Hello Group,
Nice quiz James!
I refreshed and added to my lisp knowledge and had fun with adventure.
I did a one to one translation from the lisp code to ruby code. I used
a similar user interface targeting irb as proposed.
Using a method_missing hack I allowed things like
pickup bottle
or even
splash bottle frog
to work.
Then I rewrote the whole thing in ruby style using a readline
interface and adding some capabilities. I think it came out quite nice
and I juggled a lot with meta programming concepts. So thanks to all
the helpfull people here on the list I have learned a lot this week.
The solution can be found and browsed at
http://ruby.brian-schroeder.de/quiz/adventure/
best regards,
Brian
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Brian Schröder:
...
or even
splash bottle frog
to work.
Then I rewrote the whole thing in ruby style using a readline
interface and adding some capabilities. I think it came out quite nice
and I juggled a lot with meta programming concepts. So thanks to all
the helpfull people here on the list I have learned a lot this week.
I've enjoyed reading both versions of your code. It looks a lot more
comfortable than my attempts at retaining the LISP code's semantics.
The define_game_action method is particularly interesting: using "subject,
object = *args.flatten" to un-collect arguments from a passed array (built
by a magic method-missing) is cool. The coolest bit, though, is passing the
parameter (local) variable action to instance_eval inside the define_method
block. I don't quite get how that works; if you read my code, you'll see I
defined that function into a separate method. I thought methods were banned
from accessing local variables from outside their scope - this one seems to
be staying in like in a closure.
I'm glad to see evidence in the "Eval and block problems" thread that it's
harder than it looks for other people, too 
Cheers,
Dave
define_method() builds a method from the provided block and all Ruby blocks are closures. That's why it behaves differently, I think.
James Edward Gray II
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On Oct 5, 2005, at 10:36 AM, Dave Burt wrote:
The coolest bit, though, is passing the parameter (local) variable action to instance_eval inside the define_method block. I don't quite get how that works; if you read my code, you'll see I
defined that function into a separate method. I thought methods were banned from accessing local variables from outside their scope - this one seems to be staying in like in a closure.