This is the source code repository for my paper Tutorial implementation of Hoare logic in Haskell. In the src folder you will find:

• Common.hs, PrettyPrinter.hs - Various utility functions
• Gentzen.hs - Implementation of Propositional calculus
• TNT.hs - Implementation of Typographical Number Theory
• Hoare.hs - Implementation of Hoare logic (on top of Propositional calculus + Number theory)
• Imp.hs - Implementation of a simple imperative programming language (the commands correspond to the rules of Hoare logic)

The folder paper contains the source code of the paper. The built paper can be downloaded from https://arxiv.org/abs/2101.11320.

See it in action on my mobile phone on this Tweet

Make sure you have the Haskell Tool Stack installed, or Hugs.

Check the files in the examples folder - each implementation of the system has a corresponding example file.

For instance, to run the proof for the countToB program defined in the paper, execute the following commands:

• stack repl examples/ExampleHoare.hs --ghci-options -iexamples --ghci-options -isrc
• Once in the REPL mode, evaluate putStrLn $ pr proof

For hugs, while in the src folder, run hugs -F"cpphs-hugs --noline -D__HUGS__" ../examples/ExampleHoare.hs

Copyright 2021, Boro Sitnikovski. All rights reserved.