Re: [NTG-context] Math letters in commands

13 Sep 2016

      On 9/12/2016 10:02 PM, Hans Åberg wrote:
...
...
On 12 Sep 2016, at 21:45, Hans Hagen  wrote:
On 9/12/2016 8:25 PM, Hans Åberg wrote:
...
...
But then there seems to be a bug in the LuaTex \letcharcode command: There must be a character between “$” and the first occurring \activecatcode letter. Possibly this also causes a bug in \startformula, as discussed before.
it's not a bug .. tex looks ahead for a second $ and in the process expands  the next token which happens to be a letter at that point so it gets injected as letter (it's the way tex works)
I’m not sure what you mean here: I must write $ ‘𝐝𝐢𝐦’ 𝑉$, because $‘𝐝𝐢𝐦’ 𝑉$ will not see the \catcode`‘=\activecatcode. So LuaTeX must see an ordinary letter after $ before it can see an \activecatcode character.
It does not happen with TeX using
  \catcode`\‘=\active
  \def‘#1’{\csname #1\endcsname}
sure, but when you do

\appendtoks
   \catcode`\‘=\active
   \def‘#1’{\csname #1\endcsname}
\to ...

only tokens get added to the register ... so the ‘ after the \def is not 
active (yet)

in addition when tex sees a $ it will look for a next token (in case 
it's a $ for display mode) and it sees a quote (no everymath doen then) 
which it will push back

Hans

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------