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This commit is contained in:
Eelco Dolstra 2015-03-06 14:24:08 +01:00
parent 9f3eb56b46
commit 5badc8f975
2 changed files with 25 additions and 19 deletions
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31
src/libexpr/eval.cc
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@ -765,6 +765,23 @@ void ExprVar::eval(EvalState & state, Env & env, Value & v)
}
static string showAttrPath(EvalState & state, Env & env, const AttrPath & attrPath)
{
std::ostringstream out;
bool first = true;
for (auto & i : attrPath) {
if (!first) out << '.'; else first = false;
try {
out << getName(i, state, env);
} catch (Error & e) {
assert(!i.symbol.set());
out << "\"${" << *i.expr << "}\"";
}
}
return out.str();
}
unsigned long nrLookups = 0;
void ExprSelect::eval(EvalState & state, Env & env, Value & v)
@ -791,16 +808,8 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
}
} else {
state.forceAttrs(*vAttrs, pos);
if ((j = vAttrs->attrs->find(name)) == vAttrs->attrs->end()) {
AttrPath staticPath;
AttrPath::const_iterator j;
for (j = attrPath.begin(); j != i; ++j)
staticPath.push_back(AttrName(getName(*j, state, env)));
staticPath.push_back(AttrName(getName(*j, state, env)));
for (j = j + 1; j != attrPath.end(); ++j)
staticPath.push_back(*j);
throwEvalError("attribute ‘%1%’ missing, at %2%", showAttrPath(staticPath), pos);
}
if ((j = vAttrs->attrs->find(name)) == vAttrs->attrs->end())
throwEvalError("attribute ‘%1%’ missing, at %2%", name, pos);
}
vAttrs = j->value;
pos2 = j->pos;
@ -812,7 +821,7 @@ void ExprSelect::eval(EvalState & state, Env & env, Value & v)
} catch (Error & e) {
if (pos2 && pos2->file != state.sDerivationNix)
addErrorPrefix(e, "while evaluating the attribute ‘%1%’ at %2%:\n",
showAttrPath(attrPath), *pos2);
showAttrPath(state, env, attrPath), *pos2);
throw;
}