Re: [NTG-context] issue with font and lua code

24 Jul 2015


      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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