Project

rbsiev

0.0
The project is in a healthy, maintained state
An evaluator of Scheme language written in Ruby, which is implemented in SICP Chater 4.
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 Dependencies

Runtime

>= 0.1.3
>= 0.1.4
 Project Readme

Rbsiev

Build Status

SICP evaluator in Ruby.

Or, Ruby で書いた SICP の evaluator.

It is intended to be a part of Scheme implementation written in Ruby.

Installation

Execute:

$ gem install rbsiev

Usage

Run the simple REPL as:

$ rbsiev

Then, you can input Scheme program.

Supported Syntax

In 0.1.0, the evaluator mostly corresponds to the one in SICP 4.1.1 - 4.1.6.

See the wiki page for more information about the progress of implementing.

Literals

  • boolean value (#f and #t),
  • an empty list (()),
  • a string enclosing with double-quotations, such "hoge"
  • numbers (integer, real, rational, and complex)

Primitive procedures

  • arithmetic operators (+, -, *, /, %),
  • comparison operators (=, <, >, <=, >=)
  • cons, car, cdr
  • null?, pair?, list?, number?
  • list, append
  • write, display

Syntax to be evaluated

  • lambda expression
    • such (lambda (n) (+ n 1))
  • procedure application
    • such (foo 1)
  • conditional expression
    • if, cond, when, unless
  • logical test
    • and, or
  • assignment
    • set!
  • definition
    • define
  • sequence
    • begin
  • local bindings
    • let, let*, letrec, letrec*
  • loop
    • do

Related projects

Development

After checking out the repo, run bin/setup to install dependencies. Then, run rake test to run the tests. You can also run bin/console for an interactive prompt that will allow you to experiment.

To install this gem onto your local machine, run bundle exec rake install. To release a new version, update the version number in version.rb, and then run bundle exec rake release, which will create a git tag for the version, push git commits and tags, and push the .gem file to rubygems.org.

Contributing

Bug reports and pull requests are welcome on GitHub at https://github.com/mnbi/rbsiev.

License

The gem is available as open source under the terms of the MIT License.