基于前兄弟处理指令对元素进行分组

Question

我试图使用一个键来分组<p>元素，基于它们是否有一个特定的处理指令作为前面的第一个兄弟，但我没有运气。

对于下面的示例输入，我希望每个具有包含"key"的第一个前兄弟处理指令的<p>与满足相同标准的兄弟<p>元素分组。输入例子:

<root>
    <p>not in key</p>
    <?samplePI key?>
    <p>start of key; </p>
    <?samplePI key?>
    <p>in key 1; </p>
    <?samplePI key?>
    <p>in key 2; </p>
    <p>Not in key</p>
    <?samplePI key?>
    <p>start of new key; </p>
    <?samplePI key?>
    <p>in new key 3;</p>
</root>

示例输出:

<root>
    <p>not in key</p>
    <p>start of key; in key 1; in key 2;</p>
    <p>Not in key</p>
    <p>start of new key; in new key 3;</p>
</root>

我有一个例子:

<xsl:template match="root">
        <root>
            <xsl:apply-templates/>
        </root>
    </xsl:template>
    <xsl:template match="p">
        <xsl:choose>
            <xsl:when test="preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]][preceding-sibling::p[1][(preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]])]]">
            </xsl:when>
            <xsl:when test="preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]][preceding-sibling::p[1][not(preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]])]]">
                <p><xsl:value-of select="text()"/>
                    <xsl:apply-templates select="key('nodes', generate-id())" mode="groupedParas"/>
                </p>
            </xsl:when>
            <xsl:otherwise>
                <p><xsl:apply-templates/></p>
            </xsl:otherwise>
        </xsl:choose>
    </xsl:template>
    <xsl:template match="p" mode="groupedParas">
        <xsl:apply-templates/>
    </xsl:template>

    <xsl:key name="nodes" match="node()[(self::p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]])]" use="generate-id((preceding-sibling::p)[last()])"/>
    <xsl:template match="text()">
        <xsl:value-of select="."/>
    </xsl:template>   

注意，我需要获得正确键语法的帮助，而不是生成所需的结构。为此我需要使用XSLT 1.0。

Answer 1

使用XSLT 2.0，它看起来是可管理的

<?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"
        exclude-result-prefixes="xs"
                version="2.0">
<xsl:strip-space elements="*"/>
<xsl:output indent="yes"/>
<xsl:template match="root">
  <xsl:copy>
    <xsl:for-each-group select="*" group-adjacent="boolean(preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]])">
      <xsl:choose>
        <xsl:when test="current-grouping-key()">
          <p>
            <xsl:apply-templates select="current-group()/node()"/>
          </p>
        </xsl:when>
        <xsl:otherwise>
          <xsl:copy-of select="current-group()"/>
        </xsl:otherwise>
      </xsl:choose>
    </xsl:for-each-group>
  </xsl:copy>
</xsl:template>
</xsl:stylesheet>

对于XSLT 1.0，我通常的方法是兄弟递归，但它需要非常长且复杂的匹配模式:

<?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"
        exclude-result-prefixes="xs"
                version="1.0">
<xsl:strip-space elements="*"/>
<xsl:output indent="yes"/>
<xsl:template match="@* | node()">
  <xsl:copy>
    <xsl:apply-templates select="@* | node()"/>
  </xsl:copy>
</xsl:template>
<xsl:template match="processing-instruction()[contains(., 'key')]"/>
<xsl:template match="p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]
                       and preceding-sibling::node()[2][not(self::p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]])]]">
  <p>
    <xsl:apply-templates select="." mode="collect"/>
  </p>
</xsl:template>
<xsl:template match="p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]
                       and preceding-sibling::node()[2][self::p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]]]]"/>
<xsl:template match="p" mode="collect">
  <xsl:apply-templates/>
  <xsl:apply-templates select="following-sibling::node()[2][self::p and preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]]" mode="collect"/>
</xsl:template>
</xsl:stylesheet>

最后，当您似乎想要使用一个键时，上面所示的兄弟递归的一个变体使用key来标识一组p元素，如下所示:

<?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"
        exclude-result-prefixes="xs"
                version="1.0">
<xsl:strip-space elements="*"/>
<xsl:output indent="yes"/>
<xsl:key name="collect"
         match="p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]
                       and preceding-sibling::node()[2][self::p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]]]]"
         use="generate-id(preceding-sibling::p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]
                                               and not(preceding-sibling::node()[2][self::p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]]])][1])"/>
<xsl:template match="@* | node()">
  <xsl:copy>
    <xsl:apply-templates select="@* | node()"/>
  </xsl:copy>
</xsl:template>
<xsl:template match="processing-instruction()[contains(., 'key')]"/>
<xsl:template match="p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]
                       and preceding-sibling::node()[2][not(self::p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]])]]">
  <p>
    <xsl:apply-templates select="./node() | key('collect', generate-id())/node()"/>
  </p>
</xsl:template>
<xsl:template match="p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]
                       and preceding-sibling::node()[2][self::p[preceding-sibling::node()[1][self::processing-instruction()[contains(., 'key')]]]]]"/>
</xsl:stylesheet>