Implement lexer class for tokenization and replace all line endings by PHP_EOL

src/Service/SnipContent/Lexer.php

@@ -4,5 +4,13 @@ namespace App\Service\SnipContent;
 
 class Lexer
 {
+    public static function tokenize(string $text): array {
+        $text = str_replace("\r", '', $text);
+        return explode(PHP_EOL, $text);
+    }
 
+    public static function reconstruct(array $tokens): string
+    {
+        return implode(PHP_EOL, $tokens);
+    }
 }

src/Service/SnipContent/MyersDiff.php

@@ -4,8 +4,6 @@ namespace App\Service\SnipContent;
 
 class MyersDiff
 {
-    private const string NEWLINE = "\r\n";
-
     /**
      * Backtrack through the intermediate results to extract the "snakes" that
      * are visited on the chosen "D-path".
@@ -97,20 +95,18 @@ class MyersDiff
     public static function calculate(string|array $textFrom, string|array $textTo, ?callable $compare = null): array
     {
         if (is_string($textFrom)) {
-            $a = self::explode($textFrom);
+            $a = Lexer::tokenize($textFrom);
         } else {
             $a = $textFrom;
         }
         if (is_string($textTo)) {
-            $b = self::explode($textTo);
+            $b = Lexer::tokenize($textTo);
         } else {
             $b = $textTo;
         }
 
         if ($compare === null) {
-            $compare = function ($x, $y) {
-                return $x === $y;
-            };
+            $compare = fn($x, $y) => $x === $y;
         }
 
         $n = count($a);
@@ -147,7 +143,7 @@ class MyersDiff
 
     public static function rebuildBFromCompact(string $textFrom, array $diff): string
     {
-        $a = self::explode($textFrom);
+        $a = Lexer::tokenize($textFrom);
         $b = [];
         $x = 0;
 
@@ -171,13 +167,13 @@ class MyersDiff
             }
         }
 
-        return self::implode($b);
+        return Lexer::reconstruct($b);
     }
 
     public static function buildDiffLines(string $textFrom, string $textTo): array
     {
-        $a = self::explode($textFrom);
-        $b = self::explode($textTo);
+        $a = Lexer::tokenize($textFrom);
+        $b = Lexer::tokenize($textTo);
         $diff = MyersDiff::calculate($a, $b);
 
         $lines = [];
@@ -223,14 +219,4 @@ class MyersDiff
 
         return $lines;
     }
-
-    private static function explode(string $text): array
-    {
-        return explode(self::NEWLINE, $text);
-    }
-
-    private static function implode(array $text): string
-    {
-        return implode(self::NEWLINE, $text);
-    }
 }