module FirstOf
Constants
- VERSION
Public Instance Methods
first_of(*args)
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Should take arguments: first_of
(:symbol1, :symbol2) # will return first respond to and present first_of
([:symbol1, :symbol2]) # will return value if try_chain(:symbol1, :symbol2) present first_of
(1 => :symbol1, 2 => :symbol2) # will prioritize trying by key and return first present first_of
(1 => :symbol1, 2 => lambda { _call }) # will prioritize and only execute callable if first not present first_of
(1 => [:symbol1, :symbol2], 2 => -> { _call }) # will prioritize and execute try_chain on first and call 2nd if first not present first_of
(1 => :symbol1, 2 => 4) # will prioritize and return value (4) if first not present first_of
(lambda { _call }, 1 => :symbol1, 2 => :symbol2)
# File lib/first_of.rb, line 18 def first_of(*args) return _first_of(*args, :try_chain, :proxy_try_chain) end
first_of!(*args)
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# File lib/first_of.rb, line 22 def first_of!(*args) return _first_of(*args, :try_chain!, :proxy_try_chain!) end
Private Instance Methods
_extract_from_message_chain(methods_or_value, try_method = :try_chain, proxy_try_method = :proxy_try_chain)
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# File lib/first_of.rb, line 28 def _extract_from_message_chain(methods_or_value, try_method = :try_chain, proxy_try_method = :proxy_try_chain) case methods_or_value when Symbol, Array then if self.respond_to?(:try_chain) self.__send__(try_method, *methods_or_value) else ::TryChain.__send__(proxy_try_method, self, *methods_or_value) end else methods_or_value end end
_first_of(*args, try_method, proxy_try_method)
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# File lib/first_of.rb, line 41 def _first_of(*args, try_method, proxy_try_method) extract_hash = args.extract_options! # Don't care if the hash is empty or not because of #each call sorted_keys = extract_hash.keys.sort sorted_keys.each do |key| args << extract_hash[key] end args.each do |argument| if argument.respond_to?(:call) value = argument.call else value = _extract_from_message_chain(argument, try_method, proxy_try_method) end return value if _valid_value?(value) # return value if found end return nil end
_valid_value?(value)
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# File lib/first_of.rb, line 63 def _valid_value?(value) value.present? || [true, false].include?(value) end