103 lines
2.1 KiB
Ruby
103 lines
2.1 KiB
Ruby
module Mutant
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class Matcher
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class Method < self
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# A classifier for input strings
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class Classifier
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extend Immutable
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TABLE = {
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'.' => Matcher::Method::Singleton,
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'#' => Matcher::Method::Instance
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}.freeze
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SCOPE_FORMAT = /\A([^#.]+)(\.|#)(.+)\z/.freeze
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# Positions of captured regexp groups
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# Freezing fixnums to avoid their singleton classes are patched.
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CONSTANT_NAME_POSITION = 1.freeze
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SCOPE_SYMBOL_POSITION = 2.freeze
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METHOD_NAME_POSITION = 3.freeze
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private_class_method :new
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# Run classifier
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#
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# @param [String] input
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#
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# @return [Matcher::Method]
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#
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# @api private
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#
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def self.run(input)
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match = SCOPE_FORMAT.match(input)
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raise ArgumentError, "Cannot determine subject from #{input.inspect}" unless match
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new(match).matcher
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end
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public
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# Return method matcher
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#
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# @return [Matcher::Method]
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#
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# @api private
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#
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def matcher
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matcher_class.new(constant_name, method_name)
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end
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private
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# Initialize matcher
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#
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# @param [MatchData] match
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#
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# @api private
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#
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def initialize(match)
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@match = match
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end
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# Return constant name
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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 constant_name
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@match[CONSTANT_NAME_POSITION]
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end
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# Return method name
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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 method_name
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@match[METHOD_NAME_POSITION].to_sym
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end
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# Return scope symbol
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#
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# @return [Symbol]
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#
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# @api private
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#
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def scope_symbol
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@match[SCOPE_SYMBOL_POSITION]
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end
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# Return matcher class
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#
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# @return [Class<Matcher>]
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#
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# @api private
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#
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def matcher_class
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TABLE.fetch(scope_symbol)
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end
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end
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end
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end
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end
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