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# frozen_string_literal: true #-- # Copyright 2006 by Chad Fowler, Rich Kilmer, Jim Weirich and others. # All rights reserved. # See LICENSE.txt for permissions. #++ require 'tsort' require 'rubygems/deprecate' ## # Gem::DependencyList is used for installing and uninstalling gems in the # correct order to avoid conflicts. #-- # TODO: It appears that all but topo-sort functionality is being duplicated # (or is planned to be duplicated) elsewhere in rubygems. Is the majority of # this class necessary anymore? Especially #ok?, #why_not_ok? class Gem::DependencyList attr_reader :specs include Enumerable include TSort ## # Allows enabling/disabling use of development dependencies attr_accessor :development ## # Creates a DependencyList from the current specs. def self.from_specs list = new list.add(*Gem::Specification.to_a) list end ## # Creates a new DependencyList. If +development+ is true, development # dependencies will be included. def initialize development = false @specs = [] @development = development end ## # Adds +gemspecs+ to the dependency list. def add(*gemspecs) @specs.concat gemspecs end def clear @specs.clear end ## # Return a list of the gem specifications in the dependency list, sorted in # order so that no gemspec in the list depends on a gemspec earlier in the # list. # # This is useful when removing gems from a set of installed gems. By # removing them in the returned order, you don't get into as many dependency # issues. # # If there are circular dependencies (yuck!), then gems will be returned in # order until only the circular dependents and anything they reference are # left. Then arbitrary gemspecs will be returned until the circular # dependency is broken, after which gems will be returned in dependency # order again. def dependency_order sorted = strongly_connected_components.flatten result = [] seen = {} sorted.each do |spec| if index = seen[spec.name] then if result[index].version < spec.version then result[index] = spec end else seen[spec.name] = result.length result << spec end end result.reverse end ## # Iterator over dependency_order def each(&block) dependency_order.each(&block) end def find_name(full_name) @specs.find { |spec| spec.full_name == full_name } end def inspect # :nodoc: "#<%s:0x%x %p>" % [self.class, object_id, map { |s| s.full_name }] end ## # Are all the dependencies in the list satisfied? def ok? why_not_ok?(:quick).empty? end def why_not_ok? quick = false unsatisfied = Hash.new { |h,k| h[k] = [] } each do |spec| spec.runtime_dependencies.each do |dep| inst = Gem::Specification.any? { |installed_spec| dep.name == installed_spec.name and dep.requirement.satisfied_by? installed_spec.version } unless inst or @specs.find { |s| s.satisfies_requirement? dep } then unsatisfied[spec.name] << dep return unsatisfied if quick end end end unsatisfied end ## # Is is ok to remove a gemspec from the dependency list? # # If removing the gemspec creates breaks a currently ok dependency, then it # is NOT ok to remove the gemspec. def ok_to_remove?(full_name, check_dev=true) gem_to_remove = find_name full_name # If the state is inconsistent, at least don't crash return true unless gem_to_remove siblings = @specs.find_all { |s| s.name == gem_to_remove.name && s.full_name != gem_to_remove.full_name } deps = [] @specs.each do |spec| check = check_dev ? spec.dependencies : spec.runtime_dependencies check.each do |dep| deps << dep if gem_to_remove.satisfies_requirement?(dep) end end deps.all? { |dep| siblings.any? { |s| s.satisfies_requirement? dep } } end ## # Remove everything in the DependencyList that matches but doesn't # satisfy items in +dependencies+ (a hash of gem names to arrays of # dependencies). def remove_specs_unsatisfied_by dependencies specs.reject! { |spec| dep = dependencies[spec.name] dep and not dep.requirement.satisfied_by? spec.version } end ## # Removes the gemspec matching +full_name+ from the dependency list def remove_by_name(full_name) @specs.delete_if { |spec| spec.full_name == full_name } end ## # Return a hash of predecessors. <tt>result[spec]</tt> is an Array of # gemspecs that have a dependency satisfied by the named gemspec. def spec_predecessors result = Hash.new { |h,k| h[k] = [] } specs = @specs.sort.reverse specs.each do |spec| specs.each do |other| next if spec == other other.dependencies.each do |dep| if spec.satisfies_requirement? dep then result[spec] << other end end end end result end def tsort_each_node(&block) @specs.each(&block) end def tsort_each_child(node) specs = @specs.sort.reverse dependencies = node.runtime_dependencies dependencies.push(*node.development_dependencies) if @development dependencies.each do |dep| specs.each do |spec| if spec.satisfies_requirement? dep then yield spec break end end end end private ## # Count the number of gemspecs in the list +specs+ that are not in # +ignored+. def active_count(specs, ignored) specs.count { |spec| ignored[spec.full_name].nil? } end end
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