public override SValue Evaluate(ExecEnvironment env)
{
SValue lenValue = dict.Evaluate(env);
if (lenValue is SDict)
{
return(new SList((from k in lenValue.Get <Dictionary <string, SValue> >().Keys.ToList()
select(SValue) new SString(k)).ToList()));
}
else
{
throw new VMException("it only take a dict as the argument", headAtom);
}
}
public override SValue Evaluate(ExecEnvironment env)
{
SValue lenValue = argument.Evaluate(env);
if (lenValue is SString)
{
return(new SNumber(lenValue.Get <string>().Length));
}
else if (lenValue is SList)
{
return(new SNumber(lenValue.Get <List <SValue> >().Count));
}
else
{
return(new SNumber(0));
}
}
private SValue execLoop(SClosure body, SValue v, Decimal idx)
{
var newEnv = new ExecEnvironment();
if (body.Arguments.Count >= 1)
{
newEnv[body.Arguments[0]] = v;
}
if (body.Arguments.Count == 2)
{
newEnv[body.Arguments[1]] = new SNumber(idx);
}
newEnv.ParentEnv = body.InnerEnv;
return(body.Body.Evaluate(newEnv));
}
public override SValue Evaluate(ExecEnvironment env)
{
var body = this.body.Evaluate(env) as SClosure;
if (body == null)
{
throw new VMException("the second argument must be a lambda or a named function", headAtom);
}
SValue _list = this.list.Evaluate(env);
List <SValue> values = new List <SValue>();
SList list = new SList(values);
bool whileLoop = false;
bool condAlwaysTrue = false;
if (_list is SList)
{
list = _list as SList;
values = list.Get <List <SValue> >();
if (values.Count == 0)
{
whileLoop = true;
condAlwaysTrue = true;
}
}
else if (_list is SBool)
{
whileLoop = true;
condAlwaysTrue = false;
}
else
{
throw new VMException("the first argument must be a list or a bool", headAtom);
}
if (whileLoop)
{
while (condAlwaysTrue || this.list.Evaluate(env).Get <bool>())
{
var ret = execLoop(body, new SNull(), 0);
if (ret.Is <bool>() && !ret.Get <bool>())
{
break;
}
}
}
else
{
for (var i = 0; i < values.Count; i++)
{
var ret = execLoop(body, values[i], i);
if (ret.Is <bool>() && !ret.Get <bool>())
{
break;
}
}
}
return(new SBool(true));
}
public override SValue Evaluate(ExecEnvironment env)
{
SValue ret = (nameExpr == null) ? ret = env[vname].Evaluate(env) : nameExpr.Evaluate(env);
return(new SString(ret.GetType().Name.Substring(1).ToLower()));
}
