Class: Array

Inherits:
Object
  • Object
show all
Defined in:
lib/shikashi/pick_argument.rb

Instance Method Summary collapse

Instance Method Details

#pick(*args) ⇒ Object 



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# File 'lib/shikashi/pick_argument.rb', line 39

def pick(*args)

  klass = args.pick_by_class Class
  hash_key = args.pick_by_class Symbol

  ary = []

  if klass
    ary = self.select{|x| x.instance_of? klass}

    if ary.size > 1
      raise ArgumentError, "ambiguous parameters of class #{klass}"
    end
  else
    ary = []
  end

  if hash_key
    each do |x|
      if x.instance_of? Hash
        if x[hash_key]
          ary << x[hash_key]
        end
      end
    end

    if ary.size > 1
      raise ArgumentError, "ambiguous parameters of class #{klass} and key '#{hash_key}'"
    end

  end

  if ary.size == 1
    return ary.first
  end

  unless block_given?
    raise ArgumentError, "missing mandatory argument '#{hash_key}' or of class #{klass}"
  end

  yield
end

#pick_by_class(klass) ⇒ Object 



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# File 'lib/shikashi/pick_argument.rb', line 27

def pick_by_class(klass)
  klassary = self.select{|x| x.instance_of? klass}
  if klassary.size > 1
    raise ArgumentError, "ambiguous parameters of class #{klass}"
  elsif klassary.size == 1
    klassary.first
  else
    nil
  end

end