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require "active_support/core_ext/object/blank"
module ActiveSupport
# Usually key value pairs are handled something like this:
#
# h = {}
# h[:boy] = 'John'
# h[:girl] = 'Mary'
# h[:boy] # => 'John'
# h[:girl] # => 'Mary'
# h[:dog] # => nil
#
# Using +OrderedOptions+, the above code could be reduced to:
#
# h = ActiveSupport::OrderedOptions.new
# h.boy = 'John'
# h.girl = 'Mary'
# h.boy # => 'John'
# h.girl # => 'Mary'
# h.dog # => nil
#
# To raise an exception when the value is blank, append a
# bang to the key name, like:
#
# h.dog! # => raises KeyError: key not found: :dog
#
class OrderedOptions < Hash
alias_method :_get, :[] # preserve the original #[] method
protected :_get # make it protected
def []=(key, value)
super(key.to_sym, value)
end
def [](key)
super(key.to_sym)
end
def method_missing(name, *args)
name_string = name.to_s
if name_string.chomp!("=")
self[name_string] = args.first
else
bangs = name_string.chomp!("!")
if bangs
fetch(name_string.to_sym).presence || raise(KeyError.new("#{name_string} is blank."))
else
self[name_string]
end
end
end
def respond_to_missing?(name, include_private)
true
end
end
# +InheritableOptions+ provides a constructor to build an +OrderedOptions+
# hash inherited from another hash.
#
# Use this if you already have some hash and you want to create a new one based on it.
#
# h = ActiveSupport::InheritableOptions.new({ girl: 'Mary', boy: 'John' })
# h.girl # => 'Mary'
# h.boy # => 'John'
class InheritableOptions < OrderedOptions
def initialize(parent = nil)
if parent.kind_of?(OrderedOptions)
# use the faster _get when dealing with OrderedOptions
super() { |h, k| parent._get(k) }
elsif parent
super() { |h, k| parent[k] }
else
super()
end
end
def inheritable_copy
self.class.new(self)
end
end
end
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