refactor: extract command line splitting to separate method

merge_srt.py

@@ -50,44 +50,42 @@ class SRTMerger:
             errors.append(f"Error reading {filename}: {e}")
             return commands, errors
         for line_number, line in enumerate(lines, start=1):
-            line = line.strip()
-            if not line:
-                continue
-            if line.startswith('#'):
-                continue
-            parts = shlex.split(line)
-            command_parts = []
-            for part in parts:
-                if part.startswith('#'):
-                    break
-                command_parts.append(part)
-            if not command_parts:
-                continue
-            command = command_parts[0].upper()
+            parts = SRTMerger.split_line(line)
+            command = parts[0].upper()
             if command not in ['COPY', 'MAP', 'SYNC', 'PUT']:
                 errors.append(f"Line {line_number}: unknown command '{command}'.")
                 continue
             parsed = None
             if command == 'COPY':
-                parsed = self.parse_copy(command_parts)
+                parsed = self.parse_copy(parts)
                 if parsed is None:
                     errors.append(f"Line {line_number}: invalid COPY command.")
             elif command == 'MAP':
-                parsed = self.parse_map(command_parts)
+                parsed = self.parse_map(parts)
                 if parsed is None:
                     errors.append(f"Line {line_number}: invalid MAP command.")
             elif command == 'SYNC':
-                parsed = self.parse_sync(command_parts)
+                parsed = self.parse_sync(parts)
                 if parsed is None:
                     errors.append(f"Line {line_number}: invalid SYNC command.")
             elif command == 'PUT':
-                parsed = self.parse_put(command_parts)
+                parsed = self.parse_put(parts)
                 if parsed is None:
                     errors.append(f"Line {line_number}: invalid PUT command.")
             if parsed is not None:
                 commands.append(parsed)
         return commands, errors
 
+    @staticmethod
+    def split_line(line):
+        line = line.strip()
+        parts = []
+        for part in shlex.split(line):
+            if part.startswith('#'):
+                break
+            parts.append(part)
+        return parts
+
     def parse_copy(self, parts):
         if len(parts) != 3:
             return None