File indexing completed on 2024-05-12 05:40:55

 /*
     SPDX-FileCopyrightText: 2018 Sergio Martins <smartins@kde.org>
 
     SPDX-License-Identifier: LGPL-2.0-or-later
 */
 
 #include "empty-qstringliteral.h"
 #include "ClazyContext.h"
 #include "HierarchyUtils.h"
 #include "PreProcessorVisitor.h"
 #include "QtUtils.h"
 
 #include <clang/AST/Decl.h>
 #include <clang/AST/Expr.h>
 #include <clang/AST/Stmt.h>
 #include <clang/Basic/LLVM.h>
 #include <clang/Basic/SourceLocation.h>
 #include <llvm/ADT/StringRef.h>
 #include <llvm/Support/Casting.h>
 
 using namespace clang;
 
 EmptyQStringliteral::EmptyQStringliteral(const std::string &name, ClazyContext *context)
     : CheckBase(name, context)
 {
     context->enablePreprocessorVisitor();
 }
 
 void EmptyQStringliteral::VisitStmt(clang::Stmt *stmt)
 {
     if (!stmt->getBeginLoc().isMacroID()) {
         return;
     }
 
     const std::string filepath = static_cast<std::string>(sm().getFilename(sm().getExpansionLoc(stmt->getBeginLoc())));
     if (clazy::contains(filepath, ".rcc/qmlcache/")) {
         return; // This is an autogenerated file
     }
     if (auto splitted = clazy::splitString(filepath, '/'); !splitted.empty()) {
         if (std::string filename = splitted[splitted.size() - 1]; clazy::startsWith(filename, "ui_") && clazy::endsWith(filename, ".h")) {
             return; // Also ignore all ui files
         }
     }
 
     if (m_context->preprocessorVisitor && m_context->preprocessorVisitor->qtVersion() >= 60000) { // The AST looks very different in Qt6
         handleQt6StringLiteral(stmt);
     } else {
         handleQt5StringLiteral(stmt);
     }
 }
 
 void EmptyQStringliteral::handleQt6StringLiteral(clang::Stmt *stmt)
 {
     if (auto c = dyn_cast<CallExpr>(stmt)) {
         if (clazy::qualifiedMethodName(c->getDirectCallee()) == "QtPrivate::qMakeStringPrivate") {
             if (auto lt = clazy::getFirstChildOfType<StringLiteral>(c); lt && lt->getByteLength() == 0) {
                 emitWarning(stmt, "Use QLatin1String(\"\") or QString() instead of an empty QStringLiteral");
             }
         }
     }
 }
 
 void EmptyQStringliteral::handleQt5StringLiteral(clang::Stmt *stmt)
 {
     auto *declstm = dyn_cast<DeclStmt>(stmt);
     if (!declstm || !declstm->isSingleDecl()) {
         return;
     }
 
     auto *vd = dyn_cast<VarDecl>(declstm->getSingleDecl());
     if (!vd || clazy::name(vd) != "qstring_literal") {
         return;
     }
 
     Expr *expr = vd->getInit();
     auto *initListExpr = expr ? dyn_cast<InitListExpr>(expr) : nullptr;
     if (!initListExpr || initListExpr->getNumInits() != 2) {
         return;
     }
 
     Expr *init = initListExpr->getInit(1);
     auto *literal = init ? dyn_cast<StringLiteral>(init) : nullptr;
     if (!literal || literal->getByteLength() != 0) {
         return;
     }
 
     emitWarning(stmt, "Use QLatin1String(\"\") or QString() instead of an empty QStringLiteral");
 }