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