1 | <?php |
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2 | |||
3 | namespace petitparser; |
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4 | |||
5 | /** |
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6 | * Example JSON parser. |
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7 | */ |
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8 | class JsonParser extends CompositeParser |
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9 | { |
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10 | 1 | protected function initialize() |
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11 | { |
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12 | 1 | $this->defineGrammar(); |
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13 | 1 | $this->defineActions(); |
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14 | 1 | } |
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15 | |||
16 | static $escapeTable = array( |
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17 | "\\" => "\\", |
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18 | "/" => "/", |
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19 | '"' => '"', |
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20 | "b" => "\b", |
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21 | "f" => "\f", |
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22 | "n" => "\n", |
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23 | "r" => "\r", |
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24 | "t" => "\t", |
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25 | ); |
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26 | |||
27 | 1 | private function defineGrammar() |
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28 | { |
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29 | 1 | $this->def('start', $this->ref('value')->end_()); |
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30 | |||
31 | 1 | $this->def('array', |
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32 | 1 | char('[') |
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33 | 1 | ->trim() |
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34 | 1 | ->seq($this->ref('elements')->optional()) |
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35 | 1 | ->seq(char(']')->trim())); |
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36 | |||
37 | 1 | $this->def('elements', |
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38 | 1 | $this->ref('value')->separatedBy(char(',')->trim(), false)); |
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39 | |||
40 | 1 | $this->def('members', |
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41 | 1 | $this->ref('pair')->separatedBy(char(',')->trim(), false)); |
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42 | |||
43 | 1 | $this->def('object', |
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44 | 1 | char('{') |
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45 | 1 | ->trim() |
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46 | 1 | ->seq($this->ref('members')->optional()) |
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47 | 1 | ->seq(char('}')->trim())); |
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48 | |||
49 | 1 | $this->def('pair', |
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50 | 1 | $this->ref('stringToken') |
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51 | 1 | ->seq(char(':')->trim()) |
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52 | 1 | ->seq($this->ref('value'))); |
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53 | |||
54 | 1 | $this->def('value', |
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55 | 1 | $this->ref('stringToken') |
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56 | 1 | ->or_($this->ref('numberToken')) |
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57 | 1 | ->or_($this->ref('object')) |
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58 | 1 | ->or_($this->ref('array')) |
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59 | 1 | ->or_($this->ref('trueToken')) |
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60 | 1 | ->or_($this->ref('falseToken')) |
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61 | 1 | ->or_($this->ref('nullToken'))); |
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62 | |||
63 | 1 | $this->def('trueToken', string('true')->flatten()->trim()); |
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64 | 1 | $this->def('falseToken', string('false')->flatten()->trim()); |
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65 | 1 | $this->def('nullToken', string('null')->flatten()->trim()); |
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66 | 1 | $this->def('stringToken', $this->ref('stringPrimitive')->flatten()->trim()); |
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67 | 1 | $this->def('numberToken', $this->ref('numberPrimitive')->flatten()->trim()); |
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68 | |||
69 | 1 | $this->def('characterPrimitive', |
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70 | 1 | $this->ref('characterEscape') |
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71 | 1 | ->or_($this->ref('characterOctal')) |
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72 | 1 | ->or_($this->ref('characterNormal'))); |
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73 | |||
74 | 1 | $this->def('characterEscape', |
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75 | 1 | char("\\")->seq(anyIn(array_keys(JsonParser::$escapeTable)))); |
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76 | |||
77 | 1 | $this->def('characterNormal', |
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78 | 1 | anyIn("\"\\")->neg()); |
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79 | |||
80 | 1 | $this->def('characterOctal', |
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81 | 1 | string("\\u")->seq(pattern("0-9A-Fa-f")->times(4)->flatten())); |
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82 | |||
83 | 1 | $this->def('numberPrimitive', |
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84 | 1 | char('-')->optional() |
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85 | 1 | ->seq(char('0')->or_(digit()->plus())) |
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86 | 1 | ->seq(char('.')->seq(digit()->plus())->optional()) |
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87 | 1 | ->seq(anyIn('eE')->seq(anyIn('-+')->optional())->seq(digit()->plus())->optional())); |
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88 | |||
89 | 1 | $this->def('stringPrimitive', |
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90 | 1 | char('"') |
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91 | 1 | ->seq($this->ref('characterPrimitive')->star()) |
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92 | 1 | ->seq(char('"'))); |
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93 | 1 | } |
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94 | |||
95 | 1 | private function defineActions() |
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96 | { |
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97 | 1 | $this->action( |
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98 | 1 | 'array', |
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99 | function ($each) { |
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100 | 1 | return $each[1] !== null ? $each[1] : array(); |
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101 | } |
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102 | 1 | ); |
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103 | |||
104 | 1 | $this->action( |
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105 | 1 | 'object', |
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106 | function ($each) { |
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107 | 1 | $result = array(); |
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108 | 1 | if ($each[1] !== null) { |
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109 | 1 | foreach ($each[1] as $element) { |
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110 | 1 | $result[$element[0]] = $element[2]; |
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111 | 1 | } |
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112 | 1 | } |
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113 | 1 | return $result; |
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114 | } |
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115 | 1 | ); |
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116 | |||
117 | 1 | $this->action( |
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118 | 1 | 'trueToken', |
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119 | function ($each) { |
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120 | 1 | return true; |
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121 | } |
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122 | 1 | ); |
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123 | |||
124 | 1 | $this->action( |
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125 | 1 | 'falseToken', |
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126 | function ($each) { |
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127 | 1 | return false; |
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128 | } |
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129 | 1 | ); |
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130 | |||
131 | 1 | $this->action( |
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132 | 1 | 'nullToken', |
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133 | function ($each) { |
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134 | 1 | return null; |
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135 | } |
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136 | 1 | ); |
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137 | |||
138 | 1 | $self = $this; |
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139 | |||
140 | 1 | $this->redef( |
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141 | 1 | 'stringToken', |
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142 | function (Parser $parser) use ($self) { |
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143 | 1 | return $self->ref('stringPrimitive')->trim(); |
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144 | } |
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145 | 1 | ); |
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146 | |||
147 | 1 | $this->action( |
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148 | 1 | 'numberToken', |
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149 | function ($each) { |
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150 | 1 | $float = floatval($each); |
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151 | 1 | $int = intval($float); |
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152 | |||
153 | 1 | if (($float == $int) && (false === strpos($each, '.'))) { |
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154 | 1 | return $int; |
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155 | } else { |
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156 | 1 | return $float; |
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157 | } |
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158 | } |
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159 | 1 | ); |
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160 | |||
161 | 1 | $this->action( |
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162 | 1 | 'stringPrimitive', |
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163 | function ($each) { |
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164 | 1 | return implode('', $each[1]); |
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165 | } |
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166 | 1 | ); |
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167 | |||
168 | 1 | $this->action( |
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169 | 1 | 'characterEscape', |
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170 | function ($each) { |
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171 | 1 | return JsonParser::$escapeTable[$each[1]]; |
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172 | } |
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173 | 1 | ); |
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174 | |||
175 | 1 | $this->action( |
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176 | 1 | 'characterOctal', |
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177 | function ($each) { |
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178 | throw new \Exception('Support for octal characters not implemented'); |
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179 | } |
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180 | 1 | ); |
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181 | 1 | } |
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182 | } |
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183 |
This check looks for accesses to local static members using the fully qualified name instead of
self::
.While this is perfectly valid, the fully qualified name of
Certificate::TRIPLEDES_CBC
could just as well be replaced byself::TRIPLEDES_CBC
. Referencing local members withself::
assured the access will still work when the class is renamed, makes it perfectly clear that the member is in fact local and will usually be shorter.