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1 <?php
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2
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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
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12 namespace Symfony\Component\CssSelector\Parser;
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13
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14 /**
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15 * CSS selector reader.
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16 *
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17 * This component is a port of the Python cssselect library,
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18 * which is copyright Ian Bicking, @see https://github.com/SimonSapin/cssselect.
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19 *
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20 * @author Jean-François Simon <jeanfrancois.simon@sensiolabs.com>
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21 *
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22 * @internal
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23 */
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24 class Reader
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25 {
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26 private $source;
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27 private $length;
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28 private $position = 0;
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29
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30 /**
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31 * @param string $source
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32 */
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33 public function __construct($source)
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34 {
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35 $this->source = $source;
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36 $this->length = \strlen($source);
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37 }
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38
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39 /**
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40 * @return bool
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41 */
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42 public function isEOF()
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43 {
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44 return $this->position >= $this->length;
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45 }
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46
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47 /**
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48 * @return int
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49 */
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50 public function getPosition()
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51 {
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52 return $this->position;
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53 }
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54
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55 /**
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56 * @return int
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57 */
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58 public function getRemainingLength()
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59 {
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60 return $this->length - $this->position;
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61 }
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62
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63 /**
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64 * @param int $length
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65 * @param int $offset
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66 *
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67 * @return string
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68 */
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69 public function getSubstring($length, $offset = 0)
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70 {
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71 return substr($this->source, $this->position + $offset, $length);
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72 }
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73
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74 /**
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75 * @param string $string
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76 *
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77 * @return int
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78 */
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79 public function getOffset($string)
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80 {
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81 $position = strpos($this->source, $string, $this->position);
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82
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83 return false === $position ? false : $position - $this->position;
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84 }
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85
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86 /**
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87 * @param string $pattern
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88 *
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89 * @return array|false
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90 */
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91 public function findPattern($pattern)
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92 {
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93 $source = substr($this->source, $this->position);
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94
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95 if (preg_match($pattern, $source, $matches)) {
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96 return $matches;
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97 }
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98
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99 return false;
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100 }
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101
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102 /**
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103 * @param int $length
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104 */
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105 public function moveForward($length)
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106 {
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107 $this->position += $length;
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108 }
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109
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110 public function moveToEnd()
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111 {
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112 $this->position = $this->length;
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113 }
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114 }
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