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/****************************************************************************
**
** Copyright (C) 2019 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of Qt Creator.
**
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3 as published by the Free Software
** Foundation with exceptions as appearing in the file LICENSE.GPL3-EXCEPT
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-3.0.html.
**
****************************************************************************/
#include "languageclientfunctionhint.h"
#include "client.h"
#include <languageserverprotocol/languagefeatures.h>
#include <texteditor/codeassist/assistinterface.h>
#include <texteditor/codeassist/functionhintproposal.h>
#include <texteditor/codeassist/iassistprocessor.h>
#include <texteditor/codeassist/ifunctionhintproposalmodel.h>
using namespace TextEditor;
using namespace LanguageServerProtocol;
namespace LanguageClient {
class FunctionHintProposalModel : public IFunctionHintProposalModel
{
public:
explicit FunctionHintProposalModel(SignatureHelp signature)
: m_sigis(signature)
{}
void reset() override {}
int size() const override
{ return m_sigis.signatures().size(); }
QString text(int index) const override;
int activeArgument(const QString &/*prefix*/) const override
{ return m_sigis.activeParameter().value_or(0); }
private:
LanguageServerProtocol::SignatureHelp m_sigis;
};
QString FunctionHintProposalModel::text(int index) const
{
if (index < 0 || m_sigis.signatures().size() >= index)
return {};
return m_sigis.signatures().at(index).label();
}
class FunctionHintProcessor : public IAssistProcessor
{
public:
explicit FunctionHintProcessor(Client *client) : m_client(client) {}
IAssistProposal *perform(const AssistInterface *interface) override;
bool running() override { return m_currentRequest.has_value(); }
bool needsRestart() const override { return true; }
void cancel() override;
private:
void handleSignatureResponse(const SignatureHelpRequest::Response &response);
QPointer<Client> m_client;
Utils::optional<MessageId> m_currentRequest;
int m_pos = -1;
};
IAssistProposal *FunctionHintProcessor::perform(const AssistInterface *interface)
{
QTC_ASSERT(m_client, return nullptr);
m_pos = interface->position();
QTextCursor cursor(interface->textDocument());
cursor.setPosition(m_pos);
auto uri = DocumentUri::fromFilePath(interface->filePath());
SignatureHelpRequest request((TextDocumentPositionParams(TextDocumentIdentifier(uri), Position(cursor))));
request.setResponseCallback([this](auto response) { this->handleSignatureResponse(response); });
m_client->sendContent(request);
m_currentRequest = request.id();
return nullptr;
}
void FunctionHintProcessor::cancel()
{
if (running()) {
m_client->cancelRequest(m_currentRequest.value());
m_client->removeAssistProcessor(this);
m_currentRequest.reset();
}
}
void FunctionHintProcessor::handleSignatureResponse(const SignatureHelpRequest::Response &response)
{
m_currentRequest.reset();
if (auto error = response.error())
m_client->log(error.value());
m_client->removeAssistProcessor(this);
auto result = response.result().value_or(LanguageClientValue<SignatureHelp>());
if (result.isNull()) {
setAsyncProposalAvailable(nullptr);
return;
}
const SignatureHelp &signatureHelp = result.value();
if (signatureHelp.signatures().isEmpty()) {
setAsyncProposalAvailable(nullptr);
} else {
FunctionHintProposalModelPtr model(new FunctionHintProposalModel(signatureHelp));
setAsyncProposalAvailable(new FunctionHintProposal(m_pos, model));
}
}
FunctionHintAssistProvider::FunctionHintAssistProvider(Client *client)
: CompletionAssistProvider(client)
, m_client(client)
{}
TextEditor::IAssistProcessor *FunctionHintAssistProvider::createProcessor() const
{
return new FunctionHintProcessor(m_client);
}
IAssistProvider::RunType FunctionHintAssistProvider::runType() const
{
return Asynchronous;
}
int FunctionHintAssistProvider::activationCharSequenceLength() const
{
return m_activationCharSequenceLength;
}
bool FunctionHintAssistProvider::isActivationCharSequence(
const QString &sequence) const
{
return Utils::anyOf(m_triggerChars,
[sequence](const QString &trigger) { return trigger.endsWith(sequence); });
}
bool FunctionHintAssistProvider::isContinuationChar(const QChar &/*c*/) const
{
return true;
}
void FunctionHintAssistProvider::setTriggerCharacters(
const Utils::optional<QList<QString>> &triggerChars)
{
m_triggerChars = triggerChars.value_or(QList<QString>());
for (const QString &trigger : qAsConst(m_triggerChars)) {
if (trigger.length() > m_activationCharSequenceLength)
m_activationCharSequenceLength = trigger.length();
}
}
} // namespace LanguageClient
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