/* -*- 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 "txIXPathContext.h"
#include "txXPathTreeWalker.h"

/**
 * 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 RootExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult) {
  txXPathTreeWalker walker(aContext->getContextNode());
  walker.moveToRoot();

  return aContext->recycler()->getNodeSet(walker.getCurrentPosition(), aResult);
}

TX_IMPL_EXPR_STUBS_0(RootExpr, NODESET_RESULT)

bool RootExpr::isSensitiveTo(ContextSensitivity aContext) {
  return !!(aContext & NODE_CONTEXT);
}

#ifdef TX_TO_STRING
void RootExpr::toString(nsAString& dest) {
  if (mSerialize) dest.Append(char16_t('/'));
}
#endif