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Showing content from https://docs.ruby-lang.org/en/3.4/Gem/Specification.html below:

class Gem::Specification - Documentation for Ruby 3.4

1. Gem::
2. Specification

The Specification class contains the information for a gem. Typically defined in a .gemspec file or a Rakefile, and looks like this:

Gem::Specification.new do |s|
  s.name        = 'example'
  s.version     = '0.1.0'
  s.licenses    = ['MIT']
  s.summary     = "This is an example!"
  s.description = "Much longer explanation of the example!"
  s.authors     = ["Ruby Coder"]
  s.email       = 'rubycoder@example.com'
  s.files       = ["lib/example.rb"]
  s.homepage    = 'https://rubygems.org/gems/example'
  s.metadata    = { "source_code_uri" => "https://github.com/example/example" }
end

Starting in RubyGems 2.0, a Specification can hold arbitrary metadata. See metadata for restrictions on the format and size of metadata items you may add to a specification.

NONEXISTENT_SPECIFICATION_VERSION

The version number of a specification that does not specify one (i.e. RubyGems 0.7 or earlier).

def removed_method_calls
  @removed_method_calls ||= []
end

LATEST_RUBY_WITHOUT_PATCH_VERSIONS

The path in the gem for executable scripts. Usually ‘exe’

Usage:

spec.bindir = 'exe'

The certificate chain used to sign this gem. See Gem::Security for details.

A message that gets displayed after the gem is installed.

Usage:

spec.post_install_message = "Thanks for installing!"

The RubyGems version required by this gem

def add_dependency(gem, *requirements)
  if requirements.uniq.size != requirements.size
    warn "WARNING: duplicated #{gem} dependency #{requirements}"
  end

  add_dependency_with_type(gem, :runtime, requirements)
end

Adds a runtime dependency named gem with requirements to this gem.

Usage:

spec.add_dependency 'example', '~> 1.1', '>= 1.1.4'

def add_development_dependency(gem, *requirements)
  add_dependency_with_type(gem, :development, requirements)
end

Adds a development dependency named gem with requirements to this gem.

Usage:

spec.add_development_dependency 'example', '~> 1.1', '>= 1.1.4'

Development dependencies aren’t installed by default and aren’t activated when a gem is required.

Singular (alternative) writer for authors

Usage:

spec.author = 'John Jones'

def executables
  @executables ||= []
end

Executables included in the gem.

For example, the rake gem has rake as an executable. You don’t specify the full path (as in bin/rake); all application-style files are expected to be found in bindir. These files must be executable Ruby files. Files that use bash or other interpreters will not work.

Executables included may only be ruby scripts, not scripts for other languages or compiled binaries.

Usage:

spec.executables << 'rake'

def extensions
  @extensions ||= []
end

Extensions to build when installing the gem, specifically the paths to extconf.rb-style files used to compile extensions.

These files will be run when the gem is installed, causing the C (or whatever) code to be compiled on the user’s machine.

Usage:

spec.extensions << 'ext/rmagic/extconf.rb'

See Gem::Ext::Builder for information about writing extensions for gems.

def platform=(platform)
  @original_platform = platform

  case platform
  when Gem::Platform::CURRENT then
    @new_platform = Gem::Platform.local
    @original_platform = @new_platform.to_s

  when Gem::Platform then
    @new_platform = platform

  
  when nil, Gem::Platform::RUBY then
    @new_platform = Gem::Platform::RUBY
  when "mswin32" then 
    @new_platform = Gem::Platform.new "x86-mswin32"
  when "i586-linux" then 
    @new_platform = Gem::Platform.new "x86-linux"
  when "powerpc-darwin" then 
    @new_platform = Gem::Platform.new "ppc-darwin"
  else
    @new_platform = Gem::Platform.new platform
  end

  @platform = @new_platform.to_s

  invalidate_memoized_attributes
end

The platform this gem runs on.

This is usually Gem::Platform::RUBY or Gem::Platform::CURRENT.

Most gems contain pure Ruby code; they should simply leave the default value in place. Some gems contain C (or other) code to be compiled into a Ruby “extension”. The gem should leave the default value in place unless the code will only compile on a certain type of system. Some gems consist of pre-compiled code (“binary gems”). It’s especially important that they set the platform attribute appropriately. A shortcut is to set the platform to Gem::Platform::CURRENT, which will cause the gem builder to set the platform to the appropriate value for the system on which the build is being performed.

If this attribute is set to a non-default value, it will be included in the filename of the gem when it is built such as: nokogiri-1.6.0-x86-mingw32.gem

Usage:

spec.platform = Gem::Platform.local

def rdoc_options
  @rdoc_options ||= []
end

Specifies the rdoc options to be used when generating API documentation.

Usage:

spec.rdoc_options << '--title' << 'Rake -- Ruby Make' <<
  '--main' << 'README' <<
  '--line-numbers'

def require_paths=(val)
  @require_paths = Array(val)
end

Paths in the gem to add to $LOAD_PATH when this gem is activated. If you have an extension you do not need to add "ext" to the require path, the extension build process will copy the extension files into “lib” for you.

The default value is "lib"

Usage:

spec.require_paths = ['.']

def required_ruby_version=(req)
  @required_ruby_version = Gem::Requirement.create req

  @required_ruby_version.requirements.map! do |op, v|
    if v >= LATEST_RUBY_WITHOUT_PATCH_VERSIONS && v.release.segments.size == 4
      [op == "~>" ? "=" : op, Gem::Version.new(v.segments.tap {|s| s.delete_at(3) }.join("."))]
    else
      [op, v]
    end
  end
end

The version of Ruby required by this gem. The ruby version can be specified to the patch-level:

$ ruby -v -e 'p Gem.ruby_version'
ruby 2.0.0p247 (2013-06-27 revision 41674) [x86_64-darwin12.4.0]
#<Gem::Version "2.0.0.247">

Prereleases can also be specified.

Usage:

spec.required_ruby_version = '>= 1.8.6'


spec.required_ruby_version = '~> 2.3'


spec.required_ruby_version = '> 2.6.0.preview2'


spec.required_ruby_version = '>= 2.3', '< 4'

def required_rubygems_version=(req)
  @required_rubygems_version = Gem::Requirement.create req
end

The RubyGems version required by this gem

def requirements
  @requirements ||= []
end

Lists the external (to RubyGems) requirements that must be met for this gem to work. It’s simply information for the user.

Usage:

spec.requirements << 'libmagick, v6.0'
spec.requirements << 'A good graphics card'

The version of RubyGems used to create this gem.

def extensions_dir
  @extensions_dir ||= super
end

The path where this gem installs its extensions.

A long description of this gem

The description should be more detailed than the summary but not excessively long. A few paragraphs is a recommended length with no examples or formatting.

Usage:

spec.description = <<~EOF
  Rake is a Make-like program implemented in Ruby. Tasks and
  dependencies are specified in standard Ruby syntax.
EOF

A contact email address (or addresses) for this gem

Usage:

spec.email = 'john.jones@example.com'
spec.email = ['jack@example.com', 'jill@example.com']

The URL of this gem’s home page

Usage:

spec.homepage = 'https://github.com/ruby/rake'

The version of Ruby required by this gem

Usage:

spec.required_ruby_version = '>= 2.7.0'

def license=(o)
  self.licenses = [o]
end

The license for this gem.

The license must be no more than 64 characters.

This should just be the name of your license. The full text of the license should be inside of the gem (at the top level) when you build it.

The simplest way is to specify the standard SPDX ID spdx.org/licenses/ for the license. Ideally, you should pick one that is OSI (Open Source Initiative) opensource.org/licenses/ approved.

The most commonly used OSI-approved licenses are MIT and Apache-2.0. GitHub also provides a license picker at choosealicense.com/.

You can also use a custom license file along with your gemspec and specify a LicenseRef-<idstring>, where idstring is the name of the file containing the license text.

You should specify a license for your gem so that people know how they are permitted to use it and any restrictions you’re placing on it. Not specifying a license means all rights are reserved; others have no right to use the code for any purpose.

You can set multiple licenses with licenses=

Usage:

spec.license = 'MIT'

def licenses=(licenses)
  @licenses = Array licenses
end

The license(s) for the library.

Each license must be a short name, no more than 64 characters.

This should just be the name of your license. The full text of the license should be inside of the gem when you build it.

See license= for more discussion

Usage:

spec.licenses = ['MIT', 'GPL-2.0']

This gem’s name.

Usage:

spec.name = 'rake'

A short summary of this gem’s description. Displayed in gem list -d.

The description should be more detailed than the summary.

Usage:

spec.summary = "This is a small summary of my gem"

This gem’s version.

The version string can contain numbers and periods, such as 1.0.0. A gem is a ‘prerelease’ gem if the version has a letter in it, such as 1.0.0.pre.

Usage:

spec.version = '0.4.1'

def authors=(value)
  @authors = Array(value).flatten.grep(String)
end

A list of authors for this gem.

Alternatively, a single author can be specified by assigning a string to spec.author

Usage:

spec.authors = ['John Jones', 'Mary Smith']

def files
  
  
  @files = [@files,
            @test_files,
            add_bindir(@executables),
            @extra_rdoc_files,
            @extensions].flatten.compact.uniq.sort
end

Files included in this gem. You cannot append to this accessor, you must assign to it.

Only add files you can require to this list, not directories, etc.

Directories are automatically stripped from this list when building a gem, other non-files cause an error.

Usage:

require 'rake'
spec.files = FileList['lib/**/*.rb',
                      'bin/*',
                      '[A-Z]*'].to_a


spec.files = Dir['lib/**/*.rb'] + Dir['bin/*']
spec.files += Dir['[A-Z]*']
spec.files.reject! { |fn| fn.include? "CVS" }

True when this gemspec has been activated. This attribute is not persisted.

True when this gemspec has been activated. This attribute is not persisted.

Sets the default executable for this gem.

Deprecated: You must now specify the executable name to Gem.bin_path.

The Gem::Specification version of this gemspec.

Do not set this, it is set automatically when the gem is packaged.

def self._load(str)
  Gem.load_yaml
  Gem.load_safe_marshal

  yaml_set = false
  retry_count = 0

  array = begin
    Gem::SafeMarshal.safe_load str
  rescue ArgumentError => e
    
    
    
    
    
    
    
    raise if retry_count >= 3

    
    
    
    
    
    
    message = e.message
    raise unless message.include?("YAML::")

    unless Object.const_defined?(:YAML)
      Object.const_set "YAML", Psych
      yaml_set = true
    end

    if message.include?("YAML::Syck::")
      YAML.const_set "Syck", YAML unless YAML.const_defined?(:Syck)

      YAML::Syck.const_set "DefaultKey", Class.new if message.include?("YAML::Syck::DefaultKey") && !YAML::Syck.const_defined?(:DefaultKey)
    elsif message.include?("YAML::PrivateType") && !YAML.const_defined?(:PrivateType)
      YAML.const_set "PrivateType", Class.new
    end

    retry_count += 1
    retry
  ensure
    Object.__send__(:remove_const, "YAML") if yaml_set
  end

  spec = Gem::Specification.new
  spec.instance_variable_set :@specification_version, array[1]

  current_version = CURRENT_SPECIFICATION_VERSION

  field_count = if spec.specification_version > current_version
    spec.instance_variable_set :@specification_version,
                               current_version
    MARSHAL_FIELDS[current_version]
  else
    MARSHAL_FIELDS[spec.specification_version]
  end

  if array.size < field_count
    raise TypeError, "invalid Gem::Specification format #{array.inspect}"
  end

  spec.instance_variable_set :@rubygems_version,          array[0]
  
  spec.instance_variable_set :@name,                      array[2]
  spec.instance_variable_set :@version,                   array[3]
  spec.date =                                             array[4]
  spec.instance_variable_set :@summary,                   array[5]
  spec.instance_variable_set :@required_ruby_version,     array[6]
  spec.instance_variable_set :@required_rubygems_version, array[7]
  spec.platform =                                         array[8]
  spec.instance_variable_set :@dependencies,              array[9]
  
  spec.instance_variable_set :@email,                     array[11]
  spec.instance_variable_set :@authors,                   array[12]
  spec.instance_variable_set :@description,               array[13]
  spec.instance_variable_set :@homepage,                  array[14]
  spec.instance_variable_set :@has_rdoc,                  array[15]
  spec.instance_variable_set :@licenses,                  array[17]
  spec.instance_variable_set :@metadata,                  array[18]
  spec.instance_variable_set :@loaded,                    false
  spec.instance_variable_set :@activated,                 false

  spec
end

Load custom marshal format, re-initializing defaults as needed

def self.add_spec(spec)
  specification_record.add_spec(spec)
end

Adds spec to the known specifications, keeping the collection properly sorted.

def self.all
  warn "NOTE: Specification.all called from #{caller(1, 1).first}" unless
    Gem::Deprecate.skip
  _all
end

Returns all specifications. This method is discouraged from use. You probably want to use one of the Enumerable methods instead.

def self.all=(specs)
  specification_record.all = specs
end

Sets the known specs to specs.

def self.all_names
  specification_record.all_names
end

Return full names of all specs in sorted order.

def self.array_attributes
  @@array_attributes.dup
end

Return the list of all array-oriented instance variables.

def self.attribute_names
  @@attributes.dup
end

Return the list of all instance variables.

def self.default_stubs(pattern = "*.gemspec")
  base_dir = Gem.default_dir
  gems_dir = File.join base_dir, "gems"
  gemspec_stubs_in(Gem.default_specifications_dir, pattern) do |path|
    Gem::StubSpecification.default_gemspec_stub(path, base_dir, gems_dir)
  end
end

Returns a Gem::StubSpecification for default gems

def self.dirs
  @@dirs ||= Gem::SpecificationRecord.dirs_from(gem_path)
end

Return the directories that Specification uses to find specs.

def self.dirs=(dirs)
  reset

  @@dirs = Gem::SpecificationRecord.dirs_from(Array(dirs))
end

Set the directories that Specification uses to find specs. Setting this resets the list of known specs.

def self.each(&block)
  specification_record.each(&block)
end

Enumerate every known spec. See ::dirs= and ::add_spec to set the list of specs.

def self.find_active_stub_by_path(path)
  specification_record.find_active_stub_by_path(path)
end

Return the best specification that contains the file matching path, among those already activated.

def self.find_all_by_full_name(full_name)
  stubs.select {|s| s.full_name == full_name }.map(&:to_spec)
end

Returns every spec that has the given full_name

def self.find_all_by_name(name, *requirements)
  specification_record.find_all_by_name(name, *requirements)
end

Returns every spec that matches name and optional requirements.

def self.find_by_full_name(full_name)
  stubs.find {|s| s.full_name == full_name }&.to_spec
end

Find the best specification matching a full_name.

def self.find_by_name(name, *requirements)
  requirements = Gem::Requirement.default if requirements.empty?

  Gem::Dependency.new(name, *requirements).to_spec
end

Find the best specification matching a name and requirements. Raises if the dependency doesn’t resolve to a valid specification.

def self.find_by_path(path)
  specification_record.find_by_path(path)
end

Return the best specification that contains the file matching path.

def self.find_in_unresolved(path)
  unresolved_specs.find_all {|spec| spec.contains_requirable_file? path }
end

Return currently unresolved specs that contain the file matching path.

def self.find_in_unresolved_tree(path)
  unresolved_specs.each do |spec|
    spec.traverse do |_from_spec, _dep, to_spec, trail|
      if to_spec.has_conflicts? || to_spec.conficts_when_loaded_with?(trail)
        :next
      else
        return trail.reverse if to_spec.contains_requirable_file? path
      end
    end
  end

  []
end

Search through all unresolved deps and sub-dependencies and return specs that contain the file matching path.

def self.find_inactive_by_path(path)
  specification_record.find_inactive_by_path(path)
end

Return the best specification that contains the file matching path amongst the specs that are not activated.

def self.from_yaml(input)
  Gem.load_yaml

  input = normalize_yaml_input input
  spec = Gem::SafeYAML.safe_load input

  if spec && spec.class == FalseClass
    raise Gem::EndOfYAMLException
  end

  unless Gem::Specification === spec
    raise Gem::Exception, "YAML data doesn't evaluate to gem specification"
  end

  spec.specification_version ||= NONEXISTENT_SPECIFICATION_VERSION
  spec.reset_nil_attributes_to_default
  spec.flatten_require_paths

  spec
end

Special loader for YAML files. When a Specification object is loaded from a YAML file, it bypasses the normal Ruby object initialization routine (initialize). This method makes up for that and deals with gems of different ages.

input can be anything that YAML.load() accepts: String or IO.

def self.latest_spec_for(name)
  specification_record.latest_spec_for(name)
end

Return the latest installed spec for gem name.

def self.latest_specs(prerelease = false)
  specification_record.latest_specs(prerelease)
end

Return the latest specs, optionally including prerelease specs if prerelease is true.

def self.load(file)
  return unless file

  spec = @load_cache_mutex.synchronize { @load_cache[file] }
  return spec if spec

  return unless File.file?(file)

  code = Gem.open_file(file, "r:UTF-8:-", &:read)

  begin
    spec = eval code, binding, file

    if Gem::Specification === spec
      spec.loaded_from = File.expand_path file.to_s
      @load_cache_mutex.synchronize do
        prev = @load_cache[file]
        if prev
          spec = prev
        else
          @load_cache[file] = spec
        end
      end
      return spec
    end

    warn "[#{file}] isn't a Gem::Specification (#{spec.class} instead)."
  rescue SignalException, SystemExit
    raise
  rescue SyntaxError, StandardError => e
    warn "Invalid gemspec in [#{file}]: #{e}"
  end

  nil
end

Loads Ruby format gemspec from file.

def self.load_defaults
  each_spec([Gem.default_specifications_dir]) do |spec|
    
    
    Gem.register_default_spec(spec)
  end
end

Loads the default specifications. It should be called only once.

def initialize(name = nil, version = nil)
  super()
  @gems_dir              = nil
  @base_dir              = nil
  @loaded = false
  @activated = false
  @loaded_from = nil
  @original_platform = nil
  @installed_by_version = nil

  set_nil_attributes_to_nil
  set_not_nil_attributes_to_default_values

  @new_platform = Gem::Platform::RUBY

  self.name = name if name
  self.version = version if version

  if (platform = Gem.platforms.last) && platform != Gem::Platform::RUBY && platform != Gem::Platform.local
    self.platform = platform
  end

  yield self if block_given?
end

Specification constructor. Assigns the default values to the attributes and yields itself for further initialization. Optionally takes name and version.

def self.non_nil_attributes
  @@non_nil_attributes.dup
end

Specification attributes that must be non-nil

def self.normalize_yaml_input(input)
  result = input.respond_to?(:read) ? input.read : input
  result = "--- " + result unless result.start_with?("--- ")
  result = result.dup
  result.gsub!(/ !!null \n/, " \n")
  
  
  result.gsub!(/^(date: \d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2}\.\d+?)Z/, '\1 Z')
  result
end

Make sure the YAML specification is properly formatted with dashes

def self.outdated
  outdated_and_latest_version.map {|local, _| local.name }
end

Return a list of all outdated local gem names. This method is HEAVY as it must go fetch specifications from the server.

Use outdated_and_latest_version if you wish to retrieve the latest remote version as well.

def self.outdated_and_latest_version
  return enum_for __method__ unless block_given?

  
  fetcher = Gem::SpecFetcher.fetcher

  latest_specs(true).each do |local_spec|
    dependency =
      Gem::Dependency.new local_spec.name, ">= #{local_spec.version}"

    remotes, = fetcher.search_for_dependency dependency
    remotes  = remotes.map {|n, _| n.version }

    latest_remote = remotes.sort.last

    yield [local_spec, latest_remote] if
      latest_remote && local_spec.version < latest_remote
  end

  nil
end

Enumerates the outdated local gems yielding the local specification and the latest remote version.

This method may take some time to return as it must check each local gem against the server’s index.

def self.remove_spec(spec)
  specification_record.remove_spec(spec)
end

Removes spec from the known specs.

def self.required_attribute?(name)
  @@required_attributes.include? name.to_sym
end

Is name a required attribute?

def self.required_attributes
  @@required_attributes.dup
end

Required specification attributes

def self.reset
  @@dirs = nil
  Gem.pre_reset_hooks.each(&:call)
  @specification_record = nil
  clear_load_cache

  unless unresolved_deps.empty?
    unresolved = unresolved_deps.filter_map do |name, dep|
      matching_versions = find_all_by_name(name)
      next if dep.latest_version? && matching_versions.any?(&:default_gem?)

      [dep, matching_versions.uniq(&:full_name)]
    end.to_h

    unless unresolved.empty?
      warn "WARN: Unresolved or ambiguous specs during Gem::Specification.reset:"
      unresolved.each do |dep, versions|
        warn "      #{dep}"

        unless versions.empty?
          warn "      Available/installed versions of this gem:"
          versions.each {|s| warn "      - #{s.version}" }
        end
      end
      warn "WARN: Clearing out unresolved specs. Try 'gem cleanup <gem>'"
      warn "Please report a bug if this causes problems."
    end

    unresolved_deps.clear
  end
  Gem.post_reset_hooks.each(&:call)
end

Reset the list of known specs, running pre and post reset hooks registered in Gem.

def self.specification_record
  @specification_record ||= Gem::SpecificationRecord.new(dirs)
end

Keeps track of all currently known specifications

def self.unresolved_deps
  @unresolved_deps ||= Hash.new {|h, n| h[n] = Gem::Dependency.new n }
end

DOC: This method needs documented or nodoc’d

def self.unresolved_specs
  unresolved_deps.values.flat_map(&:to_specs)
end

def _dump(limit)
  Marshal.dump [
    @rubygems_version,
    @specification_version,
    @name,
    @version,
    date,
    @summary,
    @required_ruby_version,
    @required_rubygems_version,
    @original_platform,
    @dependencies,
    "", 
    @email,
    @authors,
    @description,
    @homepage,
    true, 
    @new_platform,
    @licenses,
    @metadata,
  ]
end

Dump only crucial instance variables.

def abbreviate
  self.files = []
  self.test_files = []
  self.rdoc_options = []
  self.extra_rdoc_files = []
  self.cert_chain = []
end

Abbreviate the spec for downloading. Abbreviated specs are only used for searching, downloading and related activities and do not need deployment specific information (e.g. list of files). So we abbreviate the spec, making it much smaller for quicker downloads.

def activate
  other = Gem.loaded_specs[name]
  if other
    check_version_conflict other
    return false
  end

  raise_if_conflicts

  activate_dependencies
  add_self_to_load_path

  Gem.loaded_specs[name] = self
  @activated = true
  @loaded = true

  true
end

Activate this spec, registering it as a loaded spec and adding it’s lib paths to $LOAD_PATH. Returns true if the spec was activated, false if it was previously activated. Freaks out if there are conflicts upon activation.

def activate_dependencies
  unresolved = Gem::Specification.unresolved_deps

  runtime_dependencies.each do |spec_dep|
    if loaded = Gem.loaded_specs[spec_dep.name]
      next if spec_dep.matches_spec? loaded

      msg = "can't satisfy '#{spec_dep}', already activated '#{loaded.full_name}'"
      e = Gem::LoadError.new msg
      e.name = spec_dep.name

      raise e
    end

    specs = spec_dep.matching_specs(true).uniq(&:full_name)

    if specs.size == 0
      raise Gem::MissingSpecError.new(spec_dep.name, spec_dep.requirement, "at: #{spec_file}")
    elsif specs.size == 1
      specs.first.activate
    else
      name = spec_dep.name
      unresolved[name] = unresolved[name].merge spec_dep
    end
  end

  unresolved.delete self.name
end

Activate all unambiguously resolved runtime dependencies of this spec. Add any ambiguous dependencies to the unresolved list to be resolved later, as needed.

def add_bindir(executables)
  return nil if executables.nil?

  if @bindir
    Array(executables).map {|e| File.join(@bindir, e) }
  else
    executables
  end
rescue StandardError
  nil
end

Returns an array with bindir attached to each executable in the executables list

def add_self_to_load_path
  return if default_gem?

  paths = full_require_paths

  Gem.add_to_load_path(*paths)
end

Adds this spec’s require paths to LOAD_PATH, in the proper location.

def author
  (val = authors) && val.first
end

Singular reader for authors. Returns the first author in the list

def authors
  @authors ||= []
end

The list of author names who wrote this gem.

spec.authors = ['Chad Fowler', 'Jim Weirich', 'Rich Kilmer']

def base_dir
  return Gem.dir unless loaded_from
  @base_dir ||= if default_gem?
    File.dirname File.dirname File.dirname loaded_from
  else
    File.dirname File.dirname loaded_from
  end
end

def bin_dir
  @bin_dir ||= File.join gem_dir, bindir
end

Returns the full path to installed gem’s bin directory.

NOTE: do not confuse this with bindir, which is just ‘bin’, not a full path.

def bin_file(name)
  File.join bin_dir, name
end

Returns the full path to an executable named name in this gem.

def build_args
  if File.exist? build_info_file
    build_info = File.readlines build_info_file
    build_info = build_info.map(&:strip)
    build_info.delete ""
    build_info
  else
    []
  end
end

Returns the build_args used to install the gem

def build_info_dir
  File.join base_dir, "build_info"
end

Returns the full path to the build info directory

def build_info_file
  File.join build_info_dir, "#{full_name}.info"
end

Returns the full path to the file containing the build information generated when the gem was installed

def cache_dir
  @cache_dir ||= File.join base_dir, "cache"
end

Returns the full path to the cache directory containing this spec’s cached gem.

def cache_file
  @cache_file ||= File.join cache_dir, "#{full_name}.gem"
end

Returns the full path to the cached gem for this spec.

def conflicts
  conflicts = {}
  runtime_dependencies.each do |dep|
    spec = Gem.loaded_specs[dep.name]
    if spec && !spec.satisfies_requirement?(dep)
      (conflicts[spec] ||= []) << dep
    end
  end
  env_req = Gem.env_requirement(name)
  (conflicts[self] ||= []) << env_req unless env_req.satisfied_by? version
  conflicts
end

Return any possible conflicts against the currently loaded specs.

def date
  @date ||= Time.utc(*Gem.source_date_epoch.utc.to_a[3..5].reverse)
end

The date this gem was created.

If SOURCE_DATE_EPOCH is set as an environment variable, use that to support reproducible builds; otherwise, default to the current UTC date.

Details on SOURCE_DATE_EPOCH: reproducible-builds.org/specs/source-date-epoch/

def date=(date)
  
  
  
  @date = case date
          when String then
            if DateTimeFormat =~ date
              Time.utc($1.to_i, $2.to_i, $3.to_i)
            else
              raise(Gem::InvalidSpecificationException,
                    "invalid date format in specification: #{date.inspect}")
            end
          when Time, DateLike then
            Time.utc(date.year, date.month, date.day)
          else
            TODAY
  end
end

The date this gem was created

DO NOT set this, it is set automatically when the gem is packaged.

def default_value(name)
  @@default_value[name]
end

The default value for specification attribute name

def dependent_gems(check_dev=true)
  out = []
  Gem::Specification.each do |spec|
    deps = check_dev ? spec.dependencies : spec.runtime_dependencies
    deps.each do |dep|
      next unless satisfies_requirement?(dep)
      sats = []
      find_all_satisfiers(dep) do |sat|
        sats << sat
      end
      out << [spec, dep, sats]
    end
  end
  out
end

Return a list of all gems that have a dependency on this gemspec. The list is structured with entries that conform to:

[depending_gem, dependency, [list_of_gems_that_satisfy_dependency]]

def dependent_specs
  runtime_dependencies.flat_map(&:to_specs)
end

Returns all specs that matches this spec’s runtime dependencies.

def description=(str)
  @description = str.to_s
end

A detailed description of this gem. See also summary

def development_dependencies
  dependencies.select {|d| d.type == :development }
end

List of dependencies that are used for development

def doc_dir(type = nil)
  @doc_dir ||= File.join base_dir, "doc", full_name

  if type
    File.join @doc_dir, type
  else
    @doc_dir
  end
end

Returns the full path to this spec’s documentation directory. If type is given it will be appended to the end. For example:

spec.doc_dir      

spec.doc_dir 'ri' 

def executable
  (val = executables) && val.first
end

Singular accessor for executables

def executable=(o)
  self.executables = [o]
end

Singular accessor for executables

def executables=(value)
  @executables = Array(value)
end

Sets executables to value, ensuring it is an array.

def extensions=(extensions)
  @extensions = Array extensions
end

Sets extensions to extensions, ensuring it is an array.

def file_name
  "#{full_name}.gem"
end

The default (generated) file name of the gem. See also spec_name.

spec.file_name 

def files=(files)
  @files = Array files
end

Sets files to files, ensuring it is an array.

def for_cache
  spec = dup

  spec.files = nil
  spec.test_files = nil

  spec
end

Creates a duplicate spec without large blobs that aren’t used at runtime.

def full_name
  @full_name ||= super
end

def gems_dir
  @gems_dir ||= File.join(base_dir, "gems")
end

def has_conflicts?
  return true unless Gem.env_requirement(name).satisfied_by?(version)
  runtime_dependencies.any? do |dep|
    spec = Gem.loaded_specs[dep.name]
    spec && !spec.satisfies_requirement?(dep)
  end
rescue ArgumentError => e
  raise e, "#{name} #{version}: #{e.message}"
end

Return true if there are possible conflicts against the currently loaded specs.

def initialize_copy(other_spec)
  self.class.array_attributes.each do |name|
    name = :"@#{name}"
    next unless other_spec.instance_variable_defined? name

    begin
      val = other_spec.instance_variable_get(name)
      if val
        instance_variable_set name, val.dup
      elsif Gem.configuration.really_verbose
        warn "WARNING: #{full_name} has an invalid nil value for #{name}"
      end
    rescue TypeError
      e = Gem::FormatException.new \
        "#{full_name} has an invalid value for #{name}"

      e.file_path = loaded_from
      raise e
    end
  end

  @required_ruby_version = other_spec.required_ruby_version.dup
  @required_rubygems_version = other_spec.required_rubygems_version.dup
end

Duplicates Array and Gem::Requirement attributes from other_spec so state isn’t shared.

def keep_only_files_and_directories
  @executables.delete_if      {|x| File.directory?(File.join(@bindir, x)) }
  @extensions.delete_if       {|x| File.directory?(x) && !File.symlink?(x) }
  @extra_rdoc_files.delete_if {|x| File.directory?(x) && !File.symlink?(x) }
  @files.delete_if            {|x| File.directory?(x) && !File.symlink?(x) }
  @test_files.delete_if       {|x| File.directory?(x) && !File.symlink?(x) }
end

def lib_files
  @files.select do |file|
    require_paths.any? do |path|
      file.start_with? path
    end
  end
end

Files in the Gem under one of the require_paths

def license
  licenses.first
end

Singular accessor for licenses

def licenses
  @licenses ||= []
end

Plural accessor for setting licenses

See license= for details

def missing_extensions?
  return false if extensions.empty?
  return false if default_gem?
  return false if File.exist? gem_build_complete_path

  true
end

Is this specification missing its extensions? When this returns true you probably want to build_extensions

def name_tuple
  Gem::NameTuple.new name, version, original_platform
end

Return a NameTuple that represents this Specification

def normalize
  if defined?(@extra_rdoc_files) && @extra_rdoc_files
    @extra_rdoc_files.uniq!
    @files ||= []
    @files.concat(@extra_rdoc_files)
  end

  @files            = @files.uniq.sort if @files
  @extensions       = @extensions.uniq.sort if @extensions
  @test_files       = @test_files.uniq.sort if @test_files
  @executables      = @executables.uniq.sort if @executables
  @extra_rdoc_files = @extra_rdoc_files.uniq.sort if @extra_rdoc_files
end

Normalize the list of files so that:

• All file lists have redundancies removed.

• Files referenced in the extra_rdoc_files are included in the package file list.

def platform
  @new_platform ||= Gem::Platform::RUBY 
end

The platform this gem runs on. See Gem::Platform for details.

def rdoc_options=(options)
  @rdoc_options = Array options
end

Sets rdoc_options to value, ensuring it is an array.

def require_path
  (val = require_paths) && val.first
end

Singular accessor for require_paths

def require_path=(path)
  self.require_paths = Array(path)
end

Singular accessor for require_paths

def requirements=(req)
  @requirements = Array req
end

Set requirements to req, ensuring it is an array.

def reset_nil_attributes_to_default
  nil_attributes = self.class.non_nil_attributes.find_all do |name|
    !instance_variable_defined?("@#{name}") || instance_variable_get("@#{name}").nil?
  end

  nil_attributes.each do |attribute|
    default = default_value attribute

    value = case default
            when Time, Numeric, Symbol, true, false, nil then default
            else default.dup
    end

    instance_variable_set "@#{attribute}", value
  end

  @installed_by_version ||= nil

  nil
end

Reset nil attributes to their default values to make the spec valid

def ri_dir
  @ri_dir ||= File.join base_dir, "ri", full_name
end

Returns the full path to this spec’s ri directory.

def runtime_dependencies
  dependencies.select(&:runtime?)
end

List of dependencies that will automatically be activated at runtime.

def sanitize
  self.summary              = sanitize_string(summary)
  self.description          = sanitize_string(description)
  self.post_install_message = sanitize_string(post_install_message)
  self.authors              = authors.collect {|a| sanitize_string(a) }
end

Sanitize the descriptive fields in the spec. Sometimes non-ASCII characters will garble the site index. Non-ASCII characters will be replaced by their XML entity equivalent.

def sanitize_string(string)
  return string unless string

  
  
  
  string.to_s
end

Sanitize a single string.

def satisfies_requirement?(dependency)
  @name == dependency.name &&
    dependency.requirement.satisfied_by?(@version)
end

Checks if this specification meets the requirement of dependency.

def sort_obj
  [@name, @version, Gem::Platform.sort_priority(@new_platform)]
end

Returns an object you can use to sort specifications in sort_by.

def spec_dir
  @spec_dir ||= File.join base_dir, "specifications"
end

Returns the full path to the directory containing this spec’s gemspec file. eg: /usr/local/lib/ruby/gems/1.8/specifications

def spec_file
  @spec_file ||= File.join spec_dir, "#{full_name}.gemspec"
end

Returns the full path to this spec’s gemspec file. eg: /usr/local/lib/ruby/gems/1.8/specifications/mygem-1.0.gemspec

def spec_name
  "#{full_name}.gemspec"
end

The default name of the gemspec. See also file_name

spec.spec_name 

def summary=(str)
  @summary = str.to_s.strip.
    gsub(/(\w-)\n[ \t]*(\w)/, '\1\2').gsub(/\n[ \t]*/, " ") 
end

A short summary of this gem’s description.

def to_ruby
  result = []
  result << "# -*- encoding: utf-8 -*-"
  result << "#{Gem::StubSpecification::PREFIX}#{name} #{version} #{platform} #{raw_require_paths.join("\0")}"
  result << "#{Gem::StubSpecification::PREFIX}#{extensions.join "\0"}" unless
    extensions.empty?
  result << nil
  result << "Gem::Specification.new do |s|"

  result << "  s.name = #{ruby_code name}"
  result << "  s.version = #{ruby_code version}"
  unless platform.nil? || platform == Gem::Platform::RUBY
    result << "  s.platform = #{ruby_code original_platform}"
  end
  result << ""
  result << "  s.required_rubygems_version = #{ruby_code required_rubygems_version} if s.respond_to? :required_rubygems_version="

  if metadata && !metadata.empty?
    result << "  s.metadata = #{ruby_code metadata} if s.respond_to? :metadata="
  end
  result << "  s.require_paths = #{ruby_code raw_require_paths}"

  handled = [
    :dependencies,
    :name,
    :platform,
    :require_paths,
    :required_rubygems_version,
    :specification_version,
    :version,
    :has_rdoc,
    :default_executable,
    :metadata,
    :signing_key,
  ]

  @@attributes.each do |attr_name|
    next if handled.include? attr_name
    current_value = send(attr_name)
    if current_value != default_value(attr_name) || self.class.required_attribute?(attr_name)
      result << "  s.#{attr_name} = #{ruby_code current_value}"
    end
  end

  if String === signing_key
    result << "  s.signing_key = #{ruby_code signing_key}"
  end

  if @installed_by_version
    result << nil
    result << "  s.installed_by_version = #{ruby_code Gem::VERSION}"
  end

  unless dependencies.empty?
    result << nil
    result << "  s.specification_version = #{specification_version}"
    result << nil

    dependencies.each do |dep|
      dep.instance_variable_set :@type, :runtime if dep.type.nil? 
      result << "  s.add_#{dep.type}_dependency(%q<#{dep.name}>.freeze, #{ruby_code dep.requirements_list})"
    end
  end

  result << "end"
  result << nil

  result.join "\n"
end

Returns a Ruby code representation of this specification, such that it can be eval’ed and reconstruct the same specification later. Attributes that still have their default values are omitted.

def to_ruby_for_cache
  for_cache.to_ruby
end

Returns a Ruby lighter-weight code representation of this specification, used for indexing only.

See to_ruby.

def traverse(trail = [], visited = {}, &block)
  trail.push(self)
  begin
    runtime_dependencies.each do |dep|
      dep.matching_specs(true).each do |dep_spec|
        next if visited.key?(dep_spec)
        visited[dep_spec] = true
        trail.push(dep_spec)
        begin
          result = block[self, dep, dep_spec, trail]
        ensure
          trail.pop
        end
        next if result == :next
        spec_name = dep_spec.name
        dep_spec.traverse(trail, visited, &block) unless
          trail.any? {|s| s.name == spec_name }
      end
    end
  ensure
    trail.pop
  end
end

Recursively walk dependencies of this spec, executing the block for each hop.

def validate(packaging = true, strict = false)
  normalize

  validation_policy = Gem::SpecificationPolicy.new(self)
  validation_policy.packaging = packaging
  validation_policy.validate(strict)
end

Checks that the specification contains all required fields, and does a very basic sanity check.

Raises InvalidSpecificationException if the spec does not pass the checks..

def validate_dependencies
  Gem::SpecificationPolicy.new(self).validate_dependencies
end

def validate_for_resolution
  Gem::SpecificationPolicy.new(self).validate_for_resolution
end

def validate_permissions
  Gem::SpecificationPolicy.new(self).validate_permissions
end

def version=(version)
  @version = Gem::Version.create(version)
  return if @version.nil?

  invalidate_memoized_attributes
end

Set the version to version.

def add_dependency_with_type(dependency, type, requirements)
  requirements = if requirements.empty?
    Gem::Requirement.default
  else
    requirements.flatten
  end

  unless dependency.respond_to?(:name) &&
         dependency.respond_to?(:requirement)
    dependency = Gem::Dependency.new(dependency.to_s, requirements, type)
  end

  dependencies << dependency
end

Adds a dependency on gem dependency with type type that requires requirements. Valid types are currently :runtime and :development.

def find_all_satisfiers(dep)
  Gem::Specification.each do |spec|
    yield spec if spec.satisfies_requirement? dep
  end
end

Finds all gems that satisfy dep

def invalidate_memoized_attributes
  @full_name = nil
  @cache_file = nil
end

Expire memoized instance variables that can incorrectly generate, replace or miss files due changes in certain attributes used to compute them.

def ruby_code(obj)
  case obj
  when String             then obj.dump + ".freeze"
  when Array              then "[" + obj.map {|x| ruby_code x }.join(", ") + "]"
  when Hash               then
    seg = obj.keys.sort.map {|k| "#{k.to_s.dump} => #{obj[k].to_s.dump}" }
    "{ #{seg.join(", ")} }"
  when Gem::Version       then ruby_code(obj.to_s)
  when DateLike           then obj.strftime("%Y-%m-%d").dump
  when Time               then obj.strftime("%Y-%m-%d").dump
  when Numeric            then obj.inspect
  when true, false, nil   then obj.inspect
  when Gem::Platform      then "Gem::Platform.new(#{ruby_code obj.to_a})"
  when Gem::Requirement   then
    list = obj.as_list
    "Gem::Requirement.new(#{ruby_code(list.size == 1 ? obj.to_s : list)})"
  else raise Gem::Exception, "ruby_code case not handled: #{obj.class}"
  end
end

Return a string containing a Ruby code representation of the given object.

def same_attributes?(spec)
  @@attributes.all? {|name, _default| send(name) == spec.send(name) }
end

True if this gem has the same attributes as other.

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