Package net.sf.saxon.expr

Examples of net.sf.saxon.expr.Expression

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     * Get the XPath expressions used in an array of WithParam parameters (add them to the supplied list)
     */

    public static void getXPathExpressions(WithParam[] params, List list) {
        for (int i=0; i<params.length; i++) {
            Expression exp = params[i].getSelectExpression();
            if (exp != null) {
                list.add(exp);
            }
        }
    }
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            for (int i = 0; i < topLevel.size(); i++) {
                NodeInfo node = (NodeInfo) topLevel.get(i);
                if (node instanceof StyleElement) {
                    StyleElement snode = (StyleElement) node;
                    //int module = putModuleNumber(snode.getSystemId());
                    Expression inst = snode.compile(exec);

                    if (inst instanceof ComputedExpression) {
                        ((ComputedExpression) inst).setLocationId(allocateLocationId(getSystemId(), snode.getLineNumber()));
                    }
                }
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                    } else {
                        compileError("Unknown XSL attribute " + namePool.getDisplayName(anameCode));
                    }
                } else {
                    attributeNames[numberOfAttributes] = anameCode;
                    Expression exp = makeAttributeValueTemplate(attributeList.getValue(i));
                    attributeValues[numberOfAttributes] = exp;

                    // if we can be sure the attribute value contains no special XML/HTML characters,
                    // we can save the trouble of checking it each time it is output.
                    // Note that the check includes characters that need to be escaped in a URL if the
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    * Type-check the expression. This simplifies the expression if the first argument is a singleton:
    * important as this is common for attribute value templates.
    */

    public Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException {
        Expression exp = super.analyze(env, contextItemType);
        if (exp instanceof StringJoin) {
            return ((StringJoin)exp).simplifySingleton();
        } else {
            return exp;
        }
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    /**
     * Simplify. Recognize remove(seq, 1) as a TailExpression.
     */

     public Expression simplify(StaticContext env) throws XPathException {
        Expression exp = super.simplify(env);
        if (exp instanceof Remove) {
            return ((Remove)exp).simplifyAsTailExpression();
        } else {
            return exp;
        }
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        // If the argument is a singleton, we evaluate the function
        // directly; otherwise we recurse to evaluate it once for each Item
        // in the sequence.

        Expression expression = argument[0];
        if (!Cardinality.allowsMany(expression.getCardinality())) {
            AtomicValue keyValue = (AtomicValue)argument[0].evaluateItem(context);
            if (keyValue == null) {
                return EmptyIterator.getInstance();
            }
            KeyManager keyManager = controller.getKeyManager();
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*/

public class Unordered extends CompileTimeFunction {

    public Expression analyze(StaticContext env, ItemType contextItemType) throws XPathException {
        Expression exp = super.analyze(env, contextItemType);
        if (exp instanceof Unordered) {
            return ExpressionTool.unsorted(((Unordered)exp).argument[0], true);
        }
        return exp;
    }
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        if ((contextNode == null) || !(contextNode instanceof Element) ||
                !(xpathExpr instanceof XPathExpressionImpl)) {
            return;
        }

        Expression expression = ((XPathExpressionImpl) xpathExpr).getInternalExpression();
        Iterator<Expression> subExpressions = (Iterator<Expression>) expression.iterateSubExpressions();

        if (!subExpressions.hasNext()) {
            return;
        }

        Expression subExpr = (Expression) subExpressions.next();

        if (!(subExpr instanceof PathExpression)) {
            return;
        }

        Document document = DOMUtils.toDOMDocument(contextNode);
        PathExpression pathExpr = (PathExpression) subExpr;
        Expression step = pathExpr.getFirstStep();

        while (step != null) {
            if (step instanceof AxisExpression) {
                AxisExpression axisExpr = (AxisExpression) step;

                NodeTest nodeTest = axisExpr.getNodeTest();

                if (!(nodeTest instanceof NameTest)) {
                    break;
                }

                NameTest nameTest = (NameTest) nodeTest;

                QName childName = getQualifiedName(nameTest.getFingerprint(),
                        namePool, contextUris);
               
                if (Axis.CHILD == axisExpr.getAxis()) {
                    if (NodeKindTest.ELEMENT.getNodeKindMask() != nameTest.getNodeKindMask()) {
                        break;
                    }
                 
                    NodeList children = ((Element) contextNode).getElementsByTagNameNS(childName.getNamespaceURI(),
                            childName.getLocalPart());
                    if ((children == null) || (children.getLength() == 0)) {
                        Node child = document.createElementNS(childName.getNamespaceURI(),
                                DOMUtils.getQualifiedName(childName));
                        contextNode.appendChild(child);
                        contextNode = child;
                    } else if (children.getLength() == 1) {
                        contextNode = children.item(0);
                    } else {
                        break;
                    }
                } else if (Axis.ATTRIBUTE == axisExpr.getAxis()) {
                    if (NodeKindTest.ATTRIBUTE.getNodeKindMask() != nameTest.getNodeKindMask()) {
                        break;
                    }
                   
                    Attr attribute = ((Element) contextNode).getAttributeNodeNS(childName.getNamespaceURI(), childName.getLocalPart());
                    if (attribute == null) {
                      attribute = document.createAttributeNS(childName.getNamespaceURI(), childName.getLocalPart());
                      ((Element) contextNode).setAttributeNode(attribute);
                      contextNode = attribute;
                    } else {
                      break;
                    }
                 
                } else {
                  break;
                }


            } else if (step instanceof ItemChecker) {
                ItemChecker itemChecker = (ItemChecker) step;
                Expression baseExpr = itemChecker.getBaseExpression();

                if (!(baseExpr instanceof VariableReference)) {
                    break;
                }
            } else {
                break;
            }

            if (pathExpr != null) {
                Expression remainingSteps = pathExpr.getRemainingSteps();

                if (remainingSteps instanceof PathExpression) {
                    pathExpr = (PathExpression) remainingSteps;
                    step = pathExpr.getFirstStep();
                } else if (remainingSteps instanceof AxisExpression) {
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                    } else {
                        compileError("Unknown XSL attribute " + namePool.getDisplayName(anameCode), "XTSE0805");
                    }
                } else {
                    attributeNames[numberOfAttributes] = anameCode;
                    Expression exp = makeAttributeValueTemplate(attributeList.getValue(i));
                    attributeValues[numberOfAttributes] = exp;
                    numberOfAttributes++;
                }
            }
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                        inheritNamespaces,
                        schemaType,
                        validation);

        inst.setBaseURI(getBaseURI());
        Expression content = compileSequenceConstructor(exec, iterateAxis(Axis.CHILD), true);

        if (numberOfAttributes > 0) {
            for (int i=attributeNames.length - 1; i>=0; i--) {
                FixedAttribute att = new FixedAttribute(
                        attributeNames[i],
                        Validation.STRIP,
                        null,
                        StandardNames.XS_UNTYPED_ATOMIC);
                try {
                    att.setSelect(attributeValues[i], exec.getConfiguration());
                } catch (XPathException err) {
                    compileError(err);
                }
                att.setLocationId(allocateLocationId(getSystemId(), getLineNumber()));
                Expression exp = att;
                if (getConfiguration().isCompileWithTracing()) {
                    TraceExpression trace = new TraceExpression(exp);
                    trace.setLineNumber(getLineNumber());
                    trace.setColumnNumber(-1);
                    trace.setSystemId(getSystemId());
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Related Classes of net.sf.saxon.expr.Expression

  • net.sf.saxon.event.SequenceReceiver
  • net.sf.saxon.evpull.EventIteratorOverSequence
  • net.sf.saxon.evpull.SingletonEventIterator
  • net.sf.saxon.functions.Document
  • net.sf.saxon.functions.FunctionLibraryList
  • net.sf.saxon.functions.Idref
  • net.sf.saxon.functions.Matches
  • net.sf.saxon.functions.Remove
  • net.sf.saxon.functions.Replace
  • net.sf.saxon.functions.StringJoin
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