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c998e0172f
These methods would previously fail on the other `Installable`s, so moving them to this class is more correct as to where they actually work. Additionally, a `InstallableValueCommand` is created to make it easier (or rather no worse than before) to write commands that just work on `InstallableValue`s. Besides being a cleanup to avoid failing default methods, this gets us closer to https://github.com/NixOS/rfcs/pull/134.
45 lines
1.3 KiB
C++
45 lines
1.3 KiB
C++
#include "installable-value.hh"
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#include "eval-cache.hh"
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namespace nix {
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std::vector<ref<eval_cache::AttrCursor>>
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InstallableValue::getCursors(EvalState & state)
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{
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auto evalCache =
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std::make_shared<nix::eval_cache::EvalCache>(std::nullopt, state,
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[&]() { return toValue(state).first; });
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return {evalCache->getRoot()};
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}
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ref<eval_cache::AttrCursor>
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InstallableValue::getCursor(EvalState & state)
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{
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/* Although getCursors should return at least one element, in case it doesn't,
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bound check to avoid an undefined behavior for vector[0] */
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return getCursors(state).at(0);
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}
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static UsageError nonValueInstallable(Installable & installable)
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{
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return UsageError("installable '%s' does not correspond to a Nix language value", installable.what());
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}
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InstallableValue & InstallableValue::require(Installable & installable)
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{
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auto * castedInstallable = dynamic_cast<InstallableValue *>(&installable);
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if (!castedInstallable)
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throw nonValueInstallable(installable);
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return *castedInstallable;
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}
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ref<InstallableValue> InstallableValue::require(ref<Installable> installable)
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{
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auto castedInstallable = installable.dynamic_pointer_cast<InstallableValue>();
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if (!castedInstallable)
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throw nonValueInstallable(*installable);
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return ref { castedInstallable };
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}
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}
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