class RuboCop::Cop::Style::NestedTernaryOperator

end
a2
else
b ? b1 : b2
if a
# good
a ? (b ? b1 : b2) : a2
# bad
@example
This cop checks for nested ternary op expressions.

def if_node(node) 

def if_node(node)
  node = node.parent
  return node if node.if_type?
  if_node(node)
end

def on_if(node) 

def on_if(node)
  return unless node.ternary?
  node.each_descendant(:if).select(&:ternary?).each do |nested_ternary|
    add_offense(nested_ternary) do |corrector|
      if_node = if_node(nested_ternary)
      corrector.replace(if_node, <<~RUBY.chop)
        if #{if_node.condition.source}
          #{remove_parentheses(if_node.if_branch.source)}
        else
          #{if_node.else_branch.source}
        end
      RUBY
    end
  end
end

def remove_parentheses(source) 

def remove_parentheses(source)
  return source unless source.start_with?('(')
  source.delete_prefix('(').delete_suffix(')')
end