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<?php
namespace andreskrey\Readability;
use andreskrey\Readability\NodeClass\DOMDocument;
use andreskrey\Readability\NodeClass\DOMNode;
/**
* Class NodeUtility
* @package andreskrey\Readability
*/
class NodeUtility
{
/**
* @var array
*/
private static $divToPElements = [
'a',
'blockquote',
'dl',
'div',
'img',
'ol',
'p',
'pre',
'table',
'ul',
'select',
];
/**
*
* Imported from the Element class on league\html-to-markdown
*
* @param $node
* @return mixed
*/
public static function nextElement($node)
{
$next = $node;
while ($next
&& $next->nodeName !== '#text'
&& trim($next->textContent)) {
$next = $next->nextSibling;
}
return $next;
}
/**
* Changes the node tag name. Since tagName on DOMElement is a read only value, this must be done creating a new
* element with the new tag name and importing it to the main DOMDocument.
*
* @param string $value
* @param bool $importAttributes
* @return DOMNode
*/
public static function setNodeTag($node, $value, $importAttributes = false)
{
$new = new DOMDocument('1.0', 'utf-8');
$new->appendChild($new->createElement($value));
$children = $node->childNodes;
/** @var $children \DOMNodeList $i */
for ($i = 0; $i < $children->length; $i++) {
$import = $new->importNode($children->item($i), true);
$new->firstChild->appendChild($import);
}
if ($importAttributes) {
// Import attributes from the original node.
foreach ($node->attributes as $attribute) {
$new->firstChild->setAttribute($attribute->nodeName, $attribute->nodeValue);
}
}
// The import must be done on the firstChild of $new, since $new is a DOMDocument and not a DOMElement.
$import = $node->ownerDocument->importNode($new->firstChild, true);
$node->parentNode->replaceChild($import, $node);
return $import;
}
/**
* Removes the current node and returns the next node to be parsed (child, sibling or parent).
*
* @param DOMNode $node
*
* @return DOMNode
*/
public static function removeAndGetNext($node)
{
$nextNode = self::getNextNode($node, true);
$node->parentNode->removeChild($node);
return $nextNode;
}
/**
* Returns the next node. First checks for childs (if the flag allows it), then for siblings, and finally
* for parents.
*
* @param DOMNode $originalNode
* @param bool $ignoreSelfAndKids
*
* @return DOMNode
*/
public static function getNextNode($originalNode, $ignoreSelfAndKids = false)
{
/*
* Traverse the DOM from node to node, starting at the node passed in.
* Pass true for the second parameter to indicate this node itself
* (and its kids) are going away, and we want the next node over.
*
* Calling this in a loop will traverse the DOM depth-first.
*/
// First check for kids if those aren't being ignored
if (!$ignoreSelfAndKids && $originalNode->firstChild) {
return $originalNode->firstChild;
}
// Then for siblings...
if ($originalNode->nextSibling) {
return $originalNode->nextSibling;
}
// And finally, move up the parent chain *and* find a sibling
// (because this is depth-first traversal, we will have already
// seen the parent nodes themselves).
do {
$originalNode = $originalNode->getParent();
} while ($originalNode && !$originalNode->nextSibling);
return ($originalNode) ? $originalNode->nextSibling : $originalNode;
}
/**
* Checks if the current node has a single child and if that child is a P node.
* Useful to convert <div><p> nodes to a single <p> node and avoid confusing the scoring system since div with p
* tags are, in practice, paragraphs.
*
* @param DOMNode $node
*
* @return bool
*/
public static function hasSinglePNode($node)
{
// There should be exactly 1 element child which is a P:
if (count($children = $node->getChildren(true)) !== 1 || $children[0]->nodeName !== 'p') {
return false;
}
// And there should be no text nodes with real content (param true on ->getChildren)
foreach ($children as $child) {
/** @var $child DOMNode */
if ($child->nodeType === XML_TEXT_NODE && !preg_match('/\S$/', $child->getTextContent())) {
return false;
}
}
return true;
}
/**
* @param $node DOMNode
* @return bool
*/
public static function hasSingleChildBlockElement($node)
{
$result = false;
if ($node->hasChildNodes()) {
foreach ($node->getChildren() as $child) {
if (in_array($child->nodeName, self::$divToPElements)) {
$result = true;
} else {
// If any of the hasSingleChildBlockElement calls return true, return true then.
$result = ($result || self::hasSingleChildBlockElement($child));
}
}
}
return $result;
}
/**
* Returns the full text of the node.
*
* @param $node DOMNode
* @param bool $normalize Normalize white space?
* @return string
*/
public static function getTextContent($node, $normalize = false)
{
$nodeValue = $node->nodeValue;
if ($normalize) {
$nodeValue = trim(preg_replace('/\s{2,}/', ' ', $nodeValue));
}
return $nodeValue;
}
}
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