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* New language feature: domain checks, which check whether a function

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argument has a valid value, i.e., is in a certain domain.  E.g.,

    { foo : [true false]
    , bar : ["a" "b" "c"]
    }: ...

  This previously could be done using assertions, but domain checks
  will allow the buildfarm to automatically extract the configuration
  space from functions.
This commit is contained in:
Eelco Dolstra 2006-07-24 16:35:34 +00:00
parent 88acffa20a
commit f4c5531d92
4 changed files with 40 additions and 13 deletions
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9
src/libexpr/nixexpr.cc
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@ -220,15 +220,16 @@ static void checkVarDefs2(set<Expr> & done, const ATermMap & defs, Expr e)
else if (matchFunction(e, formals, body, pos)) {
ATermMap defs2(defs);
for (ATermIterator i(formals); i; ++i) {
Expr d1, d2;
ATerm d1, d2;
if (!matchFormal(*i, name, d1, d2)) abort();
defs2.set(name, (ATerm) ATempty);
}
for (ATermIterator i(formals); i; ++i) {
Expr dummy, deflt;
ATerm valids, deflt;
set<Expr> done2;
if (matchFormal(*i, name, dummy, deflt)) /* !!! check dummy */
checkVarDefs2(done2, defs2, deflt);
matchFormal(*i, name, valids, deflt);
checkVarDefs2(done, defs, valids);
checkVarDefs2(done2, defs2, deflt);
}
set<Expr> done2;
checkVarDefs2(done2, defs2, body);