Let text renderers throw exception for renderArray()

Signed-off-by: Jack Cherng <jfcherng@gmail.com>

Author: jfcherng

src/Exception/UnsupportedFunctionException.php

@@ -0,0 +1,13 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Jfcherng\Diff\Exception;
+
+final class UnsupportedFunctionException extends \Exception
+{
+    public function __construct(string $funcName = '', int $code = 0, \Throwable $previous = null)
+    {
+        parent::__construct("Unsupported function: {$funcName}", $code, $previous);
+    }
+}

src/Renderer/RendererInterface.php

@@ -5,6 +5,7 @@
 namespace Jfcherng\Diff\Renderer;
 
 use Jfcherng\Diff\Differ;
+use Jfcherng\Diff\Exception\UnsupportedFunctionException;
 
 /**
  * Renderer Interface.
@@ -22,13 +23,13 @@ public function getResultForIdenticals(): string;
      * @param Differ $differ the Differ object to be rendered
      */
     public function render(Differ $differ): string;
-    
+
     /**
      * Render the differ array and return the result.
      *
      * @param array $differArray the Differ array to be rendered
      *
-     * @return string
+     * @throws UnsupportedFunctionException if the renderer does not support this method
      */
     public function renderArray(array $differArray): string;
 }

src/Renderer/Text/AbstractText.php

@@ -4,6 +4,7 @@
 
 namespace Jfcherng\Diff\Renderer\Text;
 
+use Jfcherng\Diff\Exception\UnsupportedFunctionException;
 use Jfcherng\Diff\Renderer\AbstractRenderer;
 
 /**
@@ -23,20 +24,24 @@ public function getResultForIdenticalsDefault(): string
     {
         return '';
     }
-    
+
     /**
      * {@inheritdoc}
      */
     public function renderArrayWoker(array $differArray): string
     {
+        throw new UnsupportedFunctionException(__METHOD__);
+
         return '';
     }
-    
+
     /**
      * {@inheritdoc}
      */
     public function baseWoker(array $changes): string
     {
+        throw new UnsupportedFunctionException(__METHOD__);
+
         return '';
     }
 }