Kevin Flynn wrote: > Unless I have misunderstood the question, I think you'll find you can do > what you what you want to do with Xpath (although Hussein's extension may > well be faster). Try the following: > > <command name="getNodePosition"> > <macro> > <sequence> > <get expression="name($selected)"/> > <get context="$selected" > expression="count(preceding-sibling::%_)+1"/> > <command name="alert" parameter="position=%_"/> > </sequence> > </macro> > </command> > > Kevin Flynn > Birdstep Technology ASA > Oslo, Norway
Brilliant! Your solution is both simple and fast. (count(preceding-sibling::%_)) is fast.) I must confess that I'm not an XPath expert and therefore I tend to forget about the preceding-sibling axis. > -----Original Message----- > From: xmleditor-support-bounces at xmlmind.com > [mailto:xmleditor-support-bounces at xmlmind.com] On Behalf Of Philip Nye > Sent: 15. desember 2005 18:04 > To: xmleditor-support at xmlmind.com > Subject: Re: [XXE] Finding a node position > > Thanks very much Hussein. > > In the meantime I had written this pair of macros which use recursion to > calculate a result but I am sure your extension is way more efficient! > > Philip Nye > > <command name="getNodePosition"> > <macro> > <sequence> > <get expression="name($selected)"/> > <command name="countPosition" parameter="%_ 1"/> > </sequence> > </macro> > </command> > > <command name="countPosition"> > <macro> > <choice> > <sequence> > <command name="selectNode" parameter="preceding %0"/> > <get expression="string(%1 + 1)"/> > <command name="countPosition" parameter="%0 %_"/> > </sequence> > <get expression="%1"/> > </choice> > </macro> > </command> > > > > Hussein Shafie wrote: >>Philip Nye wrote: >> >>>I am trying to build a macro around callouts and <co> elements. >>> >>>Given a selected <co> node, what Xpath expression can I use to >>>calculate what its position (rank) is within the parent element? The >>>result should be the same number that the docbook stylesheet returns >>>for its >>>counter(n) field. >>> >>>Have I have missed something obvious? >> >>To my knowledge, there is no XPath function which could give you such > rank. >>That's why, a few months ago, I've written an extension function for >>one of our customers. >> >>Extension.java: >>--- >>import com.xmlmind.xmledit.doc.XNode; >>import com.xmlmind.xmledit.xpath.EvalException; >>import com.xmlmind.xmledit.xpath.NodeIterator; >> >>public final class Extension { >> public static int indexOfNode(NodeIterator nodeSet, >> NodeIterator node) { >> int index = 0; >> >> try { >> XNode n = node.next(); >> >> for (;;) { >> XNode nn = nodeSet.next(); >> if (nn == null || nn == n) >> break; >> >> ++index; >> } >> } catch (EvalException ignored) {} >> >> return index; >> } >>} >>--- >> >>To use it: >> >>[1] Copy the attached jar to one of the addon/ directories (or any >>subdirectory) scanned by XXE during its startup. >> >>[2] Declare the namespace in the file containing the macro as follows: >>--- >>xmlns:ext="java:Extension" >>--- >> >>[3] Use it in the <get> element of a <macro>. Example of use (not >>related to your precise need): >>--- >>1+ext:indexOfNode(//para, $selectedElement) >>--- >> >> >>---------------------------------------------------------------------- >>-- >> >>import com.xmlmind.xmledit.doc.XNode; >>import com.xmlmind.xmledit.xpath.EvalException; >>import com.xmlmind.xmledit.xpath.NodeIterator; >> >>public final class Extension { >> public static int indexOfNode(NodeIterator nodeSet, >> NodeIterator node) { >> int index = 0; >> >> try { >> XNode n = node.next(); >> >> for (;;) { >> XNode nn = nodeSet.next(); >> if (nn == null || nn == n) >> break; >> >> ++index; >> } >> } catch (EvalException ignored) {} >> >> return index; >> } >>}
