# 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) click to toggle source

    # File lib/rubygems/platform.rb, line 49
    def self.installable?(spec)
      if spec.respond_to? :installable_platform?
        spec.installable_platform?
      else
        match_spec? spec
      end
    end

local() click to toggle source

    # File lib/rubygems/platform.rb, line 15
    def self.local
      arch = RbConfig::CONFIG["arch"]
      arch = "#{arch}_60" if arch =~ /mswin(?:32|64)$/
      @local ||= new(arch)
    end

match(platform) click to toggle source

    # File lib/rubygems/platform.rb, line 21
    def self.match(platform)
      match_platforms?(platform, Gem.platforms)
    end

match_gem?(platform, gem_name) click to toggle source

    # File lib/rubygems/platform.rb, line 39
    def self.match_gem?(platform, gem_name)
      # Note: this method might be redefined by Ruby implementations to
      # customize behavior per RUBY_ENGINE, gem_name or other criteria.
      match_platforms?(platform, Gem.platforms)
    end

match_spec?(spec) click to toggle source

    # File lib/rubygems/platform.rb, line 35
    def self.match_spec?(spec)
      match_gem?(spec.platform, spec.name)
    end

new(arch) click to toggle source

    # File lib/rubygems/platform.rb, line 68
    def initialize(arch)
      case arch
      when Array then
        @cpu, @os, @version = arch
      when String then
        arch = arch.split "-"

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

        os, = arch
        @cpu, os = nil, cpu if os.nil? # 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, version = $1, $3
          @cpu = "x86" if @cpu.nil? && os =~ /32$/
          [os, version]
        when /netbsdelf/ then             [ "netbsdelf", nil ]
        when /openbsd(\d+\.\d+)?/ then    [ "openbsd",   $1  ]
        when /solaris(\d+\.\d+)?/ then    [ "solaris",   $1  ]
        # 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) click to toggle source

    # File lib/rubygems/platform.rb, line 45
    def self.sort_priority(platform)
      platform == Gem::Platform::RUBY ? -1 : 1
    end

### Private Class Methods

match_platforms?(platform, platforms) click to toggle source

    # File lib/rubygems/platform.rb, line 25
    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) click to toggle source

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

    # File lib/rubygems/platform.rb, line 141
    def ==(other)
      self.class === other && to_a == other.to_a
    end

Also aliased as: eql?
===(other) click to toggle source

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 “arm” (for generic 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.

    # File lib/rubygems/platform.rb, line 169
    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?("arm"))) &&

        # 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

=~(other) click to toggle source

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

    # File lib/rubygems/platform.rb, line 207
    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

eql?(other)
Alias for: ==
normalized_linux_version() click to toggle source

    # File lib/rubygems/platform.rb, line 194
    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() click to toggle source

    # File lib/rubygems/platform.rb, line 129
    def to_a
      [@cpu, @os, @version]
    end

to_s() click to toggle source

    # File lib/rubygems/platform.rb, line 133
    def to_s
      to_a.compact.join "-"
    end