Contents

# encoding: utf-8

module Rubocop
  module Cop
    module Style
      # Here we check if the parameters on a multi-line method call are
      # aligned.
      class AlignParameters < Cop
        MSG = 'Align the parameters of a method call if they span ' +
          'more than one line.'

        def on_send(node)
          _receiver, method, *args = *node

          return if method == :[]=
          return if args.size <= 1

          first_arg_column = args.first.loc.expression.column

          args.each_cons(2) do |prev, current|
            current_pos = current.loc.expression

            if current_pos.line > prev.loc.expression.line &&
                current_pos.column != first_arg_column
              @column_delta = first_arg_column - current_pos.column
              convention(current, current_pos)
            end
          end
        end

        def autocorrect_action(node)
          # We can't use the instance variable inside the lambda. That would
          # just give each lambda the same reference and they would all get
          # the last value of @column_delta. A local variable fixes the
          # problem.
          column_delta = @column_delta

          @corrections << lambda do |corrector|
            expr = node.loc.expression
            if column_delta > 0
              corrector.replace(expr, ' ' * column_delta + expr.source)
            else
              range = Parser::Source::Range.new(expr.source_buffer,
                                                expr.begin_pos + column_delta,
                                                expr.end_pos)
              corrector.replace(range, expr.source)
            end
          end
        end
      end
    end
  end
end

Version data entries

1 entries across 1 versions & 1 rubygems

Version	Path
rubocop-0.13.0	lib/rubocop/cop/style/align_parameters.rb