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##
# The Dependency class holds a Gem name and a Gem::Requirement.

require "rubygems/requirement"

class Gem::Dependency

  ##
  # Valid dependency types.
  #--
  # When this list is updated, be sure to change
  # Gem::Specification::CURRENT_SPECIFICATION_VERSION as well.
  #
  # REFACTOR: This type of constant, TYPES, indicates we might want
  # two classes, used via inheritance or duck typing.

  TYPES = [
    :development,
    :runtime,
  ]

  ##
  # Dependency name or regular expression.

  attr_accessor :name

  ##
  # Allows you to force this dependency to be a prerelease.

  attr_writer :prerelease

  ##
  # Constructs a dependency with +name+ and +requirements+. The last
  # argument can optionally be the dependency type, which defaults to
  # <tt>:runtime</tt>.

  def initialize name, *requirements
    case name
    when String then # ok
    when Regexp then
      msg = ["NOTE: Dependency.new w/ a regexp is deprecated.",
             "Dependency.new called from #{Gem.location_of_caller.join(":")}"]
      warn msg.join("\n") unless Gem::Deprecate.skip
    else
      raise ArgumentError,
            "dependency name must be a String, was #{name.inspect}"
    end

    type         = Symbol === requirements.last ? requirements.pop : :runtime
    requirements = requirements.first if 1 == requirements.length # unpack

    unless TYPES.include? type
      raise ArgumentError, "Valid types are #{TYPES.inspect}, " +
                           "not #{type.inspect}"
    end

    @name        = name
    @requirement = Gem::Requirement.create requirements
    @type        = type
    @prerelease  = false

    # This is for Marshal backwards compatibility. See the comments in
    # +requirement+ for the dirty details.

    @version_requirements = @requirement
  end

  ##
  # A dependency's hash is the XOR of the hashes of +name+, +type+,
  # and +requirement+.

  def hash # :nodoc:
    name.hash ^ type.hash ^ requirement.hash
  end

  def inspect # :nodoc:
    if @prerelease
      "<%s type=%p name=%p requirements=%p prerelease=ok>" %
        [self.class, self.type, self.name, requirement.to_s]
    else
      "<%s type=%p name=%p requirements=%p>" %
        [self.class, self.type, self.name, requirement.to_s]
    end
  end

  ##
  # Does this dependency require a prerelease?

  def prerelease?
    @prerelease || requirement.prerelease?
  end

  ##
  # Is this dependency simply asking for the latest version
  # of a gem?

  def latest_version?
    @requirement.none?
  end

  def pretty_print q # :nodoc:
    q.group 1, 'Gem::Dependency.new(', ')' do
      q.pp name
      q.text ','
      q.breakable

      q.pp requirement

      q.text ','
      q.breakable

      q.pp type
    end
  end

  ##
  # What does this dependency require?

  def requirement
    return @requirement if defined?(@requirement) and @requirement

    # @version_requirements and @version_requirement are legacy ivar
    # names, and supported here because older gems need to keep
    # working and Dependency doesn't implement marshal_dump and
    # marshal_load. In a happier world, this would be an
    # attr_accessor. The horrifying instance_variable_get you see
    # below is also the legacy of some old restructurings.
    #
    # Note also that because of backwards compatibility (loading new
    # gems in an old RubyGems installation), we can't add explicit
    # marshaling to this class until we want to make a big
    # break. Maybe 2.0.
    #
    # Children, define explicit marshal and unmarshal behavior for
    # public classes. Marshal formats are part of your public API.

    # REFACTOR: See above

    if defined?(@version_requirement) && @version_requirement
      version = @version_requirement.instance_variable_get :@version
      @version_requirement  = nil
      @version_requirements = Gem::Requirement.new version
    end

    @requirement = @version_requirements if defined?(@version_requirements)
  end

  # DOC: this method needs documentation or :nodoc''d
  def requirements_list
    requirement.as_list
  end

  def to_s # :nodoc:
    if type != :runtime then
      "#{name} (#{requirement}, #{type})"
    else
      "#{name} (#{requirement})"
    end
  end

  ##
  # Dependency type.

  def type
    @type ||= :runtime
  end

  def == other # :nodoc:
    Gem::Dependency === other &&
      self.name        == other.name &&
      self.type        == other.type &&
      self.requirement == other.requirement
  end

  ##
  # Dependencies are ordered by name.

  def <=> other
    self.name <=> other.name
  end

  ##
  # Uses this dependency as a pattern to compare to +other+. This
  # dependency will match if the name matches the other's name, and
  # other has only an equal version requirement that satisfies this
  # dependency.

  def =~ other
    unless Gem::Dependency === other
      return unless other.respond_to?(:name) && other.respond_to?(:version)
      other = Gem::Dependency.new other.name, other.version
    end

    return false unless name === other.name

    reqs = other.requirement.requirements

    return false unless reqs.length == 1
    return false unless reqs.first.first == '='

    version = reqs.first.last

    requirement.satisfied_by? version
  end

  # DOC: this method needs either documented or :nodoc'd

  def match? obj, version=nil
    if !version
      name = obj.name
      version = obj.version
    else
      name = obj
    end

    return false unless self.name === name
    return true if requirement.none?

    requirement.satisfied_by? Gem::Version.new(version)
  end

  # DOC: this method needs either documented or :nodoc'd

  def matches_spec? spec
    return false unless name === spec.name
    return true  if requirement.none?

    requirement.satisfied_by?(spec.version)
  end

  ##
  # Merges the requirements of +other+ into this dependency

  def merge other
    unless name == other.name then
      raise ArgumentError,
            "#{self} and #{other} have different names"
    end

    default = Gem::Requirement.default
    self_req  = self.requirement
    other_req = other.requirement

    return self.class.new name, self_req  if other_req == default
    return self.class.new name, other_req if self_req  == default

    self.class.new name, self_req.as_list.concat(other_req.as_list)
  end

  # DOC: this method needs either documented or :nodoc'd

  def matching_specs platform_only = false
    matches = Gem::Specification.find_all { |spec|
      self.name === spec.name and # TODO: == instead of ===
        requirement.satisfied_by? spec.version
    }

    if platform_only
      matches.reject! { |spec|
        not Gem::Platform.match spec.platform
      }
    end

    matches = matches.sort_by { |s| s.sort_obj } # HACK: shouldn't be needed
  end

  ##
  # True if the dependency will not always match the latest version.

  def specific?
    @requirement.specific?
  end

  # DOC: this method needs either documented or :nodoc'd

  def to_specs
    matches = matching_specs true

    # TODO: check Gem.activated_spec[self.name] in case matches falls outside

    if matches.empty? then
      specs = Gem::Specification.find_all { |s|
                s.name == name
              }.map { |x| x.full_name }

      if specs.empty?
        total = Gem::Specification.to_a.size
        error = Gem::LoadError.new \
          "Could not find '#{name}' (#{requirement}) among #{total} total gem(s)"
      else
        error = Gem::LoadError.new \
          "Could not find '#{name}' (#{requirement}) - did find: [#{specs.join ','}]"
      end
      error.name        = self.name
      error.requirement = self.requirement
      raise error
    end

    # TODO: any other resolver validations should go here

    matches
  end

  # DOC: this method needs either documented or :nodoc'd

  def to_spec
    matches = self.to_specs

    matches.find { |spec| spec.activated? } or matches.last
  end
end

Filemanager

DIR : / usr/ share/ rubygems/ rubygems/
Name Type Size Permission Actions
commands Folder 0755
core_ext Folder 0755
defaults Folder 0755
ext Folder 0755
package Folder 0755
security Folder 0755
ssl_certs Folder 0755
LICENSE.txt File 2.27 KB 0644
available_set.rb File 1.56 KB 0644
command.rb File 13.43 KB 0644
command_manager.rb File 5.36 KB 0644
compatibility.rb File 1.58 KB 0644
config_file.rb File 11.82 KB 0644
defaults.rb File 3.06 KB 0644
dependency.rb File 7.74 KB 0644
dependency_installer.rb File 12.12 KB 0644
dependency_list.rb File 5.53 KB 0644
dependency_resolver.rb File 14.97 KB 0644
deprecate.rb File 1.73 KB 0644
doctor.rb File 2.86 KB 0644
errors.rb File 2.14 KB 0644
exceptions.rb File 2.7 KB 0644
ext.rb File 416 B 0644
gem_runner.rb File 1.98 KB 0644
gemcutter_utilities.rb File 2.91 KB 0644
indexer.rb File 12.89 KB 0644
install_message.rb File 281 B 0644
install_update_options.rb File 5.09 KB 0644
installer.rb File 23.04 KB 0644
installer_test_case.rb File 4.28 KB 0644
local_remote_options.rb File 3.36 KB 0644
mock_gem_ui.rb File 1.35 KB 0644
name_tuple.rb File 1.96 KB 0644
package.rb File 14.38 KB 0644
package_task.rb File 3.77 KB 0644
path_support.rb File 1.58 KB 0644
platform.rb File 5.63 KB 0644
psych_additions.rb File 249 B 0644
psych_tree.rb File 763 B 0644
rdoc.rb File 7.72 KB 0644
remote_fetcher.rb File 15.69 KB 0644
request_set.rb File 3.67 KB 0644
requirement.rb File 6.02 KB 0644
safe_yaml.rb File 1.11 KB 0644
security.rb File 20.56 KB 0644
server.rb File 22.03 KB 0644
source.rb File 3.12 KB 0644
source_list.rb File 1.22 KB 0644
source_local.rb File 1.88 KB 0644
source_specific_file.rb File 552 B 0644
spec_fetcher.rb File 5.17 KB 0644
specification.rb File 68.24 KB 0644
syck_hack.rb File 2.07 KB 0644
test_case.rb File 28.09 KB 0644
test_utilities.rb File 4.03 KB 0644
text.rb File 1.72 KB 0644
uninstaller.rb File 8.32 KB 0644
user_interaction.rb File 11.68 KB 0644
validator.rb File 4.08 KB 0644
version.rb File 10.5 KB 0644
version_option.rb File 1.59 KB 0644