[REBOL] Re: serious proposition...WAS: RE: Standards
From: andrew:martin:colenso:school at: 24-Dec-2003 22:45
Max wrote:
> I'd like an OFFICIAL, community blessed library/module standard.
A lot of us are still waiting for Carl's module standard to arrive. I've
given up on the idea of waiting, though I can see how useful it would
be.
Max, can you give an example of your proposed library module, please?
Perhaps for a function that depends upon the presence of another
function (or word definition)?
Here's my example of 'Address and the word ('HTML_Obfuscate) that
'Address relies upon:
[
Rebol [
Name: 'Address
Title: "Address"
File: %"Address.r"
Author: "A J Martin"
Owner: "Aztecnology"
Rights: "Copyright (c) 2003 A J Martin, Aztecnology."
eMail: [Rebol--orcon--net--nz]
Web: http://www.rebol.it/Valley/
Needs: [%HTML_Obfuscate.r]
Tabs: 4
Purpose: {
Writes ML dialect for current script's File, Date &
Version,
along with the script's Author, email and web address.
}
Language: 'English
Date: 19/July/2003
Version: 2.7.2
]
Address: has [File Date Version] [
File: Rebol/script/header/File
Date: Rebol/script/header/Date
Version: Rebol/script/header/Version
compose/deep [
div/class "Address" [
address [
(rejoin ["Script: " File "; Date: " Date
; Version:
Version "; "])
"Author: " a/href/title (
rejoin [
"mailto:" HTML_Obfuscate
Rebol/script/header/eMail
"?subject="
"Script: " replace mold
File #"%" "%25"
"; Date: " Date
"; Version: " Version
#"."
]
) "Send email about this script
to the author" (Rebol/script/header/Author)
"; "
"Web: " a/href/title
(Rebol/script/header/Web)
"Go to the author's web site"
(Rebol/script/header/Web) #"."
br
]
]
]
]
]
[
Rebol [
Name: 'HTML_Obfuscate
Title: "HTML_Obfuscate"
File: %"HTML_Obfuscate.r"
Author: "A J Martin"
Owner: "Aztecnology"
Rights: "Copyright (c) 2003 A J Martin, Aztecnology."
eMail: [Rebol--orcon--net--nz]
Web: http://www.rebol.it/Valley/
Tabs: 4
Purpose: {Obscures text by converting characters into HTML
entities.}
Language: 'English
Acknowledgements: "Brian Hawley"
Date: 17/July/2003
Version: 2.0.8
]
HTML_Obfuscate: function [Plain [string! email!]] [Out] [
Out: make string! 6 * length? Plain
foreach C Plain [
C: to-integer C
Out: insert Out reduce [
"&#" any [
if C < 10 ["00"]
if C < 100 [#"0"]
""
]
C #";"
]
]
head Out
]
]
The nice part is that my library script, %Values.r, loads each script in
the library directory, %Values/, and interprets the 'Needs block. If
%Values.r finds a file! value, it loads that script (and checks the
'Needs block, recursively), before 'do-ing the first script.
This system has the advantage that I can simply copy any library script
that I like into the %Values.r directory and it runs when any version of
Rebol is launched. (I've got the line: do %/C/Rebol/Values/Values.r in
my %User.r file.)
I've recently realised that there's some disadvantages in the above
system in that it's file-centric, instead of word-centric. That is, the
'Needs field refers to file! values rather than word! values. It also
lacks a way of describing what words are given values to by each
library/values script; in other words, the above needs a 'Provides (or
similar word) name-value in the header.
For example, my %Dir.r script has this content:
CD: :change-dir
LD: :list-dir
MD: :make-dir
WD: :what-dir
There should really be a Provides in the header like:
Provides: [CD LD MD WD]
And for my first library script: %"Address.r", like:
Provides: [Address]
Needs: [HTML_Obfuscate]
With this change, I can then have my library script automatically check
the library directory and create one script file with all the library
functions on it, to maximise the OS caching of files and to speed
Rebol's interpretation of the startup script by processing only one file
instead of dozens of files.
If I were to use any other library manager, it would have be as simple
to use as the above.
I'd like to know more about your module system.
Andrew J Martin
Attendance Officer
Speaking in tongues and performing miracles.
Colenso High School
Arnold Street, Napier.
Tel: 64-6-8310180 ext 826
Fax: 64-6-8336759
http://colenso.net/scripts/Wiki.r?AJM
http://www.colenso.school.nz/
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