# Copyright (c) 2008 Sam Smoot.
# 
# Permission is hereby granted, free of charge, to any person obtaining
# a copy of this software and associated documentation files (the
# "Software"), to deal in the Software without restriction, including
# without limitation the rights to use, copy, modify, merge, publish,
# distribute, sublicense, and/or sell copies of the Software, and to
# permit persons to whom the Software is furnished to do so, subject to
# the following conditions:
# 
# The above copyright notice and this permission notice shall be
# included in all copies or substantial portions of the Software.
# 
# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
# EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
# MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
# NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE
# LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
# OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
# WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 
class Object
  # @return <TrueClass, FalseClass>
  #
  # @example [].blank?         #=>  true
  # @example [1].blank?        #=>  false
  # @example [nil].blank?      #=>  false
  # 
  # Returns true if the object is nil or empty (if applicable)
  def blank?
    nil? || (respond_to?(:empty?) && empty?)
  end
end # class Object
 
class Numeric
  # @return <TrueClass, FalseClass>
  # 
  # Numerics can't be blank
  def blank?
    false
  end
end # class Numeric
 
class NilClass
  # @return <TrueClass, FalseClass>
  # 
  # Nils are always blank
  def blank?
    true
  end
end # class NilClass
 
class TrueClass
  # @return <TrueClass, FalseClass>
  # 
  # True is not blank.  
  def blank?
    false
  end
end # class TrueClass
 
class FalseClass
  # False is always blank.
  def blank?
    true
  end
end # class FalseClass
 
class String
  # @example "".blank?         #=>  true
  # @example "     ".blank?    #=>  true
  # @example " hey ho ".blank? #=>  false
  # 
  # @return <TrueClass, FalseClass>
  # 
  # Strips out whitespace then tests if the string is empty.
  def blank?
    strip.empty?
  end
end # class String