2009/3/30 john skaller <skal...@users.sourceforge.net> > > On 30/03/2009, at 10:33 PM, john skaller wrote: > > >> What would be cool is if Felix "nested grammars" could work >> efficiently. >> > > The other thing that would be useful is a way to "insert" new productions > at "priorities" between others. The obvious example is expressions where > you want to add a new operator with a precedence between others. > > Dypgen at one stage had dynamically adjustable priority relations > which would have supported this if it had worked (but it is clearly > very difficult to get right in case there are several parallel parses > running). >
The way dypgen extend the automaton has been revised early 2008. It is now very simple to add new priorities: just use their strings in new rules that need them. Making the relation true between two priorities or several at once is easy too. > > Roughly Felix would benefit from ability to add new productions by > "pushing" them onto a grammar stack, and later "forget" these productions. > > I conceive this as a purely functional operation, not a modification, > working just like "scopes" in programming languages (because that's > precisely the context in which the feature is needed :) > This is exactly how extending the grammar works with dypgen, unless I'm missing something. Emmanuel
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