86 lines
2.5 KiB
C++
86 lines
2.5 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 "txNodeSetContext.h"
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/*
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* Represents an ordered list of Predicates,
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* for use with Step and Filter Expressions
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*/
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nsresult
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PredicateList::evaluatePredicates(txNodeSet* nodes,
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txIMatchContext* aContext)
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{
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NS_ASSERTION(nodes, "called evaluatePredicates with nullptr NodeSet");
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nsresult rv = NS_OK;
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uint32_t i, len = mPredicates.Length();
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for (i = 0; i < len && !nodes->isEmpty(); ++i) {
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txNodeSetContext predContext(nodes, aContext);
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/*
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* add nodes to newNodes that match the expression
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* or, if the result is a number, add the node with the right
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* position
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*/
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int32_t index = 0;
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while (predContext.hasNext()) {
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predContext.next();
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RefPtr<txAExprResult> exprResult;
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rv = mPredicates[i]->evaluate(&predContext,
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getter_AddRefs(exprResult));
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NS_ENSURE_SUCCESS(rv, rv);
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// handle default, [position() == numberValue()]
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if (exprResult->getResultType() == txAExprResult::NUMBER) {
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if ((double)predContext.position() == exprResult->numberValue()) {
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nodes->mark(index);
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}
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}
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else if (exprResult->booleanValue()) {
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nodes->mark(index);
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}
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++index;
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}
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// sweep the non-marked nodes
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nodes->sweep();
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}
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return NS_OK;
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}
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bool
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PredicateList::isSensitiveTo(Expr::ContextSensitivity aContext)
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{
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// We're creating a new node/nodeset so we can ignore those bits.
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Expr::ContextSensitivity context =
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aContext & ~(Expr::NODE_CONTEXT | Expr::NODESET_CONTEXT);
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if (context == Expr::NO_CONTEXT) {
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return false;
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}
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uint32_t i, len = mPredicates.Length();
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for (i = 0; i < len; ++i) {
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if (mPredicates[i]->isSensitiveTo(context)) {
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return true;
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}
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}
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return false;
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}
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#ifdef TX_TO_STRING
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void PredicateList::toString(nsAString& dest)
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{
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for (uint32_t i = 0; i < mPredicates.Length(); ++i) {
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dest.Append(char16_t('['));
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mPredicates[i]->toString(dest);
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dest.Append(char16_t(']'));
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}
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}
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#endif
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