If $silent is disabled, an exception is thrown for invalid callbacks
/**
* @param mixed $content
* @param bool $includeTextNodes
* @param int $limit
* @return array|\Traversable null
*/
private function getNodeList($content, $includeTextNodes = TRUE, $limit = -1)
{
if ($callback = Constraints::isCallable($content)) {
$content = $callback();
}
if ($content instanceof \DOMElement) {
return array($content);
} elseif ($includeTextNodes && Constraints::isNode($content)) {
return array($content);
} elseif (Constraints::isNodeList($content)) {
return $this->getLimitedArray($content, $limit);
}
return NULL;
}
/**
* Execute a function within the context of every matched element.
*
* If $elementsOnly is a callable the return value defines if
* it is called for that node.
*
* If $elementsOnly is set to TRUE, only element nodes are used.
*
* @param callable $function
* @param callable|bool|NULL $elementsFilter
* @return $this
*/
public function each(callable $function, $elementsFilter = NULL)
{
if (TRUE === $elementsFilter) {
$filter = function ($node) {
return $node instanceof \DOMElement;
};
} else {
$filter = Constraints::isCallable($elementsFilter);
}
foreach ($this->_nodes as $index => $node) {
if (NULL === $filter || $filter($node, $index)) {
call_user_func($function, $node, $index);
}
}
return $this;
}
/**
* Adds the specified classes if the switch is TRUE,
* removes the specified classes if the switch is FALSE,
* toggles the specified classes if the switch is NULL.
*
* @example toggleClass.php Usage Example: FluentDOM\Query::toggleClass()
* @param string|callable $class
* @param NULL|boolean $switch toggle if NULL, add if TRUE, remove if FALSE
* @return Query
*/
public function toggleClass($class, $switch = NULL)
{
$callback = Constraints::isCallable($class);
$this->each(function (\DOMElement $node, $index) use($class, $switch, $callback) {
if ($callback) {
$classString = $callback($node, $index, $node->getAttribute('class'));
} else {
$classString = $class;
}
if (empty($classString) && !(bool) $switch) {
if ($node->hasAttribute('class')) {
$node->removeAttribute('class');
}
} else {
$modified = $this->changeClassString($node->getAttribute('class'), $classString, $switch);
if (FALSE !== $modified) {
if (empty($modified)) {
$node->removeAttribute('class');
} else {
$node->setAttribute('class', $modified);
}
}
}
}, TRUE);
return $this;
}
