The Tor Browser / file comparison
comparison: dom/xslt/xpath/txPredicateList.cpp
dom/xslt/xpath/txPredicateList.cpp
- branch
- TOR_BUG_9701
- changeset 15
- b8a032363ba2
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| -1:000000000000 | 0:2f3e5f569f10 |
|---|---|
| 1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */ | |
| 2 /* This Source Code Form is subject to the terms of the Mozilla Public | |
| 3 * License, v. 2.0. If a copy of the MPL was not distributed with this | |
| 4 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */ | |
| 5 | |
| 6 #include "txExpr.h" | |
| 7 #include "txNodeSet.h" | |
| 8 #include "txNodeSetContext.h" | |
| 9 | |
| 10 /* | |
| 11 * Represents an ordered list of Predicates, | |
| 12 * for use with Step and Filter Expressions | |
| 13 */ | |
| 14 | |
| 15 nsresult | |
| 16 PredicateList::evaluatePredicates(txNodeSet* nodes, | |
| 17 txIMatchContext* aContext) | |
| 18 { | |
| 19 NS_ASSERTION(nodes, "called evaluatePredicates with nullptr NodeSet"); | |
| 20 nsresult rv = NS_OK; | |
| 21 | |
| 22 uint32_t i, len = mPredicates.Length(); | |
| 23 for (i = 0; i < len && !nodes->isEmpty(); ++i) { | |
| 24 txNodeSetContext predContext(nodes, aContext); | |
| 25 /* | |
| 26 * add nodes to newNodes that match the expression | |
| 27 * or, if the result is a number, add the node with the right | |
| 28 * position | |
| 29 */ | |
| 30 int32_t index = 0; | |
| 31 while (predContext.hasNext()) { | |
| 32 predContext.next(); | |
| 33 nsRefPtr<txAExprResult> exprResult; | |
| 34 rv = mPredicates[i]->evaluate(&predContext, | |
| 35 getter_AddRefs(exprResult)); | |
| 36 NS_ENSURE_SUCCESS(rv, rv); | |
| 37 | |
| 38 // handle default, [position() == numberValue()] | |
| 39 if (exprResult->getResultType() == txAExprResult::NUMBER) { | |
| 40 if ((double)predContext.position() == exprResult->numberValue()) { | |
| 41 nodes->mark(index); | |
| 42 } | |
| 43 } | |
| 44 else if (exprResult->booleanValue()) { | |
| 45 nodes->mark(index); | |
| 46 } | |
| 47 ++index; | |
| 48 } | |
| 49 // sweep the non-marked nodes | |
| 50 nodes->sweep(); | |
| 51 } | |
| 52 | |
| 53 return NS_OK; | |
| 54 } | |
| 55 | |
| 56 bool | |
| 57 PredicateList::isSensitiveTo(Expr::ContextSensitivity aContext) | |
| 58 { | |
| 59 // We're creating a new node/nodeset so we can ignore those bits. | |
| 60 Expr::ContextSensitivity context = | |
| 61 aContext & ~(Expr::NODE_CONTEXT | Expr::NODESET_CONTEXT); | |
| 62 if (context == Expr::NO_CONTEXT) { | |
| 63 return false; | |
| 64 } | |
| 65 | |
| 66 uint32_t i, len = mPredicates.Length(); | |
| 67 for (i = 0; i < len; ++i) { | |
| 68 if (mPredicates[i]->isSensitiveTo(context)) { | |
| 69 return true; | |
| 70 } | |
| 71 } | |
| 72 | |
| 73 return false; | |
| 74 } | |
| 75 | |
| 76 #ifdef TX_TO_STRING | |
| 77 void PredicateList::toString(nsAString& dest) | |
| 78 { | |
| 79 for (uint32_t i = 0; i < mPredicates.Length(); ++i) { | |
| 80 dest.Append(char16_t('[')); | |
| 81 mPredicates[i]->toString(dest); | |
| 82 dest.Append(char16_t(']')); | |
| 83 } | |
| 84 } | |
| 85 #endif |
