1 files changed, 81 insertions, 0 deletions
diff --git a/src/qmlls/qqmlhover.cpp b/src/qmlls/qqmlhover.cpp
new file mode 100644
index 0000000000..4f604558a3
--- /dev/null
+++ b/src/qmlls/qqmlhover.cpp
@@ -0,0 +1,81 @@
+// Copyright (C) 2024 The Qt Company Ltd.
+// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
+
+#include <qqmlhover_p.h>
+
+QT_BEGIN_NAMESPACE
+
+Q_LOGGING_CATEGORY(hoverLog, "qt.languageserver.hover")
+
+QQmlHover::QQmlHover(QmlLsp::QQmlCodeModel *codeModel)
+    : QQmlBaseModule(codeModel)
+{
+}
+
+QString QQmlHover::name() const
+{
+    return u"QQmlHover"_s;
+}
+
+void QQmlHover::registerHandlers(QLanguageServer *, QLanguageServerProtocol *protocol)
+{
+    protocol->registerHoverRequestHandler(getRequestHandler());
+}
+
+void QQmlHover::setupCapabilities(
+        const QLspSpecification::InitializeParams &,
+        QLspSpecification::InitializeResult &serverCapabilities)
+{
+    serverCapabilities.capabilities.hoverProvider = true;
+}
+
+void QQmlHover::process(RequestPointerArgument request)
+{
+    using namespace QQmlJS::Dom;
+    QLspSpecification::Hover result;
+    ResponseScopeGuard guard(result, request->m_response);
+
+    if (!request) {
+        qCWarning(hoverLog) << "No hover information is available!";
+        return;
+    }
+
+    const auto textDocument = request->m_parameters.textDocument;
+    const auto [hoveredLine, hoveredCharacter] = request->m_parameters.position;
+    qCDebug(hoverLog) << QStringLiteral("Hovered (line, col): (%1,%2)").arg(hoveredLine).arg(hoveredCharacter);
+
+    const auto doc = m_codeModel->openDocumentByUrl(
+                QQmlLSUtils::lspUriToQmlUrl(textDocument.uri));
+
+    DomItem file = doc.snapshot.doc.fileObject(GoTo::MostLikely);
+    if (!file) {
+        guard.setError(QQmlLSUtilsErrorMessage{
+                0, u"Could not find the file %1"_s.arg(doc.snapshot.doc.canonicalFilePath()) });
+        return;
+    }
+
+    // TODO: Fetch the actual documentation or other possible infos to be shown when hovered.
+    // Early return if hovered element is not identifier kind (for example, don't perform anything on paranthesis)
+
+    const auto documentation = QQmlLSUtils::getDocumentationFromLocation(
+            file, { hoveredLine + 1, hoveredCharacter + 1 });
+    if (documentation.isEmpty()) {
+        qCDebug(hoverLog)
+                << QStringLiteral(
+                           "No documentation hints found for the item at (line, col): (%1,%2)")
+                           .arg(hoveredLine)
+                           .arg(hoveredCharacter);
+        return;
+    }
+
+    QLspSpecification::MarkupContent content;
+
+    // TODO: This should eventually be a Markdown kind.
+    // We will do post-formatting what we fetch from documentation.
+    content.kind = QLspSpecification::MarkupKind::PlainText;
+    content.value = documentation;
+
+    result.contents = content;
+}
+
+QT_END_NAMESPACE