Class: Rubocop::Cop::Lint::ParenthesesAsGroupedExpression

Inherits:
Cop
  • Object
show all
Defined in:
lib/rubocop/cop/lint/parentheses_as_grouped_expression.rb

Overview

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

puts (x + y)

Constant Summary collapse

MSG = 
'(...) interpreted as grouped expression.'

Constants inherited from Cop

Cop::OPERATOR_METHODS

Instance Attribute Summary

Attributes inherited from Cop

#config, #corrections, #offences, #processed_source

Instance Method Summary collapse

Methods inherited from Cop

#add_offence, all, #autocorrect?, #autocorrect_action, #convention, #cop_config, #cop_name, cop_name, cop_type, #debug?, #ignore_node, inherited, #initialize, lint?, #message, rails?, style?, #warning

Constructor Details

This class inherits a constructor from Rubocop::Cop::Cop

Instance Method Details

#on_send(node) ⇒ Object 



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# File 'lib/rubocop/cop/lint/parentheses_as_grouped_expression.rb', line 15

def on_send(node)
  receiver, method_name, args = *node
  if OPERATOR_METHODS.include?(method_name) ||
      method_name.to_s.end_with?('=')
    return
  end
  if args && args.loc.expression.source.start_with?('(')
    receiver_length = if receiver
                        receiver.loc.expression.source.length
                      else
                        0
                      end
    without_receiver = node.loc.expression.source[receiver_length..-1]

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

    if (match =
        without_receiver.match(/^\s*\.?\s*#{method_regexp}(\s+)\(/))
      expr = args.loc.expression
      space_length = match.captures[0].length
      space_range =
        Parser::Source::Range.new(expr.source_buffer,
                                  expr.begin_pos - space_length,
                                  expr.begin_pos)
      warning(nil, space_range)
    end
  end
end