59 lines
1 KiB
Ruby
59 lines
1 KiB
Ruby
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# encoding: utf-8
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module Mutant
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class Mutator
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class Node
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# Mutation emitter to handle binary connectives
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class Binary < self
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INVERSE = {
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and: :or,
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or: :and
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}.freeze
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handle(*INVERSE.keys)
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children :left, :right
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private
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# Emit mutations
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#
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# @return [undefined]
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#
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# @api private
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#
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def dispatch
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emit_nil
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emit(left)
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emit(right)
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mutate_operator
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mutate_operands
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end
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# Emit operator mutations
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#
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# @return [undefined]
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#
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# @api private
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#
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def mutate_operator
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emit(s(INVERSE.fetch(node.type), left, right))
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end
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# Emit condition mutations
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#
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# @return [undefined]
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#
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# @api private
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#
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def mutate_operands
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emit(s(node.type, n_not(left), right))
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emit(n_not(node))
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end
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end # Binary
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end # Node
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end # Mutator
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end # Mutant
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