Re: problems with \hbox inside lua

[Hans Hagen <pragma@wxs.nl>]

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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