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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
/* $Rev$ $Date$ */
#ifndef tuscany_eval_primitive_hpp
#define tuscany_eval_primitive_hpp
/**
* Script evaluator primitive functions.
*/
#include <iostream>
#include "function.hpp"
#include "list.hpp"
#include "value.hpp"
namespace tuscany
{
const value primitiveSymbol("primitive");
const value quoteSymbol("'");
const value lambdaSymbol("lambda");
std::ostream* evalOut = &std::cout;
const bool setupEvalOut(std::ostream& out) {
evalOut = &out;
return true;
}
const value valueCar(list<value>& args) {
return car((list<value> )car(args));
}
const value valueCdr(list<value>& args) {
return cdr((list<value> )car(args));
}
const value valueCons(list<value>& args) {
return cons(car(args), (list<value> )cadr(args));
}
const value valueList(list<value>& args) {
return args;
}
const value valueNul(list<value>& args) {
return (bool)isNil(car(args));
}
const value valueEqual(list<value>& args) {
return (bool)(car(args) == cadr(args));
}
const value valueAdd(list<value>& args) {
if (isNil(cdr(args)))
return (double)car(args);
return (double)car(args) + (double)cadr(args);
}
const value valueSub(list<value>& args) {
if (isNil(cdr(args)))
return (double)0 - (double)car(args);
return (double)car(args) - (double)cadr(args);
}
const value valueMul(list<value>& args) {
return (double)car(args) * (double)cadr(args);
}
const value valueDiv(list<value>& args) {
return (double)car(args) / (double)cadr(args);
}
const value valueDisplay(list<value>& args) {
*evalOut << car(args);
return true;
}
const value valueComment(list<value>& args) {
*evalOut << "; " << car(args);
return true;
}
const value valueError(list<value>& args) {
std::cerr << (std::string)car(args);
return true;
}
const value applyPrimitiveProcedure(const value& proc, list<value>& args) {
const lambda<value(list<value>&)> func(cadr((list<value>)proc));
return func(args);
}
const bool isPrimitiveProcedure(const value& proc) {
return isTaggedList(proc, primitiveSymbol);
}
const bool isSelfEvaluating(const value& exp) {
if(isNil(exp))
return true;
if(isNumber(exp))
return true;
if(isString(exp))
return true;
if(isBoolean(exp))
return true;
if(isCharacter(exp))
return true;
return false;
}
const value primitiveImplementation(const list<value>& proc) {
return car(cdr(proc));
}
template<typename F> const value primitiveProcedure(const F& f) {
return mklist<value>(primitiveSymbol, (lambda<value(list<value>&)>)f);
}
const list<value> primitiveProcedureNames() {
list<value> l = mklist<value>("car");
l = cons<value>("cdr", l);
l = cons<value>("cons", l);
l = cons<value>("list", l);
l = cons<value>("nul", l);
l = cons<value>("=", l);
l = cons<value>("+", l);
l = cons<value>("-", l);
l = cons<value>("*", l);
l = cons<value>("/", l);
l = cons<value>("equal?", l);
l = cons<value>("display", l);
l = cons<value>(";", l);
return l;
}
const list<value> primitiveProcedureObjects() {
list<value> l = mklist(primitiveProcedure(valueCar));
l = cons(primitiveProcedure(valueCdr), l);
l = cons(primitiveProcedure(valueCons), l);
l = cons(primitiveProcedure(valueList), l);
l = cons(primitiveProcedure(valueNul), l);
l = cons(primitiveProcedure(valueEqual), l);
l = cons(primitiveProcedure(valueAdd), l);
l = cons(primitiveProcedure(valueSub), l);
l = cons(primitiveProcedure(valueMul), l);
l = cons(primitiveProcedure(valueDiv), l);
l = cons(primitiveProcedure(valueEqual), l);
l = cons(primitiveProcedure(valueDisplay), l);
l = cons(primitiveProcedure(valueComment), l);
return l;
}
const bool isFalse(const value& exp) {
return (bool)exp == false;
}
const bool isTrue(const value& exp) {
return (bool)exp == true;
}
const bool isQuoted(const value& exp) {
return isTaggedList(exp, quoteSymbol);
}
const value textOfQuotation(const value& exp) {
return car(cdr((list<value> )exp));
}
const value makeLambda(const list<value>& parameters, const list<value>& body) {
return cons(lambdaSymbol, cons<value>(parameters, body));
}
}
#endif /* tuscany_eval_primitive_hpp */
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