mindplay-dk /
petitparserphp
| 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_CBCcould 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.