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%PDF-
Mini Shell
Mini Shell
<?php
/**
* This file is part of the Latte (https://latte.nette.org)
* Copyright (c) 2008 David Grudl (https://davidgrudl.com)
*/
declare(strict_types=1);
namespace Latte\Runtime;
use Latte;
/**
* Smarter caching iterator.
*
* @property-read bool $first
* @property-read bool $last
* @property-read bool $empty
* @property-read bool $odd
* @property-read bool $even
* @property-read int $counter
* @property-read int $counter0
* @property-read mixed $nextKey
* @property-read mixed $nextValue
* @property-read ?self $parent
* @internal
*/
class CachingIterator extends \CachingIterator implements \Countable
{
use Latte\Strict;
/** @var int */
private $counter = 0;
/** @var self|null */
private $parent;
/**
* @param array|\Traversable|\stdClass|mixed $iterator
*/
public function __construct($iterator, ?self $parent = null)
{
if (is_array($iterator) || $iterator instanceof \stdClass) {
$iterator = new \ArrayIterator($iterator);
} elseif ($iterator instanceof \IteratorAggregate) {
do {
$iterator = $iterator->getIterator();
} while (!$iterator instanceof \Iterator);
} elseif ($iterator instanceof \Traversable) {
if (!$iterator instanceof \Iterator) {
$iterator = new \IteratorIterator($iterator);
}
} else {
throw new \InvalidArgumentException(sprintf('Invalid argument passed to foreach; array or Traversable expected, %s given.', is_object($iterator) ? get_class($iterator) : gettype($iterator)));
}
parent::__construct($iterator, 0);
$this->parent = $parent;
}
/**
* Is the current element the first one?
*/
public function isFirst(?int $width = null): bool
{
return $this->counter === 1 || ($width && $this->counter !== 0 && (($this->counter - 1) % $width) === 0);
}
/**
* Is the current element the last one?
*/
public function isLast(?int $width = null): bool
{
return !$this->hasNext() || ($width && ($this->counter % $width) === 0);
}
/**
* Is the iterator empty?
*/
public function isEmpty(): bool
{
return $this->counter === 0;
}
/**
* Is the counter odd?
*/
public function isOdd(): bool
{
return $this->counter % 2 === 1;
}
/**
* Is the counter even?
*/
public function isEven(): bool
{
return $this->counter % 2 === 0;
}
/**
* Returns the 1-indexed counter.
*/
public function getCounter(): int
{
return $this->counter;
}
/**
* Returns the 0-indexed counter.
*/
public function getCounter0(): int
{
return max(0, $this->counter - 1);
}
/**
* Decrements counter.
*/
public function skipRound(): void
{
$this->counter = max($this->counter - 1, 0);
}
/**
* Returns the counter as string
*/
public function __toString(): string
{
return (string) $this->counter;
}
/**
* Returns the count of elements.
*/
public function count(): int
{
$inner = $this->getInnerIterator();
if ($inner instanceof \Countable) {
return $inner->count();
} else {
throw new \LogicException('Iterator is not countable.');
}
}
/**
* Forwards to the next element.
*/
public function next(): void
{
parent::next();
if (parent::valid()) {
$this->counter++;
}
}
/**
* Rewinds the Iterator.
*/
public function rewind(): void
{
parent::rewind();
$this->counter = parent::valid() ? 1 : 0;
}
/**
* Returns the next key or null if position is not valid.
* @return mixed
*/
public function getNextKey()
{
$iterator = $this->getInnerIterator();
return $iterator->valid() ? $iterator->key() : null;
}
/**
* Returns the next element or null if position is not valid.
* @return mixed
*/
public function getNextValue()
{
$iterator = $this->getInnerIterator();
return $iterator->valid() ? $iterator->current() : null;
}
/**
* Returns the iterator surrounding the current one.
*/
public function getParent(): ?self
{
return $this->parent;
}
/********************* property accessor ****************d*g**/
/**
* Returns property value.
* @return mixed
* @throws \LogicException if the property is not defined.
*/
public function &__get(string $name)
{
if (method_exists($this, $m = 'get' . $name) || method_exists($this, $m = 'is' . $name)) {
$ret = $this->$m();
return $ret;
}
throw new \LogicException('Attempt to read undeclared property ' . static::class . "::\$$name.");
}
/**
* Is property defined?
*/
public function __isset(string $name): bool
{
return method_exists($this, 'get' . $name) || method_exists($this, 'is' . $name);
}
}
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