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#include <iostream>
#include <sstream>
#include <string>
#include "error.h"
#include "prelude.h"
using namespace std;
Environment prelude;
const AST afterBootstrap=AST(R"RAW(
(do
(def '. \f \g \x (f (g x)))
(def 'flip \f \a \b (f b a))
(def 'id \x x)
(def 'const \x \y x)
(def 'print (. putstr repr)))
)RAW");
static AST dofunction(const AST&);
const AST doNative=AST::makeNative(dofunction);
static AST dofunction(const AST&){
return doNative;
}
class PreludeInit{
public:
PreludeInit(Environment &intoEnv){
intoEnv.define("repr",AST::makeNative([](const AST &ast) -> AST {
stringstream ss;
ss<<ast;
String res=ss.str();
return AST::makeString(res);
}));
intoEnv.define("putstr",AST::makeNative([](const AST &ast) -> AST {
if(ast.type!=AST::Type::string){
throw TypeError("Argument to 'putstr' is not a String");
}
cout<<ast.strval<<endl;
return AST();
}));
intoEnv.define("def",[](Environment &env,const AST &arg1) -> AST {
return AST::makeNative([&env,arg1](const AST &arg2) -> AST {
if(arg1.type!=AST::Type::name){
throw TypeError("First argument to 'def' is not a Name");
}
env.define(arg1.nameval,arg2);
return AST();
});
});
intoEnv.define("do",doNative);
intoEnv.define("unquote",AST::makeNative([](const AST &ast) -> AST {
AST res(ast);
res.quoted=false;
return res;
}));
intoEnv.define2("+",[](Environment&,const AST &arg1,const AST &arg2) -> AST {
if(arg1.type!=arg2.type){
throw TypeError("Unequal types in '+'");
}
if(arg1.type==AST::Type::number){
return AST::makeNumber(arg1.numval+arg2.numval);
} else if(arg1.type==AST::Type::string){
return AST::makeString(arg1.strval+arg2.strval);
} else {
throw TypeError("Arguments to '+' neither Number nor String");
}
});
intoEnv.run(afterBootstrap);
}
} preludeInit(prelude);
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