def init_grammar(self, filepath):
flag = 0
with open(filepath, 'r') as grammar_input:
for line in grammar_input:
print line
tmp_split = line.rsplit("->", 1)
left_part = tmp_split[0].replace("\n", "").strip()
if flag == 0:
self.initial = left_part.replace("\n", "").strip()
flag = 1
right_part = tmp_split[1].rsplit("|")
self.non_terminals.append(left_part.strip())
for item in right_part:
production = Production()
each_right_part = item.split(",")
for subitem in each_right_part:
production.body.append(subitem.replace("\n", "").strip())
production.name = left_part.strip()
self.productions.append(production)
for p in self.productions:
for item in p.body:
if(item not in self.non_terminals) and (item not in self.terminals) and (item != '@'):
self.terminals.append(item)
def get_join_production(self, prod_name):
new_production = Production()
productions = self.get_production(prod_name)
new_production.name = prod_name
for p in productions:
p.define_first_set(self)
new_production.first_union(p.first_set)
new_production.follow_union(p.follow_set)
return new_production
