On 3/1/2015 7:24 AM, Jaroslav Hajtmar wrote:
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
Dne 27.2.2015 v 19:04 Hans Hagen napsal(a): 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
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