problems with \hbox inside lua

problems with \hbox inside lua

[Mojca Miklavec]

Dear list,

I cannot figure out what I am doing wrong here. If I remove \hbox, it
works fine, but I would like to draw a table.

\starttext
\startluacode
function draw_table(unicode_start,n_columns)
  for i=0,0xF do
    tex.print('\\dontleavehmode\\definedfont[Serif at 20pt]\\kern0pt')
    for j=0,n_columns do
      --tex.print('\\hbox{ \\char %d }', unicode_start+i*16+j)
      tex.print('\\hbox to 1.5em{\\hss %s \\hss}',
unicode.utf8.char(unicode_start+i*16+j))
    end
    tex.print('\\crlf')
  end
end

draw_table(0x00C0,4)
\stopluacode
\stoptext

Any hints welcome.

Thanks,
    Mojca
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Re: problems with \hbox inside lua

[luigi scarso]

On Thu, Dec 23, 2010 at 1:57 PM, Mojca Miklavec
<mojca.miklavec.lists@gmail.com> wrote:
> Dear list,
>
> I cannot figure out what I am doing wrong here. If I remove \hbox, it
> works fine, but I would like to draw a table.
>
> \starttext
> \startluacode
> function draw_table(unicode_start,n_columns)
>  for i=0,0xF do
>    tex.print('\\dontleavehmode\\definedfont[Serif at 20pt]\\kern0pt')
>    for j=0,n_columns do
>      --tex.print('\\hbox{ \\char %d }', unicode_start+i*16+j)
>      tex.print('\\hbox to 1.5em{\\hss %s \\hss}',
> unicode.utf8.char(unicode_start+i*16+j))
>    end
>    tex.print('\\crlf')
>  end
> end
>
> draw_table(0x00C0,4)
> \stopluacode
> \stoptext
>
> Any hints welcome.

I don't know but for the moment this works
\starttext
\startluacode
function draw_table(unicode_start,n_columns)
 for i=0,0xF do
   tex.print('\\dontleavehmode\\definedfont[Serif at 20pt]\\kern0pt')
   for j=0,n_columns do
     local d = string.format( "\\hbox to 1.5em{\\hss \%s
\\hss}",unicode.utf8.char(unicode_start+i*16+j))
     tex.print(d)
   end
   tex.print('\\crlf')
 end
end

draw_table(0x00C0,4)
\stopluacode
\stoptext


-- 
luigi
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___________________________________________________________________________________

Re: problems with \hbox inside lua

[Peter Münster]

On Thu, Dec 23 2010, Mojca Miklavec wrote:

>       tex.print('\\hbox to 1.5em{\\hss %s \\hss}',

tex.print() does not handle the %s.   context() does.

So just replace tex.print() by context().

Peter

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Re: problems with \hbox inside lua

[luigi scarso]

On Thu, Dec 23, 2010 at 2:09 PM, Peter Münster <pmlists@free.fr> wrote:
> On Thu, Dec 23 2010, Mojca Miklavec wrote:
>
>>       tex.print('\\hbox to 1.5em{\\hss %s \\hss}',
>
> tex.print() does not handle the %s.   context() does.
>
> So just replace tex.print() by context().
Right, this also works

\starttext
\startluacode
function draw_table(unicode_start,n_columns)
 for i=0,0xF do
   tex.print('\\dontleavehmode\\definedfont[Serif at 20pt]\\kern0pt')
   for j=0,n_columns do
     context('\\hbox to 1.5em{\\hss %s
\\hss}',unicode.utf8.char(unicode_start+i*16+j))
   end
   tex.print('\\crlf')
 end
end

draw_table(0x00C0,4)
\stopluacode
\stoptext


-- 
luigi
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___________________________________________________________________________________

Re: problems with \hbox inside lua

[Hans Hagen]

On 23-12-2010 2:36, luigi scarso wrote:
> On Thu, Dec 23, 2010 at 2:09 PM, Peter Münster<pmlists@free.fr>  wrote:
>> On Thu, Dec 23 2010, Mojca Miklavec wrote:
>>
>>>        tex.print('\\hbox to 1.5em{\\hss %s \\hss}',
>>
>> tex.print() does not handle the %s.   context() does.
>>
>> So just replace tex.print() by context().
> Right, this also works
>
> \starttext
> \startluacode
> function draw_table(unicode_start,n_columns)
>   for i=0,0xF do
>     tex.print('\\dontleavehmode\\definedfont[Serif at 20pt]\\kern0pt')
>     for j=0,n_columns do
>       context('\\hbox to 1.5em{\\hss %s
> \\hss}',unicode.utf8.char(unicode_start+i*16+j))
>     end
>     tex.print('\\crlf')
>   end
> end
>
> draw_table(0x00C0,4)
> \stopluacode
> \stoptext

without backslashes:

function draw_table(unicode_start,n_columns)
     context.start()
     context.definedfont{"Serif at 20pt"}
     for i=0,0xF do
         context.dontleavehmode()
         for j=0,n_columns do
         --  context('\\hbox to 1.5em{\\hss 
%s\\hss}',unicode.utf8.char(unicode_start+i*16+j))
             context.hbox(false,"to 1.5em")
             context.bgroup()
             context.hss()
             context(unicode.utf8.char(unicode_start+i*16+j))
             context.hss()
             context.egroup()
         end
         context.crlf()
     end
     context.stop()
end

cleaner:

function draw_table(unicode_start,n_columns)
     context.start()
     context.definedfont { "Serif at 20pt" }
     context.starttabulate { 
string.format("*{%s}{|w(1.5em)}|",n_columns+1) }
     for i=0,0xF do
         context.NC()
         for j=0,n_columns do
             context(unicode.utf8.char(unicode_start+i*16+j))
             context.NC()
         end
         context.NR()
     end
     context.stoptabulate()
     context.stop()
end

Hans



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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

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___________________________________________________________________________________

Re: problems with \hbox inside lua

[Mojca Miklavec]

On Thu, Dec 23, 2010 at 15:52, Hans Hagen wrote:
>
> cleaner:
>
> function draw_table(unicode_start,n_columns)
>    context.start()
>    context.definedfont { "Serif at 20pt" }
>    context.starttabulate { string.format("*{%s}{|w(1.5em)}|",n_columns+1) }

Great, thanks! (I wanted to create a proper table at some point, but
didn't take time to think about how to create an arbitrary number of
columns.)

But then I have another question: how can I use \HL and \VL? The
following code doesn't create any line at all:

function draw_table(unicode_start,n_columns)
	context.bgroup()
	context.definedfont { "Serif at 20pt" }
	context.starttable { string.format("*{%s}{|w(1.2em)}|", n_columns) }

	for i=0,0xF do
		context.VL()

		for j=0,n_columns-1 do
			context(unicode.utf8.char(unicode_start+i+16*j))
			context.VL()
		end
		context.NR()
		context.HL()
	end
	context.stoptable()
	context.egroup()
end

Mojca

PS: I still don't know the reason why my example fails, but I will
ignore that for a moment since this does the job as well.
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___________________________________________________________________________________

Re: problems with \hbox inside lua

[Mojca Miklavec]

On Thu, Dec 23, 2010 at 18:06, Mojca Miklavec
<mojca.miklavec.lists@gmail.com> wrote:
>
> But then I have another question: how can I use \HL and \VL? The
> following code doesn't create any line at all:

I'm sorry. I was compiling the wrong file.

Mojca
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___________________________________________________________________________________

Re: problems with \hbox inside lua

[luigi scarso]

On Thu, Dec 23, 2010 at 6:06 PM, Mojca Miklavec
<mojca.miklavec.lists@gmail.com> wrote:
> PS: I still don't know the reason why my example fails
catcode , I suppose


-- 
luigi
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___________________________________________________________________________________

Re: problems with \hbox inside lua

[Peter Münster]

On Thu, Dec 23 2010, luigi scarso wrote:

> > PS: I still don't know the reason why my example fails

> catcode , I suppose

Indeed. The %-sign starts a comment in TeX.

\starttext
\startluacode
tex.print("\\hbox{ %s }", "a string")
\stopluacode
\stoptext

is nearly the same as

\starttext
\hbox{ %s }  a string
\stoptext

In both cases, the error message is:

! Missing } inserted.

Cheers, Peter

-- 
Contact information: http://pmrb.free.fr/contact/
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___________________________________________________________________________________