@Override
public void endUnaryExpr(int operator) {
FunctionCall functionCall = new FunctionCall(Functions.MULTIPLY);
functionCall.addValidMember(new Literal(-1d, DataType.NUMBER), 0);
functionCall.addMember(pop(), 1);
push(functionCall.simplify());
}
private void endBinaryOperator(Function function) {
FunctionCall functionCall = new FunctionCall(function);
Object member2 = pop();
Object member1 = pop();
functionCall.addMember(member1, 0);
functionCall.addMember(member2, 1);
push(functionCall.simplify());
}
@Override
public void endPredicate() {
predicateDepth--;
Object predicate = pop();
Predicated predicated = (Predicated) peek();
Expression predicateExpr;
if (predicate instanceof Expression) {
predicateExpr = (Expression) predicate;
if (predicateExpr.resultType == DataType.NUMBER) {
if (predicate instanceof Literal) {
Double d = (Double) predicateExpr.getResult();
int pos = d.intValue();
if (d != pos) predicateExpr = new Literal(Boolean.FALSE, DataType.BOOLEAN);
else {
Step step = predicated instanceof Step ? (Step) predicated : null;
if (step != null
&& (step.axis == Axis.SELF
|| ((step.axis == Axis.ATTRIBUTE || step.axis == Axis.NAMESPACE)
&& step.constraint instanceof QName)
|| step.predicateSet.getPredicate() instanceof ExactPosition))
predicateExpr = new Literal(pos == 1, DataType.BOOLEAN);
else predicateExpr = new ExactPosition(pos);
}
} else {
FunctionCall equals = new FunctionCall(Functions.NUMBER_EQUALS_NUMBER);
equals.addValidMember(new Position(), 0);
equals.addValidMember(predicateExpr, 1);
predicateExpr = equals;
}
} else predicateExpr = Functions.typeCast(predicateExpr, DataType.BOOLEAN);
} else predicateExpr = Functions.typeCast(predicate, DataType.BOOLEAN);
if (predicated instanceof LocationPath) {
LocationPath path = (LocationPath) predicated;
if (path.contexts.size() == 0) {
LocationPath newPath = new LocationPath(Scope.LOCAL, 0);
newPath.contexts.add(path);
pop();
push(newPath);
predicated = newPath;
}
}
predicated.addPredicate(predicateExpr);
}
@Override
public void endFunction() throws SAXPathException {
ArrayDeque params = popFrame();
javax.xml.namespace.QName name = (javax.xml.namespace.QName) params.pollFirst();
if (name.getNamespaceURI().length() == 0)
push(createFunction(name.getLocalPart(), params).simplify());
else {
int noOfParams = params.size();
XPathFunction function = functionResolver.resolveFunction(name, noOfParams);
if (function == null) throw new SAXPathException("Unknown Function: " + name);
FunctionCall functionCall =
new FunctionCall(
new Functions.UserFunction(name.getNamespaceURI(), name.getLocalPart(), function),
noOfParams);
for (int i = 0; i < noOfParams; i++) functionCall.addMember(params.pollFirst(), i);
push(functionCall);
}
}
private Expression createFunction(String name, ArrayDeque params) throws SAXPathException {
int noOfParams = params.size();
switch (noOfParams) {
case 0:
{
LocationPath locationPath =
predicateDepth == 0 ? LocationPath.DOCUMENT_CONTEXT : LocationPath.LOCAL_CONTEXT;
Expression expr = locationPath.apply(name);
if (expr != null) return expr;
return createFunction(name, 0);
}
case 1:
{
if (name.equals("lang")) {
langInterested = true;
FunctionCall functionCall = new FunctionCall(Functions.LANGUAGE_MATCH);
functionCall.addValidMember(new Language(), 0);
functionCall.addMember(params.pollFirst(), 1);
return functionCall;
} else {
Object current = params.pollFirst();
if (current instanceof LocationPath) {
Expression expr = ((LocationPath) current).apply(name);
if (expr != null) return expr;
}
FunctionCall functionCall = (FunctionCall) createFunction(name, 1);
functionCall.addMember(current, 0);
return functionCall;
}
}
default:
FunctionCall functionCall = (FunctionCall) createFunction(name, noOfParams);
for (int i = 0; i < noOfParams; i++) functionCall.addMember(params.pollFirst(), i);
return functionCall;
}
}
