class RuboCop::Cop::Style::Not


x = !something
# good
x = (not something)
# bad - parentheses are required because of op precedence
@example
This cop checks for uses of the keyword ‘not` instead of `!`.

def correct_opposite_method(corrector, range, child) 

def correct_opposite_method(corrector, range, child)
  corrector.remove(range)
  corrector.replace(child.loc.selector, OPPOSITE_METHODS[child.method_name].to_s)
end

def correct_with_parens(corrector, range, node) 

def correct_with_parens(corrector, range, node)
  corrector.replace(range, '!(')
  corrector.insert_after(node, ')')
end

def correct_without_parens(corrector, range) 

def correct_without_parens(corrector, range)
  corrector.replace(range, '!')
end

def on_send(node) 

def on_send(node)
  return unless node.prefix_not?
  add_offense(node.loc.selector) do |corrector|
    range = range_with_surrounding_space(range: node.loc.selector, side: :right)
    if opposite_method?(node.receiver)
      correct_opposite_method(corrector, range, node.receiver)
    elsif requires_parens?(node.receiver)
      correct_with_parens(corrector, range, node)
    else
      correct_without_parens(corrector, range)
    end
  end
end

def opposite_method?(child) 

def opposite_method?(child)
  child.send_type? && OPPOSITE_METHODS.key?(child.method_name)
end

def requires_parens?(child) 

def requires_parens?(child)
  child.and_type? || child.or_type? ||
    (child.send_type? && child.binary_operation?) ||
    (child.if_type? && child.ternary?)
end