Class: Quacky::DuckTypeVerifier

Inherits:
Object
  • Object
show all
Defined in:
lib/quacky/duck_type_verifier.rb

Instance Method Summary collapse

Constructor Details

#initialize(duck_type) ⇒ DuckTypeVerifier

Returns a new instance of DuckTypeVerifier.



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# File 'lib/quacky/duck_type_verifier.rb', line 5

def initialize duck_type
  @duck_type = duck_type
end

Instance Method Details

#verify!(object) ⇒ Object 



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# File 'lib/quacky/duck_type_verifier.rb', line 9

def verify! object
  duck_type_methods.each do |method|
    raise Quacky::DuckTypeVerificationFailure, "object does not respond to `#{method.name}'" unless object.respond_to?(method.name)

    target_method = object.public_method(method.name)
    return true if target_method.parameters.any? { |p| p.first == :rest }

    method_parameters = method.parameters.reject { |p| p.first == :block }
    target_method_parameters = target_method.parameters.reject { |p| p.first == :block }

    if target_method_parameters.count != method_parameters.count ||
       target_method_parameters.map {|p| p.first } != method_parameters.map {|p| p.first}
      raise Quacky::DuckTypeVerificationFailure, "definitions of method `#{method.name}` differ in parameters accepted."
    end

    true
  end
end