Re: Emulating AMS stuff in ConTeXt

[Hans Hagen <pragma@wxs.nl>]

At 07:24 PM 12/7/2002 +0100, you wrote:
>def\startalign{%
>     \startformula
>     \let\\\cr
>     \grabuntil{stopalign}\doeqalign
>}
>\def\doeqalign#1{\eqalign{#1\cr}\stopformula}

                              ^^ better make that \crcr in order to catch 
users \\

>\let\stopalign\relax
>
>These allow me to write:
>
>\startalign
>   a & = b = \\
>     & = c
>\stopalign

isn't \startmathalign a better choice?

>and everything is fine. Yet I cannot do
>
>\placeformula[hook]
>\startalign
>   a & = b = \\
>     & = c
>\stopalign
>
>because of expansion problems. Why? How can I define the stuff?

took me a couple of cd's to uncover this -)

(1) placeformula has to look ahead, and the next command is not seen as 
something math; so,
(2) i made another lookahead, and then
(3) we ran into those \cr & and # things that may not always show up 
everywhere, so
(4) i had to rewrite a low level macro that i didn't like rewriting, i.e.
(5) i had to use a variant i'd always thought that could be avoided

so, you spoiled my afternoon -)

btw, if you isolate/collect the ams math that's not yet in m-newmat, i can 
see if/how i can add it there in a configurable way, so if some things 
fails, we can look into it later

you can try the version i just uploaded

Hans


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