[NTG-context] Incompatibility catcodes of characters in ConTeXt and PlainTeX

Hans Hagen pragma at wxs.nl
Sun Mar 1 11:05:12 CET 2015


On 3/1/2015 7:24 AM, Jaroslav Hajtmar wrote:
> Dne 27.2.2015 v 19:04 Hans Hagen napsal(a):
>> On 2/27/2015 5:53 PM, Jaroslav Hajtmar wrote:
>>> Hello ConTeXist.
>>> Petr Olsak (maintainer of Czech/Slovak support for TeX) helped me with
>>> simple typing of sign charts. He made a PlainTeX macro who is working
>>> too in ConTeXt (see
>>> http://tex.stackexchange.com/questions/230273/typing-of-math-sign-charts).
>>>
>>>
>>> Petr Olsak (not ConTeXt even LaTeX user) was modified PlainTeX macro to
>>> work in ConTeXt and asked the question:
>>> "Does anybody know why ConTeXt sets catcode of & to 12? This means that
>>> it is incompatible with plain TeX".
>>
>> Which is imo no big deal.
> I did not write that he would give redoing some work, after discovering
> that catcode & is different than in plainTEX.
>>
>>> May I therefore ask , what is the reason that has character & catcode
>>> other than in Knuth PlainTeX?
>>> There are catcodes of other characters incompatible?
>>
>> Because the context table mechanisms don't use & (and never used it)
>> so ther ei sno reason to make & special. The _ and ^ are also normal
>> characters. For now we keep the $ for math (and in math mode the & ^ _
>> work as expected).
>>
>> Although we're to some extend plain compatible it's not our aim, just
>> like we're not amstex, latex, lamstex or anytex compatible.
>>
> Ok. Thanks for the explanation. I wrote to Peter that developer context
> to have a reason, and certainly it would from an ordinary whim not done.
> Even so, I am very satisfied with the degree of compatibility.
> Practically all of my old PlainTeX macros in ConTeXt work fine.

\pushcatcodetable
\catcodetable\texcatcodes

your plain code

\popcatcodetable

but it doesn't help when sources are passed as arguments of macros under 
the normal regime


> Thanx
> Jaroslav
>
>> Hans
>>
>>
>>
>> -----------------------------------------------------------------
>>                                           Hans Hagen | PRAGMA ADE
>>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>>     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
>>                                              | www.pragma-pod.nl
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>
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-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
     tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com
                                              | www.pragma-pod.nl
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