The Tor Browser / file diff

     1.1 --- /dev/null	Thu Jan 01 00:00:00 1970 +0000
     1.2 +++ b/dom/xslt/xpath/txPredicateList.cpp	Wed Dec 31 06:09:35 2014 +0100
     1.3 @@ -0,0 +1,85 @@
     1.4 +/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
     1.5 +/* This Source Code Form is subject to the terms of the Mozilla Public
     1.6 + * License, v. 2.0. If a copy of the MPL was not distributed with this
     1.7 + * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
     1.8 +
     1.9 +#include "txExpr.h"
    1.10 +#include "txNodeSet.h"
    1.11 +#include "txNodeSetContext.h"
    1.12 +
    1.13 +/*
    1.14 + * Represents an ordered list of Predicates,
    1.15 + * for use with Step and Filter Expressions
    1.16 + */
    1.17 +
    1.18 +nsresult
    1.19 +PredicateList::evaluatePredicates(txNodeSet* nodes,
    1.20 +                                  txIMatchContext* aContext)
    1.21 +{
    1.22 +    NS_ASSERTION(nodes, "called evaluatePredicates with nullptr NodeSet");
    1.23 +    nsresult rv = NS_OK;
    1.24 +
    1.25 +    uint32_t i, len = mPredicates.Length();
    1.26 +    for (i = 0; i < len && !nodes->isEmpty(); ++i) {
    1.27 +        txNodeSetContext predContext(nodes, aContext);
    1.28 +        /*
    1.29 +         * add nodes to newNodes that match the expression
    1.30 +         * or, if the result is a number, add the node with the right
    1.31 +         * position
    1.32 +         */
    1.33 +        int32_t index = 0;
    1.34 +        while (predContext.hasNext()) {
    1.35 +            predContext.next();
    1.36 +            nsRefPtr<txAExprResult> exprResult;
    1.37 +            rv = mPredicates[i]->evaluate(&predContext,
    1.38 +                                          getter_AddRefs(exprResult));
    1.39 +            NS_ENSURE_SUCCESS(rv, rv);
    1.40 +
    1.41 +            // handle default, [position() == numberValue()]
    1.42 +            if (exprResult->getResultType() == txAExprResult::NUMBER) {
    1.43 +                if ((double)predContext.position() == exprResult->numberValue()) {
    1.44 +                    nodes->mark(index);
    1.45 +                }
    1.46 +            }
    1.47 +            else if (exprResult->booleanValue()) {
    1.48 +                nodes->mark(index);
    1.49 +            }
    1.50 +            ++index;
    1.51 +        }
    1.52 +        // sweep the non-marked nodes
    1.53 +        nodes->sweep();
    1.54 +    }
    1.55 +
    1.56 +    return NS_OK;
    1.57 +}
    1.58 +
    1.59 +bool
    1.60 +PredicateList::isSensitiveTo(Expr::ContextSensitivity aContext)
    1.61 +{
    1.62 +    // We're creating a new node/nodeset so we can ignore those bits.
    1.63 +    Expr::ContextSensitivity context =
    1.64 +        aContext & ~(Expr::NODE_CONTEXT | Expr::NODESET_CONTEXT);
    1.65 +    if (context == Expr::NO_CONTEXT) {
    1.66 +        return false;
    1.67 +    }
    1.68 +
    1.69 +    uint32_t i, len = mPredicates.Length();
    1.70 +    for (i = 0; i < len; ++i) {
    1.71 +        if (mPredicates[i]->isSensitiveTo(context)) {
    1.72 +            return true;
    1.73 +        }
    1.74 +    }
    1.75 +
    1.76 +    return false;
    1.77 +}
    1.78 +
    1.79 +#ifdef TX_TO_STRING
    1.80 +void PredicateList::toString(nsAString& dest)
    1.81 +{
    1.82 +    for (uint32_t i = 0; i < mPredicates.Length(); ++i) {
    1.83 +        dest.Append(char16_t('['));
    1.84 +        mPredicates[i]->toString(dest);
    1.85 +        dest.Append(char16_t(']'));
    1.86 +    }
    1.87 +}
    1.88 +#endif