Re: [NTG-context] Addressing glyphs in Lua

10 Oct 2018


      On 10/10/2018 8:46 AM, Marco Patzer wrote:
...
On Tue, 9 Oct 2018 23:36:32 +0200
Hans Hagen  wrote:
...
...
Hi!
I have two questions regarding addressing glyphs in Lua:
1) How to address glyphs in slots as e.g. U+F0029?
2) How to address glyphs by name?
Use:
\startluacode
    fonts.handlers.otf.addfeature {
      name = "foo",
      type = "substitution",
      data      = { [0xF0029] = 0xF0030 }, -- ← doesn't work
    }
\stopluacode
On 10/9/2018 10:40 PM, Marco Patzer wrote:
this is a mnwe .. make a mwe with at least a font
Sorry, here it is:
\startluacode
   fonts.handlers.otf.addfeature {
     name = "phone",
     type = "substitution",
     data      = { [0x260E] = 0xF003A }, --  doens't work
   }
\stopluacode
\definefontfeature [phone] [phone=yes]
\definefallbackfamily [mainface] [serif] [MarVoSym] [range=0x260E,
features=phone] \definefontfamily     [mainface] [serif] [TeX Gyre
Pagella] \setupbodyfont        [mainface]
\starttext
   substitution: \utfchar{"260E} %% black telephone
   \blank direct:
   \resolvedglyphdirect {name:marvosym}{n:Mobilefone} %% works
\stoptext
%% glyph name and slot taken from
%%
%% \usemodule [fnt-10]
%% \starttext
%%   \ShowCompleteFont{name:marvosym}{10pt}{1}
%% \stoptext
...
... anyway, glyph names should normally work (given that they are
sane ones, because in context we strip some)
The question is how to input the name in the Lua code (here:
“Mobilefone”). And it seems like substitutions don't work beyond
0xFFFF.
(1) use glyph names, so Telefon here
(2) enable node mode
(3) force a nocheck
(in a next beta i'll also support the P<original private> lookup for 
feature extensions)

\startluacode
fonts.handlers.otf.addfeature {
     name    = "phone",
     type    = "substitution",
     nocheck = true,
     data    = { [0x260E] = "Telefon" },
}
\stopluacode

\definefontfeature [phone] [mode=node,phone=yes]

\definefallbackfamily [mainface] [serif] [MarVoSym] [range=0x260E, 
features=phone]
\definefontfamily     [mainface] [serif] [TeX Gyre Pagella]
\setupbodyfont        [mainface]

\starttext
   substitution: \utfchar{"260E}                      %% black telephone
   \blank direct:
   \resolvedglyphdirect {name:marvosym}{n:Mobilefone} %% works
   \resolvedglyphdirect {name:marvosym}{n:PF003A}     %% works
   \resolvedglyphdirect {name:marvosym}{n:Telefon}    %% works
\stoptext


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