textext within ConTeXt

textext within ConTeXt

[Mohammad Hossein Bateni]

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Hi,

I can't understand why the following code does not work.  Could someone
help me out here?

\starttext
\startMPpage
draw textext("\convertnumber{r}{12}");
draw textext("\convertnumber{r}{" & "12" & "}");
\stopMPpage
\stoptext

The first draw statement works perfectly.  But the second one throws out
errors and complains as follows:

.....test.tex: ! Missing number, treated as zero


<to be read again>



<argument> \number "

          & "12" & "

\romannumerals #1->\clf_romannumerals \numexpr #1

                                                 \relax

<argument> ... draw textext("\convertnumber {r}{" & "12" & "}

                                                  ");

\meta_process_graphic ...currentMPformat }data {#1

                                                  ;}initializations
{\meta_f...

\page_fitting_stop_command ...eter \c!command {#1}

                                                  \page_fitting_stop_normal

Is there a workaround here?  Ultimately I want to replace "12" with a loop
variable in MetaPost.

Thanks,
~MHB

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Re: textext within ConTeXt

[Alan Braslau]

On Sun, 3 Mar 2019 12:52:53 -0500
Mohammad Hossein Bateni <bateni@gmail.com> wrote:

> Hi,
> 
> I can't understand why the following code does not work.  Could someone
> help me out here?
> 
> \starttext
> \startMPpage
> draw textext("\convertnumber{r}{12}");
> draw textext("\convertnumber{r}{" & "12" & "}");
> \stopMPpage
> \stoptext
> 
> The first draw statement works perfectly.  But the second one throws out
> errors and complains as follows:

Because luatex intercepts and processes \convertnumber{r}{
and tries to pass this result to MP as a string, not the other way around.

Alan
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Re: textext within ConTeXt

[Mohammad Hossein Bateni]

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This is quite counterintuitive... It also happens if I define a string
variable, use concatenate operator to set its value, and then finally pass
the string to textext macro.

Is there a way to get around this issue?

On Sun, Mar 3, 2019, 1:13 PM Alan Braslau <braslau.list@comcast.net> wrote:

> On Sun, 3 Mar 2019 12:52:53 -0500
> Mohammad Hossein Bateni <bateni@gmail.com> wrote:
>
> > Hi,
> >
> > I can't understand why the following code does not work.  Could someone
> > help me out here?
> >
> > \starttext
> > \startMPpage
> > draw textext("\convertnumber{r}{12}");
> > draw textext("\convertnumber{r}{" & "12" & "}");
> > \stopMPpage
> > \stoptext
> >
> > The first draw statement works perfectly.  But the second one throws out
> > errors and complains as follows:
>
> Because luatex intercepts and processes \convertnumber{r}{
> and tries to pass this result to MP as a string, not the other way around.
>
> Alan
>

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