cpphs is a more liberal re-implementation of cpp, the C pre-processor, in Haskell. The C pre-processor is widely used in Haskell source code, but a true cpp is often unavailable on some systems (such as native Windows), and the common cpp provided by the gcc 3.x series has become more strictly tied to the C language, in subtle ways that are incompatible with Haskell's syntax. This includes problems with, for instance, string gaps, and prime characters in identifiers. This project provides a robust alternative to cpp that is more compatible with Haskell and can be distributed with compilers.
