1.1 --- /dev/null Thu Jan 01 00:00:00 1970 +0000
1.2 +++ b/dom/xslt/xpath/txBooleanExpr.cpp Wed Dec 31 06:09:35 2014 +0100
1.3 @@ -0,0 +1,81 @@
1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
1.8 +
1.9 +
1.10 +/**
1.11 + * Represents a BooleanExpr, a binary expression that
1.12 + * performs a boolean operation between its lvalue and rvalue.
1.13 +**/
1.14 +
1.15 +#include "txExpr.h"
1.16 +#include "txIXPathContext.h"
1.17 +
1.18 +/**
1.19 + * Evaluates this Expr based on the given context node and processor state
1.20 + * @param context the context node for evaluation of this Expr
1.21 + * @param ps the ContextState containing the stack information needed
1.22 + * for evaluation
1.23 + * @return the result of the evaluation
1.24 +**/
1.25 +nsresult
1.26 +BooleanExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
1.27 +{
1.28 + *aResult = nullptr;
1.29 +
1.30 + bool lval;
1.31 + nsresult rv = leftExpr->evaluateToBool(aContext, lval);
1.32 + NS_ENSURE_SUCCESS(rv, rv);
1.33 +
1.34 + // check for early decision
1.35 + if (op == OR && lval) {
1.36 + aContext->recycler()->getBoolResult(true, aResult);
1.37 +
1.38 + return NS_OK;
1.39 + }
1.40 + if (op == AND && !lval) {
1.41 + aContext->recycler()->getBoolResult(false, aResult);
1.42 +
1.43 + return NS_OK;
1.44 + }
1.45 +
1.46 + bool rval;
1.47 + rv = rightExpr->evaluateToBool(aContext, rval);
1.48 + NS_ENSURE_SUCCESS(rv, rv);
1.49 +
1.50 + // just use rval, since we already checked lval
1.51 + aContext->recycler()->getBoolResult(rval, aResult);
1.52 +
1.53 + return NS_OK;
1.54 +} //-- evaluate
1.55 +
1.56 +TX_IMPL_EXPR_STUBS_2(BooleanExpr, BOOLEAN_RESULT, leftExpr, rightExpr)
1.57 +
1.58 +bool
1.59 +BooleanExpr::isSensitiveTo(ContextSensitivity aContext)
1.60 +{
1.61 + return leftExpr->isSensitiveTo(aContext) ||
1.62 + rightExpr->isSensitiveTo(aContext);
1.63 +}
1.64 +
1.65 +#ifdef TX_TO_STRING
1.66 +void
1.67 +BooleanExpr::toString(nsAString& str)
1.68 +{
1.69 + if ( leftExpr ) leftExpr->toString(str);
1.70 + else str.AppendLiteral("null");
1.71 +
1.72 + switch ( op ) {
1.73 + case OR:
1.74 + str.AppendLiteral(" or ");
1.75 + break;
1.76 + default:
1.77 + str.AppendLiteral(" and ");
1.78 + break;
1.79 + }
1.80 + if ( rightExpr ) rightExpr->toString(str);
1.81 + else str.AppendLiteral("null");
1.82 +
1.83 +}
1.84 +#endif
