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Edit File : dependency_list.rb \| Size : 5.58 KB
#-- # 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. 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.map) list end ## # Creates a DependencyList from a Gem::SourceIndex +source_index+ def self.from_source_index(ignored=nil) warn "NOTE: DependencyList.from_source_index ignores it's arg" if ignored from_specs 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.push(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) gem_to_remove = find_name full_name siblings = @specs.find_all { \|s\| s.name == gem_to_remove.name && s.full_name != gem_to_remove.full_name } deps = [] @specs.each do \|spec\| spec.dependencies.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, &block) 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 begin yield spec rescue TSort::Cyclic # do nothing end 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 class Gem::DependencyList class << self extend Gem::Deprecate deprecate :from_source_index, "from_specs", 2011, 11 end end Back

Edit File : dependency_list.rb | Size : 5.58 KB

#--
# 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.

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.map)
    list
  end

##
  # Creates a DependencyList from a Gem::SourceIndex +source_index+

def self.from_source_index(ignored=nil)
    warn "NOTE: DependencyList.from_source_index ignores it's arg" if ignored

from_specs
  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.push(*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)
    gem_to_remove = find_name full_name

siblings = @specs.find_all { |s|
      s.name == gem_to_remove.name &&
        s.full_name != gem_to_remove.full_name
    }

deps = []

@specs.each do |spec|
      spec.dependencies.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, &block)
    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
          begin
            yield spec
          rescue TSort::Cyclic
            # do nothing
          end
          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

class Gem::DependencyList
  class << self
    extend Gem::Deprecate
    deprecate :from_source_index, "from_specs", 2011, 11
  end
end

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