[XSL-LIST Mailing List Archive Home] [By Thread] [By Date]

Re: [xsl] Grouping consecutive page numbers for index (xslt 1.0)


Subject: Re: [xsl] Grouping consecutive page numbers for index (xslt 1.0)
From: Wendell Piez <wapiez@xxxxxxxxxxxxxxx>
Date: Thu, 22 Aug 2013 12:59:19 -0400

Hi,

The same, using sibling recursion (all the usual caveats apply):

   <xsl:template match="pages">
      <xsl:copy>
        <xsl:apply-templates select="page[1]"/>
      </xsl:copy>
   </xsl:template>

   <xsl:template match="page">
      <xsl:copy>
         <xsl:apply-templates select="." mode="range"/>
      </xsl:copy>
      <xsl:apply-templates select="following-sibling::page[1]" mode="next-out"/>
   </xsl:template>

   <xsl:template match="page" mode="range">
      <xsl:apply-templates/>
      <xsl:apply-templates select="following-sibling::page[1]" mode="next-in"/>
   </xsl:template>

   <xsl:template match="page[not(. = preceding-sibling::page[1] + 1)]"
mode="next-in" priority="1"/>

   <xsl:template match="page[not(. + 1 = following-sibling::page[1])]"
mode="next-in">
      <xsl:text>-</xsl:text>
      <xsl:apply-templates/>
   </xsl:template>

   <xsl:template match="page" mode="next-in">
      <xsl:apply-templates select="following-sibling::page[1]" mode="next-in"/>
   </xsl:template>

   <xsl:template match="page" mode="next-out">
      <xsl:apply-templates select="following-sibling::page[1]" mode="next-out"/>
   </xsl:template>

   <xsl:template match="page[not(. = preceding-sibling::page[1] + 1)]"
mode="next-out">
      <xsl:apply-templates select="."/>
   </xsl:template>

David's is a little shorter, but mine has more templates!

Of course, XSLT 2.0 is so much nicer --

<xsl:template match="pages">
   <xsl:copy>
      <xsl:for-each-group select="page"
group-starting-with="page[not(. = preceding-sibling::page[1] + 1)]">
         <page>
            <xsl:value-of select="current-group()[1]"/>
            <xsl:if test="exists(current-group()[2])">
               <xsl:text>-</xsl:text>
               <xsl:value-of select="current-group()[last()]"/>
            </xsl:if>
         </page>
      </xsl:for-each-group>
   </xsl:copy>
</xsl:template>

Cheers, Wendell

Wendell Piez | http://www.wendellpiez.com
XML | XSLT | electronic publishing
Eat Your Vegetables
_____oo_________o_o___ooooo____ooooooo_^


On Wed, Aug 21, 2013 at 10:29 AM, David Carlisle <davidc@xxxxxxxxx> wrote:
> On 21/08/2013 14:49, Kevin Bird wrote:
>>
>> Hello,
>>
>> Would really appreciate some guidance with the following problem.
>> I'm stuck with XSLT 1.0.
>> Any pointers as to the best approach would help.
>>
>> INPUT:
>> <pages>
>>         <page>1</page>
>>         <page>2</page>
>>         <page>3</page>
>>         <page>6</page>
>>         <page>12</page>
>>         <page>13</page>
>>         <page>14</page>
>>         <page>15</page>
>>         <page>16</page>
>> </pages>
>>
>> DESIRED OUTPUT:
>> <pages>
>>         <page>1-3</page>
>>         <page>6</page>
>>         <page>12-16</page>
>> </pages>
>>
>> Regards.
>>
>> --
>
>
>
>
> <page>1-3</page>
> <page>6</page>
> <page>12-16</page>
>
>
>
> <xsl:stylesheet version="1.0"
> xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
>
> <xsl:output indent="yes"/>
>
> <xsl:template match="pages">
> <xsl:apply-templates select="page[1]">
>  <xsl:with-param name="first" select="page[1]"/>
>  <xsl:with-param name="last" select="page[1]"/>
> </xsl:apply-templates>
> </xsl:template>
>
> <xsl:template match="page">
>  <xsl:param name="first"/>
>  <xsl:param name="last"/>
>  <xsl:choose>
>   <xsl:when test="following-sibling::page[1][.=$last+1]">
>    <xsl:apply-templates select="following-sibling::page[1][.=$last+1]">
>     <xsl:with-param name="first" select="$first"/>
>     <xsl:with-param name="last" select="$last+1"/>
>    </xsl:apply-templates>
>   </xsl:when>
>   <xsl:when test="following-sibling::page">
>    <page><xsl:if test="$first!=$last"><xsl:value-of
> select="$first"/>-</xsl:if><xsl:value-of select="$last"/></page>
>    <xsl:apply-templates select="following-sibling::page[1]">
>     <xsl:with-param name="first" select="following-sibling::page[1]"/>
>     <xsl:with-param name="last" select="following-sibling::page[1]"/>
>    </xsl:apply-templates>
>   </xsl:when>
>     <xsl:otherwise>
>    <page><xsl:if test="$first!=$last"><xsl:value-of
> select="$first"/>-</xsl:if><xsl:value-of select="$last"/></page>
>     </xsl:otherwise>
>  </xsl:choose>
> </xsl:template>
>   </xsl:stylesheet>
>
>
> David
>
>
> ________________________________________________________________________
> The Numerical Algorithms Group Ltd is a company registered in England
> and Wales with company number 1249803. The registered office is:
> Wilkinson House, Jordan Hill Road, Oxford OX2 8DR, United Kingdom.
>
> This e-mail has been scanned for all viruses by Star. The service is
> powered by MessageLabs.
> ________________________________________________________________________


Current Thread
Keywords