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Roadmap

007 is still a v0.x.x product. We make no particular guarantees about backwards compatibility yet, as we're heading towards some kind of publicly releasable stable condition.

Most of the forward-looking and thinking happens in the issue queue, and that's still the place to go to for all the nitty-gritty details about planning and tradeoffs. But the picture given by the issue queue is conveys no sense of priorities or ordering. That's what this roadmap is for.

About versions: we (masak and sergot) are still not convinced that 007 needs versions. We probably won't do releases of any kind. 007 is not really meant to have downstream consumers. It's not even meant to be a real, usable language. For the purposes of this roadmap, however, the versions are a way to structure milestones and hang important features off of them.

Driving examples

After most of the rest of the roadmap was written, one issue in particular emerged as setting the agenda for what needs to be done short-term with 007: #194. It has proved to be important because it re-focuses 007 to get useful and usable macros ASAP.

Here's the current proposed order of macro examples to tackle:

  • An infix:<ff> macro, same as Perl 6's operator. This macro hits a sweet spot of being simple and also clearly needing to be a macro. It ends up being code with some private state, since hitting the same ff expression several times will have results depending on what has happened to that expression before. (#207)

  • A swap macro. Takes two lvalues and swaps their contents. The term "lvalue" here is significant, as these need to be assignable. (That's also why a simple sub wouldn't be enough in this case, since we have call-by-value.) This macro needs the location protocol to be in place in order to work fully. (#218)

  • Reduction metaoperator, such as [+](1, 2, 3). In 007, the [+] would parse into a code-generated anonymous subroutine. This one is interesting for two reasons. First, it really uses closures and hygiene all-out. Second, it requires is parsed to be implemented enough to pass the + part of [+] as a parameter to the macro so that it can be part of the generated code. (#176)

  • postfix:<++> and family; a total of four operators. Also requires the location protocol. (#122)

  • += assignment operators and family. Requires both the location protocol and is parsed. (#152)

  • .= mutating method call. Also requires both the location protocol and is parsed. (#203)

  • Unbound methods. Something like unbound .abs to denote the longer sub (obj, ...args) { return obj.abs(...args); }. (#202)

  • Arrow functions. Something like x => x * x to denote the longer sub (x) { return x * x; }. (#215)

  • Ternary operator ?? !!. Also needs is parsed. (#163)

  • each() macro. This one is interesting because it's built using a statement macro inside of it. (#158)

These are features/bug fixes that will need to be in place for the above to work:

  • Some lingering injectile trouble. (#212)
  • The location protocol. (See below.) (#214)
  • is parsed, or at least enough of it. (#177)
  • Various Qnode introspection and manipulation. (No issue for this yet.)

Pre-v1.0.0

Work on 007 falls into two main tracks:

  • Features that help explore macro-like things (ultimately for Perl 6)
  • Features for 007 the language (ultimately for 007)

The first track is still the raison d'être for 007. The second track rounds 007 off as a nicer tool to work with.

Macro track

  • The big focus is quasi unquotes, a big part of making simple macros work as expected. The champion on this one is masak.
  • Make unhygienic declarations that are injected into code actually declare stuff. We can cheat majorly at this one at first, as long as it works.
  • is parsed.

Language track

General cleanup that should happen before v1.0.0

Post-v1.0.0

As v1.0.0 rolls by, it might be good to take stock and decide a new focus for the next major version. However, from this vantage point, these are the expected areas of focus after v1.0.0.

Two things would be worthy enough to produce a v2.0.0 version. Either 007 being bootstrapping enough to have both a runtime and a parser written in itself; or 007 having all three of regular macros, syntax macros, and visitor macros.

Various protocols

XXX Will have to describe these protocols more in detail later. All the information is currently scattered in the issue queue, which is what this roadmap is meant to counteract.

Suffice it to say for now that "protocols" seem to be a fruitful approach to making a language both extensible, introspectable, and bootstrappable all at once.

  • boolification protocol
  • equality protocol
  • location protocol
  • loop protocol
  • declaration protocol
  • signature binder protocol
  • control flow protocol