how to remove c++ comments from a cpp file?

[Frank Potter]

I only want to remove the comments which begin with "//".
I did like this, but it doesn't work.

r=re.compile(ur"//[^\r\n]+$", re.UNICODE|re.VERBOSE)
f=file.open("mycpp.cpp","r")
f=unicode(f,"utf8")
r.sub(ur"",f)

Will somebody show me the right way?
Thanks~~

[Gary Herron]

Frank Potter wrote:

I only want to remove the comments which begin with "//".
I did like this, but it doesn't work.

r=re.compile(ur"//[^\r\n]+$", re.UNICODE|re.VERBOSE)
f=file.open("mycpp.cpp","r")
f=unicode(f,"utf8")
r.sub(ur"",f)

Will somebody show me the right way?
Thanks~~

If you expect help with a problem, it would be nice if you told us what
the problem is. What error did you get?

But even without that I see lots of errors:

You must import re before you use it:
import re

Open a file with open((..) not file.open(...).

Once you open the file you must *read* the contents and operate on that:
data = f.read()

Then you ought to close the file:
f.close()

Now you can do your sub on the string in data -- but note, THIS WON'T
CHANGE data, but rather returns a new string which you must assign to
something:

new_data = r.sub(ur"", data)

Then do something with the new string.

Also I fear your regular expression is incorrect.

Cheers,
Gary Herron

[Frank Potter]

On Jan 26, 5:08 pm, Gary Herron <[e-mail]:

Frank Potter wrote:

I only want to remove the comments which begin with "//".
I did like this, but it doesn't work.

r=re.compile(ur"//[^\r\n]+$", re.UNICODE|re.VERBOSE)
f=file.open("mycpp.cpp","r")
f=unicode(f,"utf8")
r.sub(ur"",f)

Will somebody show me the right way?
Thanks~~If you expect help with a problem, it would be nice if you told us what

the problem is. What error did you get?

But even without that I see lots of errors:

You must import re before you use it:
import re

Open a file with open((..) not file.open(...).

Once you open the file you must *read* the contents and operate on that:
data = f.read()

Then you ought to close the file:
f.close()

Now you can do your sub on the string in data -- but note, THIS WON'T
CHANGE data, but rather returns a new string which you must assign to
something:

new_data = r.sub(ur"", data)

Then do something with the new string.

Also I fear your regular expression is incorrect.

Cheers,
Gary Herron

Thank you.
I'm very sorry because I was in a hurry when I post this thread.
I'll post again my code here:

import re
 
f=open("show_btchina.user.js","r").read()
f=unicode(f,"utf8")
 
r=re.compile(ur"//[^\r\n]+$", re.UNICODE|re.VERBOSE)
f_new=r.sub(ur"",f)
 
open("modified.js","w").write(f_new.encode("utf8"))
 

And, the problem is, it seems that only the last comment is removed.
How can I remove all of the comments, please?

[Gabriel Genellina]

At Friday 26/1/2007 06:54, Frank Potter wrote:

>

import re

f=open("show_btchina.user.js","r").read()
f=unicode(f,"utf8")

r=re.compile(ur"//[^\r\n]+$", re.UNICODE|re.VERBOSE)
f_new=r.sub(ur"",f)

open("modified.js","w").write(f_new.encode("utf8"))

And, the problem is, it seems that only the last comment is removed.
How can I remove all of the comments, please?

Note that it's not as easy as simply deleting from // to end of line,
because those characters might be inside a string literal. But if you
can afford the risk, this is a simple way without re:

f = open("show_btchina.user.js","r")
modf = open("modified.js","w")
for line in f:
uline=unicode(line,"utf8")
idx = uline.find("//")
if idx==0:
continue
elif idx>0:
uline = uline[:idx]+'\n'
modf.write(uline.encode("utf8"))
modf.close()
f.close()
--
Gabriel Genellina
Softlab SRL


__________________________________________________
Preguntá. Respondé. Descubrí.
Todo lo que querías saber, y lo que ni imaginabas,
está en Yahoo! Respuestas (Beta).
¡Probalo ya!
http://www.yahoo.com.ar/respuestas

[Frank Potter]

Thank you!

On Jan 26, 6:34 pm, Gabriel Genellina <[e-mail]:

At Friday 26/1/2007 06:54, Frank Potter wrote:

import re

        
                f=open("show_btchina.user.js","r").read()
f=unicode(f,"utf8")
 

 

        

                r=re.compile(ur"//[^\r\n]+$", re.UNICODE|re.VERBOSE)

f_new=r.sub(ur"",f)

 

        

                open("modified.js","w").write(f_new.encode("utf8"))