13cd04d9be
* Add Mutant::AST namespace to hold all AST related data / helpers. * Mutant::AST will be externalized into an ast-meta gem that can be shared with unparser for deduplication. * Over the time the mutators itself will not need to deal with semantic analysis of the AST anymore by themselves. * Move AST analysis for send nodes to AST::Meta * Fix #209
159 lines
3.6 KiB
Ruby
159 lines
3.6 KiB
Ruby
module Mutant
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class Mutator
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class Node
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# Namespace for send mutators
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class Send < self
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include AST::Types
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handle(:send)
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children :receiver, :selector
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SELECTOR_REPLACEMENTS = IceNine.deep_freeze(
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reverse_map: [:map, :each],
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reverse_each: [:each],
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map: [:each],
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send: [:public_send],
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gsub: [:sub],
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eql?: [:equal?],
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:== => [:eql?, :equal?]
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)
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private
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# Perform dispatch
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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_singletons
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if meta.index_assignment?
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run(Index::Assign)
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else
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non_index_dispatch
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end
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end
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# Perform non index dispatch
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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 non_index_dispatch
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case
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when meta.binary_method_operator?
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run(Binary)
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when meta.attribute_assignment?
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run(AttributeAssignment)
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else
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normal_dispatch
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end
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end
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# Return arguments
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#
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# @return [Enumerable<Parser::AST::Node>]
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#
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# @api private
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#
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alias_method :arguments, :remaining_children
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# Perform normal, non special case dispatch
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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 normal_dispatch
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emit_naked_receiver
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emit_selector_replacement
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emit_argument_propagation
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mutate_receiver
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mutate_arguments
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end
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# Emit selector replacement
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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_selector_replacement
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SELECTOR_REPLACEMENTS.fetch(selector, EMPTY_ARRAY).each do |replacement|
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emit_selector(replacement)
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end
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end
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# Emit naked receiver mutation
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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_naked_receiver
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emit(receiver) if receiver && !NOT_ASSIGNABLE.include?(receiver.type)
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end
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# Mutate arguments
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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_arguments
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emit_type(receiver, selector)
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remaining_children_with_index.each do |_node, index|
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mutate_child(index)
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delete_child(index)
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end
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end
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# Emit argument propagation
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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_argument_propagation
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node = arguments.first
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emit(node) if arguments.one? && !NOT_STANDALONE.include?(node.type)
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end
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# Emit receiver 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_receiver
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return unless receiver
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emit_implicit_self
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emit_receiver_mutations do |node|
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!n_nil?(node)
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end
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end
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# Emit implicit self mutation
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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_implicit_self
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emit_receiver(nil) if n_self?(receiver) && !(
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KEYWORDS.include?(selector) ||
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METHOD_OPERATORS.include?(selector) ||
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OP_ASSIGN.include?(parent_type) ||
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meta.attribute_assignment?
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)
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end
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end # Send
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end # Node
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end # Mutator
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end # Mutant
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