# class Gem::Platform

Available list of platforms for targeting `Gem` installations.

See ‘gem help platform` for information on platform matching.

### Constants

CURRENT

  A platform-specific gem that is built for the packaging Ruby’s platform. This will be replaced with `Gem::Platform::local`.

RUBY

  A pure-Ruby gem that may use `Gem::Specification#extensions` to build binary files.

### Attributes

cpu [RW]
os [RW]
version [RW]

### Public Class Methods

installable? (spec)
Source

    # File lib/rubygems/platform.rb, line 67
    def self.installable?(spec)
      if spec.respond_to? :installable_platform?
        spec.installable_platform?
      else
        match_spec? spec
      end
    end

local (refresh: false)
Source

    # File lib/rubygems/platform.rb, line 15
    def self.local(refresh: false)
      return @local if @local && !refresh
      @local = begin
        arch = Gem.target_rbconfig["arch"]
        arch = "#{arch}_60" if /mswin(?:32|64)$/.match?(arch)
        new(arch)
      end
    end

match (platform)
Source

    # File lib/rubygems/platform.rb, line 24
    def self.match(platform)
      match_platforms?(platform, Gem.platforms)
    end

match_gem? (platform, gem_name)
Source

    # File lib/rubygems/platform.rb, line 48
    def self.match_gem?(platform, gem_name)
      raise "Not a string: #{gem_name.inspect}" unless String === gem_name

      if REUSE_AS_BINARY_ON_TRUFFLERUBY.include?(gem_name)
        match_platforms?(platform, [Gem::Platform::RUBY, Gem::Platform.local])
      else
        match_platforms?(platform, Gem.platforms)
      end
    end

match_spec? (spec)
Source

    # File lib/rubygems/platform.rb, line 43
    def self.match_spec?(spec)
      match_gem?(spec.platform, spec.name)
    end

new (arch)
Source

    # File lib/rubygems/platform.rb, line 86
    def initialize(arch)
      case arch
      when Array then
        @cpu, @os, @version = arch
      when String then
        arch = arch.split "-"

        if arch.length > 2 && !arch.last.match?(/\d+(\.\d+)?$/) # reassemble x86-linux-{libc}
          extra = arch.pop
          arch.last << "-#{extra}"
        end

        cpu = arch.shift

        @cpu = case cpu
               when /i\d86/ then "x86"
               else cpu
        end

        if arch.length == 2 && arch.last.match?(/^\d+(\.\d+)?$/) # for command-line
          @os, @version = arch
          return
        end

        os, = arch
        if os.nil?
          @cpu = nil
          os = cpu
        end # legacy jruby

        @os, @version = case os
                        when /aix(\d+)?/ then             ["aix",       $1]
                        when /cygwin/ then                ["cygwin",    nil]
                        when /darwin(\d+)?/ then          ["darwin",    $1]
                        when /^macruby$/ then             ["macruby",   nil]
                        when /freebsd(\d+)?/ then         ["freebsd",   $1]
                        when /^java$/, /^jruby$/ then     ["java",      nil]
                        when /^java([\d.]*)/ then         ["java",      $1]
                        when /^dalvik(\d+)?$/ then        ["dalvik",    $1]
                        when /^dotnet$/ then              ["dotnet",    nil]
                        when /^dotnet([\d.]*)/ then       ["dotnet",    $1]
                        when /linux-?(\w+)?/ then         ["linux",     $1]
                        when /mingw32/ then               ["mingw32",   nil]
                        when /mingw-?(\w+)?/ then         ["mingw",     $1]
                        when /(mswin\d+)(\_(\d+))?/ then
                          os = $1
                          version = $3
                          @cpu = "x86" if @cpu.nil? && os =~ /32$/
                          [os, version]
                        when /netbsdelf/ then             ["netbsdelf", nil]
                        when /openbsd(\d+\.\d+)?/ then    ["openbsd",   $1]
                        when /solaris(\d+\.\d+)?/ then    ["solaris",   $1]
                        when /wasi/ then                  ["wasi",      nil]
                        # test
                        when /^(\w+_platform)(\d+)?/ then [$1,          $2]
                        else ["unknown", nil]
        end
      when Gem::Platform then
        @cpu = arch.cpu
        @os = arch.os
        @version = arch.version
      else
        raise ArgumentError, "invalid argument #{arch.inspect}"
      end
    end

sort_priority (platform)
Source

    # File lib/rubygems/platform.rb, line 63
    def self.sort_priority(platform)
      platform == Gem::Platform::RUBY ? -1 : 1
    end

### Private Class Methods

match_platforms? (platform, platforms)
Source

    # File lib/rubygems/platform.rb, line 33
    def self.match_platforms?(platform, platforms)
      platform = Gem::Platform.new(platform) unless platform.is_a?(Gem::Platform)
      platforms.any? do |local_platform|
        platform.nil? ||
          local_platform == platform ||
          (local_platform != Gem::Platform::RUBY && platform =~ local_platform)
      end
    end

### Public Instance Methods

== (other)
Source

    # File lib/rubygems/platform.rb, line 164
    def ==(other)
      self.class === other && to_a == other.to_a
    end

Is `other` equal to this platform? Two platforms are equal if they have the same CPU, OS and version.

Also aliased as: eql?
=== (other)
Source

    # File lib/rubygems/platform.rb, line 192
    def ===(other)
      return nil unless Gem::Platform === other

      # universal-mingw32 matches x64-mingw-ucrt
      return true if (@cpu == "universal" || other.cpu == "universal") &&
                     @os.start_with?("mingw") && other.os.start_with?("mingw")

      # cpu
      ([nil,"universal"].include?(@cpu) || [nil, "universal"].include?(other.cpu) || @cpu == other.cpu ||
      (@cpu == "arm" && other.cpu.start_with?("armv"))) &&

        # os
        @os == other.os &&

        # version
        (
          (@os != "linux" && (@version.nil? || other.version.nil?)) ||
          (@os == "linux" && (normalized_linux_version == other.normalized_linux_version || ["musl#{@version}", "musleabi#{@version}", "musleabihf#{@version}"].include?(other.version))) ||
          @version == other.version
        )
    end

Does `other` match this platform? Two platforms match if they have the same CPU, or either has a CPU of ‘universal’, they have the same OS, and they have the same version, or either one has no version

Additionally, the platform will match if the local CPU is ‘arm’ and the other CPU starts with “armv” (for generic 32-bit ARM family support).

Of note, this method is not commutative. Indeed the OS ‘linux’ has a special case: the version is the libc name, yet while “no version” stands as a wildcard for a binary gem platform (as for other OSes), for the runtime platform “no version” stands for ‘gnu’. To be able to distinguish these, the method receiver is the gem platform, while the argument is the runtime platform.

=~ (other)
Source

    # File lib/rubygems/platform.rb, line 230
    def =~(other)
      case other
      when Gem::Platform then # nop
      when String then
        # This data is from http://gems.rubyforge.org/gems/yaml on 19 Aug 2007
        other = case other
                when /^i686-darwin(\d)/     then ["x86",       "darwin",  $1]
                when /^i\d86-linux/         then ["x86",       "linux",   nil]
                when "java", "jruby"        then [nil,         "java",    nil]
                when /^dalvik(\d+)?$/       then [nil,         "dalvik",  $1]
                when /dotnet(\-(\d+\.\d+))?/ then ["universal","dotnet",  $2]
                when /mswin32(\_(\d+))?/    then ["x86",       "mswin32", $2]
                when /mswin64(\_(\d+))?/    then ["x64",       "mswin64", $2]
                when "powerpc-darwin"       then ["powerpc",   "darwin",  nil]
                when /powerpc-darwin(\d)/   then ["powerpc",   "darwin",  $1]
                when /sparc-solaris2.8/     then ["sparc",     "solaris", "2.8"]
                when /universal-darwin(\d)/ then ["universal", "darwin",  $1]
                else other
        end

        other = Gem::Platform.new other
      else
        return nil
      end

      self === other
    end

Does `other` match this platform? If `other` is a `String` it will be converted to a `Gem::Platform` first. See `===` for matching rules.

eql? (other)
Alias for: ==
normalized_linux_version ()
Source

    # File lib/rubygems/platform.rb, line 217
    def normalized_linux_version
      return nil unless @version

      without_gnu_nor_abi_modifiers = @version.sub(/\Agnu/, "").sub(/eabi(hf)?\Z/, "")
      return nil if without_gnu_nor_abi_modifiers.empty?

      without_gnu_nor_abi_modifiers
    end

to_a ()
Source

    # File lib/rubygems/platform.rb, line 152
    def to_a
      [@cpu, @os, @version]
    end

to_s ()
Source

    # File lib/rubygems/platform.rb, line 156
    def to_s
      to_a.compact.join "-"
    end