tst_qqmlexpression.cpp

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// Copyright (C) 2016 The Qt Company Ltd.

// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

#include <qtest.h>

#include <QtQml/qqmlcomponent.h>

#include <QtQml/qqmlcontext.h>

#include <QtQml/qqmlengine.h>

#include <QtQml/qqmlexpression.h>

#include <QtQml/qqmlfile.h>

#include <QtQml/qqmlscriptstring.h>

#include <QtQuickTestUtils/private/qmlutils_p.h>

class tst_qqmlexpression : public QQmlDataTest

    Q_OBJECT

public:

    tst_qqmlexpression() : QQmlDataTest(QT_QMLTEST_DATADIR) {}

private slots:

    void scriptString();

    void syntaxError();

    void exception();

    void expressionFromDataComponent();

    void emptyScriptString();

};

class TestObject : public QObject

    Q_OBJECT

    Q_PROPERTY(QQmlScriptString scriptString READ scriptString WRITE setScriptString)

    Q_PROPERTY(QQmlScriptString scriptStringError READ scriptStringError WRITE setScriptStringError)

public:

    TestObject(QObject *parent = nullptr) : QObject(parent) {}

    QQmlScriptString scriptString() const { return m_scriptString; }

    void setScriptString(QQmlScriptString scriptString) { m_scriptString = scriptString; }

    QQmlScriptString scriptStringError() const { return m_scriptStringError; }

    void setScriptStringError(QQmlScriptString scriptString) { m_scriptStringError = scriptString; }

private:

    QQmlScriptString m_scriptString;

    QQmlScriptString m_scriptStringError;

};

QML_DECLARE_TYPE(TestObject)

void tst_qqmlexpression::scriptString()

    qmlRegisterType<TestObject>("Test", 1, 0, "TestObject");

    QQmlEngine engine;

    QQmlComponent c(&engine, testFileUrl("scriptString.qml"));

    std::unique_ptr<QObject> root(c.create());

    TestObject *testObj = qobject_cast<TestObject*>(root.get());

    QVERIFY(testObj != nullptr);

    QQmlScriptString script = testObj->scriptString();

    QVERIFY(!script.isEmpty());

    QQmlExpression expression(script);

    QVariant value = expression.evaluate();

    QCOMPARE(value.toInt(), 15);

    QQmlScriptString scriptError = testObj->scriptStringError();

    QVERIFY(!scriptError.isEmpty());

    //verify that the expression has the correct error location information

    QQmlExpression expressionError(scriptError);

    QVariant valueError = expressionError.evaluate();

    QVERIFY(!valueError.isValid());

    QVERIFY(expressionError.hasError());

    QQmlError error = expressionError.error();

    QCOMPARE(error.url(), c.url());

    QCOMPARE(error.line(), 8);

// QTBUG-21310 - crash test

void tst_qqmlexpression::syntaxError()

    QQmlEngine engine;

    QQmlExpression expression(engine.rootContext(), nullptr, "asd asd");

    bool isUndefined = false;

    QVariant v = expression.evaluate(&isUndefined);

    QCOMPARE(v, QVariant());

    QVERIFY(expression.hasError());

    QCOMPARE(expression.error().description(), "SyntaxError: Expected token `;'");

    QVERIFY(isUndefined);

void tst_qqmlexpression::exception()

    QQmlEngine engine;

    QQmlExpression expression(engine.rootContext(), nullptr, "abc=123");

    QVariant v = expression.evaluate();

    QCOMPARE(v, QVariant());

    QVERIFY(expression.hasError());

void tst_qqmlexpression::expressionFromDataComponent()

    qmlRegisterType<TestObject>("Test", 1, 0, "TestObject");

    QQmlEngine engine;

    QQmlComponent c(&engine);

    const QString fn(QLatin1String("expressionFromDataComponent.qml"));

    QUrl url = testFileUrl(fn);

    QString path = testFile(fn);

        QFile f(path);

        QVERIFY(f.open(QIODevice::ReadOnly));

        c.setData(f.readAll(), url);

    QScopedPointer<TestObject> object;

    object.reset(qobject_cast<TestObject*>(c.create()));

    Q_ASSERT(!object.isNull());

    QQmlExpression expression(object->scriptString());

    QVariant result = expression.evaluate();

    QCOMPARE(result.typeId(), QMetaType::QString);

    QCOMPARE(result.toString(), QStringLiteral("success"));

void tst_qqmlexpression::emptyScriptString()

    QQmlEngine engine;

    QQmlContext *context = engine.rootContext();

    QVERIFY(context);

    QVERIFY(context->isValid());

    QQmlScriptString empty;

    QVERIFY(empty.isEmpty());

    QQmlExpression expression(empty, context, this);

    QCOMPARE(expression.context(), context);

    QCOMPARE(expression.scopeObject(), this);

    QCOMPARE(expression.expression(), QString());

    const QVariant result = expression.evaluate();

    QVERIFY(!result.isValid());

    QQmlComponent c(&engine, testFileUrl("scriptString.qml"));

    std::unique_ptr<QObject> root { c.create() };

    TestObject *testObj = qobject_cast<TestObject*>(root.get());

    QVERIFY(testObj != nullptr);

    QQmlScriptString script = testObj->scriptString();

    QVERIFY(!script.isEmpty());

    // verify that comparing against an empty script string does not crash

    QVERIFY(script != empty);

QTEST_MAIN(tst_qqmlexpression)

#include "tst_qqmlexpression.moc"