https://github.com/mame/radiation-hardened-quine

A robust quine program that works even after any one character is deleted.
https://github.com/mame/radiation-hardened-quine

Last synced: 15 days ago
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A robust quine program that works even after any one character is deleted.

• Host: GitHub
• URL: https://github.com/mame/radiation-hardened-quine
• Owner: mame
• Created: 2014-02-20T15:33:40.000Z (over 10 years ago)
• Default Branch: master
• Last Pushed: 2021-09-06T14:58:51.000Z (about 3 years ago)
• Last Synced: 2024-04-13T19:32:51.064Z (7 months ago)
• Language: Ruby
• Size: 114 KB
• Stars: 674
• Watchers: 14
• Forks: 25
• Open Issues: 3
• Metadata Files:
  • Readme: README.md

Awesome Lists containing this project

• awesome-self-reference - A radiation hardened quine - A Ruby quine that remains a quine after any one of the characters in its source code is removed. (Computing)

README

        
# Radiation-hardened Quine

This is a *robust* self-printing program written in Ruby.

It works even if you delete one character *anywhere* from the code.

## How to play

### Normal usage

Just run `rquine.rb` and check if the output is equal to the original code:

    $ ruby rquine.rb > rquine2.rb

    $ diff rquine.rb rquine2.rb

### Abnormal usage

Prepare a script that deletes one character randomly:

    $ cat mutate.rb

    src = ARGF.read

    src[rand(src.size), 1] = ""

    print src

Generate a broken program by deleting one character from `rquine.rb`:

    $ ruby mutate.rb rquine.rb > broken.rb

Run the broken program:

    $ ruby broken.rb > rquine2.rb

You will see the output exactly equal to the original code:

    $ diff rquine.rb rquine2.rb

## History

  - `old-rquine.rb` is the first version based on a trivial redundancy approach

    (having two copies of the main code).

  - `flagitious.rb` is the smarter version that repairs itself instead of redundancy.

    It was created by Darren Smith aka. flagitious.  Thank you flagitious!

    (Note that this version only works with 1.8.7.)

  - `rquine.rb` is the latest "ascii-art" version based on flagitious's approach.

    It works with 1.9 or later.

## See also

  - [Perl version][1] (attributed to Shinichiro Hamaji)

[1]: http://d.hatena.ne.jp/shinichiro_h/20140220#1392834649

## License

Copyright (c) 2014 Yusuke Endoh (@mametter), @hirekoke

MIT License

Permission is hereby granted, free of charge, to any person obtaining

a copy of this software and associated documentation files (the

"Software"), to deal in the Software without restriction, including

without limitation the rights to use, copy, modify, merge, publish,

distribute, sublicense, and/or sell copies of the Software, and to

permit persons to whom the Software is furnished to do so, subject to

the following conditions:

The above copyright notice and this permission notice shall be

included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,

EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF

MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND

NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE

LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION

OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION

WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.