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#include "installable-value.hh"
#include "eval-cache.hh"
namespace nix {
std::vector<ref<eval_cache::AttrCursor>>
InstallableValue::getCursors(EvalState & state)
{
auto evalCache =
std::make_shared<nix::eval_cache::EvalCache>(std::nullopt, state,
[&]() { return toValue(state).first; });
return {evalCache->getRoot()};
}
ref<eval_cache::AttrCursor>
InstallableValue::getCursor(EvalState & state)
{
/* Although getCursors should return at least one element, in case it doesn't,
bound check to avoid an undefined behavior for vector[0] */
return getCursors(state).at(0);
}
static UsageError nonValueInstallable(Installable & installable)
{
return UsageError("installable '%s' does not correspond to a Nix language value", installable.what());
}
InstallableValue & InstallableValue::require(Installable & installable)
{
auto * castedInstallable = dynamic_cast<InstallableValue *>(&installable);
if (!castedInstallable)
throw nonValueInstallable(installable);
return *castedInstallable;
}
ref<InstallableValue> InstallableValue::require(ref<Installable> installable)
{
auto castedInstallable = installable.dynamic_pointer_cast<InstallableValue>();
if (!castedInstallable)
throw nonValueInstallable(*installable);
return ref { castedInstallable };
}
std::optional<DerivedPathWithInfo> InstallableValue::trySinglePathToDerivedPaths(Value & v, const PosIdx pos, std::string_view errorCtx)
{
if (v.type() == nPath) {
auto storePath = v.path().fetchToStore(state->store);
return {{
.path = DerivedPath::Opaque {
.path = std::move(storePath),
},
.info = make_ref<ExtraPathInfo>(),
}};
}
else if (v.type() == nString) {
return {{
.path = DerivedPath::fromSingle(
state->coerceToSingleDerivedPath(pos, v, errorCtx)),
.info = make_ref<ExtraPathInfo>(),
}};
}
else return std::nullopt;
}
}
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