Refactor PullRequestCodeScanner for Improved Comment Reporting (#608)

* Update PullRequestCodeScanner.php

* style: format code with PHP CS Fixer

This commit fixes the style issues introduced in a97001c according to the output
from PHP CS Fixer.

Details: #608

* Update PullRequestCodeScanner.php

* Update PullRequestCodeScanner.php

---------

Co-authored-by: deepsource-autofix[bot] <62050782+deepsource-autofix[bot]@users.noreply.github.com>

Src/Library/PullRequestCodeScanner.php

@@ -4,38 +4,48 @@
 
 class PullRequestCodeScanner
 {
-    public function scanDiffForKeywords($diff): array
+    public function scanDiffForKeywords($diffContent): array
     {
-        $keywords = ['bug', 'todo', 'fixme'];
-        $linesWithKeywords = [];
-        $diffLines = explode("\n", $diff);
-
-        foreach ($diffLines as $line) {
-            if (strpos($line, '+') === 0) {
-                $cleanedLine = trim(substr($line, 1));
-                if (preg_match('/(\/\/|#|\/\*)/i', $cleanedLine)) {
-                    foreach ($keywords as $keyword) {
-                        if (stripos($cleanedLine, $keyword) !== false) {
-                            $linesWithKeywords[] = $cleanedLine;
-                            break;
-                        }
+        $lines = explode(PHP_EOL, $diffContent);
+        $files = [];
+        $currentFile = null;
+
+        $commentPatterns = [
+            '/\bbug\b/i',
+            '/\bfixme\b/i',
+            '/\btodo\b/i',
+        ];
+
+        foreach ($lines as $line) {
+            if (preg_match('/^\+\+\+ b\/(.+)/', $line, $matches)) {
+                $currentFile = $matches[1];
+            }
+
+            if ($currentFile && preg_match('/^\+(.*)/', $line, $matches)) {
+                $codeLine = $matches[1];
+                foreach ($commentPatterns as $pattern) {
+                    if (preg_match($pattern, $codeLine)) {
+                        $files[$currentFile][] = trim($codeLine);
+                        break;
                     }
                 }
             }
         }
 
-        return $linesWithKeywords;
+        return $files;
     }
 
-    public function generateReport(array $foundComments): string
+    public function generateReport(array $files): string
     {
-        if (empty($foundComments)) {
+        if (empty($files)) {
             return "No 'bug', 'todo', or 'fixme' comments found in the pull request.";
         }
 
         $report = "Found the following comments with 'bug', 'todo', or 'fixme':\n";
-        foreach ($foundComments as $comment) {
-            $report .= "- $comment\n";
+        foreach ($files as $file => $lines) {
+            foreach ($lines as $line) {
+                $report .= "- {$line} ({$file})\n";
+            }
         }
 
         return $report;