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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# If the `else` branch of a conditional consists solely of an `if` node,
# it can be combined with the `else` to become an `elsif`.
# This helps to keep the nesting level from getting too deep.
#
# @example
# # bad
# if condition_a
# action_a
# else
# if condition_b
# action_b
# else
# action_c
# end
# end
#
# # good
# if condition_a
# action_a
# elsif condition_b
# action_b
# else
# action_c
# end
#
# @example AllowIfModifier: false (default)
# # bad
# if condition_a
# action_a
# else
# action_b if condition_b
# end
#
# # good
# if condition_a
# action_a
# elsif condition_b
# action_b
# end
#
# @example AllowIfModifier: true
# # good
# if condition_a
# action_a
# else
# action_b if condition_b
# end
#
# # good
# if condition_a
# action_a
# elsif condition_b
# action_b
# end
#
class IfInsideElse < Cop
MSG = 'Convert `if` nested inside `else` to `elsif`.'
def on_if(node)
return if node.ternary? || node.unless?
else_branch = node.else_branch
return unless else_branch&.if_type? && else_branch&.if?
return if allow_if_modifier_in_else_branch?(else_branch)
add_offense(else_branch, location: :keyword)
end
private
def allow_if_modifier_in_else_branch?(else_branch)
allow_if_modifier? && else_branch&.modifier_form?
end
def allow_if_modifier?
cop_config['AllowIfModifier']
end
end
end
end
end
Version data entries
52 entries across 33 versions & 5 rubygems