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<?php |
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3
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namespace PhpBoot\DB; |
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5
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/** |
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6
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* 剪出字符串中的嵌套字符串 |
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7
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* 既从aaa"bb\"b"ccc中, 取出"bb\"b" |
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* @author caoym |
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*/ |
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class NestedStringCut{ |
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2 |
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public function __construct($str){ |
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2 |
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$pos = 0; |
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$state = 'stateNormal'; |
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2 |
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while (true){ |
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$pos = $this->$state($str, $pos, $state); |
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2 |
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if($pos === false){ |
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break; |
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} |
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}; |
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return false; |
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23
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} |
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public function getSnippets(){ |
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return $this->snippets; |
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} |
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2 |
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public function getText(){ |
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return implode('', $this->snippets); |
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31
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} |
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32
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/** |
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* 将剪切后的字符串位置转换成原始字符串位置 |
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34
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* @param int $pos |
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35
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* @param int |
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36
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*/ |
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37
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2 |
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public function mapPos($pos){ |
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38
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39
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2 |
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foreach ($this->snippets as $k => $v){ |
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40
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2 |
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$pos += $k; |
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41
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2 |
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if($pos < $k + strlen($v)){ |
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break; |
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43
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} |
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$pos -= ($k + strlen($v)); |
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46
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2 |
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} |
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47
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return $pos; |
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48
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} |
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49
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/** |
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50
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* 普通状态 |
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51
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*/ |
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52
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2 |
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private function stateNormal($str, $pos, &$next){ |
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$ori = $pos; |
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54
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$posSQ = strpos($str, '\'', $pos); |
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55
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$posDQ = strpos($str, '"', $pos); |
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56
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$pos = $posSQ; |
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$this->subStateQ = '\''; |
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58
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$next = 'stateQ'; |
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59
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2 |
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if($posDQ !== false && (($posDQ < $pos) || ($pos === false)) ){ |
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60
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$pos = $posDQ; |
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61
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$this->subStateQ = '"'; |
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62
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} |
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63
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2 |
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if($pos !== false){ |
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64
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$this->snippets[$ori] = substr($str, $ori, $pos-$ori); |
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65
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$pos ++; |
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66
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}else{ |
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67
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2 |
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$this->snippets[$ori] = substr($str, $ori); |
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68
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} |
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69
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2 |
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return $pos; |
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70
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} |
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71
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72
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/** |
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73
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* 进入引号状态 |
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74
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*/ |
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75
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private function stateQ($str, $pos, &$next){ |
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$posESC = strpos($str, '\\', $pos); |
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$posQ = strpos($str, $this->subStateQ, $pos); |
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$pos = $posESC; |
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79
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$next = 'stateESC'; |
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80
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81
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if($posQ !== false && (($posQ<$posESC) || ($posESC === false))){ |
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82
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$pos = $posQ; |
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83
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$next = 'stateNormal'; |
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84
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} |
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85
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if($pos !== false){ |
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86
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$pos ++; |
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87
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} |
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88
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return $pos; |
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89
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} |
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90
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/** |
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91
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* 进入转义状态 |
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92
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*/ |
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93
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private function stateESC($str, $pos, &$next){ |
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$pos++; |
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95
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if($pos >= strlen($str)){ |
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96
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return false; |
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97
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} |
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98
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$next = 'stateQ'; |
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99
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return $pos; |
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100
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} |
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101
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/** |
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102
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* 去掉嵌套字符串后的内容 |
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103
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* @var array |
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104
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*/ |
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105
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private $snippets=array(); |
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106
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107
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private $subStateQ; |
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108
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} |
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109
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caoym /
phpboot
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