HST is a library and set of command-line programs for processing CSP scripts. The goal for the 1.0 release is to support refinement checking in the traces (T), stable failures (F), and failures-divergences (N) semantic models, all of which are described in .
HST is divided into two major sections: the CSP₀ library, written in C++, and the CSPM libary, written in Haskell. C++ was chosen for speed, since all LTS generation and refinement checking happens in the CSP₀ library. Haskell was chosen since CSPM is a lazy, functional lanaguage — this us allows to use the same features of Haskell and not have to implement a lazy functional interpreter ourselves.
For installation instructions, please see the INSTALL file. There are currently two command-line programs — “cspm” and “csp0”. The first allows you evaluate expressions in a CSPM script, and to compile CSPM process expressions into the corresponding CSP₀. The second allows you to perform refinement checks on these compiled CSP₀ scripts. Each program is self-documented; run “csp0 help” or “cspm help” for usage details. The CSP₀ language is described in the csp0.html file, which should be installed as part of the standard installation process. The most recent (and complete) description of the CSPM language can be found in the FDR2 reference manual .