qmllint: Warn about deprecated functions

Now qmllint will also warn when functions have a Deprecated annotation which previously only applied to properties and elements.

Task-number: QTBUG-84895
Fixes: QTBUG-79857
Change-Id: Ie1436822dc06bfd1ee4305a8468900409c3f8b0a
Reviewed-by: Fabian Kosmale <fabian.kosmale@qt.io>

1 files changed, 21 insertions, 0 deletions

diff --git a/tools/qmllint/checkidentifiers.cpp b/tools/qmllint/checkidentifiers.cpp
index e2ac8981f5..1e889926a1 100644
--- a/tools/qmllint/checkidentifiers.cpp
+++ b/tools/qmllint/checkidentifiers.cpp
@@ -299,6 +299,27 @@ void CheckIdentifiers::operator()(
             auto qmlScope = QQmlJSScope::findCurrentQMLScope(currentScope);
             if (qmlScope->hasMethod(memberAccessBase.m_name)) {
                 // a property of a JavaScript function, or a method
+                auto methods = qmlScope->methods(memberAccessBase.m_name);
+                const QQmlJSMetaMethod &method = methods.constFirst();
+                const auto &annotations = method.annotations();
+                auto deprecationAnn = std::find_if(annotations.constBegin(), annotations.constEnd(), [](const QQmlJSAnnotation& annotation) {
+                    return annotation.isDeprecation();
+                });
+
+                // Once we encountered one possible method that is not deprecated,
+                // we can assume that the one beyond that is not what was being referenced
+                if (deprecationAnn == annotations.constEnd())
+                    continue;
+
+                QQQmlJSDeprecation deprecation = deprecationAnn->deprecation();
+
+                QString message = QStringLiteral("Method \"%1(%2)\" is deprecated")
+                        .arg(memberAccessBase.m_name, method.parameterNames().join(QStringLiteral(", ")));
+
+                if (!deprecation.reason.isEmpty())
+                    message.append(QStringLiteral(" (Reason: %1)").arg(deprecation.reason));
+
+                m_logger->log(message, Log_Deprecation, memberAccessBase.m_location);
                 continue;
             }