mirror of
https://github.com/classilla/tenfourfox.git
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326 lines
9.1 KiB
C++
326 lines
9.1 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/*
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Implementation of an XPath LocationStep
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*/
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#include "txExpr.h"
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#include "txIXPathContext.h"
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#include "txNodeSet.h"
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#include "txXPathTreeWalker.h"
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//-----------------------------/
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//- Virtual methods from Expr -/
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//-----------------------------/
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/**
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* Evaluates this Expr based on the given context node and processor state
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* @param context the context node for evaluation of this Expr
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* @param ps the ProcessorState containing the stack information needed
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* for evaluation
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* @return the result of the evaluation
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* @see Expr
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**/
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nsresult
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LocationStep::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
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{
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NS_ASSERTION(aContext, "internal error");
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*aResult = nullptr;
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RefPtr<txNodeSet> nodes;
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nsresult rv = aContext->recycler()->getNodeSet(getter_AddRefs(nodes));
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NS_ENSURE_SUCCESS(rv, rv);
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txXPathTreeWalker walker(aContext->getContextNode());
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switch (mAxisIdentifier) {
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case ANCESTOR_AXIS:
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{
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if (!walker.moveToParent()) {
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break;
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}
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// do not break here
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}
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case ANCESTOR_OR_SELF_AXIS:
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{
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nodes->setReverse();
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do {
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if (mNodeTest->matches(walker.getCurrentPosition(), aContext)) {
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nodes->append(walker.getCurrentPosition());
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}
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} while (walker.moveToParent());
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break;
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}
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case ATTRIBUTE_AXIS:
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{
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if (!walker.moveToFirstAttribute()) {
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break;
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}
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do {
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if (mNodeTest->matches(walker.getCurrentPosition(), aContext)) {
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nodes->append(walker.getCurrentPosition());
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}
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} while (walker.moveToNextAttribute());
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break;
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}
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case DESCENDANT_OR_SELF_AXIS:
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{
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if (mNodeTest->matches(walker.getCurrentPosition(), aContext)) {
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nodes->append(walker.getCurrentPosition());
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}
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// do not break here
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}
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case DESCENDANT_AXIS:
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{
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fromDescendants(walker.getCurrentPosition(), aContext, nodes);
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break;
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}
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case FOLLOWING_AXIS:
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{
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if (txXPathNodeUtils::isAttribute(walker.getCurrentPosition())) {
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walker.moveToParent();
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fromDescendants(walker.getCurrentPosition(), aContext, nodes);
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}
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bool cont = true;
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while (!walker.moveToNextSibling()) {
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if (!walker.moveToParent()) {
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cont = false;
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break;
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}
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}
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while (cont) {
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if (mNodeTest->matches(walker.getCurrentPosition(), aContext)) {
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nodes->append(walker.getCurrentPosition());
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}
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fromDescendants(walker.getCurrentPosition(), aContext, nodes);
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while (!walker.moveToNextSibling()) {
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if (!walker.moveToParent()) {
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cont = false;
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break;
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}
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}
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}
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break;
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}
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case FOLLOWING_SIBLING_AXIS:
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{
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while (walker.moveToNextSibling()) {
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if (mNodeTest->matches(walker.getCurrentPosition(), aContext)) {
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nodes->append(walker.getCurrentPosition());
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}
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}
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break;
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}
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case NAMESPACE_AXIS: //-- not yet implemented
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#if 0
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// XXX DEBUG OUTPUT
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cout << "namespace axis not yet implemented"<<endl;
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#endif
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break;
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case PARENT_AXIS :
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{
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if (walker.moveToParent() &&
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mNodeTest->matches(walker.getCurrentPosition(), aContext)) {
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nodes->append(walker.getCurrentPosition());
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}
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break;
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}
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case PRECEDING_AXIS:
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{
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nodes->setReverse();
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bool cont = true;
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while (!walker.moveToPreviousSibling()) {
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if (!walker.moveToParent()) {
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cont = false;
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break;
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}
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}
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while (cont) {
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fromDescendantsRev(walker.getCurrentPosition(), aContext, nodes);
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if (mNodeTest->matches(walker.getCurrentPosition(), aContext)) {
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nodes->append(walker.getCurrentPosition());
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}
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while (!walker.moveToPreviousSibling()) {
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if (!walker.moveToParent()) {
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cont = false;
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break;
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}
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}
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}
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break;
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}
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case PRECEDING_SIBLING_AXIS:
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{
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nodes->setReverse();
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while (walker.moveToPreviousSibling()) {
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if (mNodeTest->matches(walker.getCurrentPosition(), aContext)) {
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nodes->append(walker.getCurrentPosition());
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}
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}
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break;
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}
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case SELF_AXIS:
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{
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if (mNodeTest->matches(walker.getCurrentPosition(), aContext)) {
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nodes->append(walker.getCurrentPosition());
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}
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break;
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}
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default: // Children Axis
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{
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if (!walker.moveToFirstChild()) {
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break;
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}
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do {
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if (mNodeTest->matches(walker.getCurrentPosition(), aContext)) {
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nodes->append(walker.getCurrentPosition());
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}
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} while (walker.moveToNextSibling());
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break;
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}
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}
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// Apply predicates
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if (!isEmpty()) {
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rv = evaluatePredicates(nodes, aContext);
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NS_ENSURE_SUCCESS(rv, rv);
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}
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nodes->unsetReverse();
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NS_ADDREF(*aResult = nodes);
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return NS_OK;
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}
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void LocationStep::fromDescendants(const txXPathNode& aNode,
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txIMatchContext* aCs,
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txNodeSet* aNodes)
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{
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txXPathTreeWalker walker(aNode);
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if (!walker.moveToFirstChild()) {
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return;
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}
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do {
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const txXPathNode& child = walker.getCurrentPosition();
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if (mNodeTest->matches(child, aCs)) {
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aNodes->append(child);
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}
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fromDescendants(child, aCs, aNodes);
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} while (walker.moveToNextSibling());
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}
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void LocationStep::fromDescendantsRev(const txXPathNode& aNode,
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txIMatchContext* aCs,
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txNodeSet* aNodes)
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{
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txXPathTreeWalker walker(aNode);
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if (!walker.moveToLastChild()) {
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return;
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}
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do {
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const txXPathNode& child = walker.getCurrentPosition();
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fromDescendantsRev(child, aCs, aNodes);
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if (mNodeTest->matches(child, aCs)) {
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aNodes->append(child);
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}
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} while (walker.moveToPreviousSibling());
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}
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Expr::ExprType
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LocationStep::getType()
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{
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return LOCATIONSTEP_EXPR;
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}
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TX_IMPL_EXPR_STUBS_BASE(LocationStep, NODESET_RESULT)
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Expr*
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LocationStep::getSubExprAt(uint32_t aPos)
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{
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return PredicateList::getSubExprAt(aPos);
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}
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void
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LocationStep::setSubExprAt(uint32_t aPos, Expr* aExpr)
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{
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PredicateList::setSubExprAt(aPos, aExpr);
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}
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bool
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LocationStep::isSensitiveTo(ContextSensitivity aContext)
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{
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return (aContext & NODE_CONTEXT) ||
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mNodeTest->isSensitiveTo(aContext) ||
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PredicateList::isSensitiveTo(aContext);
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}
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#ifdef TX_TO_STRING
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void
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LocationStep::toString(nsAString& str)
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{
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switch (mAxisIdentifier) {
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case ANCESTOR_AXIS :
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str.AppendLiteral("ancestor::");
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break;
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case ANCESTOR_OR_SELF_AXIS :
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str.AppendLiteral("ancestor-or-self::");
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break;
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case ATTRIBUTE_AXIS:
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str.Append(char16_t('@'));
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break;
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case DESCENDANT_AXIS:
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str.AppendLiteral("descendant::");
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break;
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case DESCENDANT_OR_SELF_AXIS:
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str.AppendLiteral("descendant-or-self::");
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break;
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case FOLLOWING_AXIS :
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str.AppendLiteral("following::");
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break;
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case FOLLOWING_SIBLING_AXIS:
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str.AppendLiteral("following-sibling::");
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break;
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case NAMESPACE_AXIS:
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str.AppendLiteral("namespace::");
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break;
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case PARENT_AXIS :
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str.AppendLiteral("parent::");
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break;
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case PRECEDING_AXIS :
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str.AppendLiteral("preceding::");
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break;
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case PRECEDING_SIBLING_AXIS :
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str.AppendLiteral("preceding-sibling::");
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break;
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case SELF_AXIS :
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str.AppendLiteral("self::");
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break;
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default:
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break;
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}
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NS_ASSERTION(mNodeTest, "mNodeTest is null, that's verboten");
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mNodeTest->toString(str);
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PredicateList::toString(str);
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}
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#endif
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