internal EffectInstruction(IList <EffectToken> tokens, ref int index)
{
Opcode = tokens[index++];
string format;
if (Opcode.MaybeInt32 && InstructionFormats.TryGetValue(Opcode.AsInt32, out format))
{
if (Opcode.AsInt32 == 0x85)
{
while (index < tokens.Count && !tokens[index].IsFunction)
{
OperandsMutable.Add(tokens[index++]);
}
}
else if (Opcode.AsInt32 == 0x88)
{
while (index < tokens.Count)
{
OperandsMutable.Add(tokens[index++]);
}
}
else
{
foreach (char operandType in format)
{
if (index >= tokens.Count)
{
Opcode.AddError("Expected '{0}'; end of tokens.", operandType);
break;
}
if (tokens[index].IsFunction)
{
tokens[index].AddError("Last instruction expected '{0}', not a function.", operandType);
break;
}
var operand = tokens[index++];
OperandsMutable.Add(operand);
switch (operandType)
{
case 'i':
if (!operand.MaybeInt32)
{
operand.AddError("Expected an integer.");
}
break;
case 'p':
if (!operand.MaybePointer)
{
operand.AddError("Expected a pointer.");
}
break;
case 'z':
if (!operand.IsZero)
{
operand.AddError("Expected zero.");
}
break;
case 's':
if (!operand.MaybeSingle)
{
operand.AddError("Expected a Single.");
}
break;
}
}
}
}
else
{
Opcode.AddError("Opcode is unknown or invalid; operands are crap.");
while (index < tokens.Count && !(tokens[index].MaybeInt32 && InstructionFormats.ContainsKey(tokens[index].AsInt32)) && !tokens[index].IsFunction)
{
OperandsMutable.Add(tokens[index++]);
}
}
}
