with open(r'd:\20_AI\LSPi\libs\thirdparty\rt-thread\include\rtdef.h', 'r') as f:
    lines = f.readlines()

stack = []
for i, line in enumerate(lines, 1):
    stripped = line.strip()
    if stripped.startswith('#if ') or stripped.startswith('#ifdef ') or stripped.startswith('#ifndef '):
        stack.append((i, stripped))
        print(f'  + Line {i}: {stripped}  (depth={len(stack)})')
    elif stripped.startswith('#elif') or stripped.startswith('#else'):
        if stack:
            print(f'  ~ Line {i}: {stripped} (replaces line {stack[-1][0]}: {stack[-1][1]})')
        else:
            print(f'  ! Line {i}: {stripped} (no matching #if!)')
    elif stripped.startswith('#endif'):
        if not stack:
            print(f'  ! Line {i}: EXTRA #endif (no matching #if)')
        else:
            start_line, start_directive = stack.pop()
            print(f'  - Line {i}: #endif closes line {start_line}: {start_directive}  (depth={len(stack)})')

if stack:
    print(f'\nERROR: {len(stack)} unmatched #if/#ifdef/#ifndef:')
    for line_no, directive in stack:
        print(f'  Line {line_no}: {directive}')
else:
    print('\nAll #if directives are properly closed.')