json_parser.rb revision f27108713d666e048ed262a6a2cfb5851dc01496
end
parser << input.read
input.close
end
protected
def initialize_parser_hooks
parser.start_document { document_start }
parser.end_document { document_end }
parser.start_object { object_start }
parser.end_object { object_end }
parser.start_array { array_start }
parser.end_array { array_end }
parser.key { |k| key(k) }
parser.value { |v| value(v) }
end
def call_back(key_name, order, *args)
callback.process(key_name.to_sym, order, *args) if callback
end
def select_callback(_order)
# This method is supposed to be overwritten by a subclass.
raise NotImplementedError
end
def process_key(_key)
# This method is supposed to be overwritten by a subclass.
raise NotImplementedError
end
def process_value(_value, _key = nil)
# This method is supposed to be overwritten by a subclass.
raise NotImplementedError
end
def document_start
self.hierarchy = []
self.keys_hierarchy = []
call_back(:document, :start)
end
def document_end
call_back(:document, :end)
end
def object_start
hierarchy << :object
select_callback(:start)
end
def object_end
select_callback(:end)
hierarchy.pop
hierarchy.pop if key?(hierarchy.last)
end
def array_start
hierarchy << :array
select_callback(:start)
end
def array_end
select_callback(:end)
hierarchy.pop
hierarchy.pop if key?(hierarchy.last)
end
def key(k)
hierarchy << k
keys_hierarchy << k
process_key(k)
end
def value(v)
if in_array?
process_value(v)
elsif key?(hierarchy.last)
process_value(v, current_key)
hierarchy.pop
keys_hierarchy.pop
else
end
end
# helpers
def current_key
keys_hierarchy.last
end
def key?(element)
element.is_a?(String)
end
def in_object?
hierarchy.last == :object
end
def in_array?
hierarchy.last == :array
end
end
end