internal override Opcode Eval(ProcessingContext context)
{
StackFrame sequences = context.TopSequenceArg;
Value[] values = context.Values;
StackFrame resultMask = context.TopArg;
Value[] sequenceBuffer = context.Sequences;
context.PushSequenceFrame();
for (int seqIndex = sequences.basePtr; seqIndex <= sequences.endPtr; ++seqIndex)
{
NodeSequence sourceSeq = sequenceBuffer[seqIndex].Sequence;
if (sourceSeq.Count > 0)
{
NodeSequenceItem[] items = sourceSeq.Items;
NodeSequence newSeq = null;
// Loop over the sequence, selecting those items for which the previous expression returned a result that
// matches the test value. Only those items will be processed further
// Note that the original position and size information is retained.
for (int i = resultMask.basePtr, n = 0; i <= resultMask.endPtr; ++i, ++n)
{
if (this.test == values[i].Boolean)
{
if (null == newSeq)
{
newSeq = context.CreateSequence();
}
newSeq.AddCopy(ref items[n], NodeSequence.GetContextSize(sourceSeq, n));
}
else
{
if (items[n].Last && null != newSeq)
{
newSeq.Items[newSeq.Count - 1].Last = true; // maintain nodeset boundaries...
}
}
}
context.PushSequence((null == newSeq) ? NodeSequence.Empty : newSeq);
newSeq = null;
}
}
return(this.next);
}
internal void TransferSequenceSizeTo(ref EvalStack stack)
{
StackFrame topArg = this.TopArg;
stack.PushFrame();
for (int i = topArg.basePtr; i <= topArg.endPtr; i++)
{
NodeSequence sequence = this.buffer.buffer[i].Sequence;
int count = sequence.Count;
if ((this.stack.stackPtr + count) > this.stack.bounds.end)
{
this.GrowStack(count);
}
for (int j = 0; j < count; j++)
{
stack.Push((double)NodeSequence.GetContextSize(sequence, j));
}
}
}
internal void TransferSequenceSizeTo(ref EvalStack stack)
{
StackFrame arg = this.TopArg;
stack.PushFrame();
for (int i = arg.basePtr; i <= arg.endPtr; ++i)
{
NodeSequence seq = this.buffer.buffer[i].Sequence;
int nodeCount = seq.Count;
if ((this.stack.stackPtr + nodeCount) > this.stack.bounds.end)
{
this.GrowStack(nodeCount);
}
for (int n = 0; n < nodeCount; ++n)
{
stack.Push((double)NodeSequence.GetContextSize(seq, n));
}
}
}
internal override Opcode Eval(ProcessingContext context)
{
StackFrame topSequenceArg = context.TopSequenceArg;
Value[] values = context.Values;
StackFrame topArg = context.TopArg;
Value[] sequences = context.Sequences;
context.PushSequenceFrame();
for (int i = topSequenceArg.basePtr; i <= topSequenceArg.endPtr; i++)
{
NodeSequence sequence = sequences[i].Sequence;
if (sequence.Count > 0)
{
NodeSequenceItem[] items = sequence.Items;
NodeSequence sequence2 = null;
int basePtr = topArg.basePtr;
for (int j = 0; basePtr <= topArg.endPtr; j++)
{
if (this.test == values[basePtr].Boolean)
{
if (sequence2 == null)
{
sequence2 = context.CreateSequence();
}
sequence2.AddCopy(ref items[j], NodeSequence.GetContextSize(sequence, j));
}
else if (items[j].Last && (sequence2 != null))
{
sequence2.Items[sequence2.Count - 1].Last = true;
}
basePtr++;
}
context.PushSequence((sequence2 == null) ? NodeSequence.Empty : sequence2);
sequence2 = null;
}
}
return(base.next);
}
