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#pragma once
#include <functional>
#include <iostream>
#include <string>
#include <vector>
#include <cstdlib>
#include "global.h"
#include "indirect.h"
using namespace std;
class AST;
using Number = i64;
using String = string;
using Name = string;
using Index = i64;
class Terms : public vector<AST>{
public:
using vector<AST>::vector;
using vector<AST>::operator=;
};
class Lambda{
public:
Name arg; // if empty, then can only be referred to with indices
Indirect<AST> body=Indirect<AST>::makeEmpty();
Lambda();
Lambda(const Name &arg,const AST &ast);
};
using Native = function<AST(const AST&)>;
class ParseError : public runtime_error{
public:
explicit ParseError(const string &what_arg);
explicit ParseError(const char *what_arg);
};
class AST{
public:
enum class Type{
number,
string,
name,
index,
tuple,
lambda,
native,
};
Type type;
Number numval;
String strval;
Name nameval;
Index indexval;
Terms terms;
Lambda lambdaval;
Native nativeval;
bool quoted=false;
private:
class Tokeniser;
AST& parse(Tokeniser &tokeniser);
public:
AST(); // initialises to nil value ()
explicit AST(const string &source); // parses source
explicit AST(const char *source); // parses source
static AST makeNumber(Number numval);
static AST makeString(String strval);
static AST makeName(Name nameval);
static AST makeIndex(Index indexval);
static AST makeTuple(Terms terms);
static AST makeLambda(Lambda lambdaval);
static AST makeLambda(const Name &arg,const AST &body);
static AST makeNative(const Native &native);
};
namespace std {
template <>
struct hash<AST::Type>{
size_t operator()(const AST::Type &type) const {
return (size_t)type;
}
};
}
ostream& operator<<(ostream &os,const AST &ast);
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