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

Inherits:
Object
  • Object
show all
Extended by:
NodePattern::Macros
Includes:
TSort
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

Instance Method Summary collapse

Methods included from NodePattern::Macros

def_node_matcher, def_node_search, node_search, node_search_all, node_search_body, node_search_first

Constructor Details

#initialize(assignments) ⇒ AssignmentSorter 



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# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 130

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?



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# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 159

def accesses?(rhs, lhs)
  if lhs.method?(:[]=)
    matching_calls(rhs, lhs.receiver, :[]).any? do |args|
      args == lhs.arguments
    end
  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 



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# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 152

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

#tsort_each_child(assignment) ⇒ Object 



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# File 'lib/rubocop/cop/style/parallel_assignment.rb', line 138

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 ⇒ Object 



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

def tsort_each_node
  @assignments.each { |a| yield a }
end