Re: [Texmacs-dev] DOM and TeXmacs roadmap

[Immanuel Normann]

David Allouche wrote:

> DOM level 1:
>
>  Structure navigation: can be implemented quite easily using a
>    SXML-like approach to the STM (Scheme TeXmacs) document
>    representation. All STM documents can trivially be considered SXML
>    documents.
>  
The SXML project has attrackted me since while. Now I am interested 
about your experience with SXML in TeXmacs. Is there some experimental 
code around where manipulate the STM with some SXSLT for instance?

>  Document manipulation/content manipulation: can be implemented in
>    the current framework, the current work on converters and generic
>    structural operators makes it a active field at the moment. One
>    important (and currently unsolved) problem is the duality between
>    the relatively static (but easy to use) STM document manipulation
>    and the more complex (but more dynamic) manipulation of live data
>    in editors. I will have a look at the DOM spec to help me in my
>    quest for enlightenment.
What is your precise notion of "dynamic manipulation of life data"?

> DOM level 2:
>
>
>  Range model: TeXmacs has a "marker" facility which allows for
>    position markers which are robust when the document tree is
>    modified. So this part of DOM might be partly implemented. The
>    "range of text rather than subtree of nodes" concept is not
>    planned to be a core feature but it might be implemented as a high
>    level library.
>  
How do I get and set those markers in Scheme?

> > How can I access nodes of the document tree?
> >    
>
> Two ways:
>
>  Using STM:
>
>    (tree->object (the-buffer))
>      gives you the STM representation of the current buffer text.
>
>    (tm-assign '() (object->tree x))
>      sets the current buffer from the STM data in x.
It is quite fun to manipulate the STM with some Scheme functions and 
display it with

(tm-assign '() (object->tree x))

Though I can see a result i do not understand 'tm-assign'. I tried to grep the 
definition of it, but I could not find it. What is the use of the first 
parameter '()?
I couldn't find the definitions of 'tree->object' and 'object->tree' either :-(

Eventually I come back with my original question: "How can I access nodes of the 
document tree?"
Perhaps I didn't understand your answer correctly, but my understanding is that 
I have to take the whole tree, manipulate it and send it back as a whole. So 
isn't it possible to set a subtree of the current buffer?



>  Note: in the next monthes, texmacs should be modified to support
>  HTML form, this will require putting GUI items inside the document.
>  Also, Joris plans to remove the distinction between document tree
>  and GUI tree, so the EventListener feature might become a reality
>  soon.
>  
I am really looking forward to that :-)

--
Immanuel