C++ staticcontext::Ptr类代码示例

Expression::Ptr TypeAvailableFN::typeCheck(const StaticContext::Ptr &context,
                                           const SequenceType::Ptr &reqType)
{
    m_schemaTypeFactory = context->schemaDefinitions();
    return StaticNamespacesContainer::typeCheck(context, reqType);
}

Expression::Ptr DefaultCollationFN::typeCheck(const StaticContext::Ptr &context,
                                              const SequenceType::Ptr &reqType)
{
    return wrapLiteral(AtomicString::fromValue(context->defaultCollation().toString()), context, this)->typeCheck(context, reqType);
}

Expression::Ptr ExpressionFactory::createExpression(const QString &expr,
                                                    const StaticContext::Ptr &context,
                                                    const LanguageAccent lang,
                                                    const SequenceType::Ptr &requiredType,
                                                    const QUrl &queryURI)
{
    pDebug() << Q_FUNC_INFO << queryURI;
    Q_ASSERT(context);
    Q_ASSERT(requiredType);
    Q_ASSERT(queryURI.isValid());

    OptimizationPasses::Coordinator::init();

    ParserContext::Ptr info(new ParserContext(context, lang,
                                              Tokenizer::Ptr(new XQueryTokenizer(expr, queryURI))));

    const int bisonRetval = XPathparse(info.data());

    Q_ASSERT_X(bisonRetval == 0, Q_FUNC_INFO,
               "We shouldn't be able to get an error, because we throw exceptions.");
    Q_UNUSED(bisonRetval); /* Needed when not compiled in debug mode, since bisonRetval won't
                            * be used in the Q_ASSERT_X above. */

    Expression::Ptr result(info->queryBody);

    if(!result)
    {
        context->error(QtXmlPatterns::tr("A library module cannot be evaluated "
                                         "directly. It must be imported from a "
                                         "main module."),
                       ReportContext::XPST0003,
                       QSourceLocation(queryURI, 1, 1));
    }

    /* Here, we type check user declared functions and global variables. This means
     * that variables and functions that are not used are type checked(which they otherwise
     * wouldn't have been), and those which are used, are type-checked twice, unfortunately. */

    const UserFunction::List::const_iterator end(info->userFunctions.constEnd());
    UserFunction::List::const_iterator it(info->userFunctions.constBegin());
    for(; it != end; ++it)
    {
        pDebug() << "-----      User Function Typecheck      -----";
        registerLastPath((*it)->body());

        /* We will most likely call body()->typeCheck() again, once for each callsite. That is, it will
         * be called from UserFunctionCallsite::typeCheck(), which will be called indirectly when
         * we check the query body. */
        const Expression::Ptr typeCheck((*it)->body()->typeCheck(context, (*it)->signature()->returnType()));
        /* We don't have to call (*it)->setBody(typeCheck) here since it's only used directly below. */
        processTreePass(typeCheck, UserFunctionTypeCheck);
        pDebug() << "------------------------------";

        pDebug() << "-----      User Function Compress      -----";
        const Expression::Ptr comp(typeCheck->compress(context));
        (*it)->setBody(comp);
        processTreePass(comp, UserFunctionCompression);
        pDebug() << "------------------------------";
    }

    const VariableDeclaration::Stack::const_iterator vend(info->variables.constEnd());
    VariableDeclaration::Stack::const_iterator vit(info->variables.constBegin());
    for(; vit != vend; ++vit)
    {
        Q_ASSERT(*vit);
        /* If it's already used, it will be typeChecked later on. */
        if((*vit)->isUsed() || (*vit)->type == VariableDeclaration::ExternalVariable)
            continue;

        pDebug() << "-----      Global Variable Typecheck      -----";
        Q_ASSERT((*vit)->expression());
        /* We supply ZeroOrMoreItems, meaning the variable can evaluate to anything. */
        // FIXME which is a source to bugs
        // TODO What about compressing variables?
        const Expression::Ptr
        nev((*vit)->expression()->typeCheck(context, CommonSequenceTypes::ZeroOrMoreItems));
        processTreePass(nev, GlobalVariableTypeCheck);
        pDebug() << "------------------------------";
    }

    pDebug() << "----- Initial AST build. -----";
    processTreePass(result, QueryBodyInitial);
    pDebug() << "------------------------------";

    pDebug() << "-----     Type Check     -----";
    registerLastPath(result);
    result->rewrite(result, result->typeCheck(context, requiredType), context);
    processTreePass(result, QueryBodyTypeCheck);
    pDebug() << "------------------------------";

    pDebug() << "-----      Compress      -----";
    result->rewrite(result, result->compress(context), context);
    processTreePass(result, QueryBodyCompression);
    pDebug() << "------------------------------";

    return result;
}

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 neccessarily 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.........