Class: Validate::Arguments::ArgumentsGuard

Inherits:
Object
  • Object
show all
Defined in:
lib/validate/arguments.rb

Constant Summary collapse

DEFAULT_VALUE = 
BasicObject.new

Instance Method Summary collapse

Constructor Details

#initialize(method, rules) ⇒ ArgumentsGuard

Returns a new instance of ArgumentsGuard.



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# File 'lib/validate/arguments.rb', line 54

def initialize(method, rules)
  signature = []
  assertions = []

  method.parameters.each do |(kind, name)|
    case kind
    when :req
      signature << name.to_s
    when :opt
      signature << "#{name} = DEFAULT_VALUE"
    when :rest
      signature << "*#{name}"
    when :keyreq
      signature << "#{name}:"
    when :key
      signature << "#{name}: DEFAULT_VALUE"
    when :keyrest
      signature << "**#{name}"
    when :block
      signature << "&#{name}"
    else
      raise Error::ArgumentError,
            "unsupported parameter type #{kind}"
    end
    next unless rules.include?(name)

    assertions <<
      "@rules[:#{name}].assert(#{name}, message: '#{name}') unless #{name}.eql?(DEFAULT_VALUE)"
  end

  singleton_class.class_eval(<<~RUBY, __FILE__, __LINE__)
    def enforce!(#{signature.join(', ')})
      #{assertions.join("\n  ")}
    end
  RUBY

  @rules = rules
end