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# ------------------------------------------------------------------------------
# This datastructure represents a simple one-to-many relationship. It manages
# a dictionary of value/array pairs. It ignores duplicates of both the "one"
# and the "many".
# ------------------------------------------------------------------------------
var _items = {}
# return the size of _items or the size of an element in _items if "one" was
# specified.
func size(one=null):
var to_return = 0
if(one == null):
to_return = _items.size()
elif(_items.has(one)):
to_return = _items[one].size()
return to_return
# Add an element to "one" if it does not already exist
func add(one, many_item):
if(_items.has(one) and !_items[one].has(many_item)):
_items[one].append(many_item)
else:
_items[one] = [many_item]
func clear():
_items.clear()
func has(one, many_item):
var to_return = false
if(_items.has(one)):
to_return = _items[one].has(many_item)
return to_return
func to_s():
var to_return = ''
for key in _items:
to_return += str(key, ": ", _items[key], "\n")
return to_return
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