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// Copyright (C) 2022 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0+ OR GPL-3.0 WITH Qt-GPL-exception-1.0
#include "clangdswitchdecldef.h"
#include "clangdast.h"
#include "clangdclient.h"
#include <cppeditor/cppeditorwidget.h>
#include <languageclient/documentsymbolcache.h>
#include <languageserverprotocol/lsptypes.h>
#include <texteditor/textdocument.h>
#include <utils/qtcassert.h>
#include <QApplication>
#include <QTextCursor>
#include <optional>
using namespace CppEditor;
using namespace LanguageClient;
using namespace LanguageServerProtocol;
using namespace TextEditor;
using namespace Utils;
namespace ClangCodeModel::Internal {
class ClangdSwitchDeclDef::Private
{
public:
Private(ClangdSwitchDeclDef * q, ClangdClient *client, TextDocument *doc,
const QTextCursor &cursor, CppEditorWidget *editorWidget, const LinkHandler &callback)
: q(q), client(client), document(doc), uri(DocumentUri::fromFilePath(doc->filePath())),
cursor(cursor), editorWidget(editorWidget), callback(callback)
{}
std::optional<ClangdAstNode> getFunctionNode() const;
QTextCursor cursorForFunctionName(const ClangdAstNode &functionNode) const;
void handleDeclDefSwitchReplies();
ClangdSwitchDeclDef * const q;
ClangdClient * const client;
const QPointer<TextDocument> document;
const DocumentUri uri;
const QTextCursor cursor;
const QPointer<CppEditorWidget> editorWidget;
const LinkHandler callback;
std::optional<ClangdAstNode> ast;
std::optional<DocumentSymbolsResult> docSymbols;
bool done = false;
};
ClangdSwitchDeclDef::ClangdSwitchDeclDef(ClangdClient *client, TextDocument *doc,
const QTextCursor &cursor, CppEditorWidget *editorWidget, const LinkHandler &callback)
: QObject(client), d(new Private(this, client, doc, cursor, editorWidget, callback))
{
// Abort if the user does something else with the document in the meantime.
connect(doc, &TextDocument::contentsChanged, this, &ClangdSwitchDeclDef::emitDone,
Qt::QueuedConnection);
if (editorWidget) {
connect(editorWidget, &CppEditorWidget::cursorPositionChanged,
this, &ClangdSwitchDeclDef::emitDone, Qt::QueuedConnection);
}
connect(qApp, &QApplication::focusChanged,
this, &ClangdSwitchDeclDef::emitDone, Qt::QueuedConnection);
connect(client->documentSymbolCache(), &DocumentSymbolCache::gotSymbols, this,
[this](const DocumentUri &uri, const DocumentSymbolsResult &symbols) {
if (uri != d->uri)
return;
d->docSymbols = symbols;
if (d->ast)
d->handleDeclDefSwitchReplies();
});
// Retrieve AST and document symbols.
const auto astHandler = [this, self = QPointer(this)]
(const ClangdAstNode &ast, const MessageId &) {
qCDebug(clangdLog) << "received ast for decl/def switch";
if (!self)
return;
if (!d->document) {
emitDone();
return;
}
if (!ast.isValid()) {
emitDone();
return;
}
d->ast = ast;
if (d->docSymbols)
d->handleDeclDefSwitchReplies();
};
client->getAndHandleAst(doc, astHandler, ClangdClient::AstCallbackMode::SyncIfPossible, {});
client->documentSymbolCache()->requestSymbols(d->uri, Schedule::Now);
}
ClangdSwitchDeclDef::~ClangdSwitchDeclDef()
{
delete d;
}
void ClangdSwitchDeclDef::emitDone()
{
if (d->done)
return;
d->done = true;
emit done();
}
std::optional<ClangdAstNode> ClangdSwitchDeclDef::Private::getFunctionNode() const
{
QTC_ASSERT(ast, return {});
const ClangdAstPath path = getAstPath(*ast, Range(cursor));
for (auto it = path.rbegin(); it != path.rend(); ++it) {
if (it->role() == "declaration"
&& (it->kind() == "CXXMethod" || it->kind() == "CXXConversion"
|| it->kind() == "CXXConstructor" || it->kind() == "CXXDestructor"
|| it->kind() == "Function")) {
return *it;
}
}
return {};
}
QTextCursor ClangdSwitchDeclDef::Private::cursorForFunctionName(const ClangdAstNode &functionNode) const
{
QTC_ASSERT(docSymbols, return {});
const auto symbolList = std::get_if<QList<DocumentSymbol>>(&*docSymbols);
if (!symbolList)
return {};
const Range &astRange = functionNode.range();
QList symbolsToCheck = *symbolList;
while (!symbolsToCheck.isEmpty()) {
const DocumentSymbol symbol = symbolsToCheck.takeFirst();
if (symbol.range() == astRange)
return symbol.selectionRange().start().toTextCursor(document->document());
if (symbol.range().contains(astRange))
symbolsToCheck << symbol.children().value_or(QList<DocumentSymbol>());
}
return {};
}
void ClangdSwitchDeclDef::Private::handleDeclDefSwitchReplies()
{
if (!document) {
q->emitDone();
return;
}
// Find the function declaration or definition associated with the cursor.
// For instance, the cursor could be somwehere inside a function body or
// on a function return type, or ...
if (clangdLogAst().isDebugEnabled())
ast->print(0);
const std::optional<ClangdAstNode> functionNode = getFunctionNode();
if (!functionNode) {
q->emitDone();
return;
}
// Unfortunately, the AST does not contain the location of the actual function name symbol,
// so we have to look for it in the document symbols.
const QTextCursor funcNameCursor = cursorForFunctionName(*functionNode);
if (!funcNameCursor.isNull()) {
client->followSymbol(document.data(), funcNameCursor, editorWidget, callback,
true, false);
}
q->emitDone();
}
} // namespace ClangCodeModel::Internal
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