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| 1 | <?php |
| 2 | |
| 3 | namespace Wikimedia\RemexHtml\Tokenizer; |
| 4 | |
| 5 | /** |
| 6 | * An Attributes implementation which defers interpretation of regex match |
| 7 | * results until the caller requires them. |
| 8 | * |
| 9 | * This should not be directly instantiated outside of Tokenizer. |
| 10 | */ |
| 11 | class LazyAttributes implements Attributes { |
| 12 | /** @var callable */ |
| 13 | private $interpreter; |
| 14 | |
| 15 | /** @var mixed */ |
| 16 | private $data; |
| 17 | |
| 18 | /** @var string[] */ |
| 19 | private $attributes; |
| 20 | |
| 21 | /** @var Attribute[] */ |
| 22 | private $attrObjects; |
| 23 | |
| 24 | public function __construct( $data, callable $interpreter ) { |
| 25 | $this->interpreter = $interpreter; |
| 26 | $this->data = $data; |
| 27 | } |
| 28 | |
| 29 | /** |
| 30 | * Initialize the attributes array |
| 31 | */ |
| 32 | private function init() { |
| 33 | if ( $this->attributes === null ) { |
| 34 | $func = $this->interpreter; |
| 35 | $this->attributes = $func( $this->data ); |
| 36 | // @phan-suppress-next-line PhanTypeMismatchPropertyProbablyReal |
| 37 | $this->interpreter = null; |
| 38 | $this->data = null; |
| 39 | } |
| 40 | } |
| 41 | |
| 42 | public function offsetExists( $offset ): bool { |
| 43 | if ( $this->attributes === null ) { |
| 44 | $this->init(); |
| 45 | } |
| 46 | return isset( $this->attributes[$offset] ); |
| 47 | } |
| 48 | |
| 49 | public function &offsetGet( $offset ): string { |
| 50 | if ( $this->attributes === null ) { |
| 51 | $this->init(); |
| 52 | } |
| 53 | return $this->attributes[$offset]; |
| 54 | } |
| 55 | |
| 56 | public function offsetSet( $offset, $value ): void { |
| 57 | if ( $this->attributes === null ) { |
| 58 | $this->init(); |
| 59 | } |
| 60 | $this->attributes[$offset] = $value; |
| 61 | if ( $this->attrObjects !== null ) { |
| 62 | $this->attrObjects[$offset] = new Attribute( $offset, null, null, $offset, $value ); |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | public function offsetUnset( $offset ): void { |
| 67 | if ( $this->attributes === null ) { |
| 68 | $this->init(); |
| 69 | } |
| 70 | unset( $this->attributes[$offset] ); |
| 71 | unset( $this->attrObjects[$offset] ); |
| 72 | } |
| 73 | |
| 74 | public function getValues() { |
| 75 | if ( $this->attributes === null ) { |
| 76 | $this->init(); |
| 77 | } |
| 78 | return $this->attributes; |
| 79 | } |
| 80 | |
| 81 | public function getObjects() { |
| 82 | if ( $this->attrObjects === null ) { |
| 83 | if ( $this->attributes === null ) { |
| 84 | $this->init(); |
| 85 | } |
| 86 | $result = []; |
| 87 | foreach ( $this->attributes as $name => $value ) { |
| 88 | $result[$name] = new Attribute( $name, null, null, $name, $value ); |
| 89 | } |
| 90 | $this->attrObjects = $result; |
| 91 | } |
| 92 | return $this->attrObjects; |
| 93 | } |
| 94 | |
| 95 | public function count(): int { |
| 96 | if ( $this->attributes === null ) { |
| 97 | return count( $this->data ); |
| 98 | } |
| 99 | return count( $this->attributes ); |
| 100 | } |
| 101 | |
| 102 | public function getIterator(): \ArrayIterator { |
| 103 | if ( $this->attributes === null ) { |
| 104 | $this->init(); |
| 105 | } |
| 106 | return new \ArrayIterator( $this->attributes ); |
| 107 | } |
| 108 | |
| 109 | public function merge( Attributes $other ) { |
| 110 | if ( $this->attributes === null ) { |
| 111 | $this->init(); |
| 112 | } |
| 113 | foreach ( $other as $name => $value ) { |
| 114 | if ( !isset( $this->attributes[$name] ) ) { |
| 115 | $this->attributes[$name] = $value; |
| 116 | } |
| 117 | } |
| 118 | } |
| 119 | |
| 120 | public function clone() { |
| 121 | return $this; |
| 122 | } |
| 123 | } |