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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only WITH Qt-GPL-exception-1.0
#include "cppquickfixassistant.h"
#include "cppeditorwidget.h"
#include "cppmodelmanager.h"
#include "cppquickfix.h"
#include "cpprefactoringchanges.h"
#include <texteditor/codeassist/genericproposal.h>
#include <texteditor/codeassist/iassistprocessor.h>
#include <texteditor/textdocument.h>
#include <cplusplus/ASTPath.h>
#include <utils/algorithm.h>
#include <utils/qtcassert.h>
using namespace CPlusPlus;
using namespace TextEditor;
namespace CppEditor::Internal {
// CppQuickFixAssistProvider
class CppQuickFixAssistProvider final : public IAssistProvider
{
public:
class CppQuickFixAssistProcessor final : public IAssistProcessor
{
IAssistProposal *perform() final
{
return GenericProposal::createProposal(interface(), quickFixOperations(interface()));
}
};
TextEditor::IAssistProcessor *createProcessor(const TextEditor::AssistInterface *) const final
{
return new CppQuickFixAssistProcessor;
}
};
IAssistProvider &cppQuickFixAssistProvider()
{
static CppQuickFixAssistProvider theCppQuickFixAssistProvider;
return theCppQuickFixAssistProvider;
}
// CppQuickFixAssistInterface
CppQuickFixInterface::CppQuickFixInterface(CppEditorWidget *editor, AssistReason reason)
: AssistInterface(editor->textCursor(), editor->textDocument()->filePath(), reason)
, m_editor(editor)
, m_semanticInfo(editor->semanticInfo())
, m_snapshot(CppModelManager::snapshot())
, m_currentFile(CppRefactoringChanges::file(editor, m_semanticInfo.doc))
, m_context(m_semanticInfo.doc, m_snapshot)
{
QTC_CHECK(m_semanticInfo.doc);
QTC_CHECK(m_semanticInfo.doc->translationUnit());
QTC_CHECK(m_semanticInfo.doc->translationUnit()->ast());
ASTPath astPath(m_semanticInfo.doc);
m_path = astPath(adjustedCursor());
}
const QList<AST *> &CppQuickFixInterface::path() const
{
return m_path;
}
Snapshot CppQuickFixInterface::snapshot() const
{
return m_snapshot;
}
SemanticInfo CppQuickFixInterface::semanticInfo() const
{
return m_semanticInfo;
}
const LookupContext &CppQuickFixInterface::context() const
{
return m_context;
}
CppEditorWidget *CppQuickFixInterface::editor() const
{
return m_editor;
}
CppRefactoringFilePtr CppQuickFixInterface::currentFile() const
{
return m_currentFile;
}
bool CppQuickFixInterface::isCursorOn(unsigned tokenIndex) const
{
return currentFile()->isCursorOn(tokenIndex);
}
bool CppQuickFixInterface::isCursorOn(const AST *ast) const
{
return currentFile()->isCursorOn(ast);
}
// Some users like to select identifiers and expect the quickfix to apply to the selection.
// However, as the cursor position is at the end of the selection, it can happen that
// the quickfix is applied to the following token instead; see e.g. QTCREATORBUG-27886.
// We try to detect this condition: If there is a selection *and* this selection
// corresponds to a C++ token, we move the cursor to that token's position.
QTextCursor CppQuickFixInterface::adjustedCursor()
{
QTextCursor cursor = this->cursor();
if (!cursor.hasSelection())
return cursor;
const TranslationUnit * const tu = m_semanticInfo.doc->translationUnit();
const int selStart = cursor.selectionStart();
const int selEnd = cursor.selectionEnd();
const QTextDocument * const doc = m_editor->textDocument()->document();
// Binary search for matching token.
for (int l = 0, u = tu->tokenCount() - 1; l <= u; ) {
const int i = (l + u) / 2;
const int tokenPos = tu->getTokenPositionInDocument(i, doc);
if (selStart < tokenPos) {
u = i - 1;
continue;
}
if (selStart > tokenPos) {
l = i + 1;
continue;
}
// Selection does not end at token end.
if (tokenPos + tu->tokenAt(i).utf16chars() != selEnd)
break;
cursor.setPosition(selStart);
// Try not to have the cursor "at the edge", in order to prevent potential ambiguities.
if (selEnd - selStart > 1)
cursor.setPosition(cursor.position() + 1);
return cursor;
}
return cursor;
}
QuickFixOperations quickFixOperations(const TextEditor::AssistInterface *interface)
{
const auto cppInterface = dynamic_cast<const CppQuickFixInterface *>(interface);
if (!cppInterface)
return {};
QuickFixOperations quickFixes;
for (CppQuickFixFactory *factory : CppQuickFixFactory::cppQuickFixFactories())
factory->match(*cppInterface, quickFixes);
return quickFixes;
}
} // namespace CppEditor::Internal
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