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222

answers:

2
Q: 

xslt php select the first sibling and all its child nodes

How does one select the first sibling of a xml node with all its child nodes and apply some transformations on it? So far I only succeeded in selected either the first sibling and only the first sibling (no child nodes that is) or everything following the xml node.

Say we have xhtml like this:

<div class="chapter">Chapter <span class="number">1.1</span> Lorum ipsum</div>
<h2 class="article">Article <span class="number">1.</span> Lorum ipsum</h2>
<p>Lorum ipsum</p>

And the result we are after is xml like this:

<chapter>
  <heading>
    <label>Chapter</chapter>
    <number>1.1</number>
    <title>Lorum ipsum</title>
  </heading>
  <article>
    <heading>
      <label>Article</chapter>
      <number>1.</number>
      <title>Lorum ipsum</title>
    </heading>
    <par>Lorum ipsum</par>
  </article>
</chapter>

My guess is that I need to do some regex magic to get the label and title tags right, but if this could also been done using plain xslt that would be great.

+1  A: 

This XSLT 1.0 transformation:

<xsl:stylesheet 
  version="1.0"
  xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
  xmlns:xhtml="http://www.w3.org/1999/xhtml"
  exclude-result-prefixes="xhtml"
>
  <xsl:output encoding="utf-8" />

  <!-- the identity template (copies all nodes verbatim, unless
       more specific templates implement different behavior) -->
  <xsl:template match="node()|@*">
    <xsl:copy>
      <xsl:apply-templates select="node()|@*" />
    </xsl:copy>
  </xsl:template>

  <!-- start by applying templates to all chapter divs -->
  <xsl:template match="xhtml:html">
    <text>
      <xsl:apply-templates select="xhtml:body/xhtml:div[@class='chapter']" />
    </text>
  </xsl:template>

  <!-- chapter div: generate heading, apply templates to adjacent h2 -->
  <xsl:template match="xhtml:div[@class='chapter']">
    <chapter>
      <xsl:apply-templates select="." mode="heading" />
      <!-- ... where the first preceding chapter div has the same ID -->
      <xsl:apply-templates select="
        following-sibling::xhtml:h2[
          generate-id(preceding-sibling::xhtml:div[@class='chapter'][1])
          =
          generate-id(current())
        ]
      "/>
    </chapter>
  </xsl:template>

  <!-- h2: generate heading, apply templates to adjacent paras -->
  <xsl:template match="xhtml:h2[@class='article']">
    <article>
      <xsl:apply-templates select="." mode="heading" />
      <xsl:apply-templates select="
        following-sibling::xhtml:p[
          generate-id(preceding-sibling::xhtml:h2[@class='article'][1])
          =
          generate-id(current())
        ]
      "/>
    </article>
  </xsl:template>

  <!-- headings follow the same scheme, so we can use a unified template -->
  <xsl:template match="xhtml:div | xhtml:h2" mode="heading">
    <heading>
      <label>
        <xsl:value-of select="normalize-space(text()[1])" />
      </label>
      <number>
        <xsl:value-of select="normalize-space(xhtml:span[@class='number'])" />
      </number>
      <title>
        <xsl:value-of select="normalize-space(text()[2])" />
      </title>
    </heading>
  </xsl:template>

  <xsl:template match="xhtml:p">
    <par>
      <xsl:apply-templates select="node()" />
    </par>
  </xsl:template>

</xsl:stylesheet>

when applied to

<html xmlns="http://www.w3.org/1999/xhtml"&gt;
  <body>
    <div class="chapter">Chapter <span class="number">1.1</span> Lorum ipsum</div>
    <h2 class="article">Article <span class="number">1.</span> Lorum ipsum</h2>
    <p>Lorum ipsum A</p>
    <p>Lorum ipsum B</p>
    <h2 class="article">Article <span class="number">2.</span> Lorum ipsum</h2>
    <p>Lorum ipsum D</p>
    <h2 class="article">Article <span class="number">3.</span> Lorum ipsum</h2>
    <p>Lorum ipsum E</p>
    <p>Lorum ipsum F</p>
    <div class="chapter">Chapter <span class="number">2.1</span> Lorum ipsum</div>
    <h2 class="article">Article <span class="number">1.</span> Lorum ipsum</h2>
    <p>Lorum ipsum G</p>
  </body>
</html>

yields:

<text>
  <chapter>
    <heading>
      <label>Chapter</label>
      <number>1.1</number>
      <title>Lorum ipsum</title>
    </heading>
    <article>
      <heading>
        <label>Article</label>
        <number>1.</number>
        <title>Lorum ipsum</title>
      </heading>
      <par>Lorum ipsum A</par>
      <par>Lorum ipsum B</par>
    </article>
    <article>
      <heading>
        <label>Article</label>
        <number>2.</number>
        <title>Lorum ipsum</title>
      </heading>
      <par>Lorum ipsum D</par>
    </article>
    <article>
      <heading>
        <label>Article</label>
        <number>3.</number>
        <title>Lorum ipsum</title>
      </heading>
      <par>Lorum ipsum E</par>
      <par>Lorum ipsum F</par>
    </article>
  </chapter>
  <chapter>
    <heading>
      <label>Chapter</label>
      <number>2.1</number>
      <title>Lorum ipsum</title>
    </heading>
    <article>
      <heading>
        <label>Article</label>
        <number>1.</number>
        <title>Lorum ipsum</title>
      </heading>
      <par>Lorum ipsum G</par>
    </article>
  </chapter>
</text>
Tomalak  2010-02-11 15:36:32
+1  A: 

This stylesheet creates the desired output:

<xsl:template match="html:div[@class='chapter']" mode="chapter">
    <xsl:element name="{@class}">
        <heading>
            <xsl:apply-templates mode="chapter" />
        </heading>
        <xsl:apply-templates select="following-sibling::html:h2[generate-id(preceding-sibling::html:div[@class='chapter'][1])=generate-id(current())]" mode="chapter" />
    </xsl:element>
</xsl:template>

<!--template for h2 in "chapter" mode, creates article content for the chapter-->
<xsl:template match="html:h2[@class='article']" mode="chapter">
    <xsl:element name="{@class}">
        <heading>
            <xsl:apply-templates mode="chapter"/>
        </heading>
        <xsl:apply-templates select="following-sibling::html:p[generate-id(preceding-sibling::html:h2[@class='article'][1])=generate-id(current())]" mode="chapter" />
    </xsl:element>
</xsl:template>

<xsl:template match="text()[following-sibling::html:span[@class='number']]" mode="chapter">
    <label><xsl:value-of select="normalize-space()"/></label>
</xsl:template>

<!--Generate an (number) element using the class attribute as the name of the element-->
<xsl:template match="html:span[@class='number']" mode="chapter">
    <xsl:element name="{@class}">
        <xsl:value-of select="."/>
    </xsl:element>
</xsl:template>

<!--title elements created for text nodes before the -->
<xsl:template match="text()[preceding-sibling::html:span[@class='number']]" mode="chapter">
    <title><xsl:value-of select="normalize-space()"/></title>
</xsl:template>

<!--Template in "chapter" mode, creates a par element inside the article-->
<xsl:template match="html:p" mode="chapter">
    <para><xsl:value-of select="normalize-space()"/></para>
</xsl:template>

<!--prevent text from bleeding through in output-->
<xsl:template match="text()" mode="chapter"/>

Using Tomalak's example input XML, produces:

<?xml version="1.0" encoding="UTF-8"?>
<book>
    <chapter>
        <heading>
            <label>Chapter</label>
            <number>1.1</number>
            <title>Lorum ipsum</title>
        </heading>
        <article>
            <heading>
                <label>Article</label>
                <number>1.</number>
                <title>Lorum ipsum</title>
            </heading>
            <para>Lorum ipsum A</para>
            <para>Lorum ipsum B</para>
        </article>
        <article>
            <heading>
                <label>Article</label>
                <number>2.</number>
                <title>Lorum ipsum</title>
            </heading>
            <para>Lorum ipsum D</para>
        </article>
        <article>
            <heading>
                <label>Article</label>
                <number>3.</number>
                <title>Lorum ipsum</title>
            </heading>
            <para>Lorum ipsum E</para>
            <para>Lorum ipsum F</para>
        </article>
    </chapter>
    <chapter>
        <heading>
            <label>Chapter</label>
            <number>2.1</number>
            <title>Lorum ipsum</title>
        </heading>
        <article>
            <heading>
                <label>Article</label>
                <number>1.</number>
                <title>Lorum ipsum</title>
            </heading>
            <para>Lorum ipsum G</para>
        </article>
    </chapter>
</book>
Mads Hansen  2010-02-11 15:59:04
This is flawed, please test it with the XML I used.
Tomalak  2010-02-11 16:31:33
@Tomalak: Aww snap. Of course you are right. I made improvements(borrowing from your answer) that correctly handle a full set of input with multiple chapters, articles, and paras(like your sample input has), rather than just the limited example from the question and made adjustments for XHTML namespace.
Mads Hansen  2010-02-11 18:48:28
Now it's +1. ;)
Tomalak  2010-02-11 18:53:21
Thank you both very much! Now all I have to do is merge this with the xslt I already have, thanks again.
Jeroen Beerstra  2010-02-12 08:07:03
Hmm that was a little bit too quick :( The first example (Tomalak) seems to work but only partially (most of the text in paragraphs and ul's is lost), the second one mostly doesn't do anything (seems like only the chapters and headings are matched) :( I must admit my example was perhaps a little bit oversimplified as the real xhtml contains a lot more different elements, but I just wanted to present the basic problem/question I had.
Jeroen Beerstra  2010-02-12 10:49:26

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