tor-browser

The Tor Browser
git clone https://git.dasho.dev/tor-browser.git
Log | Files | Refs | README | LICENSE

txBooleanExpr.cpp (2064B)

      1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
      2 /* This Source Code Form is subject to the terms of the Mozilla Public
      3 * License, v. 2.0. If a copy of the MPL was not distributed with this
      4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
      5 
      6 /**
      7 * Represents a BooleanExpr, a binary expression that
      8 * performs a boolean operation between its lvalue and rvalue.
      9 **/
     10 
     11 #include "txExpr.h"
     12 #include "txIXPathContext.h"
     13 
     14 /**
     15 * Evaluates this Expr based on the given context node and processor state
     16 * @param context the context node for evaluation of this Expr
     17 * @param ps the ContextState containing the stack information needed
     18 * for evaluation
     19 * @return the result of the evaluation
     20 **/
     21 nsresult BooleanExpr::evaluate(txIEvalContext* aContext,
     22                               txAExprResult** aResult) {
     23  *aResult = nullptr;
     24 
     25  bool lval;
     26  nsresult rv = leftExpr->evaluateToBool(aContext, lval);
     27  NS_ENSURE_SUCCESS(rv, rv);
     28 
     29  // check for early decision
     30  if (op == OR && lval) {
     31    aContext->recycler()->getBoolResult(true, aResult);
     32 
     33    return NS_OK;
     34  }
     35  if (op == AND && !lval) {
     36    aContext->recycler()->getBoolResult(false, aResult);
     37 
     38    return NS_OK;
     39  }
     40 
     41  bool rval;
     42  rv = rightExpr->evaluateToBool(aContext, rval);
     43  NS_ENSURE_SUCCESS(rv, rv);
     44 
     45  // just use rval, since we already checked lval
     46  aContext->recycler()->getBoolResult(rval, aResult);
     47 
     48  return NS_OK;
     49 }  //-- evaluate
     50 
     51 TX_IMPL_EXPR_STUBS_2(BooleanExpr, BOOLEAN_RESULT, leftExpr, rightExpr)
     52 
     53 bool BooleanExpr::isSensitiveTo(ContextSensitivity aContext) {
     54  return leftExpr->isSensitiveTo(aContext) ||
     55         rightExpr->isSensitiveTo(aContext);
     56 }
     57 
     58 #ifdef TX_TO_STRING
     59 void BooleanExpr::toString(nsAString& str) {
     60  if (leftExpr)
     61    leftExpr->toString(str);
     62  else
     63    str.AppendLiteral("null");
     64 
     65  switch (op) {
     66    case OR:
     67      str.AppendLiteral(" or ");
     68      break;
     69    default:
     70      str.AppendLiteral(" and ");
     71      break;
     72  }
     73  if (rightExpr)
     74    rightExpr->toString(str);
     75  else
     76    str.AppendLiteral("null");
     77 }
     78 #endif