outputs-spec.hh

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#pragma once
 
#include <cassert>
#include <optional>
#include <set>
#include <variant>
 
#include "lix/libutil/comparator.hh"
#include "lix/libutil/comparator.hh"
#include "lix/libutil/json-fwd.hh"
#include "lix/libutil/variant-wrapper.hh"
 
namespace nix {

typedef std::string OutputName;

typedef std::string_view OutputNameView;
 
struct OutputsSpec {
    struct Names : std::set<OutputName> {
        using std::set<OutputName>::set;
 
        /* These need to be "inherited manually" */
 
        Names(const std::set<OutputName> & s)
            : std::set<OutputName>(s)
        { assert(!empty()); }

        Names(std::set<OutputName> && s)
            : std::set<OutputName>(s)
        { assert(!empty()); }
 
        /* This set should always be non-empty, so we delete this
           constructor in order make creating empty ones by mistake harder.
           */
        Names() = delete;
    };

    struct All : std::monostate { };
 
    typedef std::variant<All, Names> Raw;
 
    Raw raw;
 
    GENERATE_CMP(OutputsSpec, me->raw);
 
    MAKE_WRAPPER_CONSTRUCTOR(OutputsSpec);

    OutputsSpec() = delete;
 
    bool contains(const OutputName & output) const;

    OutputsSpec union_(const OutputsSpec & that) const;

    bool isSubsetOf(const OutputsSpec & outputs) const;

    static OutputsSpec parse(std::string_view s);
    static std::optional<OutputsSpec> parseOpt(std::string_view s);
 
    std::string to_string() const;
 
    static void to_json(JSON & json, const OutputsSpec & t);
    static OutputsSpec from_json(const JSON & json);
};
 
struct ExtendedOutputsSpec {
    struct Default : std::monostate { };
    using Explicit = OutputsSpec;
 
    typedef std::variant<Default, Explicit> Raw;
 
    Raw raw;
 
    GENERATE_CMP(ExtendedOutputsSpec, me->raw);
 
    MAKE_WRAPPER_CONSTRUCTOR(ExtendedOutputsSpec);

    ExtendedOutputsSpec() = delete;

    static std::pair<std::string_view, ExtendedOutputsSpec> parse(std::string_view s);
    static std::optional<std::pair<std::string_view, ExtendedOutputsSpec>> parseOpt(std::string_view s);
 
    std::string to_string() const;
 
    static void to_json(JSON & json, const ExtendedOutputsSpec & spec);
    static ExtendedOutputsSpec from_json(const JSON & t);
};
 
}