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// Copyright (c) 2023, QuantStack and Mamba Contributors
//
// Distributed under the terms of the BSD 3-Clause License.
//
// The full license is in the file LICENSE, distributed with this software.
#ifndef MAMBA_SPECS_VERSION_HPP
#define MAMBA_SPECS_VERSION_HPP
#include <optional>
#include <string>
#include <string_view>
#include <vector>
#include <fmt/format.h>
#include "mamba/specs/error.hpp"
namespace mamba::specs
{
/**
* A succession of a number and a lowercase literal.
*
* Comparison is done lexicographically, with the number first and the literal second.
* Certain literals have special meaning:
* "*" < "dev" < "_"< any other literal < "" < "post"
*/
class VersionPartAtom
{
public:
VersionPartAtom() noexcept = default;
VersionPartAtom(std::size_t numeral) noexcept;
VersionPartAtom(std::size_t numeral, std::string_view literal);
// The use of a template is only meant to prevent ambiguous conversions
template <typename Char>
VersionPartAtom(std::size_t numeral, std::basic_string<Char> literal);
[[nodiscard]] auto numeral() const noexcept -> std::size_t;
[[nodiscard]] auto literal() const& noexcept -> const std::string&;
auto literal() && noexcept -> std::string;
[[nodiscard]] auto str() const -> std::string;
auto operator==(const VersionPartAtom& other) const -> bool;
auto operator!=(const VersionPartAtom& other) const -> bool;
auto operator<(const VersionPartAtom& other) const -> bool;
auto operator<=(const VersionPartAtom& other) const -> bool;
auto operator>(const VersionPartAtom& other) const -> bool;
auto operator>=(const VersionPartAtom& other) const -> bool;
private:
// Stored in decreasing size order for performance
std::string m_literal = "";
std::size_t m_numeral = 0;
};
extern template VersionPartAtom::VersionPartAtom(std::size_t, std::string);
/**
* A sequence of VersionPartAtom meant to represent a part of a version (e.g. major, minor).
*
* Version parts can have a arbitrary number of atoms, such as {0, "post"} {1, "dev"}
* in 0post1dev
*
* @see Version::parse for how this is computed from strings.
* @todo Use a small vector of expected size 1 if performance ar not good enough.
*/
using VersionPart = std::vector<VersionPartAtom>;
/**
* A sequence of VersionPart meant to represent all parts of a version.
*
* CommonVersion are composed of an arbitrary positive number parts, such as major, minor.
* They are typically separated by dots, for instance the three parts in 3.0post1dev.4 are
* {{3, ""}}, {{0, "post"}, {1, "dev"}}, and {{4, ""}}.
*
* @see Version::parse for how this is computed from strings.
* @todo Use a small vector of expected size 4 if performance ar not good enough.
*/
using CommonVersion = std::vector<VersionPart>;
/**
* A version according to Conda specifications.
*
* A version is composed of
* - A epoch number, usually 0;
* - A regular version,
* - An optional local.
* These elements are used to lexicographicaly compare two versions.
*
* @see https://github.com/conda/conda/blob/main/conda/models/version.py
*/
class Version
{
public:
static constexpr char epoch_delim = '!';
static constexpr char local_delim = '+';
static constexpr char part_delim = '.';
static constexpr char part_delim_alt = '-';
static constexpr char part_delim_special = '_';
static auto parse(std::string_view str) -> expected_parse_t<Version>;
/** Construct version ``0.0``. */
Version() noexcept = default;
Version(std::size_t epoch, CommonVersion version, CommonVersion local = {}) noexcept;
[[nodiscard]] auto epoch() const noexcept -> std::size_t;
[[nodiscard]] auto version() const noexcept -> const CommonVersion&;
[[nodiscard]] auto local() const noexcept -> const CommonVersion&;
/**
* A string representation of the version.
*
* May not always be the same as the parsed string (due to reconstruction) but reparsing
* this string will give the same version.
* ``v == Version::parse(v.str())``.
*/
[[nodiscard]] auto str() const -> std::string;
/**
* A string truncated of extended representation of the version.
*
* Represent the string with the desired number of parts.
* If the actual number of parts is larger, then the string is truncated.
* If the actual number of parts is smalle, then the string is expanded with zeros.
*/
[[nodiscard]] auto str(std::size_t level) const -> std::string;
[[nodiscard]] auto operator==(const Version& other) const -> bool;
[[nodiscard]] auto operator!=(const Version& other) const -> bool;
[[nodiscard]] auto operator<(const Version& other) const -> bool;
[[nodiscard]] auto operator<=(const Version& other) const -> bool;
[[nodiscard]] auto operator>(const Version& other) const -> bool;
[[nodiscard]] auto operator>=(const Version& other) const -> bool;
/**
* Return true if this version starts with the other prefix.
*
* For instance 1.2.3 starts with 1.2 but not the opposite.
* Because Conda versions can contain an arbitrary number of segments, some of which
* with alpha releases, this function cannot be written as a comparison.
* One would need to comoare with a version with infinitely pre-release segments.
*/
[[nodiscard]] auto starts_with(const Version& prefix) const -> bool;
/**
* Return true if this version is a compatible upgrade to the given one.
*
* For instance 1.3.1 is compatible with 1.2.1 at level 0 (first component `1 == 1``),
* at level 1 (second component `` 3 >= 2``), but not at level two (because the second
* component is strictly larger ``3 > 2``).
* Compatible versions are always smaller than the current version.
*/
[[nodiscard]] auto compatible_with(const Version& older, std::size_t level) const -> bool;
private:
// Stored in decreasing size order for performance
CommonVersion m_version = {};
CommonVersion m_local = {};
std::size_t m_epoch = 0;
};
namespace version_literals
{
auto operator""_v(const char* str, std::size_t len) -> Version;
}
}
template <>
struct fmt::formatter<mamba::specs::VersionPartAtom>
{
auto parse(format_parse_context& ctx) -> decltype(ctx.begin());
auto format(const ::mamba::specs::VersionPartAtom atom, format_context& ctx) const
-> decltype(ctx.out());
};
template <>
struct fmt::formatter<mamba::specs::Version>
{
std::optional<std::size_t> m_level;
auto parse(format_parse_context& ctx) -> decltype(ctx.begin());
auto format(const ::mamba::specs::Version v, format_context& ctx) const -> decltype(ctx.out());
};
#endif