def __init__(self):
self.compiler = Compiler()
# parser state
self.agg_name = defaultdict(none)
self.bc = set()
self.other = []
self.ruleix = 0
# rules
self.rules = {}
self.updaters = defaultdict(list)
self._gbc = defaultdict(list)
# data structures
self.agenda = prioritydict()
self.chart = Charts(self.agg_name)
self.error = {}
self.changed = {}
# misc
self.time_step = 0
# coarsening of the program shows which rules might depend on each other
self.coarse_deps = defaultdict(set)
self.rule_by_head = defaultdict(set)
self.rule_dep = defaultdict(set) # rules which depend on a predicate
# rules which need to be recompiled against new program state.
self.recompile = set()
# forward chaining rules which failed to initialize
self.uninitialized_rules = []
