Subject: Re: [xsl] Grouping a sequence of elements in different ways in the same stylesheet From: Peter Desjardins <peter.desjardins.us@xxxxxxxxx> Date: Mon, 24 May 2010 11:53:43 -0400 |
Thanks to all for the help. I'll work with these suggestions. Peter On Fri, May 21, 2010 at 5:50 PM, Imsieke, Gerrit, le-tex <gerrit.imsieke@xxxxxxxxx> wrote: > > > On 21.05.2010 23:09, Peter Desjardins wrote: >> >> Can anyone point me to an example of that sort of stylesheet? One that >> performs several types of grouping during the same pass over a >> sequence of elements? Here's an example of the code I'm using. Both of >> the grouping operations will work if I use them alone. >> >> <xsl:template match = "body/div"> >> <xsl:for-each-group select = "current-group()" group-adjacent = >> "name()='p' and @class='bulletedlist'"> >> <xsl:apply-templates select = "." mode = "itemizedlist" /> >> </xsl:for-each-group> >> <!-- How do I perform both of these grouping operations at the >> same time? --> >> <xsl:for-each-group select = "*" group-starting-with = >> "p[@class='head1']"> >> <xsl:apply-templates select="." mode="group-level-one"/> >> </xsl:for-each-group> >> </xsl:template> > > It's ok to group in a single pass, but not at the same time. You should use > nested groupings. Section hierarchy (group-starting-with) comes first, then > the sections' contents will be grouped according to whether they are list > items or not. > > Here's a sample XHTML body as input: > > ===========8<----------------------- > <?xml version="1.0" encoding="utf-8"?> > <body> > <p>pre</p> > <p class="bulletedlist">one</p> > <p class="bulletedlist">two</p> > <p class="bulletedlist">three</p> > <h5>This is h5</h5> > <h4>Attribution</h4> > <p>...</p> > <h3>Preface</h3> > <p class="orderedlist">1. one</p> > <p class="orderedlist">2. two</p> > <p class="bulletedlist">one</p> > <p class="bulletedlist">two</p> > <p class="bulletedlist">three</p> > <p class="orderedlist">3. three</p> > <h4>[Preface]</h4> > <p>...</p> > <h3>INTRODUCTION</h3> > <p>...</p> > <p class="bulletedlist">one</p> > <p class="bulletedlist">two</p> > <h5>baz</h5> > <p>foo</p> > </body> > ===========8<----------------------- > > Here's a stylesheet to process the input > > ===========8<----------------------- > <?xml version="1.0" encoding="utf-8"?> > <xsl:stylesheet > xmlns:xsl="http://www.w3.org/1999/XSL/Transform" > xmlns:xs="http://www.w3.org/2001/XMLSchema" > xmlns:my="my" > version="2.0" > exclude-result-prefixes="my xs" > > > > <xsl:output method="xml" indent="yes" /> > > <xsl:template match="/"> > <xsl:apply-templates/> > </xsl:template> > > <xsl:template match="body"> > <xsl:copy> > <xsl:sequence select="my:hierarchize(*)" /> > </xsl:copy> > </xsl:template> > > <xsl:function name="my:hierarchize" as="element(*)*"> > <xsl:param name="nodes" as="element(*)*" /> > <xsl:for-each-group select="$nodes" > group-starting-with="*[my:isHeading(.)][ > my:hlevel(.) le min( > ( > for $ph in ( > preceding-sibling::* > intersect $nodes[my:isHeading(.)] > ) > return my:hlevel($ph), > 6 > ) > ) > ]"> > <xsl:choose> > <xsl:when test="my:isHeading(.)"> > <div class="level{my:hlevel(.)}"> > <title> > <!-- please note that node() are all nodes of the context > item, which is the group's first element, i.e., the > heading: --> > <xsl:copy-of select="node()" /> > </title> > <!-- will be called recursively: --> > <xsl:sequence > select="my:hierarchize(current-group()[position() gt 1])" /> > </div> > </xsl:when> > <xsl:otherwise> > <!-- until no heading is in the nodes to process. > Then start processing the lists: --> > <xsl:sequence select="my:listify(current-group())" /> > </xsl:otherwise> > </xsl:choose> > </xsl:for-each-group> > </xsl:function> > > <xsl:function name="my:listify" as="element(*)*"> > <xsl:param name="nodes" as="element(*)*" /> > <xsl:for-each-group select="$nodes" > group-adjacent="boolean(self::p[@class='bulletedlist'])"> > <xsl:choose> > <xsl:when test="current-grouping-key()"> > <itemizedlist> > <xsl:sequence select="current-group()" /> > </itemizedlist> > </xsl:when> > <xsl:otherwise> > <xsl:sequence select="current-group()" /> > </xsl:otherwise> > </xsl:choose> > </xsl:for-each-group> > </xsl:function> > > <xsl:function name="my:isHeading" as="xs:boolean"> > <xsl:param name="elt" as="element(*)" /> > <xsl:value-of select="matches(local-name($elt), '^h\d$')" /> > </xsl:function> > > <xsl:function name="my:hlevel" as="xs:double"> > <xsl:param name="elt" as="element(*)" /> > <xsl:value-of select="number(replace(local-name($elt), '^h(\d)$', '$1'))" > /> > </xsl:function> > > </xsl:stylesheet> > ===========8<----------------------- > > Gerrit
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