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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#include "txExpr.h"
#include "txNodeSet.h"
#include "txIXPathContext.h"
//-- Implementation of FilterExpr --/
//-----------------------------/
//- Virtual methods from Expr -/
//-----------------------------/
/**
* Evaluates this Expr based on the given context node and processor state
* @param context the context node for evaluation of this Expr
* @param ps the ProcessorState containing the stack information needed
* for evaluation
* @return the result of the evaluation
* @see Expr
**/
nsresult
FilterExpr::evaluate(txIEvalContext* aContext, txAExprResult** aResult)
{
*aResult = nullptr;
RefPtr<txAExprResult> exprRes;
nsresult rv = expr->evaluate(aContext, getter_AddRefs(exprRes));
NS_ENSURE_SUCCESS(rv, rv);
NS_ENSURE_TRUE(exprRes->getResultType() == txAExprResult::NODESET,
NS_ERROR_XSLT_NODESET_EXPECTED);
RefPtr<txNodeSet> nodes =
static_cast<txNodeSet*>(static_cast<txAExprResult*>(exprRes));
// null out exprRes so that we can test for shared-ness
exprRes = nullptr;
RefPtr<txNodeSet> nonShared;
rv = aContext->recycler()->getNonSharedNodeSet(nodes,
getter_AddRefs(nonShared));
NS_ENSURE_SUCCESS(rv, rv);
rv = evaluatePredicates(nonShared, aContext);
NS_ENSURE_SUCCESS(rv, rv);
*aResult = nonShared;
NS_ADDREF(*aResult);
return NS_OK;
} //-- evaluate
TX_IMPL_EXPR_STUBS_BASE(FilterExpr, NODESET_RESULT)
Expr*
FilterExpr::getSubExprAt(uint32_t aPos)
{
if (aPos == 0) {
return expr;
}
return PredicateList::getSubExprAt(aPos - 1);
}
void
FilterExpr::setSubExprAt(uint32_t aPos, Expr* aExpr)
{
if (aPos == 0) {
expr.forget();
expr = aExpr;
}
else {
PredicateList::setSubExprAt(aPos - 1, aExpr);
}
}
bool
FilterExpr::isSensitiveTo(ContextSensitivity aContext)
{
return expr->isSensitiveTo(aContext) ||
PredicateList::isSensitiveTo(aContext);
}
#ifdef TX_TO_STRING
void
FilterExpr::toString(nsAString& str)
{
if ( expr ) expr->toString(str);
else str.AppendLiteral("null");
PredicateList::toString(str);
}
#endif
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