+<?php
+
+use MediaWiki\Widget\NamespacesMultiselectWidget;
+
+/**
+ * Implements a tag multiselect input field for namespaces.
+ *
+ * The result is the array of namespaces
+ *
+ * TODO: This widget duplicates a lot from HTMLTitlesMultiselectField,
+ * which itself duplicates HTMLUsersMultiselectField. These classes
+ * should be refactored.
+ *
+ * @note This widget is not likely to remain functional in non-OOUI forms.
+ */
+class HTMLNamespacesMultiselectField extends HTMLSelectNamespace {
+ public function loadDataFromRequest( $request ) {
+ $value = $request->getText( $this->mName, $this->getDefault() );
+
+ $namespaces = explode( "\n", $value );
+ // Remove empty lines
+ $namespaces = array_values( array_filter( $namespaces, function ( $namespace ) {
+ return trim( $namespace ) !== '';
+ } ) );
+ // This function is expected to return a string
+ return implode( "\n", $namespaces );
+ }
+
+ public function validate( $value, $alldata ) {
+ if ( !$this->mParams['exists'] ) {
+ return true;
+ }
+
+ if ( is_null( $value ) ) {
+ return false;
+ }
+
+ // $value is a string, because HTMLForm fields store their values as strings
+ $namespaces = explode( "\n", $value );
+
+ if ( isset( $this->mParams['max'] ) ) {
+ if ( count( $namespaces ) > $this->mParams['max'] ) {
+ return $this->msg( 'htmlform-int-toohigh', $this->mParams['max'] );
+ }
+ }
+
+ foreach ( $namespaces as $namespace ) {
+ $result = parent::validate( $namespace, $alldata );
+ if ( $result !== true ) {
+ return $result;
+ }
+ }
+
+ return true;
+ }
+
+ public function getInputHTML( $value ) {
+ $this->mParent->getOutput()->enableOOUI();
+ return $this->getInputOOUI( $value );
+ }
+
+ public function getInputOOUI( $value ) {
+ $params = [
+ 'id' => $this->mID,
+ 'name' => $this->mName,
+ 'dir' => $this->mDir,
+ ];
+
+ if ( isset( $this->mParams['disabled'] ) ) {
+ $params['disabled'] = $this->mParams['disabled'];
+ }
+
+ if ( isset( $this->mParams['default'] ) ) {
+ $params['default'] = $this->mParams['default'];
+ }
+
+ if ( isset( $this->mParams['placeholder'] ) ) {
+ $params['placeholder'] = $this->mParams['placeholder'];
+ } else {
+ $params['placeholder'] = $this->msg( 'mw-widgets-titlesmultiselect-placeholder' )->plain();
+ }
+
+ if ( isset( $this->mParams['max'] ) ) {
+ $params['tagLimit'] = $this->mParams['max'];
+ }
+
+ if ( isset( $this->mParams['input'] ) ) {
+ $params['input'] = $this->mParams['input'];
+ }
+
+ if ( !is_null( $value ) ) {
+ // $value is a string, but the widget expects an array
+ $params['default'] = $value === '' ? [] : explode( "\n", $value );
+ }
+
+ // Make the field auto-infusable when it's used inside a legacy HTMLForm rather than OOUIHTMLForm
+ $params['infusable'] = true;
+ $params['classes'] = [ 'mw-htmlform-field-autoinfuse' ];
+ $widget = new NamespacesMultiselectWidget( $params );
+ $widget->setAttributes( [ 'data-mw-modules' => implode( ',', $this->getOOUIModules() ) ] );
+
+ return $widget;
+ }
+
+ protected function shouldInfuseOOUI() {
+ return true;
+ }
+
+ protected function getOOUIModules() {
+ return [ 'mediawiki.widgets.NamespacesMultiselectWidget' ];
+ }
+
+}