Merged in feature/from-pantheon (pull request #16)

code from pantheon

* code from pantheon

wp/wp-content/plugins/wordpress-seo/src/helpers/schema/replace-vars-helper.php

@@ -0,0 +1,133 @@
+<?php
+
+namespace Yoast\WP\SEO\Helpers\Schema;
+
+use Closure;
+use WPSEO_Replace_Vars;
+use Yoast\WP\SEO\Conditionals\No_Conditionals;
+use Yoast\WP\SEO\Config\Schema_IDs;
+use Yoast\WP\SEO\Context\Meta_Tags_Context;
+use Yoast\WP\SEO\Helpers\Date_Helper;
+use Yoast\WP\SEO\Presentations\Indexable_Presentation;
+
+/**
+ * Registers the Schema replace variables and exposes a method to replace variables on a Schema graph.
+ */
+class Replace_Vars_Helper {
+
+	use No_Conditionals;
+
+	/**
+	 * The replace vars.
+	 *
+	 * @var WPSEO_Replace_Vars
+	 */
+	protected $replace_vars;
+
+	/**
+	 * The Schema ID helper.
+	 *
+	 * @var ID_Helper
+	 */
+	protected $id_helper;
+
+	/**
+	 * The date helper.
+	 *
+	 * @var Date_Helper
+	 */
+	protected $date_helper;
+
+	/**
+	 * Replace_Vars_Helper constructor.
+	 *
+	 * @param WPSEO_Replace_Vars $replace_vars The replace vars.
+	 * @param ID_Helper          $id_helper    The Schema ID helper.
+	 * @param Date_Helper        $date_helper  The date helper.
+	 */
+	public function __construct(
+		WPSEO_Replace_Vars $replace_vars,
+		ID_Helper $id_helper,
+		Date_Helper $date_helper
+	) {
+		$this->replace_vars = $replace_vars;
+		$this->id_helper    = $id_helper;
+		$this->date_helper  = $date_helper;
+	}
+
+	/**
+	 * Replaces the variables.
+	 *
+	 * @param array                  $schema_data  The Schema data.
+	 * @param Indexable_Presentation $presentation The indexable presentation.
+	 *
+	 * @return array The array with replaced vars.
+	 */
+	public function replace( array $schema_data, Indexable_Presentation $presentation ) {
+		foreach ( $schema_data as $key => $value ) {
+			if ( \is_array( $value ) ) {
+				$schema_data[ $key ] = $this->replace( $value, $presentation );
+
+				continue;
+			}
+
+			$schema_data[ $key ] = $this->replace_vars->replace( $value, $presentation->source );
+		}
+
+		return $schema_data;
+	}
+
+	/**
+	 * Registers the Schema-related replace vars.
+	 *
+	 * @param Meta_Tags_Context $context The meta tags context.
+	 *
+	 * @return void
+	 */
+	public function register_replace_vars( $context ) {
+		$replace_vars = [
+			'main_schema_id'   => $context->main_schema_id,
+			'author_id'        => $this->id_helper->get_user_schema_id( $context->indexable->author_id, $context ),
+			'person_id'        => $context->site_url . Schema_IDs::PERSON_HASH,
+			'primary_image_id' => $context->canonical . Schema_IDs::PRIMARY_IMAGE_HASH,
+			'webpage_id'       => $context->main_schema_id,
+			'website_id'       => $context->site_url . Schema_IDs::WEBSITE_HASH,
+			'organization_id'  => $context->site_url . Schema_IDs::ORGANIZATION_HASH,
+		];
+
+		if ( $context->post ) {
+			// Post does not always exist, e.g. on term pages.
+			$replace_vars['post_date'] = $this->date_helper->format( $context->post->post_date, \DATE_ATOM );
+		}
+
+		foreach ( $replace_vars as $var => $value ) {
+			$this->register_replacement( $var, $value );
+		}
+	}
+
+	/**
+	 * Registers a replace var and its value.
+	 *
+	 * @param string $variable The replace variable.
+	 * @param string $value    The value that the variable should be replaced with.
+	 */
+	protected function register_replacement( $variable, $value ) {
+		$this->replace_vars->safe_register_replacement(
+			$variable,
+			$this->get_identity_function( $value )
+		);
+	}
+
+	/**
+	 * Returns an anonymous function that in turn just returns the given value.
+	 *
+	 * @param mixed $value The value that the function should return.
+	 *
+	 * @return Closure A function that returns the given value.
+	 */
+	protected function get_identity_function( $value ) {
+		return static function() use ( $value ) {
+			return $value;
+		};
+	}
+}