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<?php |
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namespace hemio\html\Trait_; |
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/** |
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* Most required utils to implement elements that can have childs and |
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* containers. Recomended implementation from most of |
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* {@link MaintainsChilds} requirements. |
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* |
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* @uses MaintainsChilds ChildMaintainance is the recommended |
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* implementation from most of MaintainsChilds requirements |
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* @author Michael Herold <[email protected]> |
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* @todo Cleanup |
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*/ |
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trait ChildMaintainance |
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{ |
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/** |
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* child elemnts of the element |
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* @var array |
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*/ |
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private $arrChilds = []; |
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/** |
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* |
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* @var array[callable] |
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*/ |
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protected $arrHooksGainChild = []; |
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public function addHookGainChild(callable $hook, $idx = null) |
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{ |
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if ($idx === null) |
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$this->arrHooksGainChild[] = $hook; |
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else |
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$this->arrHooksGainChild[$idx] = $hook; |
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} |
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/** |
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* |
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* @return integer |
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*/ |
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public function count() |
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{ |
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return count($this->arrChilds); |
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} |
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/** |
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* |
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* @param mixed $offset |
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* @return boolean |
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*/ |
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public function offsetExists($offset) |
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{ |
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return array_key_exists($offset, $this->arrChilds); |
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} |
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/** |
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* |
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* @param mixed $offset |
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* @return Interface_\HtmlCode |
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*/ |
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public function offsetGet($offset) |
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{ |
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return $this->arrChilds[$offset]; |
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} |
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/** |
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* |
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* @param mixed $offset |
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* @param Interface_\HtmlCode $value |
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*/ |
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public function offsetSet($offset, $value) |
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{ |
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if ($this->isValidChild($value) || $value instanceof \hemio\html\Nothing) { |
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if ($offset === null) |
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$this->arrChilds[] = $value; |
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else |
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$this->arrChilds[$offset] = $value; |
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$this->gainChild($value); |
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} else { |
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trigger_error('An instance of `'.get_class($value). |
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'` is no valid child for `'.get_class($this).'`', E_USER_WARNING); |
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} |
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} |
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/** |
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* |
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* @param type $offset |
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*/ |
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public function offsetUnset($offset) |
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{ |
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unset($this->arrChilds[$offset]); |
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} |
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/** |
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* Implements iteration |
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* |
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* @return \Traversable |
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*/ |
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public function getIterator() |
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{ |
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return new \ArrayIterator($this->arrChilds); |
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} |
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/** |
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* |
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* @param callable $selectFilter |
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* @return \Traversable |
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*/ |
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public function getRecursiveIterator(callable $selectFilter = null) |
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{ |
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if ($selectFilter === null) { |
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return new \RecursiveIteratorIterator($this, |
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\RecursiveIteratorIterator::SELF_FIRST); |
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} else { |
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$array = []; |
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foreach ($this->getRecursiveIterator() as $child) { |
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if ($selectFilter($child)) { |
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$array[] = $child; |
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} |
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} |
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return new \ArrayIterator($array); |
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} |
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} |
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/** |
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* |
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* @param \hemio\html\Interface_\HtmlCode $child |
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* @return \hemio\html\Interface_\HtmlCode |
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*/ |
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protected function addChildInternal(\hemio\html\Interface_\HtmlCode $child) |
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{ |
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$this[] = $child; |
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return $child; |
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} |
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/** |
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* |
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* @param \hemio\html\Interface_\HtmlCode $child |
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* @return \hemio\html\Interface_\HtmlCode |
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*/ |
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public function addChildBeginning(\hemio\html\Interface_\HtmlCode $child) |
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{ |
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array_unshift($this->arrChilds, $child); |
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return $child; |
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} |
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/** |
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* |
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* @param \hemio\html\Interface_\HtmlCode $child |
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*/ |
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protected function gainChild(\hemio\html\Interface_\HtmlCode $child) |
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{ |
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foreach ($this->arrHooksGainChild as $hook) { |
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$hook($this, $child); |
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} |
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if ($child instanceof \hemio\html\Abstract_\Element) |
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$child->setParent($this); |
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if ($child instanceof \hemio\html\Interface_\MaintainsAppendages) |
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foreach ($this->getInheritableAppendages() as $appKey => $appValue) |
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$child->leaveInheritableAppendage($appKey, $appValue); |
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} |
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public function __clone() |
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{ |
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foreach ($this->arrChilds as $key => $child) { |
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$this->arrChilds[$key] = clone $child; |
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} |
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} |
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public function valid() |
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{ |
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return current($this->arrChilds) !== false; |
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} |
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public function hasChildren() |
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{ |
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return $this->current() instanceof \RecursiveIterator; |
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} |
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public function next() |
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{ |
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next($this->arrChilds); |
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} |
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public function current() |
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{ |
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return current($this->arrChilds); |
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} |
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public function getChildren() |
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{ |
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return $this->current(); |
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} |
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public function rewind() |
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{ |
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reset($this->arrChilds); |
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} |
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public function key() |
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{ |
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return key($this->arrChilds); |
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} |
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/** |
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* Existence usually ensured via (@link \hemio\html\Interface_\MaintainsChilds) |
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*/ |
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abstract public function isValidChild(\hemio\html\Interface_\HtmlCode $child); |
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/** |
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* Existence usually ensured via (@link \hemio\html\Interface_\MaintainsAppendages) |
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*/ |
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abstract public function getInheritableAppendages(); |
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} |
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