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CLU reference manual.

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Written in R.
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Lars Brinkhoff
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.am table_of_contents
. rs
. bp
. sp
3Detailed Description*
. sp
. em
.ec e epsilon
.sr syntax_pdx I
.chapter "Notation"
.para 1
We use an extended BNF grammar to define the syntax.
The general form of a production is:
.show
.def nonterminal alternative
.or alternative
.or ```...
.or alternative
.eshow
.para 1
The following extensions are used:
.nr fff fheight/4
.show
a , etc stab(1)stands for stab(2)lparen!a vbar a , a vbar a , a , a vbar (fff!m)...rparen
lcurly!arcurlytab(1)stands fortab(2)lparen\e vbar a vbar a a vbar a a a vbar (fff!m)...rparen
lbkt!arbkttab(1)stands fortab(2)lparen\e vbar arparen
.eshow
.para 1
All semicolons are optional in CLU,
but for simplicity they appear in the syntax without enclosing meta-brackets.
Nonterminal symbols appear in normal face.
Reserved words appear in bold face.
All other terminal symbols are non-alphabetic,
and appear in normal face.
.para
Full productions are not always shown in the body of this document;
often alternatives are presented and explained individually.
Appendix`syntax_pdx contains the complete syntax.