internal override IList <Executable> Resolve(Parser parser)
{
this.Expression = this.Expression.Resolve(parser);
if (this.Expression == null)
{
return(new Executable[0]);
}
if (this.Expression is Increment)
{
Increment inc = (Increment)this.Expression;
Assignment output = new Assignment(
inc.Root,
inc.IncrementToken,
inc.IsIncrement ? "+=" : "-=",
new IntegerConstant(inc.IncrementToken, 1, this.FunctionOrClassOwner),
this.FunctionOrClassOwner);
return(output.Resolve(parser));
}
return(Listify(this));
}
private void CompileIncrement(Parser parser, ByteBuffer buffer, Increment increment, bool outputUsed)
{
if (!outputUsed)
{
throw new Exception("This should have been optimized into a += or -=");
}
if (increment.Root is Variable)
{
// OpCode re-use be damned. This should be not one, but two top-level op codes.
// INCREMENT_INLINE and INCREMENT_POP (depending on whether outputUsed is true)
// In fact, the code here in its current form is actually WRONG because someString++ will have
// a '1' appended to it when it really should be an error if the variable is not an integer.
// Same for the others below. Ideally the DUPLICATE_STACK_TOP op should be removed.
Variable variable = (Variable)increment.Root;
int scopeId = variable.LocalScopeId;
this.CompileExpression(parser, buffer, increment.Root, true);
if (increment.IsPrefix)
{
buffer.Add(increment.IncrementToken, OpCode.LITERAL, parser.GetIntConstant(1));
buffer.Add(increment.IncrementToken, OpCode.BINARY_OP, increment.IsIncrement ? (int)BinaryOps.ADDITION : (int)BinaryOps.SUBTRACTION);
buffer.Add(increment.IncrementToken, OpCode.DUPLICATE_STACK_TOP, 1);
buffer.Add(variable.FirstToken, OpCode.ASSIGN_LOCAL, scopeId);
}
else
{
buffer.Add(increment.IncrementToken, OpCode.DUPLICATE_STACK_TOP, 1);
buffer.Add(increment.IncrementToken, OpCode.LITERAL, parser.GetIntConstant(1));
buffer.Add(increment.IncrementToken, OpCode.BINARY_OP, increment.IsIncrement ? (int)BinaryOps.ADDITION : (int)BinaryOps.SUBTRACTION);
buffer.Add(variable.FirstToken, OpCode.ASSIGN_LOCAL, scopeId);
}
}
else if (increment.Root is BracketIndex)
{
BracketIndex bracketIndex = (BracketIndex)increment.Root;
this.CompileExpression(parser, buffer, bracketIndex.Root, true);
this.CompileExpression(parser, buffer, bracketIndex.Index, true);
buffer.Add(increment.IncrementToken, OpCode.DUPLICATE_STACK_TOP, 2);
buffer.Add(bracketIndex.BracketToken, OpCode.INDEX);
if (increment.IsPrefix)
{
buffer.Add(increment.IncrementToken, OpCode.LITERAL, parser.GetIntConstant(1));
buffer.Add(increment.IncrementToken, OpCode.BINARY_OP, increment.IsIncrement ? (int)BinaryOps.ADDITION : (int)BinaryOps.SUBTRACTION);
buffer.Add(increment.IncrementToken, OpCode.ASSIGN_INDEX, 1);
}
else
{
buffer.Add(increment.IncrementToken, OpCode.STACK_INSERTION_FOR_INCREMENT);
buffer.Add(increment.IncrementToken, OpCode.LITERAL, parser.GetIntConstant(1));
buffer.Add(increment.IncrementToken, OpCode.BINARY_OP, increment.IsIncrement ? (int)BinaryOps.ADDITION : (int)BinaryOps.SUBTRACTION);
buffer.Add(increment.IncrementToken, OpCode.ASSIGN_INDEX, 0);
}
}
else if (increment.Root is DotStep)
{
DotStep dotStep = (DotStep)increment.Root;
this.CompileExpression(parser, buffer, dotStep.Root, true);
buffer.Add(increment.IncrementToken, OpCode.DUPLICATE_STACK_TOP, 1);
buffer.Add(dotStep.DotToken, OpCode.DEREF_DOT, parser.GetId(dotStep.StepToken.Value));
if (increment.IsPrefix)
{
buffer.Add(increment.IncrementToken, OpCode.LITERAL, parser.GetIntConstant(1));
buffer.Add(increment.IncrementToken, OpCode.BINARY_OP, increment.IsIncrement ? (int)BinaryOps.ADDITION : (int)BinaryOps.SUBTRACTION);
buffer.Add(increment.IncrementToken, OpCode.ASSIGN_STEP, parser.GetId(dotStep.StepToken.Value), 1);
}
else
{
buffer.Add(increment.IncrementToken, OpCode.DUPLICATE_STACK_TOP, 2);
buffer.Add(increment.IncrementToken, OpCode.LITERAL, parser.GetIntConstant(1));
buffer.Add(increment.IncrementToken, OpCode.BINARY_OP, increment.IsIncrement ? (int)BinaryOps.ADDITION : (int)BinaryOps.SUBTRACTION);
buffer.Add(increment.IncrementToken, OpCode.ASSIGN_STEP, parser.GetId(dotStep.StepToken.Value), 0);
buffer.Add(increment.IncrementToken, OpCode.STACK_SWAP_POP);
}
}
else
{
throw new ParserException(increment.IncrementToken, "Cannot apply " + (increment.IsIncrement ? "++" : "--") + " to this sort of expression.");
}
}