Created error model and view

src/index.php

@@ -10,10 +10,8 @@ try {
     // create renderer model
     $model = new RendererModel("templates/main.php", $_REQUEST);
 } catch (InvalidArgumentException $error) {
-    // display error svg
-    $message = $error->getMessage();
-    require_once "templates/error.php";
-    exit;
+    // create error rendering model
+    $model = new RendererModel("templates/error.php", $error->getMessage());
 }
 
 // create renderer view

src/models/ErrorModel.php

@@ -0,0 +1,22 @@
+<?php declare (strict_types = 1);
+
+/**
+ * Model for error messages
+ */
+class ErrorModel
+{
+    /** @var string $message text to display */
+    public $message;
+
+    /**
+     * Construct ErrorModel
+     *
+     * @param string $message text to display
+     * @param string $template path to the template file
+     */
+    public function __construct($template, $message)
+    {
+        $this->message = $message;
+        $this->template = $template;
+    }
+}

src/views/ErrorView.php

@@ -0,0 +1,38 @@
+<?php declare (strict_types = 1);
+
+/**
+ * View for rendering error messages
+ */
+class ErrorView
+{
+    /**
+     * @var ErrorModel $model
+     */
+    private $model;
+
+    /**
+     * Constructor for Error View
+     * @param ErrorModel $model
+     */
+    public function __construct($model)
+    {
+        $this->model = $model;
+    }
+
+    /**
+     * Render SVG Output
+     * @return string
+     */
+    public function output()
+    {
+        // import variables into symbol table
+        extract(["message" => $this->model->lines]);
+        // render SVG with output buffering
+        ob_start();
+        require_once $this->model->template;
+        $output = ob_get_contents();
+        ob_end_clean();
+        // return rendered output
+        return $output;
+    }
+}