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msd2/wordpress/wp-content/plugins/amp/includes/templates/class-amp-content.php

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+<?php
+/**
+ * Class AMP_Content
+ *
+ * @package AMP
+ */
+
+/**
+ * Class AMP_Content
+ */
+class AMP_Content {
+
+	/**
+	 * Content.
+	 *
+	 * @var string
+	 */
+	private $content;
+
+	/**
+	 * AMP content.
+	 *
+	 * @var string
+	 */
+	private $amp_content = '';
+
+	/**
+	 * AMP scripts.
+	 *
+	 * @var array
+	 */
+	private $amp_scripts = array();
+
+	/**
+	 * AMP styles.
+	 *
+	 * @deprecated
+	 * @var array
+	 */
+	private $amp_styles = array();
+
+	/**
+	 * AMP stylesheets.
+	 *
+	 * @since 1.0
+	 * @var array
+	 */
+	private $amp_stylesheets = array();
+
+	/**
+	 * Args.
+	 *
+	 * @var array
+	 */
+	private $args = array();
+
+	/**
+	 * Embed handlers.
+	 *
+	 * @var AMP_Base_Embed_Handler[] AMP_Base_Embed_Handler[]
+	 */
+	private $embed_handlers = array();
+
+	/**
+	 * Sanitizer class names.
+	 *
+	 * @var string[]
+	 */
+	private $sanitizer_classes = array();
+
+	/**
+	 * AMP_Content constructor.
+	 *
+	 * @param string   $content               Content.
+	 * @param string[] $embed_handler_classes Embed handler class names.
+	 * @param string[] $sanitizer_classes     Sanitizer class names.
+	 * @param array    $args                  Args.
+	 */
+	public function __construct( $content, $embed_handler_classes, $sanitizer_classes, $args = array() ) {
+		$this->content           = $content;
+		$this->args              = $args;
+		$this->embed_handlers    = $this->register_embed_handlers( $embed_handler_classes );
+		$this->sanitizer_classes = $sanitizer_classes;
+
+		$this->sanitizer_classes['AMP_Embed_Sanitizer']['embed_handlers'] = $this->embed_handlers;
+
+		$this->transform();
+	}
+
+	/**
+	 * Get AMP content.
+	 *
+	 * @return string
+	 */
+	public function get_amp_content() {
+		return $this->amp_content;
+	}
+
+	/**
+	 * Get AMP scripts.
+	 *
+	 * @return array
+	 */
+	public function get_amp_scripts() {
+		return $this->amp_scripts;
+	}
+
+	/**
+	 * Get AMP styles.
+	 *
+	 * @deprecated Since 1.0 in favor of the get_amp_stylesheets method.
+	 * @return array Empty list.
+	 */
+	public function get_amp_styles() {
+		_deprecated_function( __METHOD__, '1.0', __CLASS__ . '::get_amp_stylesheets' );
+		return array();
+	}
+
+	/**
+	 * Get AMP styles.
+	 *
+	 * @since 1.0
+	 * @return array
+	 */
+	public function get_amp_stylesheets() {
+		return $this->amp_stylesheets;
+	}
+
+	/**
+	 * Transform.
+	 */
+	private function transform() {
+		$content = $this->content;
+
+		// First, embeds + the_content filter.
+		$content = apply_filters( 'the_content', $content );
+		$this->unregister_embed_handlers( $this->embed_handlers );
+
+		// Then, sanitize to strip and/or convert non-amp content.
+		$content = $this->sanitize( $content );
+
+		$this->amp_content = $content;
+	}
+
+	/**
+	 * Add scripts.
+	 *
+	 * @param array $scripts Scripts.
+	 */
+	private function add_scripts( $scripts ) {
+		$this->amp_scripts = array_merge( $this->amp_scripts, $scripts );
+	}
+
+	/**
+	 * Add stylesheets.
+	 *
+	 * @since 1.0
+	 * @param array $stylesheets Styles.
+	 */
+	private function add_stylesheets( $stylesheets ) {
+		$this->amp_stylesheets = array_merge( $this->amp_stylesheets, $stylesheets );
+	}
+
+	/**
+	 * Register embed handlers.
+	 *
+	 * @param string[] $embed_handler_classes Embed handler class names.
+	 * @return array
+	 */
+	private function register_embed_handlers( $embed_handler_classes ) {
+		$embed_handlers = array();
+
+		foreach ( $embed_handler_classes as $embed_handler_class => $args ) {
+			$embed_handler = new $embed_handler_class( array_merge( $this->args, $args ) );
+
+			if ( ! is_subclass_of( $embed_handler, 'AMP_Base_Embed_Handler' ) ) {
+				_doing_it_wrong(
+					__METHOD__,
+					esc_html(
+						sprintf(
+							/* translators: 1: embed handler. 2: AMP_Embed_Handler */
+							__( 'Embed Handler (%1$s) must extend `%2$s`', 'amp' ),
+							esc_html( $embed_handler_class ),
+							'AMP_Embed_Handler'
+						)
+					),
+					'0.1'
+				);
+				continue;
+			}
+
+			$embed_handler->register_embed();
+			$embed_handlers[] = $embed_handler;
+		}
+
+		return $embed_handlers;
+	}
+
+	/**
+	 * Unregister embed handlers.
+	 *
+	 * @param array $embed_handlers Embed handlers.
+	 */
+	private function unregister_embed_handlers( $embed_handlers ) {
+		foreach ( $embed_handlers as $embed_handler ) {
+			$this->add_scripts( $embed_handler->get_scripts() );
+			$embed_handler->unregister_embed();
+		}
+	}
+
+	/**
+	 * Sanitize.
+	 *
+	 * @see AMP_Content_Sanitizer::sanitize()
+	 * @param string $content Content.
+	 * @return string Sanitized content.
+	 */
+	private function sanitize( $content ) {
+		$dom = AMP_DOM_Utils::get_dom_from_content( $content );
+
+		$results = AMP_Content_Sanitizer::sanitize_document( $dom, $this->sanitizer_classes, $this->args );
+
+		$this->add_scripts( $results['scripts'] );
+		$this->add_stylesheets( $results['stylesheets'] );
+
+		return AMP_DOM_Utils::get_content_from_dom( $dom );
+	}
+}