Class: GentleBrute::Odometer

Inherits:
Object
  • Object
show all
Defined in:
lib/gentle_brute/odometer.rb

Instance Method Summary collapse

Constructor Details

#initialize(start_length = 1, heuristic = true) ⇒ Odometer

Returns a new instance of Odometer.



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# File 'lib/gentle_brute/odometer.rb', line 3

def initialize(start_length=1, heuristic=true)
  @letters = ('a'..'z').to_a
  @chars = @letters + [" ", "'"]
  @odometer = Array.new(start_length, 0)
  @heuristic = heuristic
  @cpa_analyzer = CPAAnalyzer.new
end

Instance Method Details

#has_triple_char_pattern? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/gentle_brute/odometer.rb', line 11

def has_triple_char_pattern?
  return false if not @heuristic
  indexes = []
  odometer_length = @odometer.length
  (odometer_length-1).downto 0 do | i |
    index = @odometer[i]
    if indexes.length > 0
      char1 = @chars[index] # figure out what char the current index is
      char2 = @chars[@odometer[indexes[0]]] # get the char of our first element in the indexes list
      indexes = [] if char1 != char2
    end
    indexes << i
    break if indexes.length == 3
  end
  return false if indexes.length < 3
  true
end

#increment(total_steps = 1) ⇒ Object

Increment the odometer

Parameters:

  • total_steps (Number) (defaults to: 1) —

    the number of steps to increment the odometer by (default is 1)



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# File 'lib/gentle_brute/odometer.rb', line 137

def increment(total_steps=1)
  steps_taken = 0
  while steps_taken < total_steps
    odometer_length = @odometer.length
    (odometer_length-1).downto 0 do | i |
      element = @odometer[i]
      element += 1
      if element != @chars.length
        @odometer[i] = element
        break
      end
      @odometer[i] = 0
      @odometer << 0 if i == 0
    end
    rotate_out_bad_end_pairs
    rotate_out_bad_start_pairs
    next if has_triple_char_pattern?
    steps_taken += 1
  end
end

#rotate_out_bad_end_pairs ⇒ Object 



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# File 'lib/gentle_brute/odometer.rb', line 92

def rotate_out_bad_end_pairs
  return if not @heuristic

  return if @odometer.length < 3

  char1 = @chars[@odometer[-1]]
  char2 = @chars[@odometer[-2]]
  char3 = @chars[@odometer[-3]]
  return if not @letters.include? char1
  return if not @letters.include? char2
  return if not @letters.include? char3

  last = @odometer.length-1

  if @cpa_analyzer.get_ender_neighbor_score(char1, char3)[1] == 0
    last.downto 0 do | i |
      element = @odometer[i]
      element += 1
      if element != @chars.length
        @odometer[i] = element
        break
      end
      @odometer[i] = 0
      @odometer << 0 if i == 0
    end
    rotate_out_bad_end_pairs
  end

  if @cpa_analyzer.get_ender_neighbor_score(char1, char2)[0] == 0
    last.downto 0 do | i |
      element = @odometer[i]
      element += 1
      if element != @chars.length
        @odometer[i] = element
        break
      end
      @odometer[i] = 0
      @odometer << 0 if i == 0
    end
    rotate_out_bad_end_pairs
  end
end

#rotate_out_bad_start_pairs ⇒ Object

def break_up_triplet_patterns

return if not @heuristic

word = string_for_odometer
pattern_data = PatternFinder.patterns_in_strintg word
return if pattern_data == nil
return if pattern_data[3] < 3

index = pattern_data[4][1]
index.downto 0 do | i |
  element = @odometer[i]
  element += 1
  if element != @chars.length
    @odometer[i] = element
    break
  end
  @odometer[i] = 0
  @odometer << 0 if i == 0
end

break_up_triplet_patterns

end



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# File 'lib/gentle_brute/odometer.rb', line 52

def rotate_out_bad_start_pairs
  return if not @heuristic
  return if @odometer.length < 3

  char1 = @chars[@odometer[0]]
  char2 = @chars[@odometer[1]]
  char3 = @chars[@odometer[2]]
  return if not @letters.include? char1
  return if not @letters.include? char2
  return if not @letters.include? char3

  if @cpa_analyzer.get_starter_neighbor_score(char1, char3)[1] == 0
    2.downto 0 do | i |
      element = @odometer[i]
      element += 1
      if element != @chars.length
        @odometer[i] = element
        break
      end
      @odometer[i] = 0
      @odometer << 0 if i == 0
    end
    rotate_out_bad_start_pairs
  end

  if @cpa_analyzer.get_starter_neighbor_score(char1, char2)[0] == 0
    1.downto 0 do | i |
      element = @odometer[i]
      element += 1
      if element != @chars.length
        @odometer[i] = element
        break
      end
      @odometer[i] = 0
      @odometer << 0 if i == 0
    end
    rotate_out_bad_start_pairs
  end
end

#string_for_odometer ⇒ String

Returns string representation of the odometer, with character indexes mapped to their respective characters.

Returns:

  • (String) —

    string representation of the odometer, with character indexes mapped to their respective characters



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# File 'lib/gentle_brute/odometer.rb', line 159

def string_for_odometer
  return @odometer.map {|i| @chars[i]}.join ""
end

#to_s ⇒ Object 



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# File 'lib/gentle_brute/odometer.rb', line 163

def to_s
  string_for_odometer
end