java – 返回节点集或XML片段(非简单数据类型)的XSLT自定义函数

<root>
<!--
 author: blablabla
 usage: more blablabla
 labelC: [in=2] <b>formatted</b> blablabla
-->
<tag1 name="first">
    <tag2>content a</tag2>
    <tag2>content b</tag2>
    <tag3 attrib="val">content c</tag3>
</tag1>

<!--
 author: blebleble
 usage: more blebleble
 labelC: blebleble
-->
<tag1 name="second">
    <tag2>content x</tag2>
    <tag2>content y</tag2>
    <tag3 attrib="val">content z</tag3>
</tag1>
</root>

<xsl:template match="//tag1/preceding::comment()[1]" xmlns:d="java:com.dummy.func">
    <section>
     <para>
      <xsl:value-of select="d:genDoc(.)"/>
     </para>
    </section>
    </xsl:template>

<section>
     <para>
      <author>blablabla</author>
      <usage>more blablabla</usage>
      <labelC in="2"><b>formatted</b> blablabla</labelC>
     </para>
    </section>

<section>
     <para>
      <author>blebleble</author>
      <usage>more blebleble</usage>
      <labelC>blebleble</labelC>
     </para>
    </section>

org.w3c.dom.traversal.NodeIterator,org.apache.xml.dtm.DTM,org.apache.xml.dtm.DTMAxisIterator,org.apache.xml.dtm.DTMIterator,org.w3c.dom.Node and its subtypes (Element,Attr,etc),org.w3c.dom.DocumentFragment

以下可能会让您沿着您想要前往的道路前行.请注意,这需要XSLT 2.0版本(在XSLT 1.0中,当为tokenize提供替换函数时也是如此).另请注意,这假定了特定的注释内容结构.
说明：注释首先被分成行(分隔符& #xD;这是换行符),然后在标记值(分隔符“：”,分成作者,用法,labelC,这里的顺序并不重要),然后在labelC(delimiter“]”的属性和值中,将属性识别为以“[”开头).
请注意,使用normalize-space()可以完成大量的空白擦除.

编辑：带功能的xslt版本见底部

XSLT

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform">
    <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>

    <xsl:template match="/">
        <output>
            <xsl:apply-templates/>
        </output>
    </xsl:template>

    <xsl:template match="tag1/*">
    </xsl:template>

    <xsl:template match="comment()">
        <section>
            <para>
                <xsl:for-each select="tokenize(.,'&#xD;')[string-length() != 0]">
                    <xsl:variable name="splitup" select="tokenize(normalize-space(current()),':')"/>
                    <xsl:choose>
                        <xsl:when test="$splitup[1]='author'">
                            <author><xsl:value-of select="normalize-space($splitup[2])"/></author>
                        </xsl:when>
                        <xsl:when test="$splitup[1]='usage'">
                            <usage><xsl:value-of select="normalize-space($splitup[2])"/></usage>
                        </xsl:when>
                        <xsl:when test="$splitup[1]='labelC'">
                            <labelC>
                                <xsl:for-each select="tokenize($splitup[2],'] ')[string-length() != 0]">
                                    <xsl:variable name="labelCpart" select="normalize-space(current())"/>
                                    <xsl:choose>
                                        <xsl:when test="substring($labelCpart,1,1) = '['">
                                            <xsl:variable name="attr" select="tokenize(substring($labelCpart,2),'=')"/>
                                            <xsl:attribute name="{$attr[1]}"><xsl:value-of select="$attr[2]"/></xsl:attribute>
                                        </xsl:when>
                                        <xsl:otherwise>
                                            <xsl:value-of select="$labelCpart"/>
                                        </xsl:otherwise>
                                    </xsl:choose>
                                </xsl:for-each>
                            </labelC>
                        </xsl:when>
                    </xsl:choose>
                </xsl:for-each>
            </para>
        </section>
    </xsl:template>

</xsl:stylesheet>

当应用于以下XML时

<?xml version="1.0" encoding="UTF-8"?>
<root>
<!--
 author: blablabla
 usage: more blablabla
 labelC: [in=2] <b>formatted</b> blablabla
-->
<tag1 name="first">
    <tag2>content a</tag2>
    <tag2>content b</tag2>
    <tag3 attrib="val">content c</tag3>
</tag1>

<!--
 author: blebleble
 usage: more blebleble
 labelC: blebleble
-->
<tag1 name="second">
    <tag2>content x</tag2>
    <tag2>content y</tag2>
    <tag3 attrib="val">content z</tag3>
</tag1>
</root>

给出以下输出

<?xml version="1.0" encoding="UTF-8"?>
<output>
    <section>
        <para>
            <author>blablabla</author>
            <usage>more blablabla</usage>
            <labelC in="2">&lt;b&gt;formatted&lt;/b&gt; blablabla</labelC>
        </para>
    </section>
    <section>
        <para>
            <author>blebleble</author>
            <usage>more blebleble</usage>
            <labelC>blebleble</labelC>
        </para>
    </section>
</output>

用函数调用EDITED xslt(给出相同的输出)

<?xml version="1.0" encoding="UTF-8"?>
<xsl:stylesheet version="2.0"
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
xmlns:d="java:com.dummy.func"
exclude-result-prefixes="d">

    <xsl:output method="xml" version="1.0" encoding="UTF-8" indent="yes"/>

    <xsl:template match="/">
        <output>
            <xsl:apply-templates/>
        </output>
    </xsl:template>

    <xsl:template match="tag1/*">
    </xsl:template>

    <xsl:function name="d:section">
        <xsl:param name="comm"/>
        <section>
            <para>
                <xsl:for-each select="tokenize($comm,'=')"/>
                                            <xsl:attribute name="{$attr[1]}"><xsl:value-of select="$attr[2]"/></xsl:attribute>
                                        </xsl:when>
                                        <xsl:otherwise>
                                            <xsl:value-of select="$labelCpart"/>
                                        </xsl:otherwise>
                                    </xsl:choose>
                                </xsl:for-each>
                            </labelC>
                        </xsl:when>
                    </xsl:choose>
                </xsl:for-each>
            </para>
        </section>
    </xsl:function>

    <xsl:template match="comment()">
        <xsl:copy-of select="d:section(.)"/>
    </xsl:template>

</xsl:stylesheet>