/*
  This file is part of the clazy static checker.

  Copyright (C) 2018 Sergio Martins <smartins@kde.org>

  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Library General Public
  License as published by the Free Software Foundation; either
  version 2 of the License, or (at your option) any later version.

  This library is distributed in the hope that it will be useful,
  but WITHOUT ANY WARRANTY; without even the implied warranty of
  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  Library General Public License for more details.

  You should have received a copy of the GNU Library General Public License
  along with this library; see the file COPYING.LIB.  If not, write to
  the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  Boston, MA 02110-1301, USA.
*/

#include "empty-qstringliteral.h"
#include "Utils.h"
#include "HierarchyUtils.h"
#include "QtUtils.h"
#include "TypeUtils.h"

#include <clang/AST/AST.h>

using namespace clang;
using namespace std;


EmptyQStringliteral::EmptyQStringliteral(const std::string &name, ClazyContext *context)
    : CheckBase(name, context)
{
}

void EmptyQStringliteral::VisitStmt(clang::Stmt *stmt)
{
    auto declstm = dyn_cast<DeclStmt>(stmt);
    if (!declstm || !declstm->isSingleDecl())
        return;

    auto vd = dyn_cast<VarDecl>(declstm->getSingleDecl());
    if (!vd || vd->getName() != "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;

    if (!getLocStart(stmt).isMacroID())
        return;

    emitWarning(stmt, "Use QString instead of an empty QStringLiteral");
}
