Nowadays, you code your grammar directly in the source language, and your parser library generates a parser at compile time as part of the normal build cycle.

Nowadays, you code your grammar directly in the source language, and your parser library generates a parser at compile time as part of the normal build cycle. Of course this works best in a language that supports operator overloading and compile-time operations. In the old days, in C++, this would have been done with template metaprogramming, which cost various annoyances. Now no such workarounds are needed.