Mailing List Archive: 49091 messages
  • Home
  • Script library
  • AltME Archive
  • Mailing list
  • Articles Index
  • Site search

[REBOL] Re: Generating words and global variable space

From: dankelg8:cs:man:ac at: 22-Mar-2001 15:58

On Thu, 22 Mar 2001, Vos, Doug wrote:
> Why do you want to generate all the new words? > Why not use blocks or objects? > > I have thousands of lines of rebol script and > rarely use more than 3 or 4 global words per script. > > I mostly use local words and global objects. > > Can you explain more what you are trying to do? > Then I'm sure people will be able to help...
OK. :) First, as Michael pointed out, it doesn't matter where you define a word, it will be added to System/words when it is first encountered by Rebol. I'm writing a simple Prolog interpreter where the format of the rules are like this: [[father 'Bill 'Bob]] [[mother 'Ann 'Bob]] [[parent x y] [father x y]] [[parent x y] [mother x y]] [[grandparent x y] [parent x z] [parent z y]] And so on. Variables must be renamed before unification to aviod name clashes. For example, [[parent x y] [father x y]] could become [[parent _x20 _y15] [father _x20 _y15]] In deep search trees, I quickly run out of variables. There are ways to solve it, but it would make the algorithm slower. Since it's not enormously efficient at the moment, I thought I'd check if there were any other way. Gisle