VT100 in Python

Nick Craig-Wood nick at craig-wood.com
Mon Sep 14 11:29:57 CEST 2009


Wolfgang Rohdewald <wolfgang at rohdewald.de> wrote:
>  On Sunday 13 September 2009, Nadav Chernin wrote:
> > I'm writing program that read data from some instrument trough
> >  RS232. This instrument send data in VT100 format. I need only to
> >  extract the text without all other characters that describe how to
> >  represent data on the screen. Is there some library in python for
> >  converting VT100 strings?
> 
>  that should be easy using regular expressions

At a basic level parsing VT100 is quite easy, so you can get rid of
the VT100 control.  They start with ESC, have other characters in the
middle then end with a letter (upper or lowercase), so a regexp will
make short work of them.  Something like r"\x1B[^A-Za-z]*[A-Za-z]"

You might need to parse the VT100 stream as VT100 builds up a screen
buffer though and the commands don't always come out in the order you
might expect.

I think twisted has VT100 emulator, but I couldn't find it in a brief
search just now.

You'll find various others (like this one) if you search some more

http://svn.python.org/projects/python/branches/string_methods/Demo/cwilib/vt100.py

-- 
Nick Craig-Wood <nick at craig-wood.com> -- http://www.craig-wood.com/nick



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