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<?php
/** @file recursiveiteratoriterator.inc
* @ingroup SPL
* @brief class RecursiveIteratorIterator
* @author Marcus Boerger
* @date 2003 - 2009
*
* SPL - Standard PHP Library
*/
/**
* @brief Iterates through recursive iterators
* @author Marcus Boerger
* @version 1.2
* @since PHP 5.0
*
* The objects of this class are created by instances of RecursiveIterator.
* Elements of those iterators may be traversable themselves. If so these
* sub elements are recursed into.
*/
class RecursiveIteratorIterator implements OuterIterator
{
/** Mode: Only show leaves */
const LEAVES_ONLY = 0;
/** Mode: Show parents prior to their children */
const SELF_FIRST = 1;
/** Mode: Show all children prior to their parent */
const CHILD_FIRST = 2;
/** Flag: Catches exceptions during getChildren() calls and simply jumps
* to the next element. */
const CATCH_GET_CHILD = 0x00000002;
private $ait = array();
private $count = 0;
private $mode = self::LEAVES_ONLY;
private $flags = 0;
/** Construct from RecursiveIterator
*
* @param it RecursiveIterator to iterate
* @param mode Operation mode (one of):
* - LEAVES_ONLY only show leaves
* - SELF_FIRST show parents prior to their childs
* - CHILD_FIRST show all children prior to their parent
* @param flags Control flags, zero or any combination of the following
* (since PHP 5.1).
* - CATCH_GET_CHILD which catches exceptions during
* getChildren() calls and simply jumps to the next
* element.
*/
function __construct(RecursiveIterator $it, $mode = self::LEAVES_ONLY, $flags = 0)
{
$this->ait[0] = $it;
$this->mode = $mode;
$this->flags = $flags;
}
/** Rewind to top iterator as set in constructor
*/
function rewind()
{
while ($this->count) {
unset($this->ait[$this->count--]);
$this->endChildren();
}
$this->ait[0]->rewind();
$this->ait[0]->recursed = false;
callNextElement(true);
}
/** @return whether iterator is valid
*/
function valid()
{
$count = $this->count;
while ($count) {
$it = $this->ait[$count];
if ($it->valid()) {
return true;
}
$count--;
$this->endChildren();
}
return false;
}
/** @return current key
*/
function key()
{
$it = $this->ait[$this->count];
return $it->key();
}
/** @return current element
*/
function current()
{
$it = $this->ait[$this->count];
return $it->current();
}
/** Forward to next element
*/
function next()
{
while ($this->count) {
$it = $this->ait[$this->count];
if ($it->valid()) {
if (!$it->recursed && callHasChildren()) {
$it->recursed = true;
try
{
$sub = callGetChildren();
}
catch (Exception $e)
{
if (!($this->flags & self::CATCH_GET_CHILD))
{
throw $e;
}
$it->next();
continue;
}
$sub->recursed = false;
$sub->rewind();
if ($sub->valid()) {
$this->ait[++$this->count] = $sub;
if (!$sub instanceof RecursiveIterator) {
throw new Exception(get_class($sub).'::getChildren() must return an object that implements RecursiveIterator');
}
$this->beginChildren();
return;
}
unset($sub);
}
$it->next();
$it->recursed = false;
if ($it->valid()) {
return;
}
$it->recursed = false;
}
if ($this->count) {
unset($this->ait[$this->count--]);
$it = $this->ait[$this->count];
$this->endChildren();
callNextElement(false);
}
}
callNextElement(true);
}
/** @return Sub Iterator at given level or if unspecified the current sub
* Iterator
*/
function getSubIterator($level = NULL)
{
if (is_null($level)) {
$level = $this->count;
}
return @$this->ait[$level];
}
/**
* @return The inner iterator
*/
function getInnerIterator()
{
return $this->it;
}
/** @return Current Depth (Number of parents)
*/
function getDepth()
{
return $this->level;
}
/** @return whether current sub iterators current element has children
* @since PHP 5.1
*/
function callHasChildren()
{
return $this->ait[$this->count]->hasChildren();
}
/** @return current sub iterators current children
* @since PHP 5.1
*/
function callGetChildren()
{
return $this->ait[$this->count]->getChildren();
}
/** Called right after calling getChildren() and its rewind().
* @since PHP 5.1
*/
function beginChildren()
{
}
/** Called after current child iterator is invalid and right before it
* gets destructed.
* @since PHP 5.1
*/
function endChildren()
{
}
private function callNextElement($after_move)
{
if ($this->valid())
{
if ($after_move)
{
if (($this->mode == self::SELF_FIRST && $this->callHasChildren())
|| $this->mode == self::LEAVES_ONLY)
$this->nextElement();
}
else
{
$this->nextElement();
}
}
}
/** Called when the next element is available
*/
function nextElement()
{
}
}
?>
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