/// <summary>
///
/// </summary>
/// <param name="vn"></param>
/// <param name="s"></param>
/// <returns></returns>
private bool lang(VTDNav vn, String s)
{
// check the length of s
bool b = false;
vn.push2();
try
{
while (vn.getCurrentDepth() >= 0)
{
int i = vn.getAttrVal("xml:lang");
if (i != -1)
{
b = vn.matchTokenString(i, s);
break;
}
vn.toElement(VTDNav.P);
}
}
catch (NavException e)
{
}
vn.pop2();
return b;
}
private int process_parent(VTDNav vn)
{
bool b1 = false;
Predicate t = null;
int result;
switch (state)
{
case START:
case FORWARD:
t = currentStep.p;
while (t != null)
{
if (t.requireContext)
{
int i = computeContextSize(t, vn);
if (i == 0)
{
b1 = true;
break;
}
else
t.ContextSize=(i);
}
t = t.nextP;
}
if (b1)
{
if (state == FORWARD)
{
state = BACKWARD;
currentStep = currentStep.prevS;
}
else
state = END;
break;
}
if (vn.getCurrentDepth() == -1)
{
if (state == START)
state = END;
else
{
//vn.pop();
state = BACKWARD;
currentStep = currentStep.prevS;
}
}
else
{
vn.push2();
vn.toElement(VTDNav.P); // must return true
if ((currentStep.nt_eval || currentStep.nt.eval(vn))
&& ((!currentStep.hasPredicate) || currentStep.evalPredicates(vn)))
{
if (currentStep.nextS != null)
{
state = FORWARD;
currentStep = currentStep.nextS;
}
else
{
state = TERMINAL;
result = vn.getCurrentIndex2();
if (isUnique(result))
return result;
}
}
else
{
vn.pop2();
if (currentStep.hasPredicate)
currentStep.resetP(vn);
if (state == START)
state = END;
else
{
state = BACKWARD;
currentStep = currentStep.prevS;
}
}
}
break;
case END:
currentStep = null;
// reset();
return -1;
case BACKWARD:
case TERMINAL:
if (currentStep.prevS == null)
{
vn.pop2();
state = END;
break;
}
else
{
vn.pop2();
state = BACKWARD;
currentStep = currentStep.prevS;
break;
}
default:
throw new XPathEvalException("unknown state");
}
return -2;
}
private int process_ancestor(VTDNav vn)
{
int result;
bool b = false, b1 = false;
//int contextSize;
Predicate t = null;
switch (state)
{
case START:
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;
}
state = END;
if (vn.getCurrentDepth() != - 1)
{
vn.push2();
while (vn.toElement(VTDNav.P))
{
if (currentStep.eval(vn))
{
if (currentStep.NextStep != null)
{
state = FORWARD;
currentStep = currentStep.NextStep;
break;
}
else
{
//vn.pop();
state = TERMINAL;
result = vn.getCurrentIndex();
if (isUnique(result))
return result;
}
}
}
if (state == END)
{
currentStep.resetP(vn);
vn.pop2();
}
}
break;
case END:
currentStep = null;
// reset();
return - 1;
case FORWARD:
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;
vn.push2();
while (vn.toElement(VTDNav.P))
{
if (currentStep.eval(vn))
{
if (currentStep.NextStep != null)
{
state = FORWARD;
currentStep = currentStep.NextStep;
break;
}
else
{
//vn.pop();
state = TERMINAL;
result = vn.getCurrentIndex();
if (isUnique(result))
return result;
}
}
}
if (state == BACKWARD)
{
currentStep.resetP(vn);
vn.pop2();
currentStep = currentStep.PrevStep;
}
break;
case BACKWARD:
b = false;
vn.push2();
while (vn.toElement(VTDNav.P))
{
if (currentStep.eval(vn))
{
if (currentStep.NextStep != null)
{
state = FORWARD;
currentStep = currentStep.NextStep;
b = true;
break;
}
else
{
//vn.pop();
state = TERMINAL;
result = vn.getCurrentIndex();
if (isUnique(result))
return result;
}
}
}
if (b == false)
{
vn.pop2();
if (currentStep.PrevStep != null)
{
currentStep.resetP(vn);
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
else
{
state = END;
}
}
break;
case TERMINAL:
while (vn.toElement(VTDNav.P))
{
if (currentStep.eval(vn))
{
result = vn.getCurrentIndex();
if (isUnique(result))
return result;
}
}
vn.pop2();
if (currentStep.PrevStep != null)
{
currentStep.resetP(vn);
state = BACKWARD;
currentStep = currentStep.PrevStep;
}
else
{
state = END;
}
break;
default:
throw new XPathEvalException("unknown state");
}
return - 2;
}
