Merge pull request #47 from JAK0TA/add-start-with-viewhelper

feat: add a view helper to check what the string starts with

Classes/ViewHelpers/Condition/String/StartWithViewHelper.php

@@ -0,0 +1,30 @@
+<?php
+
+// Copyright JAKOTA Design Group GmbH. All rights reserved.
+declare(strict_types=1);
+
+namespace JAKOTA\Typo3ToolBox\ViewHelpers\Condition\String;
+
+use TYPO3Fluid\Fluid\Core\ViewHelper\AbstractConditionViewHelper;
+
+class StartWithViewHelper extends AbstractConditionViewHelper {
+  /**
+   * Initialize arguments.
+   */
+  public function initializeArguments(): void {
+    parent::initializeArguments();
+
+    $this->registerArgument('haystack', 'string', 'The string to search in.', true);
+    $this->registerArgument('needle', 'string', 'The substring to search for in the haystack.', true);
+  }
+
+  /**
+   * @param array<string, mixed> $arguments
+   */
+  protected static function evaluateCondition($arguments = null) {
+    $haystack = strval($arguments['haystack'] ?? '');
+    $needle = strval($arguments['needle'] ?? '');
+
+    return substr($haystack, 0, strlen($needle)) === $needle;
+  }
+}