1 files changed, 210 insertions, 0 deletions
diff --git a/dom/xslt/xpath/XPathExpression.cpp b/dom/xslt/xpath/XPathExpression.cpp
new file mode 100644
index 0000000000..0706763d79
--- /dev/null
+++ b/dom/xslt/xpath/XPathExpression.cpp
@@ -0,0 +1,210 @@
+/* -*- 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 "XPathExpression.h"
+
+#include <utility>
+
+#include "XPathResult.h"
+#include "mozilla/dom/BindingUtils.h"
+#include "mozilla/dom/Text.h"
+#include "mozilla/dom/XPathResultBinding.h"
+#include "nsError.h"
+#include "nsINode.h"
+#include "txExpr.h"
+#include "txExprResult.h"
+#include "txIXPathContext.h"
+#include "txURIUtils.h"
+#include "txXPathTreeWalker.h"
+
+namespace mozilla::dom {
+
+class EvalContextImpl : public txIEvalContext {
+ public:
+  EvalContextImpl(const txXPathNode& aContextNode, uint32_t aContextPosition,
+                  uint32_t aContextSize, txResultRecycler* aRecycler)
+      : mContextNode(aContextNode),
+        mContextPosition(aContextPosition),
+        mContextSize(aContextSize),
+        mLastError(NS_OK),
+        mRecycler(aRecycler) {}
+
+  nsresult getError() { return mLastError; }
+
+  TX_DECL_EVAL_CONTEXT;
+
+ private:
+  const txXPathNode& mContextNode;
+  uint32_t mContextPosition;
+  uint32_t mContextSize;
+  nsresult mLastError;
+  RefPtr<txResultRecycler> mRecycler;
+};
+
+XPathExpression::XPathExpression(UniquePtr<Expr>&& aExpression,
+                                 txResultRecycler* aRecycler,
+                                 Document* aDocument)
+    : mExpression(std::move(aExpression)),
+      mRecycler(aRecycler),
+      mDocument(do_GetWeakReference(aDocument)),
+      mCheckDocument(aDocument != nullptr) {}
+
+XPathExpression::~XPathExpression() = default;
+
+already_AddRefed<XPathResult> XPathExpression::EvaluateWithContext(
+    JSContext* aCx, nsINode& aContextNode, uint32_t aContextPosition,
+    uint32_t aContextSize, uint16_t aType, JS::Handle<JSObject*> aInResult,
+    ErrorResult& aRv) {
+  RefPtr<XPathResult> inResult;
+  if (aInResult) {
+    nsresult rv = UNWRAP_OBJECT(XPathResult, aInResult, inResult);
+    if (NS_FAILED(rv) && rv != NS_ERROR_XPC_BAD_CONVERT_JS) {
+      aRv.Throw(rv);
+      return nullptr;
+    }
+  }
+
+  return EvaluateWithContext(aContextNode, aContextPosition, aContextSize,
+                             aType, inResult, aRv);
+}
+
+already_AddRefed<XPathResult> XPathExpression::EvaluateWithContext(
+    nsINode& aContextNode, uint32_t aContextPosition, uint32_t aContextSize,
+    uint16_t aType, XPathResult* aInResult, ErrorResult& aRv) {
+  if (aContextPosition > aContextSize) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  if (aType > XPathResult_Binding::FIRST_ORDERED_NODE_TYPE) {
+    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+    return nullptr;
+  }
+
+  if (!nsContentUtils::LegacyIsCallerNativeCode() &&
+      !nsContentUtils::CanCallerAccess(&aContextNode)) {
+    aRv.Throw(NS_ERROR_DOM_SECURITY_ERR);
+    return nullptr;
+  }
+
+  if (mCheckDocument) {
+    nsCOMPtr<Document> doc = do_QueryReferent(mDocument);
+    if (doc != aContextNode.OwnerDoc()) {
+      aRv.Throw(NS_ERROR_DOM_WRONG_DOCUMENT_ERR);
+      return nullptr;
+    }
+  }
+
+  uint16_t nodeType = aContextNode.NodeType();
+
+  if (nodeType == nsINode::TEXT_NODE ||
+      nodeType == nsINode::CDATA_SECTION_NODE) {
+    Text* textNode = aContextNode.GetAsText();
+    MOZ_ASSERT(textNode);
+
+    uint32_t textLength = textNode->Length();
+    if (textLength == 0) {
+      aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+      return nullptr;
+    }
+
+    // XXX Need to get logical XPath text node for CDATASection
+    //     and Text nodes.
+  } else if (nodeType != nsINode::DOCUMENT_NODE &&
+             nodeType != nsINode::ELEMENT_NODE &&
+             nodeType != nsINode::ATTRIBUTE_NODE &&
+             nodeType != nsINode::COMMENT_NODE &&
+             nodeType != nsINode::PROCESSING_INSTRUCTION_NODE) {
+    aRv.Throw(NS_ERROR_DOM_NOT_SUPPORTED_ERR);
+    return nullptr;
+  }
+
+  UniquePtr<txXPathNode> contextNode(
+      txXPathNativeNode::createXPathNode(&aContextNode));
+  if (!contextNode) {
+    aRv.Throw(NS_ERROR_FAILURE);
+    return nullptr;
+  }
+
+  EvalContextImpl eContext(*contextNode, aContextPosition, aContextSize,
+                           mRecycler);
+  RefPtr<txAExprResult> exprResult;
+  aRv = mExpression->evaluate(&eContext, getter_AddRefs(exprResult));
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  uint16_t resultType = aType;
+  if (aType == XPathResult::ANY_TYPE) {
+    short exprResultType = exprResult->getResultType();
+    switch (exprResultType) {
+      case txAExprResult::NUMBER:
+        resultType = XPathResult::NUMBER_TYPE;
+        break;
+      case txAExprResult::STRING:
+        resultType = XPathResult::STRING_TYPE;
+        break;
+      case txAExprResult::BOOLEAN:
+        resultType = XPathResult::BOOLEAN_TYPE;
+        break;
+      case txAExprResult::NODESET:
+        resultType = XPathResult::UNORDERED_NODE_ITERATOR_TYPE;
+        break;
+      case txAExprResult::RESULT_TREE_FRAGMENT:
+        aRv.Throw(NS_ERROR_FAILURE);
+        return nullptr;
+    }
+  }
+
+  RefPtr<XPathResult> xpathResult = aInResult;
+  if (!xpathResult) {
+    xpathResult = new XPathResult(&aContextNode);
+  }
+
+  xpathResult->SetExprResult(exprResult, resultType, &aContextNode, aRv);
+  if (aRv.Failed()) {
+    return nullptr;
+  }
+
+  return xpathResult.forget();
+}
+
+/*
+ * Implementation of the txIEvalContext private to XPathExpression
+ * EvalContextImpl bases on only one context node and no variables
+ */
+
+nsresult EvalContextImpl::getVariable(int32_t aNamespace, nsAtom* aLName,
+                                      txAExprResult*& aResult) {
+  aResult = 0;
+  return NS_ERROR_INVALID_ARG;
+}
+
+nsresult EvalContextImpl::isStripSpaceAllowed(const txXPathNode& aNode,
+                                              bool& aAllowed) {
+  aAllowed = false;
+
+  return NS_OK;
+}
+
+void* EvalContextImpl::getPrivateContext() {
+  // we don't have a private context here.
+  return nullptr;
+}
+
+txResultRecycler* EvalContextImpl::recycler() { return mRecycler; }
+
+void EvalContextImpl::receiveError(const nsAString& aMsg, nsresult aRes) {
+  mLastError = aRes;
+  // forward aMsg to console service?
+}
+
+const txXPathNode& EvalContextImpl::getContextNode() { return mContextNode; }
+
+uint32_t EvalContextImpl::size() { return mContextSize; }
+
+uint32_t EvalContextImpl::position() { return mContextPosition; }
+
+}  // namespace mozilla::dom