Community Repository

This is an open repository dedicated to contributions from the TLA+ community. Here you can submit the snippets, operators, and modules that you wrote for your specifications and that you want to share with the rest of the TLA+ community.

(For us to gauge demand, please star (eyes up and right) this repository if you use the CommunityModules.)

The Modules

| Name | Short description | Module Override? | Contributors | | ---: | ---- | :--: | ---- | | BagsExt.tla | Additional operators on bags (e.g. BagAdd, BagRemove, FoldBag, etc.) | ✔ | @muenchnerkindl, @lemmy | | Bitwise.tla | Bitwise And and shift-right. | ✔ | @lemmy, @pfeodrippe | | Combinatorics.tla | Binomial coefficient (N choose K) and factorial operator | ✔ | @lemmy | | CSV.tla | Operations on CSV files | ✔ | @lemmy | | DifferentialEquations.tla | see page 178 of Specifying Systems | | Leslie Lamport | | DyadicRationals.tla | Operations on dyadic rational numbers | ✔ | @lemmy | | FiniteSetsExt.tla | Additional operators on finite sets (e.g. FoldSet, Min, Max, Quantify, etc.) | ✔ | @hwayne, @lemmy, @quicquid, @mryndzionek, @will62794, @konnov | | Folds.tla | Basic Fold operator (MapThenFoldSet). | | @quicquid, @muenchnerkindl, @konnov | | Functions.tla | Notions about functions (range, anti-function, injection, surjection, bijection) and folds (FoldFunction, FoldFunctionOnSet). | ✔ | Thomas L. Rodeheffer, @muenchnerkindl, @quicquid, @lemmy | | Graphs.tla | Common operators on directed and undirected graphs | | Leslie Lamport, @lemmy, @muenchnerkindl | | GraphViz.tla | Generate GraphViz file through TLC | ✔ | @lemmy | | HTML.tla | Format strings into HTML tags | | @afonsof | | IOUtils.tla | Input/Output of TLA+ values & Spawn system commands from a spec. | ✔ | @lemmy, @lvanengelen, @afonsof | | Json.tla | JSON serialization and deserialization into TLA+ values. | ✔ | @kuujo, @lemmy, @jobvs, @pfeodrippe | | Relation.tla | Basic operations on relations, represented as binary Boolean functions over some set S. | | @muenchnerkindl, @lemmy | | SequencesExt.tla | Additional operators on sequences (e.g. ToSet, Reverse, ReplaceAll, SelectInSeq, etc.) | ✔ | @muenchnerkindl, @lemmy, @hwayne, @quicquid, @konnov, @afonsof | | ShiViz.tla | Visualize error-traces of multi-process PlusCal algorithms with an Interactive Communication Graphs. | | @lemmy | | Statistics.tla | Statistics operators (ChiSquare, etc.) | ✔ | @lemmy | | SVG.tla | see will62794/tlaplus_animation | ✔ | @will62794, @lemmy | | TLCExt.tla | Assertion operators and experimental TLC features (now part of TLC). | ✔ | @lemmy, @will62794 | | VectorClocks.tla | Causal order operations on vector clocks (e.g. CausalOrder, IsCausalOrder) | ✔ | @lemmy |

How to use it

You must be running Java 9 or higher.

Just copy & paste the snippet, the operators, or the set of modules you are interested in.

Alternatively, clone this repository and pass -DTLA-Library=/path/to/CommunityModules/modules when running TLC.

Another option is to download a library archive and add it to TLC's or the Toolbox's TLA+ library path. The advantage of doing this is that TLC will evaluate an operator faster if the operator comes with a Java implementation (see e.g. SequencesExt.Java). The latest release is at the stable URL https://github.com/tlaplus/CommunityModules/releases/latest/download/CommunityModules-deps.jar.

If you are using the Toolbox, add the library archive under File > Preferences > TLA+ Preferences > TLA+ library path locations.

If you are using the VS Code extension, a recent version of the community modules is bundled with the nightly build. If you are not using the nightly build or need to use another version, see this.

If you are running TLC via tla2tools.jar, ensure the JAR is on the classpath: either place it next to tla2tools.jar or add it explicitly with java -cp tla2tools.jar:CommunityModules-deps.jar ....

Being a community-driven repository puts the community in charge of checking the validity and correctness of submissions. The maintainers of this repository will try to keep this place in order. Still, we can't guarantee the quality of the modules and, therefore, cannot provide any assistance on eventual malfunctions.

Contributing

If you have one or more snippets, operators, or modules you'd like to share, please open an issue or create a pull request. Before submitting your operator or module, please con