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#--
# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
# All rights reserved.
# See LICENSE.txt for permissions.
#++
require 'rubygems'
##
# 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
##
# Dependency type.
attr_reader :type
##
# Dependent versions.
attr_writer :version_requirements
##
# Orders dependencies by name only.
def <=>(other)
[@name] <=> [other.name]
end
##
# Constructs a dependency with +name+ and +requirements+.
def initialize(name, version_requirements, type=:runtime)
@name = name
unless TYPES.include? type
raise ArgumentError, "Valid types are #{TYPES.inspect}, not #{@type.inspect}"
end
@type = type
@version_requirements = Gem::Requirement.create version_requirements
@version_requirement = nil # Avoid warnings.
end
def version_requirements
normalize if defined? @version_requirement and @version_requirement
@version_requirements
end
def requirement_list
version_requirements.as_list
end
alias requirements_list requirement_list
def normalize
ver = @version_requirement.instance_eval { @version }
@version_requirements = Gem::Requirement.new([ver])
@version_requirement = nil
end
def to_s # :nodoc:
"#{name} (#{version_requirements}, #{@type || :runtime})"
end
def ==(other) # :nodoc:
self.class === other &&
self.name == other.name &&
self.type == other.type &&
self.version_requirements == other.version_requirements
end
##
# Uses this dependency as a pattern to compare to the dependency +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)
return false unless self.class === other
pattern = @name
pattern = /\A#{@name}\Z/ unless Regexp === pattern
return false unless pattern =~ other.name
reqs = other.version_requirements.requirements
return false unless reqs.length == 1
return false unless reqs.first.first == '='
version = reqs.first.last
version_requirements.satisfied_by? version
end
def hash # :nodoc:
name.hash + type.hash + version_requirements.hash
end
end
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