class Gem::Platform

# 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

# 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

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

# 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

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

# 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

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

# 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

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

# 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

# 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

# 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

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

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