Re: [NTG-context] Math letters in commands

[Hans Åberg]

> On 13 Sep 2016, at 07:57, Hans Hagen  wrote:

> sure, but when you do
> 
> \appendtoks
>  \catcode`\‘=\active
>  \def‘#1’{\csname #1\endcsname}
> \to …

FYI, this does not work for me; I must use LuaTeX \letcharcode:

\def\usemathcommand#1’{\csname #1\endcsname}

\appendtoks
  \catcode`‘=\activecatcode
  \letcharcode `‘ \usemathcommand
\to \everymathematics

Then “$” must be followed by a character other than ‘ for this command to be 
seen, but it works with “$$”.


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Re: [NTG-context] Math letters in commands

[Hans Åberg]

> On 13 Sep 2016, at 07:57, Hans Hagen  wrote:
> 
> On 9/12/2016 10:02 PM, Hans Åberg wrote:

>> 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

OK. TeX does not parse the way I expected.


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Re: [NTG-context] Math letters in commands

[Hans Hagen]

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 $ ‘퐝퐢퐦’ 푉$, because $‘퐝퐢퐦’ 푉$ 
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
-
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Re: [NTG-context] Math letters in commands

[Hans Åberg]

> On 12 Sep 2016, at 21:45, Hans Hagen  wrote:

> fwiw, the current beta makes math characters also letters now

I saw it. Fine!


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Re: [NTG-context] Math letters in commands

[Hans Åberg]

> 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 $ ‘퐝퐢퐦’ 푉$, because $‘퐝퐢퐦’ 푉$ 
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}


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Re: [NTG-context] Math letters in commands

[Hans Hagen]

On 9/12/2016 8:25 PM, Hans Åberg wrote:

Found a workaround: The idea is to use \csname …\endcsname with two delimiters 
not likely to be used in math mode, below chosen to ‘…’.

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)


\appendtoks
\catcode`퐝\lettercatcode
\catcode`퐢\lettercatcode
\catcode`퐦\lettercatcode
\to \everymathematics

\definemathcommand[퐝퐢퐦][nolop]{\mfunction{퐦퐢퐝}}

\starttext

Note that $ \퐝퐢퐦 푉 = 햫$, although $\dim 푉 = 4$.

And a bug: $\퐝퐢퐦 푉$.

\stoptext

fwiw, the current beta makes math characters also letters now

-
  Hans Hagen | PRAGMA ADE
  Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
   tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-
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Re: [NTG-context] Math letters in commands

[Hans Åberg]

Found a workaround: The idea is to use \csname …\endcsname with two delimiters 
not likely to be used in math mode, below chosen to ‘…’.

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.


\setupbodyfont[xits,10pt]

\setupmathematics[lcgreek=normal, default=normal]

\def\usemathcommand#1’{\csname #1\endcsname}

\appendtoks
  \catcode`‘=\activecatcode
  \letcharcode `‘ \usemathcommand
\to \everymathematics

\definemathcommand[퐝퐢퐦][nolop]{\mfunction{퐝퐢퐦}}

\starttext

Note that $ ‘퐝퐢퐦’ 푉 = 햫$, although $\dim 푉 = 4$.

And a bug: $‘퐝퐢퐦’ 푉$.

\stoptext


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