72 lines
1.3 KiB
Ruby
72 lines
1.3 KiB
Ruby
module Mutant
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class Matcher
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class Method
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# Visitor to find last match inside AST
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class Finder
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# Run finder
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#
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# @param [Parser::AST::Node]
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#
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# @return [Parser::AST::Node]
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# if found
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#
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# @return [nil]
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# otherwise
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#
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# @api private
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#
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#
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def self.run(root, &predicate)
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new(root, predicate).match
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end
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private_class_method :new
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# Return match
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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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attr_reader :match
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private
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# Initialize object
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#
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# @param [Parer::AST::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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#
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def initialize(root, predicate)
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@root, @predicate = root, predicate
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visit(root)
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end
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# Visit node
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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 visit(node)
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if @predicate.call(node)
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@match = node
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end
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node.children.each do |child|
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visit(child) if child.kind_of?(Parser::AST::Node)
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end
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end
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end # Finder
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end # Method
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end # Matcher
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end # Mutant
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