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

code from pantheon

* code from pantheon

wp/wp-content/plugins/contact-form-7/includes/swv/schema-holder.php

@@ -0,0 +1,57 @@
+<?php
+
+trait WPCF7_SWV_SchemaHolder {
+
+	protected $schema;
+
+
+	/**
+	 * Retrieves SWV schema for this holder object (contact form).
+	 *
+	 * @return WPCF7_SWV_Schema The schema object.
+	 */
+	public function get_schema() {
+		if ( isset( $this->schema ) ) {
+			return $this->schema;
+		}
+
+		$schema = new WPCF7_SWV_Schema( array(
+			'locale' => isset( $this->locale ) ? $this->locale : '',
+		) );
+
+		do_action( 'wpcf7_swv_create_schema', $schema, $this );
+
+		return $this->schema = $schema;
+	}
+
+
+	/**
+	 * Validates form inputs based on the schema and given context.
+	 */
+	public function validate_schema( $context, WPCF7_Validation $validity ) {
+		$callback = static function ( $rule ) use ( &$callback, $context, $validity ) {
+			if ( ! $rule->matches( $context ) ) {
+				return;
+			}
+
+			if ( $rule instanceof WPCF7_SWV_CompositeRule ) {
+				foreach ( $rule->rules() as $child_rule ) {
+					call_user_func( $callback, $child_rule );
+				}
+			} else {
+				$field = $rule->get_property( 'field' );
+
+				if ( $validity->is_valid( $field ) ) {
+					$result = $rule->validate( $context );
+
+					if ( is_wp_error( $result ) ) {
+						$validity->invalidate( $field, $result );
+					}
+				}
+			}
+		};
+
+		call_user_func( $callback, $this->get_schema() );
+	}
+
+}