Added label support.

If a label is available, the label and its input field are being wrapped
by a div for better structuring/styling.

module.php

@@ -1,12 +1,12 @@
 <?php
 
-use Lewp\Resolve;
+use Lewp\{Module, Resolve, VarFolder};
-use Lewp\VarFolder;
 
-return new class extends Lewp\Module
+return new class extends Module
 {
     const OPTIONS_ELEMENTS = 'elements';
     const OPTIONS_ELEMENT = 'element';
+    const OPTIONS_LABEL = 'label';
 
     // element specific
     const OPTIONS_SHOW_PLACEHOLDER = 'show_placeholder';
@@ -21,6 +21,7 @@ return new class extends Lewp\Module
         self::OPTIONS_ELEMENTS => false,
         self::OPTIONS_ELEMENT => false,
         self::OPTIONS_CONTENT => false,
+        self::OPTIONS_LABEL => false,
     ];
 
     private $element_id = 0;
@@ -44,15 +45,50 @@ return new class extends Lewp\Module
         return true;
     }
 
+    private function generateFormElementName(bool $increase_element_id): string
+    {
+        return implode(
+            '-',
+            [
+                $this->getModuleName(),
+                $this->getExecutionCount(),
+                ($increase_element_id) ? $this->element_id++ : $this->element_id,
+            ]
+        );
+    }
+
+    private function createFormElementGroup(array $element)
+    {
+        if (!isset($element[self::OPTIONS_LABEL])) {
+            return $this->createFormElement($element);
+        } else {
+            $label = $this->createLabel($element);
+        }
+
+        $wrapper = $this->createAndSetupElement(
+            'div',
+            '',
+            [
+                'class' => 'element-container'
+            ]
+        );
+        $wrapper->appendChild($label);
+
+        $form_element = $this->createFormElement($element);
+
+        $wrapper->appendChild($form_element);
+        return $wrapper;
+    }
+
     private function createFormElement(array $element)
     {
         $element += [self::OPTIONS_CONTENT => ''];
         if ($this->canContainData($element)) {
-            $element["name"] = implode('-', [
+            // if no label given, the element id should be increased
-                $this->getModuleName(),
+            $element["name"] = $this->generateFormElementName(
-                $this->getExecutionCount(),
+                true//!array_key_exists($element[self::OPTIONS_LABEL])
-                $this->element_id++,
+            );
-            ]);
+            $element["id"] = $element["name"];
         } else {
             unset($element["name"]);
         }
@@ -62,27 +98,42 @@ return new class extends Lewp\Module
             $element[self::OPTIONS_CONTENT],
             array_diff_key($element, $this->non_attribute_options)
         );
+
         foreach ($element[self::OPTIONS_ELEMENTS] as $element) {
-            $form_element->appendChild($this->createFormElement($element));
+            $form_element->appendChild($this->createFormElementGroup($element));
         }
         return $form_element;
     }
 
+    private function createLabel(array $element)
+    {
+
+        $label = $this->createAndSetupElement(
+            'label',
+            $element[self::OPTIONS_LABEL],
+            [
+                'for' => $this->generateFormElementName(false),
+            ]
+        );
+        return $label;
+    }
+
     private function setupForm(array $elements)
     {
         foreach ($elements as $element) {
-            $this->appendChild($this->createFormElement($element));
+            $this->appendChild($this->createFormElementGroup($element));
         }
     }
 
-    private function collectFormKeys() {
+    private function collectFormKeys()
+    {
         return preg_grep(
-            '/'.
+            '/' .
             $this->getModuleName()
-            .'-'
+            . '-'
-            .$this->getExecutionCount()
+            . $this->getExecutionCount()
-            .'-\d+'
+            . '-\d+'
-            .'/',
+            . '/',
             array_keys($_POST)
         );
     }
@@ -98,13 +149,13 @@ return new class extends Lewp\Module
     public function getData()
     {
         if (!$this->isSubmitted()) {
-            return null;
+            return [];
         }
         $data = [];
         $keys = $this->collectFormKeys();
         sort($keys, SORT_NUMERIC);
         foreach ($keys as $key) {
-            $data []= $_POST[$key];
+            $data [] = $_POST[$key];
         }
         return $data;
     }
@@ -112,10 +163,10 @@ return new class extends Lewp\Module
     private function processAction($action)
     {
         if ($action === '/') {
-            return '/'.$this->getLanguage();
+            return '/' . $this->getLanguage();
         }
         if (strpos($action, '/') === 0) {
-            return '/'.$this->getLanguage().$action;
+            return '/' . $this->getLanguage() . $action;
         }
         return implode('/', [
             '',