Class: NxtInit::Option

Inherits:
Object
  • Object
show all
Defined in:
lib/nxt_init/option.rb

Constant Summary collapse

InvalidOptionError = 
Class.new(ArgumentError)

Instance Attribute Summary collapse

Instance Method Summary collapse

Constructor Details

#initialize(key, default_value: NotProvidedOption.new) ⇒ Option

Returns a new instance of Option.



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# File 'lib/nxt_init/option.rb', line 5

def initialize(key, default_value: NotProvidedOption.new)
  @key = key
  @default_value = default_value
end

Instance Attribute Details

#default_value ⇒ Object (readonly)

Returns the value of attribute default_value.



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# File 'lib/nxt_init/option.rb', line 10

def default_value
  @default_value
end

#key ⇒ Object (readonly)

Returns the value of attribute key.



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# File 'lib/nxt_init/option.rb', line 10

def key
  @key
end

Instance Method Details

#default_value_is_block? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/nxt_init/option.rb', line 38

def default_value_is_block?
  default_value && default_value.respond_to?(:call)
end

#default_value_is_preprocessor? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/nxt_init/option.rb', line 42

def default_value_is_preprocessor?
  default_value_is_block? && default_value.arity == 1
end

#default_value_was_given? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/nxt_init/option.rb', line 46

def default_value_was_given?
  !default_value.is_a?(NotProvidedOption)
end

#requires_value? ⇒ Boolean

Returns:

  • (Boolean) 


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# File 'lib/nxt_init/option.rb', line 34

def requires_value?
  !default_value_was_given?
end

#resolve(attrs, target:) ⇒ Object 



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# File 'lib/nxt_init/option.rb', line 12

def resolve(attrs, target:)
  if default_value_was_given?
    key_missing = !attrs.key?(key)
    given_value = attrs[key]

    if default_value_is_preprocessor?
      key_missing ? raise_key_error : target.instance_exec(given_value, &default_value)
    else
      # only when the given value was nil we will evaluate the fallback --> false is a valid value
      if given_value.nil?
        default_value_is_block? ? target.instance_exec(&default_value) : default_value
      else
        given_value
      end
    end
  elsif requires_value?
    attrs.fetch(key) { |_| raise_key_error }
  else
    raise InvalidOptionError, "Don't know how to deal with #{self}"
  end
end