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/usr/lib/ruby/vendor_ruby/chef_zero/solr/query/term.rb is in chef-zero 4.5.0-2.

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require 'chef_zero/solr/query/regexpable_query'

module ChefZero
  module Solr
    module Query
      class Term < RegexpableQuery
        def initialize(term)
          # Get rid of escape characters, turn * and ? into .* and . for regex, and
          # escape everything that needs escaping
          literal_string = ""
          regexp_string = ""
          index = 0
          while index < term.length
            if term[index] == '*'
              regexp_string << "#{WORD_CHARACTER}*"
              literal_string = nil
              index += 1
            elsif term[index] == '?'
              regexp_string << WORD_CHARACTER
              literal_string = nil
              index += 1
            elsif term[index] == '~'
              raise "~ unsupported"
            else
              if term[index] == '\\'
                index = index+1
                if index >= term.length
                  raise "Backslash at end of string '#{term}'"
                end
              end
              literal_string << term[index] if literal_string
              regexp_string << Regexp.escape(term[index])
              index += 1
            end
          end
          super(regexp_string, literal_string)
        end

        def to_s
          "Term(#{regexp_string})"
        end
      end
    end
  end
end