https://github.com/diekmann/isabelle-hello-world

Hello World in Isabelle, compiled to Haskell
https://github.com/diekmann/isabelle-hello-world

functional-programming haskell isabelle-hol

Last synced: 24 days ago
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Hello World in Isabelle, compiled to Haskell

• Host: GitHub
• URL: https://github.com/diekmann/isabelle-hello-world
• Owner: diekmann
• License: mit
• Created: 2017-08-11T15:27:19.000Z (over 7 years ago)
• Default Branch: main
• Last Pushed: 2021-10-08T18:34:12.000Z (over 3 years ago)
• Last Synced: 2024-10-29T20:03:21.460Z (2 months ago)
• Topics: functional-programming, haskell, isabelle-hol
• Language: Isabelle
• Size: 57.6 KB
• Stars: 2
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Isabelle-Hello-World

Hello World in Isabelle, compiled to Haskell.

# Example

Isabelle

```Isabelle

definition main :: "unit io" where

  "main ≡ do {

               _ ← println (STR ''Hello World! What is your name?'');

               name ← getLine;

               println (STR ''Hello, '' + name + STR ''!'')

             }"

```

compiles to

```Haskell

main :: Prelude.IO ();

main =

  (StdIO.println

    "Hello World! What is your name?") >>= (\ _ ->

     StdIO.getLine >>= (\ name -> StdIO.println (("Hello, " ++ name) ++ "!")));

```

executes

```

$ runhaskell Main.hs

Hello World! What is your name?

Corny

Hello, Corny!

```

# Contributing

 * Keep it simple! I want simple, understandable, well-documented examples.

 * Don't rewrite simple examples to a super generic, highly abstract meta model.

   Feel free to push the super generic, highly abstract meta model in a separate file and explain *how* and *why* the

   base model needs to be extended.

# Things I'd like to see

 * Socket server.

 * String handling.

 * `println "foo" >> println "bar"` and a *proof* that I got `foo\nbar\n` on my STDOUT [[done]](HelloWorld_Proof.thy).

 * `now >>= \time -> println $ "the time is now " ++ time`.

 * Read a number from STDIN, increment the number and output it.