I think the variable names still need some improvements. For example, for this method, my version would be something like this

```
    bool isASwap(ASTContext& context,
        const Stmt& assignsAToTmp,
        const BinaryOperator* assignsBToA,
        const BinaryOperator* assignsTmpToB,
        SourceLocation* sourceLocation)
    {
        if (assignsBToA == nullptr || assignsTmpToB == nullptr
            || assignsBToA->getOpcode() != BO_Assign
            || assignsTmpToB->getOpcode() != BO_Assign)
        {
            return false;
        }

        const BinaryOperator* const binOpAssignsAToTmp = dyn_cast<BinaryOperator>(&assignsAToTmp);
        const DeclStmt* const declStmtAssignsAToTmp = dyn_cast<DeclStmt>(&assignsAToTmp);
        const Expr& tmpExprOnRHS = *ignoreCastExpr(*assignsTmpToB->getRHS());
        const Expr* aExprOnRHS = nullptr;

        if (binOpAssignsAToTmp != nullptr && binOpAssignsAToTmp->getOpcode() == BO_Assign)
        {
            // tmp = a;
            const Expr* tmpExprOnLHS = ignoreCastExpr(*binOpAssignsAToTmp->getLHS());
            if (areSameExpr(context, *tmpExprOnLHS, tmpExprOnRHS) == false)
            {
                return false;
            }
            aExprOnRHS = ignoreCastExpr(*binOpAssignsAToTmp->getRHS());
            *sourceLocation = tmpExprOnLHS->getLocStart();
        }
        else if (declStmtAssignsAToTmp != nullptr && declStmtAssignsAToTmp->isSingleDecl())
        {
            // int tmp = a;
            // int tmp(a);
            const VarDecl* decl = dyn_cast<VarDecl>(declStmtAssignsAToTmp->getSingleDecl());

            if (decl == nullptr)
            {
                return false;
            }

            const Expr* initializer = decl->getAnyInitializer();
            if (initializer == nullptr)
            {
                return false;
            }
            aExprOnRHS = ignoreCastExpr(*initializer);
            const DeclRefExpr* tmpDeclRef = dyn_cast<DeclRefExpr>(&tmpExprOnRHS);

            if (tmpDeclRef == nullptr || tmpDeclRef->getDecl() != decl)
            {
                return false;
            }
            *sourceLocation = tmpDeclRef->getLocation();
        }
        else
        {
            return false;
        }
        const Expr& aExprOnLHS = *ignoreCastExpr(*assignsBToA->getLHS());
        const Expr& bExprOnRHS = *ignoreCastExpr(*assignsBToA->getRHS());
        const Expr& bExprOnLHS = *ignoreCastExpr(*assignsTmpToB->getLHS());

        return areSameExpr(context, *aExprOnRHS, aExprOnLHS) && areSameExpr(context, bExprOnRHS, bExprOnLHS);
    }
```