public override SValue Evaluate(ExecEnvironment env)
{
var dict = this.dict.Evaluate(env);
for (var i = 0; i < keys.Count; i++)
{
if (dict is SDict)
{
var key = this.keys[i].Evaluate(env) as SString;
if (key == null)
{
throw new VMException("it only take a string as the key", headAtom);
}
var d = dict.Get <Dictionary <String, SValue> >();
var k = key.Get <String>();
if (!d.ContainsKey(k))
{
d[k] = new SNull();
}
d[k].RefDict = dict as SDict;
d[k].RefDictKey = k;
d[k].RefList = null;
dict = d[k];
}
else if (dict is SList)
{
var index = this.keys[i].Evaluate(env) as SNumber;
if (index == null)
{
throw new VMException("it only take a number as the index", headAtom);
}
var l = dict.Get <List <SValue> >();
var idx = (int)index.Get <Decimal>();
if (idx >= l.Count)
{
throw new VMException("index out of range", headAtom);
}
l[idx].RefList = dict as SList;
l[idx].RefListIndex = idx;
l[idx].RefDict = null;
dict = l[idx];
}
else
{
throw new VMException("it only take a list or a dict as the first argument", headAtom);
}
}
return(dict);
}
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));
}