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require "rubygems/requirement"
##
# The Dependency class holds a Gem name and a Gem::Requirement.
class Gem::Dependency
##
# Valid dependency types.
#--
# When this list is updated, be sure to change
# Gem::Specification::CURRENT_SPECIFICATION_VERSION as well.
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
if Regexp === name 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
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:
"<%s type=%p name=%p requirements=%p>" %
[self.class, self.type, self.name, requirement.to_s]
end
##
# Does this dependency require a prerelease?
def prerelease?
@prerelease || requirement.prerelease?
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.
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
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
def match? name, version
return false unless self.name === name
return true if requirement.none?
requirement.satisfied_by? Gem::Version.new(version)
end
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
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
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.all_names.join ", "
error = Gem::LoadError.new "Could not find #{name} (#{requirement}) amongst [#{specs}]"
error.name = self.name
error.requirement = self.requirement
raise error
end
# TODO: any other resolver validations should go here
matches
end
def to_spec
matches = self.to_specs
matches.find { |spec| spec.activated? } or matches.last
end
end