Python删除Java源文件中全部注释的实现方法

#!D:/Python32# 过滤JAVA程序中的注释# 如果字符串中有注释符号的话会有问题。import osimport reimport io# 改这个目录！！！top_dir = "E://java_comments_trim//";# 状态S_INIT       = 0;S_SLASH       = 1;S_BLOCK_COMMENT   = 2;S_BLOCK_COMMENT_DOT = 3;S_LINE_COMMENT   = 4;S_STR        = 5;S_STR_ESCAPE    = 6;def trim_dir(path): print("目录：" + path); for root, dirs, files in os.walk(path):  for name in files:   trim_file(os.path.join(root, name))  #for name in dirs:   #trim_dir(os.path.join(root, name))def trim_file(path): print("文件：" + path); if re.match(".*java{1}quot;, path):  print(" 处理"); else:  print(" 忽略");  return; bak_file = path + ".bak"; os.rename(path, bak_file); fp_src = open(bak_file); fp_dst = open(path, 'w'); state = S_INIT; for line in fp_src.readlines():  for c in line:   if state == S_INIT:    if c == '/':     state = S_SLASH;    elif c == '"''"':     state = S_STR;     fp_dst.write(c);    else:     fp_dst.write(c);   elif state == S_SLASH:    if c == '*':     state = S_BLOCK_COMMENT;    elif c == '/':     state = S_LINE_COMMENT;    else:     fp_dst.write('/');     fp_dst.write(c);   elif state == S_BLOCK_COMMENT:    if c == '*':     state = S_BLOCK_COMMENT_DOT;   elif state == S_BLOCK_COMMENT_DOT:    if c == '/':     state = S_INIT;    else:     state = S_BLOCK_COMMENT;   elif state == S_LINE_COMMENT:    if c == '/n':     state = S_INIT;   elif state == S_STR:    if c == '//':     state = S_STR_ESCAPE;    elif c == '"':     state = S_INIT;    fp_dst.write(c);   elif state == S_STR_ESCAPE:    # 这里未完全实现全部序列，如/oNNN /xHH /u1234 /U12345678，但没影响    state = S_STR;    fp_dst.write(c); fp_src.close(); fp_dst.close();trim_dir(top_dir);