52 lines
847 B
Ruby
52 lines
847 B
Ruby
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module Mutant
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# Walker for all ast nodes
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class Walker
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# Run walkter
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#
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# @param [Parser::AST::Node] root
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#
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# @return [self]
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#
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# @api private
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#
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def self.run(root, &block)
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new(root, block)
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self
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end
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private_class_method :new
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# Initialize and run walker
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#
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# @param [Parser::AST::Node] root
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# @param [#call(node)] block
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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 initialize(root, block)
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@root, @block = root, block
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dispatch(root)
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end
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private
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# Perform dispatch
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#
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# @param [Parser::AST::Node] 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 dispatch(node)
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@block.call(node)
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node.children.grep(Parser::AST::Node).each(&method(:dispatch))
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end
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end # Walker
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end # Mutant
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