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rubygems_ext.rb

# frozen_string_literal: true

require "pathname"

if defined?(Gem::QuickLoader)
  # Gem Prelude makes me a sad panda :'(
  Gem::QuickLoader.load_full_rubygems_library
end

require "rubygems"
require "rubygems/specification"

begin
  # Possible use in Gem::Specification#source below and require
  # shouldn't be deferred.
  require "rubygems/source"
rescue LoadError
  # Not available before RubyGems 2.0.0, ignore
  nil
end

require "bundler/match_platform"

module Gem
  @loaded_stacks = Hash.new {|h, k| h[k] = [] }

class Specification
    attr_accessor :remote, :location, :relative_loaded_from

if instance_methods(false).map(&:to_sym).include?(:source)
      remove_method :source
      attr_writer :source
      def source
        (defined?(@source) && @source) || Gem::Source::Installed.new
      end
    else
      attr_accessor :source
    end

alias_method :rg_full_gem_path, :full_gem_path
    alias_method :rg_loaded_from,   :loaded_from

attr_writer :full_gem_path unless instance_methods.include?(:full_gem_path=)

def full_gem_path
      # this cannot check source.is_a?(Bundler::Plugin::API::Source)
      # because that _could_ trip the autoload, and if there are unresolved
      # gems at that time, this method could be called inside another require,
      # thus raising with that constant being undefined. Better to check a method
      if source.respond_to?(:path) || (source.respond_to?(:bundler_plugin_api_source?) && source.bundler_plugin_api_source?)
        Pathname.new(loaded_from).dirname.expand_path(source.root).to_s.untaint
      else
        rg_full_gem_path
      end
    end

def loaded_from
      if relative_loaded_from
        source.path.join(relative_loaded_from).to_s
      else
        rg_loaded_from
      end
    end

def load_paths
      return full_require_paths if respond_to?(:full_require_paths)

require_paths.map do |require_path|
        if require_path.include?(full_gem_path)
          require_path
        else
          File.join(full_gem_path, require_path)
        end
      end
    end

if method_defined?(:extension_dir)
      alias_method :rg_extension_dir, :extension_dir
      def extension_dir
        @bundler_extension_dir ||= if source.respond_to?(:extension_dir_name)
          File.expand_path(File.join(extensions_dir, source.extension_dir_name))
        else
          rg_extension_dir
        end
      end
    end

# RubyGems 1.8+ used only.
    methods = instance_methods(false)
    gem_dir = methods.first.is_a?(String) ? "gem_dir" : :gem_dir
    remove_method :gem_dir if methods.include?(gem_dir)
    def gem_dir
      full_gem_path
    end

def groups
      @groups ||= []
    end

def git_version
      return unless loaded_from && source.is_a?(Bundler::Source::Git)
      " #{source.revision[0..6]}"
    end

def to_gemfile(path = nil)
      gemfile = String.new("source 'https://rubygems.org'\n")
      gemfile << dependencies_to_gemfile(nondevelopment_dependencies)
      unless development_dependencies.empty?
        gemfile << "\n"
        gemfile << dependencies_to_gemfile(development_dependencies, :development)
      end
      gemfile
    end

def nondevelopment_dependencies
      dependencies - development_dependencies
    end

private

def dependencies_to_gemfile(dependencies, group = nil)
      gemfile = String.new
      if dependencies.any?
        gemfile << "group :#{group} do\n" if group
        dependencies.each do |dependency|
          gemfile << "  " if group
          gemfile << %(gem "#{dependency.name}")
          req = dependency.requirements_list.first
          gemfile << %(, "#{req}") if req
          gemfile << "\n"
        end
        gemfile << "end\n" if group
      end
      gemfile
    end
  end

class Dependency
    attr_accessor :source, :groups, :all_sources

alias_method :eql?, :==

def encode_with(coder)
      to_yaml_properties.each do |ivar|
        coder[ivar.to_s.sub(/^@/, "")] = instance_variable_get(ivar)
      end
    end

def to_yaml_properties
      instance_variables.reject {|p| ["@source", "@groups", "@all_sources"].include?(p.to_s) }
    end

def to_lock
      out = String.new("  #{name}")
      unless requirement.none?
        reqs = requirement.requirements.map {|o, v| "#{o} #{v}" }.sort.reverse
        out << " (#{reqs.join(", ")})"
      end
      out
    end

# Backport of performance enhancement added to RubyGems 1.4
    def matches_spec?(spec)
      # name can be a Regexp, so use ===
      return false unless name === spec.name
      return true  if requirement.none?

requirement.satisfied_by?(spec.version)
    end unless allocate.respond_to?(:matches_spec?)
  end

class Requirement
    # Backport of performance enhancement added to RubyGems 1.4
    def none?
      # note that it might be tempting to replace with with RubyGems 2.0's
      # improved implementation. Don't. It requires `DefaultRequirement` to be
      # defined, and more importantantly, these overrides are not used when the
      # running RubyGems defines these methods
      to_s == ">= 0"
    end unless allocate.respond_to?(:none?)

# Backport of performance enhancement added to RubyGems 2.2
    def exact?
      return false unless @requirements.size == 1
      @requirements[0][0] == "="
    end unless allocate.respond_to?(:exact?)
  end

class Platform
    JAVA  = Gem::Platform.new("java") unless defined?(JAVA)
    MSWIN = Gem::Platform.new("mswin32") unless defined?(MSWIN)
    MSWIN64 = Gem::Platform.new("mswin64") unless defined?(MSWIN64)
    MINGW = Gem::Platform.new("x86-mingw32") unless defined?(MINGW)
    X64_MINGW = Gem::Platform.new("x64-mingw32") unless defined?(X64_MINGW)

undef_method :hash if method_defined? :hash
    def hash
      @cpu.hash ^ @os.hash ^ @version.hash
    end

undef_method :eql? if method_defined? :eql?
    alias_method :eql?, :==
  end
end

module Gem
  class Specification
    include ::Bundler::MatchPlatform
  end
end

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