Module: Wordmap::Builder

Defined in:
lib/wordmap/builder.rb

Class Method Summary collapse

Class Method Details

.build_vectors(hash) ⇒ Object 



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# File 'lib/wordmap/builder.rb', line 7

def build_vectors(hash)
  vectors = hash.first[0].is_a?(Array) ? hash.keys.transpose : [hash.keys]
  vectors.map!(&:uniq)
  vectors.map!(&:sort)
  vectors
end

.rjust_bytes(string, bytesize, spacer) ⇒ Object 



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# File 'lib/wordmap/builder.rb', line 44

def rjust_bytes(string, bytesize, spacer)
  difference = bytesize - string.bytesize
  (spacer * difference) + string
end

.write_data(path, vecs, cells_c, hash, spacer) ⇒ Object

TODO: drop null bytes at the beginning (offset in meta) TODO: drop null bytes at the end



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# File 'lib/wordmap/builder.rb', line 16

def write_data(path, vecs, cells_c, hash, spacer)
  File.open("#{path}/data", 'wb') do |file|
    cell_w = hash.values.max_by(&:bytesize).bytesize
    file.write("#{cell_w},#{cells_c}#{spacer}")

    key_iterator =
      vecs.size == 1 ? vecs[0].each : vecs[0].product(*vecs[1..-1]).to_enum

    key_iterator.with_index do |key, cell_i|
      value = hash[key].to_s
      yield(key, value, cell_i) unless value.empty?
      file.write(rjust_bytes(value, cell_w, spacer))
    end
  end
end

.write_vector(path, vector, spacer) ⇒ Object 



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# File 'lib/wordmap/builder.rb', line 32

def write_vector(path, vector, spacer)
  cell_w = vector.max_by(&:bytesize).bytesize

  File.open(path, 'wb') do |file|
    file.write("#{cell_w},#{vector.size}#{spacer}")

    vector.each do |key|
      file.write(rjust_bytes(key.to_s, cell_w, spacer))
    end
  end
end