Module: MethodChain

Included in:
Object
Defined in:
lib/methodchain/not-included.rb

Overview

:main: README

Instance Method Summary collapse

Instance Method Details

#and(*guards, &block) ⇒ Object

with no guards, is equivalent to self && yield_or_eval(&block) && self same as: self.then(*guards, &block) && self



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# File 'lib/methodchain/not-included.rb', line 81

def and *guards, &block
  if guards.empty? 
    return self if not self
  else
    guards.each do |cond|
      return self if not send_as_function(cond)
    end
  end

  block_given? ? (yield_or_eval(&block) && self) : self
end

#chain(*messages, &guard) ⇒ Object

method chaining with a guard. If no guard block is given then guard against nil and false



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# File 'lib/methodchain/not-included.rb', line 44

def chain *messages, &guard
  return self if messages.empty? or not(
    (block_given? ? (yield_or_eval(&guard)) : self))

  (send_as_function (messages.shift)).chain(*messages, &guard)
end

#else(*guards, &block) ⇒ Object

return self if self or a guard evaluates to true otherwise return the evaluation of the block



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# File 'lib/methodchain/not-included.rb', line 67

def else *guards, &block
  if guards.empty? 
    return self if self
  else
    guards.each do |cond|
      return self if send_as_function(cond)
    end
  end

  block_given? ? yield_or_eval(&block) : self
end

#or(*guards, &block) ⇒ Object

with no guards, is equivalent to self || (yield_or_eval(&block) && self) same as: self.else(*guards, &block) && self



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# File 'lib/methodchain/not-included.rb', line 95

def or *guards, &block
  if guards.empty? 
    return self if self
  else
    guards.each do |cond|
      return self if send_as_function(cond)
    end
  end

  block_given? ? yield_or_eval(&block) : self
end

#tap(*messages, &block) ⇒ Object

send messages, evaluate blocks, but always return self



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# File 'lib/methodchain/not-included.rb', line 36

def tap *messages, &block
  send_as_functions *messages unless messages.empty?
  yield_or_eval(&block) if block_given?
  self
end

#then(*guards, &block) ⇒ Object

return self if self or a guard evaluates to false, otherwise return the evaluation of the block



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# File 'lib/methodchain/not-included.rb', line 53

def then *guards, &block
  if guards.empty? 
    return self if not self
  else
    guards.each do |cond|
      return self if not send_as_function(cond)
    end
  end

  block_given? ? yield_or_eval(&block) : self
end