Parsepples, a Parslet-like parser for C++

So yeah, while digging down on parsers I think writing something cool would be a good thing to make some experience, it's been some time since I last wrote something in C++, so here we go.

As the title says, Parsepples is inspired by Parslet, a really really cool parsing tool for Ruby.

This stuff will be using C++0x, because I didn't try to use it yet, so this is a good chance to learn some new stuff :)

Design choices

In C++ memory management becomes a problem, so I choose to leave all the memory management for parsing results and whatever to the parser Context. This Context has a cache that keeps track of all the Result objects, in this way you can parse and use the objects without worrying of what to delete and what not. Keep in mind that said cache is destroyed when an Atoms::Base derived class gets destroyed, this includes the parser itself, which means that if you instantiate a Parser, parse something and want to keep using the results you have to call the clone method on the Result object, because the results are destroyed after the Source or the Parser are destroyed.

If you use a Transform with the Parser you don't have to make clones and whatever, because the apply method of the transformer returns an already cloned and usable Result that YOU have to delete when you're done with it. Again, remember that destroying the parent of a Result (if it's an Hash or an Array) destroys all the children. If you just use the String values you won't have this problems.