Re: [Docutils-users] Re: FW: Another Problem with latex writer

[<eng...@ss...>]

On Mon, 17 Mar 2003, David Abrahams wrote:

> eng...@ss... writes:
>
> > you were a little greedy, this one::
> >
> >   text = re.sub(r'[^{][\\]', r'{\textbackslash}', text)
> >
> > will replace any the backslash AND the preceeding character (except for a
> > brace).
>
> Oops.
>
> > AND there need to be two backslashes.
>
> I'm pretty sure that's wrong: note that they're raw strings.  Did you
> test the result?

yes, i used your snippet
BUT, there was no literal backslash i just recognized that it said
  "	extbackslash" where it shouldnt.

for (my) peaceful sleep i added two lines::

      ::

        using namespace mpl::placeholders;
        mpl::a_line_with\tbackslash
        mpl::a_line_without backslash

which results in ::

   namespace.  In this book we will usually assume that you have
   written
   \begin{ttfamily}\begin{flushleft}
   \mbox{using~namespace~mpl::placeholders;}\\
   \mbox{mpl::a{\_}line{\_}with{\textbackslash}tbackslash}\\
   \mbox{mpl::a{\_}line{\_}without~backslash}
   \end{flushleft}\end{ttfamily}

which looks reasonable to me.

being an ignorant i did not know what this r's meant.
after some trying::

  # assume a c-code line
  # printf("%d\t%s\n",count,message);
  line = open("code.c").readline()
  # >>> line
  # 'printf("%d\\t%s\\n",count,message);'

now to replace all backslashes with TB either or::

  re.sub('\\\\','TB',line)
  re.sub(r'\\','TB',line)

means we have two backslashes in line (\\t) and te regexp for
this is two backslashes '\\' is only one r'\\' gives two.
and for getting '{\textbackslash}'::

  re.sub(r'\\','\\textbackslash',line)

BUT then we have the string ::

  'printf("%d\textbackslasht%s\textbackslashn",count,message);'

which does not have a backslash but an escaped letter t, and prints
as ::

  printf("%d      extbackslasht%s extbackslashn",count,message);

the problem is one cannot enter a single backslash even in a rawstring,
r'\' does not work.

cheers

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