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# frozen_string_literal: true
module RuboCop
module Cop
module Lint
# This cop checks for nested percent literals.
#
# @example
#
# # bad
#
# # The percent literal for nested_attributes is parsed as four tokens,
# # yielding the array [:name, :content, :"%i[incorrectly", :"nested]"].
# attributes = {
# valid_attributes: %i[name content],
# nested_attributes: %i[name content %i[incorrectly nested]]
# }
class NestedPercentLiteral < Cop
include PercentLiteral
MSG = 'Within percent literals, nested percent literals do not ' \
'function and may be unwanted in the result.'.freeze
# The array of regular expressions representing percent literals that,
# if found within a percent literal expression, will cause a
# NestedPercentLiteral violation to be emitted.
PERCENT_LITERAL_TYPES = PreferredDelimiters::PERCENT_LITERAL_TYPES
REGEXES = PERCENT_LITERAL_TYPES.map do |percent_literal|
/\A#{percent_literal}\W/
end.freeze
def on_array(node)
process(node, *PERCENT_LITERAL_TYPES)
end
def on_percent_literal(node)
add_offense(node) if contains_percent_literals?(node)
end
private
def contains_percent_literals?(node)
node.each_child_node.any? do |child|
literal = child.children.first.to_s.scrub
REGEXES.any? { |regex| literal.match(regex) }
end
end
end
end
end
end
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