private static void Command(ListController <TokenModel> lc)
{
if (lc.TryGetNext(out var first))
{
if (Keywords.Types.Contains(first.Text))
{
var varType = first.Text;
string varName = Variable(lc);
VarTable.Add(varName, varType);
}
else if (VarTable.Contains(first.Text))
{
if (!lc.TryGetNext(out var eq))
{
throw new ParseException("= expected", lc.GetPrevious(), true);
}
if (eq.Text != "=")
{
throw new ParseException("= expected", lc.GetPrevious(), true);
}
AssingNode asNode = new AssingNode();
asNode.Left = new VarNode()
{
Variable = VarTable.Get(first.Text),
};
if (!lc.TryGetNext(out var next))
{
throw new ParseException("Function or expression expected", lc.GetPrevious(), true);
}
if (FuncTable.Contains(next.Text))
{
lc.SetBack();
asNode.Right = Func(lc);
}
else if (VarTable.Contains(next.Text) || next.Text.All(c => Constants.Numbers.Contains(c)))
{
lc.SetBack();
//todo arithmetic
throw new NotImplementedException("Arithmetic don't included, for now");
}
else
{
throw new ParseException("Function or expression expected", lc.GetPrevious(), true);
}
}
}
}
//TODO TESTS
private static AssingNode VariableAssign(ListController <TokenModel> lc)
{
var variableToken = lc.GetNext();
CheckEqual(TryGetNext(lc, "= expected"), "=", "= expected");
var func = TryGetNext(lc, "Expression expected");
var res = new AssingNode();
var variable = VarTable.Get(variableToken.Text);
res.Left = variable;
if (FuncTable.Contains(func.Text))
{
lc.SetBack();
var fn = FuncExecute(lc);
res.Right = fn;
}
else
{
throw new ParseException("Function expected", func);
}
return(res);
}
