1 files changed, 229 insertions, 0 deletions
diff --git a/dom/xslt/xpath/txPathExpr.cpp b/dom/xslt/xpath/txPathExpr.cpp
new file mode 100644
index 0000000000..79be4caa08
--- /dev/null
+++ b/dom/xslt/xpath/txPathExpr.cpp
@@ -0,0 +1,229 @@
+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* 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"
+
+using mozilla::Unused;
+using mozilla::WrapUnique;
+
+//------------/
+//- PathExpr -/
+//------------/
+
+/**
+ * Adds the Expr to this PathExpr
+ * @param expr the Expr to add to this PathExpr
+ **/
+void 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();
+  pxi->expr = WrapUnique(aExpr);
+  pxi->pathOp = aPathOp;
+}
+
+//-----------------------------/
+//- 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.get(), 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;
+  rv = aContext->isStripSpaceAllowed(aNode, filterWS);
+  NS_ENSURE_SUCCESS(rv, rv);
+
+  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");
+  Unused << mItems[aPos].expr.release();
+  mItems[aPos].expr = WrapUnique(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