A simple header-only library for parsing s-expressions to C++ structures

Only catch2 if you intend to build tests. You need a C++20 capable compiler; sexplib uses concepts.

Copy include/sexplib.hh to your project, or use the meson install target (will also build, but not install, tests unless configured otherwise).

The main functionality is the sexp::parse function, which takes a string containing your s-expression (a single top-level s-expression) and is generic over types implementing the sexp::Deserializable concept.

parse will build the Deserializable datatype you call it with from your s-expression, and return the result. Precisely how this datatype is built depends on your implementation of the functions required by Deserializable; this is the "coolness" of sexplib, that it makes it easy to parse s-expressions into specialized structures.

sexplib provides two example implementations: sexp::Sexp is the recommended default, and uses std::optional with a head atom and a tail list of Sexp to model the s-expression. If enabled by including #define SEXPLIB_USE_VECTORSEXP, the sexp::VectorSexp type is an alternative, based around std::variant. See sexplib.hh or the files in test/ for examples of use.

• Implement find_all for VectorSexp
• Add more example types satisfying Deserializable
• Add more utility functions to s-expression types and iterators