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