Re: [xsl] 1st previous node()

["Imsieke, Gerrit, le-tex" <gerrit.imsieke@xxxxxxxxx>]

On 2011-02-08 07:16, Karl Stubsjoen wrote:
> XSL1.0
> I need help finding the first previous node, skipping white space,
> comments, etc.. I thought this might work, but I can't get it or
> similar tries to work.
>
> <xsl:variable name="previous" select="preceding::node()
>     [not(comment())]
>     [not(text())]
>     [not(processing-instruction())]
>     [1]"/>

This can be written as

    <xsl:variable name="previous" select="preceding::node()
       [not(child::comment())]
       [not(child::text())]
       [not(child::processing-instruction())]
       [1]"/>

which will select the text node immediately preceding X.

So you could write

    <xsl:variable name="previous" select="preceding::node()
       [not(self::comment())]
       [not(self::text())]
       [not(self::processing-instruction())]
       [1]"/>

which will yield

<M>
   <?skip me?>
   <!--skip me-->
  </M>

for the first example and nothing in the second (since X doesn't have a 
preceding element: an element has to be closed before X starts in order 
to qualify as preceding).

But as Patrick points out, this can of course be written as

    <xsl:variable name="previous" select="preceding::*[1]"/>

You can get M in the first case and B in the second by declaring

    <xsl:variable name="previous" select="(preceding-sibling::*[1], 
..)[1]" />

which selects the immediately preceding sibling or, if there is no 
preceding sibling, the parent element.

-Gerrit

> Given that<X>  is the context node then I expect the previous node is<M>.
>
> <A>
>   <M>
>     <?skip me?>
>     <!--skip me-->
>    </M>
>    <X>  this is context node</X>
> </A>
>
> Given that<X>  is the context node then I expect the previous node is<B>.
>
> <A>
>   <B>
>    <X>  this is context node</X>
>   </B>
> </A>
>
>
>
> --
> Karl Stubsjoen
> MeetScoresOnline.com
> (602) 845-0006

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