Module: Factree::FactSource::ClassMethods

Defined in:
lib/factree/fact_source.rb

Instance Method Summary collapse

Instance Method Details

#def_fact(fact_name, &block) ⇒ Object

Defines a named fact along with a block used to compute the fact’s value.

Parameters:

  • fact_name (Symbol) —

    The new fact’s name

Raises:

  • (ArgumentError) 


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# File 'lib/factree/fact_source.rb', line 15

def def_fact(fact_name, &block)
  raise ArgumentError, "block required" unless block_given?

  all_fact_procs = fact_procs.merge(fact_name => block).freeze
  class_variable_set(:@@_fact_procs, all_fact_procs)
  fact_name
end

#defined?(fact_name) ⇒ Boolean

Returns True if the fact has been defined (using FactSource.def_fact).

Returns:

  • (Boolean) —

    True if the fact has been defined (using FactSource.def_fact)



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# File 'lib/factree/fact_source.rb', line 36

def defined?(fact_name)
  fact_procs.include? fact_name
end

#fact_names ⇒ Array<Symbol>

Returns Names for all of the defined facts, whether their values are known or not.

Returns:

  • (Array<Symbol>) —

    Names for all of the defined facts, whether their values are known or not.



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# File 'lib/factree/fact_source.rb', line 24

def fact_names
  fact_procs.keys.freeze
end

#fact_procs ⇒ Object

This method is part of a private API. You should avoid using this method if possible, as it may be removed or be changed in the future. 



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# File 'lib/factree/fact_source.rb', line 29

def fact_procs
  class_variable_defined?(:@@_fact_procs) ?
    class_variable_get(:@@_fact_procs) :
    {}.freeze
end