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nix/src/libstore/outputs-spec.cc
Sergei Zimmerman 3ba221025f
libstore/outputs-spec: Drop usage of std::regex
std::regex is a really bad tool for parsing things, since
it tends to overflow the stack pretty badly. See the build failure
under ASan in [^].

[^]: https://hydra.nixos.org/build/310077167/nixlog/5
2025-10-13 23:58:20 +03:00

180 lines
5.2 KiB
C++

#include <nlohmann/json.hpp>
#include <string_view>
#include "nix/store/path.hh"
#include "nix/store/store-dir-config.hh"
#include "nix/util/util.hh"
#include "nix/store/outputs-spec.hh"
#include "nix/util/strings-inline.hh"
namespace nix {
bool OutputsSpec::contains(const std::string & outputName) const
{
return std::visit(
overloaded{
[&](const OutputsSpec::All &) { return true; },
[&](const OutputsSpec::Names & outputNames) { return outputNames.count(outputName) > 0; },
},
raw);
}
std::optional<OutputsSpec> OutputsSpec::parseOpt(std::string_view s)
{
try {
return parse(s);
} catch (BadStorePathName &) {
return std::nullopt;
}
}
OutputsSpec OutputsSpec::parse(std::string_view s)
{
using namespace std::string_view_literals;
if (s == "*"sv)
return OutputsSpec::All{};
auto names = splitString<StringSet>(s, ",");
for (const auto & name : names)
checkName(name);
return OutputsSpec::Names{std::move(names)};
}
std::optional<std::pair<std::string_view, ExtendedOutputsSpec>> ExtendedOutputsSpec::parseOpt(std::string_view s)
{
auto found = s.rfind('^');
if (found == std::string::npos)
return std::pair{s, ExtendedOutputsSpec::Default{}};
auto specOpt = OutputsSpec::parseOpt(s.substr(found + 1));
if (!specOpt)
return std::nullopt;
return std::pair{s.substr(0, found), ExtendedOutputsSpec::Explicit{std::move(*specOpt)}};
}
std::pair<std::string_view, ExtendedOutputsSpec> ExtendedOutputsSpec::parse(std::string_view s)
{
std::optional spec = parseOpt(s);
if (!spec)
throw Error("invalid extended outputs specifier '%s'", s);
return *spec;
}
std::string OutputsSpec::to_string() const
{
return std::visit(
overloaded{
[&](const OutputsSpec::All &) -> std::string { return "*"; },
[&](const OutputsSpec::Names & outputNames) -> std::string { return concatStringsSep(",", outputNames); },
},
raw);
}
std::string ExtendedOutputsSpec::to_string() const
{
return std::visit(
overloaded{
[&](const ExtendedOutputsSpec::Default &) -> std::string { return ""; },
[&](const ExtendedOutputsSpec::Explicit & outputSpec) -> std::string {
return "^" + outputSpec.to_string();
},
},
raw);
}
OutputsSpec OutputsSpec::union_(const OutputsSpec & that) const
{
return std::visit(
overloaded{
[&](const OutputsSpec::All &) -> OutputsSpec { return OutputsSpec::All{}; },
[&](const OutputsSpec::Names & theseNames) -> OutputsSpec {
return std::visit(
overloaded{
[&](const OutputsSpec::All &) -> OutputsSpec { return OutputsSpec::All{}; },
[&](const OutputsSpec::Names & thoseNames) -> OutputsSpec {
OutputsSpec::Names ret = theseNames;
ret.insert(thoseNames.begin(), thoseNames.end());
return ret;
},
},
that.raw);
},
},
raw);
}
bool OutputsSpec::isSubsetOf(const OutputsSpec & that) const
{
return std::visit(
overloaded{
[&](const OutputsSpec::All &) { return true; },
[&](const OutputsSpec::Names & thoseNames) {
return std::visit(
overloaded{
[&](const OutputsSpec::All &) { return false; },
[&](const OutputsSpec::Names & theseNames) {
bool ret = true;
for (auto & o : theseNames)
if (thoseNames.count(o) == 0)
ret = false;
return ret;
},
},
raw);
},
},
that.raw);
}
} // namespace nix
namespace nlohmann {
using namespace nix;
#ifndef DOXYGEN_SKIP
OutputsSpec adl_serializer<OutputsSpec>::from_json(const json & json)
{
auto names = json.get<StringSet>();
if (names == StringSet({"*"}))
return OutputsSpec::All{};
else
return OutputsSpec::Names{std::move(names)};
}
void adl_serializer<OutputsSpec>::to_json(json & json, const OutputsSpec & t)
{
std::visit(
overloaded{
[&](const OutputsSpec::All &) { json = std::vector<std::string>({"*"}); },
[&](const OutputsSpec::Names & names) { json = names; },
},
t.raw);
}
ExtendedOutputsSpec adl_serializer<ExtendedOutputsSpec>::from_json(const json & json)
{
if (json.is_null())
return ExtendedOutputsSpec::Default{};
else {
return ExtendedOutputsSpec::Explicit{json.get<OutputsSpec>()};
}
}
void adl_serializer<ExtendedOutputsSpec>::to_json(json & json, const ExtendedOutputsSpec & t)
{
std::visit(
overloaded{
[&](const ExtendedOutputsSpec::Default &) { json = nullptr; },
[&](const ExtendedOutputsSpec::Explicit & e) { adl_serializer<OutputsSpec>::to_json(json, e); },
},
t.raw);
}
#endif
} // namespace nlohmann