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Re: [xsl] Can group-by treat its target it two ways?

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On 5.11.2011 19:18, Mark wrote:

> However, for the archives, I ended up with this monstrosity that
> does the job (ugly as it is):

It's usually better to extract such complicated code into user defined
function for easier reuse and readability.

> <xsl:for-each-group select="Word" group-by="if
> (lower-case(substring(@word,1,1)) eq 'D
' or
> lower-case(substring(@word,1,1)) eq 'E' or
> lower-case(substring(@word,1,1)) eq 'E!' or
> lower-case(substring(@word,1,1)) eq 'E>') then
> lower-case(substring(@word,1,1)) else if
> (lower-case(substring(@word,1,2)) eq 'ch') then 'ch' else
> lower-case(substring(cps:remove-diacritics(@word), 1, 1))">

Personally, I prefer to store such exception rules (for example that
"D
" shouldn't be treated as "c") in sort of a lookup table. Something
like:

<l:letters>
  <l i="0">Symboly</l>
  <l i="1">A</l>
  <l i="1">a</l>
  <l i="1">C
</l>
  <l i="1">C!</l>
  <l i="2">B</l>
  <l i="2">b</l>
  <l i="3">C</l>
  <l i="3">c</l>
  <l i="4">D</l>
  <l i="4">D
</l>
  <l i="5">D</l>
  <l i="5">d</l>
  <l i="5">D</l>
  <l i="5">D</l>
  <l i="7">E</l>
  <l i="7">e</l>
  <l i="7">C	</l>
  <l i="7">C)</l>
  <l i="7">D</l>
  <l i="7">D</l>
  <l i="7">C</l>
  <l i="7">C+</l>
  <l i="8">F</l>
  <l i="8">f</l>
  <l i="9">G</l>
  <l i="9">g</l>
  <l i="10">H</l>
  <l i="10">h</l>
  <l i="11">Ch</l>
  <l i="11">ch</l>
  <l i="11">cH</l>
  <l i="11">CH</l>
  <l i="12">I</l>
  <l i="12">i</l>
  <l i="12">C
</l>
  <l i="12">C-</l>
  <l i="13">J</l>
  <l i="13">j</l>
  <l i="14">K</l>
  <l i="14">k</l>
  <l i="15">L</l>
  <l i="15">l</l>
  <l i="16">M</l>
  <l i="16">m</l>
  <l i="17">N</l>
  <l i="17">n</l>
  <l i="17">E</l>
  <l i="17">E</l>
  <l i="19">O</l>
  <l i="19">o</l>
  <l i="19">C</l>
  <l i="19">C3</l>
  <l i="19">C</l>
  <l i="19">C6</l>
  <l i="20">P</l>
  <l i="20">p</l>
  <l i="21">Q</l>
  <l i="21">q</l>
  <l i="22">R</l>
  <l i="22">r</l>
  <l i="23">E</l>
  <l i="23">E</l>
  <l i="24">S</l>
  <l i="24">s</l>
  <l i="25">E </l>
  <l i="25">E!</l>
  <l i="26">T</l>
  <l i="26">t</l>
  <l i="26">E$</l>
  <l i="26">E%</l>
  <l i="28">U</l>
  <l i="28">u</l>
  <l i="28">C</l>
  <l i="28">C:</l>
  <l i="28">E.</l>
  <l i="28">E/</l>
  <l i="28">C</l>
  <l i="28">C<</l>
  <l i="29">V</l>
  <l i="29">v</l>
  <l i="30">W</l>
  <l i="30">w</l>
  <l i="31">X</l>
  <l i="31">x</l>
  <l i="32">Y</l>
  <l i="32">y</l>
  <l i="32">C</l>
  <l i="32">C=</l>
  <l i="33">Z</l>
  <l i="33">z</l>
  <l i="34">E=</l>
  <l i="34">E></l>
</l:letters>

<xsl:function name="i:group-index" as="xs:integer">
  <xsl:param name="term"/>
  <xsl:variable name="long-letter-index"
select="document('')/*/l:letters/l[. = substring($term,1,2)]/@i"
as="xs:integer?"/>
  <xsl:variable name="short-letter-index"
select="document('')/*/l:letters/l[. = substring($term,1,1)]/@i"
as="xs:integer?"/>
  <xsl:variable name="letter-index">
    <xsl:choose>
      <xsl:when test="$long-letter-index">
        <xsl:sequence select="$long-letter-index"/>
      </xsl:when>
      <xsl:when test="$short-letter-index">
        <xsl:sequence select="$short-letter-index"/>
      </xsl:when>
      <xsl:otherwise>
        <xsl:message>
          No match for: <xsl:value-of select="$term"/>
        </xsl:message>
        <xsl:sequence select="0"/>
      </xsl:otherwise>
    </xsl:choose>
  </xsl:variable>
  <xsl:sequence select="xs:integer($letter-index)"/>
</xsl:function>

For your task you can then use simply:

<xsl:for-each-group select="Word" group-by="i:group-index(.)">

no xsl:sort is needed as function i:group-index() returns number
corresponding to proper collation order, including "ch"

				Jirka


- --
- ------------------------------------------------------------------
  Jirka Kosek      e-mail: jirka@xxxxxxxx      http://xmlguru.cz
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       Professional XML consulting and training services
  DocBook customization, custom XSLT/XSL-FO document processing
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