https://github.com/tortis/elm-sat

A simple DPLL SAT solver in Elm
https://github.com/tortis/elm-sat

dpll-algorithm elm elm-lang sat sat-solver

Last synced: 26 days ago
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A simple DPLL SAT solver in Elm

• Host: GitHub
• URL: https://github.com/tortis/elm-sat
• Owner: tortis
• License: mit
• Created: 2020-01-13T04:14:19.000Z (almost 5 years ago)
• Default Branch: master
• Last Pushed: 2020-01-13T06:50:40.000Z (almost 5 years ago)
• Last Synced: 2024-10-21T18:46:49.253Z (2 months ago)
• Topics: dpll-algorithm, elm, elm-lang, sat, sat-solver
• Language: Elm
• Homepage: https://package.elm-lang.org/packages/tortis/elm-sat/latest/
• Size: 22.5 KB
• Stars: 2
• Watchers: 2
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md
  • License: LICENSE

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README

        
# Elm Sat [![pipeline status](https://gitlab.com/findley/elm-sat/badges/master/pipeline.svg)](https://gitlab.com/findley/elm-sat/commits/master)

A simple [DPLL](https://en.wikipedia.org/wiki/DPLL_algorithm) sat solver implemented in Elm.

Note: This repository is maintained at https://gitlab.com/findley/elm-sat and mirrored to https://github.com/tortis/elm-sat.

## Usage

The Problem type is just an alias for `List (List Int)`. Variables (literals) are represented by integers where a negative integer indicates negation of the literal.

Sat problems must be in [CNF]() form.

```Elm

import Sat

problem : Sat.Problem

problem = [ [ 1, 2 ], [ 1, 3 ], [ 2, 3 ], [ -1, -2, -3 ], [ 2, 3 ], [ -2, -3 ] ]

solution : Maybe Sat.Solution

solution = Sat.solve problem -- Just [1,2,-3]

```

The Sat.Utils module exposes `fromDimacs` which will turn a DIMACS formatted string into a Problem.

## Performance

Elm Sat performance appears to be worse than [MiniSAT compiled to JS](https://jgalenson.github.io/research.js/demos/minisat.html). Adding benchmarks and improving performance are areas for future development.

## License

This code is distributed under the MIT license, see the [LICENSE](LICENSE) file.