Facebook\InstantArticles\Transformer\Rules\InteractiveRule::apply PHP Method

    public function apply($transformer, $context, $node)
    {
        $interactive = Interactive::create();
        if (Type::is($context, InstantArticle::getClassName())) {
            $instant_article = $context;
        } elseif ($transformer->getInstantArticle()) {
            $instant_article = $transformer->getInstantArticle();
            $context->disableEmptyValidation();
            $context = Paragraph::create();
            $context->disableEmptyValidation();
        } else {
            $transformer->addWarning(new NoRootInstantArticleFoundWarning(null, $node));
            return $context;
        }
        // Builds the interactive
        $iframe = $this->getProperty(self::PROPERTY_IFRAME, $node);
        $url = $this->getProperty(self::PROPERTY_URL, $node);
        if ($iframe) {
            $interactive->withHTML($iframe);
        }
        if ($url) {
            $interactive->withSource($url);
        }
        if ($iframe || $url) {
            $instant_article->addChild($interactive);
            if ($instant_article !== $context) {
                $instant_article->addChild($context);
            }
        } else {
            $transformer->addWarning(new InvalidSelector(self::PROPERTY_IFRAME, $instant_article, $node, $this));
        }
        if ($this->getProperty(self::PROPERTY_WIDTH_COLUMN_WIDTH, $node)) {
            $interactive->withMargin(Interactive::COLUMN_WIDTH);
        } else {
            $interactive->withMargin(Interactive::NO_MARGIN);
        }
        $width = $this->getProperty(self::PROPERTY_WIDTH, $node);
        if ($width) {
            $interactive->withWidth($width);
        }
        $height = $this->getProperty(self::PROPERTY_HEIGHT, $node);
        if ($height) {
            $interactive->withHeight($height);
        }
        $suppress_warnings = $transformer->suppress_warnings;
        $transformer->suppress_warnings = true;
        $transformer->transform($interactive, $node);
        $transformer->suppress_warnings = $suppress_warnings;
        return $context;
    }