130 lines
2.9 KiB
Ruby
130 lines
2.9 KiB
Ruby
module Mutant
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class Mutator
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class Node
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# Mutator for Rubinius::AST::If nodes
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class If < self
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handle(Rubinius::AST::If)
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private
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# Emit mutations on Rubinius::AST::If nodes
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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_attribute_mutations(:condition)
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emit_attribute_mutations(:body) unless nil_literal?(:body)
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emit_attribute_mutations(:else) unless nil_literal?(:else)
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emit_inverted_condition
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emit_deleted_if_branch
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emit_deleted_else_branch
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emit_true_if_branch
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emit_false_if_branch
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end
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# Test if attribute is non nil literal
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#
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# @param [Symbol] name
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#
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# @return [true]
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# if attribute value a nil literal
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#
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# @return [false]
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# otherwise
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#
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# @api private
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#
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def nil_literal?(name)
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node.public_send(name).kind_of?(Rubinius::AST::NilLiteral)
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end
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# Emit inverted condition
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#
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# Especially the same like swap branches but more universal as it also
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# covers the case there is no else branch
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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 emit_inverted_condition
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emit_self(new_send(condition, :'!'), if_branch, else_branch)
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end
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# Emit deleted else branch
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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 emit_deleted_else_branch
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emit_self(condition, if_branch, nil)
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end
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# Emit deleted if branch
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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 emit_deleted_if_branch
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body = else_branch || return
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emit_self(condition, body, nil)
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end
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# Emit true if branch
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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 emit_true_if_branch
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emit_self(new(Rubinius::AST::TrueLiteral), if_branch, else_branch)
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end
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# Emit false if branch
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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 emit_false_if_branch
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emit_self(new(Rubinius::AST::FalseLiteral), if_branch, else_branch)
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end
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# Return if_branch of node
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#
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# @return [Rubinius::AST::Node]
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#
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# @api private
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#
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def if_branch
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node.body
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end
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# Return condition of node
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#
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# @return [Rubinius::AST::Node]
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#
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# @api private
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#
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def condition
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node.condition
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end
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# Return else body of node
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#
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# @return [Rubinius::AST::Node]
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#
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# @api private
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#
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def else_branch
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node.else
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end
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end
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end
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end
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end
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