101 lines
2 KiB
Ruby
101 lines
2 KiB
Ruby
module Mutant
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# Generator for mutations
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class Mutator
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# Abstract base class for node mutators
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class Node < self
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include AbstractType, NodeHelpers
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# Return identity of node
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#
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# @param [Parser::AST::Node] node
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#
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# @return [String]
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#
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# @api private
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#
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def self.identity(node)
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Unparser.unparse(node)
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end
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private
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# Return mutated node
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#
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# @return [Parser::AST::Node]
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#
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# @api private
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#
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alias_method :node, :input
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# Return duplicated node
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#
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# @return [Parser::AST::Node]
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#
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# @api private
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#
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alias_method :dup_node, :dup_input
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# Return children
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#
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# @return [Array<Parser::AST::Node>]
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#
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# @api private
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#
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def children
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node.children
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end
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# Dispatch on child index
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#
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# @param [Fixnum] index
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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_child(index, mutator = Mutator)
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children = node.children
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child = children[index]
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mutator.each(child) do |mutation|
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emit_child_update(index, mutation)
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end
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end
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# Emit updated child
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#
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# @param [Fixnum] index
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# @param [Object] update
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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_child_update(index, update)
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new_children = children.dup
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new_children[index]=update
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emit_self(new_children)
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end
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# Emit a new AST node with same class as wrapped node
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#
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# @param [Array<Parser::AST::Node>] children
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#
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# @api private
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#
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def emit_self(children)
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emit(Parser::AST::Node.new(node.type, children))
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end
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# Emit a new AST node with NilLiteral class
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#
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# @return [Rubinius::AST::NilLiteral]
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#
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# @api private
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#
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def emit_nil
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emit(s(:nil))
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end
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end # Node
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end # Mutator
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end # Mutant
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