On Sun, Mar 04, 2012 at 08:06:54AM -0500, Julien Rioux wrote:
> On 01/03/2012 8:34 PM, Rav Chandra wrote:
> >Hello all, firstly thanks for the great work on LyX. It is a superb
> >piece of software.
> >
> >However, I've encountered a problem when using graphics (i.e. images)
> >in-conjunction with the grammar environment of the syntax.sty package.
> >Specifically, if I include both an image and a grammar environment
> >then the document will fail to compile with "Undefined control
> >sequence errors". What is extremely curious, however, is that if your
> >export the same file fro LyX to LaTeX (pdflatex) you will then have a
> >..tex file which compiles perfectly, without error!
> >
> >Unfortunately, I am not familiar enough with LyX to understand how to
> >investigate this further. However, if useful, I can certainly follow
> >instructions to diagnose/debug if pointed in the right direction.
> >
> >Reproducibility:
> >- have tested using LyX 2.0.2 on Linux (Ubuntu 10.04), OS X 10.7, and
> >Windows Vista
> >- have tested using LyX 2.0.3 on Linux (Ubuntu 10.04)
> >
> >Steps:
> >- make an empty document, insert 1 image
> >- add "\usepackage{syntax}" to document preamble
> >- insert lyx code:
> >"""
> >\begin{grammar}
> ><hello> ::= "WORLD"
> >\end{grammar}
> >"""
> >- view as pdflatex will produce error
> >- export as .tex and then run command "$ pdflatex file.tex" will NOT have
> >error
> >
> >Kind regards
> >Rav
> >
>
> When compiled from within LyX, the .tex file and the graphic file
> are copied to a temporary directory where (pdf)latex compilation
> occurs. In this process the file names are altered. That's just the
> way LyX works. It seems that syntax.sty interferes with that
> process, causing compilation to fail (for reproducing your bug, it
> was sufficient to add a graphic and the \usepackage{syntax} line).
> LyX cannot guarantee to support every latex package available. I
> hope you can find a fix or an alternative on your end.
The problem here is that syntax.sty makes '_' an active character.
A possible workaround is restoring its catcode after loading
syntax.sty, i.e., something like this:
\usepackage{syntax}
\AtBeginDocument{\catcode`\_=8}
--
Enrico
