0

Am using the Funnelweb literate programming tool, producing Tex output.

In some code I have, I need to insert ASCII code 25 in the C source code.

This works fine as far as producing the C code, but when I run Latex on the .tex file, I get:

! Text line contains an invalid character.
l.1573
...
^^Y

The relevant piece of the .tex file is:

\fwbtx[
...
^Y
...
]

(in Emacs; the ^Y is one character, not two)

and the "fwbtx" macro is defined as:

\def\fwbtx[{%
\begingroup%
\def\par{\leavevmode\endgraf}%
\catcode`\`=\active%
\obeylines%
\def\do##1{\catcode`##1=12 }\dospecials%
\obeyspaces
\parskip=0pt%
\tt%
\fwverbatimgobble}

\def\fwverbatimgobble#1]fwetx={#1\endgroup}

which, I believe, is supposed to escape all non-ASCII characters, so that Tex does not complain.

Can anybody explain what goes wrong?

Is there some simple work-around? Replace the "fwbtx" macro with something?

Any help appreciated.

  • 3
    please post a complete small example that demonstrates the problem it is very hard to debug a fragment like this, although `\catcode``=\active%`` looks wrong (and \tt is bad style for latex, should be \ttfamily) but none of the code shown changes the interpretation of character 25 – David Carlisle Jan 27 '17 at 15:41
  • 1
    given that this is a typesetting system what do you want char 25 to do if it isn't an error? It's the ASCII control character END OF MEDIUM – David Carlisle Jan 27 '17 at 16:00
  • The file is 75k and auto-generated. I thought I'd try this first before trying to create a small example. I thought the idea was that that character (ASCII 25) should be replaced with something else. (It is there in the code as a symbol in a menu label.) – Tomas By Jan 27 '17 at 16:07
  • almost certainly you can do \catcode25=\active\def^^Y{X} and it will come out as an X. (do the definition at the top level not inside some other command) – David Carlisle Jan 27 '17 at 16:09
  • 3
    Instead of asking the same question with a minimal example, it would be better to edit the question to add the MWE. – Schweinebacke Jan 27 '17 at 16:43
1

You can simply change the definition of \fwbeginmacro and \fwendmacro to make ^^Y an ignored character.

\def\fwbeginmacro{\begingroup\fwparskipoff\bigskip\catcode`\^^Y=9 }
\def\fwendmacro{\fwparskipon\par\endgroup}

You can also add a new command

\def\fwignorexxv{\catcode`\^^Y=9}

and use this macro at the begin of the code just after \fwbeginmacro.

If it should not be ignored but shown, you could use something like:

\tolerance=10000
\parindent=0pt
\def\fwparskipon{\parskip=\medskipamount}
\def\fwparskipoff{\parskip=0pt}
\fwparskipon
\raggedbottom
\font\fwfontnote=cmr7
\font\fwfontnorm=cmr10
\font\fwfontnorma=cmr10 scaled \magstep1
\font\fwfontnormb=cmr10 scaled \magstep2
\font\fwfontbold=cmbx10
\font\fwfontbolda=cmbx10 scaled \magstep1
\font\fwfontboldb=cmbx10 scaled \magstep2
\font\fwfontboldc=cmbx10 scaled \magstep3
\font\fwfontboldd=cmbx10 scaled \magstep4
\begingroup
  \catcode`\^^Y=\active
  \gdef\fwshowxxv{\catcode`\^^Y=\active\def^^Y{\textcolor{red}{\textasciicircum
      Y}}}
\endgroup
\def\fwbeginmacro{\begingroup\fwparskipoff\bigskip\fwshowxxv}
\def\fwendmacro{\fwparskipon\par\endgroup}
\def\fwmacroname#1#2{{\sl #1\/}$\lbrack$#2$\rbrack$}
\def\fwfilename#1#2{{\bf #1}$\lbrack$#2$\rbrack$}
\def\fwzero#1{{\bf Z}}
\def\fwmany#1{{\bf M}}
\def\fwlib#1{{\bf L}}
\def\fwequals{ $\equiv$}
\def\fwplusequals{ $+\equiv$}
\def\fwodef{\parindent=15pt\vskip0pt$\lbrace$\parindent=20pt}
\def\fwcdef{$\rbrace$\vskip0pt\parindent=0pt}
\def\fwoquote{`}
\def\fwcquote{'}
\def\fwoparen{$($}
\def\fwcomma{$,$}
\def\fwcparen{$)$}
\def\fwparam#1{$\diamond #1$}
\def\fwparams#1{$(\diamond #1)$}
\def\fwbeginmacronotes{\begingroup\baselineskip=9pt\smallskip}
\def\fwnote#1{{\fwfontnote #1}\par}
\def\fwisafile#1{\fwnote{#1}}
\def\fwusedin#1{\fwnote{#1}}
\def\fwseealso#1{\fwnote{#1}}
\def\fwendmacronotes{\endgroup}
{\catcode`\`=\active \gdef`{\relax\lq}}
{\obeyspaces\global\let =\ }
\def\fwbtx[{%
\begingroup%
\def\par{\leavevmode\endgraf}%
\catcode`\`=\active%
\obeylines%
\def\do##1{\catcode`##1=12 }\dospecials%
\obeyspaces
\parskip=0pt%
\tt%
\fwverbatimgobble}
\def\fwverbatimgobble#1]fwetx={#1\endgroup}
\def\fwrule{\medskip\hrule\medskip}
\def\fwqh{\hskip1.5em\relax}
\def\fwbeforesec{\penalty-200\bigskip\medskip\par}
\def\fwtocstart#1{\fwrule\leftline{\fwfontbolda Table of Contents}\fwrule}
\def\fwtoca#1#2{\leftline{{\bf #1 #2}}}
\def\fwtocb#1#2{\leftline{\fwqh #1 #2}}
\def\fwtocc#1#2{\leftline{\fwqh\fwqh #1 #2}}
\def\fwtocd#1#2{\leftline{\fwqh\fwqh\fwqh #1 #2}}
\def\fwtoce#1#2{\leftline{\fwqh\fwqh\fwqh\fwqh #1 #2}}
\def\fwtocfinish#1{\fwrule}
\def\fwliba#1#2{\vfill\eject{\fwfontboldc #1 #2}\penalty200\smallskip}
\def\fwlibb#1#2{\fwbeforesec{\fwfontboldb #1 #2}\penalty200\smallskip}
\def\fwlibc#1#2{\fwbeforesec{\fwfontnormb #1 #2}\penalty200\smallskip}
\def\fwlibd#1#2{\fwbeforesec{\bf          #1 #2}\penalty200}
\def\fwlibe#1#2{\fwbeforesec{\bf          #1 #2}}
\def\fwseca#1#2{\fwliba{#1}{#2}}
\def\fwsecb#1#2{\fwlibb{#1}{#2}}
\def\fwsecc#1#2{\fwlibc{#1}{#2}}
\def\fwsecd#1#2{\fwlibd{#1}{#2}}
\def\fwsece#1#2{\fwlibe{#1}{#2}}
\def\fwlit#1{{\tt #1}}
\def\fwemp#1{{\it #1}}
\def\fwnewpage{\vfill\eject}
\def\fwvskip#1{\null\vskip #1mm}
\def\fwfontnormal#1{{\fwfontnorm {#1}}}
\def\fwfonttitle#1{{\fwfontboldd {#1}}}
\def\fwfontsmalltitle#1{{\fwfontboldb {#1}}}
\def\fwleftline#1{\leftline{#1}}
\def\fwcenterline#1{\centerline{#1}}
\def\fwrightline#1{\rightline{#1}}
\def\p#1{{\tt #1}}  % P for Program text.
\def\flagpage#1#2{
   \null
   \vfill
   \centerline{\fwfontboldd #1}
   \vskip 1cm
   \centerline{\fwfontboldd #2}
   \vfill
   \null
   \vfill
}
\documentclass{article}
\usepackage{xcolor}
\begin{document}
\fwbeginmacro
\fwmacroname{Example}{1}\fwequals \fwodef \fwbtx[ABC]fwetx=%
\fwcdef 
\fwbeginmacronotes
\fwusedin{This macro is invoked in definition 2.}
\fwendmacronotes
\fwendmacro
\fwbeginmacro
\fwfilename{ex.txt}{2}\fwequals \fwodef \fwmacroname{Example}{1}\fwbtx[
]fwetx=%
\fwcdef 
\fwbeginmacronotes
\fwisafile{This macro is attached to an output file.}
\fwendmacronotes
\fwendmacro
\end{document}

show the ^Y

But note: This is a very ugly mixture of plainTeX and LaTeX code!

  • Ok, thanks. I think either of these are fine, as I don't really care that much whether or not that character is in the document. – Tomas By Jan 27 '17 at 17:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.