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/****************************************************************************
**
** Copyright (C) 2016 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.
**
****************************************************************************/
#pragma once
#include "clangrefactoringbackend_global.h"
#include <clang/AST/AST.h>
#include <clang/AST/ASTContext.h>
#include <clang/AST/RecursiveASTVisitor.h>
#include <clang/Index/USRGeneration.h>
#include <llvm/ADT/SmallVector.h>
#include <vector>
namespace ClangBackEnd {
class FindNamedDeclarationASTVisitor : public clang::RecursiveASTVisitor<FindNamedDeclarationASTVisitor>
{
public:
explicit FindNamedDeclarationASTVisitor(const clang::SourceManager &sourceManager,
const clang::SourceLocation cursorSourceLocation)
: m_sourceManager(sourceManager),
m_cursorSourceLocation(cursorSourceLocation)
{
}
bool shouldVisitTemplateInstantiations() const
{
return true;
}
bool VisitNamedDecl(const clang::NamedDecl *declaration)
{
auto name = declaration->getNameAsString();
setResultIfCursorIsInBetween(declaration,
declaration->getLocation(),
declaration->getNameAsString().length());
return true;
}
bool VisitDeclRefExpr(const clang::DeclRefExpr *expression)
{
if (!iterateNestedNameSpecifierLocation(expression->getQualifierLoc()))
return false;
const auto *declaration = expression->getFoundDecl();
return setResultIfCursorIsInBetween(declaration,
expression->getLocation(),
declaration->getNameAsString().length());
}
bool VisitMemberExpr(const clang::MemberExpr *expression)
{
const auto *declaration = expression->getFoundDecl().getDecl();
return setResultIfCursorIsInBetween(declaration,
expression->getMemberLoc(),
declaration->getNameAsString().length());
}
std::vector<const clang::NamedDecl*> takeNamedDecl()
{
return std::move(m_namedDeclarations);
}
private:
bool canSetResult(const clang::NamedDecl *declaration,
clang::SourceLocation location)
{
return declaration
&& !setResultIfCursorIsInBetween(declaration,
location,
declaration->getNameAsString().length());
}
bool iterateNestedNameSpecifierLocation(clang::NestedNameSpecifierLoc nameLocation) {
while (nameLocation) {
const auto *declaration = nameLocation.getNestedNameSpecifier()->getAsNamespace();
if (canSetResult(declaration, nameLocation.getLocalBeginLoc()))
return false;
nameLocation = nameLocation.getPrefix();
}
return true;
}
bool isValidLocationWithCursorInside(clang::SourceLocation startLocation,
clang::SourceLocation endLocation)
{
return startLocation.isValid()
&& startLocation.isFileID()
&& endLocation.isValid()
&& endLocation.isFileID()
&& isCursorLocationBetween(startLocation, endLocation);
}
bool setResultIfCursorIsInBetween(const clang::NamedDecl *declaration,
clang::SourceLocation startLocation,
clang::SourceLocation endLocation)
{
bool isValid = isValidLocationWithCursorInside(startLocation, endLocation);
if (isValid)
m_namedDeclarations.push_back(declaration);
return !isValid;
}
bool setResultIfCursorIsInBetween(const clang::NamedDecl *declaration,
clang::SourceLocation location,
uint offset) {
return offset == 0
|| setResultIfCursorIsInBetween(declaration, location, location.getLocWithOffset(offset - 1));
}
bool isCursorLocationBetween(const clang::SourceLocation startLocation,
const clang::SourceLocation endLocation)
{
return m_cursorSourceLocation == startLocation
|| m_cursorSourceLocation == endLocation
|| (m_sourceManager.isBeforeInTranslationUnit(startLocation, m_cursorSourceLocation)
&& m_sourceManager.isBeforeInTranslationUnit(m_cursorSourceLocation, endLocation));
}
std::vector<const clang::NamedDecl*> m_namedDeclarations;
const clang::SourceManager &m_sourceManager;
const clang::SourceLocation m_cursorSourceLocation;
};
inline
std::vector<const clang::NamedDecl *> namedDeclarationsAt(const clang::ASTContext &Context,
const clang::SourceLocation cursorSourceLocation)
{
const auto &sourceManager = Context.getSourceManager();
const auto currentFile = sourceManager.getFilename(cursorSourceLocation);
FindNamedDeclarationASTVisitor visitor(sourceManager, cursorSourceLocation);
auto declarations = Context.getTranslationUnitDecl()->decls();
for (auto ¤tDeclation : declarations) {
const auto &fileLocation = currentDeclation->getBeginLoc();
const auto &fileName = sourceManager.getFilename(fileLocation);
if (fileName == currentFile) {
visitor.TraverseDecl(currentDeclation);
const auto &namedDeclarations = visitor.takeNamedDecl();
if (!namedDeclarations.empty())
return namedDeclarations;
}
}
return std::vector<const clang::NamedDecl *>();
}
inline
USRName USROfDeclaration(const clang::Decl *declaration)
{
USRName buffer;
if (declaration == nullptr || clang::index::generateUSRForDecl(declaration, buffer))
return buffer;
return buffer;
}
} // namespace ClangBackend
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