Re: [xsl] Repeated Recursion on different parts of a tree

[Peter Doggett <ee99ppd at brunel dot ac dot uk>]

Sorry I should have explained myself better.

If I had an XML document which consisted of many nodes such as:

<register name="DATA" offset="0">
    <no_of_regs>1</no_of_regs>
    <descriptivename>Data register</descriptivename>
    <description>The ...ster.</description>
    <description>In ord..H.</description>
    <description>..Oe...</description>
    <bitfield name="DATA">
      <function>Input data.</function>
      <bitpos>0</bitpos>
      <no_of_bits>10</no_of_bits>
      <initialvalue></initialvalue>
      <accesstype>RW</accesstype>
    </bitfield>
    <bitfield name="Reserved">
      <function>Output data</function>
      <bitpos>10</bitpos>
      <no_of_bits>6</no_of_bits>
      <initialvalue>0</initialvalue>
      <accesstype>RW</accesstype>
    </bitfield>


<register name="CONTROL" offset="20">
.........

I would like to have an output document which will evaluate all of the 
<bitfield> elements for a given register, and give me an expression for 
each register, as one value. 

For example, with one case I would like in 
my output document to have an expression showing the initial value of a 
register. This is evaluated, by a simple algorithm which will shift 
each <bitfield> <initialvalue> (initial value of each individual 
bitfield) by the required <bitpos> (bit position within the register),
with all the bitfields within a simple register having to be evaluated.


So my result document might look like:

Register DATA Initial Value = X
Register CONTROL Initial Value = Y 
etc...

Now I dont have a problem with the maths involved (I am developing 
shifting and decimal to hex/binary templates).The problem is that I 
cant dynamically update a variable in XSL while traversing the tree. to 
call a recursive template would require me to keep track of which 
<bitfield> elements I have processed? 

Any Ideas?








On Wed, 25 Sep 2002 16:33:56 +0100 David Carlisle <davidc@nag.co.uk> 
wrote:

> 
> > How would I keep track of the elements I have processed? 
> 
> maybe it's just me not understanding the problem description
> but can't you just use normal tree traversal here
> 
> <xsl:apply-templates/>...
> 
> <xsl:template match="bitfield">
>  <xsl:call-template whatever recursive algorithm you wanted to do...
> 
> maybe it would help if you showed the desired output given your input
> fragment
> 
> David
> 
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----------------------
Peter Doggett
ee99ppd@brunel.ac.uk


 XSL-List info and archive:  http://www.mulberrytech.com/xsl/xsl-list