plasma-framework/plasma/scripting/scriptengine.cpp
2013-01-30 13:43:33 +01:00

233 lines
6.1 KiB
C++

/*
* Copyright 2007 by Aaron Seigo <aseigo@kde.org>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU Library General Public License as
* published by the Free Software Foundation; either version 2, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details
*
* You should have received a copy of the GNU Library General Public
* License along with this program; if not, write to the
* Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*/
#include "scripting/scriptengine.h"
#include <kdebug.h>
#include <kservice.h>
#include <kservicetypetrader.h>
#include "abstractrunner.h"
#include "applet.h"
#include "dataengine.h"
#include "package.h"
#include "private/componentinstaller_p.h"
#include "scripting/appletscript.h"
#include "scripting/dataenginescript.h"
#include "scripting/runnerscript.h"
namespace Plasma
{
ScriptEngine::ScriptEngine(QObject *parent)
: QObject(parent),
d(0)
{
}
ScriptEngine::~ScriptEngine()
{
// delete d;
}
bool ScriptEngine::init()
{
return true;
}
Package ScriptEngine::package() const
{
return Package();
}
QString ScriptEngine::mainScript() const
{
return QString();
}
QStringList knownLanguages(ComponentTypes types)
{
QString constraintTemplate = "'%1' in [X-Plasma-ComponentTypes]";
QString constraint;
if (types & AppletComponent) {
// currently this if statement is not needed, but this future proofs
// the code against someone initializing constraint to something
// before we get here.
if (!constraint.isEmpty()) {
constraint.append(" or ");
}
constraint.append(constraintTemplate.arg("Applet"));
}
if (types & DataEngineComponent) {
if (!constraint.isEmpty()) {
constraint.append(" or ");
}
constraint.append(constraintTemplate.arg("DataEngine"));
}
if (types & RunnerComponent) {
if (!constraint.isEmpty()) {
constraint.append(" or ");
}
constraint.append(constraintTemplate.arg("Runner"));
}
KService::List offers = KServiceTypeTrader::self()->query("Plasma/ScriptEngine", constraint);
//kDebug() << "Applet::knownApplets constraint was '" << constraint
// << "' which got us " << offers.count() << " matches";
QStringList languages;
foreach (const KService::Ptr &service, offers) {
QString language = service->property("X-Plasma-API").toString();
if (!languages.contains(language)) {
languages.append(language);
}
}
return languages;
}
KService::List engineOffers(const QString &language, ComponentType type)
{
if (language.isEmpty()) {
return KService::List();
}
QRegExp re("[^a-zA-Z0-9\\-_]");
if (re.indexIn(language) != -1) {
#ifndef NDEBUG
kDebug() << "invalid language attempted:" << language;
#endif
return KService::List();
}
QString component;
switch (type) {
case AppletComponent:
component = "Applet";
break;
case DataEngineComponent:
component = "DataEngine";
break;
case RunnerComponent:
component = "Runner";
break;
default:
return KService::List();
break;
}
QString constraint = QString("[X-Plasma-API] == '%1' and "
"'%2' in [X-Plasma-ComponentTypes]").arg(language, component);
KService::List offers = KServiceTypeTrader::self()->query("Plasma/ScriptEngine", constraint);
/* kDebug() << "********************* loadingApplet with Plasma/ScriptEngine" << constraint
<< "resulting in" << offers.count() << "results";*/
if (offers.isEmpty()) {
#ifndef NDEBUG
kDebug() << "No offers for \"" << language << "\"";
#endif
}
return offers;
}
ScriptEngine *loadEngine(const QString &language, ComponentType type, QObject *parent)
{
KService::List offers = engineOffers(language, type);
QVariantList args;
QString error;
ScriptEngine *engine = 0;
foreach (const KService::Ptr &service, offers) {
switch (type) {
case AppletComponent:
engine = service->createInstance<Plasma::AppletScript>(parent, args, &error);
break;
case DataEngineComponent:
engine = service->createInstance<Plasma::DataEngineScript>(parent, args, &error);
break;
case RunnerComponent:
engine = service->createInstance<Plasma::RunnerScript>(parent, args, &error);
break;
default:
return 0;
break;
}
if (engine) {
return engine;
}
#ifndef NDEBUG
kDebug() << "Couldn't load script engine for language " << language
<< "! error reported: " << error;
#endif
}
// Try installing the engine. However, it's too late for this request.
ComponentInstaller::self()->installMissingComponent("scriptengine", language);
return 0;
}
AppletScript *loadScriptEngine(const QString &language, Applet *applet)
{
AppletScript *engine =
static_cast<AppletScript*>(loadEngine(language, AppletComponent, applet));
if (engine) {
engine->setApplet(applet);
}
return engine;
}
DataEngineScript *loadScriptEngine(const QString &language, DataEngine *dataEngine)
{
DataEngineScript *engine =
static_cast<DataEngineScript*>(loadEngine(language, DataEngineComponent, dataEngine));
if (engine) {
engine->setDataEngine(dataEngine);
}
return engine;
}
RunnerScript *loadScriptEngine(const QString &language, AbstractRunner *runner)
{
RunnerScript *engine = static_cast<RunnerScript*>(loadEngine(language, RunnerComponent, runner));
if (engine) {
engine->setRunner(runner);
}
return engine;
}
} // namespace Plasma
#include "moc_scriptengine.cpp"