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<?php
/**
* Copyright © Magento, Inc. All rights reserved.
* See COPYING.txt for license details.
*/
namespace Magento\Framework\View\Page\Config\Reader;
use Magento\Framework\View\Layout;
use Magento\Framework\View\Page\Config as PageConfig;
use Magento\Framework\View\Page\Config\Structure;
/**
* Head structure reader is intended for collecting assets, title and metadata
*/
class Head implements Layout\ReaderInterface
{
/**#@+
* Supported types
*/
const TYPE_HEAD = 'head';
/**#@-*/
/**#@+
* Supported head elements
*/
const HEAD_CSS = 'css';
const HEAD_SCRIPT = 'script';
const HEAD_LINK = 'link';
const HEAD_REMOVE = 'remove';
const HEAD_TITLE = 'title';
const HEAD_META = 'meta';
const HEAD_ATTRIBUTE = 'attribute';
private const HEAD_FONT = 'font';
/**#@-*/
/**
* @inheritdoc
*/
public function getSupportedNodes()
{
return [self::TYPE_HEAD];
}
/**
* Add asset content type to node by name
*
* @param Layout\Element $node
* @return void
*/
protected function addContentTypeByNodeName(Layout\Element $node)
{
switch ($node->getName()) {
case self::HEAD_CSS:
$node->addAttribute('content_type', 'css');
break;
case self::HEAD_SCRIPT:
$node->addAttribute('content_type', 'js');
break;
case self::HEAD_FONT:
$node->addAttribute('content_type', 'font');
break;
}
}
/**
* Read children elements structure and fill scheduled structure
*
* @param Layout\Reader\Context $readerContext
* @param Layout\Element $headElement
* @return $this|Layout\ReaderInterface
*/
public function interpret(
Layout\Reader\Context $readerContext,
Layout\Element $headElement
) {
$pageConfigStructure = $readerContext->getPageConfigStructure();
$orderedNodes = [];
foreach ($headElement as $node) {
$nodeOrder = $node->getAttribute('order') ?: 0;
$orderedNodes[$nodeOrder][] = $node;
}
ksort($orderedNodes);
foreach ($orderedNodes as $nodes) {
/** @var \Magento\Framework\View\Layout\Element $node */
foreach ($nodes as $node) {
$this->processNode($node, $pageConfigStructure);
}
}
return $this;
}
/**
* Get all attributes for current dom element
*
* @param \Magento\Framework\View\Layout\Element $element
* @return array
*/
protected function getAttributes($element)
{
$attributes = [];
foreach ($element->attributes() as $attrName => $attrValue) {
$attributes[$attrName] = (string)$attrValue;
}
return $attributes;
}
/**
* Set metadata
*
* @param \Magento\Framework\View\Page\Config\Structure $pageConfigStructure
* @param \Magento\Framework\View\Layout\Element $node
* @return void
*/
private function setMetadata($pageConfigStructure, $node)
{
if (!$node->getAttribute('name') && $node->getAttribute('property')) {
$metadataName = $node->getAttribute('property');
} else {
$metadataName = $node->getAttribute('name');
}
$pageConfigStructure->setMetadata($metadataName, $node->getAttribute('content'));
}
/**
* Process given node based on it's name.
*
* @param Layout\Element $node
* @param Structure $pageConfigStructure
* @return void
*/
private function processNode(Layout\Element $node, Structure $pageConfigStructure)
{
switch ($node->getName()) {
case self::HEAD_CSS:
case self::HEAD_SCRIPT:
case self::HEAD_LINK:
case self::HEAD_FONT:
$this->addContentTypeByNodeName($node);
$pageConfigStructure->addAssets($node->getAttribute('src'), $this->getAttributes($node));
break;
case self::HEAD_REMOVE:
$pageConfigStructure->removeAssets($node->getAttribute('src'));
break;
case self::HEAD_TITLE:
$pageConfigStructure->setTitle(new \Magento\Framework\Phrase($node));
break;
case self::HEAD_META:
$this->setMetadata($pageConfigStructure, $node);
break;
case self::HEAD_ATTRIBUTE:
$pageConfigStructure->setElementAttribute(
PageConfig::ELEMENT_TYPE_HEAD,
$node->getAttribute('name'),
$node->getAttribute('value')
);
break;
default:
break;
}
}
}