initial commit

packages/woocommerce-admin/src/RemoteInboxNotifications/NotRuleProcessor.php

@@ -0,0 +1,56 @@
+<?php
+/**
+ * Rule processor that negates the rules in the rule's operand.
+ */
+
+namespace Automattic\WooCommerce\Admin\RemoteInboxNotifications;
+
+defined( 'ABSPATH' ) || exit;
+
+/**
+ * Rule processor that negates the rules in the rule's operand.
+ */
+class NotRuleProcessor implements RuleProcessorInterface {
+	/**
+	 * Constructor.
+	 *
+	 * @param RuleEvaluator $rule_evaluator The rule evaluator to use.
+	 */
+	public function __construct( $rule_evaluator = null ) {
+		$this->rule_evaluator = null === $rule_evaluator
+			? new RuleEvaluator()
+			: $rule_evaluator;
+	}
+
+	/**
+	 * Evaluates the rules in the operand and negates the result.
+	 *
+	 * @param object $rule         The specific rule being processed by this rule processor.
+	 * @param object $stored_state Stored state.
+	 *
+	 * @return bool The result of the operation.
+	 */
+	public function process( $rule, $stored_state ) {
+		$evaluated_operand = $this->rule_evaluator->evaluate(
+			$rule->operand,
+			$stored_state
+		);
+
+		return ! $evaluated_operand;
+	}
+
+	/**
+	 * Validates the rule.
+	 *
+	 * @param object $rule The rule to validate.
+	 *
+	 * @return bool Pass/fail.
+	 */
+	public function validate( $rule ) {
+		if ( ! isset( $rule->operand ) ) {
+			return false;
+		}
+
+		return true;
+	}
+}