feat(parse): implement # and ## operator handling in macro expansion

- Add support for # (stringify) and ## (concatenation) operators in macro replacement lists
- Implement scc_pp_expand_string_unsafe() to process operator tokens during macro expansion
- Add helper macros to identify blank, stringify, and concatenation tokens in replacement lists
- Include missing headers (ctype.h, string.h) for character handling functions
- Update object macro expansion to use new string expansion function instead of simple concatenation
- Improve whitespace handling in macro replacement parsing to prevent interference with operator processing

tools/wc.py

@@ -0,0 +1,53 @@
+"""统计目录下C/C++文件的行数(write by AI)"""
+
+import os
+
+
+def count_lines(file_path):
+    """统计单个文件的代码行数"""
+    try:
+        with open(file_path, "rb") as f:  # 二进制模式读取避免编码问题
+            return sum(1 for _ in f)
+    except UnicodeDecodeError:
+        print(f"警告：无法解码文件 {file_path}（可能不是文本文件）")
+        return 0
+    except Exception as e:
+        print(f"读取 {file_path} 出错: {str(e)}")
+        return 0
+
+
+def scan_files(directory, exclude_dirs=None):
+    """扫描目录获取所有C/C++文件"""
+    if exclude_dirs is None:
+        exclude_dirs = [".git", "venv", "__pycache__", ".old"]  # 默认排除的目录
+
+    c_files = []
+    for root, dirs, files in os.walk(directory):
+        # 跳过排除目录
+        dirs[:] = [d for d in dirs if d not in exclude_dirs]
+
+        for file in files:
+            if file.endswith((".c", ".h")):
+                full_path = os.path.join(root, file)
+                c_files.append(full_path)
+    return c_files
+
+
+def main():
+    """main function"""
+    target_dir = input("请输入要扫描的目录路径（留空为当前目录）: ") or "."
+
+    files = scan_files(target_dir)
+    total_lines = 0
+
+    print("\n统计结果：")
+    for idx, file in enumerate(files, 1):
+        lines = count_lines(file)
+        total_lines += lines
+        print(f"{idx:4d}. {file} ({lines} 行)")
+
+    print(f"\n总计: {len(files)} 个C/C++文件，共 {total_lines} 行代码")
+
+
+if __name__ == "__main__":
+    main()