class RuboCop::Cop::Lint::ParenthesesAsGroupedExpression

Checks for space between a the name of a called method and a left parenthesis.

@example

# bad

puts (x + y)

@example

# good

puts(x + y)

Constants

MSG

Public Instance Methods

on_send(node) click to toggle source
# File lib/rubocop/cop/lint/parentheses_as_grouped_expression.rb, line 22
def on_send(node)
  return unless node.arguments.one?
  return if node.operator_method? || node.setter_method?

  return unless node.first_argument.source.start_with?('(')

  space_length = spaces_before_left_parenthesis(node)
  return unless space_length > 0

  range = space_range(node.first_argument.source_range, space_length)

  add_offense(nil, location: range)
end

Private Instance Methods

space_range(expr, space_length) click to toggle source
# File lib/rubocop/cop/lint/parentheses_as_grouped_expression.rb, line 54
def space_range(expr, space_length)
  range_between(expr.begin_pos - space_length, expr.begin_pos)
end
spaces_before_left_parenthesis(node) click to toggle source
# File lib/rubocop/cop/lint/parentheses_as_grouped_expression.rb, line 38
def spaces_before_left_parenthesis(node)
  receiver = node.receiver
  receiver_length = if receiver
                      receiver.source.length
                    else
                      0
                    end
  without_receiver = node.source[receiver_length..-1]

  # Escape question mark if any.
  method_regexp = Regexp.escape(node.method_name)

  match = without_receiver.match(/^\s*\.?\s*#{method_regexp}(\s+)\(/)
  match ? match.captures[0].length : 0
end