Gem::Platform.new

# File tmp/rubies/ruby-4.0.0/lib/rubygems/platform.rb, line 75
def initialize(arch)
  case arch
  when Array then
    @cpu, @os, @version = arch
  when String then
    cpu, os = arch.sub(/-+$/, "").split("-", 2)

    @cpu = if cpu&.match?(/i\d86/)
      "x86"
    else
      cpu
    end

    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 /^macruby-?(\d+(?:\.\d+)*)?/ then ["macruby", $1]
                    when /freebsd-?(\d+)?/ then            ["freebsd", $1]
                    when "java", "jruby" then              ["java",    nil]
                    when /^java-?(\d+(?:\.\d+)*)?/ then    ["java",    $1]
                    when /^dalvik-?(\d+)?$/ then           ["dalvik",  $1]
                    when /^dotnet$/ then                   ["dotnet",  nil]
                    when /^dotnet-?(\d+(?:\.\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 = $2
                      @cpu = "x86" if @cpu.nil? && os.end_with?("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