21      * @param string $reference
23     public function __construct($reference)  argument
27         if ($reference !== '') $reference = $this->checkDeprecation($reference);
28         if ($reference !== '') $reference = $this->checkHash($reference);
29         if ($reference !== '') $reference = $this->checkFilename($reference);
30         if ($reference !== '') $reference = $this->checkNamespace($reference);
31         if ($reference !== '') $reference = $this->checkClassPrefix($reference);
32         if ($reference !== '') $reference = $this->checkVariable($reference);
33         if ($reference !== '') $reference = $this->checkFunction($reference);
34         if ($reference !== '') $reference = $this->checkPSRClass($reference);
35         if ($reference !== '') $this->def = $reference;
65      * @param string $reference
68     protected function checkDeprecation($reference)  argument
70         if (isset($this->deprecations[$reference])) {
71             return $this->deprecations[$reference];
73         return $reference;
79      * @param string $reference
82     protected function checkHash($reference)  argument
84         if (strpos($reference, '#') === false) return $reference;
85         list($this->path, $this->def) = explode('#', $reference, 2);
92      * @param string $reference
95     protected function checkFilename($reference)  argument
97         if (preg_match('/\.(php|js|css|html)$/', $reference)) {
99             $this->path = $reference;
102         return $reference;
108      * @param string $reference
111     protected function checkNamespace($reference)  argument
113         if (strpos($reference, '\\') === false) return $reference;
115         $parts = explode('\\', $reference);
117         $reference = array_pop($parts); // last part may be more than a class
124         return $reference;
130     protected function checkClassPrefix($reference)  argument
133             strpos($reference, '::') === false &&
134             strpos($reference, '->') === false
136             return $reference;
138         list($class, $reference) = preg_split('/(::|->)/', $reference, 2);
141         $this->def = $reference;
148      * @param string $reference
151     protected function checkVariable($reference)  argument
153         if ($reference[0] == '$') {
154             $this->def = $reference;
157         return $reference;
163      * @param string $reference
166     protected function checkFunction($reference)  argument
168         if (substr($reference, -2) == '()') {
169             $this->def = $reference;
172         if (preg_match('/\(.+?\)$/', $reference)) {
173             [$reference, /* $arguments */] = explode('(', $reference, 2);
174             $this->def = $reference;
177         return $reference;
187     protected function checkPSRClass($reference)  argument
189         if (preg_match('/^[A-Z][a-z]/', $reference)) {
190             $this->def = $reference;
191             $this->path .= ' ' . $reference;
194         return $reference;