C++ QScriptContext::callee方法代码示例

QVariant TestClass::extension(Extension extension,
                              const QVariant &argument)
{
    m_lastExtensionType = extension;
    m_lastExtensionArgument = argument;
    if (extension == Callable) {
        Q_ASSERT(m_callableMode != NotCallable);
        QScriptContext *ctx = qvariant_cast<QScriptContext*>(argument);
        if (m_callableMode == CallableReturnsSum) {
            qsreal sum = 0;
            for (int i = 0; i < ctx->argumentCount(); ++i)
                sum += ctx->argument(i).toNumber();
            QScriptValueIterator it(ctx->callee());
            while (it.hasNext()) {
                it.next();
                sum += it.value().toNumber();
            }
            return sum;
        } else if (m_callableMode == CallableReturnsArgument) {
            return qVariantFromValue(ctx->argument(0));
        } else if (m_callableMode == CallableReturnsInvalidVariant) {
            return QVariant();
        } else if (m_callableMode == CallableReturnsGlobalObject) {
            return qVariantFromValue(engine()->globalObject());
        } else if (m_callableMode == CallableReturnsThisObject) {
            return qVariantFromValue(ctx->thisObject());
        } else if (m_callableMode == CallableReturnsCallee) {
            return qVariantFromValue(ctx->callee());
        } else if (m_callableMode == CallableReturnsArgumentsObject) {
            return qVariantFromValue(ctx->argumentsObject());
        } else if (m_callableMode == CallableInitializesThisObject) {
            engine()->newQObject(ctx->thisObject(), engine());
            return QVariant();
        }
    } else if (extension == HasInstance) {
        Q_ASSERT(m_hasInstance);
        QScriptValueList args = qvariant_cast<QScriptValueList>(argument);
        QScriptValue obj = args.at(0);
        QScriptValue value = args.at(1);
        return value.property("foo").equals(obj.property("foo"));
    }
    return QVariant();
}

void ScriptDebuggerPrivate::positionChange(qint64 scriptId,
                                           int lineNumber, int /*columnNumber*/)
{
    ScriptInfo *info = 0;
    bool enterInteractiveMode = false;

    if (m_bpManager->hasBreakpoints()) {
        // check if we hit a breakpoint
        info = m_scripts.value(scriptId);
        QScriptContext *ctx = engine()->currentContext();
        QScriptContextInfo ctxInfo(ctx);
        QScriptValue callee = ctx->callee();

        // try fileName:lineNumber
        int bpid = m_bpManager->findBreakpoint(info->fileName(), lineNumber);
        if ((bpid != -1) && m_bpManager->isBreakpointEnabled(bpid)) {
            message(QString::fromLatin1("Breakpoint %0 at %1:%2")
                    .arg(bpid + 1).arg(info->fileName()).arg(lineNumber));
            if (m_bpManager->isBreakpointSingleShot(bpid))
                m_bpManager->removeBreakpoint(bpid);
        }
        if (bpid == -1) {
            // try function
            bpid = m_bpManager->findBreakpoint(callee);
            if ((bpid != -1) && m_bpManager->isBreakpointEnabled(bpid)) {
                message(QString::fromLatin1("Breakpoint %0, %1()")
                        .arg(bpid + 1).arg(ctxInfo.functionName()));
                if (m_bpManager->isBreakpointSingleShot(bpid))
                    m_bpManager->removeBreakpoint(bpid);
            }
        }
        if ((bpid == -1) && !ctxInfo.functionName().isEmpty()) {
            // try functionName:fileName
            bpid = m_bpManager->findBreakpoint(ctxInfo.functionName(), ctxInfo.fileName());
            if ((bpid != -1) && m_bpManager->isBreakpointEnabled(bpid)) {
                message(QString::fromLatin1("Breakpoint %0, %1():%2").arg(bpid + 1)
                        .arg(ctxInfo.functionName()).arg(ctxInfo.fileName()));
                if (m_bpManager->isBreakpointSingleShot(bpid))
                    m_bpManager->removeBreakpoint(bpid);
            }
        }

        enterInteractiveMode = (bpid != -1);
    }

    switch (mode()) {
    case Run:
        break;

    case StepInto:
        enterInteractiveMode = true;
        break;

    case StepOver:
        enterInteractiveMode = enterInteractiveMode || (m_stepDepth <= 0);
        break;
    }

    if (enterInteractiveMode) {
        if (!info)
            info = m_scripts.value(scriptId);
        Q_ASSERT(info);        
        message(QString::fromLatin1("%0\t%1").arg(lineNumber).arg(info->lineText(lineNumber)));
        interactive();
    }
}

//.........这里部分代码省略.........
    case QScriptDebuggerCommand::GetActivationObject: {
        QScriptContext *ctx = backend->context(command.contextIndex());
        if (ctx)
            response.setResult(ctx->activationObject());
        else
            response.setError(QScriptDebuggerResponse::InvalidContextIndex);
    }   break;

    case QScriptDebuggerCommand::GetScopeChain: {
        QScriptContext *ctx = backend->context(command.contextIndex());
        if (ctx) {
            QScriptDebuggerValueList dest;
            QScriptValueList src = ctx->scopeChain();
            for (int i = 0; i < src.size(); ++i)
                dest.append(src.at(i));
            response.setResult(dest);
        } else {
            response.setError(QScriptDebuggerResponse::InvalidContextIndex);
        }
    }   break;

    case QScriptDebuggerCommand::ContextsCheckpoint: {
        response.setResult(QVariant::fromValue(backend->contextsCheckpoint()));
    }   break;

    case QScriptDebuggerCommand::GetPropertyExpressionValue: {
        QScriptContext *ctx = backend->context(command.contextIndex());
        int lineNumber = command.lineNumber();
        QVariant attr = command.attribute(QScriptDebuggerCommand::UserAttribute);
        QStringList path = attr.toStringList();
        if (!ctx || path.isEmpty())
            break;
        QScriptContextInfo ctxInfo(ctx);
        if (ctx->callee().isValid()
            && ((lineNumber < ctxInfo.functionStartLineNumber())
                || (lineNumber > ctxInfo.functionEndLineNumber()))) {
            break;
        }
        QScriptValueList objects;
        int pathIndex = 0;
        if (path.at(0) == QLatin1String("this")) {
            objects.append(ctx->thisObject());
            ++pathIndex;
        } else {
            objects << ctx->scopeChain();
        }
        for (int i = 0; i < objects.size(); ++i) {
            QScriptValue val = objects.at(i);
            for (int j = pathIndex; val.isValid() && (j < path.size()); ++j) {
                val = val.property(path.at(j));
            }
            if (val.isValid()) {
                bool hadException = (ctx->state() == QScriptContext::ExceptionState);
                QString str = val.toString();
                if (!hadException && backend->engine()->hasUncaughtException())
                    backend->engine()->clearExceptions();
                response.setResult(str);
                break;
            }
        }
    }   break;

    case QScriptDebuggerCommand::GetCompletions: {
        QScriptContext *ctx = backend->context(command.contextIndex());
        QVariant attr = command.attribute(QScriptDebuggerCommand::UserAttribute);
        QStringList path = attr.toStringList();

void tst_QScriptContext::pushAndPopContext()
{
    QScriptEngine eng;
    QScriptContext *topLevel = eng.currentContext();
    QCOMPARE(topLevel->engine(), &eng);

    QScriptContext *ctx = eng.pushContext();
    QVERIFY(ctx != 0);
    QCOMPARE(ctx->parentContext(), topLevel);
    QCOMPARE(eng.currentContext(), ctx);
    QCOMPARE(ctx->engine(), &eng);
    QCOMPARE(ctx->state(), QScriptContext::NormalState);
    QCOMPARE(ctx->isCalledAsConstructor(), false);
    QCOMPARE(ctx->argumentCount(), 0);
    QCOMPARE(ctx->argument(0).isUndefined(), true);
    QVERIFY(!ctx->argument(-1).isValid());
    QCOMPARE(ctx->argumentsObject().isObject(), true);
    QCOMPARE(ctx->activationObject().isObject(), true);
    QCOMPARE(ctx->callee().isValid(), false);
    QCOMPARE(ctx->thisObject().strictlyEquals(eng.globalObject()), true);
    QCOMPARE(ctx->scopeChain().size(), 2);
    QVERIFY(ctx->scopeChain().at(0).equals(ctx->activationObject()));
    QVERIFY(ctx->scopeChain().at(1).equals(eng.globalObject()));

    QScriptContext *ctx2 = eng.pushContext();
    QCOMPARE(ctx2->parentContext(), ctx);
    QCOMPARE(eng.currentContext(), ctx2);

    eng.popContext();
    QCOMPARE(eng.currentContext(), ctx);
    eng.popContext();
    QCOMPARE(eng.currentContext(), topLevel);

    // popping the top-level context is not allowed
    QTest::ignoreMessage(QtWarningMsg, "QScriptEngine::popContext() doesn't match with pushContext()");
    eng.popContext();
    QCOMPARE(eng.currentContext(), topLevel);

    {
        QScriptContext *ctx3 = eng.pushContext();
        ctx3->activationObject().setProperty("foo", QScriptValue(&eng, 123));
        QVERIFY(eng.evaluate("foo").strictlyEquals(QScriptValue(&eng, 123)));
        eng.evaluate("var bar = 'ciao'");
        QVERIFY(ctx3->activationObject().property("bar", QScriptValue::ResolveLocal).strictlyEquals(QScriptValue(&eng, "ciao")));
        eng.popContext();
    }

    {
        QScriptContext *ctx4 = eng.pushContext();
        QScriptValue obj = eng.newObject();
        obj.setProperty("prop", QScriptValue(&eng, 456));
        ctx4->setThisObject(obj);
        QScriptValue ret = eng.evaluate("var tmp = this.prop; tmp + 1");
        QCOMPARE(eng.currentContext(), ctx4);
        QVERIFY(ret.strictlyEquals(QScriptValue(&eng, 457)));
        eng.popContext();
    }

    // throwing an exception
    {
        QScriptContext *ctx5 = eng.pushContext();
        QScriptValue ret = eng.evaluate("throw new Error('oops')");
        QVERIFY(ret.isError());
        QVERIFY(eng.hasUncaughtException());
        QCOMPARE(eng.currentContext(), ctx5);
        eng.popContext();
    }
}