forked from lix-project/lix
115 lines
2.9 KiB
C++
115 lines
2.9 KiB
C++
#pragma once
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///@file
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#include "util.hh"
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#include "path.hh"
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#include "realisation.hh"
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#include "outputs-spec.hh"
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#include "comparator.hh"
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#include <variant>
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#include <nlohmann/json_fwd.hpp>
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namespace nix {
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class Store;
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/**
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* An opaque derived path.
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*
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* Opaque derived paths are just store paths, and fully evaluated. They
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* cannot be simplified further. Since they are opaque, they cannot be
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* built, but they can fetched.
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*/
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struct DerivedPathOpaque {
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StorePath path;
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nlohmann::json toJSON(ref<Store> store) const;
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std::string to_string(const Store & store) const;
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static DerivedPathOpaque parse(const Store & store, std::string_view);
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GENERATE_CMP(DerivedPathOpaque, me->path);
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};
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/**
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* A derived path that is built from a derivation
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*
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* Built derived paths are pair of a derivation and some output names.
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* They are evaluated by building the derivation, and then replacing the
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* output names with the resulting outputs.
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*
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* Note that does mean a derived store paths evaluates to multiple
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* opaque paths, which is sort of icky as expressions are supposed to
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* evaluate to single values. Perhaps this should have just a single
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* output name.
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*/
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struct DerivedPathBuilt {
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StorePath drvPath;
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OutputsSpec outputs;
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/**
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* Uses `^` as the separator
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*/
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std::string to_string(const Store & store) const;
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/**
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* Uses `!` as the separator
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*/
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std::string to_string_legacy(const Store & store) const;
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/**
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* The caller splits on the separator, so it works for both variants.
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*/
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static DerivedPathBuilt parse(const Store & store, std::string_view drvPath, std::string_view outputs);
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nlohmann::json toJSON(ref<Store> store) const;
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GENERATE_CMP(DerivedPathBuilt, me->drvPath, me->outputs);
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};
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using _DerivedPathRaw = std::variant<
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DerivedPathOpaque,
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DerivedPathBuilt
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>;
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/**
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* A "derived path" is a very simple sort of expression that evaluates
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* to (concrete) store path. It is either:
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*
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* - opaque, in which case it is just a concrete store path with
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* possibly no known derivation
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*
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* - built, in which case it is a pair of a derivation path and an
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* output name.
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*/
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struct DerivedPath : _DerivedPathRaw {
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using Raw = _DerivedPathRaw;
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using Raw::Raw;
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using Opaque = DerivedPathOpaque;
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using Built = DerivedPathBuilt;
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inline const Raw & raw() const {
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return static_cast<const Raw &>(*this);
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}
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/**
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* Uses `^` as the separator
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*/
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std::string to_string(const Store & store) const;
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/**
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* Uses `!` as the separator
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*/
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std::string to_string_legacy(const Store & store) const;
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/**
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* Uses `^` as the separator
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*/
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static DerivedPath parse(const Store & store, std::string_view);
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/**
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* Uses `!` as the separator
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*/
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static DerivedPath parseLegacy(const Store & store, std::string_view);
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};
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typedef std::vector<DerivedPath> DerivedPaths;
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}
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