qt-creator/src/plugins/languageclient/languageclienthoverhandler.cpp

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** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
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** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
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#include "languageclienthoverhandler.h"

#include "client.h"

#include <texteditor/textdocument.h>
#include <texteditor/texteditor.h>
#include <utils/mimetypes/mimedatabase.h>
#include <utils/qtcassert.h>
#include <utils/tooltip/tooltip.h>

using namespace LanguageServerProtocol;

namespace LanguageClient {

HoverHandler::HoverHandler(Client *client)
    : m_client(client)
{}

HoverHandler::~HoverHandler()
{
    abort();
}

void HoverHandler::abort()
{
    if (m_client && m_client->reachable() && m_currentRequest.has_value())
        m_client->cancelRequest(*m_currentRequest);
    m_currentRequest.reset();
    m_response = {};
}

void HoverHandler::setHelpItem(const LanguageServerProtocol::MessageId &msgId,
                               const Core::HelpItem &help)
{
    if (msgId == m_response.id()) {
        if (Utils::optional<Hover> result = m_response.result())
            setContent(result->content());
        m_response = {};
        setLastHelpItemIdentified(help);
        m_report(priority());
    }
}

void HoverHandler::identifyMatch(TextEditor::TextEditorWidget *editorWidget,
                                 int pos,
                                 TextEditor::BaseHoverHandler::ReportPriority report)
{
    if (m_currentRequest.has_value())
        abort();
    if (m_client.isNull() || !m_client->documentOpen(editorWidget->textDocument())
        || !m_client->reachable()) {
        report(Priority_None);
        return;
    }
    m_uri = DocumentUri::fromFilePath(editorWidget->textDocument()->filePath());
    m_response = {};
    QTextCursor tc = editorWidget->textCursor();
    tc.setPosition(pos);
    const QList<Diagnostic> &diagnostics = m_client->diagnosticsAt(m_uri, tc);
    if (!diagnostics.isEmpty()) {
        const QStringList messages = Utils::transform(diagnostics, &Diagnostic::message);
        setToolTip(messages.join('\n'));
        report(Priority_Diagnostic);
        return;
    }

    const Utils::optional<Utils::variant<bool, WorkDoneProgressOptions>> &provider
        = m_client->capabilities().hoverProvider();
    bool sendMessage = provider.has_value();
    if (sendMessage && Utils::holds_alternative<bool>(*provider))
        sendMessage = Utils::get<bool>(*provider);
    if (Utils::optional<bool> registered = m_client->dynamicCapabilities().isRegistered(
            HoverRequest::methodName)) {
        sendMessage = *registered;
        if (sendMessage) {
            const TextDocumentRegistrationOptions option(
                m_client->dynamicCapabilities().option(HoverRequest::methodName).toObject());
            if (option.isValid()) {
                sendMessage = option.filterApplies(editorWidget->textDocument()->filePath(),
                                                   Utils::mimeTypeForName(
                                                       editorWidget->textDocument()->mimeType()));
            }
        }
    }
    if (!sendMessage) {
        report(Priority_None);
        return;
    }

    m_report = report;
    QTextCursor cursor = editorWidget->textCursor();
    cursor.setPosition(pos);
    HoverRequest request((TextDocumentPositionParams(TextDocumentIdentifier(m_uri), Position(cursor))));
    m_currentRequest = request.id();
    request.setResponseCallback(
        [this](const HoverRequest::Response &response) { handleResponse(response); });
    m_client->sendContent(request);
}

void HoverHandler::handleResponse(const HoverRequest::Response &response)
{
    m_currentRequest.reset();
    if (Utils::optional<HoverRequest::Response::Error> error = response.error()) {
        if (m_client)
            m_client->log(*error);
    }
    if (Utils::optional<Hover> result = response.result()) {
        if (m_helpItemProvider) {
            m_response = response;
            m_helpItemProvider(response, m_uri);
            return;
        }
        setContent(result->content());
    }
    m_report(priority());
}

static QString toolTipForMarkedStrings(const QList<MarkedString> &markedStrings)
{
    QString tooltip;
    for (const MarkedString &markedString : markedStrings) {
        if (!tooltip.isEmpty())
            tooltip += '\n';
        if (auto string = Utils::get_if<QString>(&markedString))
            tooltip += *string;
        else if (auto string = Utils::get_if<MarkedLanguageString>(&markedString))
            tooltip += string->value() + " [" + string->language() + ']';
    }
    return tooltip;
}

void HoverHandler::setContent(const HoverContent &hoverContent)
{
    if (auto markupContent = Utils::get_if<MarkupContent>(&hoverContent))
        setToolTip(markupContent->content(), markupContent->textFormat());
    else if (auto markedString = Utils::get_if<MarkedString>(&hoverContent))
        setToolTip(toolTipForMarkedStrings({*markedString}));
    else if (auto markedStrings = Utils::get_if<QList<MarkedString>>(&hoverContent))
        setToolTip(toolTipForMarkedStrings(*markedStrings));
}

} // namespace LanguageClient