The controller acts as an

Syntax semantics and timing

language
(S/SL) A high level specification language for recursive descent parsers developed by J.R. Cordy cordy@cs.queensu.ca and R.C. Holt at the University of Toronto in 1980.
S/SL is a small language that supports cheap recursion and defines input, output, and error token names (& values), semantic mechanisms (class interfaces whose methods are really escapes to routines in a host programming language but allow good abstraction in the pseudo-code) and a pseudo-code program that defines the syntax of the input language by the token stream the program accepts. Alternation, control flow and one-symbol look-ahead constructs are part of the language.
The S/SL processor compiles this pseudo-code into a table (byte-codes) that is interpreted by the S/SL table-walker (interpreter). The pseudo-code language processes the input language in recursive descent LL1 style but extensions allow it to process any LRk language relatively easily. S/SL is designed to provide excellent syntax error recovery and repair. It is more powerful and transparent than yacc but slower.
S/SL has been used to implement production commercial compilers for languages such as PL/I, Euclid, Turing, Ada, and COBOL, as well as interpreters, command processors, and domain specific languages of many kinds.
(ftp://ftp.cs.queensu.ca/pub/cordy/ssl).
["Specification of S/SL: Syntax/Semantic Language", J.R. Cordy and R.C. Holt, Computer Systems Research Institute, University of Toronto, 1980].
["An Introduction to S/SL: Syntax/Semantic Language", R.C. Holt, J.R. Cordy, and D.B. Wortman; ACM Transactions on Programming Languages and Systems (TOPLAS), Vol 4, No. 2, April 1982, pp 149-178].
["Hierarchic Syntax Error Repair", D.T. Barnard and R.C. Holt, International Journal of Computing and Information Sciences, Vol. 11, No. 4, August 1982, Pages 231-258.]
(2003-10-30)
See also:
  • History of Soviet design
You might also like
Working with date and time
Working with date and time
0510 Working with date and time
0510 Working with date and time
angela friederici - EEG/MEG and the time course of
angela friederici - EEG/MEG and the time course of ...
Tosbuy Mesh Slip on Water Shoes for Women(eu37,gray)
Shoes
  • Imported
  • Rubber sole
  • Open mesh on upper
  • lightweight and flexible
  • fabric upper
Related Posts