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| 1 | <?php |
| 2 | |
| 3 | declare( strict_types = 1 ); |
| 4 | |
| 5 | namespace MediaWiki\Extension\Math\WikiTexVC; |
| 6 | |
| 7 | use InvalidArgumentException; |
| 8 | |
| 9 | class TexUtil { |
| 10 | private static $instance = null; |
| 11 | private $allFunctions; |
| 12 | private $baseElements; |
| 13 | |
| 14 | /** |
| 15 | * Loads the file texutil.json |
| 16 | * allFunctions holds the root-level function keys |
| 17 | * other objects are second level elements and hold all functions which are assigned to this second level elements |
| 18 | */ |
| 19 | private function __construct() { |
| 20 | $jsonContent = $this->getJSON(); |
| 21 | // dynamically create functions from the content |
| 22 | $this->allFunctions = []; |
| 23 | $this->baseElements = []; |
| 24 | $this->allFunctions["\\begin"] = true; |
| 25 | $this->allFunctions["\\end"] = true; |
| 26 | |
| 27 | foreach ( $jsonContent as $key => $value ) { |
| 28 | // Adding all basic elements as functions |
| 29 | foreach ( $value as $elementKey => $element ) { |
| 30 | if ( !array_key_exists( $elementKey, $this->baseElements ) ) { |
| 31 | $this->baseElements[$elementKey] = []; |
| 32 | $this->baseElements[$elementKey][$key] = $element; |
| 33 | |
| 34 | } else { |
| 35 | if ( !array_key_exists( $key, $this->baseElements[$elementKey] ) ) { |
| 36 | $this->baseElements[$elementKey][$key] = $element; |
| 37 | } |
| 38 | } |
| 39 | } |
| 40 | // Adding function to all functions |
| 41 | $this->allFunctions[$key] = true; |
| 42 | } |
| 43 | } |
| 44 | |
| 45 | public static function removeInstance() { |
| 46 | self::$instance = null; |
| 47 | } |
| 48 | |
| 49 | public static function getInstance() { |
| 50 | if ( self::$instance == null ) { |
| 51 | self::$instance = new TexUtil(); |
| 52 | } |
| 53 | |
| 54 | return self::$instance; |
| 55 | } |
| 56 | |
| 57 | /** |
| 58 | * Returning the base elements array. |
| 59 | * This is only used for testing in TexUtilTest.php. |
| 60 | * @return array |
| 61 | */ |
| 62 | public function getBaseElements() { |
| 63 | return $this->baseElements; |
| 64 | } |
| 65 | |
| 66 | /** |
| 67 | * Getting an element by key in allFunctions. |
| 68 | * If the key is defined, return true if not false. |
| 69 | * @param string $key string to check in allFunctions |
| 70 | * @return bool |
| 71 | */ |
| 72 | public function getAllFunctionsAt( string $key ) { |
| 73 | if ( array_key_exists( $key, $this->allFunctions ) ) { |
| 74 | return true; |
| 75 | } else { |
| 76 | return false; |
| 77 | } |
| 78 | } |
| 79 | |
| 80 | /** |
| 81 | * Allows to directly call functions defined in from the json-file. |
| 82 | * @param mixed $func |
| 83 | * @param mixed $params |
| 84 | * @return false|mixed |
| 85 | */ |
| 86 | public function __call( $func, $params ) { |
| 87 | if ( array_key_exists( $func, $this->baseElements ) ) { |
| 88 | $currentFunction = $this->baseElements[$func]; |
| 89 | if ( array_key_exists( $params[0], $currentFunction ) ) { |
| 90 | return $currentFunction[$params[0]]; |
| 91 | } else { |
| 92 | return false; |
| 93 | } |
| 94 | } else { |
| 95 | throw new InvalidArgumentException( "Function not defined in json " . $func ); |
| 96 | |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /** |
| 101 | * Reads the json file to an object |
| 102 | * @return array |
| 103 | */ |
| 104 | private function getJSON() { |
| 105 | $file = self::getJsonFile(); |
| 106 | $json = json_decode( $file, true ); |
| 107 | return $json; |
| 108 | } |
| 109 | |
| 110 | /** |
| 111 | * @return false|string |
| 112 | */ |
| 113 | public static function getJsonFile() { |
| 114 | return file_get_contents( __DIR__ . '/texutil.json' ); |
| 115 | } |
| 116 | } |