Hi,
\doifelse does not work inside any MP environment. Something really
strange happens if you try to use it. \loggingall tells me what exactly is
happening, but I do not know enough low-level TeX to understand why this
is happening.
Conside this test file
%----------------------
\def\test{string}
\starttext
\doifelse{\test}{string}{test is a string}{or not}
\loggingall
\startMPcode
draw \doifelse{\test}{string}{fullcircle}{fullsquare} scaled 5cm ;
\stopMPcode
\stoptext
%------------------------
It does not compile correctly. Intesting pieces from the log file
(actually the MKII log, since that is more interesting)
\dostartMPcode #1\stopMPcode ->\startuseMPgraphic {@@}#1\stopuseMPgraphic
\useMPgraphic {@@}\endgroup
#1<-draw \doifelse {\test }{string}{fullcircle}{fullsquare} scaled 5cm ;
...
\doifelse #1#2->\edef \!!stringa {#1}\edef \!!stringb {#2}\ifx \!!stringa
\!!stringb \expandafter \firstoftwoarguments \else \expandafter
\secondoftwoargument
s \fi
#1<-\test
#2<-string
\!!stringa ->currentcolor
\test ->string
\!!stringb ->black
{no mode: \ifx: (level 5) entered on line 11}
{false}
{\else: \ifx (level 5) entered on line 11}
{\expandafter}
{\fi: \ifx (level 5) entered on line 11}
.....
\ascii ->
draw \edef currentcolor{string}\edef black{string}fullsquare scaled 5cm ;
{changing \MPascii=undefined}
{into \MPascii=macro:->
draw \edef currentcolor{string\ETC.}
{\the}
Notice the first line of \ascii, and compare that with the definition of
\doifelse. The command \!!stringa inside the definition of \doifelse gets
expanded too soon. Is there any way to get this work, other than doing the
comparison outside the MP code.
Aditya
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