SX User`s Manual for SX version 2.0
Scheme is a lexically scoped, properly tail recursive dialect of the LISP programming language. The PACT implementation is described abstractly in Abelson and Sussman`s book, Structure and Interpretation of Computer Programs. It features all of the ``essential procedures`` described in the ``Revised Report on Scheme`` which defines the standard for Scheme. In PACT, Scheme is implemented as a library; however, a small driver delivers a stand alone Scheme interpreter. The PACT implementation features a reference counting incremental garbage collector. This distributes the overhead of memory management throughout the running of Scheme code. It also tends to keep Scheme from trying to grab the entire machine on which it is running which some garbage collection schemes will attempt to do. SX is perhaps the ultimate PACT statement. It is simply Scheme plus the other parts of PACT. A more precise way to describe it is as a dialect of LISP with extensions for PGS, PDB, PDBX, PML, and PANACEA. What this yields is an interpretive language whose primitive procedures span the functionality of all of PACT. Like the Scheme implementation which it extends, SX provides both a library and a stand alone application. The stand alone interpreter is the engine behind applications such as PDBView and PDBDiff. The SX library is the heart of TRANSL, a tool to translate data files from one database format to another. The modularization and layering make it possible to use the PACT components like building blocks. In addition, SX contains functionality which is the generalization of that found in ULTRA II. This means that as the development of SX proceeds, an SX driven application will be able to,perform arbitrary dimensional presentation, analysis, and manipulation tasks. Because of the fundamental unity of these two PACT parts, they are documented in a single manual. The first part will cover the standard Scheme functionality and the second part will discuss the SX extensions.
- Research Organization:
- Lawrence Livermore National Lab., CA (United States)
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- W-7405-ENG-48
- OSTI ID:
- 10167164
- Report Number(s):
- UCRL-MA-112315; ON: DE93015971
- Resource Relation:
- Other Information: PBD: 4 Jan 1993
- Country of Publication:
- United States
- Language:
- English
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