# File lib/rubygems/resolver/specification.rb, line 60
def initialize
  @dependencies = nil
  @name         = nil
  @platform     = nil
  @set          = nil
  @source       = nil
  @version      = nil
  @required_ruby_version = Gem::Requirement.default
  @required_rubygems_version = Gem::Requirement.default
end

为规范设置默认实例变量。

公共实例方法

download (options)

源

# File lib/rubygems/resolver/specification.rb, line 108
def download(options)
  dir = options[:install_dir] || Gem.dir

  Gem.ensure_gem_subdirectories dir

  source.download spec, dir
end

full_name ()

源

# File lib/rubygems/resolver/specification.rb, line 83
def full_name
  "#{@name}-#{@version}"
end

规范的名称和版本。

与 Gem::Specification#full_name 不同，不包含平台。

install (options = {}) { |installer| ... }

源

# File lib/rubygems/resolver/specification.rb, line 96
def install(options = {})
  require_relative "../installer"

  gem = download options

  installer = Gem::Installer.at gem, options

  yield installer if block_given?

  @spec = installer.install
end

使用 Gem::Installer options 安装此规范。install 方法会产生一个 Gem::Installer 实例，表示将要安装该 gem；或者产生 nil，表示该 gem 已安装。

安装后，spec 会被更新以指向刚刚安装的规范。

installable_platform? ()

源

# File lib/rubygems/resolver/specification.rb, line 119
def installable_platform?
  Gem::Platform.match_spec? spec
end

如果此规范可在此平台上安装，则返回 true。