Alan Manuel Gloria: > How about "SAME"? "|" ?? Yep, that's my plan.
> (isn't that usually used for "alternative" in > most parser parser syntaxes?) Sure, but like any language, constants get quoted, so there's no ambiguity in ANTLR (or Parsec). > I'm a little busy this week to next week (big Xmas celebration(s)), so > my only contributions will be random ideas, sadly. Okay. I'm going to try a few experiments with ANTLR. What I've learned so far: * There are minor syntax differences from current notation. It uses ":" not "::=", and ";" terminates productions. Its error reports are confusing if you do them differently, so look for that *first* when an error is reported. Annoyingly it doesn't accept "-" in names (e.g., "s-expr"), but it accepts underscore (e.g., "s_expr"), so that's liveable. * More significantly, you must have exactly ONE definition for a production. You can't say: i_expr : one_way; i_expr : another_way; it must be: i_expr : one_way | another_way; * And you can't even have the same prefixes within one production, so instead of: i_expr: a b | a c ; you must say: i_expr: a (b | c); The last two points are a little limiting/annoying. I guess this would make it a little easier to show the BNF/code correspondence, but I fear that this limit will make the BNFs more complicated than they need to be. Getting it *all* to work with ANTLR is a pain. Indeed, I can so some parsing, but still haven't gotten the Java compiler working properly on either Windows or Fedora. I haven't tried very hard yet, to be fair. On the other hand, the ANTLRWorks GUI is kind of snappy. Syntax coloring is useful, of course. The graphical display of how an input was parsed into a tree *is* especially useful. It can also graphically show rules; these are really pretty but they look pretty useless to me. I've ordered an ANTLR and Haskell book for myself for Xmas. Merry Christmas to me! > Laptop hdd also crashed recently, so I need to fix my new keys for proper > sourceforge > access. Ugh!! Sorry to hear that. Hope things go better from here on. --- David A. Wheeler ------------------------------------------------------------------------------ LogMeIn Rescue: Anywhere, Anytime Remote support for IT. Free Trial Remotely access PCs and mobile devices and provide instant support Improve your efficiency, and focus on delivering more value-add services Discover what IT Professionals Know. Rescue delivers http://p.sf.net/sfu/logmein_12329d2d _______________________________________________ Readable-discuss mailing list Readable-discuss@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/readable-discuss
