Add Icinga\Web\Form\ErrorLabeller

refs #8415

library/Icinga/Web/Form.php

@@ -12,6 +12,7 @@ use Icinga\Application\Icinga;
 use Icinga\Authentication\Manager;
 use Icinga\Security\SecurityException;
 use Icinga\Util\Translator;
+use Icinga\Web\Form\ErrorLabeller;
 use Icinga\Web\Form\Decorator\NoScriptApply;
 use Icinga\Web\Form\Element\CsrfCounterMeasure;
 
@@ -520,6 +521,7 @@ class Form extends Zend_Form
         }
 
         $el = parent::createElement($type, $name, $options);
+        $el->setTranslator(new ErrorLabeller(array('element' => $el)));
 
         $el->addPrefixPaths(array(
             array(

library/Icinga/Web/Form/ErrorLabeller.php

@@ -0,0 +1,65 @@
+<?php
+/* Icinga Web 2 | (c) 2013-2015 Icinga Development Team | GPLv2+ */
+
+namespace Icinga\Web\Form;
+
+use BadMethodCallException;
+use Zend_Translate_Adapter;
+use Zend_Validate_NotEmpty;
+use Icinga\Web\Form\Validator\DateTimeValidator;
+use Icinga\Web\Form\Validator\ReadablePathValidator;
+use Icinga\Web\Form\Validator\WritablePathValidator;
+
+class ErrorLabeller extends Zend_Translate_Adapter
+{
+    protected $messages;
+
+    public function __construct($options = array())
+    {
+        if (! isset($options['element'])) {
+            throw new BadMethodCallException('Option "element" is missing');
+        }
+
+        $this->messages = $this->createMessages($options['element']);
+    }
+
+    public function isTranslated($messageId, $original = false, $locale = null)
+    {
+        return array_key_exists($messageId, $this->messages);
+    }
+
+    public function translate($messageId, $locale = null)
+    {
+        if (array_key_exists($messageId, $this->messages)) {
+            return $this->messages[$messageId];
+        }
+
+        return $messageId;
+    }
+
+    protected function createMessages($element)
+    {
+        $label = $element->getLabel();
+
+        return array(
+            Zend_Validate_NotEmpty::IS_EMPTY    => sprintf(t('%s is required and must not be empty'), $label),
+            WritablePathValidator::NOT_WRITABLE     => sprintf(t('%s is not writable', 'config.path'), $label),
+            WritablePathValidator::DOES_NOT_EXIST   => sprintf(t('%s does not exist', 'config.path'), $label),
+            ReadablePathValidator::NOT_READABLE     => sprintf(t('%s is not readable', 'config.path'), $label),
+            DateTimeValidator::INVALID_DATETIME_FORMAT  => sprintf(
+                t('%s not in the expected format: %%value%%'),
+                $label
+            )
+        );
+    }
+
+    protected function _loadTranslationData($data, $locale, array $options = array())
+    {
+        // nonsense, required as being abstract otherwise...
+    }
+
+    public function toString()
+    {
+        return 'ErrorLabeller'; // nonsense, required as being abstract otherwise...
+    }
+}