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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop looks for *unless* expressions with *else* clauses.
#
# @example
# # bad
# unless foo_bar.nil?
# # do something...
# else
# # do a different thing...
# end
#
# # good
# if foo_bar.present?
# # do something...
# else
# # do a different thing...
# end
class UnlessElse < Cop
include RangeHelp
MSG = 'Do not use `unless` with `else`. Rewrite these with the ' \
'positive case first.'.freeze
def on_if(node)
return unless node.unless? && node.else?
add_offense(node)
end
def autocorrect(node)
condition, = *node
body_range = range_between_condition_and_else(node, condition)
else_range = range_between_else_and_end(node)
lambda do |corrector|
corrector.replace(node.loc.keyword, 'if'.freeze)
corrector.replace(body_range, else_range.source)
corrector.replace(else_range, body_range.source)
end
end
def range_between_condition_and_else(node, condition)
range_between(condition.source_range.end_pos, node.loc.else.begin_pos)
end
def range_between_else_and_end(node)
range_between(node.loc.else.end_pos, node.loc.end.begin_pos)
end
end
end
end
end
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