Module: Wordmap::IndexValue

Defined in:
lib/wordmap/index_value.rb

Class Method Summary collapse

Class Method Details

.combine(*arrays_of_iters) ⇒ Object 



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# File 'lib/wordmap/index_value.rb', line 31

def combine(*arrays_of_iters)
  return enum_for(__method__, *arrays_of_iters) unless block_given?
  intersect(*arrays_of_iters.map { |array| uniq_union(*array) }) do |value|
    yield(value)
  end
end

.each_seq_value(*arrays_of_seqs) ⇒ Object 



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# File 'lib/wordmap/index_value.rb', line 17

def each_seq_value(*arrays_of_seqs)
  return enum_for(__method__, *arrays_of_seqs) unless block_given?

  iters = arrays_of_seqs.map { |union_array|
    case union_array
    when Enumerator; [union_array]
    when String; [iterator(union_array)]
    else; union_array.map { |seq| iterator(seq) }
    end
  }

  combine(*iters) { |value| yield(value) }
end

.intersect(*iters) ⇒ Object 



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# File 'lib/wordmap/index_value.rb', line 38

def intersect(*iters)
  return enum_for(__method__, *iters) unless block_given?

  last = nil
  given = 0
  wrap_up = false

  union(*iters, control_messages: true) do |value|
    if value == :__iter_exhausted
      wrap_up = true
      next
    end

    break if wrap_up && last != value

    last == value ? (given += 1) : (given = 1)
    yield(value) if given == iters.size
    last = value
  end
end

.iterator(value) ⇒ Object 



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# File 'lib/wordmap/index_value.rb', line 103

def iterator(value)
  return enum_for(__method__, value) unless block_given?

  last = 0

  value.enum_for(:scan, /[\d\+]+/).each do |seq|
    n, extra = seq.split('+').map(&:to_i)
    v1 = last + n

    if extra
      v2 = (v1 + extra)
      (v1..v2).each { |i| yield(i) }
      last = v2
    else
      yield(v1)
      last = v1
    end
  end
end

.pack(numbers) ⇒ Object 



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

def pack(numbers)
  last = 0

  numbers
    .slice_when { |a, b| b > a.succ }
    .map { |h, *t| [h - last, t.size].tap { last = t.last || h } }
    .map { |v, r| r.zero? ? v.to_s : "#{v}+#{r}" }
    .join(',')
end

.union(*iters, control_messages: false) ⇒ Object 



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# File 'lib/wordmap/index_value.rb', line 70

def union(*iters, control_messages: false)
  unless block_given?
    return enum_for(__method__, *iters, control_messages: control_messages)
  end

  iters = iters.map { |iter| [iter.rewind, true] }

  loop do
    iter_exhausted = false

    next_iter =
      iters.select { |iter| iter[1] }.min_by do |iter|
        begin
          iter[0].peek
        rescue StopIteration
          iter[1] = false
          iter_exhausted = true
          next(Float::INFINITY)
        end
      end

    all_iters_exhausted = iters.none? { |iter| iter[1] }

    if control_messages && iter_exhausted && !all_iters_exhausted
      yield(:__iter_exhausted)
    end

    value = next_iter[0].next
    yield(value)
    break if all_iters_exhausted
  end
end

.uniq_union(*iters) ⇒ Object 



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# File 'lib/wordmap/index_value.rb', line 59

def uniq_union(*iters)
  return enum_for(__method__, *iters) unless block_given?

  last = nil

  union(*iters) do |value|
    yield(value) unless value == last
    last = value
  end
end