Class: Henitai::Operators::EqualityOperator

Inherits:
Henitai::Operator show all
Defined in:
lib/henitai/operators/equality_operator.rb

Overview

Replaces relational/equality operators with the other relational operators.

Identity-method comparisons (eql?, equal?) are handled separately by EqualityIdentityOperator: that pairing is the hardest to kill in practice (most objects don't observably distinguish == from eql?/equal?), so it is kept out of the default light set.

Constant Summary collapse

NODE_TYPES = 
[:send].freeze
OPERATORS = 
%i[== != < > <= >= <=>].freeze

Constants inherited from Henitai::Operator

Henitai::Operator::FULL_SET, Henitai::Operator::HARD_SET, Henitai::Operator::LIGHT_SET, Henitai::Operator::SETS

Class Method Summary collapse

Instance Method Summary collapse

Methods inherited from Henitai::Operator

#build_mutant, for_set, #name, #node_location

Class Method Details

.node_types ⇒ Object 



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# File 'lib/henitai/operators/equality_operator.rb', line 17

def self.node_types
  NODE_TYPES
end

Instance Method Details

#mutate(node, subject:) ⇒ Object 



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# File 'lib/henitai/operators/equality_operator.rb', line 21

def mutate(node, subject:)
  method_name = node.children[1]
  return [] unless OPERATORS.include?(method_name)

  OPERATORS.each_with_object([]) do |replacement, mutants|
    next if replacement == method_name

    mutants << build_mutant(
      subject:,
      original_node: node,
      mutated_node: mutated_node(node, replacement),
      description: "replaced #{method_name} with #{replacement}"
    )
  end
end