C++ Ptr::operands方法代码示例

void CallTargetDescription::checkArgumentsCircularity(CallTargetDescription::List &signList,
                                                      const Expression::Ptr callsite)
{
    /* Check the arguments. */
    const Expression::List ops(callsite->operands());
    const Expression::List::const_iterator end(ops.constEnd());
    Expression::List::const_iterator it(ops.constBegin());

    for(; it != end; ++it)
        checkCallsiteCircularity(signList, *it);
}

bool ValueComparison::isCaseInsensitiveCompare(Expression::Ptr &op1, Expression::Ptr &op2)
{
    Q_ASSERT(op1);
    Q_ASSERT(op2);

    const ID iD = op1->id();

    if((iD == IDLowerCaseFN || iD == IDUpperCaseFN) && iD == op2->id())
    {
        /* Both are either fn:lower-case() or fn:upper-case(). */

        /* Replace the calls to the functions with its operands. */
        op1 = op1->operands().first();
        op2 = op2->operands().first();

        return true;
    }
    else
        return false;
}

Expression::Ptr TypeChecker::verifyType(const Expression::Ptr &operand,
                                        const SequenceType::Ptr &reqSeqType,
                                        const StaticContext::Ptr &context,
                                        const ReportContext::ErrorCode code,
                                        const Options options)
{
    const ItemType::Ptr reqType(reqSeqType->itemType());
    const Expression::Properties props(operand->properties());

    /* If operand requires a focus, do the necessary type checking for that. */
    if(props.testFlag(Expression::RequiresFocus) && options.testFlag(CheckFocus))
    {
        const ItemType::Ptr contextType(context->contextItemType());
        if(contextType)
        {
            if(props.testFlag(Expression::RequiresContextItem))
            {
                Q_ASSERT_X(operand->expectedContextItemType(), Q_FUNC_INFO,
                           "When the Expression sets the RequiresContextItem property, it must "
                           "return a type in expectedContextItemType()");
                const ItemType::Ptr expectedContextType(operand->expectedContextItemType());

                /* Allow the empty sequence. We don't want to trigger XPTY0020 on ()/... . */
                if(!expectedContextType->xdtTypeMatches(contextType) && contextType != CommonSequenceTypes::Empty)
                {
                    context->error(wrongType(context->namePool(), operand->expectedContextItemType(), contextType),
                                   ReportContext::XPTY0020, operand.data());
                    return operand;
                }
            }
        }
        else
        {
            context->error(QtXmlPatterns::tr("The focus is undefined."), ReportContext::XPDY0002, operand.data());
            return operand;
        }
    }

    SequenceType::Ptr operandSeqType(operand->staticType());
    ItemType::Ptr operandType(operandSeqType->itemType());

    /* This returns the operand if the types are identical or if operandType
     * is a subtype of reqType. */
    if(reqType->xdtTypeMatches(operandType) || *operandType == *CommonSequenceTypes::Empty)
        return operand;

    /* Since we haven't exited yet, it means that the operandType is a super type
     * of reqType, and that there hence is a path down to it through the
     * type hierachy -- but that doesn't necessarily mean that a up-cast(down the
     * hierarchy) would succeed. */

    Expression::Ptr result(operand);

    if(reqType->isAtomicType())
    {
        const Expression::ID opID = operand->id();
        if((opID == Expression::IDArgumentReference ||
                (opID == Expression::IDCardinalityVerifier && operand->operands().first()->is(Expression::IDArgumentReference)))
                && *BuiltinTypes::item == *operandType)
            return Expression::Ptr(new ArgumentConverter(result, reqType));

        if(!operandType->isAtomicType())
        {
            result = Expression::Ptr(new Atomizer(result));
            /* The atomizer might know more about the type. */
            operandType = result->staticType()->itemType();
        }

        if(reqType->xdtTypeMatches(operandType))
        {
            /* Atomization was sufficient. Either the expected type is xs:anyAtomicType
             * or the type the Atomizer knows it returns, matches the required type. */
            return result;
        }

        const bool compatModeEnabled = context->compatModeEnabled();

        if((options.testFlag(AutomaticallyConvert) && BuiltinTypes::xsUntypedAtomic->xdtTypeMatches(operandType)) ||
                (compatModeEnabled && BuiltinTypes::xsString->xdtTypeMatches(reqType)))
        {
            if(*reqType == *BuiltinTypes::numeric)
            {
                result = typeCheck(new UntypedAtomicConverter(result, BuiltinTypes::xsDouble, code),
                                   context, reqSeqType);
            }
            else
                result = typeCheck(new UntypedAtomicConverter(result, reqType, code), context, reqSeqType);

            /* The UntypedAtomicConverter might know more about the type, so reload. */
            operandType = result->staticType()->itemType();
        }
        else if(compatModeEnabled && *reqType == *BuiltinTypes::xsDouble)
        {
            const FunctionFactory::Ptr functions(context->functionSignatures());
            Expression::List numberArgs;
            numberArgs.append(operand);

            result = functions->createFunctionCall(QXmlName(StandardNamespaces::fn, StandardLocalNames::number),
                                                   numberArgs,
                                                   context,
//.........这里部分代码省略.........

Expression::Ptr Expression::invokeOptimizers(const Expression::Ptr &expr,
                                             const StaticContext::Ptr &context)
{
    Q_ASSERT(expr);

    const OptimizationPass::List opts(expr->optimizationPasses());

    if(opts.isEmpty()) /* Early exit. */
    {
        return expr;
    }

    const OptimizationPass::List::const_iterator passEnd(opts.constEnd());
    const OptimizationPass::List::const_iterator end(opts.constEnd());
    OptimizationPass::List::const_iterator passIt(opts.constBegin());

    for(; passIt != passEnd; ++passIt) /* Invoke each optimization pass. */
    {
        const OptimizationPass::Ptr pass(*passIt); /* Alias, for readability. */
        OptimizationPass::ExpressionMarker sourceMarker(pass->sourceExpression);

        if(pass->startIdentifier && !pass->startIdentifier->matches(expr))
        {
            /* This pass specified a start identifier and it did
             * not match -- let's try the next OptimizationPass. */
            continue;
        }

        const ExpressionIdentifier::List::const_iterator idEnd(pass->operandIdentifiers.constEnd());
        ExpressionIdentifier::List::const_iterator idIt(pass->operandIdentifiers.constBegin());
        const Expression::List ops(expr->operands());
        const Expression::List::const_iterator opEnd(ops.constEnd());
        Expression::List::const_iterator opIt(ops.constBegin());

        switch(pass->operandsMatchMethod)
        {
            case OptimizationPass::Sequential:
            {
                for(; opIt != opEnd; ++opIt)
                {
                    const Expression::Ptr operand(*opIt); /* Alias, for readability. */
                    const ExpressionIdentifier::Ptr opIdentifier(*idIt); /* Alias, for readability. */
                    if(opIdentifier && !opIdentifier->matches(operand))
                    {
                        break;
                    }

                    ++idIt;
                }

                if(opIt == opEnd)
                    break; /* All operands matched, so this pass matched. */
                else
                {
                    /* The loop above did not finish which means all operands did not match.
                       Therefore, this OptimizationPass did not match -- let's try the next one. */
                    continue;
                }
            }
            case OptimizationPass::AnyOrder:
            {
                Q_ASSERT_X(ops.count() == 2, Q_FUNC_INFO,
                           "AnyOrder is currently only supported for Expressions with two operands.");
                if(pass->operandIdentifiers.first()->matches(ops.first()) &&
                   pass->operandIdentifiers.last()->matches(ops.last()))
                {
                    break;
                }
                else if(pass->operandIdentifiers.first()->matches(ops.last()) &&
                        pass->operandIdentifiers.last()->matches(ops.first()))
                {
                    sourceMarker.first() = 1;
                    sourceMarker[1] = 0;
                    break; /* This pass matched. */
                }
                else
                    continue; /* This pass didn't match, let's loop through the next pass. */
            }
        }

        /* Figure out the source Expression, if any. */
        Expression::List operands;
        Expression::Ptr sourceExpr;

        if(!sourceMarker.isEmpty())
        {
            const OptimizationPass::ExpressionMarker::const_iterator mEnd(sourceMarker.constEnd());
            OptimizationPass::ExpressionMarker::const_iterator mIt(sourceMarker.constBegin());
            sourceExpr = expr;

            for(; mIt != mEnd; ++mIt)
            {
                Q_ASSERT(*mIt >= 0);
                sourceExpr = sourceExpr->operands().at(*mIt);
            }

            operands.append(sourceExpr);
        }

        if(operands.isEmpty())
//.........这里部分代码省略.........