https://github.com/kowainik/idris-patricia

🌋 Idris implementation of patricia tree
https://github.com/kowainik/idris-patricia

algorithm containers data-structure idris persistence

Last synced: about 2 months ago
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🌋 Idris implementation of patricia tree

• Host: GitHub
• URL: https://github.com/kowainik/idris-patricia
• Owner: kowainik
• License: mit
• Created: 2017-10-12T14:35:18.000Z (about 7 years ago)
• Default Branch: main
• Last Pushed: 2020-11-06T17:55:51.000Z (about 4 years ago)
• Last Synced: 2024-08-02T13:33:04.616Z (5 months ago)
• Topics: algorithm, containers, data-structure, idris, persistence
• Language: Idris
• Homepage: https://kowainik.github.io/projects/idris-patricia
• Size: 15.6 KB
• Stars: 22
• Watchers: 5
• Forks: 1
• Open Issues: 7
• Metadata Files:
  • Readme: README.md
  • Contributing: CONTRIBUTING.md
  • License: LICENSE
  • Codeowners: CODEOWNERS

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README

        
# idris-patricia

[![Build status](https://secure.travis-ci.org/kowainik/idris-patricia.svg)](http://travis-ci.org/kowainik/idris-patricia)

[![MIT license](https://img.shields.io/badge/license-MIT-blue.svg)](LICENSE)

This package implements map from integer key to values. Data structure can be used as persistent array. Implementation is based on article about patricia trees and on [existing Haskell implementation](https://hackage.haskell.org/package/containers-0.5.10.2/docs/Data-IntMap-Lazy.html) from [`containers`](http://hackage.haskell.org/package/containers) package. Dependent types can help to ensure some invariants for data structure.

## REPL examples

```idris

λΠ> the (Int32Map String) $ insert 3 "a" Empty

Leaf (MkBits 3) "a" : IntBitMap 32 String

λΠ> the (Int32Map String) $ delete 3 $ insert 3 "a" Empty

Empty : IntBitMap 32 String

λΠ> the (Int32Map String) $ insert 2 "c" $ insert 4 "b" $ insert 3 "a" Empty

Bin (MkBits 3)

    (FS (FS FZ))

    (Bin (MkBits 2) FZ (Leaf (MkBits 2) "c") (Leaf (MkBits 3) "a"))

    (Leaf (MkBits 4) "b") : IntBitMap 32 String

λΠ> toList $ the (IntBitMap 32 String) $ insert 2 "c" $ insert 4 "b" $ insert 3 "a" Empty

["c", "a", "b"] : List String

```

## How to build

### Nix

Just run this command to build project and run tests.

```bash

nix-shell -A idris-patricia --command "bash install-dependencies.sh && idris --testpkg patricia-nix.ipkg --idrispath dependencies/specdris/src"

```

### No-Nix

1. Install [`specdris`](https://github.com/pheymann/specdris) following instructions from repository.

2. Run `idris --testpkg patricia.ipkg`.