* Help with xml & lua
@ 2017-08-02 15:23 Olivier Binda
2017-08-07 13:38 ` Hans Hagen
0 siblings, 1 reply; 2+ messages in thread
From: Olivier Binda @ 2017-08-02 15:23 UTC (permalink / raw)
To: ntg-context
Hello
I have been trying for the past 3 days to process files with xml on the
lua side (with Context beta 0.70), but I'm at then end of my wits and
really need help.
On the lua side, I would really like to be able to :
1) transform a tree : replace nodes with other nodes
2) transform a tree : walk it and modify node attributes
3) walk a modified tree and flush it with setups
Could someone give me hints or better yet a lua snipet that :
1) load a tree in lua
2) modify it
3) walk it
4) it can be done again
I have had some success with 1, but lost 2 days trying to make 2 & 3
work with setups
A) I managed to replace a node of an xml document with a subtree of
another xml document by doing :
-- load the main tree
local mainTree = lxml.load("mainTree", "mainFile.xml)
local replacementNode = xml.first(lxml.load("replacement",
"replacementFile.xml), somePattern)
-- replace nodes
for node in xml.collected(tree, pattern) do
node.tg ="toBeReplaced"
xml.replace(tree, "toBeReplaced", replacementNode)
end
But then I failed to walk the modified tree with setups : my setups for
"mainTree" work, but not for the inserted subtrees
B) So, to process my tree further, I need to first serialize it
-- save the modified tree
xml.save(mainTree, "saved.xml")
And then, I can reload the modified tree and work further with it (but
it sucks to have to save to reload).
C) "xml.replace" works in a weird way : it erases node (toBereplaced)
and inserts the children of replacementNode as children of the parent of
the node to be replaced...
D) I did not manage to walk a tree loaded with xml.load in lua. I know
that I have to register setups, I tried all sort of things, looked at
the Tex/Lua context source code but could not make it work. Also the xml
documentation for context on the net is really old, sparse and obsolete.
On the tex side, it works : \xmlprocessfile{mySetups}{saved.xml}{} works
like a charm
But the TeX commands don't allow you to grab a modified xml tree, once
you have walked it
E) I tried
lxml.load(id, filename)
context("\\xmlregistereddocumentsetups{" .. id .. "}{}")
Best regards,
OlivierBinda
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: Help with xml & lua
2017-08-02 15:23 Help with xml & lua Olivier Binda
@ 2017-08-07 13:38 ` Hans Hagen
0 siblings, 0 replies; 2+ messages in thread
From: Hans Hagen @ 2017-08-07 13:38 UTC (permalink / raw)
To: ntg-context
On 8/2/2017 5:23 PM, Olivier Binda wrote:
> Hello
>
> I have been trying for the past 3 days to process files with xml on the
> lua side (with Context beta 0.70), but I'm at then end of my wits and
> really need help.
>
> On the lua side, I would really like to be able to :
>
> 1) transform a tree : replace nodes with other nodes
>
> 2) transform a tree : walk it and modify node attributes
>
> 3) walk a modified tree and flush it with setups
what do you mean with 'walk with setups' ... at the lua end? setuips are
something at the tex end
> Could someone give me hints or better yet a lua snipet that :
> 1) load a tree in lua
> 2) modify it
> 3) walk it
> 4) it can be done again
in some cases you need to apply setups after adaption, eg with
\xmlregistereddocumentsetups{...}{...}
> I have had some success with 1, but lost 2 days trying to make 2 & 3
> work with setups
>
> A) I managed to replace a node of an xml document with a subtree of
> another xml document by doing :
>
> -- load the main tree
> local mainTree = lxml.load("mainTree", "mainFile.xml)
>
> local replacementNode = xml.first(lxml.load("replacement",
> "replacementFile.xml), somePattern)
>
> -- replace nodes
> for node in xml.collected(tree, pattern) do
> node.tg ="toBeReplaced"
> xml.replace(tree, "toBeReplaced", replacementNode)
> end
>
> But then I failed to walk the modified tree with setups : my setups for
> "mainTree" work, but not for the inserted subtrees
at the lua end there's lxm.include
(there's also some some indexing going on)
> B) So, to process my tree further, I need to first serialize it
>
> -- save the modified tree
>
> xml.save(mainTree, "saved.xml")
>
> And then, I can reload the modified tree and work further with it (but
> it sucks to have to save to reload).
\xmlinclude should work ok (at least it does at our end) given that you
do it before associating the setups
> C) "xml.replace" works in a weird way : it erases node (toBereplaced)
> and inserts the children of replacementNode as children of the parent of
> the node to be replaced...
>
> D) I did not manage to walk a tree loaded with xml.load in lua. I know
> that I have to register setups, I tried all sort of things, looked at
> the Tex/Lua context source code but could not make it work. Also the xml
> documentation for context on the net is really old, sparse and obsolete.
>
> On the tex side, it works : \xmlprocessfile{mySetups}{saved.xml}{} works
> like a charm
> But the TeX commands don't allow you to grab a modified xml tree, once
> you have walked it
>
> E) I tried
>
> lxml.load(id, filename)
> context("\\xmlregistereddocumentsetups{" .. id .. "}{}")
you need to provide (small) working (valid) examples
Hans
-----------------------------------------------------------------
Hans Hagen | PRAGMA ADE
Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!
maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage : http://www.pragma-ade.nl / http://context.aanhet.net
archive : https://bitbucket.org/phg/context-mirror/commits/
wiki : http://contextgarden.net
___________________________________________________________________________________
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2017-08-07 13:38 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-08-02 15:23 Help with xml & lua Olivier Binda
2017-08-07 13:38 ` Hans Hagen
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).