149 lines
3.2 KiB
Ruby
149 lines
3.2 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
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# Return identity of node
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#
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# @param [Rubinius::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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ToSource.to_source(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 [Rubinius::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 [Rubinius::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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# Emit a new AST node
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#
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# @param [Rubinis::AST::Node:Class] node_class
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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 emit_node(node_class, *arguments)
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emit(new(node_class, *arguments))
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end
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# Create a new AST node with same class as wrapped 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 new_self(*arguments)
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new(node.class, *arguments)
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end
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# Create a new AST node with Rubnius::AST::NilLiteral class
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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 new_nil
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new(Rubinius::AST::NilLiteral)
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end
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# Create a new AST node with the same line as wrapped node
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#
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# @param [Class:Rubinius::AST::Node] node_class
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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 new(node_class, *arguments)
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node_class.new(node.line, *arguments)
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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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# @return [undefined]
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#
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# @api private
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#
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def emit_self(*arguments)
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emit(new_self(*arguments))
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end
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# Emit body mutations
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#
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# @param [Symbol] name
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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_attribute_mutations(name, mutator = Mutator)
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value = node.public_send(name)
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mutator.each(value) do |mutation|
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dup = dup_node
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dup.public_send(:"#{name}=", mutation)
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yield dup if block_given?
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emit(dup)
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end
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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(new_nil)
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end
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# Return AST representing send
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#
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# @param [Rubinius::AST::Node] receiver
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# @param [Symbol] name
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# @param [Rubinius::AST::Node] arguments
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#
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# @return [Rubnius::AST::SendWithArguments]
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#
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# @api private
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#
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def new_send(receiver, name, arguments=nil)
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if arguments
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new(Rubinius::AST::SendWithArguments, receiver, name, arguments)
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else
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new(Rubinius::AST::Send, receiver, name)
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end
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end
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# Return duplicated (unfrozen) node each call
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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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alias_method :dup_node, :dup_input
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end
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end
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end
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