lix/src/libstore/path-with-outputs.cc
John Ericson 242f9bf3dc std::visit by reference
I had started the trend of doing `std::visit` by value (because a type
error once mislead me into thinking that was the only form that
existed). While the optomizer in principle should be able to deal with
extra coppying or extra indirection once the lambdas inlined, sticking
with by reference is the conventional default. I hope this might even
improve performance.
2021-09-30 21:35:09 +00:00

72 lines
2.2 KiB
C++

#include "path-with-outputs.hh"
#include "store-api.hh"
namespace nix {
std::string StorePathWithOutputs::to_string(const Store & store) const
{
return outputs.empty()
? store.printStorePath(path)
: store.printStorePath(path) + "!" + concatStringsSep(",", outputs);
}
DerivedPath StorePathWithOutputs::toDerivedPath() const
{
if (!outputs.empty() || path.isDerivation())
return DerivedPath::Built { path, outputs };
else
return DerivedPath::Opaque { path };
}
std::vector<DerivedPath> toDerivedPaths(const std::vector<StorePathWithOutputs> ss)
{
std::vector<DerivedPath> reqs;
for (auto & s : ss) reqs.push_back(s.toDerivedPath());
return reqs;
}
std::variant<StorePathWithOutputs, StorePath> StorePathWithOutputs::tryFromDerivedPath(const DerivedPath & p)
{
return std::visit(overloaded {
[&](const DerivedPath::Opaque & bo) -> std::variant<StorePathWithOutputs, StorePath> {
if (bo.path.isDerivation()) {
// drv path gets interpreted as "build", not "get drv file itself"
return bo.path;
}
return StorePathWithOutputs { bo.path };
},
[&](const DerivedPath::Built & bfd) -> std::variant<StorePathWithOutputs, StorePath> {
return StorePathWithOutputs { bfd.drvPath, bfd.outputs };
},
}, p.raw());
}
std::pair<std::string_view, StringSet> parsePathWithOutputs(std::string_view s)
{
size_t n = s.find("!");
return n == s.npos
? std::make_pair(s, std::set<string>())
: std::make_pair(((std::string_view) s).substr(0, n),
tokenizeString<std::set<string>>(((std::string_view) s).substr(n + 1), ","));
}
StorePathWithOutputs parsePathWithOutputs(const Store & store, std::string_view pathWithOutputs)
{
auto [path, outputs] = parsePathWithOutputs(pathWithOutputs);
return StorePathWithOutputs { store.parseStorePath(path), std::move(outputs) };
}
StorePathWithOutputs followLinksToStorePathWithOutputs(const Store & store, std::string_view pathWithOutputs)
{
auto [path, outputs] = parsePathWithOutputs(pathWithOutputs);
return StorePathWithOutputs { store.followLinksToStorePath(path), std::move(outputs) };
}
}