C++ QDeclarativeError类代码示例

QDeclarativeInfo::~QDeclarativeInfo()
{
    if (0 == --d->ref) {
        QList<QDeclarativeError> errors = d->errors;

        QDeclarativeEngine *engine = 0;

        if (!d->buffer.isEmpty()) {
            QDeclarativeError error;

            QObject *object = const_cast<QObject *>(d->object);

            if (object) {
                engine = qmlEngine(d->object);
                QString typeName;
                QDeclarativeType *type = QDeclarativeMetaType::qmlType(object->metaObject());
                if (type) {
                    typeName = QLatin1String(type->qmlTypeName());
                    int lastSlash = typeName.lastIndexOf(QLatin1Char('/'));
                    if (lastSlash != -1)
                        typeName = typeName.mid(lastSlash+1);
                } else {
                    typeName = QString::fromUtf8(object->metaObject()->className());
                    int marker = typeName.indexOf(QLatin1String("_QMLTYPE_"));
                    if (marker != -1)
                        typeName = typeName.left(marker);

                    marker = typeName.indexOf(QLatin1String("_QML_"));
                    if (marker != -1) {
                        typeName = typeName.left(marker) + "*";
                        type = QDeclarativeMetaType::qmlType(QMetaType::type(typeName.toLatin1()));
                        if (type) {
                            typeName = QLatin1String(type->qmlTypeName());
                            int lastSlash = typeName.lastIndexOf(QLatin1Char('/'));
                            if (lastSlash != -1)
                                typeName = typeName.mid(lastSlash+1);
                        }
                    }
                }

                d->buffer.prepend(QLatin1String("QML ") + typeName + QLatin1String(": "));

                QDeclarativeData *ddata = QDeclarativeData::get(object, false);
                if (ddata && ddata->outerContext && !ddata->outerContext->url.isEmpty()) {
                    error.setUrl(ddata->outerContext->url);
                    error.setLine(ddata->lineNumber);
                    error.setColumn(ddata->columnNumber);
                }
            }

            error.setDescription(d->buffer);

            errors.prepend(error);
        }

        QDeclarativeEnginePrivate::warning(engine, errors);

        delete d;
    }
}

/*!
    Load the QDeclarativeComponent from the provided \a url.

    Ensure that the URL provided is full and correct, in particular, use
    \l QUrl::fromLocalFile() when loading a file from the local filesystem.
*/
void QDeclarativeComponent::loadUrl(const QUrl &url)
{
    Q_D(QDeclarativeComponent);

    d->clear();

    if ((url.isRelative() && !url.isEmpty())
    || url.scheme() == QLatin1String("file")) // Workaround QTBUG-11929
        d->url = d->engine->baseUrl().resolved(url);
    else
        d->url = url;

    if (url.isEmpty()) {
        QDeclarativeError error;
        error.setDescription(tr("Invalid empty URL"));
        d->state.errors << error;
        return;
    }

    QDeclarativeTypeData *data = QDeclarativeEnginePrivate::get(d->engine)->typeLoader.get(d->url);

    if (data->isCompleteOrError()) {
        d->fromTypeData(data);
        d->progress = 1.0;
    } else {
        d->typeData = data;
        d->typeData->registerCallback(d);
        d->progress = data->progress();
    }

    emit statusChanged(status());
    emit progressChanged(d->progress);
}

/*!
    Reports an error in parsing \a prop, with the given \a description.

    An error is generated referring to the position of \a node in the source file.
*/
void QDeclarativeCustomParser::error(const QDeclarativeCustomParserProperty& prop, const QString& description)
{
    QDeclarativeError error;
    QString exceptionDescription;
    error.setLine(prop.location().line);
    error.setColumn(prop.location().column);
    error.setDescription(description);
    exceptions << error;
}

void QDeclarativeDirParser::reportError(int line, int column, const QString &description)
{
    QDeclarativeError error;
    error.setUrl(_url);
    error.setLine(line);
    error.setColumn(column);
    error.setDescription(description);
    _errors.append(error);
}

/*!
    Reports an error with the given \a description.

    This can only be used during the compile() step. For errors during setCustomData(), use qmlInfo().

    An error is generated referring to the position of the element in the source file.
*/
void QDeclarativeCustomParser::error(const QString& description)
{
    Q_ASSERT(object);
    QDeclarativeError error;
    QString exceptionDescription;
    error.setLine(object->location.start.line);
    error.setColumn(object->location.start.column);
    error.setDescription(description);
    exceptions << error;
}

/*!
    Loads a QDeclarativeDomDocument from \a data.  \a data should be valid QML
    data.  On success, true is returned.  If the \a data is malformed, false
    is returned and QDeclarativeDomDocument::errors() contains an error description.

    \sa QDeclarativeDomDocument::loadError()
*/
bool QDeclarativeDomDocument::load(QDeclarativeEngine *engine, const QByteArray &data, const QUrl &url)
{
    d->errors.clear();
    d->imports.clear();

    QDeclarativeEnginePrivate *ep = QDeclarativeEnginePrivate::get(engine);
    QDeclarativeTypeData *td = ep->typeLoader.get(data, url, QDeclarativeTypeLoader::PreserveParser);

    if(td->isError()) {
        d->errors = td->errors();
        td->release();
        return false;
    } else if(!td->isCompleteOrError()) {
        QDeclarativeError error;
        error.setDescription(QLatin1String("QDeclarativeDomDocument supports local types only"));
        d->errors << error;
        td->release();
        return false;
    }

    for (int i = 0; i < td->parser().imports().size(); ++i) {
        QDeclarativeScriptParser::Import parserImport = td->parser().imports().at(i);
        QDeclarativeDomImport domImport;
        domImport.d->type = static_cast<QDeclarativeDomImportPrivate::Type>(parserImport.type);
        domImport.d->uri = parserImport.uri;
        domImport.d->qualifier = parserImport.qualifier;
        domImport.d->version = parserImport.version;
        d->imports += domImport;
    }

    if (td->parser().tree()) {
        d->root = td->parser().tree();
        d->root->addref();
    }

    td->release();
    return true;
}

QDebug operator<<(QDebug debug, const QDeclarativeError &error)
{
    debug << error.toString().toUtf8().constData();

    QUrl url = error.url();

    if (error.line() > 0 && url.scheme() == QLatin1String("file")) {
        QString file = url.toLocalFile();
        QFile f(file);
        if (f.open(QIODevice::ReadOnly)) {
            QByteArray data = f.readAll();
            QTextStream stream(data, QIODevice::ReadOnly);
#ifndef QT_NO_TEXTCODEC
            stream.setCodec("UTF-8");
#endif
            const QString code = stream.readAll();
            const QStringList lines = code.split(QLatin1Char('\n'));

            if (lines.count() >= error.line()) {
                const QString &line = lines.at(error.line() - 1);
                debug << "\n    " << qPrintable(line);

                if(error.column() > 0) {
                    int column = qMax(0, error.column() - 1);
                    column = qMin(column, line.length());

                    QByteArray ind;
                    ind.reserve(column);
                    for (int i = 0; i < column; ++i) {
                        const QChar ch = line.at(i);
                        if (ch.isSpace())
                            ind.append(ch.unicode());
                        else
                            ind.append(' ');
                    }
                    ind.append('^');
                    debug << "\n    " << ind.constData();
                }
            }
        }
    }
    return debug;
}

void tst_qdeclarativeerror::url()
{
    QDeclarativeError error;

    QCOMPARE(error.url(), QUrl());

    error.setUrl(QUrl("http://www.nokia.com/main.qml"));

    QCOMPARE(error.url(), QUrl("http://www.nokia.com/main.qml"));

    QDeclarativeError error2 = error;

    QCOMPARE(error2.url(), QUrl("http://www.nokia.com/main.qml"));

    error.setUrl(QUrl("http://qt.nokia.com/main.qml"));

    QCOMPARE(error.url(), QUrl("http://qt.nokia.com/main.qml"));
    QCOMPARE(error2.url(), QUrl("http://www.nokia.com/main.qml"));
}

void tst_qdeclarativeerror::line()
{
    QDeclarativeError error;

    QCOMPARE(error.line(), -1);

    error.setLine(102);

    QCOMPARE(error.line(), 102);

    QDeclarativeError error2 = error;

    QCOMPARE(error2.line(), 102);

    error.setLine(4);

    QCOMPARE(error.line(), 4);
    QCOMPARE(error2.line(), 102);
}

void tst_qdeclarativeerror::debug()
{
    {
        QDeclarativeError error;
        error.setUrl(QUrl("http://www.qt-project.org/main.qml"));
        error.setDescription("An Error");
        error.setLine(92);
        error.setColumn(13);

        QTest::ignoreMessage(QtWarningMsg, "http://www.qt-project.org/main.qml:92:13: An Error ");
        qWarning() << error;
    }

    {
        QUrl url(QUrl::fromLocalFile(QString(SRCDIR) + "/").resolved(QUrl("test.txt")));
        QDeclarativeError error;
        error.setUrl(url);
        error.setDescription("An Error");
        error.setLine(2);
        error.setColumn(5);

        QString out = url.toString() + ":2:5: An Error \n     Line2 Content \n         ^ ";
        QTest::ignoreMessage(QtWarningMsg, qPrintable(out));

        qWarning() << error;
    }

    {
        QUrl url(QUrl::fromLocalFile(QString(SRCDIR) + "/").resolved(QUrl("foo.txt")));
        QDeclarativeError error;
        error.setUrl(url);
        error.setDescription("An Error");
        error.setLine(2);
        error.setColumn(5);

        QString out = url.toString() + ":2:5: An Error ";
        QTest::ignoreMessage(QtWarningMsg, qPrintable(out));

        qWarning() << error;
    }
}

void tst_qdeclarativeerror::copy()
{
    QDeclarativeError error;
    error.setUrl(QUrl("http://www.qt-project.org/main.qml"));
    error.setDescription("An Error");
    error.setLine(92);
    error.setColumn(13);

    QDeclarativeError error2(error);
    QDeclarativeError error3;
    error3 = error;

    error.setUrl(QUrl("http://www.qt-project.org/main.qml"));
    error.setDescription("Another Error");
    error.setLine(2);
    error.setColumn(33);

    QCOMPARE(error.url(), QUrl("http://www.qt-project.org/main.qml"));
    QCOMPARE(error.description(), QString("Another Error"));
    QCOMPARE(error.line(), 2);
    QCOMPARE(error.column(), 33);

    QCOMPARE(error2.url(), QUrl("http://www.qt-project.org/main.qml"));
    QCOMPARE(error2.description(), QString("An Error"));
    QCOMPARE(error2.line(), 92);
    QCOMPARE(error2.column(), 13);

    QCOMPARE(error3.url(), QUrl("http://www.qt-project.org/main.qml"));
    QCOMPARE(error3.description(), QString("An Error"));
    QCOMPARE(error3.line(), 92);
    QCOMPARE(error3.column(), 13);

}

bool QDeclarativeImportsPrivate::importExtension(const QString &absoluteFilePath, const QString &uri, 
                                                 QDeclarativeImportDatabase *database, 
                                                 QDeclarativeDirComponents* components, QList<QDeclarativeError> *errors)
{
    QFile file(absoluteFilePath);
    QString filecontent;
    if (!QDeclarative_isFileCaseCorrect(absoluteFilePath)) {
        if (errors) {
            QDeclarativeError error;
            error.setDescription(QDeclarativeImportDatabase::tr("cannot load module \"%1\": File name case mismatch for \"%2\"").arg(uri).arg(absoluteFilePath));
            errors->prepend(error);
        }
        return false;
    } else if (file.open(QFile::ReadOnly)) {
        filecontent = QString::fromUtf8(file.readAll());
        if (qmlImportTrace())
            qDebug().nospace() << "QDeclarativeImports(" << qPrintable(base.toString()) << "::importExtension: "
                               << "loaded " << absoluteFilePath;
    } else {
        if (errors) {
            QDeclarativeError error;
            error.setDescription(QDeclarativeImportDatabase::tr("module \"%1\" definition \"%2\" not readable").arg(uri).arg(absoluteFilePath));
            errors->prepend(error);
        }
        return false;
    }
    QDir dir = QFileInfo(file).dir();
    QUrl url = QUrl::fromLocalFile(absoluteFilePath);

    QDeclarativeDirParser qmldirParser;
    qmldirParser.setSource(filecontent);
    qmldirParser.setUrl(url);

    // propagate any errors reported by the parser back up to the typeloader.
    if (qmldirParser.parse()) {
        if (errors) {
            for (int i = 0; i < qmldirParser.errors().size(); ++i) {
                errors->prepend(qmldirParser.errors().at(i));
            }
        }
        return false;
    }

    if (! qmlDirFilesForWhichPluginsHaveBeenLoaded.contains(absoluteFilePath)) {
        qmlDirFilesForWhichPluginsHaveBeenLoaded.insert(absoluteFilePath);


        foreach (const QDeclarativeDirParser::Plugin &plugin, qmldirParser.plugins()) {

            QString resolvedFilePath = database->resolvePlugin(dir, plugin.path, plugin.name);
#if defined(QT_LIBINFIX) && defined(Q_OS_SYMBIAN)
            if (resolvedFilePath.isEmpty()) {
                // In case of libinfixed build, attempt to load libinfixed version, too.
                QString infixedPluginName = plugin.name + QLatin1String(QT_LIBINFIX);
                resolvedFilePath = database->resolvePlugin(dir, plugin.path, infixedPluginName);
            }
#endif
            if (!resolvedFilePath.isEmpty()) {
                if (!database->importPlugin(resolvedFilePath, uri, errors)) {
                    if (errors) {
                        // XXX TODO: should we leave the import plugin error alone?
                        // Here, we pop it off the top and coalesce it into this error's message.
                        // The reason is that the lower level may add url and line/column numbering information.
                        QDeclarativeError poppedError = errors->takeFirst();
                        QDeclarativeError error;
                        error.setDescription(QDeclarativeImportDatabase::tr("plugin cannot be loaded for module \"%1\": %2").arg(uri).arg(poppedError.description()));
                        error.setUrl(url);
                        errors->prepend(error);
                    }
                    return false;
                }
            } else {
                if (errors) {
                    QDeclarativeError error;
                    error.setDescription(QDeclarativeImportDatabase::tr("module \"%1\" plugin \"%2\" not found").arg(uri).arg(plugin.name));
                    error.setUrl(url);
                    errors->prepend(error);
                }
                return false;
            }
        }
    }

bool QDeclarativeDirParser::parse()
{
    if (_isParsed)
        return true;

    _isParsed = true;
    _errors.clear();
    _plugins.clear();
    _components.clear();

    if (_source.isEmpty() && !_filePathSouce.isEmpty()) {
        QFile file(_filePathSouce);
        if (!QDeclarative_isFileCaseCorrect(_filePathSouce)) {
            QDeclarativeError error;
            error.setDescription(QString::fromUtf8("cannot load module \"$$URI$$\": File name case mismatch for \"%1\"").arg(_filePathSouce));
            _errors.prepend(error);
            return false;
        } else if (file.open(QFile::ReadOnly)) {
            _source = QString::fromUtf8(file.readAll());
        } else {
            QDeclarativeError error;
            error.setDescription(QString::fromUtf8("module \"$$URI$$\" definition \"%1\" not readable").arg(_filePathSouce));
            _errors.prepend(error);
            return false;
        }
    }

    QTextStream stream(&_source);
    int lineNumber = 0;

    forever {
        ++lineNumber;

        const QString line = stream.readLine();
        if (line.isNull())
            break;

        QString sections[3];
        int sectionCount = 0;

        int index = 0;
        const int length = line.length();

        while (index != length) {
            const QChar ch = line.at(index);

            if (ch.isSpace()) {
                do { ++index; }
                while (index != length && line.at(index).isSpace());

            } else if (ch == QLatin1Char('#')) {
                // recognized a comment
                break;

            } else {
                const int start = index;

                do { ++index; }
                while (index != length && !line.at(index).isSpace());

                const QString lexeme = line.mid(start, index - start);

                if (sectionCount >= 3) {
                    reportError(lineNumber, start, QLatin1String("unexpected token"));

                } else {
                    sections[sectionCount++] = lexeme;
                }
            }
        }

        if (sectionCount == 0) {
            continue; // no sections, no party.

        } else if (sections[0] == QLatin1String("plugin")) {
            if (sectionCount < 2) {
                reportError(lineNumber, -1,
                            QString::fromUtf8("plugin directive requires 2 arguments, but %1 were provided").arg(sectionCount + 1));

                continue;
            }

            const Plugin entry(sections[1], sections[2]);

            _plugins.append(entry);

        } else if (sections[0] == QLatin1String("internal")) {
            if (sectionCount != 3) {
                reportError(lineNumber, -1,
                            QString::fromUtf8("internal types require 2 arguments, but %1 were provided").arg(sectionCount + 1));
                continue;
            }
            Component entry(sections[1], sections[2], -1, -1);
            entry.internal = true;
            _components.append(entry);
        } else if (sections[0] == QLatin1String("typeinfo")) {
            if (sectionCount != 2) {
                reportError(lineNumber, -1,
                            QString::fromUtf8("typeinfo requires 1 argument, but %1 were provided").arg(sectionCount - 1));
                continue;
//.........这里部分代码省略.........