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: #include "txExpr.h"
michael@0: #include "txNodeSet.h"
michael@0: #include "txIXPathContext.h"
michael@0: 
michael@0: //-- Implementation of FilterExpr --/
michael@0: 
michael@0:   //-----------------------------/
michael@0:  //- Virtual methods from Expr -/
michael@0: //-----------------------------/
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 ProcessorState containing the stack information needed
michael@0:  * for evaluation
michael@0:  * @return the result of the evaluation
michael@0:  * @see Expr
michael@0: **/
michael@0: nsresult
michael@0: FilterExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
michael@0: {
michael@0:     *aResult = nullptr;
michael@0: 
michael@0:     nsRefPtr<txAExprResult> exprRes;
michael@0:     nsresult rv = expr->evaluate(aContext, getter_AddRefs(exprRes));
michael@0:     NS_ENSURE_SUCCESS(rv, rv);
michael@0: 
michael@0:     NS_ENSURE_TRUE(exprRes->getResultType() == txAExprResult::NODESET,
michael@0:                    NS_ERROR_XSLT_NODESET_EXPECTED);
michael@0: 
michael@0:     nsRefPtr<txNodeSet> nodes =
michael@0:         static_cast<txNodeSet*>(static_cast<txAExprResult*>(exprRes));
michael@0:     // null out exprRes so that we can test for shared-ness
michael@0:     exprRes = nullptr;
michael@0: 
michael@0:     nsRefPtr<txNodeSet> nonShared;
michael@0:     rv = aContext->recycler()->getNonSharedNodeSet(nodes,
michael@0:                                                    getter_AddRefs(nonShared));
michael@0:     NS_ENSURE_SUCCESS(rv, rv);
michael@0: 
michael@0:     rv = evaluatePredicates(nonShared, aContext);
michael@0:     NS_ENSURE_SUCCESS(rv, rv);
michael@0: 
michael@0:     *aResult = nonShared;
michael@0:     NS_ADDREF(*aResult);
michael@0: 
michael@0:     return NS_OK;
michael@0: } //-- evaluate
michael@0: 
michael@0: TX_IMPL_EXPR_STUBS_BASE(FilterExpr, NODESET_RESULT)
michael@0: 
michael@0: Expr*
michael@0: FilterExpr::getSubExprAt(uint32_t aPos)
michael@0: {
michael@0:     if (aPos == 0) {
michael@0:       return expr;
michael@0:     }
michael@0:     return PredicateList::getSubExprAt(aPos - 1);
michael@0: }
michael@0: 
michael@0: void
michael@0: FilterExpr::setSubExprAt(uint32_t aPos, Expr* aExpr)
michael@0: {
michael@0:     if (aPos == 0) {
michael@0:       expr.forget();
michael@0:       expr = aExpr;
michael@0:     }
michael@0:     else {
michael@0:       PredicateList::setSubExprAt(aPos - 1, aExpr);
michael@0:     }
michael@0: }
michael@0: 
michael@0: bool
michael@0: FilterExpr::isSensitiveTo(ContextSensitivity aContext)
michael@0: {
michael@0:     return expr->isSensitiveTo(aContext) ||
michael@0:            PredicateList::isSensitiveTo(aContext);
michael@0: }
michael@0: 
michael@0: #ifdef TX_TO_STRING
michael@0: void
michael@0: FilterExpr::toString(nsAString& str)
michael@0: {
michael@0:     if ( expr ) expr->toString(str);
michael@0:     else str.AppendLiteral("null");
michael@0:     PredicateList::toString(str);
michael@0: }
michael@0: #endif
michael@0: