Is smartness the problem?

Newsgroups	comp.lang.forth
From	Albert van der Horst <albert@spenarnc.xs4all.nl>
Subject	Is smartness the problem?
Date	2012-07-14 12:22 +0000
Message-ID	<m75h1o.ide@spenarnc.xs4all.nl> (permalink)
Organization	Dutch Forth Workshop

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Recently we had a discussion about formatting.
The basic idea is:

AVAILABLE "HOST" GET-ENV
"The computer %s has %d bytes available"  FORMAT&TYPE

What FORMAT&TYPE does is
1. split at the % , collect first part
2. identify a word e.g. s , use it as a formatter
3. EXECUTE s , which gives a string, collect that string
4. repeat at step 1 until format string exhausted
5. TYPE the string thus collected

Similarly we have FORMAT&EVAL

We make a wordlist with formatters s and d.

Alternative implementations are now
1. once you find the string  "s" or "d"  evaluate it
   with the formatters at the top of the search order.
2. Use SEARCH-WORD-LIST and EXECUTE

I've been bitten hard by a problem caused by using 1
and the existance of STATE. There is no smart
word in sight, but it smells the same.

I want to add the phrase
" ^%s @ %d  +" to a method definition, where at %s
the name of the class is to be filled in and at %d
the offset of the field where the method is supposed to
work.
The string e.g. "^VECTOR @  4 + " has to be evaluated in
compilation mode.

However I got the string "^ @ +". It took me some time
to realize that evaluating "s" in compilation mode,
merely added s to the current definition, and did nothing
to end up in the collected string.

So, I wonder what wise lessons concerning STATE I missed
to get into this trouble.

(I solve this by method 2 and using a lightweight
SEARCH-WORDLIST . My two screen mini-objects is now
a one screen mini-objects plus a one screen formatter, which
is independantly useful.
An alternative is stacking STATE and switching to execution
mode. )

Groetjes Albert



--
-- 
Albert van der Horst, UTRECHT,THE NETHERLANDS
Economic growth -- being exponential -- ultimately falters.
albert@spe&ar&c.xs4all.nl &=n http://home.hccnet.nl/a.w.m.van.der.horst

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Is smartness the problem? Albert van der Horst <albert@spenarnc.xs4all.nl> - 2012-07-14 12:22 +0000
  Re: Is smartness the problem? anton@mips.complang.tuwien.ac.at (Anton Ertl) - 2012-07-14 11:53 +0000
  Re: Is smartness the problem? Bernd Paysan <bernd.paysan@gmx.de> - 2012-07-14 15:26 +0200

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