Tree @env-data-map (Download .tar.gz)
Robin
Version 0.5. Work-in-progress, subject to change.
Overview
Robin is an excessively principled functional programming language with eager evaluation, latent typing, and a homoiconic syntax, based on a radically simple core semantics in which the macro, rather than the function, is the fundamental abstraction.
Expressions in Robin are referentially transparent; programs interact with the outside world through a reactive framework.
For more information, see the extended description below.
Quick Start
The Robin reference interpreter is written in (about 700 lines of) Haskell;
to use it you'll need an implementation of Haskell installed (typically either
ghc
or Hugs).
If you have shelf installed, you can just run shelf_dockgh catseye/Robin
.
If not, you can clone this repository, cd
into the repo directory, and run
./build.sh
to build the reference interpreter. (If you don't have ghc
, no executable will
be built, but the bin/robin
script will use runhaskell
or runhugs
instead.)
You can then run it on one of the example Robin sources in eg
like so:
bin/robin eg/hello-world.robin
You should see
Hello, world!
To continue learning to program in Robin you can follow The Robin Tutorial.
Testing
If you have a few minutes to spare, and you have Falderal installed, you can run the test suite (consisting of more than 400 unit tests) by running
./test.sh
The tests that use only Robin's core semantics (--no-builtins
flag) are quite
slow, so you may want to skip them. You can skip them by running
APPLIANCES="appliances/robin.md" ./test.sh
There are also some QuickCheck tests which you can run with
ghc -isrc src/QuickCheckTests.hs -e testAll
Extended Description
For experienced programmers, Robin might be best described by listing the languages that have had the strongest influences on it:
Scheme
Like Scheme, Robin is eagerly evaluated, latently typed, and homoiconic, as well as properly tail-recursive and lexically scoped (at least by default), and tries hard to be well-defined and system-agnostic, but (as you can read below) diverges significantly from Scheme in other ways.
Forth
Like Forth, Robin has a radically simple core semantics. There are 15 intrinsic operations; every symbol in the standard library is defined in terms of these intrinsics, while an implementation is free to provide its own (perhaps more efficient) implementation of any such symbol. (See also Pixley).
PicoLisp
PicoLisp allows functions that do not evaluate their arguments. Robin
takes this concept and calls it a macro
, and builds everything else on
top of it. There is a function
form in Robin, but it's defined as a macro!
Haskell
Like Haskell, Robin is referentially transparent (often described as "purely functional") — mutation of values is forbidden. (Robin intentionally does not, however, adopt lazy evaluation or a static type system.)
Elm
Reactive programs in Robin are built by composing transducers which are driven by events and produce effects (which are modelled as further events), in a manner very similar to The Elm Architecture.
Bourne shell
Arbitrary text can by embedded in a Robin program using a syntax very much like a "heredoc", except it is an S-expression.
English
Deserves at least a passing mention here, as one thing that Robin
discards from Scheme is its jargony terminology: no cdr
, no cons
,
no lambda
.
For a full description of the Robin language, see the Robin specification document.
Repository Layout
- appliances/ — test appliances for the literate test suite.
- bin/ — driver script, destination for executable when built.
- demo/ — contains HTML5 document demonstrating build to JS by Haste.
- doc/ — Tutorial, specification, rationale, etc.
- eg/ — example programs written in Robin
- src/ — Haskell source for reference interpreter.
- stdlib/ — normative definitions of standard library symbols.
- HISTORY.md — history of this distribution.
- TODO.md — plans.
Commit History
@env-data-map
git clone https://git.catseye.tc/Robin/
- Merge branch 'develop-0.5' into env-data-map Chris Pressey 5 years ago
- More justfication. Chris Pressey 5 years ago
- Merge branch 'develop-0.5' into env-data-map Chris Pressey 5 years ago
- Reminder. Chris Pressey 5 years ago
- Explain a bit about Robin being excessively principled. Chris Pressey 5 years ago
- Merge branch 'develop-0.5' into env-data-map Chris Pressey 5 years ago
- Small improvements to test script. Chris Pressey 5 years ago
- Implement Envs as Data.Map.Strict internally. Most tests pass. Chris Pressey 5 years ago
- Unused (now) function. Chris Pressey 5 years ago
- Syntax. Chris Pressey 5 years ago