Hi all, one of my favorite topics… Here is a minimal example which shows something that I don't understand: when I process the subsection with the lua code, I want to get the value of the current section's "label" attribute in xml.attribute(r, "../../section", "label", "X"). So i was expecting that lua would go up (../../) and fetch the current section's label. But if you run the example, you see that it actually always gets the first section's label (value is always 1). How can I get the current section's label with a lua function? THanks and all best Thomas \startbuffer[test] <chapter> <section label="1"> <subsection label="1"> <content> text 1.1 </content> </subsection> </section> <section label="3"> <subsection label="1"> <content> text 3.1 </content> </subsection> <subsection label="5"> <content> text 3.5 </content> </subsection> </section> </chapter> \stopbuffer \startxmlsetups xml:testsetups \xmlsetsetup{\xmldocument}{chapter|section|subsection|content}{xml:*} \stopxmlsetups \xmlregistersetup{xml:testsetups} \startxmlsetups xml:chapter \xmlflush{#1} \stopxmlsetups \startxmlsetups xml:section \xmlflush{#1} \par \stopxmlsetups \startxmlsetups xml:subsection \xmlfunction{#1}{test} \stopxmlsetups \startluacode outfile = io.open('temp.tmp', 'w') function xml.functions.test(r) content = xml.text(r, "content") section = xml.attribute(r, "../../section", "label", "X") context("This ") context(content) context(" is in section ") context(section) end \stopluacode \starttext \xmlprocessbuffer{main}{test}{} \enabletrackers[context.trace] \xmlshow{main} \stoptext
On 2/26/2013 1:23 PM, Schmitz Thomas A. wrote:
Hi all,
one of my favorite topics… Here is a minimal example which shows something that I don't understand: when I process the subsection with the lua code, I want to get the value of the current section's "label" attribute in xml.attribute(r, "../../section", "label", "X"). So i was expecting that lua would go up (../../) and fetch the current section's label. But if you run the example, you see that it actually always gets the first section's label (value is always 1). How can I get the current section's label with a lua function?
you go up to the parent of sections which to far up, try: section = xml.attribute(r, "..", "label", "X") or section = xml.filter(r, "../attribute(label)")
THanks and all best
Thomas
\startbuffer[test] <chapter> <section label="1"> <subsection label="1"> <content> text 1.1 </content> </subsection> </section> <section label="3"> <subsection label="1"> <content> text 3.1 </content> </subsection> <subsection label="5"> <content> text 3.5 </content> </subsection> </section> </chapter> \stopbuffer
\startxmlsetups xml:testsetups \xmlsetsetup{\xmldocument}{chapter|section|subsection|content}{xml:*} \stopxmlsetups
\xmlregistersetup{xml:testsetups}
\startxmlsetups xml:chapter \xmlflush{#1} \stopxmlsetups
\startxmlsetups xml:section \xmlflush{#1} \par \stopxmlsetups
\startxmlsetups xml:subsection \xmlfunction{#1}{test} \stopxmlsetups
\startluacode outfile = io.open('temp.tmp', 'w') function xml.functions.test(r) content = xml.text(r, "content") section = xml.attribute(r, "../../section", "label", "X") context("This ") context(content) context(" is in section ") context(section) end \stopluacode
\starttext \xmlprocessbuffer{main}{test}{}
\enabletrackers[context.trace]
\xmlshow{main} \stoptext
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On Feb 26, 2013, at 1:54 PM, Hans Hagen
you go up to the parent of sections which to far up, try:
section = xml.attribute(r, "..", "label", "X")
or
section = xml.filter(r, "../attribute(label)")
Mojca, Hans, thanks, that is exactly right! I wasn't too sure about ../../section, but now it makes sense. I have to study xpath a bit more, I guess. All best Thomas
Hi, may I ask another question about my new favorite topic? No? Anyway: here comes. While processing xml, I would like to store the content of a node in a lua table and retrieve it later. The example is silly, but demonstrates my problem. Is there a way to have ConTeXt process and typeset the value in lines 3 and 4? As you can see, it typesets the raw xml instead of processing it. (I suspect I'm still a bit lost regarding the difference between xml... and lxml... functions, but I couldn't hit the right combination here). Thanks, and all best Thomas \startbuffer[test] <a> <b><c>Fruit</c> <d><e>Apple</e></d></b> <b><c>Vegetable</c> <d><q>Carot</q></d></b> <b><c>Fruit</c></b> <b><c>Vegetable</c></b> </a> \stopbuffer \startxmlsetups xml:testsetups \xmlsetsetup{\xmldocument}{a|b|c|d}{xml:*} \stopxmlsetups \xmlregistersetup{xml:testsetups} \startxmlsetups xml:a \xmlflush{#1} \stopxmlsetups \startxmlsetups xml:b \xmlfunction{#1}{lookup} \par \stopxmlsetups \startxmlsetups xml:e {\bgroup\em \xmlflush{#1}\egroup} \stopxmlsetups \startxmlsetups xml:q \quotation{\xmlflush{#1}} \stopxmlsetups \startluacode lookuptable = { } function xml.functions.lookup(t) mytype = xml.text(t, "c") myvalue = xml.text(t, "d") if not lookuptable[mytype] then context("New Type: ") context(mytype) context("; its value is: ") lxml.text(t, "d") lookuptable[mytype] = mytype .. " = " .. myvalue else context("This Type is already known: ") context(lookuptable[mytype]) end end \stopluacode \starttext \xmlprocessbuffer{main}{test}{} \stoptext
On 3/5/2013 9:47 AM, Thomas A. Schmitz wrote:
Hi,
may I ask another question about my new favorite topic? No? Anyway: here comes. While processing xml, I would like to store the content of a node in a lua table and retrieve it later. The example is silly, but demonstrates my problem. Is there a way to have ConTeXt process and typeset the value in lines 3 and 4? As you can see, it typesets the raw xml instead of processing it. (I suspect I'm still a bit lost regarding the difference between xml... and lxml... functions, but I couldn't hit the right combination here).
lookuptable[mytype] = mytype .. " = " .. myvalue inspect(lookuptable) the .. triggers a tostring on myvalue which in turn serializes the xml lookuptable[mytype] = { mytype = myvalue } would keep myvalue as xml node
Thanks, and all best
Thomas
\startbuffer[test] <a> <b><c>Fruit</c> <d><e>Apple</e></d></b> <b><c>Vegetable</c> <d><q>Carot</q></d></b> <b><c>Fruit</c></b> <b><c>Vegetable</c></b> </a> \stopbuffer
\startxmlsetups xml:testsetups \xmlsetsetup{\xmldocument}{a|b|c|d}{xml:*} \stopxmlsetups
\xmlregistersetup{xml:testsetups}
\startxmlsetups xml:a \xmlflush{#1} \stopxmlsetups
\startxmlsetups xml:b \xmlfunction{#1}{lookup} \par \stopxmlsetups
\startxmlsetups xml:e {\bgroup\em \xmlflush{#1}\egroup} \stopxmlsetups
\startxmlsetups xml:q \quotation{\xmlflush{#1}} \stopxmlsetups
\startluacode lookuptable = { } function xml.functions.lookup(t) mytype = xml.text(t, "c") myvalue = xml.text(t, "d") if not lookuptable[mytype] then context("New Type: ") context(mytype) context("; its value is: ") lxml.text(t, "d") lookuptable[mytype] = mytype .. " = " .. myvalue else context("This Type is already known: ") context(lookuptable[mytype]) end end \stopluacode
\starttext \xmlprocessbuffer{main}{test}{}
\stoptext ___________________________________________________________________________________
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://tex.aanhet.net archive : http://foundry.supelec.fr/projects/contextrev/ wiki : http://contextgarden.net ___________________________________________________________________________________
-- ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
On 03/05/2013 09:58 AM, Hans Hagen wrote:
lookuptable[mytype] = mytype .. " = " .. myvalue inspect(lookuptable)
the .. triggers a tostring on myvalue which in turn serializes the xml
lookuptable[mytype] = { mytype = myvalue }
would keep myvalue as xml node
Hans, thanks a lot, the explanation makes sense, but your suggestion is not yet clear enough for me: how would I then process the node? context(lookuptable[mytype]["mytype"]) gives again the serialized xml. Thomas
On 3/5/2013 10:16 AM, Thomas A. Schmitz wrote:
On 03/05/2013 09:58 AM, Hans Hagen wrote:
lookuptable[mytype] = mytype .. " = " .. myvalue inspect(lookuptable)
the .. triggers a tostring on myvalue which in turn serializes the xml
lookuptable[mytype] = { mytype = myvalue }
would keep myvalue as xml node
Hans, thanks a lot, the explanation makes sense, but your suggestion is not yet clear enough for me: how would I then process the node?
context(lookuptable[mytype]["mytype"])
gives again the serialized xml.
\startluacode local lookuptable = { } function xml.functions.lookup(t) local mytype = xml.text(t, "c") local myvalue = lookuptable[mytype] if not myvalue then myvalue = xml.first(t, "d") lookuptable[mytype] = myvalue context("registered: ") else context("reused: ") end -- each found node gets an id lxml.flush(lxml.id(myvalue)) context(" or ") -- in tex mode a to-tex serializer is the default xml.cprint(myvalue) end \stopluacode One place to look for tricks is in x-mathml.mkiv / lua (I know, I should finish that manual). Hans ----------------------------------------------------------------- Hans Hagen | PRAGMA ADE Ridderstraat 27 | 8061 GH Hasselt | The Netherlands tel: 038 477 53 69 | voip: 087 875 68 74 | www.pragma-ade.com | www.pragma-pod.nl -----------------------------------------------------------------
On 03/05/2013 11:11 AM, Hans Hagen wrote:
\startluacode local lookuptable = { } function xml.functions.lookup(t) local mytype = xml.text(t, "c") local myvalue = lookuptable[mytype] if not myvalue then myvalue = xml.first(t, "d") lookuptable[mytype] = myvalue context("registered: ") else context("reused: ") end -- each found node gets an id lxml.flush(lxml.id(myvalue)) context(" or ") -- in tex mode a to-tex serializer is the default xml.cprint(myvalue) end \stopluacode
One place to look for tricks is in x-mathml.mkiv / lua (I know, I should finish that manual).
Hans
Beautiful! Thanks a lot, that's just what I needed. And yes, in the medium-to-long run, finishing the manual will save you from being pestered with my questions... :-) Thomas
participants (3)
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Schmitz Thomas A. -
Thomas A. Schmitz