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tool (Pre-C-Compiler eXtended) An infinite-lookahead
Specification scripts are in very EBNF with inheritedattributes and synthetic attributes allowed. Scripts can
be compiled in separate modules and linked later.
Meta-production rules are allowed. Grammars can be
essentially LL(oo) with optimisations. A converter for yacc
scripts is available.
Versions 1.xx were known as "PRECC" and only had unbounded
lookahead. The 2.xx series added the "X" for "extended" and
featured higher order parameterisation (inherited attributes).
Version 2.42 integrates inherited and synthesized attributes
by using a "monadic" model for parsing. You can now synthsize
attributes during the pass and inherit them in the remainder,
@ foo = barx gum(x)
synthesises an x in bar and passes it down into gum as a
parameter. Useful for @ what = ?x did_you_say(x), for
example. It now compiles into C instead of running an
interpreter at parse-time.
Version 2.42 runs under Unix and MS-DOS.
E-mail: Peter Breuer [email protected], Jonathan Bowen
["The PRECC Compiler-Compiler" by P.T. Breuer and J.P. Bowen.
In E. Davies and A. Findlay (eds.), Proc. UKUUG/SUKUG Joint
New Year 1993 Conference, St. Cross Centre, Oxford, UK, 6-8
January 1993, ISBN 1 873611 06 4 (UKUUG), 0 9520700 0 6
(SUKUG) UKUUG/SUKUG Secretariat, Owles Hall, Buntingford,
Herts SG9 9PL, UK, pp 167-182, 1993].