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words&context was: (Re: Update)

 [1/4] from: cyphre:volny:cz at: 25-May-2001 10:46

Hi Ladislav and all, Your docs are very interesting. Since I haven't study them detailed yet I would like show you my problem regarding contexts because it seems you have better experience in exploration of this field... I'm still trying to find a solution for adding/setting a new word to context without using 'make and here are some of my findings:
>> a: make object! [b: 5] >> probe a/self
make object! [ b: 5 ]
>> a/self: make a/self [b: 8 c: 10] >> a/c
** Script Error: Invalid path value: c ** Near: a/c
>> a/b
== 5
>> a/self/b
== 8
>> a/self/c
== 10
>> probe a/self
make object! [ b: 8 c: 10 ]
>> probe a
make object! [ b: 5 ]
seems like 'self doesnot work dynamically...bug or feature? In this example you can see how is crating of new words in specified context agressive. I hope we will need another method for adding new words. Without this is not possible to make modular software... Here is example for better explanation: ModuleA: make object! [...] ModuleB: make object! [...] main-script: make object! [ ....blablabla... ] How can I insert modules A and/or B into main-script(I really don't need them in global context)?? another example of using creatinon new words in specified context is even more difficult: in this example I want to display on screen different faces for example including some tables...I also need to add new table to screen. screen: make face [ table1: make face [...] table2: make face [...] pane: [table1 table2] ] view l: layout [ bx: box with [pane: sceeen] button "add table3" [ screen: make screen [ table3: make face [...] ] append screen/pane in screen 'table3 show l ] ] This method doesnot work because of agressive using of 'make when adding word table3 while is face screen viewed. Maybe you could ask why I want to use this method? I want to choose this method because of easier access into tableX faces for example: screen/table2/color: blue to get all names of subfaces I just use all-table-names: copy screen/pane etc. Normally is used method where pane is a block of faces, not words reffering to faces in specified context, like: screen: make face [ pane: [make face [...] make face [...]] ] in this situation I can use just screen/pane/1 or screen/pane/2 etc. I this case I also have to know exact position in pane and need to identify panes somehow to work with them like: screen: make face [ pane: ['table1 make face [...] 'table2 make face [...]] ] this is better solution but again the acces to subfaces(tables) is more complicated than in method of using pane: [block of words] I you are understood my confused text and have any comments or solution don't hesitate to write it ;-) regards Cyphre

 [2/4] from: lmecir:mbox:vol:cz at: 29-May-2001 17:58

Hi Cyphre, there is no way how to "extend" an existing object currently. You can only simulate such behaviour, i.e. write a work-around. If you think I can help you, try to send me (possibly personally - you can use Czech language) some code you are trying to write. I am not sure I understood the meaning of your examples. Ladislav

 [3/4] from: lmecir:mbox:vol:cz at: 30-May-2001 18:26

Hi, I just corrected It contained an alias bug. Regards Ladislav

 [4/4] from: robert:muench:robertmuench at: 4-Jun-2001 11:45

> -----Original Message----- > From: [rebol-bounce--rebol--com] [mailto:[rebol-bounce--rebol--com]]On Behalf Of
<<quoted lines omitted: 4>>
> there is no way how to "extend" an existing object currently. You can only > simulate such behaviour, i.e. write a work-around.
Hi, don't know if it's still a topic for you but here is a "workaround", you are right that there is no native way to extend an object. extend-object: func ['obj-word [word!] 'word [word!] value [any-type!] /local the-obj][ all [not object? the-obj: get obj-word make error! "No object provided."] if in the-obj word [ set in the-obj word value return the-obj ] set obj-word make the-obj reduce [to-set-word word value] ] use like: extend-object objectoextend newword newvalue Robert

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