Legacy programming languages such as FORTRAN 77 still play a vital role in many industrial applications. Maintaining and modernizing these languages is challenging, especially when migrating to newer standards such as Fortran 2008. This is exacerbated in the presence of legacy proprietary extensions on such legacy languages, because their semantics are often based on old context (limits of legacy language, domain logic,...). This paper presents an approach for automatically migrating FORTRAN 77 with a proprietary extension, named Esope, to Fortran 2008. We introduce a tool that converts Esope source code to Fortran 2008. While supporting readability of the generated code, we want to maintain the level of abstraction provided by Esope. Our method uses model-driven engineering techniques, with transformations to generate a target model from which we export easy-to-read Fortran 2008 source code. We discuss the advantages, limitations, and maintainability considerations of our approach and provide insights into its scalability and adaptability to evolving requirements.

翻译：FORTRAN 77等遗留编程语言仍在众多工业应用中发挥着关键作用。维护和现代化这些语言具有挑战性，特别是在向Fortran 2008等新标准迁移时。当此类遗留语言存在专有扩展时，问题会进一步加剧，因为这些扩展的语义通常基于旧有语境（遗留语言的限制、领域逻辑等）。本文提出了一种将带有专有扩展Esope的FORTRAN 77代码自动迁移至Fortran 2008的方法。我们开发了一款将Esope源代码转换为Fortran 2008的工具。在保证生成代码可读性的同时，我们致力于维持Esope所提供的抽象层次。该方法采用模型驱动工程技术，通过模型变换生成目标模型，并从中导出可读性强的Fortran 2008源代码。我们讨论了该方法的优势、局限性与可维护性考量，并就其扩展性及对需求演变的适应性提出了见解。