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https://github.com/ged/pushdown

A pushdown automaton toolkit for Ruby.
https://github.com/ged/pushdown

automaton pushdown-automaton state-machine

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A pushdown automaton toolkit for Ruby.

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README 

        
# Pushdown



home

: http://hg.sr.ht/~ged/Pushdown



code

: http://hg.sr.ht/~ged/Pushdown



github

: https://github.com/ged/pushdown



docs

: http://deveiate.org/code/pushdown



## Description



A pushdown automaton toolkit for Ruby. It's based on [the State Manager from

the Amethyst project][amethyst-state-manager].



It's still mostly experimental.



## Prerequisites



* Ruby



## Installation



    $ gem install pushdown



## Development



You can check out the current source with Git via Gitlab:



    $ hg clone http://hg.sr.ht/~ged/Pushdown

    $ cd Pushdown



After checking out the source, run:



    $ gem install -Ng

    $ rake setup



This task will install dependencies, and do any other necessary setup for development.



## Author(s)



* Michael Granger 



While Pushdown does not contain any [Amethyst Game Engine][amethyst] source code, it does borrow heavily from its ideas and nomenclature. Many thanks to the Amethyst team for the inspiration.



Thanks also to Alyssa Verkade for the initial idea.



## License



This gem includes code from the rspec-expectations gem, used under the

terms of the MIT License:



    Copyright (c) 2012 David Chelimsky, Myron Marston

    Copyright (c) 2006 David Chelimsky, The RSpec Development Team

    Copyright (c) 2005 Steven Baker

    

    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.



Pushdown itself is:



Copyright (c) 2019-2021, Michael Granger

All rights reserved.



Redistribution and use in source and binary forms, with or without

modification, are permitted provided that the following conditions are met:



* Redistributions of source code must retain the above copyright notice,

  this list of conditions and the following disclaimer.



* Redistributions in binary form must reproduce the above copyright notice,

  this list of conditions and the following disclaimer in the documentation

  and/or other materials provided with the distribution.



* Neither the name of the author/s, nor the names of the project's

  contributors may be used to endorse or promote products derived from this

  software without specific prior written permission.



THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"

AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE

FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL

DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR

SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER

CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,

OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.



[amethyst]: https://amethyst.rs/

[amethyst-state-manager]: https://book.amethyst.rs/stable/concepts/state.html#state-manager