class RuboCop::Cop::Layout::SpaceInLambdaLiteral

This cop 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

autocorrect(lambda_node) click to toggle source
# File lib/rubocop/cop/layout/space_in_lambda_literal.rb, line 45
def autocorrect(lambda_node)
  children = lambda_node.parent.children
  lambda do |corrector|
    if style == :require_space
      corrector.insert_before(children[1].source_range, ' ')
    else
      space_range = range_between(children[0].source_range.end_pos,
                                  children[1].source_range.begin_pos)
      corrector.remove(space_range)
    end
  end
end
on_send(node) click to toggle source
# File lib/rubocop/cop/layout/space_in_lambda_literal.rb, line 31
def on_send(node)
  return unless arrow_lambda_with_args?(node)

  if style == :require_space && !space_after_arrow?(node)
    add_offense(node,
                location: range_of_offense(node),
                message: MSG_REQUIRE_SPACE)
  elsif style == :require_no_space && space_after_arrow?(node)
    add_offense(node,
                location: range_of_offense(node),
                message: MSG_REQUIRE_NO_SPACE)
  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 60
def arrow_lambda_with_args?(node)
  node.lambda_literal? && node.parent.arguments?
end
range_of_offense(node) click to toggle source
# File lib/rubocop/cop/layout/space_in_lambda_literal.rb, line 71
def range_of_offense(node)
  range_between(
    node.parent.loc.expression.begin_pos,
    node.parent.arguments.loc.expression.end_pos
  )
end
space_after_arrow?(lambda_node) click to toggle source
# File lib/rubocop/cop/layout/space_in_lambda_literal.rb, line 64
def space_after_arrow?(lambda_node)
  arrow = lambda_node.parent.children[0]
  parentheses = lambda_node.parent.children[1]
  (parentheses.source_range.begin_pos - arrow.source_range.end_pos)
    .positive?
end