说明
使用Python的字符串处理和正则表达式处理实现了一个删除C/C++源程序中所有注释和空行的小脚本。
使用字符串处理
1: # delete all the comments and empty line of a C/C++ source file
2: import os, sys,string
3:
4: #-------------------------------------------------------------
5: def usage():
6: print u'''
7: help: del_comment.py <filename | dirname>
8: '''
9: #--------------------------------------------------------------
10: def deal_file(src):
11: # file exist or not
12: if not os.path.exists(src):
13: print 'Error: file - %s doesn\'t exist.'% src
14: return False
15: if os.path.islink(src):
16: print 'Error: file - %s is a link.'
17: return False
18: filetype = (os.path.splitext(src))[1]
19: if not filetype in ['.c','.h','.cpp','.hh','.cc']:
20: return False
21: try:
22: if not os.access(src, os.W_OK):
23: os.chmod(src, 0664)
24: except:
25: print 'Error: you can not chang %s\'s mode.'% src
26:
27: inputf = open(src, 'r')
28: outputfilename = (os.path.splitext(src))[0] + '_no_comment'+filetype
29: outputf = open(outputfilename, 'w')
30:
31: try:
32: #-----find /*.....*/
33: rFlag=0
34: line=inputf.readline()
35: while(line):
36: fm=string.find(line,'/*')
37: if fm!=-1: # find a /*
38: if fm>1:# not empty line
39: outputf.write(line[:fm]+'\n')
40: rFlag=1
41: # find */
42: fm=string.find(line,'*/')
43: if fm!=-1:
44: rFlag=0
45: else:
46: line=inputf.readline()
47: while line:
48: fm=string.find(line,'*/')
49: if fm!=-1:
50: rFlag=0
51: break
52: line=inputf.readline()
53: if not line:
54: print 'Match /*...*/ error'
55: else: # deal with //
56: fm=string.find(line,'//')
57: if fm==-1:
58: if len(line)>1: # not empty line
59: outputf.write(line)
60: elif fm!=-1 and (not rFlag):
61: if fm>1: # not empty line
62: outputf.write(line[:fm]+'\n')
63: #read nextline
64: line=inputf.readline()
65: except:
66: print 'Error: unexcept error.'
67: inputf.close()
68: outputf.close()
69: return True
70:
71: #--------------------------------------------------------------
72: def deal_dir(src):
73: # dir exist or not
74: if not os.path.exists(src):
75: print 'Error: dir - %s is not exist.'%s (src)
76: return False
77: filelists = os.listdir(src)
78: for eachfile in filelists:
79: eachfile = src + '/' +eachfile
80: if os.path.isdir(eachfile):
81: deal_dir(eachfile)
82: elif os.path.isfile(eachfile):
83: deal_file(eachfile)
84: return True
85:
86: #--------------------------------------------------------------
87: def main():
88: if len(sys.argv) < 2:
89: usage()
90: sys.exit(1)
91: src = sys.argv[1]
92: # get absolute dir/file path
93: if os.path.isdir(src):
94: dire = os.path.abspath(src)
95: dirFlag = True
96: elif os.path.isfile(src):
97: fl = os.path.abspath(src)
98: dirFlag = False
99: else:
100: print 'File input error'
101:
102: # deal
103: if dirFlag:
104: deal_dir(dire)
105: else:
106: deal_file(fl)
107: print 'Successful handle file.'
108:
109: #--------------------------------------------------------------
110: if __name__ == '__main__':
111: main()
使用正则表达式
1: # delete all the comments and empty line of a C/C++ source file
2: import os, sys,string,re,glob
3:
4: # /*..*/ //...
5: Rule1 = "(\/\*(\s|.)*?\*\/)|(\/\/.*)"
6: c1=re.compile(Rule1)
7:
8: #-------------------------------------------------------------
9: def usage():
10: print u'''
11: help: del_comment.py <filename | dirname>
12: '''
13: #--------------------------------------------------------------
14: def deal_file(src):
15: # file exist or not
16: if not os.path.exists(src):
17: print 'Error: file - %s doesn\'t exist.'% src
18: return False
19: if os.path.islink(src):
20: print 'Error: file - %s is a link.'
21: return False
22: filetype = (os.path.splitext(src))[1]
23: if not filetype in ['.c','.h','.cpp','.hh','.cc']:
24: return False
25: try:
26: if not os.access(src, os.W_OK):
27: os.chmod(src, 0664)
28: except:
29: print 'Error: you can not chang %s\'s mode.'% src
30:
31: inputf = open(src, 'r')
32: outputfilename = (os.path.splitext(src))[0] + '_no_comment'+filetype
33: outputf = open(outputfilename, 'w')
34:
35: lines=inputf.read()
36: inputf.close()
37: lines=re.sub(Rule1,"",lines)
38: outputf.write(lines)
39: outputf.close()
40: return True
41:
42: #--------------------------------------------------------------
43: def deal_dir(src):
44: # dir exist or not
45: if not os.path.exists(src):
46: print 'Error: dir - %s is not exist.'%s (src)
47: return False
48: filelists = os.listdir(src)
49: for eachfile in filelists:
50: eachfile = src + '/' +eachfile
51: if os.path.isdir(eachfile):
52: deal_dir(eachfile)
53: elif os.path.isfile(eachfile):
54: deal_file(eachfile)
55: return True
56:
57: #--------------------------------------------------------------
58: def main():
59: if len(sys.argv) < 2:
60: usage()
61: sys.exit(1)
62: src = sys.argv[1]
63: # get absolute dir/file path
64: if os.path.isdir(src):
65: dire = os.path.abspath(src)
66: dirFlag = True
67: elif os.path.isfile(src):
68: fl = os.path.abspath(src)
69: dirFlag = False
70: else:
71: print 'File input error'
72:
73: # deal
74: if dirFlag:
75: deal_dir(dire)
76: else:
77: deal_file(fl)
78: print 'Successful handle file.'
79:
80: #--------------------------------------------------------------
81: if __name__ == '__main__':
82: main()
使用示例
待处理文件：
1: #ifndef _RS232_H_
2: #define _RS232_H_
3:
4: /* the maximum number of ports we are willing to open */
5: #define MAX_PORTS 4
6:
7: /*this array hold information about each port we have opened */
8: struct PortInfo{
9: int busy;
10: char name[32];
11: int handle;
12: };
13:
14: int OpenCom(int portNo,const char deviceName[],long baudRate);
15: int CloseCom(int portNo);
16: int ComRd(int portNo,char buf[],int maxCnt,int Timeout);
17: int ComWrt(int portNo,const char * buf,int maxCnt);
18:
19: //long GetBaudRate(long baudRate);
20: //int OpenComConfig(int port,
21: // const char deviceName[],
22: // long baudRate,
23: // int parity,
24: // int dataBits,
25: // int stopBits,
26: // int iqSize,
27: // int oqSize);
28:
29: #endif
处理结果：
1: #ifndef _RS232_H_
2: #define _RS232_H_
3: #define MAX_PORTS 4
4: struct PortInfo{
5: int busy;
6: char name[32];
7: int handle;
8: };
9: int OpenCom(int portNo,const char deviceName[],long baudRate);
10: int CloseCom(int portNo);
11: int ComRd(int portNo,char buf[],int maxCnt,int Timeout);
12: int ComWrt(int portNo,const char * buf,int maxCnt);
13: #endif
在使用Python正则表达式处理的时候，有一个问题，就是没法删除文件中的空行。如果想删除空行，可能还得一行行读进来，把长度为0的行不保存。这是目前感觉到的难点。
本文转自feisky博客园博客，原文链接：http://www.cnblogs.com/feisky/archive/2010/12/09/1901349.html，如需转载请自行联系原作者