protected function extractChildElements(\DOMNode $elem, $skipWhitespace = false, $parentIsBlock = false)
{
/** @var \DOMNode $child */
$first = true;
foreach ($elem->childNodes as $child) {
if ($skipWhitespace && $child->nodeName === '#text' && ctype_space($child->nodeValue)) {
// do nothing
} elseif ($child->nodeName === '#text') {
$this->elements[] = new ElementEvent(ElementEvents::TEXT, $this->normalizeSpace($child->nodeValue, $parentIsBlock && $first), $this->attributes->values());
} else {
switch ($child->nodeName) {
case 'p':
$this->elements[] = new ElementEvent(ElementEvents::PARAGRAPH_START);
$this->extractChildElements($child, false, true);
$this->elements[] = new ElementEvent(ElementEvents::PARAGRAPH_END);
break;
case 'ul':
$this->attributes->setMany(['list_depth' => $this->attributes->get('list_depth', 0) + 1, 'list_numbered' => false]);
$this->elements[] = new ElementEvent(ElementEvents::LIST_START, '', [ElementAttributes::NUMBERED => false]);
$this->extractChildElements($child, true);
$this->elements[] = new ElementEvent(ElementEvents::LIST_END, '', [ElementAttributes::NUMBERED => false]);
$this->attributes->undo();
break;
case 'ol':
$this->attributes->setMany(['list_depth' => $this->attributes->get('list_depth', 0) + 1, 'list_numbered' => true]);
$this->elements[] = new ElementEvent(ElementEvents::LIST_START, '', [ElementAttributes::NUMBERED => true]);
$this->extractChildElements($child, true);
$this->elements[] = new ElementEvent(ElementEvents::LIST_END, '', [ElementAttributes::NUMBERED => true]);
$this->attributes->undo();
break;
case 'li':
$this->elements[] = new ElementEvent(ElementEvents::LIST_ITEM_START, '', [ElementAttributes::DEPTH => $this->attributes['list_depth'] - 1, ElementAttributes::NUMBERED => $this->attributes['list_numbered']]);
$this->extractChildElements($child, false, true);
$this->elements[] = new ElementEvent(ElementEvents::LIST_ITEM_END, '', [ElementAttributes::DEPTH => $this->attributes['list_depth'] - 1, ElementAttributes::NUMBERED => $this->attributes['list_numbered']]);
break;
case 'table':
$this->elements[] = new ElementEvent(ElementEvents::TABLE_START);
$this->extractChildElements($child, true);
$this->elements[] = new ElementEvent(ElementEvents::TABLE_END);
break;
case 'tr':
$this->elements[] = new ElementEvent(ElementEvents::TABLE_ROW_START);
$this->extractChildElements($child, true);
$this->elements[] = new ElementEvent(ElementEvents::TABLE_ROW_END);
break;
case 'th':
case 'td':
$this->elements[] = new ElementEvent(ElementEvents::TABLE_CELL_START, '', [ElementAttributes::HEADER => $child->nodeName === 'th']);
$this->extractChildElements($child);
$this->elements[] = new ElementEvent(ElementEvents::TABLE_CELL_END, '', [ElementAttributes::HEADER => $child->nodeName === 'th']);
break;
case 'tbody':
case 'thead':
$this->extractChildElements($child, true);
break;
case 'h1':
$this->elements[] = new ElementEvent(ElementEvents::TITLE, $this->normalizeSpace($child->nodeValue), [ElementAttributes::DEPTH => 0]);
break;
case 'h2':
$this->elements[] = new ElementEvent(ElementEvents::TITLE, $this->normalizeSpace($child->nodeValue), [ElementAttributes::DEPTH => 1]);
break;
case 'h3':
$this->elements[] = new ElementEvent(ElementEvents::TITLE, $this->normalizeSpace($child->nodeValue), [ElementAttributes::DEPTH => 2]);
break;
case 'h4':
$this->elements[] = new ElementEvent(ElementEvents::TITLE, $this->normalizeSpace($child->nodeValue), [ElementAttributes::DEPTH => 3]);
break;
case 'h5':
$this->elements[] = new ElementEvent(ElementEvents::TITLE, $this->normalizeSpace($child->nodeValue), [ElementAttributes::DEPTH => 4]);
break;
case 'h6':
$this->elements[] = new ElementEvent(ElementEvents::TITLE, $this->normalizeSpace($child->nodeValue), [ElementAttributes::DEPTH => 5]);
break;
case 'div':
$this->extractChildElements($child, true);
break;
case 'span':
$this->extractChildElements($child);
break;
case 'strong':
case 'b':
$this->attributes[ElementAttributes::BOLD] = true;
$this->extractChildElements($child);
$this->attributes->undo();
break;
case 'em':
case 'i':
$this->attributes[ElementAttributes::ITALIC] = true;
$this->extractChildElements($child);
$this->attributes->undo();
break;
case 'u':
$this->attributes[ElementAttributes::UNDERLINE] = 'single';
$this->extractChildElements($child);
$this->attributes->undo();
break;
case 'del':
$this->attributes[ElementAttributes::STRIKETHROUGH] = true;
$this->extractChildElements($child);
$this->attributes->undo();
break;
case 'sup':
$this->attributes[ElementAttributes::SUPERSCRIPT] = true;
$this->extractChildElements($child);
$this->attributes->undo();
break;
case 'sub':
$this->attributes[ElementAttributes::SUBSCRIPT] = true;
$this->extractChildElements($child);
$this->attributes->undo();
break;
case 'a':
$href = $child->attributes->getNamedItem('href')->nodeValue;
$this->attributes[ElementAttributes::LINK] = $href;
$this->elements[] = new ElementEvent(ElementEvents::LINK, $this->normalizeSpace($child->nodeValue), $this->attributes->values());
$this->attributes->undo();
break;
case 'img':
$this->elements[] = new ElementEvent(ElementEvents::IMAGE, $child->attributes->getNamedItem('src')->nodeValue);
break;
default:
throw new \RuntimeException("Element of type {$child->nodeName} not supported");
break;
}
}
$first = false;
}
}
