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| 1 | <?php |
| 2 | /** |
| 3 | * @license GPL-2.0-or-later |
| 4 | * @file |
| 5 | */ |
| 6 | |
| 7 | namespace Wikimedia\StringUtils; |
| 8 | |
| 9 | use Iterator; |
| 10 | |
| 11 | /** |
| 12 | * An iterator which works exactly like: |
| 13 | * |
| 14 | * foreach ( explode( $delim, $s ) as $element ) { |
| 15 | * ... |
| 16 | * } |
| 17 | * |
| 18 | * Except it doesn't use 193 byte per element |
| 19 | */ |
| 20 | class ExplodeIterator implements Iterator { |
| 21 | /** @var string */ |
| 22 | private $subject; |
| 23 | |
| 24 | /** @var int */ |
| 25 | private $subjectLength; |
| 26 | |
| 27 | /** @var string */ |
| 28 | private $delim; |
| 29 | |
| 30 | /** @var int */ |
| 31 | private $delimLength; |
| 32 | |
| 33 | /** @var int|false The position of the start of the line */ |
| 34 | private $curPos; |
| 35 | |
| 36 | /** @var int|false The position after the end of the next delimiter */ |
| 37 | private $endPos; |
| 38 | |
| 39 | /** @var string|false The current token */ |
| 40 | private $current; |
| 41 | |
| 42 | /** |
| 43 | * Construct a DelimIterator |
| 44 | * @param string $delim |
| 45 | * @param string $subject |
| 46 | */ |
| 47 | public function __construct( $delim, $subject ) { |
| 48 | $this->subject = $subject; |
| 49 | $this->delim = $delim; |
| 50 | |
| 51 | // Micro-optimisation (theoretical) |
| 52 | $this->subjectLength = strlen( $subject ); |
| 53 | $this->delimLength = strlen( $delim ); |
| 54 | |
| 55 | $this->rewind(); |
| 56 | } |
| 57 | |
| 58 | public function rewind(): void { |
| 59 | $this->curPos = 0; |
| 60 | $this->endPos = strpos( $this->subject, $this->delim ); |
| 61 | $this->refreshCurrent(); |
| 62 | } |
| 63 | |
| 64 | public function refreshCurrent() { |
| 65 | if ( $this->curPos === false ) { |
| 66 | $this->current = false; |
| 67 | } elseif ( $this->curPos >= $this->subjectLength ) { |
| 68 | $this->current = ''; |
| 69 | } elseif ( $this->endPos === false ) { |
| 70 | $this->current = substr( $this->subject, $this->curPos ); |
| 71 | } else { |
| 72 | $this->current = substr( $this->subject, $this->curPos, $this->endPos - $this->curPos ); |
| 73 | } |
| 74 | } |
| 75 | |
| 76 | /** |
| 77 | * @return string|false |
| 78 | */ |
| 79 | #[\ReturnTypeWillChange] |
| 80 | public function current() { |
| 81 | return $this->current; |
| 82 | } |
| 83 | |
| 84 | /** |
| 85 | * @return int|false Current position or boolean false if invalid |
| 86 | */ |
| 87 | #[\ReturnTypeWillChange] |
| 88 | public function key() { |
| 89 | return $this->curPos; |
| 90 | } |
| 91 | |
| 92 | public function next(): void { |
| 93 | if ( $this->endPos === false ) { |
| 94 | $this->curPos = false; |
| 95 | } else { |
| 96 | $this->curPos = $this->endPos + $this->delimLength; |
| 97 | if ( $this->curPos >= $this->subjectLength ) { |
| 98 | $this->endPos = false; |
| 99 | } else { |
| 100 | $this->endPos = strpos( $this->subject, $this->delim, $this->curPos ); |
| 101 | } |
| 102 | } |
| 103 | $this->refreshCurrent(); |
| 104 | } |
| 105 | |
| 106 | public function valid(): bool { |
| 107 | return $this->curPos !== false; |
| 108 | } |
| 109 | } |
| 110 | |
| 111 | /** @deprecated class alias since 1.44 */ |
| 112 | class_alias( ExplodeIterator::class, 'ExplodeIterator' ); |