chase-cps
Python interface to CHASE (Contract-based Heterogeneous Analysis and Systems Exploration), a framework for requirement capture, formalization, and validation of cyber-physical systems with assume-guarantee contracts.
The package contains the CHASE core library (contract representation and algebra) and a common interface to model checkers and synthesis tools.
from chase_cps import Contract, refines
spec = Contract.from_strings(inputs=["req"], outputs=["grant"],
assumptions=["G F !req"],
guarantees=["G (req -> F grant)"], name="Spec")
impl = Contract.from_strings(inputs=["req"], outputs=["grant"],
guarantees=["G (req -> X grant)"], name="Impl")
result = refines(impl, spec)
print(result.status) # valid, or invalid with a counterexample trace
The operations have the names of the commands of logics_tool. A contract
c has the methods compose, conjoin, disjoin, merge, divide
(quotient), separate, saturate, and simplify, which return new
contracts. The checks on contracts are refines, verify (is_compatible
and is_consistent), is_realizable, accepts, and implements;
synthesize builds a controller. The checks on formulas are implies and
is_satisfiable. remove_redundant drops the terms implied by the others. load_spec and
parse_spec read the contracts of a specification written in the logics
language of CHASE, and to_spec writes one.
Installation
$> pip install chase-cps
Wheels are available for Python 3.10 to 3.15 on Linux (x86_64 and aarch64, glibc 2.28 or later) and macOS 11 or later (arm64 and x86_64). Windows is not supported: use WSL or the CHASE Docker image.
Requirements
The package contains the CHASE library. The checks call external tools, which are not installed with the package:
- nuXmv for
refines,verify,implies,is_satisfiable,remove_redundant,accepts, andimplements. nuXmv is free for academic and non-commercial use. - slugs for
is_realizableandsynthesize.
The command chase-cps install downloads nuXmv from its site, and builds
slugs from its sources, into ~/.chase:
$> chase-cps install nuxmv --accept-license # Linux x86_64, macOS arm64
$> chase-cps install slugs # needs a C++ compiler, make, and Boost
On macOS, nuXmv needs the libraries of Homebrew (brew install libxml2 gmp libedit). On Linux it needs libxml2 and libedit2, and the C++ library of
GCC 13 or later (Ubuntu 24.04, Debian 13, Fedora 39, or newer);
chase-cps install says what is missing.
The tools can also be installed by hand: they are looked up in the PATH
and in ~/.chase/bin, or given with the environment variables CHASE_NUXMV
and CHASE_SLUGS. The command
$> chase-cps doctor
shows the tools found and how to install the missing ones.
Where nuXmv cannot be used (e.g. for commercial purposes), the checks run
with NuSMV (LGPL) instead: chase-cps install nusmv installs it on
Linux x86_64, or set CHASE_NUSMV.
Command line
chase-cps check checks the contracts of a specification written in the
logics language of CHASE, or of a JSON file, and prints the counterexamples:
$> chase-cps check specs.ltl # verify every contract
$> chase-cps check specs.ltl --refines Joint1+Joint2 Joints # composition refines Joints
$> chase-cps check specs.ltl --realizable Joint1 --json
The exit status is 0 when every check passes, and 1 when a check fails.
The source code and the installation instructions are in the chase repository.
1 maintainer
Metadata
1 maintainer
Release files for chase-cps 0.2.0
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