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Re: Counting number of characters of sibling text node

Subject: Re: Counting number of characters of sibling text node
From: Dimitre Novatchev <dnovatchev@xxxxxxxxx>
Date: Wed, 22 May 2002 06:30:17 -0700 (PDT)
xsl test number of characters
> What I want to do is to count the number os characters in a  text 
> node and all previous text nodes children of the current text node's
> parent.
>            parent
>               |
>   ----------------------------
>   |        |        |         |
> text1 <br/>  text2  <br/>
>   When having text1 has the current node my template would return the
> number of characters of text1 but when having text2 has the current 
> node my template would return the sum of number of characters of 
> text1 with number of characters of text2.
>   I've tried using the following template:
> <xsl:template match="text()" mode="getStrLen">
>    <xsl:variable name="pastTxtLen"><xsl:apply-templates 
> select="preceding-sibling::text()[1]" 
> mode="getStrLen"/></xsl:variable>
>    <xsl:value-of select="string-length($pastTxtLen) + string-length
> (.)" />
> </xsl:template>
> I get it's result by doing: 
> <xsl:variable name="pastTxtLen"><xsl:apply-templates select="." 
> mode="getStrLen"/></xsl:variable>
> Doing it this way I get the rong result.
> For the example above, when I have text1 has the current node it 
> works fine(the number of characters of text1 only is returned) but 
> when I have text2 has the current node a rong result.
>    Any suggestions?

You're almost there, just two things:

1. Change 

>    <xsl:value-of select="string-length($pastTxtLen) + string-length
> (.)" />


    <xsl:value-of select="$pastTxtLen + string-length(.)" />

2. In case there are no preceding siblings that are text nodes, the
value of $pastTxtLen will be the empty nodeset, which is not a number.
As a result you'll get NaN adding to it anything. Therefore, you need
to process this special case in an appropriate way.

Here's one solution:

<xsl:stylesheet version="1.0" 
 <xsl:output omit-xml-declaration="yes"/>
 <xsl:strip-space elements="*"/>
  <xsl:template match="/">

    <xsl:for-each select="/t/text()">
      <xsl:apply-templates select="." mode="getStrLen"/>
  <xsl:template match="text()" mode="getStrLen">
    <xsl:variable name="vPrecText" 
    <xsl:variable name="pastTxtLen">
        <xsl:when test="$vPrecText">
          <xsl:apply-templates mode="getStrLen"
               select="$vPrecText[1]" />
    <xsl:value-of select="$pastTxtLen + string-length(.)" />

source xml:


Dimitre Novatchev.

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