These application generators supported COBOL inserts and overrides.
A [[Macro (computer science)|macro]] processor, such as the [[C preprocessor]], which replaces patterns in source code according to relatively simple rules, is a simple form of source-code generator.<ref>{{Cite web |last=LLC |first=Flatlogic |date=2022-11-15 |title=10+ Best code generation tools [Solutions Guide] |url=https://flatlogic.com/blog/10-best-low-code-generation-tools-solution-guide/ |access-date=2022-11-18 |website=Flatlogic Blog |language=en-US}}</ref> [[Source-to-source compiler|Source-to-source]] code generation tools also exist.<ref>Noaje, Gabriel, Christophe Jaillet, and Michaël Krajecki. "[https://www.researchgate.net/profile/Ponnuswamy_Sadayappan/publication/221302775_Automatic_C-to-CUDA_Code_Generation_for_Affine_Programs/links/09e4150e7f97085734000000/Automatic-C-to-CUDA-Code-Generation-for-Affine-Programs.pdf Source-to-source code translator: OpenMP C to CUDA]". High Performance Computing and Communications (HPCC), 2011 IEEE 13th International Conference on. IEEE, 2011.</ref><ref>Quinlan, Dan, and Chunhua Liao. "[https://www.researchgate.net/profile/Chunhua_Liao/publication/267861836_The_ROSE_Source-to-Source_Compiler_Infrastructure/links/5465a8120cf2f5eb17ff4238.pdf The ROSE source-to-source compiler infrastructure]". Cetus users and compiler infrastructure workshop, in conjunction with PACT. Vol. 2011. 2011.</ref>
