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# plasp [![GitHub Release](https://img.shields.io/github/release/potassco/plasp.svg?maxAge=3600)](https://github.com/potassco/plasp/releases) [![Build Status](https://img.shields.io/travis/potassco/plasp/master.svg?maxAge=3600&label=build%20%28master%29)](https://travis-ci.org/potassco/plasp?branch=master) [![Build Status](https://img.shields.io/travis/potassco/plasp/develop.svg?maxAge=3600&label=build%20%28develop%29)](https://travis-ci.org/potassco/plasp?branch=develop)
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> ASP planning tools for PDDL
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## Overview
`plasp` is a tool collection for planning in [*answer set programming*](https://en.wikipedia.org/wiki/Answer_set_programming).
`plasp` 3 supports the input languages [PDDL 3.1](https://helios.hud.ac.uk/scommv/IPC-14/software.html) (except for advanced features such as durative actions, numerical fluents, and preferences) and [SAS](http://www.fast-downward.org/TranslatorOutputFormat) (full support of SAS 3), which is used by [Fast Downward](http://www.fast-downward.org/).
The most notable tool provided by `plasp` is `plasp translate`, which translates PDDL descriptions to ASP facts.
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## Translating PDDL to ASP Facts
PDDL instances are translated to ASP facts as follows:
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```sh
plasp translate domain.pddl problem.pddl
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```
Alternatively, PDDL instances may first be translated to SAS, the output format of [Fast Downward](http://www.fast-downward.org/).
```sh
./fast-downward.py --translate --build=release64 domain.pddl problem.pddl
```
This creates a file called `output.sas`, which may now be translated by `plasp` as well.
```sh
plasp translate output.sas
```
### Solving the Translated Instance
The translated instance can finally be solved incrementally with `clingo` and a meta encoding, for instance, [`sequential-incremental.lp`](encodings/sequential-incremental.lp):
```sh
plasp translate domain.pddl problem.pddl > instance.lp
clingo encodings/sequential-incremental.lp instance.lp
```
### Translator Output Format
`plasp translate` provides a uniform output format for SAS and PDDL input problems.
See [output format](doc/output-format.md) for more details.
If you want to write your own meta encoding for `plasp translate`s output, this [simple example encoding](encodings/sequential-incremental.lp) gets you started.
## Provided Tools
```sh
plasp <command> [<option>...] [<input file>...]
```
Aside from translating PDDL to ASP facts, `plasp` provides the following commands:
| command | description |
|---|---|
| `translate` | Translate PDDL and SAS to ASP facts |
| `normalize` | Normalize PDDL to plasps custom PDDL format |
| `check-syntax` | Check the syntax of PDDL specifications |
| `beautify` | Cleanly format PDDL specifications |
| `help` | Display help message |
| `version` | Display version information |
`plasp help` shows a list of all commands provided by `plasp`.
To list all available options of a command, call `plasp <command> --help` or `plasp help <command>`.
`plasp` automatically detects the language (PDDL or SAS) of the input descriptions.
## Building
`plasp` is built with CMake and a C++ compiler.
See [building](doc/building.md) for more details.
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## Contributors
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* [Patrick Lühne](https://www.luehne.de)
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* Martin Gebser (encodings)
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* Torsten Schaub (encodings)
### Earlier Versions
* René Knaebel
* Murat Knecht