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//! [0]

QScriptEngine myEngine;

QScriptValue three = myEngine.evaluate("1 + 2");

//! [0]

//! [1]

QScriptValue fun = myEngine.evaluate("(function(a, b) { return a + b; })");

QScriptValueList args;

args << 1 << 2;

QScriptValue threeAgain = fun.call(QScriptValue(), args);

//! [1]

//! [2]

QString fileName = "helloworld.qs";

QFile scriptFile(fileName);

if (!scriptFile.open(QIODevice::ReadOnly))

    // handle error

QTextStream stream(&scriptFile);

QString contents = stream.readAll();

scriptFile.close();

myEngine.evaluate(contents, fileName);

//! [2]

//! [3]

myEngine.globalObject().setProperty("myNumber", 123);

...

QScriptValue myNumberPlusOne = myEngine.evaluate("myNumber + 1");

//! [3]

//! [4]

QScriptValue result = myEngine.evaluate(...);

if (myEngine.hasUncaughtException()) {

    int line = myEngine.uncaughtExceptionLineNumber();

    qDebug() << "uncaught exception at line" << line << ":" << result.toString();

}

//! [4]

//! [5]

QPushButton button;

QScriptValue scriptButton = myEngine.newQObject(&button);

myEngine.globalObject().setProperty("button", scriptButton);

myEngine.evaluate("button.checkable = true");

qDebug() << scriptButton.property("checkable").toBoolean();

scriptButton.property("show").call(); // call the show() slot

//! [5]

//! [6]

QScriptValue myAdd(QScriptContext *context, QScriptEngine *engine)

{

   QScriptValue a = context->argument(0);

   QScriptValue b = context->argument(1);

   return a.toNumber() + b.toNumber();

}

//! [6]

//! [7]

QScriptValue fun = myEngine.newFunction(myAdd);

myEngine.globalObject().setProperty("myAdd", fun);

//! [7]

//! [8]

QScriptValue result = myEngine.evaluate("myAdd(myNumber, 1)");

//! [8]

//! [9]

QScriptValue Foo(QScriptContext *context, QScriptEngine *engine)

{

    if (context->calledAsConstructor()) {

        // initialize the new object

        context->thisObject().setProperty("bar", ...);

        // ...

        // return a non-object value to indicate that the

        // thisObject() should be the result of the "new Foo()" expression

        return engine->undefinedValue();

    } else {

        // not called as "new Foo()", just "Foo()"

        // create our own object and return that one

        QScriptValue object = engine->newObject();

        object.setPrototype(context->callee().property("prototype"));

        object.setProperty("baz", ...);

        return object;

    }

}

...

QScriptValue fooProto = engine->newObject();

fooProto.setProperty("whatever", ...);

engine->globalObject().setProperty("Foo", engine->newFunction(Foo, fooProto));

//! [9]

//! [10]

class Bar { ... };

Q_DECLARE_METATYPE(Bar)

QScriptValue constructBar(QScriptContext *context, QScriptEngine *engine)

{

    Bar bar;

    // initialize from arguments in context, if desired

    ...

    return engine->toScriptValue(bar);

}

class BarPrototype : public QObject, public QScriptable

{

// provide the scriptable interface of this type using slots and properties

...

};

...

// create and register the Bar prototype and constructor in the engine

BarPrototype *barPrototypeObject = new BarPrototype(...);

QScriptValue barProto = engine->newQObject(barPrototypeObject);

engine->setDefaultPrototype(qMetaTypeId<Bar>, barProto);

QScriptValue barCtor = engine->newFunction(constructBar, barProto);

engine->globalObject().setProperty("Bar", barCtor);

//! [10]

//! [11]

static QScriptValue getSetFoo(QScriptContext *context, QScriptEngine *engine)

{

    QScriptValue callee = context->callee();

    if (context->argumentCount() == 1) // writing?

        callee.setProperty("value", context->argument(0));

    return callee.property("value");

}

....

QScriptValue object = engine.newObject();

object.setProperty("foo", engine.newFunction(getSetFoo),

    QScriptValue::PropertyGetter | QScriptValue::PropertySetter);

//! [11]

//! [12]

QScriptValue object = engine.newObject();

object.setProperty("foo", engine.newFunction(getFoo), QScriptValue::PropertyGetter);

object.setProperty("foo", engine.newFunction(setFoo), QScriptValue::PropertySetter);

//! [12]

//! [13]

Q_SCRIPT_DECLARE_QMETAOBJECT(QLineEdit, QWidget*)

...

QScriptValue lineEditClass = engine.scriptValueFromQMetaObject<QLineEdit>();

engine.globalObject().setProperty("QLineEdit", lineEditClass);

//! [13]

//! [14]

if (hello && world)

    print("hello world");

//! [14]

//! [15]

if (hello &&

//! [15]

//! [16]

0 = 0

//! [16]

//! [17]

./test.js

//! [17]

//! [18]

foo["bar"]

//! [18]

//! [19]

QScriptEngine engine;

QScriptContext *context = engine.pushContext();

context->activationObject().setProperty("myArg", 123);

engine.evaluate("var tmp = myArg + 42");

...

engine.popContext();

//! [19]

//! [20]

struct MyStruct {

    int x;

    int y;

};

//! [20]

//! [21]

Q_DECLARE_METATYPE(MyStruct)

//! [21]

//! [22]

QScriptValue toScriptValue(QScriptEngine *engine, const MyStruct &s)

{

  QScriptValue obj = engine->newObject();

  obj.setProperty("x", s.x);

  obj.setProperty("y", s.y);

  return obj;

}

void fromScriptValue(const QScriptValue &obj, MyStruct &s)

{

  s.x = obj.property("x").toInt32();

  s.y = obj.property("y").toInt32();

}

//! [22]

//! [23]

qScriptRegisterMetaType(engine, toScriptValue, fromScriptValue);

//! [23]

//! [24]

MyStruct s = qscriptvalue_cast<MyStruct>(context->argument(0));

...

MyStruct s2;

s2.x = s.x + 10;

s2.y = s.y + 20;

QScriptValue v = engine->toScriptValue(s2);

//! [24]

//! [25]

QScriptValue createMyStruct(QScriptContext *, QScriptEngine *engine)

{

    MyStruct s;

    s.x = 123;

    s.y = 456;

    return engine->toScriptValue(s);

}

...

QScriptValue ctor = engine.newFunction(createMyStruct);

engine.globalObject().setProperty("MyStruct", ctor);

//! [25]

//! [26]

Q_DECLARE_METATYPE(QVector<int>)

...

qScriptRegisterSequenceMetaType<QVector<int> >(engine);

...

QVector<int> v = qscriptvalue_cast<QVector<int> >(engine->evaluate("[5, 1, 3, 2]"));

qSort(v.begin(), v.end());

QScriptValue a = engine->toScriptValue(v);

qDebug() << a.toString(); // outputs "[1, 2, 3, 5]"

//! [26]

//! [27]

QScriptValue mySpecialQObjectConstructor(QScriptContext *context,

                                         QScriptEngine *engine)

{

    QObject *parent = context->argument(0).toQObject();

    QObject *object = new QObject(parent);

    return engine->newQObject(object, QScriptEngine::ScriptOwnership);

}

...

QScriptValue ctor = engine.newFunction(mySpecialQObjectConstructor);

QScriptValue metaObject = engine.newQMetaObject(&QObject::staticMetaObject, ctor);

engine.globalObject().setProperty("QObject", metaObject);

QScriptValue result = engine.evaluate("new QObject()");

//! [27]