public static function formatDOMElement(\DOMElement $root, $indentBase = '')
{
if (!is_string($indentBase)) {
throw new \InvalidArgumentException('Invalid input parameters');
}
// check what this element contains
$fullText = '';
// all text in this element
$textNodes = array();
// text nodes which should be deleted
$childNodes = array();
// other child nodes
for ($i = 0; $i < $root->childNodes->length; $i++) {
$child = $root->childNodes->item($i);
if ($child instanceof \DOMText) {
$textNodes[] = $child;
$fullText .= $child->wholeText;
} elseif ($child instanceof \DOMComment || $child instanceof \DOMElement) {
$childNodes[] = $child;
} else {
// unknown node type. We don't know how to format this
return;
}
}
$fullText = trim($fullText);
if (strlen($fullText) > 0) {
// we contain textelf
$hasText = true;
} else {
$hasText = false;
}
$hasChildNode = count($childNodes) > 0;
if ($hasText && $hasChildNode) {
// element contains both text and child nodes - we don't know how to format this one
return;
}
// remove text nodes
foreach ($textNodes as $node) {
$root->removeChild($node);
}
if ($hasText) {
// only text - add a single text node to the element with the full text
$root->appendChild(new \DOMText($fullText));
return;
}
if (!$hasChildNode) {
// empty node. Nothing to do
return;
}
/* Element contains only child nodes - add indentation before each one, and
* format child elements.
*/
$childIndentation = $indentBase . ' ';
foreach ($childNodes as $node) {
// add indentation before node
$root->insertBefore(new \DOMText("\n" . $childIndentation), $node);
// format child elements
if ($node instanceof \DOMElement) {
self::formatDOMElement($node, $childIndentation);
}
}
// add indentation before closing tag
$root->appendChild(new \DOMText("\n" . $indentBase));
}
