Hi Alex, > (setq x st1) > (setq x~sym1 5) > (print sym1 x~sym1 st1~sym1) # => NIL 5 5
great, it does what I was after! >> How can I create a new empty symbol table? > > This is easy. Just initialize it with an empty cons pair: > > (setq st1 (cons)) > > However, I just didn't want to support this on the API level (in the > 'syntax' function), because this is a very dangerous operation. If you > should happen to set such an empty namespace to "current", you are > lost, as no symbol at all will be accessible any longer. You have no > other choice than to enter Ctrl-D ;-) Good point. >> How do I refer to a symbol table without making it the default one? > > Just the normal way, as a symbol. You can manipulate namespaces > manually any way you like, as they are simply pairs of 'idx' trees. OK. I think the difference from traditional approach in other languages is that the namespace must be "visible" in the current namespace. > I don't see any problem. Here how this could be done (note that I use > the convention to save and restore the current namespace in each > module. This allows to load each module in arbitrary contexts): Yes, I was pointing out a problem to avoid which is not an issue with your implementation:-D Also, as we discussed on IRC, it would be nice to have the namespace name displayed in the repl prompt, e.g. via customizable prompt function as you suggested. Cheers, Tomas -- UNSUBSCRIBE: mailto:picolisp@software-lab.de?subject=Unsubscribe
