src/dbus/qdbusxmlgenerator.cpp

   1 /****************************************************************************
   2 **
   3 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
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   6 ** This file is part of the QtDBus module of the Qt Toolkit.
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  22 ** Alternatively, this file may be used under the terms of the GNU General
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  41
  42 #include <QtCore/qmetaobject.h>
  43 #include <QtCore/qstringlist.h>
  44
  45 #include "qdbusinterface_p.h"   // for ANNOTATION_NO_WAIT
  46 #include "qdbusabstractadaptor_p.h" // for QCLASSINFO_DBUS_*
  47 #include "qdbusconnection_p.h"  // for the flags
  48 #include "qdbusmetatype_p.h"
  49 #include "qdbusmetatype.h"
  50 #include "qdbusutil_p.h"
  51
  52 #ifndef QT_NO_DBUS
  53
  54 QT_BEGIN_NAMESPACE
  55
  56 extern Q_DBUS_EXPORT QString qDBusGenerateMetaObjectXml(QString interface, const QMetaObject *mo,
  57                                                        const QMetaObject *base, int flags);
  58
  59 static inline QString typeNameToXml(const char *typeName)
  60 {
  61     // ### copied from qtextdocument.cpp
  62     // ### move this into QtCore at some point
  63     QString plain = QLatin1String(typeName);
  64     QString rich;
  65     rich.reserve(int(plain.length() * 1.1));
  66     for (int i = 0; i < plain.length(); ++i) {
  67         if (plain.at(i) == QLatin1Char('<'))
  68             rich += QLatin1String("&lt;");
  69         else if (plain.at(i) == QLatin1Char('>'))
  70             rich += QLatin1String("&gt;");
  71         else if (plain.at(i) == QLatin1Char('&'))
  72             rich += QLatin1String("&amp;");
  73         else
  74             rich += plain.at(i);
  75     }
  76     return rich;
  77 }
  78
  79 // implement the D-Bus org.freedesktop.DBus.Introspectable interface
  80 // we do that by analysing the metaObject of all the adaptor interfaces
  81
  82 static QString generateInterfaceXml(const QMetaObject *mo, int flags, int methodOffset, int propOffset)
  83 {
  84     QString retval;
  85
  86     // start with properties:
  87     if (flags & (QDBusConnection::ExportScriptableProperties |
  88                  QDBusConnection::ExportNonScriptableProperties)) {
  89         for (int i = propOffset; i < mo->propertyCount(); ++i) {
  90             static const char *accessvalues[] = {0, "read", "write", "readwrite"};
  91
  92             QMetaProperty mp = mo->property(i);
  93
  94             if (!((mp.isScriptable() && (flags & QDBusConnection::ExportScriptableProperties)) ||
  95                   (!mp.isScriptable() && (flags & QDBusConnection::ExportNonScriptableProperties))))
  96                 continue;
  97
  98             int access = 0;
  99             if (mp.isReadable())
 100                 access |= 1;
 101             if (mp.isWritable())
 102                 access |= 2;
 103
 104             int typeId = mp.userType();
 105             if (!typeId)
 106                 continue;
 107             const char *signature = QDBusMetaType::typeToSignature(typeId);
 108             if (!signature)
 109                 continue;
 110
 111             retval += QString::fromLatin1("    <property name=\"%1\" type=\"%2\" access=\"%3\"")
 112                       .arg(QLatin1String(mp.name()))
 113                       .arg(QLatin1String(signature))
 114                       .arg(QLatin1String(accessvalues[access]));
 115
 116             if (QDBusMetaType::signatureToType(signature) == QVariant::Invalid) {
 117                 const char *typeName = QMetaType::typeName(typeId);
 118                 retval += QString::fromLatin1(">\n      <annotation name=\"org.qtproject.QtDBus.QtTypeName\" value=\"%3\"/>\n    </property>\n")
 119                           .arg(typeNameToXml(typeName));
 120             } else {
 121                 retval += QLatin1String("/>\n");
 122             }
 123         }
 124     }
 125
 126     // now add methods:
 127     for (int i = methodOffset; i < mo->methodCount(); ++i) {
 128         QMetaMethod mm = mo->method(i);
 129
 130         bool isSignal;
 131         if (mm.methodType() == QMetaMethod::Signal)
 132             // adding a signal
 133             isSignal = true;
 134         else if (mm.access() == QMetaMethod::Public && (mm.methodType() == QMetaMethod::Slot || mm.methodType() == QMetaMethod::Method))
 135             isSignal = false;
 136         else
 137             continue;           // neither signal nor public slot
 138
 139         if (isSignal && !(flags & (QDBusConnection::ExportScriptableSignals |
 140                                    QDBusConnection::ExportNonScriptableSignals)))
 141             continue;           // we're not exporting any signals
 142         if (!isSignal && (!(flags & (QDBusConnection::ExportScriptableSlots | QDBusConnection::ExportNonScriptableSlots)) &&
 143                           !(flags & (QDBusConnection::ExportScriptableInvokables | QDBusConnection::ExportNonScriptableInvokables))))
 144             continue;           // we're not exporting any slots or invokables
 145
 146         QString xml = QString::fromLatin1("    <%1 name=\"%2\">\n")
 147                       .arg(isSignal ? QLatin1String("signal") : QLatin1String("method"))
 148                       .arg(QString::fromLatin1(mm.name()));
 149
 150         // check the return type first
 151         int typeId = mm.returnType();
 152         if (typeId != QMetaType::UnknownType && typeId != QMetaType::Void) {
 153             const char *typeName = QDBusMetaType::typeToSignature(typeId);
 154             if (typeName) {
 155                 xml += QString::fromLatin1("      <arg type=\"%1\" direction=\"out\"/>\n")
 156                        .arg(typeNameToXml(typeName));
 157
 158                 // do we need to describe this argument?
 159                 if (QDBusMetaType::signatureToType(typeName) == QVariant::Invalid)
 160                     xml += QString::fromLatin1("      <annotation name=\"org.qtproject.QtDBus.QtTypeName.Out0\" value=\"%1\"/>\n")
 161                         .arg(typeNameToXml(QMetaType::typeName(typeId)));
 162             } else
 163                 continue;
 164         }
 165         else if (typeId == QMetaType::UnknownType)
 166             continue;           // wasn't a valid type
 167
 168         QList<QByteArray> names = mm.parameterNames();
 169         QVector<int> types;
 170         int inputCount = qDBusParametersForMethod(mm, types);
 171         if (inputCount == -1)
 172             continue;           // invalid form
 173         if (isSignal && inputCount + 1 != types.count())
 174             continue;           // signal with output arguments?
 175         if (isSignal && types.at(inputCount) == QDBusMetaTypeId::message)
 176             continue;           // signal with QDBusMessage argument?
 177         if (isSignal && mm.attributes() & QMetaMethod::Cloned)
 178             continue;           // cloned signal?
 179
 180         int j;
 181         bool isScriptable = mm.attributes() & QMetaMethod::Scriptable;
 182         for (j = 1; j < types.count(); ++j) {
 183             // input parameter for a slot or output for a signal
 184             if (types.at(j) == QDBusMetaTypeId::message) {
 185                 isScriptable = true;
 186                 continue;
 187             }
 188
 189             QString name;
 190             if (!names.at(j - 1).isEmpty())
 191                 name = QString::fromLatin1("name=\"%1\" ").arg(QLatin1String(names.at(j - 1)));
 192
 193             bool isOutput = isSignal || j > inputCount;
 194
 195             const char *signature = QDBusMetaType::typeToSignature(types.at(j));
 196             xml += QString::fromLatin1("      <arg %1type=\"%2\" direction=\"%3\"/>\n")
 197                    .arg(name)
 198                    .arg(QLatin1String(signature))
 199                    .arg(isOutput ? QLatin1String("out") : QLatin1String("in"));
 200
 201             // do we need to describe this argument?
 202             if (QDBusMetaType::signatureToType(signature) == QVariant::Invalid) {
 203                 const char *typeName = QMetaType::typeName(types.at(j));
 204                 xml += QString::fromLatin1("      <annotation name=\"org.qtproject.QtDBus.QtTypeName.%1%2\" value=\"%3\"/>\n")
 205                        .arg(isOutput ? QLatin1String("Out") : QLatin1String("In"))
 206                        .arg(isOutput && !isSignal ? j - inputCount : j - 1)
 207                        .arg(typeNameToXml(typeName));
 208             }
 209         }
 210
 211         int wantedMask;
 212         if (isScriptable)
 213             wantedMask = isSignal ? QDBusConnection::ExportScriptableSignals
 214                                   : QDBusConnection::ExportScriptableSlots;
 215         else
 216             wantedMask = isSignal ? QDBusConnection::ExportNonScriptableSignals
 217                                   : QDBusConnection::ExportNonScriptableSlots;
 218         if ((flags & wantedMask) != wantedMask)
 219             continue;
 220
 221         if (qDBusCheckAsyncTag(mm.tag()))
 222             // add the no-reply annotation
 223             xml += QLatin1String("      <annotation name=\"" ANNOTATION_NO_WAIT "\""
 224                                  " value=\"true\"/>\n");
 225
 226         retval += xml;
 227         retval += QString::fromLatin1("    </%1>\n")
 228                   .arg(isSignal ? QLatin1String("signal") : QLatin1String("method"));
 229     }
 230
 231     return retval;
 232 }
 233
 234 QString qDBusGenerateMetaObjectXml(QString interface, const QMetaObject *mo,
 235                                    const QMetaObject *base, int flags)
 236 {
 237     if (interface.isEmpty())
 238         // generate the interface name from the meta object
 239         interface = qDBusInterfaceFromMetaObject(mo);
 240
 241     QString xml;
 242     int idx = mo->indexOfClassInfo(QCLASSINFO_DBUS_INTROSPECTION);
 243     if (idx >= mo->classInfoOffset())
 244         return QString::fromUtf8(mo->classInfo(idx).value());
 245     else
 246         xml = generateInterfaceXml(mo, flags, base->methodCount(), base->propertyCount());
 247
 248     if (xml.isEmpty())
 249         return QString();       // don't add an empty interface
 250     return QString::fromLatin1("  <interface name=\"%1\">\n%2  </interface>\n")
 251         .arg(interface, xml);
 252 }
 253 #if 0
 254 QString qDBusGenerateMetaObjectXml(QString interface, const QMetaObject *mo, const QMetaObject *base,
 255                                    int flags)
 256 {
 257     if (interface.isEmpty()) {
 258         // generate the interface name from the meta object
 259         int idx = mo->indexOfClassInfo(QCLASSINFO_DBUS_INTERFACE);
 260         if (idx >= mo->classInfoOffset()) {
 261             interface = QLatin1String(mo->classInfo(idx).value());
 262         } else {
 263             interface = QLatin1String(mo->className());
 264             interface.replace(QLatin1String("::"), QLatin1String("."));
 265
 266             if (interface.startsWith(QLatin1String("QDBus"))) {
 267                 interface.prepend(QLatin1String("org.qtproject.QtDBus."));
 268             } else if (interface.startsWith(QLatin1Char('Q')) &&
 269                        interface.length() >= 2 && interface.at(1).isUpper()) {
 270                 // assume it's Qt
 271                 interface.prepend(QLatin1String("org.qtproject.Qt."));
 272             } else if (!QCoreApplication::instance()||
 273                        QCoreApplication::instance()->applicationName().isEmpty()) {
 274                 interface.prepend(QLatin1String("local."));
 275             } else {
 276                 interface.prepend(QLatin1Char('.')).prepend(QCoreApplication::instance()->applicationName());
 277                 QStringList domainName =
 278                     QCoreApplication::instance()->organizationDomain().split(QLatin1Char('.'),
 279                                                                              QString::SkipEmptyParts);
 280                 if (domainName.isEmpty())
 281                     interface.prepend(QLatin1String("local."));
 282                 else
 283                     for (int i = 0; i < domainName.count(); ++i)
 284                         interface.prepend(QLatin1Char('.')).prepend(domainName.at(i));
 285             }
 286         }
 287     }
 288
 289     QString xml;
 290     int idx = mo->indexOfClassInfo(QCLASSINFO_DBUS_INTROSPECTION);
 291     if (idx >= mo->classInfoOffset())
 292         return QString::fromUtf8(mo->classInfo(idx).value());
 293     else
 294         xml = generateInterfaceXml(mo, flags, base->methodCount(), base->propertyCount());
 295
 296     if (xml.isEmpty())
 297         return QString();       // don't add an empty interface
 298     return QString::fromLatin1("  <interface name=\"%1\">\n%2  </interface>\n")
 299         .arg(interface, xml);
 300 }
 301
 302 #endif
 303
 304 QT_END_NAMESPACE
 305
 306 #endif // QT_NO_DBUS