[antlr-interest] Summary/Cheat Sheet?

[Gerald B. Rosenberg]

Found this all-to-brief syntax summary in an old non-Antlr mailing 
list.  Anyone have something similar that is more complete?  In particular, 
including summary descriptions of the LT, LA, $, #, ##, n:TOKEN (variable 
reference) constructs.

Have not seen it in the Antlr.org documentation, but think that it would be 
a good addition.

Thanks,
Gerald


===================================================
ANTLR grammars are written in a kind of EBNF, which makes them very
readable:

rule
         :       TOKEN
         |       nonterminal
         |       (optional)?
         |       (zero_or_more)*
         |       (one_or_more)?
         ;

syntactic_predicates                    // finite lookahead, back-tracking
         :       (A A b) => A A b
         |       (A)* b
         ;

semantic_predicates
         :       { conditional_code; } => rule
         |       { conditional_code; } => rule
         |       foo
         ;

automatic Abstract Syntax Tree generation with grammar annotations (^):

mult_expr
         :       add_expr ((STAR^ | SLASH^) add_expr)
         ;

add_expr
         :       atom ((PLUS^ | MINUS^) atom)
         ;

----
Gerald B. Rosenberg, Esq.
NewTechLaw
285 Hamilton Avenue, Suite 520
Palo Alto, CA  94301-2576

650.325.2100  (office)  /  650.703.1724  (cell)
650.325.2107  (facsimile)

www.newtechlaw.com


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