Hey, Loring! Thanks for your help. Two questions: 1.) This does not help when you do major refactorings, doest it ;) 2.) Where do you store the information you gather in analysis? I stick them back into the tree or put them into (symbol-)tables. If you do so as well: What do you do if the tree data in tables has to be processed in subsequent tree transformation steps? How do you pass in the data?
Any thoughts? - Oliver 2010/1/25 Loring Craymer <[email protected]>: > Oliver-- > > Some key points: > 1.) Capture semantics rather than designing tree structures. > 2.) Preserve grammar structure--that is, rule a in pass n becomes rule a in > pass n+1 unless there is reason to do otherwise. > 3.) Avoid cluttering your grammars with action code. > 4.) Separate analysis passes from transformation passes. > > Follow those principles, and you'll find that rippling changes across > grammars is tedious, but not a real problem. > > --Loring > > > > > ----- Original Message ---- >> From: Oliver Zeigermann <[email protected]> >> To: antlr-interest Interest <[email protected]> >> Sent: Sun, January 24, 2010 1:03:35 AM >> Subject: [antlr-interest] Anyone in the whole world doing multi step tree >> transformation? >> >> Folks! >> >> I was just wondering if anyone except me is actually doing tree >> transformations using ANTLR. I use the tree transformation feature >> introduced in 3.1. While this does work well, it is so very hard to >> refactor or extend my tree structures as I have to change all my >> transformer stages and have no tool support to find out what to change >> and where. >> >> I started using heterogenous tokens with normalized children to make >> use of compiler type checking which helps, but does not comletely >> solve my issues as I still have an unchecked children list - which I >> need to traverse the tree using tree walkes. >> >> I was considering skipping the whole grammar driving tree >> transformation step, but what should I replace it with? >> >> I know of the xtext approach that uses non normalized heterogenous >> tokens generated from a common model shared by all transformation >> parts. Which seems like a good idea, however, does not seem to have a >> means powerful enough to do serious tree transformation. >> >> Any experiences? Hints? >> >> Thanks in advance >> >> - Oliver >> >> List: http://www.antlr.org/mailman/listinfo/antlr-interest >> Unsubscribe: >> http://www.antlr.org/mailman/options/antlr-interest/your-email-address > > > > > > List: http://www.antlr.org/mailman/listinfo/antlr-interest Unsubscribe: http://www.antlr.org/mailman/options/antlr-interest/your-email-address -- You received this message because you are subscribed to the Google Groups "il-antlr-interest" group. To post to this group, send email to [email protected]. To unsubscribe from this group, send email to [email protected]. For more options, visit this group at http://groups.google.com/group/il-antlr-interest?hl=en.
