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  1. Qt
  2. QTBUG-67240

QQmlExpression::hasError() always returns false

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    Description

      QQmlExpression::hasError() always returns false even though given expression is not valid.
      Also, QQmlExpression::error() is not set with invalid expression.
      This makes errors in expression undetectable.

      Here's example program:

      #include <QtCore/QDebug>
#include <QtCore/QCoreApplication>
#include <QtQml/QQmlEngine>
#include <QtQml/QQmlComponent>
#include <QtQml/QQmlExpression>

auto main(int argc, char **argv) -> int
{
    QCoreApplication app{argc, argv};
    QQmlEngine engine;
    QObject scope;
    QQmlExpression expr{engine.rootContext(), &scope, "{"};
    expr.evaluate();
    qDebug() << "error?" << expr.hasError();
    return 0;
}

      I expect the output be "error? true", but here's the actual output:

      <Unknown File>: SyntaxError: Expected token `}'
error? false

      Although the SyntaxError is printed by Qt itself, hasError() still returns false.

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            shausman Simon Hausmann
            xylosper Byoung-young Lee
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              Created:
              Updated:
              Resolved:

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