Phase 5: Content and SEO - Yoast SEO, Schema.org markup, Open Graph, favicon support, XML sitemap

wp-content/plugins/wordpress-seo/src/conditionals/feature-flag-conditional.php

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+<?php
+
+namespace Yoast\WP\SEO\Conditionals;
+
+/**
+ * Abstract class for creating conditionals based on feature flags.
+ */
+abstract class Feature_Flag_Conditional implements Conditional {
+
+	/**
+	 * Returns whether or not this conditional is met.
+	 *
+	 * @return bool Whether or not the conditional is met.
+	 */
+	public function is_met() {
+		$feature_flag = \strtoupper( $this->get_feature_flag() );
+
+		return \defined( 'YOAST_SEO_' . $feature_flag ) && \constant( 'YOAST_SEO_' . $feature_flag ) === true;
+	}
+
+	/**
+	 * Returns the name of the feature flag.
+	 * 'YOAST_SEO_' is automatically prepended to it and it will be uppercased.
+	 *
+	 * @return string the name of the feature flag.
+	 */
+	abstract protected function get_feature_flag();
+
+	/**
+	 * Returns the feature name.
+	 *
+	 * @return string the name of the feature flag.
+	 */
+	public function get_feature_name() {
+		return $this->get_feature_flag();
+	}
+}