// 极简符号表：记录局部变量定义点。
#pragma once

#include <string>
#include <unordered_map>
#include <vector>

#include "SysYParser.h"

class SymbolTable {
 public:
  void EnterScope();
  void ExitScope();
  void Add(const std::string& name, SysYParser::VarDefContext* decl);
  bool ContainsInCurrent(const std::string& name) const;
  bool Contains(const std::string& name) const;
  SysYParser::VarDefContext* Lookup(const std::string& name) const;

 private:
  std::vector<std::unordered_map<std::string, SysYParser::VarDefContext*>>
      scopes_;
};