issue with font and lua code

issue with font and lua code

[Pablo Rodriguez]

Hans,

I have the following sample (it includes Lua code for underscore
hyphenation):

    \startluacode
        function document.addfunnyhyphen(tfmdata)
            local underscore = utf.byte("_")
            local char       = tfmdata.characters[underscore]
            if not char then return end
            tfmdata.characters[0xFE000]   = {
                width    = 0,
                height   = 0,
                depth    = 0,
                commands = {
                    { "right", -char.width },
                    { "down", char.depth },
                    { "slot", 1, underscore },
                }
            }
        end
    utilities.sequencers.appendaction("aftercopyingcharacters",
    "after","document.addfunnyhyphen")
    \stopluacode

    \definehyphenationfeatures
        [underscore]
        [righthyphenchar="FE000]

    \setuphyphenation
        [method=traditional]

    \sethyphenationfeatures
        [strict]

    \definefontfamily[svb][rm][SV Basic Manual]

    \setupbodyfont[svb]

    \starttext
    \hyphenatedword{legibility}
    \stoptext

For some reason, the font gives the following error with the Lua code
(font can be downloaded from http://dl.dafont.com/dl/?f=sv_basic_manual):

lua error       > lua error on line 33 in file svb.tex:
.../ctxbeta/tex/texmf-context/tex/context/base/font-ctx.lua:1194: bad
argument #9 to 'define' (number expected, got nil)
stack traceback:
	[C]: in function 'define'
	.../ctxbeta/tex/texmf-context/tex/context/base/font-ctx.lua:1194: in
function <.../ctxbeta/tex/texmf-context/tex/context/base/font-ctx.lua:1049>
33 >>      \setupbodyfont[svb]

The weird thing here is that the Lua code isn’t applied to the
problematic font.

Is there a way to fix this strange interaction?

Many thanks for your help,


Pablo
-- 
http://www.ousia.tk
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___________________________________________________________________________________

Re: issue with font and lua code

[Hans Hagen]

On 7/20/2015 6:49 PM, Pablo Rodriguez wrote:
> Hans,
>
> I have the following sample (it includes Lua code for underscore
> hyphenation):
>
>      \startluacode
>          function document.addfunnyhyphen(tfmdata)
>              local underscore = utf.byte("_")
>              local char       = tfmdata.characters[underscore]
>              if not char then return end
>              tfmdata.characters[0xFE000]   = {
>                  width    = 0,
>                  height   = 0,
>                  depth    = 0,
>                  commands = {
>                      { "right", -char.width },
>                      { "down", char.depth },
>                      { "slot", 1, underscore },
>                  }
>              }
>          end
>      utilities.sequencers.appendaction("aftercopyingcharacters",
>      "after","document.addfunnyhyphen")
>      \stopluacode
>
>      \definehyphenationfeatures
>          [underscore]
>          [righthyphenchar="FE000]
>
>      \setuphyphenation
>          [method=traditional]
>
>      \sethyphenationfeatures
>          [strict]
>
>      \definefontfamily[svb][rm][SV Basic Manual]
>
>      \setupbodyfont[svb]
>
>      \starttext
>      \hyphenatedword{legibility}
>      \stoptext
>
> For some reason, the font gives the following error with the Lua code
> (font can be downloaded from http://dl.dafont.com/dl/?f=sv_basic_manual):
>
> lua error       > lua error on line 33 in file svb.tex:
> .../ctxbeta/tex/texmf-context/tex/context/base/font-ctx.lua:1194: bad
> argument #9 to 'define' (number expected, got nil)
> stack traceback:
> 	[C]: in function 'define'
> 	.../ctxbeta/tex/texmf-context/tex/context/base/font-ctx.lua:1194: in
> function <.../ctxbeta/tex/texmf-context/tex/context/base/font-ctx.lua:1049>
> 33 >>      \setupbodyfont[svb]
>
> The weird thing here is that the Lua code isn’t applied to the
> problematic font.
>
> Is there a way to fix this strange interaction?

in that font the underscore has no depth, so:

             commands = {
                 { "right", -char.width },
                 { "down", char.depth or 0 },
                 { "slot", 1, underscore },
             }

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

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: issue with font and lua code

[Pablo Rodriguez]

On 07/24/2015 10:26 AM, Hans Hagen wrote:
> On 7/20/2015 6:49 PM, Pablo Rodriguez wrote:
>> [...]
>> For some reason, the font gives the following error with the Lua code
>> (font can be downloaded from http://dl.dafont.com/dl/?f=sv_basic_manual):
>>
>> lua error       > lua error on line 33 in file svb.tex:
>> .../ctxbeta/tex/texmf-context/tex/context/base/font-ctx.lua:1194: bad
>> argument #9 to 'define' (number expected, got nil)
>> stack traceback:
>> 	[C]: in function 'define'
>> 	.../ctxbeta/tex/texmf-context/tex/context/base/font-ctx.lua:1194: in
>> function <.../ctxbeta/tex/texmf-context/tex/context/base/font-ctx.lua:1049>
>> 33 >>      \setupbodyfont[svb]
>>
>> The weird thing here is that the Lua code isn’t applied to the
>> problematic font.
>>
>> Is there a way to fix this strange interaction?
> 
> in that font the underscore has no depth, so:
> 
>              commands = {
>                  { "right", -char.width },
>                  { "down", char.depth or 0 },
>                  { "slot", 1, underscore },
>              }

Many thanks for your reply and for the fix, Hans.

It works like charm.


Pablo
-- 
http://www.ousia.tk
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________