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Contents
# encoding: utf-8
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# Checks for uses of if with a negated condition. Only ifs
# without else are considered.
class NegatedIf < Cop
include NegativeConditional
MSG = 'Favor `%s` over `%s` for negative conditions.'.freeze
def on_if(node)
return unless node.loc.respond_to?(:keyword)
return if node.loc.keyword.is?('elsif')
check_negative_conditional(node)
end
def message(node)
if node.loc.keyword.is?('if')
format(MSG, 'unless', 'if')
else
format(MSG, 'if', 'unless')
end
end
private
def autocorrect(node)
lambda do |corrector|
condition, _body, _rest = *node
# look inside parentheses around the condition
condition = condition.children.first while condition.type == :begin
# unwrap the negated portion of the condition (a send node)
pos_condition, _method, = *condition
corrector.replace(
node.loc.keyword,
node.loc.keyword.is?('if') ? 'unless' : 'if'
)
corrector.replace(condition.source_range, pos_condition.source)
end
end
end
end
end
end
Version data entries
13 entries across 13 versions & 2 rubygems