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- Veröffentlicht
- 28.08.2024
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Encoder.php
001 <?php
002
003 /**
004 * @package s9e\TextFormatter
005 * @copyright Copyright (c) 2010-2022 The s9e authors
006 * @license http://www.opensource.org/licenses/mit-license.php The MIT License
007 */
008 namespace s9e\TextFormatter\Configurator\JavaScript;
009
010 use RuntimeException;
011 use s9e\TextFormatter\Configurator\Items\Regexp;
012 use s9e\TextFormatter\Configurator\JavaScript\Code;
013 use s9e\TextFormatter\Configurator\JavaScript\Dictionary;
014 use s9e\TextFormatter\Configurator\JavaScript\Encoder;
015
016 class Encoder
017 {
018 /**
019 * @var callable[]
020 */
021 public $objectEncoders;
022
023 /**
024 * @var callable[]
025 */
026 public $typeEncoders;
027
028 /**
029 * Constructor
030 *
031 * Will set up the default encoders
032 */
033 public function __construct()
034 {
035 $ns = 's9e\\TextFormatter\\Configurator\\';
036 $this->objectEncoders = [
037 $ns . 'Items\\Regexp' => [$this, 'encodeRegexp'],
038 $ns . 'JavaScript\\Code' => [$this, 'encodeCode'],
039 $ns . 'JavaScript\\ConfigValue' => [$this, 'encodeConfigValue'],
040 $ns . 'JavaScript\\Dictionary' => [$this, 'encodeDictionary']
041 ];
042 $this->typeEncoders = [
043 'array' => [$this, 'encodeArray'],
044 'boolean' => [$this, 'encodeBoolean'],
045 'double' => [$this, 'encodeScalar'],
046 'integer' => [$this, 'encodeScalar'],
047 'object' => [$this, 'encodeObject'],
048 'string' => [$this, 'encodeScalar']
049 ];
050 }
051
052 /**
053 * Encode a value into JavaScript
054 *
055 * @param mixed $value
056 * @return string
057 */
058 public function encode($value)
059 {
060 $type = gettype($value);
061 if (!isset($this->typeEncoders[$type]))
062 {
063 throw new RuntimeException('Cannot encode ' . $type . ' value');
064 }
065
066 return $this->typeEncoders[$type]($value);
067 }
068
069 /**
070 * Encode an array to JavaScript
071 *
072 * @param array $array
073 * @return string
074 */
075 protected function encodeArray(array $array)
076 {
077 return ($this->isIndexedArray($array)) ? $this->encodeIndexedArray($array) : $this->encodeAssociativeArray($array);
078 }
079
080 /**
081 * Encode an associative array to JavaScript
082 *
083 * @param array $array
084 * @param bool $preserveNames
085 * @return string
086 */
087 protected function encodeAssociativeArray(array $array, $preserveNames = false)
088 {
089 ksort($array);
090 $src = '{';
091 $sep = '';
092 foreach ($array as $k => $v)
093 {
094 $src .= $sep . $this->encodePropertyName("$k", $preserveNames) . ':' . $this->encode($v);
095 $sep = ',';
096 }
097 $src .= '}';
098
099 return $src;
100 }
101
102 /**
103 * Encode a boolean value into JavaScript
104 *
105 * @param bool $value
106 * @return string
107 */
108 protected function encodeBoolean($value)
109 {
110 return ($value) ? '!0' : '!1';
111 }
112
113 /**
114 * Encode a Code instance into JavaScript
115 *
116 * @param Code $code
117 * @return string
118 */
119 protected function encodeCode(Code $code)
120 {
121 return (string) $code;
122 }
123
124 /**
125 * Encode a ConfigValue instance into JavaScript
126 *
127 * @param ConfigValue $configValue
128 * @return string
129 */
130 protected function encodeConfigValue(ConfigValue $configValue)
131 {
132 return ($configValue->isDeduplicated()) ? $configValue->getVarName() : $this->encode($configValue->getValue());
133 }
134
135 /**
136 * Encode a Dictionary object into a JavaScript object
137 *
138 * @param Dictionary $dict
139 * @return string
140 */
141 protected function encodeDictionary(Dictionary $dict)
142 {
143 return $this->encodeAssociativeArray($dict->getArrayCopy(), true);
144 }
145
146 /**
147 * Encode an indexed array to JavaScript
148 *
149 * @param array $array
150 * @return string
151 */
152 protected function encodeIndexedArray(array $array)
153 {
154 return '[' . implode(',', array_map([$this, 'encode'], $array)) . ']';
155 }
156
157 /**
158 * Encode an object into JavaScript
159 *
160 * @param object $object
161 * @return string
162 */
163 protected function encodeObject($object)
164 {
165 foreach ($this->objectEncoders as $className => $callback)
166 {
167 if ($object instanceof $className)
168 {
169 return $callback($object);
170 }
171 }
172
173 throw new RuntimeException('Cannot encode instance of ' . get_class($object));
174 }
175
176 /**
177 * Encode an object property name into JavaScript
178 *
179 * @param string $name
180 * @param bool $preserveNames
181 * @return string
182 */
183 protected function encodePropertyName($name, $preserveNames)
184 {
185 return ($preserveNames || !$this->isLegalProp($name)) ? json_encode($name) : $name;
186 }
187
188 /**
189 * Encode a Regexp object into JavaScript
190 *
191 * @param Regexp $regexp
192 * @return string
193 */
194 protected function encodeRegexp(Regexp $regexp)
195 {
196 return $regexp->getJS();
197 }
198
199 /**
200 * Encode a scalar value into JavaScript
201 *
202 * @param mixed $value
203 * @return string
204 */
205 protected function encodeScalar($value)
206 {
207 return json_encode($value);
208 }
209
210 /**
211 * Test whether given array is a numerically indexed array
212 *
213 * @param array $array
214 * @return bool
215 */
216 protected function isIndexedArray(array $array)
217 {
218 if (empty($array))
219 {
220 return true;
221 }
222
223 if (isset($array[0]) && array_keys($array) === range(0, count($array) - 1))
224 {
225 return true;
226 }
227
228 return false;
229 }
230
231 /**
232 * Test whether a string can be used as a property name, unquoted
233 *
234 * @link http://es5.github.io/#A.1
235 *
236 * @param string $name Property's name
237 * @return bool
238 */
239 protected function isLegalProp($name)
240 {
241 /**
242 * @link https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Reserved_Words
243 * @link http://www.crockford.com/javascript/survey.html
244 */
245 $reserved = ['abstract', 'boolean', 'break', 'byte', 'case', 'catch', 'char', 'class', 'const', 'continue', 'debugger', 'default', 'delete', 'do', 'double', 'else', 'enum', 'export', 'extends', 'false', 'final', 'finally', 'float', 'for', 'function', 'goto', 'if', 'implements', 'import', 'in', 'instanceof', 'int', 'interface', 'let', 'long', 'native', 'new', 'null', 'package', 'private', 'protected', 'public', 'return', 'short', 'static', 'super', 'switch', 'synchronized', 'this', 'throw', 'throws', 'transient', 'true', 'try', 'typeof', 'var', 'void', 'volatile', 'while', 'with'];
246
247 if (in_array($name, $reserved, true))
248 {
249 return false;
250 }
251
252 return (bool) preg_match('#^(?![0-9])[$_\\pL][$_\\pL\\pNl]+$#Du', $name);
253 }
254 }