Method pop

src/blib2to3/pgen2/parse.py:382–395

Pop a nonterminal. (Internal)

(self)

            self.stack.append((newdfa, 0, newnode))

    def pop(self) -> None:
        """Pop a nonterminal.  (Internal)"""
        if self.is_backtracking:
            self.stack.pop()
        else:
            popdfa, popstate, popnode = self.stack.pop()
            newnode = convert(self.grammar, popnode)
            if self.stack:
                dfa, state, node = self.stack[-1]
                assert node[-1] is not None
                node[-1].append(newnode)
            else:
                self.rootnode = newnode
                self.rootnode.used_names = self.used_names