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name : key_stroke.rb
 class Reline::KeyStroke
  using Module.new {
    refine Array do
      def start_with?(other)
        other.size <= size && other == self.take(other.size)
      end

      def bytes
        self
      end
    end
  }

  def initialize(config)
    @config = config
  end

  def match_status(input)
    key_mapping.keys.select { |lhs|
      lhs.start_with? input
    }.tap { |it|
      return :matched  if it.size == 1 && (it.max_by(&:size)&.size&.== input.size)
      return :matching if it.size == 1 && (it.max_by(&:size)&.size&.!= input.size)
      return :matched  if it.max_by(&:size)&.size&.< input.size
      return :matching if it.size > 1
    }
    key_mapping.keys.select { |lhs|
      input.start_with? lhs
    }.tap { |it|
      return it.size > 0 ? :matched : :unmatched
    }
  end

  def expand(input)
    lhs = key_mapping.keys.select { |item| input.start_with? item }.sort_by(&:size).reverse.first
    return input unless lhs
    rhs = key_mapping[lhs]

    case rhs
    when String
      rhs_bytes = rhs.bytes
      expand(expand(rhs_bytes) + expand(input.drop(lhs.size)))
    when Symbol
      [rhs] + expand(input.drop(lhs.size))
    when Array
      rhs
    end
  end

  private

  def key_mapping
    @config.key_bindings
  end
end
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