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Class: Gem::DependencyList

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Instance Chain:
self, TSort, Enumerable
Inherits: Object
Defined in: lib/rubygems/dependency_list.rb

Overview

DependencyList is used for installing and uninstalling gems in the correct order to avoid conflicts.

Class Method Summary

Instance Attribute Summary

Instance Method Summary

Constructor Details

.new(development = false) ⇒ DependencyList

Creates a new DependencyList. If #development is true, development dependencies will be included.

[ GitHub ] 

  


# File 'lib/rubygems/dependency_list.rb', line 43



def initialize development = false
  @specs = []

  @development = development
end


  







Class Method Details



  

    .from_specs  
  



  

    

Creates a DependencyList from the current specs.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 33



def self.from_specs
  list = new
  list.add(*Gem::Specification.to_a)
  list
end


  







Instance Attribute Details



  

    #development   (rw)
  



  

    

Allows enabling/disabling use of development dependencies


  



  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 28



attr_accessor :development


  








  

    #ok?  ⇒ Boolean  (readonly)
  



  

    

Are all the dependencies in the list satisfied?


  





  


  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 113



def ok?
  why_not_ok?(:quick).empty?
end


  








  

    #specs   (readonly)
  

  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 20



attr_reader :specs


  







Instance Method Details



  

    #active_count(specs, ignored)   (private)
  



  

    

Count the number of gemspecs in the list #specs that are not in ignored.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 239



def active_count(specs, ignored)
  specs.count { |spec| ignored[spec.full_name].nil? }
end


  








  

    #add(*gemspecs)  
  



  

    

Adds gemspecs to the dependency list.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 52



def add(*gemspecs)
  @specs.concat gemspecs
end


  








  

    #clear  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 56



def clear
  @specs.clear
end


  








  

    #dependency_order  
  



  

    

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.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 75



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


  








  

    #each(&block)  
  



  

    

Iterator over dependency_order


  



  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 98



def each(&block)
  dependency_order.each(&block)
end


  








  

    #find_name(full_name)  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 102



def find_name(full_name)
  @specs.find { |spec| spec.full_name == full_name }
end


  








  

    #ok_to_remove?(full_name, check_dev = true)  ⇒ Boolean 
  



  

    

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.


  





  


  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 142



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_by_name(full_name)  
  



  

    

Removes the gemspec matching full_name from the dependency list


  



  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 185



def remove_by_name(full_name)
  @specs.delete_if { |spec| spec.full_name == full_name }
end


  








  

    #remove_specs_unsatisfied_by(dependencies)  
  



  

    

Remove everything in the DependencyList that matches but doesn't satisfy items in dependencies (a hash of gem names to arrays of dependencies).


  



  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 175



def remove_specs_unsatisfied_by dependencies
  specs.reject! { |spec|
    dep = dependencies[spec.name]
    dep and not dep.requirement.satisfied_by? spec.version
  }
end


  








  

    #spec_predecessors  
  



  

    

Return a hash of predecessors.  result[spec] is an Array of gemspecs that have a dependency satisfied by the named gemspec.


  



  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 193



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


  








  

    #tsort_each_child(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 217



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


  








  

    #tsort_each_node(&block)  
  

  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 213



def tsort_each_node(&block)
  @specs.each(&block)
end


  








  

    #why_not_ok?(quick = false)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubygems/dependency_list.rb', line 117



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