@Ungaretti parse introduction article has a lot of informations.
There are many tutorials for the Rebol like this. They are good but they might not work in the Red in 100% of cases.
What we need is a catalogue of examples (snippets). We need to have an ability to look for certain phrase or word (search engine). We need to know pros, cons and comparison of different techniques.
There are many tutorials for the Rebol like this. They are good but they might not work in the Red in 100% of cases.
What we need is a catalogue of examples (snippets). We need to have an ability to look for certain phrase or word (search engine). We need to know pros, cons and comparison of different techniques.
@nedzadarek Parse has a wide range of applications, from simple text processing to metaprogramming and compiler frontend construction, so there's a lot of ground to cover. Catalogue of text search and processing patterns - okay, but explaining how to build a compiler / interpreter, and comparing different approaches to construction of DSLs and general-purpose languages (which are always task and application specific) isn't that trivial.
@nedzadarek My intention is to improve the examples given for each keyword and add snippets. I also want to add three chapters: "Parse usage- Validate inputs", "Parse usage- Extracting data from text" and "Parse usage - Manipulating text", with examples for each (other suggestions welcome). Hopefully that will be enough to get a beginner going with parse.
Currently the website has 11 parse links , including the ones you mention. The current doc, not online yet, has 15, but among them I could not find a simple good example for the
Currently the website has 11 parse links , including the ones you mention. The current doc, not online yet, has 15, but among them I could not find a simple good example for the
if keyword, for example. I got examples for that today here at gitter, btw.
@9214 yes, for bigger things it's better to write a bigger article.
@Ungaretti Certain feature lacks official documentation. Some feature require you to know some terms. I agree - it's not always beginner-friendly. Good luck documenting this 3 chapters. As I tried I know that extracting might be a lot harder/different. Manipulating series might be dangerous so I would say it's "advanced" (beginner+) level.
ps. you can manipulate any series, not only text.
@Ungaretti Certain feature lacks official documentation. Some feature require you to know some terms. I agree - it's not always beginner-friendly. Good luck documenting this 3 chapters. As I tried I know that extracting might be a lot harder/different. Manipulating series might be dangerous so I would say it's "advanced" (beginner+) level.
ps. you can manipulate any series, not only text.
What is the right way to refresh text-list face?
mylist: ["one" "two" "three"]
view [text-list data mylist [
change at face/data face/selected "hi there"
]] ; text-list is not updated when clicked
print mylist ; though underlying list isIt does not work better if I add show face
But strangely it works with face/data: face/data:
mylist: ["one" "two" "three"]
view [text-list data mylist [
change at face/data face/selected "hi there"
face/data: face/data
]] ; now text-list is updated when clicked
Not sure why it doesn't work with
show though.
...or if I unview the layout and view it again
here the new value of face/data is printed, but the face in the view is not updated:
maliste: ["un" "deux" "trois"]
view lay: layout [text-list data maliste [n: face/selected
request-text/default face/data/:n print face/data show face
]]
I have those packages installed on archlinux
core/lzo 2.10-1 [installed]
core/openssl 1.1.1-1 [installed]
core/openssl-1.0 1.0.2.p-1 [installed]
extra/flac 1.3.2-1 [installed]
extra/wavpack 5.1.0-2 [installed]
community/mbedtls 2.13.0-1 [installed]
multilib/lib32-openssl 1:1.1.1-1 [installed]
core/curl 7.61.1-1 [installed]
community/gambas3-gb-net-curl 3.11.3-3 (gambas3) [installed]
community/libcurl-compat 7.61.1-1 [installed]
community/libcurl-gnutls 7.61.1-1 [installed]
multilib/lib32-curl 7.61.1-1 [installed]
multilib/lib32-libcurl-gnutls 7.61.1-1 [installed]However, i keep getting segfaults whenever i try reading a webpage from red repl?
@Palaing this suggests that faces are not deep reactors, and do not react to changes in series (e.g.
reverse face/data). They will propagate a change only if you modify one of its facets directly, like face/data: ....
@rebolek just calling read, read/info on any url
I want to create an event that will save the contents of
How should I do that?
mytext into a file when I'm changing into another tab in tab-panelHow should I do that?
Red [needs: view]
words-as-string: read %words.txt
view [
Title "Tab-panels"
tab-panel 200x100 [
"Tab 1 " [text "First panel"]
"Tab 2 " [mytext: area 440x215 words-as-string]
]
]
on-selectevent also fires on every character typed inside text area but in addition to that also on each mouse click inside text area.I want to have the ability to automatically save content inside
mytext into a file when user will swap to another tab but I want to avoid saving on each keystroke. Red [needs: view]
words-as-string: read %words.txt
view [
Title "Tab-panels"
tab-panel 200x100 on-select [print ["swapped to tab " event/picked]] [
"Tab 1 " [text "First panel"]
"Tab 2 " [mytext: area 440x215 words-as-string]
]
]
@vejitatoja I think you can check
event/picked and save to file depending on that value, something like this:save-my-text: func [a] [
; just print `text`
probe a/text
]
view [
size 400x400
Title "Tab-panels"
tab-panel [
"Tab 1 " [text "First panel" area]
"Tab 2 " [mytext: area 440x215 return area]
] on-change [
if all [
event/picked <> 0 ; 0 = selection of non-tab (as fair I can see - no proof!)
event/picked <> 2 ; 2 is your tab with `mytext` you don't want to save it
][
save-my-text mytext probe event/picked
]
]
]
@vejitatoja
view [
Title "Tab-panels"
tab-panel 200x100 on-change [print ["face/selected:" face/selected "event/picked:" event/picked]] [
"Tab 1 " [text "First panel"]
"Tab 2 " [mytext: area 440x215 "Lorem ipsum dolor sit amet, consectetur adipiscing elit." on-change ['done]]
]
]
Another approach is to see if the tab panel is the actual face getting the event.
view [
Title "Tab-panels"
tp: tab-panel 200x100 [
"Tab 1 " [text "First panel"]
"Tab 2 " [mytext: area 440x215 words-as-string]
] on-change [
if event/face = tp [
print ["real tab event" "swapped to tab " event/picked]
]
]
]
If we can dupe the
on-select issue, we can file it as a regression. I think there have been some changes there, with panel dragging being fixed up.
@toomasv Thanks, Your solution works on the current build. If i understand correctly second
on-change that is added for area overrides the top level one? The only issue is that it would mean that i would need to add on-select ['done] to all of the faces that are children of tab-panel.
@GiuseppeChillemi
is /:ind the same of /(ind) ?
Not exactly. ind in the in the :ind is a word - it is a final value, that you want to look for in the series. (...) is a paren! - you can compute "final value" here. Examples:
arr: [a 11 "b" 22]
ind: 'a
arr/:ind
arr/(ind)
arr/('a)
arr/a
ind: "b"
arr/:ind
arr/(ind)
arr/(back tail "cb")
IN REBOL:
>> probe arr/:ind
** Script Error: Invalid path value: a
** Where: halt-view
** Near: probe arr/:ind
>> probe arr/(ind)
11
== 11