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require "forwardable"
module OpenGraphReader
# You get an instance of this class as result of your quest to obtain
# an OpenGraph object. It simply contains and returns the root objects,
# most commonly <tt>og</tt>.
class Base
extend Forwardable
# @!method [](name)
# Get a root object by name.
#
# @param [String] name The name of the root namespace.
# @return [Object, nil] The corresponding root object if available.
# @api private
# @!method []=(name, object)
# Make a new root object available on this base.
#
# @param [String] name The name of the root namespace.
# @param [Object] object The corresponding root object.
# @api private
# @!method each
# Traverse the available objects
#
# @yield [Object]
# @api private
def_delegators :@bases, :[], :[]=, :each_value
alias_method :each, :each_value
# If available, contains the source location of the document the
# available objects were parsed from.
#
# @return [String, nil]
attr_reader :origin
# Set origin.
#
# @api private
# @see #origin
attr_writer :origin
# Return the stored root objects as a hash.
#
# @api private
# @return [String => Object]
attr_reader :bases
alias_method :children, :bases
# @api private
def initialize
@bases = {}
end
# @private
def respond_to_missing?(method, _include_private=false)
@bases.has_key? method.to_s
end
# Makes the found root objects available.
# @return [Object]
def method_missing(method, *args, &block)
name = method.to_s
if respond_to_missing? name
@bases[name]
else
super(method, *args, &block)
end
end
end
end
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