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Class: RuboCop::Cop::Style::ParallelAssignment::AssignmentSorter

Relationships & Source Files
Super Chains via Extension / Inclusion / Inheritance
Class Chain:
self, Macros
Instance Chain:
self, TSort
Inherits: Object
Defined in: lib/rubocop/cop/style/parallel_assignment.rb

Overview

Helper class necessitated by silly design of TSort prior to Ruby 2.1 Newer versions have a better API, but that doesn’t help us

Class Method Summary

Instance Method Summary

Constructor Details

.new(assignments) ⇒ AssignmentSorter

[ GitHub ] 

  


# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 136



def initialize(assignments)
  @assignments = assignments
end


  







Instance Method Details



  

    #accesses?(rhs, lhs)  ⇒ Boolean 
  



  

    


lhs is an assignment method call like obj.attr= or ary[idx]=.
Does rhs access the same value which is assigned by lhs?



  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 165



def accesses?(rhs, lhs)
  if lhs.method?(:[]=)
    # FIXME: Workaround `rubocop:disable` comment for JRuby.
    # rubocop:disable Performance/RedundantEqualityComparisonBlock
    matching_calls(rhs, lhs.receiver, :[]).any? { |args| args == lhs.arguments }
    # rubocop:enable Performance/RedundantEqualityComparisonBlock
  else
    access_method = lhs.method_name.to_s.chop.to_sym
    matching_calls(rhs, lhs.receiver, access_method).any?
  end
end


  








  

    #dependency?(lhs, rhs)  ⇒ Boolean 
  



  

    
  





  


  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 158



def dependency?(lhs, rhs)
  uses_var?(rhs, var_name(lhs)) ||
    (lhs.send_type? && lhs.assignment_method? && accesses?(rhs, lhs))
end


  








  

    #matching_calls(node, receiver, method_name)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 134



def_node_search :matching_calls, '(send %1 %2 $...)'


  








  

    #tsort_each_child(assignment)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 144



def tsort_each_child(assignment)
  # yield all the assignments which must come after `assignment`
  # (due to dependencies on the previous value of the assigned var)
  my_lhs, _my_rhs = *assignment

  @assignments.each do |other|
    _other_lhs, other_rhs = *other

    next unless dependency?(my_lhs, other_rhs)

    yield other
  end
end


  








  

    #tsort_each_node  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 140



def tsort_each_node(...)
  @assignments.each(...)
end


  








  

    #uses_var?(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 131



def_node_search :uses_var?, '{({lvar ivar cvar gvar} %) (const _ %)}'


  








  

    #var_name(node)  
  

  [ GitHub ]


  

  


# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 128



def_node_matcher :var_name, '{(casgn _ $_) (_ $_)}'