with open('D:\\app\\ai\\app-grosir\\test_syntax2.dart', 'r') as f:
    lines = f.readlines()

depth = 0
for i, line in enumerate(lines):
    opens = line.count('(')
    closes = line.count(')')
    if opens != 0 or closes != 0 or depth != 0:
        depth += opens - closes
        print(f'{i+1}: +{opens}-{closes} = {depth} | {line.rstrip()}')