Merge pull request #5 from yamadashy/feature/fallback-highlighter

feat: Add FallbackHighlighter for improved robustness

src/CodeHighlighter.php

@@ -9,7 +9,7 @@
 
 class CodeHighlighter
 {
-    /** @var Highlighter|OldHighlighter */
+    /** @var FallbackHighlighter|Highlighter|OldHighlighter */
     private $highlighter;
 
     public function __construct()
@@ -28,6 +28,9 @@ class_exists('\JakubOnderka\PhpConsoleHighlighter\Highlighter')
             // Support Highlighter and ConsoleColor < 1.0.
             $colors = new OldConsoleColor();
             $this->highlighter = new OldHighlighter($colors);
+        } else {
+            // Fallback to non-highlighted output
+            $this->highlighter = new FallbackHighlighter();
         }
     }
 

src/FallbackHighlighter.php

@@ -0,0 +1,31 @@
+<?php declare(strict_types=1);
+
+namespace Yamadashy\PhpStanFriendlyFormatter;
+
+use PHP_Parallel_Lint\PhpConsoleHighlighter\Highlighter;
+
+/**
+ * @see Highlighter
+ */
+class FallbackHighlighter
+{
+    public function getCodeSnippet(string $fileContent, int $lineNumber, int $lineBefore, int $lineAfter): string
+    {
+        $lines = explode("\n", $fileContent);
+        $totalLines = \count($lines);
+
+        $startLine = max(1, $lineNumber - $lineBefore);
+        $endLine = min($totalLines, $lineNumber + $lineAfter);
+
+        $snippet = '';
+        $lineNumberWidth = \strlen((string) $endLine);
+
+        for ($i = $startLine; $i <= $endLine; ++$i) {
+            $currentLine = $lines[$i - 1] ?? '';
+            $linePrefix = '<fg=gray>'.str_pad((string) $i, $lineNumberWidth, ' ', STR_PAD_LEFT).'| </>';
+            $snippet .= ($lineNumber === $i ? '<fg=red>  > </>' : '    ').$linePrefix.$currentLine."\n";
+        }
+
+        return rtrim($snippet);
+    }
+}