Spartan

Spartan is a small Lisp dialect that serves me as a test bed for programming language features.

Currently implemented features are:

• executable language grammar defined as a (PEG parser generator)-generated parser,
• recursion by way of letrec conversion with strongly conected components reordering & assignment conversions,
• a first-class module system with a shorthand accessor syntax (module, structure and foo.bar).
• continuations - both delimited (shift & reset) as well as undelimited (letcc),
• exception handling with restarts (raise & handle) relying on the continuations,
• actor model (spawn, send, recv),
• a built-in, Rete-based Rule Based System (signal!, assert!, retract!, select and notify-whenever),
• two compilation targets (ES6, r7rs),
• extensive compilation error handling with precise error locations and colored terminal output,
• a CLI tool sprtn with support for compile, run and repl commands,
• an interactive REPL with a twist,
• Unicode support in identifiers.

See here for some usage examples. You can run these examples with:

## Compiler Run `./build.sh` to build the compiler CLI. The compiler is far from being useful, it performs only rudimentary low-hanging fruit optimizations & validations. It loosely follows the nanopass framework, with currently implemented passes being: - parsing, - built-in macro expansion, - syntax tree elaboration, - implicit body handling, - quasiquote expansion, - constant value annotation, - free-variable annotation, - binding form analysis, - syntax tree validation, - alpha conversion, - built-in function inlining, - user function inlining, - constant propagation, - constant folding, - common subexpression elimination, - copy propagation, - dead code elimination, - `letrec` binding reordering, - `letrec` conversion, - continuation passing style transformation, - flat closure conversion, - global value hoisting, - target-safe name mangling, - target code generation. ## REPL The REPL supports a traditional flow of read-eval-print - each line entered is executed automatically and the results are printed immediately:

There's also a _basic_ twist - the REPL accepts a full listing and allows editing it line by line: