Class: Operator::MutationAlteringCore

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

Overview

Common functionality for MutationBitNodal, MutationBitStructural, MutationNodal and MutationStructural classes.

Direct Known Subclasses

MutationAltering, MutationBitAltering

Instance Attribute Summary (collapse)

Instance Method Summary (collapse)

Constructor Details

- (MutationAlteringCore) initialize(grammar)

See a subclass description. 



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# File '../lib/mutation_altering.rb', line 10

def initialize( grammar )
  @grammar = grammar
  @random = Kernel
  @offset = 0
end

Instance Attribute Details

- (Object) offset

Offset which is added to the index of the mutated codon’s position. This is useful for Mapper::*Locus mappers where the odd codons encode a location choices and even codons encode rule choices. 



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# File '../lib/mutation_altering.rb', line 30

def offset
  @offset
end

Instance Method Details

- (Object) mutation(orig, track)

See a subclass description. 



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# File '../lib/mutation_altering.rb', line 17

def mutation( orig, track )
  mutant = orig.clone
  filtered_track = track.find_all { |node| @grammar[ node.symbol ].sn_altering == filter }
  return mutant if filtered_track.empty?
  where = @random.rand( filtered_track.size )
  index = ( filtered_track[where].from + @offset ).divmod( mutant.size ).last
  mutant[ index ] = get_codon_value( mutant, index )
  mutant
end