Module: Factbase::IndexedTerm

Defined in:
lib/factbase/indexed/indexed_term.rb

Overview

Term with an index.

Author

Yegor Bugayenko ([email protected])

Copyright

Copyright © 2024-2025 Yegor Bugayenko

License

MIT

Instance Method Summary collapse

Instance Method Details

#predict(maps, params) ⇒ Object 



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# File 'lib/factbase/indexed/indexed_term.rb', line 14

def predict(maps, params)
  case @op
  when :eq
    if @operands[0].is_a?(Symbol) && _scalar?(@operands[1])
      key = [maps.object_id, @operands[0], @op]
      if @idx[key].nil?
        @idx[key] = {}
        maps.to_a.each do |m|
          m[@operands[0].to_s]&.each do |v|
            @idx[key][v] = [] if @idx[key][v].nil?
            @idx[key][v].append(m)
          end
        end
      end
      vv =
        if @operands[1].is_a?(Symbol)
          sym = @operands[1].to_s.gsub(/^\$/, '')
          params[sym] || []
        else
          [@operands[1]]
        end
      vv.map { |v| @idx[key][v] || [] }.reduce(&:|)
    else
      maps.to_a
    end
  when :and
    parts = @operands.map { |o| o.predict(maps, params) }
    if parts.include?(nil)
      maps
    else
      parts.reduce(&:&)
    end
  when :or
    @operands.map { |o| o.predict(maps, params) }.reduce(&:|)
  when :join, :as
    nil
  else
    maps.to_a
  end
end