Compiler Project Language Features

def parse(self):
    self.stack.append(0)  # 初始状态
    current_token = self.tokens[self.index] if self.index < len(self.tokens) else None

    while True:
        state = self.stack[-1]  # 获取当前状态
        action, value = self.actions.get((state, current_token.token_type if current_token else "$"), (None, None))
            
        if action is None:
            print(f"Syntax Error: Unexpected token '{current_token.lexeme if current_token else 'EOF'}'")
            return
        if action == "s":  # 移入操作
            self.stack.append(value)  # 将目标状态压入栈
            self.index += 1  # 移动到下一个 token
            current_token = self.tokens[self.index] if self.index < len(self.tokens) else None
        elif action == "r":  # 规约操作
            lhs, rhs_length = self.rules[value]  # 获取产生式左部和右部长度
            print("lhs,rhs_length",lhs,rhs_length)
            for _ in range(rhs_length):  # 弹出 RHS 长度的符号
                self.stack.pop()
            state = self.stack[-1]  # 获取规约后的栈顶状态
            print(state,lhs)
            self.stack.append(self.goto[(state, lhs)])  # 根据 GOTO 表转移 
        elif action == "acc":  # 接受状态
            print("Syntactic Analysis Complete!")
            return