class RuboCop::Cop::VariableForce::Assignment

# File lib/rubocop/cop/variable_force/assignment.rb, line 16
def initialize(node, variable)
  unless VARIABLE_ASSIGNMENT_TYPES.include?(node.type)
    raise ArgumentError,
          "Node type must be any of #{VARIABLE_ASSIGNMENT_TYPES}, " \
          "passed #{node.type}"
  end

  @node = node
  @variable = variable
  @referenced = false
  @references = []
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 50
def exception_assignment?
  node.parent&.resbody_type? && node.parent.exception_variable == node
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 72
def for_assignment?
  return false unless meta_assignment_node

  meta_assignment_node.for_type?
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 83
def meta_assignment_node
  unless instance_variable_defined?(:@meta_assignment_node)
    @meta_assignment_node = operator_assignment_node ||
                            multiple_assignment_node ||
                            rest_assignment_node ||
                            for_assignment_node
  end

  @meta_assignment_node
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 60
def multiple_assignment?
  return false unless meta_assignment_node

  meta_assignment_node.type == MULTIPLE_ASSIGNMENT_TYPE
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 29
def name
  @node.children.first
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 78
def operator
  assignment_node = meta_assignment_node || @node
  assignment_node.loc.operator.source
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 54
def operator_assignment?
  return false unless meta_assignment_node

  OPERATOR_ASSIGNMENT_TYPES.include?(meta_assignment_node.type)
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 37
def reference!(node)
  @references << node
  @referenced = true
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 46
def regexp_named_capture?
  @node.type == REGEXP_NAMED_CAPTURE_TYPE
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 66
def rest_assignment?
  return false unless meta_assignment_node

  meta_assignment_node.type == REST_ASSIGNMENT_TYPE
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 33
def scope
  @variable.scope
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 42
def used?
  @variable.captured_by_block? || @referenced
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 127
def find_multiple_assignment_node(grandparent_node)
  return unless grandparent_node.type == MULTIPLE_LEFT_HAND_SIDE_TYPE
  return if grandparent_node.children.any?(&:splat_type?)

  parent = grandparent_node.parent
  return parent if parent.type == MULTIPLE_ASSIGNMENT_TYPE

  find_multiple_assignment_node(parent)
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 121
def for_assignment_node
  return nil unless node.parent&.for_type?

  node.parent
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 104
def multiple_assignment_node
  return nil unless (grandparent_node = node.parent&.parent)
  if (node = find_multiple_assignment_node(grandparent_node))
    return node
  end
  return nil unless grandparent_node.type == MULTIPLE_ASSIGNMENT_TYPE

  grandparent_node
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 96
def operator_assignment_node
  return nil unless node.parent
  return nil unless OPERATOR_ASSIGNMENT_TYPES.include?(node.parent.type)
  return nil unless node.sibling_index.zero?

  node.parent
end

# File lib/rubocop/cop/variable_force/assignment.rb, line 114
def rest_assignment_node
  return nil unless node.parent
  return nil unless node.parent.type == REST_ASSIGNMENT_TYPE

  node.parent
end