[REBOL] Re: steel... update... of the week (for more advanced rebolers)
From: g:santilli:tiscalinet:it at: 28-Jun-2003 10:03
Hi Maxim,
On Saturday, June 28, 2003, 12:43:57 AM, you wrote:
MOA> But I sorely miss some aspects like private methods and
MOA> members which, are most usefull (I find) when developping
MOA> frameworks, api, and tools.
The nice thing about REBOL is that you can add them yourself to
the language. :-)
MOA> aren't custom types just in the sdk?
Nope, they're an hack of mines (with help from Ladislav and
Romano). ;-) You can find it both on:
http://www.compkarori.com/vanilla/
and:
http://www.rebol.it/giesse/custom-types.r
http://www.rebol.it/giesse/complex.r
complex.r implements the complex! custom type. WARNING: just an
hack, undocumented, etc. etc.
Feel free to ask me about how it works etc.
MOA> last-arg-used: my-facet-word-function args
MOA> new-offset: find vid-spec last-arg-used?
It does something like:
new-offset: next my-facet-word-function args
Let me see if I can find the real code...
Ok, inside LAYOUT you have:
new: select styles value
if not new [error "Unknown word or style:" value break]
set [specs facets] do-facets specs new/words styles
new: make new either val: select facets 'with [expand-specs new val] [[]]
if :var [set :var new new/var: to-word :var var: none]
new/style: value
new/pane-size: pane-size
new/styles: styles
new/flags: exclude new/flags state-flags
if not flag-face? new fixed [new/offset: where]
grow-facets new facets
With DO-FACETS and GROW-FACETS being:
do-facets: func [
{Build block of parameters (and attribute words) while not a vid word or style.}
specs words styles /local facets item
][
facets: copy []
forall specs [
item: first specs
if set-word? :item [break]
either word? :item [
if any [find vid-words item find styles item] [break]
facets: insert facets either any [
all [words find words item]
all [find facet-words item]
] [to-lit-word item] [item]
] [
facets: insert/only facets :item
]
]
reduce [specs reduce head facets]
]
grow-facets: func [new args /local pairs texts colors files blocks tmp][
new/facets: args
pairs: clear []
texts: clear ["imanXwin kludge"]
colors: clear []
files: clear []
blocks: clear []
images: clear []
forall args [
val: first args
switch/default type?/word val [
pair! [append pairs val]
integer! [append pairs val]
string! [append texts val]
tuple! [append colors val]
block! [append/only blocks val]
file! [append files val]
url! [append files val]
image! [append images val]
char! [new/keycode: val]
logic! [new/data: new/state: val]
decimal! [new/data val]
time! [new/rate: val]
word! [
any [
if all [new/words tmp: find new/words :val] [
until [function? first tmp: next tmp]
args: do first tmp new args
]
if tmp: find facet-words :val [
either 0 >= offset? tmp fw-with [
until [function? first tmp: next tmp]
args: do first tmp new args
] [
either tail? args: next args [error "Missing argument for" :val] [
set in new val either positive? offset? fw-feel tmp [
first args
] [
if first args [make any [get in new val vid-face/:val] first args]
]
]
]
]
]
]
] [
error "Unrecognized parameter:" val
]
]
new/multi/text new texts
new/multi/size new pairs
new/multi/file new files
new/multi/image new images
new/multi/color new colors
new/multi/block new blocks
]
Notice that DO-FACETS is converting "keywords" to lit-words and
then applying REDUCE to the whole block. The result is the ARGS
block that then is passed to GROW-FACETS. Here, ARGS is used in a
FORALL loop (and this is the reason for the "extra" NEXT you get);
the part that uses custom facets from face/words is:
if all [new/words tmp: find new/words :val] [
until [function? first tmp: next tmp]
args: do first tmp new args
]
MOA> And it works fine... Am I just lucky?
See above. You're just ignoring any other facet after your ATTACH.
:-)
Regards,
Gabriele.
--
Gabriele Santilli <[g--santilli--tiscalinet--it]> -- REBOL Programmer
Amigan -- AGI L'Aquila -- REB: http://web.tiscali.it/rebol/index.r
