yegor256/pdd

# Copyright (c) 2014-2024 Yegor Bugayenko
#
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# of this software and associated documentation files (the 'Software'), to deal
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#
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#
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# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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# SOFTWARE.

module PDD
  module Rule
    module Roles
      # Rule for available roles checking.
      class Available
        # Ctor.
        # +xml+:: XML with puzzles
        def initialize(xml, roles)
          @xml = xml
          @roles = roles.split(',')
        end

        def errors
          @xml.xpath('//puzzle').map do |p|
            role = p.xpath('role/text()').to_s
            next nil if @roles.include?(role)

            "puzzle #{p.xpath('file/text()')}:#{p.xpath('lines/text()')}" +
              if role.empty?
                " doesn't define any role" \
                  ", while one of these roles is required: #{@roles}"
              else
                " defines role #{role}" \
                  ", while only these roles are allowed: #{@roles}"
              end
          end.compact
        end
      end
    end
  end
end