#pragma once

#include <iostream>
#include <string>
#include <unordered_map>
#include <vector>
#include "ast.h"
#include "environment.h"

using namespace std;


using Hook2 = function<AST(Environment&,const AST&,const AST&)>;
using Hook3 = function<AST(Environment&,const AST&,const AST&,const AST&)>;


extern const unordered_map<AST::Type,string> typeName;

ostream& operator<<(ostream &os,AST::Type t);

template <typename T>
string stringify(const vector<T> &v,const string &join=", ");


Hook checkedHook(const Name &name,
                 const vector<AST::Type> &types,
                 const Hook &func);

Hook checkedHook(const Name &name,
                 const vector<AST::Type> &types1,const vector<AST::Type> &types2,
                 const Hook2 &func);

Hook checkedHook(const Name &name,
                 const vector<AST::Type> &types1,const vector<AST::Type> &types2,const vector<AST::Type> &types3,
                 const Hook3 &func);