API Formfield validation for nested groups and pages

code/extensions/UserFormFieldEditorExtension.php

@@ -115,7 +115,7 @@ class UserFormFieldEditorExtension extends DataExtension {
 
 		// Add step
 		$step = EditableFormStep::create();
-		$step->Title = _t('EditableFormStep.TITLE_FIRST', 'First Step');
+		$step->Title = _t('EditableFormStep.TITLE_FIRST', 'First Page');
 		$step->Sort = 1;
 		$step->write();
 		$fields->add($step);

code/extensions/UserFormValidator.php

@@ -0,0 +1,108 @@
+<?php
+
+
+class UserFormValidator extends RequiredFields {
+	public function php($data) {
+		if(!parent::php($data)) {
+			return false;
+		}
+
+		// Skip unsaved records
+		if(empty($data['ID']) || !is_numeric($data['ID'])) {
+			return true;
+		}
+
+		$fields = EditableFormField::get()->filter('ParentID', $data['ID'])->sort('"Sort" ASC');
+
+		// Current nesting
+		$stack = array();
+		foreach($fields as $field) {
+			if($field instanceof EditableFormStep) {
+				// Page at top level, or after another page is ok
+				if(empty($stack) || (count($stack) === 1 && $stack[0] instanceof EditableFormStep)) {
+					$stack = array($field);
+					continue;
+				}
+
+				$this->validationError(
+					'FormFields',
+					_t(
+						"UserFormValidator.UNEXPECTED_BREAK",
+						"Unexpected page break '{name}' inside nested field '{group}'",
+						array(
+							'name' => $field->CMSTitle,
+							'group' => end($stack)->CMSTitle
+						)
+					),
+					'error'
+				);
+				return false;
+			}
+
+			// Validate no pages
+			if(empty($stack)) {
+				$this->validationError(
+					'FormFields',
+					_t(
+						"UserFormValidator.NO_PAGE",
+						"Field '{name}' found before any pages",
+						array(
+							'name' => $field->CMSTitle
+						)
+					),
+					'error'
+				);
+				return false;
+			}
+
+			// Nest field group
+			if($field instanceof EditableFieldGroup) {
+				$stack[] = $field;
+				continue;
+			}
+
+			// Unnest field group
+			if($field instanceof EditableFieldGroupEnd) {
+				$top = end($stack);
+
+				// Check that the top is a group at all
+				if(!$top instanceof EditableFieldGroup) {
+					$this->validationError(
+						'FormFields',
+						_t(
+							"UserFormValidator.UNEXPECTED_GROUP_END",
+							"'{name}' found without a matching group",
+							array(
+								'name' => $field->CMSTitle
+							)
+						),
+						'error'
+					);
+					return false;
+				}
+
+				// Check that the top is the right group
+				if($top->EndID != $field->ID) {
+					$this->validationError(
+						'FormFields',
+						_t(
+							"UserFormValidator.WRONG_GROUP_END",
+							"'{name}' found closes the wrong group '{group}'",
+							array(
+								'name' => $field->CMSTitle,
+								'group' => $top->CMSTitle
+							)
+						),
+						'error'
+					);
+					return false;
+				}
+
+				// Unnest group
+				array_pop($stack);
+			}
+		}
+		
+		return true;
+	}
+}

code/model/UserDefinedForm.php

@@ -286,6 +286,14 @@ SQL;
 		
 		DB::alteration_message('Migrated userforms', 'changed');
 	}
+
+
+	/**
+	 * Validate formfields
+	 */
+	public function getCMSValidator() {
+		return new UserFormValidator();
+	}
 }
 
 /**

code/model/editableformfields/EditableFieldGroup.php

@@ -5,6 +5,10 @@
  */
 class EditableFieldGroup extends EditableFormField {
 
+	private static $has_one = array(
+		'End' => 'EditableFieldGroupEnd'
+	);
+
 	/**
 	 * Disable selection of group class
 	 *
@@ -19,13 +23,20 @@ class EditableFieldGroup extends EditableFormField {
 		return $fields;
 	}
 
-	public function getInlineClassnameField($column, $fieldClasses) {
-		return new LabelField(
-			$column,
-			_t('EditableFieldGroup.FIELD_GROUP_START', 'Field Group (start)')
+	public function getCMSTitle() {
+		return _t(
+			'EditableFieldGroupEnd.FIELD_GROUP_START',
+			'Start of {group}',
+			array(
+				'group' => $this->Title ?: 'group'
+			)
 		);
 	}
 
+	public function getInlineClassnameField($column, $fieldClasses) {
+		return new LabelField($column, $this->CMSTitle);
+	}
+
 	public function showInReports() {
 		return false;
 	}
@@ -49,5 +60,21 @@ class EditableFieldGroup extends EditableFormField {
 			$field->addExtraClass($field->ExtraClass);
 		}
 	}
+
+	protected function onBeforeDelete() {
+		parent::onBeforeDelete();
+
+		// Ensures EndID is lazy-loaded for onAfterDelete
+		$this->EndID;
+	}
+
+	protected function onAfterDelete() {
+		parent::onAfterDelete();
+
+		// Delete end
+		if(($end = $this->End()) && $end->exists()) {
+			$end->delete();
+		}
+	}
 	
 }

code/model/editableformfields/EditableFieldGroupEnd.php

@@ -5,6 +5,10 @@
  */
 class EditableFieldGroupEnd extends EditableFormField {
 
+	private static $belongs_to = array(
+		'Group' => 'EditableFieldGroup'
+	);
+
 	/**
 	 * Disable selection of group class
 	 *
@@ -13,6 +17,17 @@ class EditableFieldGroupEnd extends EditableFormField {
 	 */
 	private static $hidden = true;
 
+	public function getCMSTitle() {
+		$group = $this->Group();
+		return _t(
+			'EditableFieldGroupEnd.FIELD_GROUP_END',
+			'End of {group}',
+			array(
+				'group' => ($group && $group->exists() && $group->Title) ? $group->Title : 'group'
+			)
+		);
+	}
+
 	public function getCMSFields() {
 		$fields = parent::getCMSFields();
 		$fields->removeByName(array('MergeField', 'Default', 'Validation', 'DisplayRules'));
@@ -20,10 +35,7 @@ class EditableFieldGroupEnd extends EditableFormField {
 	}
 
 	public function getInlineClassnameField($column, $fieldClasses) {
-		return new LabelField(
-			$column,
-			_t('EditableFieldGroupEnd.FIELD_GROUP_END', 'Field Group (end)')
-		);
+		return new LabelField($column, $this->CMSTitle);
 	}
 
 	public function getInlineTitleField($column) {
@@ -38,8 +50,37 @@ class EditableFieldGroupEnd extends EditableFormField {
 		return false;
 	}
 
-	public function canEdit($member = null) {
-		return false;
+	public function onAfterWrite() {
+		parent::onAfterWrite();
+
+		// If this is not attached to a group, find the first group prior to this
+		// with no end attached
+		$group = $this->Group();
+		if(!($group && $group->exists()) && $this->ParentID) {
+			$group = EditableFieldGroup::get()
+				->filter(array(
+					'ParentID' => $this->ParentID,
+					'Sort:LessThanOrEqual' => $this->Sort
+				))
+				->where('"EditableFieldGroup"."EndID" IS NULL OR "EditableFieldGroup"."EndID" = 0')
+				->sort('"Sort" DESC')
+				->first();
+			
+			// When a group is found, attach it to this end
+			if($group) {
+				$group->EndID = $this->ID;
+				$group->write();
+			}
+		}
+	}
+
+	protected function onAfterDelete() {
+		parent::onAfterDelete();
+
+		// Delete group
+		if(($group = $this->Group()) && $group->exists()) {
+			$group->delete();
+		}
 	}
 	
 }

code/model/editableformfields/EditableFormField.php

@@ -450,6 +450,10 @@ class EditableFormField extends DataObject {
 		return Convert::raw2xml($this->Title);
 	}
 
+	public function getCMSTitle() {
+		return $this->i18n_singular_name() . ' (' . $this->Title . ')';
+	}
+
 	/**
 	 * @deprecated since version 4.0
 	 */

code/model/editableformfields/EditableFormStep.php

@@ -6,6 +6,10 @@
  */
 class EditableFormStep extends EditableFormField {
 
+	private static $singular_name = 'Page Break';
+
+	private static $plural_name = 'Page Breaks';
+
 	/**
 	 * Disable selection of step class
 	 *
@@ -14,18 +18,6 @@ class EditableFormStep extends EditableFormField {
 	 */
 	private static $hidden = true;
 
-	/**
-	 * @config
-	 * @var string
-	 */
-	private static $singular_name = 'Step';
-
-	/**
-	 * @config
-	 * @var string
-	 */
-	private static $plural_name = 'Steps';
-
 	/**
 	 * @return FieldList
 	 */
@@ -64,7 +56,15 @@ class EditableFormStep extends EditableFormField {
 	public function getInlineClassnameField($column, $fieldClasses) {
 		return new LabelField(
 			$column,
-			_t('EditableFieldGroupEnd.PAGE_BREAK', 'Page Break')
+			$this->CMSTitle
 		);
 	}
+
+	public function getCMSTitle() {
+		$title = $this->i18n_singular_name();
+		if($this->Title) {
+			$title .= ' (' . $this->Title . ')';
+		}
+		return $title;
+	}
 }