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#pragma once
#include <functional>
#include <unordered_set>
#include <unordered_map>
#include "ast.h"
#include "global.h"
using namespace std;
class Environment{
public:
using Hook = function<AST(Environment&,const AST&)>;
using Hook2 = function<AST(Environment&,const AST&,const AST&)>;
private:
unordered_map<string,AST> defs;
unordered_map<string,Hook> hooks;
void reduce(AST &ast,i64 depth=0);
bool betareduce(AST &ast,i64 depth);
public:
void load(const Environment &other);
AST run(const AST &ast);
void define(const Name &name,const AST &ast);
void define(const Name &name,const Hook &hook);
void define2(const Name &name,const Hook2 &hook2);
AST get(const Name &name);
};
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