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Contents
# frozen_string_literal: true
module RuboCop
module Cop
module Style
# This cop checks for nested ternary op expressions.
#
# @example
# # bad
# a ? (b ? b1 : b2) : a2
#
# # good
# if a
# b ? b1 : b2
# else
# a2
# end
class NestedTernaryOperator < Base
extend AutoCorrector
MSG = 'Ternary operators must not be nested. Prefer `if` or `else` constructs instead.'
def on_if(node)
return unless node.ternary?
node.each_descendant(:if).select(&:ternary?).each do |nested_ternary|
add_offense(nested_ternary) do |corrector|
if_node = if_node(nested_ternary)
corrector.replace(if_node, <<~RUBY.chop)
if #{if_node.condition.source}
#{remove_parentheses(if_node.if_branch.source)}
else
#{if_node.else_branch.source}
end
RUBY
end
end
end
private
def if_node(node)
node = node.parent
return node if node.if_type?
if_node(node)
end
def remove_parentheses(source)
return source unless source.start_with?('(')
source.delete_prefix('(').delete_suffix(')')
end
end
end
end
end
Version data entries
38 entries across 38 versions & 6 rubygems