cue2pb is a tool and library for converting from a Cuesheet to a purpose built protobuf: cuesheet.proto.
The primary intent of this code is to provide the cuesheet.proto, and a way to get to and from said protobuf.
That said, the cuesheet parser and unparser are written in C++, and are available either as a C++ library in parser.h and unparser.h; or if working in another language or interactively, the cue2pb executable can be invoked as a subprocess and its output captured.
Here's some examples of using cue2pb interactively:
Convert a cuesheet to a binary protobuf.
$ cue2pb foo.cue
Convert a cuesheet to a textual protobuf.
$ cue2pb --textformat foo.cue
Convert a binary protobuf to a cuesheet.
$ cue2pb --proto_to_cue foo.cuepb
Convert a textual protobuf to a cuesheet.
$ cue2pb --textformat --proto_to_cue foo.textproto
If you wish to work with Cuesheet protos from another language, feel free to send pull requests adding Bazel build rules to generate the protobuf for additional languages as desired.