Block::setAttributes

public function setAttributes($data)
{
	if ($this->access < $this::ACCESS_W)
	{
		$this->error->addError(
			'ACCESS_DENIED',
			Loc::getMessage('LANDING_BLOCK_ACCESS_DENIED')
		);
		return;
	}

	$doc = $this->getDom();
	$manifest = $this->getManifest();
	$wrapper = '#' . $this->getAnchor($this->id);

	// collect allowed attrs
	$allowedAttrs = [];
	self::collectAllowedAttrs($manifest['style']['nodes'], $allowedAttrs);
	self::collectAllowedAttrs($manifest['attrs'], $allowedAttrs);
	self::collectAllowedAttrs($manifest['cards'], $allowedAttrs);
	self::collectAllowedAttrs($manifest['style']['block'], $allowedAttrs);

	// update attrs
	if ($allowedAttrs)
	{
		// all allowed attrs from manifest with main selector ([selector] => [data-test, data-test2])
		foreach ($allowedAttrs as $selector => $allowed)
		{
			// it's not interesting for us, if there is no new data for this selector
			if ((isset($data[$selector]) && is_array($data[$selector])) || isset($data[$wrapper]) )
			{
				// set attrs to the block
				if ($selector === '#wrapper')
				{
					$selector = $wrapper;
				}
				if ($selector == $wrapper)
				{
					$nodesArray = $doc->getChildNodesArray();
					$resultList = [array_pop($nodesArray)];
				}
				// or by selector
				else
				{
					$resultList = $doc->querySelectorAll($selector);
				}
				// external data for changing in allowed attrs
				foreach ($data[$selector] as $attrKey => $attrData)
				{
					// if key without position (compatibility)
					if (!($attrKey == (string)(int)$attrKey))
					{
						$attrData = [$attrKey => $attrData];
						$attrKey = -1;
					}
					if (!is_array($attrData))
					{
						continue;
					}
					// attrs new data in each selector ([data-test] => value)
					foreach ($attrData as $key => $value)
					{
						if (!in_array($key, $allowed))
						{
							continue;
						}
						$key = htmlspecialcharsbx($key);
						$value = is_array($value) ? json_encode($value) : $value;

						// result nodes by main selector
						foreach ($resultList as $pos => $resultNode)
						{
							// if position of node that we try to find
							if ($attrKey == -1 || $attrKey == $pos)
							{
								$valueBefore = $resultNode->getAttribute($key);
								// update node
								$resultNode->setAttribute($key, $value);
								if (History::isActive())
								{
									$history = new History($this->getLandingId(), History::ENTITY_TYPE_LANDING);
									$history->push('EDIT_ATTRIBUTES', [
										'block' => $this,
										'selector' => $selector,
										'isWrapper' => ($selector === $wrapper),
										'attribute' => $key,
										'position' => (int)$attrKey,
										'valueBefore' => $valueBefore,
										'valueAfter' => $value,
									]);
								}
							}
						}
					}
				}
			}
		}
	}

	// save result
	$this->saveContent($doc->saveHTML());
}