Add "final" to classes non-inherited

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

Author: jfcherng

src/Diff.php

@@ -16,7 +16,7 @@
  *
  * @see http://github.com/chrisboulton/php-diff
  */
-class Diff
+final class Diff
 {
     /**
      * @var array array of the options that have been applied for generating the diff
@@ -26,27 +26,27 @@ class Diff
     /**
      * @var string[] the "old" sequence to use as the basis for the comparison
      */
-    protected $a = [];
+    private $a = [];
 
     /**
      * @var string[] the "new" sequence to generate the changes for
      */
-    protected $b = [];
+    private $b = [];
 
     /**
      * @var null|SequenceMatcher the sequence matcher
      */
-    protected $sequenceMatcher;
+    private $sequenceMatcher;
 
     /**
      * @var null|array array containing the generated opcodes for the differences between the two items
      */
-    protected $groupedCodes;
+    private $groupedCodes;
 
     /**
      * @var array associative array of the default options available for the diff class and their default value
      */
-    protected static $defaultOptions = [
+    private static $defaultOptions = [
         // show how many neighbor lines
         'context' => 3,
         // ignore case difference
@@ -231,7 +231,7 @@ public function render(AbstractRenderer $renderer): string
      *
      * @return string[] array of all of the lines between the specified range
      */
-    protected function getText(array $lines, int $start = 0, ?int $end = null): array
+    private function getText(array $lines, int $start = 0, ?int $end = null): array
     {
         if ($start === 0 && (!isset($end) || $end === \count($lines))) {
             return $lines;

src/DiffHelper.php

@@ -7,7 +7,7 @@
 use Jfcherng\Diff\Renderer\RendererConstant;
 use Jfcherng\Diff\Utility\RendererFactory;
 
-class DiffHelper
+final class DiffHelper
 {
     /**
      * Get the information about available templates.

src/Exception/FileNotFoundException.php

@@ -7,7 +7,7 @@
 use Exception;
 use Throwable;
 
-class FileNotFoundException extends Exception
+final class FileNotFoundException extends Exception
 {
     public function __construct(string $filepath = '', int $code = 0, Throwable $previous = null)
     {

src/Renderer/Html/Inline.php

@@ -9,7 +9,7 @@
 /**
  * Inline HTML diff generator.
  */
-class Inline extends AbstractHtml
+final class Inline extends AbstractHtml
 {
     /**
      * {@inheritdoc}

src/Renderer/Html/Json.php

@@ -7,7 +7,7 @@
 /**
  * Json diff generator.
  */
-class Json extends AbstractHtml
+final class Json extends AbstractHtml
 {
     /**
      * {@inheritdoc}

src/Renderer/Html/LineRenderer/Char.php

@@ -8,7 +8,7 @@
 use Jfcherng\Diff\Utility\SequenceMatcher;
 use Jfcherng\Utility\MbString;
 
-class Char extends AbstractLineRenderer
+final class Char extends AbstractLineRenderer
 {
     /**
      * {@inheritdoc}

src/Renderer/Html/LineRenderer/Line.php

@@ -6,7 +6,7 @@
 
 use Jfcherng\Utility\MbString;
 
-class Line extends AbstractLineRenderer
+final class Line extends AbstractLineRenderer
 {
     /**
      * {@inheritdoc}

src/Renderer/Html/LineRenderer/None.php

@@ -6,7 +6,7 @@
 
 use Jfcherng\Utility\MbString;
 
-class None extends AbstractLineRenderer
+final class None extends AbstractLineRenderer
 {
     /**
      * {@inheritdoc}

src/Renderer/Html/LineRenderer/Word.php

@@ -8,7 +8,7 @@
 use Jfcherng\Diff\Utility\SequenceMatcher;
 use Jfcherng\Utility\MbString;
 
-class Word extends AbstractLineRenderer
+final class Word extends AbstractLineRenderer
 {
     /**
      * {@inheritdoc}

src/Renderer/Html/SideBySide.php

@@ -9,7 +9,7 @@
 /**
  * Side by Side HTML diff generator.
  */
-class SideBySide extends AbstractHtml
+final class SideBySide extends AbstractHtml
 {
     /**
      * {@inheritdoc}