Re: [NTG-context] lua code prevents compilation

1 Apr 2015


      On 4/2/2015 1:21 AM, Pablo Rodriguez wrote:
...
On 03/30/2015 10:33 PM, Hans Hagen wrote:
...
On 3/30/2015 5:19 PM, Pablo Rodriguez wrote:
...
[...]
For some reason unknown to me, the only way to compile the sample is to
remove the luacode snippet.
I need the lua code to have underscore hyphenation in type commands. And
I need two extra \definehyphenationfeatures and \sethyphenationfeatures
to invoke it.
Have I hit a bug or what am I missing?
I don't know as i see nothing at all with that code .. this is more fun:
Many thanks for your reply, Hans,
The following code shows the problem:
\startluacode
function document.addfunnyhyphen(tfmdata)
         local underscore = utf.byte("_")
         local char       = tfmdata.characters[underscore]
         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
%~ \definefontfamily[ornamenta][rm][TypographyTribute]
\definehyphenationfeatures[underscore][righthyphenchar="FE000]
\setuphyphenation[method=traditional]
\sethyphenationfeatures[strict]
\setupbodyfont[ornamenta]
\starttext
\hsize\zeropoint
{\sethyphenationfeatures[underscore]\tt pandoc}
A
\stoptext
If you uncomment the line with the font definition, font loading crashes
compilation. It only crashes with this font
(http://www.dafont.com/typographytribute.font) or FontAwesome
(http://www.fontawesome.io).
Both lack the underscore glyph. This causes the crash, since it works
fine if I replace the glyph with an existing glyph in the font.
Error message:
code.tex: ! LuaTeX fatal error error in error handling
\font_helpers_low_level_define ...\scaledfontmode
                                                   \relax \ifcase
\scaledfont...
\font_helpers_trigger_define ..._identifier_class
                                                   \csname
\v_font_identifier...
\applyfontclassstrategies ...\fontface \endcsname
                                                   \else \expandafter
\font_h...
\font_helpers_synchronize_font ...classstrategies
                                                   \fi \setfalse
\c_font_auto...
\rm ->\ifmmode \mathrm \else \normalrm
                                        \fi
\font_basics_switch_style ...ntstyle #1\endcsname
                                                   \edef \fontstyle
{#1}\ifmm...
...
Would it be possible that ConTeXt silently ignores that the font doesn’t
contain the glyph?
the message is fuzzy (and i have to check a lua stack issue maybe but 
not now) ... if char is nil then char.depth is an error
...
I think this might be a bug.
...
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
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                                           Hans Hagen | PRAGMA ADE
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