Crate rustsat

rustsat - A Comprehensive SAT Library for Rust

rustsat is a collection of interfaces and utilities for working with the boolean satisfiability problem in Rust. This library aims to provide implementations of elements commonly used in the development of software in the area of satisfiability solving. The focus of the library is to provide as much ease of use without giving up on performance.

Example

let mut instance: SatInstance = SatInstance::new();
let l1 = instance.new_lit();
let l2 = instance.new_lit();
instance.add_binary(l1, l2);
instance.add_binary(!l1, l2);
instance.add_unit(l1);
let mut solver = rustsat_minisat::core::Minisat::default();
solver.add_cnf(instance.as_cnf().0).unwrap();
let res = solver.solve().unwrap();
assert_eq!(res, SolverResult::Sat);
let sol = solver.full_solution().unwrap();
assert_eq!(sol[l1.var()], TernaryVal::True);
assert_eq!(sol[l2.var()], TernaryVal::True);

Crates

The RustSAT project is split up into multiple crates that are all contained in this repository. These are the crates the project consists of:

Crate	Description
rustsat	The main library, containing basic types, traits, encodings, parsers, and more.
rustsat-tools	A collection of small helpful tools based on RustSAT that can be installed as binaries. For a list of available tools, see this directory with short descriptions of the tools in the headers of the files.
rustsat-<satsolver>	Interfaces to SAT solvers that can be used alongside rustsat. Currently interfaces are available for cadical, kissat, glucose, and minisat.
rustsat-ipasir	IPASIR bindings to use any compliant solver with rustsat.

Installation

To use the RustSAT library as a dependency in your project, simply run cargo add rustsat. To use an SAT solver interface in your project, run cargo add rustsat-<satsolver>. Typically, the version of the SAT solver can be selected via crate features, refer to the documentation of the respective SAT solver crate for details.

To install the binary tools in rustsat-tools run cargo install rustsat-tools.

Features

Feature name	Description
optimization	Include optimization (MaxSAT) data structures etc.
multiopt	Include data structures etc. for multi-objective optimization.
compression	Enable parsing and writing compressed input.
fxhash	Use the faster firefox hash function from rustc-hash in rustsat.
rand	Enable randomization features. (Shuffling clauses etc.)
ipasir-display	Changes Display trait for Lit and Var types to follow IPASIR variables indexing.
bench	Enable benchmark tests. Behind feature flag since it requires unstable Rust.
internals	Make some internal data structures for e.g. encodings public. This is useful when basing a more complex encoding on the rustsat implementation of another encoding. Note that the internal API might change between releases.

Examples

For example usage refer to the small example tools in the rustsat-tools crate at tools/src/bin. For a bigger example you can look at this multi-objective optimization solver.

Modules

• encodings
  Encodings for Common Constraint Types to CNF
• instances
  Satisfiability and Optimization Instance Representations
• solvers
  Interfaces to SAT Solvers
• types
  Common Types for SAT Solving
• utils
  Library-Internal Utilities

Macros

• clause
  Creates a clause from a list of literals
• ipasir_lit
  More easily creates literals with IPASIR/DIMACS indexing (starts from 1) and negation (negative value is negation). Mainly used in tests.
• lit
  More easily creates literals. Mainly used in tests.
• var
  More easily creates variables. Mainly used in tests.

Structs

• NotAllowed
  Error returned if the user tries to perform an action that is not allowed
• RequiresClausal
  Error returned if an operation requires clausal constraints, but this is not the case
• RequiresSoftLits
  Error returned if an operation requires an objective represented as soft literals, but this is not the case

Enums

• OutOfMemory
  Error returned when an operation ran out of memory