catcode change in macros

catcode change in macros

[Wolfgang Schuster]

Hi,

I make in a module the comment sign a simple letter to pass
number formats to a lua function and want to know if should
use another (better) way to change the catodes.


\def\????ax{@@@@ax}

\bgroup

\catcode`\%=11
\catcode`\:=14

\gdef\setupaxis
   {\catcode`\%=11
    \catcode`\:=14
    \dodoubleargument\dosetupaxis}

\gdef\dosetupaxis[#1][#2]:
   {\catcode`\%=11
    \catcode`\:=14
    \def\docommand##1{\getparameters[\????ax##1][#2]}:
    \catcode`\%=14
    \catcode`\:=12
    \processcommalist[#1]\docommand}

\egroup

\setupaxis
   [\c!x,\c!y]
   [\c!format=%d]


Regards,
Wolfgang

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Re: catcode change in macros

[Aditya Mahajan]

On Fri, 14 Nov 2008, Wolfgang Schuster wrote:

> Hi,
>
> I make in a module the comment sign a simple letter to pass
> number formats to a lua function and want to know if should
> use another (better) way to change the catodes.

I think it will be cleaner to use catcode tables. See syst-cat.mkiv.

Aditya
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Re: catcode change in macros

[Aditya Mahajan]

On Fri, 14 Nov 2008, Aditya Mahajan wrote:

> On Fri, 14 Nov 2008, Wolfgang Schuster wrote:
>
>> Hi,
>> 
>> I make in a module the comment sign a simple letter to pass
>> number formats to a lua function and want to know if should
>> use another (better) way to change the catodes.
>
> I think it will be cleaner to use catcode tables. See syst-cat.mkiv.

and syst-cat.tex

Aditya
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Re: catcode change in macros

[Wolfgang Schuster]

Am 14.11.2008 um 19:37 schrieb Aditya Mahajan:

> On Fri, 14 Nov 2008, Aditya Mahajan wrote:
>
>> On Fri, 14 Nov 2008, Wolfgang Schuster wrote:
>>
>>> Hi,
>>>
>>> I make in a module the comment sign a simple letter to pass
>>> number formats to a lua function and want to know if should
>>> use another (better) way to change the catodes.
>>
>> I think it will be cleaner to use catcode tables. See syst-cat.mkiv.
>
> and syst-cat.tex

I already know them but you're right, it's better
to use them and avoid low level code.

P.S. Should I now send all my questions to you or
      still use the mailing list :)

Thanks and regards,
Wolfgang

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Re: catcode change in macros

[Wolfgang Schuster]

Am 14.11.2008 um 19:37 schrieb Aditya Mahajan:

> On Fri, 14 Nov 2008, Aditya Mahajan wrote:
>
>> On Fri, 14 Nov 2008, Wolfgang Schuster wrote:
>>
>>> Hi,
>>>
>>> I make in a module the comment sign a simple letter to pass
>>> number formats to a lua function and want to know if should
>>> use another (better) way to change the catodes.
>>
>> I think it will be cleaner to use catcode tables. See syst-cat.mkiv.
>
> and syst-cat.tex

I keep now my low level solution but with fewer lines.

To help other users with the same question I present
here my solution:

\def\????ax{@@@@ax}

\def\setupaxis
   {\catcode`\%\@@letter
    \dodoubleargument\dosetupaxis}

\def\dosetupaxis[#1][#2]%
   {\def\docommand##1{\getparameters[\????ax##1][#2]}%
    \catcode`\%\@@comment
    \processcommalist[#1]\docommand}

\setupaxis
   [\c!x,\c!y]
   [\c!format=%d]

Regards,
Wolfgang

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___________________________________________________________________________________

Re: catcode change in macros

[Aditya Mahajan]

On Sat, 15 Nov 2008, Wolfgang Schuster wrote:

>
> Am 14.11.2008 um 19:37 schrieb Aditya Mahajan:
>
>> On Fri, 14 Nov 2008, Aditya Mahajan wrote:
>>
>>> On Fri, 14 Nov 2008, Wolfgang Schuster wrote:
>>>
>>>> Hi,
>>>>
>>>> I make in a module the comment sign a simple letter to pass
>>>> number formats to a lua function and want to know if should
>>>> use another (better) way to change the catodes.
>>>
>>> I think it will be cleaner to use catcode tables. See syst-cat.mkiv.
>>
>> and syst-cat.tex
>
> I keep now my low level solution but with fewer lines.

Even though you are still using the mailling list, I will reply :-)

> To help other users with the same question I present
> here my solution:
>
> \def\????ax{@@@@ax}
>
> \def\setupaxis
>   {\catcode`\%\@@letter
>    \dodoubleargument\dosetupaxis}
>
> \def\dosetupaxis[#1][#2]%
>   {\def\docommand##1{\getparameters[\????ax##1][#2]}%
>    \catcode`\%\@@comment
>    \processcommalist[#1]\docommand}
>
> \setupaxis
>   [\c!x,\c!y]
>   [\c!format=%d]

Here you are assuming that whenever \setupaxis will be used, the catcode 
of % is comment. This may not be the case. You can of course, store the 
inital catcode of % and then restore it later, as done by many LaTeX 
packages.

The main advantage of catcode tables is that you can do
\pushcatcodetable, and \popcatcodetable, and not do the book keeping 
yourself. Here is a solution using catcodetables:

\unprotect

% A mixture of \startcatcodetable and \extendcatcodetable
\long\def\startchangecatcodetable#1#2#3\stopchangecatcodetable
   {\bgroup
    \catcodetable\scratchcatcodetable
    \catcodetable#1\relax
    #3%
    \savecatcodetable#2\relax
    \egroup}


\newcatcodetable \LUAstringcatcodes

\startchangecatcodetable \ctxcatcodes \LUAstringcatcodes
   \catcode`\%\@@letter
\stopchangecatcodetable

\protect

\starttext

\pushcatcodetable
\catcodetable\LUAstringcatcodes
% Does this print
Hello world
\popcatcodetable

\stoptext

So, you code now becomes

\unprotect
\def\????ax{@@@@ax}

\def\setupaxis
   {\pushcatcodetable
    \catcodetable\LUAstringcatcodes
    \dodoubleargument\dosetupaxis}

\def\dosetupaxis[#1][#2]%
   {\def\docommand##1{\getparameters[\????ax##1][#2]}%
    \popcatcodetable
    \processcommalist[#1]\docommand}

\setupaxis
   [\c!x,\c!y]
   [\c!format=%d]

Hans, do you think that something like \startchangecatcodetable should be 
added to the core. An old definition of \extendcatcodetable almost does 
that, but does not provide a name to the resulatant catcodetable.

Aditya
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Re: catcode change in macros

[Hans Hagen]

Aditya Mahajan wrote:
> On Sat, 15 Nov 2008, Wolfgang Schuster wrote:
> 
>> Am 14.11.2008 um 19:37 schrieb Aditya Mahajan:
>>
>>> On Fri, 14 Nov 2008, Aditya Mahajan wrote:
>>>
>>>> On Fri, 14 Nov 2008, Wolfgang Schuster wrote:
>>>>
>>>>> Hi,
>>>>>
>>>>> I make in a module the comment sign a simple letter to pass
>>>>> number formats to a lua function and want to know if should
>>>>> use another (better) way to change the catodes.
>>>> I think it will be cleaner to use catcode tables. See syst-cat.mkiv.
>>> and syst-cat.tex
>> I keep now my low level solution but with fewer lines.
> 
> Even though you are still using the mailling list, I will reply :-)
> 
>> To help other users with the same question I present
>> here my solution:
>>
>> \def\????ax{@@@@ax}
>>
>> \def\setupaxis
>>   {\catcode`\%\@@letter
>>    \dodoubleargument\dosetupaxis}
>>
>> \def\dosetupaxis[#1][#2]%
>>   {\def\docommand##1{\getparameters[\????ax##1][#2]}%
>>    \catcode`\%\@@comment
>>    \processcommalist[#1]\docommand}
>>
>> \setupaxis
>>   [\c!x,\c!y]
>>   [\c!format=%d]
> 
> Here you are assuming that whenever \setupaxis will be used, the catcode 
> of % is comment. This may not be the case. You can of course, store the 
> inital catcode of % and then restore it later, as done by many LaTeX 
> packages.
> 
> The main advantage of catcode tables is that you can do
> \pushcatcodetable, and \popcatcodetable, and not do the book keeping 
> yourself. Here is a solution using catcodetables:
> 
> \unprotect
> 
> % A mixture of \startcatcodetable and \extendcatcodetable
> \long\def\startchangecatcodetable#1#2#3\stopchangecatcodetable
>    {\bgroup
>     \catcodetable\scratchcatcodetable
>     \catcodetable#1\relax
>     #3%
>     \savecatcodetable#2\relax
>     \egroup}
> 
> 
> \newcatcodetable \LUAstringcatcodes
> 
> \startchangecatcodetable \ctxcatcodes \LUAstringcatcodes
>    \catcode`\%\@@letter
> \stopchangecatcodetable
> 
> \protect
> 
> \starttext
> 
> \pushcatcodetable
> \catcodetable\LUAstringcatcodes
> % Does this print
> Hello world
> \popcatcodetable
> 
> \stoptext
> 
> So, you code now becomes
> 
> \unprotect
> \def\????ax{@@@@ax}
> 
> \def\setupaxis
>    {\pushcatcodetable
>     \catcodetable\LUAstringcatcodes
>     \dodoubleargument\dosetupaxis}
> 
> \def\dosetupaxis[#1][#2]%
>    {\def\docommand##1{\getparameters[\????ax##1][#2]}%
>     \popcatcodetable
>     \processcommalist[#1]\docommand}
> 
> \setupaxis
>    [\c!x,\c!y]
>    [\c!format=%d]
> 
> Hans, do you think that something like \startchangecatcodetable should be 
> added to the core. An old definition of \extendcatcodetable almost does 
> that, but does not provide a name to the resulatant catcodetable.

i wonder if change is the right name, isn't it more cloning?

anyhow, keep in mind that in mkiv we print back to tex every now and 
then and then we use one of the predefined catcode tables.

Another option is:

  [\c!format=\letterpercent d]

Hans


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               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
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___________________________________________________________________________________

Re: catcode change in macros

[Wolfgang Schuster]

Am 15.11.2008 um 21:41 schrieb Hans Hagen:

> Aditya Mahajan wrote:
>> On Sat, 15 Nov 2008, Wolfgang Schuster wrote:
>>
>>> Am 14.11.2008 um 19:37 schrieb Aditya Mahajan:
>>>
>>>> On Fri, 14 Nov 2008, Aditya Mahajan wrote:
>>>>
>>>>> On Fri, 14 Nov 2008, Wolfgang Schuster wrote:
>>>>>
>>>>>> Hi,
>>>>>>
>>>>>> I make in a module the comment sign a simple letter to pass
>>>>>> number formats to a lua function and want to know if should
>>>>>> use another (better) way to change the catodes.
>>>>> I think it will be cleaner to use catcode tables. See syst- 
>>>>> cat.mkiv.
>>>> and syst-cat.tex
>>> I keep now my low level solution but with fewer lines.
>>
>> Even though you are still using the mailling list, I will reply :-)
>>
>>> To help other users with the same question I present
>>> here my solution:
>>>
>>> \def\????ax{@@@@ax}
>>>
>>> \def\setupaxis
>>>  {\catcode`\%\@@letter
>>>   \dodoubleargument\dosetupaxis}
>>>
>>> \def\dosetupaxis[#1][#2]%
>>>  {\def\docommand##1{\getparameters[\????ax##1][#2]}%
>>>   \catcode`\%\@@comment
>>>   \processcommalist[#1]\docommand}
>>>
>>> \setupaxis
>>>  [\c!x,\c!y]
>>>  [\c!format=%d]
>>
>> Here you are assuming that whenever \setupaxis will be used, the  
>> catcode
>> of % is comment. This may not be the case. You can of course, store  
>> the
>> inital catcode of % and then restore it later, as done by many LaTeX
>> packages.

Right but I dropped catcode tables because I had a problems
with them (see below).

>> The main advantage of catcode tables is that you can do
>> \pushcatcodetable, and \popcatcodetable, and not do the book keeping
>> yourself. Here is a solution using catcodetables:
>>

I can't use it in my macro.

\unprotect

\long\def\startchangecatcodetable#1#2#3\stopchangecatcodetable
   {\bgroup
    \catcodetable\scratchcatcodetable
    \catcodetable#1\relax
    #3%
    \savecatcodetable#2\relax
    \egroup}

\newcatcodetable \LUAstringcatcodes

\startchangecatcodetable \ctxcatcodes \LUAstringcatcodes
   \catcode`\%\@@letter
\stopchangecatcodetable

\def\????ax{@@@@ax}

\def\setupaxis
   {\pushcatcodetable
    \catcodetable\LUAstringcatcodes
    \dodoubleargument\dosetupaxis}

\def\dosetupaxis[#1][#2]%
   {\def\docommand##1{\getparameters[\????ax##1][#2]}%
    \popcatcodetable
    \processcommalist[#1]\docommand}

\setupaxis
   [\c!x,\c!y]
   [\c!format=%d]

\protect

\starttext
\getvalue{@@@@axxformat}
\stoptext

>> Hans, do you think that something like \startchangecatcodetable  
>> should be
>> added to the core. An old definition of \extendcatcodetable almost  
>> does
>> that, but does not provide a name to the resulatant catcodetable.
>
> i wonder if change is the right name, isn't it more cloning?
>
> anyhow, keep in mind that in mkiv we print back to tex every now and
> then and then we use one of the predefined catcode tables.

I save \@@@@axxformat in a Lua table and use it only in string.format,
it never appears in the output.

> Another option is:
>
>  [\c!format=\letterpercent d]

No interest, if I want %d to format my string in Lua I want
to write also in this format in TeX.

Wolfgang


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