||
14 | use Symfony\Component\CssSelector\Exception\InternalErrorException; |
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15 | use Symfony\Component\CssSelector\Exception\SyntaxErrorException; |
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16 | |||
17 | /** |
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18 | * CSS selector token stream. |
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19 | * |
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20 | * This component is a port of the Python cssselect library, |
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21 | * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect. |
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22 | * |
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23 | * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com> |
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24 | * |
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25 | * @internal |
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26 | */ |
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27 | class TokenStream |
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28 | { |
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29 | /** |
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30 | * @var Token[] |
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31 | */ |
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32 | private $tokens = array(); |
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33 | |||
34 | /** |
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35 | * @var bool |
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36 | */ |
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37 | private $frozen = false; |
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38 | |||
39 | /** |
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40 | * @var Token[] |
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41 | */ |
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42 | private $used = array(); |
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43 | |||
44 | /** |
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45 | * @var int |
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46 | */ |
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47 | private $cursor = 0; |
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48 | |||
49 | /** |
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50 | * @var Token|null |
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51 | */ |
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52 | private $peeked = null; |
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53 | |||
54 | /** |
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55 | * @var bool |
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56 | */ |
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57 | private $peeking = false; |
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58 | |||
59 | /** |
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60 | * Pushes a token. |
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61 | * |
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62 | * @param Token $token |
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63 | * |
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64 | * @return $this |
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65 | */ |
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66 | public function push(Token $token) |
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67 | { |
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68 | $this->tokens[] = $token; |
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69 | |||
70 | return $this; |
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71 | } |
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72 | |||
73 | /** |
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74 | * Freezes stream. |
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75 | * |
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76 | * @return $this |
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77 | */ |
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78 | public function freeze() |
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79 | { |
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80 | $this->frozen = true; |
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81 | |||
82 | return $this; |
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83 | } |
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84 | |||
85 | /** |
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86 | * Returns next token. |
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87 | * |
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88 | * @return Token |
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89 | * |
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90 | * @throws InternalErrorException If there is no more token |
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91 | */ |
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92 | public function getNext() |
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93 | { |
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94 | if ($this->peeking) { |
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95 | $this->peeking = false; |
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96 | $this->used[] = $this->peeked; |
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97 | |||
98 | return $this->peeked; |
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99 | } |
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100 | |||
101 | if (!isset($this->tokens[$this->cursor])) { |
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102 | throw new InternalErrorException('Unexpected token stream end.'); |
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103 | } |
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104 | |||
105 | return $this->tokens[$this->cursor++]; |
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106 | } |
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107 | |||
108 | /** |
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109 | * Returns peeked token. |
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110 | * |
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111 | * @return Token |
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112 | */ |
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113 | public function getPeek() |
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114 | { |
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115 | if (!$this->peeking) { |
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116 | $this->peeked = $this->getNext(); |
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117 | $this->peeking = true; |
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118 | } |
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119 | |||
120 | return $this->peeked; |
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121 | } |
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122 | |||
123 | /** |
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124 | * Returns used tokens. |
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125 | * |
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126 | * @return Token[] |
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127 | */ |
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128 | public function getUsed() |
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129 | { |
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130 | return $this->used; |
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131 | } |
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132 | |||
133 | /** |
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134 | * Returns nex identifier token. |
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135 | * |
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136 | * @return string The identifier token value |
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137 | * |
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138 | * @throws SyntaxErrorException If next token is not an identifier |
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139 | */ |
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140 | public function getNextIdentifier() |
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141 | { |
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142 | $next = $this->getNext(); |
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143 | |||
144 | if (!$next->isIdentifier()) { |
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145 | throw SyntaxErrorException::unexpectedToken('identifier', $next); |
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146 | } |
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147 | |||
148 | return $next->getValue(); |
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149 | } |
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150 | |||
151 | /** |
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152 | * Returns nex identifier or star delimiter token. |
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153 | * |
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154 | * @return null|string The identifier token value or null if star found |
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155 | * |
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156 | * @throws SyntaxErrorException If next token is not an identifier or a star delimiter |
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157 | */ |
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158 | public function getNextIdentifierOrStar() |
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159 | { |
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160 | $next = $this->getNext(); |
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161 | |||
162 | if ($next->isIdentifier()) { |
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163 | return $next->getValue(); |
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164 | } |
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165 | |||
166 | if ($next->isDelimiter(array('*'))) { |
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167 | return; |
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168 | } |
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169 | |||
170 | throw SyntaxErrorException::unexpectedToken('identifier or "*"', $next); |
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171 | } |
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172 | |||
173 | /** |
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174 | * Skips next whitespace if any. |
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175 | */ |
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176 | public function skipWhitespace() |
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177 | { |
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178 | $peek = $this->getPeek(); |
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179 | |||
180 | if ($peek->isWhitespace()) { |
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181 | $this->getNext(); |
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182 | } |
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183 | } |
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184 | } |