lib/rubocop/cop/layout/space_before_first_arg.rb
# frozen_string_literal: true
module RuboCop
module Cop
module Layout
# Checks that exactly one space is used between a method name and the
# first argument for method calls without parentheses.
#
# Alternatively, extra spaces can be added to align the argument with
# something on a preceding or following line, if the AllowForAlignment
# config parameter is true.
#
# @example
# # bad
# something x
# something y, z
# something'hello'
#
# # good
# something x
# something y, z
# something 'hello'
#
class SpaceBeforeFirstArg < Base
include PrecedingFollowingAlignment
include RangeHelp
extend AutoCorrector
MSG = 'Put one space between the method name and the first argument.'
def self.autocorrect_incompatible_with
[Style::MethodCallWithArgsParentheses]
end
def on_send(node)
return unless regular_method_call_with_arguments?(node)
return if node.parenthesized?
first_arg = node.first_argument.source_range
first_arg_with_space = range_with_surrounding_space(first_arg, side: :left)
space = range_between(first_arg_with_space.begin_pos, first_arg.begin_pos)
return if space.length == 1
return unless expect_params_after_method_name?(node)
add_offense(space) { |corrector| corrector.replace(space, ' ') }
end
alias on_csend on_send
private
def regular_method_call_with_arguments?(node)
node.arguments? && !node.operator_method? && !node.setter_method?
end
def expect_params_after_method_name?(node)
return true if no_space_between_method_name_and_first_argument?(node)
first_arg = node.first_argument
same_line?(first_arg, node) &&
!(allow_for_alignment? && aligned_with_something?(first_arg.source_range))
end
def no_space_between_method_name_and_first_argument?(node)
end_pos_of_method_name = node.loc.selector.end_pos
begin_pos_of_argument = node.first_argument.source_range.begin_pos
end_pos_of_method_name == begin_pos_of_argument
end
end
end
end
end