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?? available_set.rb(3 KB)
?? basic_specification.rb(5.65 KB)
?? command.rb(13.43 KB)
?? command_manager.rb(4.62 KB)
?? commands
?? compatibility.rb(1.67 KB)
?? config_file.rb(12.23 KB)
?? core_ext
?? defaults.rb(3.64 KB)
?? dependency.rb(7.77 KB)
?? dependency_installer.rb(12.64 KB)
?? dependency_list.rb(5.53 KB)
?? deprecate.rb(1.7 KB)
?? doctor.rb(3.04 KB)
?? errors.rb(2.42 KB)
?? exceptions.rb(5.87 KB)
?? ext
?? ext.rb(431 B)
?? gem_runner.rb(1.96 KB)
?? gemcutter_utilities.rb(3.97 KB)
?? indexer.rb(13.03 KB)
?? install_default_message.rb(307 B)
?? install_message.rb(281 B)
?? install_update_options.rb(5.21 KB)
?? installer.rb(21.42 KB)
?? installer_test_case.rb(4.2 KB)
?? local_remote_options.rb(3.36 KB)
?? mock_gem_ui.rb(1.35 KB)
?? name_tuple.rb(2.23 KB)
?? package
?? package.rb(14.25 KB)
?? package_task.rb(3.77 KB)
?? path_support.rb(1.82 KB)
?? platform.rb(6.05 KB)
?? psych_additions.rb(269 B)
?? psych_tree.rb(763 B)
?? rdoc.rb(7.75 KB)
?? remote_fetcher.rb(9.46 KB)
?? request.rb(7.53 KB)
?? request_set
?? request_set.rb(6.94 KB)
?? requirement.rb(6.1 KB)
?? resolver
?? resolver.rb(12.46 KB)
?? safe_yaml.rb(1.11 KB)
?? security
?? security.rb(20.96 KB)
?? server.rb(21.69 KB)
?? source
?? source.rb(4.9 KB)
?? source_list.rb(2.47 KB)
?? source_local.rb(111 B)
?? source_specific_file.rb(93 B)
?? spec_fetcher.rb(6.4 KB)
?? specification.rb(70.8 KB)
?? ssl_certs
?? stub_specification.rb(3.1 KB)
?? syck_hack.rb(2.09 KB)
?? test_case.rb(35.62 KB)
?? test_utilities.rb(8.37 KB)
?? text.rb(1.23 KB)
?? uninstaller.rb(8.69 KB)
?? uri_formatter.rb(762 B)
?? user_interaction.rb(14.4 KB)
?? util
?? util.rb(2.26 KB)
?? validator.rb(4.18 KB)
?? version.rb(10.78 KB)
?? version_option.rb(1.83 KB)

Editing: request_set.rb

require 'rubygems'
require 'tsort'

##
# A RequestSet groups a request to activate a set of dependencies.
#
#   nokogiri = Gem::Dependency.new 'nokogiri', '~> 1.6'
#   pg = Gem::Dependency.new 'pg', '~> 0.14'
#
#   set = Gem::RequestSet.new nokogiri, pg
#
#   requests = set.resolve
#
#   p requests.map { |r| r.full_name }
#   #=> ["nokogiri-1.6.0", "mini_portile-0.5.1", "pg-0.17.0"]

class Gem::RequestSet

include TSort

##
  # Array of gems to install even if already installed

attr_reader :always_install

attr_reader :dependencies

attr_accessor :development

##
  # The set of git gems imported via load_gemdeps.

attr_reader :git_set # :nodoc:

##
  # When true, dependency resolution is not performed, only the requested gems
  # are installed.

attr_accessor :ignore_dependencies

##
  # When false no remote sets are used for resolving gems.

attr_accessor :remote

##
  # Sets used for resolution

attr_reader :sets # :nodoc:

##
  # Treat missing dependencies as silent errors

attr_accessor :soft_missing

##
  # The set of vendor gems imported via load_gemdeps.

attr_reader :vendor_set # :nodoc:

##
  # Creates a RequestSet for a list of Gem::Dependency objects, +deps+.  You
  # can then #resolve and #install the resolved list of dependencies.
  #
  #   nokogiri = Gem::Dependency.new 'nokogiri', '~> 1.6'
  #   pg = Gem::Dependency.new 'pg', '~> 0.14'
  #
  #   set = Gem::RequestSet.new nokogiri, pg

def initialize *deps
    @dependencies = deps

@always_install      = []
    @dependency_names    = {}
    @development         = false
    @git_set             = nil
    @ignore_dependencies = false
    @install_dir         = Gem.dir
    @remote              = true
    @requests            = []
    @sets                = []
    @soft_missing        = false
    @sorted              = nil
    @specs               = nil
    @vendor_set          = nil

yield self if block_given?
  end

##
  # Declare that a gem of name +name+ with +reqs+ requirements is needed.

def gem name, *reqs
    if dep = @dependency_names[name] then
      dep.requirement.concat reqs
    else
      dep = Gem::Dependency.new name, reqs
      @dependency_names[name] = dep
      @dependencies << dep
    end
  end

##
  # Add +deps+ Gem::Dependency objects to the set.

def import deps
    @dependencies.concat deps
  end

##
  # Installs gems for this RequestSet using the Gem::Installer +options+.
  #
  # If a +block+ is given an activation +request+ and +installer+ are yielded.
  # The +installer+ will be +nil+ if a gem matching the request was already
  # installed.

def install options, &block # :yields: request, installer
    if dir = options[:install_dir]
      return install_into dir, false, options, &block
    end

cache_dir = options[:cache_dir] || Gem.dir

specs = []

sorted_requests.each do |req|
      if req.installed? then
        req.spec.spec.build_extensions

if @always_install.none? { |spec| spec == req.spec.spec } then
          yield req, nil if block_given?
          next
        end
      end

path = req.download cache_dir

inst = Gem::Installer.new path, options

yield req, inst if block_given?

specs << inst.install
    end

specs
  end

##
  # Installs from the gem dependencies files in the +:gemdeps+ option in
  # +options+, yielding to the +block+ as in #install.
  #
  # If +:without_groups+ is given in the +options+, those groups in the gem
  # dependencies file are not used.  See Gem::Installer for other +options+.

def install_from_gemdeps options, &block
    gemdeps = options[:gemdeps]

@install_dir = options[:install_dir] || Gem.dir
    @remote      = options[:domain] != :local

load_gemdeps gemdeps, options[:without_groups]

resolve

if options[:explain]
      puts "Gems to install:"

specs.map { |s| s.full_name }.sort.each do |s|
        puts "  #{s}"
      end

if Gem.configuration.really_verbose
        @resolver.stats.display
      end
    else
      installed = install options, &block

lockfile = Gem::RequestSet::Lockfile.new self, gemdeps
      lockfile.write

installed
    end
  end

def install_into dir, force = true, options = {}
    gem_home, ENV['GEM_HOME'] = ENV['GEM_HOME'], dir

existing = force ? [] : specs_in(dir)
    existing.delete_if { |s| @always_install.include? s }

dir = File.expand_path dir

installed = []

options[:install_dir] = dir
    options[:only_install_dir] = true

sorted_requests.each do |request|
      spec = request.spec

if existing.find { |s| s.full_name == spec.full_name } then
        yield request, nil if block_given?
        next
      end

spec.install options do |installer|
        yield request, installer if block_given?
      end

installed << request
    end

installed
  ensure
    ENV['GEM_HOME'] = gem_home
  end

##
  # Load a dependency management file.

def load_gemdeps path, without_groups = []
    @git_set    = Gem::Resolver::GitSet.new
    @vendor_set = Gem::Resolver::VendorSet.new

@git_set.root_dir = @install_dir

lockfile = Gem::RequestSet::Lockfile.new self, path
    lockfile.parse

gf = Gem::RequestSet::GemDependencyAPI.new self, path
    gf.without_groups = without_groups if without_groups
    gf.load
  end

##
  # Resolve the requested dependencies and return an Array of Specification
  # objects to be activated.

def resolve set = Gem::Resolver::BestSet.new
    @sets << set
    @sets << @git_set
    @sets << @vendor_set

set = Gem::Resolver.compose_sets(*@sets)
    set.remote = @remote

resolver = Gem::Resolver.new @dependencies, set
    resolver.development         = @development
    resolver.ignore_dependencies = @ignore_dependencies
    resolver.soft_missing        = @soft_missing

@resolver = resolver

@requests = resolver.resolve
  end

##
  # Resolve the requested dependencies against the gems available via Gem.path
  # and return an Array of Specification objects to be activated.

def resolve_current
    resolve Gem::Resolver::CurrentSet.new
  end

def sorted_requests
    @sorted ||= strongly_connected_components.flatten
  end

def specs
    @specs ||= @requests.map { |r| r.full_spec }
  end

def specs_in dir
    Dir["#{dir}/specifications/*.gemspec"].map do |g|
      Gem::Specification.load g
    end
  end

def tsort_each_node &block # :nodoc:
    @requests.each(&block)
  end

def tsort_each_child node # :nodoc:
    node.spec.dependencies.each do |dep|
      next if dep.type == :development and not @development

match = @requests.find { |r| dep.match? r.spec.name, r.spec.version }
      if match
        begin
          yield match
        rescue TSort::Cyclic
        end
      else
        unless @soft_missing
          raise Gem::DependencyError, "Unresolved dependency found during sorting - #{dep} (requested by #{node.spec.full_name})"
        end
      end
    end
  end

end

require 'rubygems/request_set/gem_dependency_api'
require 'rubygems/request_set/lockfile'

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