michael@0: /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
michael@0: /* This Source Code Form is subject to the terms of the Mozilla Public
michael@0:  * License, v. 2.0. If a copy of the MPL was not distributed with this
michael@0:  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
michael@0: 
michael@0: 
michael@0: /**
michael@0:  * Represents a BooleanExpr, a binary expression that
michael@0:  * performs a boolean operation between its lvalue and rvalue.
michael@0: **/
michael@0: 
michael@0: #include "txExpr.h"
michael@0: #include "txIXPathContext.h"
michael@0: 
michael@0: /**
michael@0:  * Evaluates this Expr based on the given context node and processor state
michael@0:  * @param context the context node for evaluation of this Expr
michael@0:  * @param ps the ContextState containing the stack information needed
michael@0:  * for evaluation
michael@0:  * @return the result of the evaluation
michael@0: **/
michael@0: nsresult
michael@0: BooleanExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
michael@0: {
michael@0:     *aResult = nullptr;
michael@0: 
michael@0:     bool lval;
michael@0:     nsresult rv = leftExpr->evaluateToBool(aContext, lval);
michael@0:     NS_ENSURE_SUCCESS(rv, rv);
michael@0:     
michael@0:     // check for early decision
michael@0:     if (op == OR && lval) {
michael@0:         aContext->recycler()->getBoolResult(true, aResult);
michael@0:         
michael@0:         return NS_OK;
michael@0:     }
michael@0:     if (op == AND && !lval) {
michael@0:         aContext->recycler()->getBoolResult(false, aResult);
michael@0: 
michael@0:         return NS_OK;
michael@0:     }
michael@0: 
michael@0:     bool rval;
michael@0:     rv = rightExpr->evaluateToBool(aContext, rval);
michael@0:     NS_ENSURE_SUCCESS(rv, rv);
michael@0: 
michael@0:     // just use rval, since we already checked lval
michael@0:     aContext->recycler()->getBoolResult(rval, aResult);
michael@0: 
michael@0:     return NS_OK;
michael@0: } //-- evaluate
michael@0: 
michael@0: TX_IMPL_EXPR_STUBS_2(BooleanExpr, BOOLEAN_RESULT, leftExpr, rightExpr)
michael@0: 
michael@0: bool
michael@0: BooleanExpr::isSensitiveTo(ContextSensitivity aContext)
michael@0: {
michael@0:     return leftExpr->isSensitiveTo(aContext) ||
michael@0:            rightExpr->isSensitiveTo(aContext);
michael@0: }
michael@0: 
michael@0: #ifdef TX_TO_STRING
michael@0: void
michael@0: BooleanExpr::toString(nsAString& str)
michael@0: {
michael@0:     if ( leftExpr ) leftExpr->toString(str);
michael@0:     else str.AppendLiteral("null");
michael@0: 
michael@0:     switch ( op ) {
michael@0:         case OR:
michael@0:             str.AppendLiteral(" or ");
michael@0:             break;
michael@0:         default:
michael@0:             str.AppendLiteral(" and ");
michael@0:             break;
michael@0:     }
michael@0:     if ( rightExpr ) rightExpr->toString(str);
michael@0:     else str.AppendLiteral("null");
michael@0: 
michael@0: }
michael@0: #endif