123 lines
2.5 KiB
Ruby
123 lines
2.5 KiB
Ruby
module Mutant
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class CLI
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# A classifier for input strings
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class Classifier < Matcher
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include AbstractType, Adamantium::Flat, Concord.new(:cache, :match)
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include Equalizer.new(:identifier)
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SCOPE_NAME_PATTERN = /[A-Za-z][A-Za-z_0-9]*/.freeze
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METHOD_NAME_PATTERN = /[_A-Za-z][A-Za-z0-9_]*[!?=]?/.freeze
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SCOPE_PATTERN = /(?:::)?#{SCOPE_NAME_PATTERN}(?:::#{SCOPE_NAME_PATTERN})*/.freeze
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SINGLETON_PATTERN = %r(\A(#{SCOPE_PATTERN})\z).freeze
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REGISTRY = []
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# Register classifier
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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 self.register
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REGISTRY << self
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end
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private_class_method :register
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# Return constant
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#
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# @param [String] location
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#
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# @return [Class|Module]
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#
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# @api private
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#
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def self.constant_lookup(location)
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location.gsub(%r(\A::), '').split('::').inject(::Object) do |parent, name|
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parent.const_get(name)
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end
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end
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# Return matchers for input
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#
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# @return [Classifier]
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# if a classifier handles the input
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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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def self.build(*arguments)
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classifiers = REGISTRY.map do |descendant|
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descendant.run(*arguments)
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end.compact
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raise if classifiers.length > 1
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classifiers.first
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end
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# Run classifier
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#
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# @param [Cache] cache
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#
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# @param [String] input
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#
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# @return [Classifier]
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# if input is handled by classifier
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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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def self.run(cache, input)
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match = self::REGEXP.match(input)
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return unless match
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new(cache, match)
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end
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# No protected_class_method in ruby :(
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class << self; protected :run; end
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# Enumerate subjects
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#
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# @return [self]
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# if block given
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#
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# @return [Enumerator<Subject>]
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# otherwise
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#
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# @api private
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#
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def each(&block)
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return to_enum unless block_given?
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matcher.each(&block)
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self
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end
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# Return identifier
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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 identifier
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match.to_s
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end
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memoize :identifier
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# Return matcher
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#
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# @return [Matcher]
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#
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# @api private
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#
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abstract_method :matcher
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end # Classifier
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end # CLI
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end # Mutant
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