Implement new plugin mechanism

moc can now embed meta information about the plugin
inside the plugin itself. This information can
be queried by Qt without having to load the plugin.

Source compatibility with the old plugin loading
mechanism is still there, but will be removed before
Qt 5.0.

Change-Id: I03e4196ddfed07d0fe94acca40d5de8a6ce7f920
Reviewed-by: João Abecasis <joao.abecasis@nokia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

1 files changed, 52 insertions, 0 deletions

diff --git a/src/tools/moc/moc.cpp b/src/tools/moc/moc.cpp
index 5c9e1ee838..97316eedde 100644
--- a/src/tools/moc/moc.cpp
+++ b/src/tools/moc/moc.cpp
@@ -44,6 +44,9 @@
 #include "qdatetime.h"
 #include "utils.h"
 #include "outputrevision.h"
+#include <QtCore/qfile.h>
+#include <QtCore/qfileinfo.h>
+#include <QtCore/qdir.h>
 
 // for normalizeTypeInternal
 #include <private/qmetaobject_moc_p.h>
@@ -673,6 +676,9 @@ void Moc::parse()
                 case Q_PROPERTY_TOKEN:
                     parseProperty(&def);
                     break;
+                case Q_PLUGIN_METADATA_TOKEN:
+                    parsePluginData(&def);
+                    break;
                 case Q_ENUMS_TOKEN:
                     parseEnumOrFlag(&def, false);
                     break;
@@ -813,6 +819,8 @@ void Moc::generate(FILE *out)
 
     if (mustIncludeQMetaTypeH)
         fprintf(out, "#include <QtCore/qmetatype.h>\n");
+    if (mustIncludeQPluginH)
+        fprintf(out, "#include <QtCore/qplugin.h>\n");
 
     fprintf(out, "#if !defined(Q_MOC_OUTPUT_REVISION)\n"
             "#error \"The header file '%s' doesn't include <QObject>.\"\n", (const char *)fn);
@@ -1080,6 +1088,50 @@ void Moc::parseProperty(ClassDef *def)
     def->propertyList += propDef;
 }
 
+void Moc::parsePluginData(ClassDef *def)
+{
+    next(LPAREN);
+    QByteArray metaData;
+    while (test(IDENTIFIER)) {
+        QByteArray l = lexem();
+        if (l == "IID") {
+            next(STRING_LITERAL);
+            def->pluginData.iid = unquotedLexem();
+        } else if (l == "FILE") {
+            next(STRING_LITERAL);
+            QByteArray metaDataFile = unquotedLexem();
+            QFileInfo fi(QFileInfo(QString::fromLocal8Bit(currentFilenames.top())).dir(), QString::fromLocal8Bit(metaDataFile));
+            if (!fi.exists()) {
+                QByteArray msg;
+                msg += "Plugin Metadata file ";
+                msg += lexem();
+                msg += " does not exist. Declaration will be ignored";
+                warning(msg.constData());
+                return;
+            }
+            QFile file(fi.canonicalFilePath());
+            file.open(QFile::ReadOnly);
+            metaData = file.readAll();
+        }
+    }
+
+    if (!metaData.isEmpty()) {
+        def->pluginData.metaData = QJsonDocument::fromJson(metaData);
+        if (!def->pluginData.metaData.isObject()) {
+            QByteArray msg;
+            msg += "Plugin Metadata file ";
+            msg += lexem();
+            msg += " does not contain a valid JSON object. Declaration will be ignored";
+            warning(msg.constData());
+            def->pluginData.iid = QByteArray();
+            return;
+        }
+    }
+
+    mustIncludeQPluginH = true;
+    next(RPAREN);
+}
+
 void Moc::parsePrivateProperty(ClassDef *def)
 {
     next(LPAREN);