82 lines
1.8 KiB
PHP
82 lines
1.8 KiB
PHP
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<?php
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// StringIterator.php
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// Created: 2022-02-02
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// Updated: 2022-02-02
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namespace Index;
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use Iterator;
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/**
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* Provides an iterator for IString types.
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*/
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class StringIterator implements Iterator {
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private IString $value;
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private int $length;
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private int $index = 0;
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private bool $wasValid = false;
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/**
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* Creates the iterator.
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*
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* @param IString $string String to iterate.
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*/
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public function __construct(IString $string) {
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$this->value = $string;
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$this->length = $string->getLength();
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}
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/**
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* Returns the current character.
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*
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* @see https://www.php.net/manual/en/iterator.current.php
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* @return mixed Current character.
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*/
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public function current(): mixed {
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return $this->value[$this->index];
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}
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/**
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* Returns the index of the current character.
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*
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* @see https://www.php.net/manual/en/iterator.key.php
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* @return int Index of the current character.
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*/
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public function key(): mixed {
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return $this->index;
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}
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/**
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* Move forward to the next character.
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*
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* @see https://www.php.net/manual/en/iterator.next.php
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*/
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public function next(): void {
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$next = $this->index + 1;
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$this->wasValid = $next < $this->length;
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if($this->wasValid)
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$this->index = $next;
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}
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/**
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* Rewind to the first character.
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*
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* @see https://www.php.net/manual/en/iterator.rewind.php
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*/
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public function rewind(): void {
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$this->index = 0;
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$this->wasValid = true;
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}
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/**
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* Checks if the current index is valid.
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*
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* @see https://www.php.net/manual/en/iterator.rewind.php
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* @return bool Whether the current index is valid.
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*/
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public function valid(): bool {
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return $this->wasValid;
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}
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}
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