private int process_child(VTDNav vn)
{
int result;
bool b = false, b1 = false;
//int contextSize;
Predicate t = null;
switch (state)
{
case START:
if (currentStep.nt.testType != NodeTest.TEXT)
{
// first search for any predicate that
// requires contextSize
// if so, compute its context size
// if size > 0
// set context
// if size ==0
// immediately set the state to backward or end
t = currentStep.p;
while (t != null)
{
if (t.requireContextSize())
{
int i = computeContextSize(t, vn);
if (i == 0)
{
b1 = true;
break;
}
else
t.ContextSize = i;
}
t = t.nextP;
}
if (b1)
{
state = END;
break;
}
b = vn.toElement(VTDNav.FIRST_CHILD);
state = END;
if (b == true)
{
do
{
if (currentStep.eval(vn))
{
if (currentStep.NextStep != null)
{
//currentStep.position++;
state = FORWARD;
currentStep = currentStep.NextStep;
}
else
{
state = TERMINAL;
result = vn.getCurrentIndex();
if (isUnique(result))
{
return result;
}
}
break;
}
}
while (vn.toElement(VTDNav.NS));
if (state == END)
vn.toElement(VTDNav.PARENT);
}
}
else
{
if (vn.AtTerminal == true)
{
state = END;
}
else
{
// compute context size;
t = currentStep.p;
while (t != null)
{
if (t.requireContextSize())
{
int i = computeContextSize(t, vn);
if (i == 0)
{
b1 = true;
break;
}
else
t.ContextSize=i;
}
t = t.nextP;
}
// b1 false indicate context size is zero. no need to go any further...
if (b1)
{
state = END;
break;
}
// get textIter
TextIter ti = null;
if (currentStep.o != null)
{
ti = (TextIter)currentStep.o;
}
else
{
ti = new TextIter();
currentStep.o = ti;
}
ti.touch(vn);
state = END;
while ((result = ti.getNext()) != -1)
{
if (currentStep.evalPredicates(vn))
{
break;
}
}
// old code
//result = vn.getText();
if (result != -1)
{
vn.AtTerminal=true;
//currentStep.resetP(vn);
vn.LN = result;
if (currentStep.NextStep != null)
{
vn.LN = result;
state = FORWARD;
currentStep = currentStep.NextStep;
}
else
{
//vn.pop();
state = TERMINAL;
if (isUnique(result))
{
vn.LN = result;
return result;
}
}
}
else
{
//currentStep.set_ft(true);
currentStep.resetP(vn);
vn.AtTerminal=false;
}
}
}
break;
case END:
currentStep = null;
// reset();
return - 1;
case FORWARD:
if (currentStep.nt.testType != NodeTest.TEXT)
{
t = currentStep.p;
while (t != null)
{
if (t.requireContextSize())
{
int i = computeContextSize(t, vn);
if (i == 0)
{
b1 = true;
break;
}
else
t.ContextSize = i;
}
t = t.nextP;
}
if (b1)
{
currentStep = currentStep.PrevStep;
state = BACKWARD;
break;
}
state = BACKWARD;
if (vn.toElement(VTDNav.FC))
{
do
{
if (currentStep.eval(vn))
{
if (currentStep.NextStep != null)
{
state = FORWARD;
currentStep = currentStep.NextStep;
}
else
{
state = TERMINAL;
result = vn.getCurrentIndex();
if (isUnique(result))
return result;
}
//UPGRADE_NOTE: Labeled break statement was changed to a goto statement. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1012'"
goto forward_brk;
}
}
while (vn.toElement(VTDNav.NS));
vn.toElement(VTDNav.P);
currentStep.resetP(vn);
currentStep = currentStep.PrevStep;
}
else
{
//vn.toElement(VTDNav.P);
currentStep = currentStep.PrevStep;
}
//UPGRADE_NOTE: Label 'forward_brk' was added. "ms-help://MS.VSCC.v80/dv_commoner/local/redirect.htm?index='!DefaultContextWindowIndex'&keyword='jlca1011'"
forward_brk: ;
}
else
{
// predicate at an attribute is not evaled
if (vn.AtTerminal == true)
{
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
else
{
// compute context size;
t = currentStep.p;
while (t != null)
{
if (t.requireContextSize())
{
int i = computeContextSize(t, vn);
if (i == 0)
{
b1 = true;
break;
}
else
t.ContextSize=i;
}
t = t.nextP;
}
// b1 false indicate context size is zero. no need to go any further...
if (b1)
{
state = BACKWARD;
break;
}
// get textIter
TextIter ti = null;
if (currentStep.o != null)
{
ti = (TextIter)currentStep.o;
}
else
{
ti = new TextIter();
currentStep.o = ti;
}
ti.touch(vn);
//result = ti.getNext();
while ((result = ti.getNext()) != -1)
{
if (currentStep.evalPredicates(vn))
{
break;
}
}
if (result == -1)
{
//currentStep.set_ft(true);
//currentStep.resetP(vn);
vn.AtTerminal=false;
if (state == FORWARD)
{
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
}
else
{
vn.AtTerminal=true;
if (currentStep.NextStep != null)
{
vn.LN = result;
state = FORWARD;
currentStep = currentStep.NextStep;
}
else
{
//vn.pop();
state = TERMINAL;
if (isUnique(result))
{
vn.LN = result;
return result;
}
}
}
}
}
break;
case BACKWARD:
if (currentStep.nt.testType != NodeTest.TEXT)
{
//currentStep = currentStep.getPrevStep();
b = false;
while (vn.toElement(VTDNav.NS))
{
if (currentStep.eval(vn))
{
b = true;
break;
}
}
if (b == true)
{
state = FORWARD;
currentStep = currentStep.NextStep;
}
else if (currentStep.PrevStep == null)
{
currentStep.resetP(vn);
vn.toElement(VTDNav.P);
state = END;
}
else
{
currentStep.resetP(vn);
state = BACKWARD;
vn.toElement(VTDNav.P);
currentStep = currentStep.PrevStep;
}
}
else
{
vn.AtTerminal = false;
if (currentStep.PrevStep == null)
state = END;
else
{
state = BACKWARD;
//vn.setAtTerminal(false);
currentStep = currentStep.PrevStep;
}
}
break;
case TERMINAL:
if (currentStep.nt.testType != NodeTest.TEXT)
{
while (vn.toElement(VTDNav.NS))
{
if (currentStep.eval(vn))
{
// state = TERMINAL;
result = vn.getCurrentIndex();
if (isUnique(result))
return result;
}
}
currentStep.resetP(vn);
if (currentStep.PrevStep == null)
{
state = END;
vn.toElement(VTDNav.P);
}
else
{
vn.toElement(VTDNav.P);
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
}
else
{
TextIter ti = (TextIter)currentStep.o;
while ((result = ti.getNext()) != -1)
{
if (currentStep.evalPredicates(vn))
{
if (isUnique(result))
return result;
}
}
currentStep.resetP(vn);
vn.AtTerminal=false;
if (currentStep.PrevStep == null)
state = END;
else
{
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
}
break;
default:
throw new XPathEvalException("unknown state");
}
return - 2;
}
private void selectNodeType(TextIter ti)
{
if (currentStep.nt.testType == NodeTest.TEXT)
ti.selectText();
else if (currentStep.nt.testType == NodeTest.COMMENT)
ti.selectComment();
else if (currentStep.nt.testType == NodeTest.PI0)
ti.selectPI0();
else
{
ti.selectPI1(currentStep.nt.nodeName);
}
}
public int computeContextSize(Predicate p, VTDNav vn){
bool b = false;
Predicate tp = null;
int i = 0;
AutoPilot ap;
switch(currentStep.axis_type){
case AxisType.CHILD:
if (currentStep.nt.testType != NodeTest.TEXT){
b = vn.toElement(VTDNav.FIRST_CHILD);
if (b) {
do {
if (currentStep.eval(vn, p)) {
i++;
}
} while (vn.toElement(VTDNav.NS));
vn.toElement(VTDNav.PARENT);
currentStep.resetP(vn,p);
return i;
} else
return 0;
}else {
TextIter ti = new TextIter();
ti.touch(vn);
while((ti.getNext())!=-1){
if (currentStep.evalPredicates(vn,p)){
i++;
}
}
currentStep.resetP(vn,p);
return i;
}
case AxisType.DESCENDANT_OR_SELF:
case AxisType.DESCENDANT:
case AxisType.PRECEDING:
case AxisType.FOLLOWING:
String helper = null;
if (currentStep.nt.testType == NodeTest.NODE){
helper = "*";
}else {
helper = currentStep.nt.nodeName;
}
ap = new AutoPilot(vn);
if (currentStep.axis_type == AxisType.DESCENDANT_OR_SELF )
if (currentStep.nt.testType == NodeTest.NODE)
ap.Special = true;
else
ap.Special = false;
//currentStep.o = ap = new AutoPilot(vn);
if (currentStep.axis_type == AxisType.DESCENDANT_OR_SELF)
if (currentStep.nt.localName!=null)
ap.selectElementNS(currentStep.nt.URL,currentStep.nt.localName);
else
ap.selectElement(helper);
else if (currentStep.axis_type == AxisType.DESCENDANT)
if (currentStep.nt.localName!=null)
ap.selectElementNS_D(currentStep.nt.URL,currentStep.nt.localName);
else
ap.selectElement_D(helper);
else if (currentStep.axis_type == AxisType.PRECEDING)
if (currentStep.nt.localName!=null)
ap.selectElementNS_P(currentStep.nt.URL,currentStep.nt.localName);
else
ap.selectElement_P(helper);
else
if (currentStep.nt.localName!=null)
ap.selectElementNS_F(currentStep.nt.URL,currentStep.nt.localName);
else
ap.selectElement_F(helper);
vn.push2();
while(ap.iterate()){
if (currentStep.evalPredicates(vn,p)){
i++;
}
}
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.PARENT:
vn.push2();
i = 0;
if (vn.toElement(VTDNav.PARENT)){
if (currentStep.eval(vn,p)){
i++;
}
}
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.ANCESTOR:
vn.push2();
i = 0;
while (vn.toElement(VTDNav.PARENT)) {
if (currentStep.eval(vn, p)) {
i++;
}
}
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.ANCESTOR_OR_SELF:
vn.push2();
i = 0;
do {
if (currentStep.eval(vn, p)) {
i++;
}
}while(vn.toElement(VTDNav.PARENT));
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.SELF:
i = 0;
if (vn.toElement(VTDNav.PARENT)){
if (currentStep.eval(vn,p)){
i++;
}
}
currentStep.resetP(vn,p);
return i;
case AxisType.FOLLOWING_SIBLING:
vn.push2();
while(vn.toElement(VTDNav.NEXT_SIBLING)){
if (currentStep.eval(vn,p)){
i++;
}
}
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.PRECEDING_SIBLING:
vn.push2();
while(vn.toElement(VTDNav.PREV_SIBLING)){
if (currentStep.eval(vn,p)){
i++;
}
}
vn.pop2();
currentStep.resetP(vn,p);
return i;
case AxisType.ATTRIBUTE:
ap = new AutoPilot(vn);
if (currentStep.nt.localName!=null)
ap.selectAttrNS(currentStep.nt.URL,
currentStep.nt.localName);
else
ap.selectAttr(currentStep.nt.nodeName);
i = 0;
while(ap.iterateAttr()!=-1){
if (currentStep.evalPredicates(vn,p)){
i++;
}
}
currentStep.resetP(vn,p);
return i;
default:
throw new XPathEvalException("axis not supported");
}
//return 8;
}
