/* -*- 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 "txIXPathContext.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 UnaryExpr::evaluate(txIEvalContext* aContext,
                             txAExprResult** aResult) {
  *aResult = nullptr;

  RefPtr<txAExprResult> exprRes;
  nsresult rv = expr->evaluate(aContext, getter_AddRefs(exprRes));
  NS_ENSURE_SUCCESS(rv, rv);

  double value = exprRes->numberValue();
#ifdef HPUX
  /*
   * Negation of a zero doesn't produce a negative
   * zero on HPUX. Perform the operation by multiplying with
   * -1.
   */
  return aContext->recycler()->getNumberResult(-1 * value, aResult);
#else
  return aContext->recycler()->getNumberResult(-value, aResult);
#endif
}

TX_IMPL_EXPR_STUBS_1(UnaryExpr, NODESET_RESULT, expr)

bool UnaryExpr::isSensitiveTo(ContextSensitivity aContext) {
  return expr->isSensitiveTo(aContext);
}

#ifdef TX_TO_STRING
void UnaryExpr::toString(nsAString& str) {
  if (!expr) return;
  str.Append(char16_t('-'));
  expr->toString(str);
}
#endif
