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/*-*-MACSYMA-*-*/
eval_when([translate,batch,demo],
if get('sharem,'version) = false
then load(autolo))$
herald_package(basic)$
/* These are basic macros, nothing in here should call anything
complicated. PUSH and POP here are the simple version
which do not hack once-only evaluation.
I might say that these macros are around mostly so
that the code for implementing the more complicated
macros, including the once-only stuff, can be simpler.
*/
prog1(statement1,[statements])::=
buildq([statement1,statements,local:?gentemp()],
lambda([local],splice(statements),local)(statement1))$
symbolcheck(x):=
if symbolp(x) then x else error("arg must be a symbol",x)$
push(c,l)::=(symbolcheck(l),buildq([c,l],l:cons(c,l)))$
pop(l)::=(symbolcheck(l),buildq([l],prog1(first(l),l:rest(l))))$
/* TR_EV is a pretty sorry way to get optimization
by Translation-time evaluation. User directed constant-folding
you might call it. TR_EV has other uses. */
tr_ev(x)::=buildq([x],?meval(x))$
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