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<?php
namespace ipl\Stdlib\Filter;
use ArrayIterator;
use Countable;
use IteratorAggregate;
use OutOfBoundsException;
use Traversable;
abstract class Chain implements Rule, MetaDataProvider, IteratorAggregate, Countable
{
use MetaData;
/** @var array<int, Rule> */
protected $rules = [];
/**
* Create a new Chain
*
* @param Rule ...$rules
*/
public function __construct(Rule ...$rules)
{
foreach ($rules as $rule) {
$this->add($rule);
}
}
/**
* Clone this chain's meta data and rules
*/
public function __clone()
{
if ($this->metaData !== null) {
$this->metaData = clone $this->metaData;
}
foreach ($this->rules as $i => $rule) {
$this->rules[$i] = clone $rule;
}
}
/**
* Get an iterator this chain's rules
*
* @return ArrayIterator<int, Rule>
*/
public function getIterator(): Traversable
{
return new ArrayIterator($this->rules);
}
/**
* Add a rule to this chain
*
* @param Rule $rule
*
* @return $this
*/
public function add(Rule $rule)
{
$this->rules[] = $rule;
return $this;
}
/**
* Prepend a rule to an existing rule in this chain
*
* @param Rule $rule
* @param Rule $before
*
* @throws OutOfBoundsException In case no existing rule is found
* @return $this
*/
public function insertBefore(Rule $rule, Rule $before)
{
$ruleAt = array_search($before, $this->rules, true);
if ($ruleAt === false) {
throw new OutOfBoundsException('Reference rule not found');
}
array_splice($this->rules, $ruleAt, 0, [$rule]);
return $this;
}
/**
* Append a rule to an existing rule in this chain
*
* @param Rule $rule
* @param Rule $after
*
* @throws OutOfBoundsException In case no existing rule is found
* @return $this
*/
public function insertAfter(Rule $rule, Rule $after)
{
$ruleAt = array_search($after, $this->rules, true);
if ($ruleAt === false) {
throw new OutOfBoundsException('Reference rule not found');
}
array_splice($this->rules, $ruleAt + 1, 0, [$rule]);
return $this;
}
/**
* Get whether this chain contains the given rule
*
* @param Rule $rule
*
* @return bool
*/
public function has(Rule $rule)
{
return array_search($rule, $this->rules, true) !== false;
}
/**
* Replace a rule with another one in this chain
*
* @param Rule $rule
* @param Rule $replacement
*
* @throws OutOfBoundsException In case no existing rule is found
* @return $this
*/
public function replace(Rule $rule, Rule $replacement)
{
$ruleAt = array_search($rule, $this->rules, true);
if ($ruleAt === false) {
throw new OutOfBoundsException('Rule to replace not found');
}
array_splice($this->rules, $ruleAt, 1, [$replacement]);
return $this;
}
/**
* Remove a rule from this chain
*
* @param Rule $rule
*
* @return $this
*/
public function remove(Rule $rule)
{
$ruleAt = array_search($rule, $this->rules, true);
if ($ruleAt !== false) {
array_splice($this->rules, $ruleAt, 1, []);
}
return $this;
}
/**
* Get whether this chain has any rules
*
* @return bool
*/
public function isEmpty()
{
return empty($this->rules);
}
/**
* Count this chain's rules
*
* @return int
*/
public function count(): int
{
return count($this->rules);
}
}
|
