#
View Source Version (Elixir v1.15.7)

Functions for parsing and matching versions against requirements.

A version is a string in a specific format or a `Version` generated after parsing via `Version.parse/1`.

Although Elixir projects are not required to follow SemVer, they must follow the format outlined on SemVer 2.0 schema.

## Versions

In a nutshell, a version is represented by three numbers:

    MAJOR.MINOR.PATCH

Pre-releases are supported by optionally appending a hyphen and a series of period-separated identifiers immediately following the patch version. Identifiers consist of only ASCII alphanumeric characters and hyphens (`[0-9A-Za-z-]`):

    "1.0.0-alpha.3"

Build information can be added by appending a plus sign and a series of dot-separated identifiers immediately following the patch or pre-release version. Identifiers consist of only ASCII alphanumeric characters and hyphens (`[0-9A-Za-z-]`):

    "1.0.0-alpha.3+20130417140000.amd64"

## Requirements

Requirements allow you to specify which versions of a given dependency you are willing to work against. Requirements support the common comparison operators such as `>`, `>=`, `<`, `<=`, and `==` that work as one would expect, and additionally the special operator `~>` described in detail further below.

    # Only version 2.0.0
    "== 2.0.0"

    # Anything later than 2.0.0
    "> 2.0.0"

Requirements also support `and` and `or` for complex conditions:

    # 2.0.0 and later until 2.1.0
    ">= 2.0.0 and < 2.1.0"

Since the example above is such a common requirement, it can be expressed as:

    "~> 2.0.0"

`~>` will never include pre-release versions of its upper bound, regardless of the usage of the `:allow_pre` option, or whether the operand is a pre-release version. It can also be used to set an upper bound on only the major version part. See the table below for `~>` requirements and their corresponding translations.

`~>` | Translation
--- | ---
`~> 2.0.0` | `>= 2.0.0 and < 2.1.0`
`~> 2.1.2` | `>= 2.1.2 and < 2.2.0`
`~> 2.1.3-dev` | `>= 2.1.3-dev and < 2.2.0`
`~> 2.0` | `>= 2.0.0 and < 3.0.0`
`~> 2.1` | `>= 2.1.0 and < 3.0.0`

The requirement operand after the `~>` is allowed to omit the patch version, allowing us to express `~> 2.1` or `~> 2.1-dev`, something that wouldn't be allowed when using the common comparison operators.

When the `:allow_pre` option is set `false` in `Version.match?/3`, the requirement will not match a pre-release version unless the operand is a pre-release version. The default is to always allow pre-releases but note that in Hex `:allow_pre` is set to `false`. See the table below for examples.

Requirement | Version | `:allow_pre` | Matches
--- | --- | --- | ---
`~> 2.0` | `2.1.0` | `true` or `false` | `true`
`~> 2.0` | `3.0.0` | `true` or `false` | `false`
`~> 2.0.0` | `2.0.5` | `true` or `false` | `true`
`~> 2.0.0` | `2.1.0` | `true` or `false` | `false`
`~> 2.1.2` | `2.1.6-dev` | `true` | `true`
`~> 2.1.2` | `2.1.6-dev` | `false` | `false`
`~> 2.1-dev` | `2.2.0-dev` | `true` or `false` | `true`
`~> 2.1.2-dev` | `2.1.6-dev` | `true` or `false` | `true`
`>= 2.1.0` | `2.2.0-dev` | `true` | `true`
`>= 2.1.0` | `2.2.0-dev` | `false` | `false`
`>= 2.1.0-dev` | `2.2.6-dev` | `true` or `false` | `true`

# Summary

## Types

build()
major()
minor()
patch()
pre()
requirement()
t()
version()

## Functions

%Version{}

The Version struct.

compare(version1, version2)

Compares two versions.

compile_requirement(requirement)

Compiles a requirement to an internal representation that may optimize matching.

match?(version, requirement, opts \\ [])

Checks if the given version matches the specification.

parse(string)

Parses a version string into a `Version` struct.

parse!(string)

Parses a version string into a `Version`.

parse_requirement(string)

Parses a version requirement string into a `Version.Requirement` struct.

parse_requirement!(string)

Parses a version requirement string into a `Version.Requirement` struct.

to_string(version)

Converts the given version to a string.

# Types

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# build()

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    @type build() :: String.t() | nil

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# major()

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    @type major() :: non_neg_integer()

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# minor()

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    @type minor() :: non_neg_integer()

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# patch()

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    @type patch() :: non_neg_integer()

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# pre()

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    @type pre() :: [String.t() | non_neg_integer()]

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# requirement()

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    @type requirement() :: String.t() | Version.Requirement.t()

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# t()

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    @type t() :: %Version{
      build: build(),
      major: major(),
      minor: minor(),
      patch: patch(),
      pre: pre()
    }

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# version()

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    @type version() :: String.t() | t()

# Functions

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# %Version{}

View Source (struct)

The Version struct.

It contains the fields `:major`, `:minor`, `:patch`, `:pre`, and `:build` according to SemVer 2.0, where `:pre` is a list.

You can read those fields but you should not create a new `Version` directly via the struct syntax. Instead use the functions in this module.

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# compare(version1, version2)

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    @spec compare(version(), version()) :: :gt | :eq | :lt

Compares two versions.

Returns `:gt` if the first version is greater than the second one, and `:lt` for vice versa. If the two versions are equal, `:eq` is returned.

Pre-releases are strictly less than their corresponding release versions.

Patch segments are compared lexicographically if they are alphanumeric, and numerically otherwise.

Build segments are ignored: if two versions differ only in their build segment they are considered to be equal.

Raises a `Version.InvalidVersionError` exception if any of the two given versions are not parsable. If given an already parsed version this function won't raise.

## Examples

    iex> Version.compare("2.0.1-alpha1", "2.0.0")
    :gt

    iex> Version.compare("1.0.0-beta", "1.0.0-rc1")
    :lt

    iex> Version.compare("1.0.0-10", "1.0.0-2")
    :gt

    iex> Version.compare("2.0.1+build0", "2.0.1")
    :eq

    iex> Version.compare("invalid", "2.0.1")
    ** (Version.InvalidVersionError) invalid version: "invalid"

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# compile_requirement(requirement)

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    @spec compile_requirement(Version.Requirement.t()) :: Version.Requirement.t()

Compiles a requirement to an internal representation that may optimize matching.

The internal representation is opaque.

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# match?(version, requirement, opts \\ [])

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    @spec match?(version(), requirement(), keyword()) :: boolean()

Checks if the given version matches the specification.

Returns `true` if `version` satisfies `requirement`, `false` otherwise. Raises a `Version.InvalidRequirementError` exception if `requirement` is not parsable, or a `Version.InvalidVersionError` exception if `version` is not parsable. If given an already parsed version and requirement this function won't raise.

## Options

- `:allow_pre` (boolean) - when `false`, pre-release versions will not match unless the operand is a pre-release version. Defaults to `true`. For examples, please refer to the table above under the "Requirements" section.

## Examples

    iex> Version.match?("2.0.0", "> 1.0.0")
    true

    iex> Version.match?("2.0.0", "== 1.0.0")
    false

    iex> Version.match?("2.1.6-dev", "~> 2.1.2")
    true

    iex> Version.match?("2.1.6-dev", "~> 2.1.2", allow_pre: false)
    false

    iex> Version.match?("foo", "== 1.0.0")
    ** (Version.InvalidVersionError) invalid version: "foo"

    iex> Version.match?("2.0.0", "== == 1.0.0")
    ** (Version.InvalidRequirementError) invalid requirement: "== == 1.0.0"

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# parse(string)

View Source

    @spec parse(String.t()) :: {:ok, t()} | :error

Parses a version string into a `Version` struct.

## Examples

    iex> Version.parse("2.0.1-alpha1")
    {:ok, %Version{major: 2, minor: 0, patch: 1, pre: ["alpha1"]}}

    iex> Version.parse("2.0-alpha1")
    :error

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# parse!(string)

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    @spec parse!(String.t()) :: t()

Parses a version string into a `Version`.

If `string` is an invalid version, a `Version.InvalidVersionError` is raised.

## Examples

    iex> Version.parse!("2.0.1-alpha1")
    %Version{major: 2, minor: 0, patch: 1, pre: ["alpha1"]}

    iex> Version.parse!("2.0-alpha1")
    ** (Version.InvalidVersionError) invalid version: "2.0-alpha1"

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# parse_requirement(string)

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    @spec parse_requirement(String.t()) :: {:ok, Version.Requirement.t()} | :error

Parses a version requirement string into a `Version.Requirement` struct.

## Examples

    iex> {:ok, requirement} = Version.parse_requirement("== 2.0.1")
    iex> requirement
    Version.parse_requirement!("== 2.0.1")

    iex> Version.parse_requirement("== == 2.0.1")
    :error

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# parse_requirement!(string)

View Source (since 1.8.0)

    @spec parse_requirement!(String.t()) :: Version.Requirement.t()

Parses a version requirement string into a `Version.Requirement` struct.

If `string` is an invalid requirement, a `Version.InvalidRequirementError` is raised.

# Examples

    iex> Version.parse_requirement!("== 2.0.1")
    Version.parse_requirement!("== 2.0.1")

    iex> Version.parse_requirement!("== == 2.0.1")
    ** (Version.InvalidRequirementError) invalid requirement: "== == 2.0.1"

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# to_string(version)

View Source (since 1.14.0)

    @spec to_string(t()) :: String.t()

Converts the given version to a string.

### Examples

    iex> Version.to_string(%Version{major: 1, minor: 2, patch: 3})
    "1.2.3"
    iex> Version.to_string(Version.parse!("1.14.0-rc.0+build0"))
    "1.14.0-rc.0+build0"