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-rw-r--r--dom/xslt/xpath/txPathExpr.cpp253
1 files changed, 253 insertions, 0 deletions
diff --git a/dom/xslt/xpath/txPathExpr.cpp b/dom/xslt/xpath/txPathExpr.cpp
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index 000000000..bcff47e9f
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+++ b/dom/xslt/xpath/txPathExpr.cpp
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+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "txExpr.h"
+#include "txNodeSet.h"
+#include "txNodeSetContext.h"
+#include "txSingleNodeContext.h"
+#include "txXMLUtils.h"
+#include "txXPathTreeWalker.h"
+
+ //------------/
+ //- PathExpr -/
+//------------/
+
+/**
+ * Adds the Expr to this PathExpr
+ * @param expr the Expr to add to this PathExpr
+**/
+nsresult
+PathExpr::addExpr(Expr* aExpr, PathOperator aPathOp)
+{
+ NS_ASSERTION(!mItems.IsEmpty() || aPathOp == RELATIVE_OP,
+ "First step has to be relative in PathExpr");
+ PathExprItem* pxi = mItems.AppendElement();
+ if (!pxi) {
+ return NS_ERROR_OUT_OF_MEMORY;
+ }
+ pxi->expr = aExpr;
+ pxi->pathOp = aPathOp;
+
+ return NS_OK;
+}
+
+ //-----------------------------/
+ //- Virtual methods from Expr -/
+//-----------------------------/
+
+/**
+ * Evaluates this Expr based on the given context node and processor state
+ * @param context the context node for evaluation of this Expr
+ * @param ps the ContextState containing the stack information needed
+ * for evaluation
+ * @return the result of the evaluation
+**/
+nsresult
+PathExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
+{
+ *aResult = nullptr;
+
+ // We need to evaluate the first step with the current context since it
+ // can depend on the context size and position. For example:
+ // key('books', concat('book', position()))
+ RefPtr<txAExprResult> res;
+ nsresult rv = mItems[0].expr->evaluate(aContext, getter_AddRefs(res));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ NS_ENSURE_TRUE(res->getResultType() == txAExprResult::NODESET,
+ NS_ERROR_XSLT_NODESET_EXPECTED);
+
+ RefPtr<txNodeSet> nodes = static_cast<txNodeSet*>
+ (static_cast<txAExprResult*>
+ (res));
+ if (nodes->isEmpty()) {
+ res.forget(aResult);
+
+ return NS_OK;
+ }
+ res = nullptr; // To allow recycling
+
+ // Evaluate remaining steps
+ uint32_t i, len = mItems.Length();
+ for (i = 1; i < len; ++i) {
+ PathExprItem& pxi = mItems[i];
+ RefPtr<txNodeSet> tmpNodes;
+ txNodeSetContext eContext(nodes, aContext);
+ while (eContext.hasNext()) {
+ eContext.next();
+
+ RefPtr<txNodeSet> resNodes;
+ if (pxi.pathOp == DESCENDANT_OP) {
+ rv = aContext->recycler()->getNodeSet(getter_AddRefs(resNodes));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ rv = evalDescendants(pxi.expr, eContext.getContextNode(),
+ &eContext, resNodes);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+ else {
+ RefPtr<txAExprResult> res;
+ rv = pxi.expr->evaluate(&eContext, getter_AddRefs(res));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ if (res->getResultType() != txAExprResult::NODESET) {
+ //XXX ErrorReport: report nonnodeset error
+ return NS_ERROR_XSLT_NODESET_EXPECTED;
+ }
+ resNodes = static_cast<txNodeSet*>
+ (static_cast<txAExprResult*>
+ (res));
+ }
+
+ if (tmpNodes) {
+ if (!resNodes->isEmpty()) {
+ RefPtr<txNodeSet> oldSet;
+ oldSet.swap(tmpNodes);
+ rv = aContext->recycler()->
+ getNonSharedNodeSet(oldSet, getter_AddRefs(tmpNodes));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ oldSet.swap(resNodes);
+ rv = aContext->recycler()->
+ getNonSharedNodeSet(oldSet, getter_AddRefs(resNodes));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ tmpNodes->addAndTransfer(resNodes);
+ }
+ }
+ else {
+ tmpNodes = resNodes;
+ }
+ }
+ nodes = tmpNodes;
+ if (nodes->isEmpty()) {
+ break;
+ }
+ }
+
+ *aResult = nodes;
+ NS_ADDREF(*aResult);
+
+ return NS_OK;
+} //-- evaluate
+
+/**
+ * Selects from the descendants of the context node
+ * all nodes that match the Expr
+**/
+nsresult
+PathExpr::evalDescendants(Expr* aStep, const txXPathNode& aNode,
+ txIMatchContext* aContext, txNodeSet* resNodes)
+{
+ txSingleNodeContext eContext(aNode, aContext);
+ RefPtr<txAExprResult> res;
+ nsresult rv = aStep->evaluate(&eContext, getter_AddRefs(res));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ if (res->getResultType() != txAExprResult::NODESET) {
+ //XXX ErrorReport: report nonnodeset error
+ return NS_ERROR_XSLT_NODESET_EXPECTED;
+ }
+
+ txNodeSet* oldSet = static_cast<txNodeSet*>
+ (static_cast<txAExprResult*>(res));
+ RefPtr<txNodeSet> newSet;
+ rv = aContext->recycler()->getNonSharedNodeSet(oldSet,
+ getter_AddRefs(newSet));
+ NS_ENSURE_SUCCESS(rv, rv);
+
+ resNodes->addAndTransfer(newSet);
+
+ bool filterWS = aContext->isStripSpaceAllowed(aNode);
+
+ txXPathTreeWalker walker(aNode);
+ if (!walker.moveToFirstChild()) {
+ return NS_OK;
+ }
+
+ do {
+ const txXPathNode& node = walker.getCurrentPosition();
+ if (!(filterWS && txXPathNodeUtils::isText(node) &&
+ txXPathNodeUtils::isWhitespace(node))) {
+ rv = evalDescendants(aStep, node, aContext, resNodes);
+ NS_ENSURE_SUCCESS(rv, rv);
+ }
+ } while (walker.moveToNextSibling());
+
+ return NS_OK;
+} //-- evalDescendants
+
+Expr::ExprType
+PathExpr::getType()
+{
+ return PATH_EXPR;
+}
+
+TX_IMPL_EXPR_STUBS_BASE(PathExpr, NODESET_RESULT)
+
+Expr*
+PathExpr::getSubExprAt(uint32_t aPos)
+{
+ return aPos < mItems.Length() ? mItems[aPos].expr.get() : nullptr;
+}
+void
+PathExpr::setSubExprAt(uint32_t aPos, Expr* aExpr)
+{
+ NS_ASSERTION(aPos < mItems.Length(), "setting bad subexpression index");
+ mItems[aPos].expr.forget();
+ mItems[aPos].expr = aExpr;
+}
+
+
+bool
+PathExpr::isSensitiveTo(ContextSensitivity aContext)
+{
+ if (mItems[0].expr->isSensitiveTo(aContext)) {
+ return true;
+ }
+
+ // We're creating a new node/nodeset so we can ignore those bits.
+ Expr::ContextSensitivity context =
+ aContext & ~(Expr::NODE_CONTEXT | Expr::NODESET_CONTEXT);
+ if (context == NO_CONTEXT) {
+ return false;
+ }
+
+ uint32_t i, len = mItems.Length();
+ for (i = 0; i < len; ++i) {
+ NS_ASSERTION(!mItems[i].expr->isSensitiveTo(Expr::NODESET_CONTEXT),
+ "Step cannot depend on nodeset-context");
+ if (mItems[i].expr->isSensitiveTo(context)) {
+ return true;
+ }
+ }
+
+ return false;
+}
+
+#ifdef TX_TO_STRING
+void
+PathExpr::toString(nsAString& dest)
+{
+ if (!mItems.IsEmpty()) {
+ NS_ASSERTION(mItems[0].pathOp == RELATIVE_OP,
+ "First step should be relative");
+ mItems[0].expr->toString(dest);
+ }
+
+ uint32_t i, len = mItems.Length();
+ for (i = 1; i < len; ++i) {
+ switch (mItems[i].pathOp) {
+ case DESCENDANT_OP:
+ dest.AppendLiteral("//");
+ break;
+ case RELATIVE_OP:
+ dest.Append(char16_t('/'));
+ break;
+ }
+ mItems[i].expr->toString(dest);
+ }
+}
+#endif