Class: Henitai::SurvivorSelector

Inherits:
Object
  • Object
show all
Defined in:
lib/henitai/survivor_selector.rb

Overview

Filters a mutant list to those that match a set of prior survivor stable IDs.

After calling #select, #unmatched_ids reports which survivor IDs had no corresponding mutant in the current generation. A high unmatched ratio indicates that the source has drifted and a full run is recommended.

Defined Under Namespace

Classes: SelectionError

Constant Summary collapse

DRIFT_THRESHOLD = 
0.5

Instance Method Summary collapse

Constructor Details

#initialize(survivor_ids:) ⇒ SurvivorSelector

Returns a new instance of SurvivorSelector.



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# File 'lib/henitai/survivor_selector.rb', line 13

def initialize(survivor_ids:)
  @survivor_ids  = survivor_ids.to_set
  @unmatched_ids = nil
end

Instance Method Details

#drift_warning? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/henitai/survivor_selector.rb', line 30

def drift_warning?
  return false if @survivor_ids.empty?

  unmatched_ids.size.to_f / @survivor_ids.size > DRIFT_THRESHOLD
end

#select(mutants) ⇒ Object 



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# File 'lib/henitai/survivor_selector.rb', line 18

def select(mutants)
  current_index = mutants.to_h { |m| [m.stable_id, m] }
  matched_ids, @unmatched_ids = @survivor_ids.partition { |id| current_index.key?(id) }
  matched_ids.filter_map { |id| current_index[id] }
end

#unmatched_ids ⇒ Object

Raises:



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# File 'lib/henitai/survivor_selector.rb', line 24

def unmatched_ids
  raise SelectionError, "Call #select before accessing #unmatched_ids" if @unmatched_ids.nil?

  @unmatched_ids
end