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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[NTG-context] Math letters in commands

[Hans Åberg]

Just found that the code below does not work as intended, because \퐝퐢퐦 will be 
parsed as \퐝 followed by 퐢퐦. Can’t tell if it ought to be changed, though one 
could think other cases where it might be natural. The command definition of \퐝 
works though.


\setupbodyfont[xits,10pt]

\setupmathematics[lcgreek=normal, default=normal]

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

\starttext

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

\stoptext


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