class RuboCop::Cop::Layout::SpaceInLambdaLiteral

Checks for spaces between ‘->` and opening parameter parenthesis (`(`) in lambda literals.

@example EnforcedStyle: require_no_space (default)

# bad
a = -> (x, y) { x + y }

# good
a = ->(x, y) { x + y }

@example EnforcedStyle: require_space

# bad
a = ->(x, y) { x + y }

# good
a = -> (x, y) { x + y }

Constants

MSG_REQUIRE_NO_SPACE
MSG_REQUIRE_SPACE

Public Instance Methods

on_send(node) click to toggle source
# File lib/rubocop/cop/layout/space_in_lambda_literal.rb, line 30
def on_send(node)
  return unless arrow_lambda_with_args?(node)

  if style == :require_space && !space_after_arrow?(node)
    lambda_node = range_of_offense(node)

    add_offense(lambda_node, message: MSG_REQUIRE_SPACE) do |corrector|
      corrector.insert_before(lambda_arguments(node), ' ')
    end
  elsif style == :require_no_space && space_after_arrow?(node)
    space = space_after_arrow(node)

    add_offense(space, message: MSG_REQUIRE_NO_SPACE) do |corrector|
      corrector.remove(space)
    end
  end
end

Private Instance Methods

arrow_lambda_with_args?(node) click to toggle source
# File lib/rubocop/cop/layout/space_in_lambda_literal.rb, line 50
def arrow_lambda_with_args?(node)
  node.lambda_literal? && node.parent.arguments?
end
lambda_arguments(node) click to toggle source
# File lib/rubocop/cop/layout/space_in_lambda_literal.rb, line 72
def lambda_arguments(node)
  node.parent.children[1]
end
range_of_offense(node) click to toggle source
# File lib/rubocop/cop/layout/space_in_lambda_literal.rb, line 65
def range_of_offense(node)
  range_between(
    node.parent.source_range.begin_pos,
    node.parent.arguments.source_range.end_pos
  )
end
space_after_arrow(lambda_node) click to toggle source
# File lib/rubocop/cop/layout/space_in_lambda_literal.rb, line 58
def space_after_arrow(lambda_node)
  arrow = lambda_node.parent.children[0].source_range
  parentheses = lambda_node.parent.children[1].source_range

  arrow.end.join(parentheses.begin)
end
space_after_arrow?(lambda_node) click to toggle source
# File lib/rubocop/cop/layout/space_in_lambda_literal.rb, line 54
def space_after_arrow?(lambda_node)
  !space_after_arrow(lambda_node).empty?
end