120 lines
2.5 KiB
Ruby
120 lines
2.5 KiB
Ruby
#--
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# Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others.
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# All rights reserved.
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# See LICENSE.txt for permissions.
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#++
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require 'rubygems'
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##
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# The Dependency class holds a Gem name and a Gem::Requirement
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class Gem::Dependency
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##
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# Valid dependency types.
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#--
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# When this list is updated, be sure to change
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# Gem::Specification::CURRENT_SPECIFICATION_VERSION as well.
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TYPES = [
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:development,
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:runtime,
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]
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##
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# Dependency name or regular expression.
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attr_accessor :name
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##
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# Dependency type.
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attr_reader :type
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##
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# Dependent versions.
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attr_writer :version_requirements
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##
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# Orders dependencies by name only.
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def <=>(other)
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[@name] <=> [other.name]
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end
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##
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# Constructs a dependency with +name+ and +requirements+.
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def initialize(name, version_requirements, type=:runtime)
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@name = name
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unless TYPES.include? type
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raise ArgumentError, "Valid types are #{TYPES.inspect}, not #{@type.inspect}"
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end
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@type = type
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@version_requirements = Gem::Requirement.create version_requirements
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@version_requirement = nil # Avoid warnings.
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end
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def version_requirements
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normalize if defined? @version_requirement and @version_requirement
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@version_requirements
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end
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def requirement_list
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version_requirements.as_list
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end
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alias requirements_list requirement_list
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def normalize
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ver = @version_requirement.instance_eval { @version }
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@version_requirements = Gem::Requirement.new([ver])
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@version_requirement = nil
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end
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def to_s # :nodoc:
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"#{name} (#{version_requirements}, #{@type || :runtime})"
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end
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def ==(other) # :nodoc:
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self.class === other &&
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self.name == other.name &&
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self.type == other.type &&
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self.version_requirements == other.version_requirements
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end
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##
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# Uses this dependency as a pattern to compare to the dependency +other+.
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# This dependency will match if the name matches the other's name, and other
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# has only an equal version requirement that satisfies this dependency.
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def =~(other)
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return false unless self.class === other
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pattern = @name
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pattern = /\A#{@name}\Z/ unless Regexp === pattern
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return false unless pattern =~ other.name
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reqs = other.version_requirements.requirements
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return false unless reqs.length == 1
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return false unless reqs.first.first == '='
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version = reqs.first.last
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version_requirements.satisfied_by? version
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end
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def hash # :nodoc:
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name.hash + type.hash + version_requirements.hash
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end
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end
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