private Type DoCoalesceAssignment(NyaParser.AssignmentContext context)
{
string sLocal = context.identifier().GetText();
Variable local = _scopeManager.FindVariable(sLocal);
Label nullOp = _ilg.DefineLabel();
local.Load(_ilg);
_stackDepth++;
_ilg.Emit(OpCodes.Dup);
_ilg.Emit(OpCodes.Brtrue_S, nullOp);
_ilg.Emit(OpCodes.Pop);
Type src = (Type)Visit(context.expression());
Type dst = local.Type;
if (!TypeHelper.TryConvert(_ilg, src, local.Type))
{
throw new Exception("Shit's whacked, yo");
}
_ilg.MarkLabel(nullOp);
local.Store(_ilg);
_stackDepth -= 2;
return(local.Type);
}
public override object VisitAssignment([NotNull] NyaParser.AssignmentContext context)
{
switch (context.assignment_operator().GetText())
{
case "=":
return(DoBasicAssignment(context));
case "?=":
return(DoCoalesceAssignment(context));
default:
return(DoArithmenticAssignment(context));
}
}
private Type DoArithmenticAssignment(NyaParser.AssignmentContext context)
{
string sOperator = context.assignment_operator().GetText();
string sLocal = context.identifier().GetText();
Variable local = _scopeManager.FindVariable(sLocal);
local.Load(_ilg);
_stackDepth++;
Type src = (Type)Visit(context.expression());
Type dst = local.Type;
switch (sOperator)
{
case "+=": TypeHelper.DoMath(_ilg, dst, src, OpCodes.Add, "op_Addition"); break;
case "-=": TypeHelper.DoMath(_ilg, dst, src, OpCodes.Sub, "op_Subtraction"); break;
case "*=": TypeHelper.DoMath(_ilg, dst, src, OpCodes.Mul, "op_Multiply"); break;
case "/=": TypeHelper.DoMath(_ilg, dst, src, OpCodes.Div, "op_Division"); break;
case "%=": TypeHelper.DoMath(_ilg, dst, src, OpCodes.Rem, "op_Modulus"); break;
case "&=": TypeHelper.DoMath(_ilg, dst, src, OpCodes.And, "op_BitwiseAnd"); break;
case "|=": TypeHelper.DoMath(_ilg, dst, src, OpCodes.Or, "op_BitwiseOr"); break;
case "^=": TypeHelper.DoMath(_ilg, dst, src, OpCodes.Xor, "op_ExclusiveOr"); break;
case "<<=": TypeHelper.DoMath(_ilg, dst, src, OpCodes.Shl, "op_LeftShift"); break;
case ">>=": TypeHelper.DoMath(_ilg, dst, src, OpCodes.Shr, "op_RightShift"); break;
}
local.Store(_ilg);
_stackDepth -= 2;
return(local.Type);
}
private Type DoBasicAssignment(NyaParser.AssignmentContext context)
{
string sLocal = context.identifier().GetText();
Variable local = _scopeManager.FindVariable(sLocal);
Type src = (Type)Visit(context.expression());
Type dst = null;
if (local != null)
{
dst = local.Type;
}
else
{
if (context.type_descriptor() != null)
{
dst = ParseTypeDescriptor(context.type_descriptor());
}
else
{
dst = src;
}
// Someone did an untyped null assignment...
if (dst == null)
{
dst = typeof(object);
}
local = _ilg.DeclareLocal(dst);
_scopeManager.AddVariable(sLocal, local);
}
local.Store(_ilg);
_stackDepth--;
return(local.Type);
}
