mirror of
https://github.com/NixOS/nix
synced 2024-09-19 10:50:24 -04:00
bc83b9dc1f
Known behavior changes: - `MemorySourceAccessor`'s comparison operators no longer forget to compare the `SourceAccessor` base class. Progress on #10832 What remains for that issue is hopefully much easier!
129 lines
3.2 KiB
C++
129 lines
3.2 KiB
C++
#pragma once
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///@file
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#include <cassert>
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#include <optional>
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#include <set>
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#include <variant>
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#include "json-impls.hh"
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#include "variant-wrapper.hh"
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namespace nix {
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/**
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* An (owned) output name. Just a type alias used to make code more
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* readible.
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*/
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typedef std::string OutputName;
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/**
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* A borrowed output name. Just a type alias used to make code more
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* readible.
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*/
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typedef std::string_view OutputNameView;
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struct OutputsSpec {
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/**
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* A non-empty set of outputs, specified by name
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*/
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struct Names : std::set<OutputName> {
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using std::set<OutputName>::set;
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/* These need to be "inherited manually" */
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Names(const std::set<OutputName> & s)
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: std::set<OutputName>(s)
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{ assert(!empty()); }
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/**
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* Needs to be "inherited manually"
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*/
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Names(std::set<OutputName> && s)
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: std::set<OutputName>(s)
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{ assert(!empty()); }
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/* This set should always be non-empty, so we delete this
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constructor in order make creating empty ones by mistake harder.
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*/
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Names() = delete;
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};
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/**
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* The set of all outputs, without needing to name them explicitly
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*/
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struct All : std::monostate { };
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typedef std::variant<All, Names> Raw;
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Raw raw;
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bool operator == (const OutputsSpec &) const = default;
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// TODO libc++ 16 (used by darwin) missing `std::set::operator <=>`, can't do yet.
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bool operator < (const OutputsSpec & other) const {
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return raw < other.raw;
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}
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MAKE_WRAPPER_CONSTRUCTOR(OutputsSpec);
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/**
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* Force choosing a variant
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*/
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OutputsSpec() = delete;
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bool contains(const OutputName & output) const;
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/**
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* Create a new OutputsSpec which is the union of this and that.
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*/
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OutputsSpec union_(const OutputsSpec & that) const;
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/**
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* Whether this OutputsSpec is a subset of that.
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*/
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bool isSubsetOf(const OutputsSpec & outputs) const;
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/**
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* Parse a string of the form 'output1,...outputN' or '*', returning
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* the outputs spec.
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*/
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static OutputsSpec parse(std::string_view s);
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static std::optional<OutputsSpec> parseOpt(std::string_view s);
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std::string to_string() const;
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};
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struct ExtendedOutputsSpec {
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struct Default : std::monostate { };
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using Explicit = OutputsSpec;
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typedef std::variant<Default, Explicit> Raw;
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Raw raw;
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bool operator == (const ExtendedOutputsSpec &) const = default;
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// TODO libc++ 16 (used by darwin) missing `std::set::operator <=>`, can't do yet.
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bool operator < (const ExtendedOutputsSpec &) const;
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MAKE_WRAPPER_CONSTRUCTOR(ExtendedOutputsSpec);
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/**
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* Force choosing a variant
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*/
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ExtendedOutputsSpec() = delete;
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/**
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* Parse a string of the form 'prefix^output1,...outputN' or
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* 'prefix^*', returning the prefix and the extended outputs spec.
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*/
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static std::pair<std::string_view, ExtendedOutputsSpec> parse(std::string_view s);
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static std::optional<std::pair<std::string_view, ExtendedOutputsSpec>> parseOpt(std::string_view s);
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std::string to_string() const;
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};
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}
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JSON_IMPL(OutputsSpec)
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JSON_IMPL(ExtendedOutputsSpec)
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