Module: DR::Bool

Extended by:
Bool
Included in:
Bool
Defined in:
lib/dr/base/bool.rb

Instance Method Summary collapse

Instance Method Details

#to_bool(el, default = nil, allow_nil: true, string_fallback: true) ⇒ Object

Raises:

  • (ArgumentError) 


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# File 'lib/dr/base/bool.rb', line 4

def to_bool(el, default=nil, allow_nil: true, string_fallback: true)
  case el
  when String
    string=el.chomp
    return true if string =~ (/(true|t|yes|y|1)$/i)
    return false if string.empty? || string =~ (/(false|f|no|n|0)$/i)
    return el if string_fallback
  when Integer
    return ! (el == 0)
  when ::Process::Status
    exitstatus=el.exitstatus
    return exitstatus == 0
  else
    return true if el == true
    return false if el == false
    #we don't return !!el because we don't want nil to be false but to
    #give an error
  end
  return el if string_fallback and el.is_a?(Symbol)
  return default unless default.nil?
  return nil if el.nil? and allow_nil
  raise ArgumentError.new("Invalid value for Boolean: \"#{el}\"")
end