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| 1 | <?php |
| 2 | /** |
| 3 | * @file |
| 4 | * @license https://opensource.org/licenses/Apache-2.0 Apache-2.0 |
| 5 | */ |
| 6 | |
| 7 | namespace Wikimedia\CSS\Objects; |
| 8 | |
| 9 | use ArrayAccess; |
| 10 | use Countable; |
| 11 | use InvalidArgumentException; |
| 12 | use OutOfBoundsException; |
| 13 | use SeekableIterator; |
| 14 | use Wikimedia\CSS\Util; |
| 15 | |
| 16 | /** |
| 17 | * Represent a list of CSS objects |
| 18 | */ |
| 19 | class CSSObjectList implements Countable, SeekableIterator, ArrayAccess, CSSObject { |
| 20 | |
| 21 | /** @var string The specific class of object contained */ |
| 22 | protected static $objectType; |
| 23 | |
| 24 | /** @var CSSObject[] The objects contained */ |
| 25 | protected $objects; |
| 26 | |
| 27 | /** @var int */ |
| 28 | protected $offset = 0; |
| 29 | |
| 30 | /** |
| 31 | * Additional validation for objects |
| 32 | * @param CSSObject[] $objects |
| 33 | */ |
| 34 | protected static function testObjects( array $objects ) { |
| 35 | } |
| 36 | |
| 37 | /** |
| 38 | * @param CSSObject[] $objects |
| 39 | */ |
| 40 | public function __construct( array $objects = [] ) { |
| 41 | Util::assertAllInstanceOf( $objects, static::$objectType, static::class ); |
| 42 | static::testObjects( $objects ); |
| 43 | $this->objects = array_values( $objects ); |
| 44 | } |
| 45 | |
| 46 | /** |
| 47 | * Insert one or more objects into the list |
| 48 | * @param CSSObject|CSSObject[]|CSSObjectList $objects An object to add, or an array of objects. |
| 49 | * @param int|null $index Insert the objects at this index. If omitted, the |
| 50 | * objects are added at the end. |
| 51 | */ |
| 52 | public function add( $objects, $index = null ) { |
| 53 | if ( $objects instanceof static ) { |
| 54 | $objects = $objects->objects; |
| 55 | } elseif ( is_array( $objects ) ) { |
| 56 | Util::assertAllInstanceOf( $objects, static::$objectType, static::class ); |
| 57 | $objects = array_values( $objects ); |
| 58 | static::testObjects( $objects ); |
| 59 | } else { |
| 60 | if ( !$objects instanceof static::$objectType ) { |
| 61 | throw new InvalidArgumentException( |
| 62 | static::class . ' may only contain instances of ' . static::$objectType . '.' |
| 63 | ); |
| 64 | } |
| 65 | $objects = [ $objects ]; |
| 66 | static::testObjects( $objects ); |
| 67 | } |
| 68 | |
| 69 | if ( $index === null ) { |
| 70 | $index = count( $this->objects ); |
| 71 | } elseif ( $index < 0 || $index > count( $this->objects ) ) { |
| 72 | throw new OutOfBoundsException( 'Index is out of range.' ); |
| 73 | } |
| 74 | |
| 75 | array_splice( $this->objects, $index, 0, $objects ); |
| 76 | if ( $this->offset > $index ) { |
| 77 | $this->offset += count( $objects ); |
| 78 | } |
| 79 | } |
| 80 | |
| 81 | /** |
| 82 | * Remove an object from the list |
| 83 | * @param int $index |
| 84 | * @return CSSObject The removed object |
| 85 | */ |
| 86 | public function remove( $index ) { |
| 87 | if ( $index < 0 || $index >= count( $this->objects ) ) { |
| 88 | throw new OutOfBoundsException( 'Index is out of range.' ); |
| 89 | } |
| 90 | $ret = $this->objects[$index]; |
| 91 | array_splice( $this->objects, $index, 1 ); |
| 92 | |
| 93 | // This works most sanely with foreach() and removing the current index |
| 94 | if ( $this->offset >= $index ) { |
| 95 | $this->offset--; |
| 96 | } |
| 97 | |
| 98 | return $ret; |
| 99 | } |
| 100 | |
| 101 | /** |
| 102 | * Extract a slice of the list |
| 103 | * @param int $offset |
| 104 | * @param int|null $length |
| 105 | * @return CSSObject[] The objects in the slice |
| 106 | */ |
| 107 | public function slice( $offset, $length = null ) { |
| 108 | return array_slice( $this->objects, $offset, $length ); |
| 109 | } |
| 110 | |
| 111 | /** |
| 112 | * Clear the list |
| 113 | */ |
| 114 | public function clear() { |
| 115 | $this->objects = []; |
| 116 | $this->offset = 0; |
| 117 | } |
| 118 | |
| 119 | // Countable interface |
| 120 | |
| 121 | /** @inheritDoc */ |
| 122 | public function count(): int { |
| 123 | return count( $this->objects ); |
| 124 | } |
| 125 | |
| 126 | // SeekableIterator interface |
| 127 | |
| 128 | /** @inheritDoc */ |
| 129 | public function seek( int $offset ): void { |
| 130 | if ( $offset < 0 || $offset >= count( $this->objects ) ) { |
| 131 | throw new OutOfBoundsException( 'Offset is out of range.' ); |
| 132 | } |
| 133 | $this->offset = $offset; |
| 134 | } |
| 135 | |
| 136 | /** @inheritDoc */ |
| 137 | #[\ReturnTypeWillChange] |
| 138 | public function current() { |
| 139 | return $this->objects[$this->offset] ?? null; |
| 140 | } |
| 141 | |
| 142 | /** @inheritDoc */ |
| 143 | public function key(): int { |
| 144 | return $this->offset; |
| 145 | } |
| 146 | |
| 147 | /** @inheritDoc */ |
| 148 | public function next(): void { |
| 149 | $this->offset++; |
| 150 | } |
| 151 | |
| 152 | /** @inheritDoc */ |
| 153 | public function rewind(): void { |
| 154 | $this->offset = 0; |
| 155 | } |
| 156 | |
| 157 | /** @inheritDoc */ |
| 158 | public function valid(): bool { |
| 159 | return isset( $this->objects[$this->offset] ); |
| 160 | } |
| 161 | |
| 162 | // ArrayAccess interface |
| 163 | |
| 164 | /** @inheritDoc */ |
| 165 | public function offsetExists( $offset ): bool { |
| 166 | return isset( $this->objects[$offset] ); |
| 167 | } |
| 168 | |
| 169 | /** @inheritDoc */ |
| 170 | public function offsetGet( $offset ): CSSObject { |
| 171 | if ( !is_numeric( $offset ) || (float)(int)$offset !== (float)$offset ) { |
| 172 | throw new InvalidArgumentException( 'Offset must be an integer.' ); |
| 173 | } |
| 174 | if ( $offset < 0 || $offset > count( $this->objects ) ) { |
| 175 | throw new OutOfBoundsException( 'Offset is out of range.' ); |
| 176 | } |
| 177 | return $this->objects[$offset]; |
| 178 | } |
| 179 | |
| 180 | /** @inheritDoc */ |
| 181 | public function offsetSet( $offset, $value ): void { |
| 182 | if ( !$value instanceof static::$objectType ) { |
| 183 | throw new InvalidArgumentException( |
| 184 | static::class . ' may only contain instances of ' . static::$objectType . '.' |
| 185 | ); |
| 186 | } |
| 187 | static::testObjects( [ $value ] ); |
| 188 | if ( !is_numeric( $offset ) || (float)(int)$offset !== (float)$offset ) { |
| 189 | throw new InvalidArgumentException( 'Offset must be an integer.' ); |
| 190 | } |
| 191 | if ( $offset < 0 || $offset > count( $this->objects ) ) { |
| 192 | throw new OutOfBoundsException( 'Offset is out of range.' ); |
| 193 | } |
| 194 | $this->objects[$offset] = $value; |
| 195 | } |
| 196 | |
| 197 | /** @inheritDoc */ |
| 198 | public function offsetUnset( $offset ): void { |
| 199 | if ( isset( $this->objects[$offset] ) && $offset !== count( $this->objects ) - 1 ) { |
| 200 | throw new OutOfBoundsException( 'Cannot leave holes in the list.' ); |
| 201 | } |
| 202 | unset( $this->objects[$offset] ); |
| 203 | } |
| 204 | |
| 205 | // CSSObject interface |
| 206 | |
| 207 | /** @inheritDoc */ |
| 208 | public function getPosition() { |
| 209 | $ret = null; |
| 210 | foreach ( $this->objects as $obj ) { |
| 211 | $pos = $obj->getPosition(); |
| 212 | if ( $pos[0] >= 0 && ( |
| 213 | !$ret || $pos[0] < $ret[0] || ( $pos[0] === $ret[0] && $pos[1] < $ret[1] ) |
| 214 | ) ) { |
| 215 | $ret = $pos; |
| 216 | } |
| 217 | } |
| 218 | return $ret ?: [ -1, -1 ]; |
| 219 | } |
| 220 | |
| 221 | /** |
| 222 | * Return the tokens to use to separate list items |
| 223 | * @param CSSObject $left |
| 224 | * @param CSSObject|null $right |
| 225 | * @return Token[] |
| 226 | */ |
| 227 | protected function getSeparator( CSSObject $left, CSSObject $right = null ) { |
| 228 | return []; |
| 229 | } |
| 230 | |
| 231 | /** |
| 232 | * @param string $function Function to call, toTokenArray() or toComponentValueArray() |
| 233 | * @return Token[]|ComponentValue[] |
| 234 | */ |
| 235 | private function toTokenOrCVArray( $function ) { |
| 236 | $ret = []; |
| 237 | $l = count( $this->objects ); |
| 238 | foreach ( $this->objects as $i => $iValue ) { |
| 239 | // Manually looping and appending turns out to be noticeably faster than array_merge. |
| 240 | foreach ( $iValue->$function() as $v ) { |
| 241 | $ret[] = $v; |
| 242 | } |
| 243 | $sep = $this->getSeparator( $iValue, $i + 1 < $l ? $this->objects[$i + 1] : null ); |
| 244 | foreach ( $sep as $v ) { |
| 245 | $ret[] = $v; |
| 246 | } |
| 247 | } |
| 248 | |
| 249 | return $ret; |
| 250 | } |
| 251 | |
| 252 | /** @inheritDoc */ |
| 253 | public function toTokenArray() { |
| 254 | return $this->toTokenOrCVArray( __FUNCTION__ ); |
| 255 | } |
| 256 | |
| 257 | /** @inheritDoc */ |
| 258 | public function toComponentValueArray() { |
| 259 | return $this->toTokenOrCVArray( __FUNCTION__ ); |
| 260 | } |
| 261 | |
| 262 | public function __toString() { |
| 263 | return Util::stringify( $this ); |
| 264 | } |
| 265 | } |