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使用 XSLT 截断 XML

发布于 2024-07-13 14:31:40 字数 1798 浏览 9 评论 0 原文

我有一个问题要问 SO 社区的聪明人。

以下是 Symphony CMS 生成的 XML 片段。

   <news>
        <entry>
            <title>Lorem Ipsum</title>
            <body>
                <p><strong>Lorem Ipsum</strong></p>
                <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed malesuada auctor magna. Vivamus urna justo, pulvinar nec, sagittis malesuada, accumsan in, massa. Quisque mi purus, gravida eget, ultricies a, porta in, sem. Maecenas justo elit, elementum vel, feugiat vulputate, pulvinar nec, velit. Fusce vel ante et diam bibendum euismod. Nunc vel nulla non lorem dignissim placerat. Nulla magna massa, auctor et, tempor nec, auctor sit amet, turpis. Quisque odio lacus, auctor at, posuere id, suscipit eget, dui. Phasellus aliquam. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Proin varius. Phasellus cursus. Cras mattis adipiscing turpis. Sed.</p>
                <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed malesuada auctor magna.</p>
            </body>
        </entry>
    </news>

我需要做的是根据指定的长度获取元素的一部分，以以下博客样式显示：

Lorem ipsum dolor sat amet， consectetur adipiscing elit。塞德马莱苏阿达麦格纳演员。维瓦姆斯乌尔纳 justo、pulvinar nec、sagittis malesuada、accumsan、马萨。基斯克 mi purus, gravida eget, ultricies a, porta in，sem...更多

...其中 more 是完整新闻项目的链接。我知道我可以选择特定的段落，我也知道我可以使用 substring 函数来带来指定数量的字符。但是，我需要保留文本的格式，即元素中的 HTML 标记。

我意识到这会引起标签关闭的问题，但肯定有办法。希望对 XSLT 更有经验的人能够阐明这个问题。

原文

I have a question for the clever people of the SO community.

Below is a snippet of XML generated by the Symphony CMS.

   <news>
        <entry>
            <title>Lorem Ipsum</title>
            <body>
                <p><strong>Lorem Ipsum</strong></p>
                <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed malesuada auctor magna. Vivamus urna justo, pulvinar nec, sagittis malesuada, accumsan in, massa. Quisque mi purus, gravida eget, ultricies a, porta in, sem. Maecenas justo elit, elementum vel, feugiat vulputate, pulvinar nec, velit. Fusce vel ante et diam bibendum euismod. Nunc vel nulla non lorem dignissim placerat. Nulla magna massa, auctor et, tempor nec, auctor sit amet, turpis. Quisque odio lacus, auctor at, posuere id, suscipit eget, dui. Phasellus aliquam. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Proin varius. Phasellus cursus. Cras mattis adipiscing turpis. Sed.</p>
                <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed malesuada auctor magna.</p>
            </body>
        </entry>
    </news>

What I need to do is take a portion of the <body> element, based on a specified length, for display in the blog style of:

Lorem ipsum dolor sit amet,
consectetur adipiscing elit. Sed
malesuada auctor magna. Vivamus urna
justo, pulvinar nec, sagittis
malesuada, accumsan in, massa. Quisque
mi purus, gravida eget, ultricies a,
porta in, sem... more

...where more is a link to the full news item. I know I can select specific paragraphs and I also know I can use the substring function to bring a specified number of characters. However, I need to preserve the formatting of the text, i.e. the HTML tags within the <body> element.

I realise this raises issues of tag closure but there must surely be a way. Hopefully someone more experienced with XSLT can shed some light on this issue.

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残龙傲雪 2024-07-20 14:31:41

这是一个完整的 XSLT 1.0 转换，它完全解决了问题。

此 XSLT 转换：

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:ext="http://exslt.org/common"
 xmlns:f="http://fxsl.sf.net/"
 xmlns:myAdd="f:myAdd"
 xmlns:myParam="f:myParam"
 exclude-result-prefixes="ext f myAdd myParam"
>
 <xsl:import href="scanl.xsl"/>
 <!--                                         -->
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>
 <!--                                         -->
 <myAdd:myAdd/>
 <myParam:myParam>0</myParam:myParam>
 <!--                                         -->
 <xsl:param name="pTruncateLength" select="772"/>
 <!--                                         -->
   <xsl:variable name="vFun" select="document('')/*/myAdd:*[1]"/>
   <xsl:variable name="vZero" select="document('')/*/myParam:*[1]"/>
 <!--                                         -->
   <xsl:variable name="vrtfScanResults">
           <xsl:call-template name="scanl">
             <xsl:with-param name="pFun" select="$vFun"/>
             <xsl:with-param name="pQ0" select="$vZero" />
             <xsl:with-param name="pList" select="/*/*/body//text()"/>
           </xsl:call-template>
   </xsl:variable>
 <!--                                         -->
   <xsl:variable name="vScanResults"
        select="ext:node-set($vrtfScanResults)"/>
   <xsl:variable name="vindNode" select=
    "count($vScanResults/*[. > $pTruncateLength][1]
                                   /preceding-sibling::*)"/>
 <!--                                         -->
   <xsl:variable name="vrtfTruncInfo">
       <xsl:for-each select="/*/*/body//text()">
 <!--                                         -->
         <xsl:variable name="vPos" select="position()"/>
         <tNode id="{generate-id()}">
           <xsl:attribute name="preserve">
             <xsl:if test="$vPos < $vindNode">
               <xsl:value-of select="string-length(.)"/>
             </xsl:if>
             <xsl:if test="$vPos > $vindNode">
               <xsl:value-of select="0"/>
             </xsl:if>
             <xsl:if test="$vPos = $vindNode">
               <xsl:value-of select=
               "$vScanResults/*[$vindNode+1]
               -
                $pTruncateLength"/>
             </xsl:if>
           </xsl:attribute>
         </tNode>
       </xsl:for-each>
   </xsl:variable>
 <!--                                         -->
   <xsl:variable name="vTruncInfo" select="ext:node-set($vrtfTruncInfo)"/>
 <!--                                         -->
 <xsl:template match="node()|@*">
   <xsl:copy>
     <xsl:apply-templates select="node()|@*"/>
   </xsl:copy>
 </xsl:template>
 <!--                                         -->
 <xsl:template match="text()[ancestor::body]">
   <xsl:variable name="vAllowedLength"
        select="$vTruncInfo/*[@id = generate-id(current())]/@preserve"
   />
 <!--                                         -->
   <xsl:value-of select="substring(.,1,$vAllowedLength)"/>

   <xsl:if test="string-length(.) > $vAllowedLength
               and
                 $vAllowedLength > 0
                ">
     <strong> ...more</strong>
   </xsl:if>
 </xsl:template>
 <!--                                         -->
 <xsl:template match="myAdd:*" mode="f:FXSL">
   <xsl:param name="pArg1"/>
   <xsl:param name="pArg2"/>
   <xsl:value-of select="$pArg1 + string-length($pArg2)"/>
 </xsl:template>
</xsl:stylesheet>

应用于原始源 XML 文档时：

<news>
    <entry>
        <title>Lorem Ipsum</title>
        <body>
            <p>
                <strong>Lorem Ipsum</strong>
            </p>
            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed malesuada auctor magna. Vivamus urna justo, pulvinar nec, sagittis malesuada, accumsan in, massa. Quisque mi purus, gravida eget, ultricies a, porta in, sem. Maecenas justo elit, elementum vel, feugiat vulputate, pulvinar nec, velit. Fusce vel ante et diam bibendum euismod. Nunc vel nulla non lorem dignissim placerat. Nulla magna massa, auctor et, tempor nec, auctor sit amet, turpis. Quisque odio lacus, auctor at, posuere id, suscipit eget, dui. Phasellus aliquam. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Proin varius. Phasellus cursus. Cras mattis adipiscing turpis. Sed.</p>
            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed malesuada auctor magna.</p>
            <p>This text should not be displayed</p>
        </body>
    </entry>
</news>

产生所需的结果 >：

<news>
   <entry>
      <title>Lorem Ipsum</title>
      <body>
         <p>
            <strong>Lorem Ipsum</strong>
         </p>
         <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed malesuada auctor magna. Vivamus urna justo, pulvinar nec, sagittis malesuada, accumsan in, massa. Quisque mi purus, gravida eget, ultricies a, porta in, sem. Maecenas justo elit, elementum vel, feugiat vulputate, pulvinar nec, velit. Fusce vel ante et diam bibendum euismod. Nunc vel nulla non lorem dignissim placerat. Nulla magna massa, auctor et, tempor nec, auctor sit amet, turpis. Quisque odio lacus, auctor at, posuere id, suscipit eget, dui. Phasellus aliquam. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Proin varius. Phasellus cursus. Cras mattis adipiscing turpis. Sed.</p>
         <p>Lorem <strong> ...more</strong>
         </p>
         <p/>
      </body>
   </entry>
</news>

请注意以下内容：

FXSL 库 已导入。此模板通常用于积累处理项目列表的数据。执行实际处理的函数（与 myAdd:* 匹配的模板）作为参数传递给 scanl 模板。必须传递给它的另一个参数是处理中的“初始”值，如果传递的项目列表为空，则返回该值。
全局参数$pTruncateLength保存最大字符串长度，超过该长度文本必须被截断

Here is a complete XSLT 1.0 transformation that solves exactly the problem.

This XSLT transformation:

<xsl:stylesheet version="1.0"
 xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
 xmlns:ext="http://exslt.org/common"
 xmlns:f="http://fxsl.sf.net/"
 xmlns:myAdd="f:myAdd"
 xmlns:myParam="f:myParam"
 exclude-result-prefixes="ext f myAdd myParam"
>
 <xsl:import href="scanl.xsl"/>
 <!--                                         -->
 <xsl:output omit-xml-declaration="yes" indent="yes"/>
 <xsl:strip-space elements="*"/>
 <!--                                         -->
 <myAdd:myAdd/>
 <myParam:myParam>0</myParam:myParam>
 <!--                                         -->
 <xsl:param name="pTruncateLength" select="772"/>
 <!--                                         -->
   <xsl:variable name="vFun" select="document('')/*/myAdd:*[1]"/>
   <xsl:variable name="vZero" select="document('')/*/myParam:*[1]"/>
 <!--                                         -->
   <xsl:variable name="vrtfScanResults">
           <xsl:call-template name="scanl">
             <xsl:with-param name="pFun" select="$vFun"/>
             <xsl:with-param name="pQ0" select="$vZero" />
             <xsl:with-param name="pList" select="/*/*/body//text()"/>
           </xsl:call-template>
   </xsl:variable>
 <!--                                         -->
   <xsl:variable name="vScanResults"
        select="ext:node-set($vrtfScanResults)"/>
   <xsl:variable name="vindNode" select=
    "count($vScanResults/*[. > $pTruncateLength][1]
                                   /preceding-sibling::*)"/>
 <!--                                         -->
   <xsl:variable name="vrtfTruncInfo">
       <xsl:for-each select="/*/*/body//text()">
 <!--                                         -->
         <xsl:variable name="vPos" select="position()"/>
         <tNode id="{generate-id()}">
           <xsl:attribute name="preserve">
             <xsl:if test="$vPos < $vindNode">
               <xsl:value-of select="string-length(.)"/>
             </xsl:if>
             <xsl:if test="$vPos > $vindNode">
               <xsl:value-of select="0"/>
             </xsl:if>
             <xsl:if test="$vPos = $vindNode">
               <xsl:value-of select=
               "$vScanResults/*[$vindNode+1]
               -
                $pTruncateLength"/>
             </xsl:if>
           </xsl:attribute>
         </tNode>
       </xsl:for-each>
   </xsl:variable>
 <!--                                         -->
   <xsl:variable name="vTruncInfo" select="ext:node-set($vrtfTruncInfo)"/>
 <!--                                         -->
 <xsl:template match="node()|@*">
   <xsl:copy>
     <xsl:apply-templates select="node()|@*"/>
   </xsl:copy>
 </xsl:template>
 <!--                                         -->
 <xsl:template match="text()[ancestor::body]">
   <xsl:variable name="vAllowedLength"
        select="$vTruncInfo/*[@id = generate-id(current())]/@preserve"
   />
 <!--                                         -->
   <xsl:value-of select="substring(.,1,$vAllowedLength)"/>

   <xsl:if test="string-length(.) > $vAllowedLength
               and
                 $vAllowedLength > 0
                ">
     <strong> ...more</strong>
   </xsl:if>
 </xsl:template>
 <!--                                         -->
 <xsl:template match="myAdd:*" mode="f:FXSL">
   <xsl:param name="pArg1"/>
   <xsl:param name="pArg2"/>
   <xsl:value-of select="$pArg1 + string-length($pArg2)"/>
 </xsl:template>
</xsl:stylesheet>

when applied on the original source XML document:

<news>
    <entry>
        <title>Lorem Ipsum</title>
        <body>
            <p>
                <strong>Lorem Ipsum</strong>
            </p>
            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed malesuada auctor magna. Vivamus urna justo, pulvinar nec, sagittis malesuada, accumsan in, massa. Quisque mi purus, gravida eget, ultricies a, porta in, sem. Maecenas justo elit, elementum vel, feugiat vulputate, pulvinar nec, velit. Fusce vel ante et diam bibendum euismod. Nunc vel nulla non lorem dignissim placerat. Nulla magna massa, auctor et, tempor nec, auctor sit amet, turpis. Quisque odio lacus, auctor at, posuere id, suscipit eget, dui. Phasellus aliquam. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Proin varius. Phasellus cursus. Cras mattis adipiscing turpis. Sed.</p>
            <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed malesuada auctor magna.</p>
            <p>This text should not be displayed</p>
        </body>
    </entry>
</news>

produces the wanted result:

<news>
   <entry>
      <title>Lorem Ipsum</title>
      <body>
         <p>
            <strong>Lorem Ipsum</strong>
         </p>
         <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Sed malesuada auctor magna. Vivamus urna justo, pulvinar nec, sagittis malesuada, accumsan in, massa. Quisque mi purus, gravida eget, ultricies a, porta in, sem. Maecenas justo elit, elementum vel, feugiat vulputate, pulvinar nec, velit. Fusce vel ante et diam bibendum euismod. Nunc vel nulla non lorem dignissim placerat. Nulla magna massa, auctor et, tempor nec, auctor sit amet, turpis. Quisque odio lacus, auctor at, posuere id, suscipit eget, dui. Phasellus aliquam. Cum sociis natoque penatibus et magnis dis parturient montes, nascetur ridiculus mus. Proin varius. Phasellus cursus. Cras mattis adipiscing turpis. Sed.</p>
         <p>Lorem <strong> ...more</strong>
         </p>
         <p/>
      </body>
   </entry>
</news>

Do note the following:

The scanl stylesheet from the FXSL library is imported. This template is commonly used to accumulate data from processing a list of items. The function (the template matching myAdd:*) that does the actual processing is passed as a parameter to the scanl template. The other parameter that must be passed to it is the "initial" value from processing, which is to be returned if the passed list of items is empty.
The global parameter $pTruncateLength holds the maximum string length exceeding which the text must be truncated

回复收藏 0 原文

恰似旧人归 2024-07-20 14:31:41

您要求的是一个 XSLT 省略号 生成器。

也许这个 xslt 1.0 模板可能会给您一些想法：

以下是其主要要点：

<xsl:template match="text()" mode="label">
    <xsl:param name="self-x"/>
    <xsl:param name="self-y"/>
    <xsl:variable name="text" select="normalize-space(.)"/>
    <!-- a quick and dirty way to avoid problems with line breaks -->
    <!-- replace the select attribute with this call
         if you want to use a fancier way to escape whitespace
         characters:
          <xsl:call-template name="escape-ws"
            <xsl:with-param name="text" select="." /
          </xsl:call-template
    -->
    <use xlink:href="#text-box" transform="translate({$self-x} 
 {$self-y})"/>
    <!-- text nodes are marked with a little box -->
    <text x="{$self-x + $writing-bump-over}"
          y="{$self-y - $writing-bump-up}"
          style="{$text-font-style}; stroke:none; fill:{$text-color}">
      <xsl:text>"</xsl:text>
      <xsl:value-of select="substring($text,1,$max-text-length)"/>
      <!-- truncate the text node to $max-text-length -->
      <xsl:if test="string-length($text) > $max-text-length">
        <!-- add an ellipsis if necessary -->
        <xsl:text>...</xsl:text>
      </xsl:if>
      <xsl:text>"</xsl:text>
    </text>
  </xsl:template>

注意：

您需要用链接替换省略号，但主要思想就在那里。
所有脚本的一小部分
这仅代表您可能的不需要其中的所有内容：如果您需要“声明 xlink 命名空间

What you are asking is an XSLT ellipsis generator.

May be this xslt 1.0 template might give you some idea:

Here is the main gist of it:

<xsl:template match="text()" mode="label">
    <xsl:param name="self-x"/>
    <xsl:param name="self-y"/>
    <xsl:variable name="text" select="normalize-space(.)"/>
    <!-- a quick and dirty way to avoid problems with line breaks -->
    <!-- replace the select attribute with this call
         if you want to use a fancier way to escape whitespace
         characters:
          <xsl:call-template name="escape-ws"
            <xsl:with-param name="text" select="." /
          </xsl:call-template
    -->
    <use xlink:href="#text-box" transform="translate({$self-x} 
 {$self-y})"/>
    <!-- text nodes are marked with a little box -->
    <text x="{$self-x + $writing-bump-over}"
          y="{$self-y - $writing-bump-up}"
          style="{$text-font-style}; stroke:none; fill:{$text-color}">
      <xsl:text>"</xsl:text>
      <xsl:value-of select="substring($text,1,$max-text-length)"/>
      <!-- truncate the text node to $max-text-length -->
      <xsl:if test="string-length($text) > $max-text-length">
        <!-- add an ellipsis if necessary -->
        <xsl:text>...</xsl:text>
      </xsl:if>
      <xsl:text>"</xsl:text>
    </text>
  </xsl:template>

Note:

you will need to replace the ellipsis by a link, but the main idea is there.
this represents only a small extract of the all script
you may not need everything in it: if you need "<use xlink:href="...", you need to declare the xlink namespace

回复收藏 0 原文

我的影子我的梦 2024-07-20 14:31:41

经过多次黑客攻击后，我得出了这个解决方案：

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

<!--
    Author: Neil Albrock
    Version: 1.0
    Description: Truncate by a character limit and retain HTML content.
    Usage: 
        <xsl:call-template name="truncate">
            <xsl:with-param name="data" select="path/to/your/body" />
            <xsl:with-param name="length" select="250" />
            <xsl:with-param name="link" select="'href'" />
        </xsl:call-template>
-->

<xsl:template name="truncate">

    <!-- The node set to be worked on. -->
    <xsl:param name="data"/>
    <!-- The desired truncate length. Default to length of data. -->
    <xsl:param name="length" select="string-length($data)"/>
    <!-- More link -->
    <xsl:param name="link"/>

    <xsl:choose>
        <!-- Return whole data if it's within length. -->
        <xsl:when test="string-length($data) <= $length">
            <xsl:copy-of select="$data" />
        </xsl:when>
        <!-- Truncate to desired length. -->
        <xsl:otherwise>
            <xsl:for-each select="$data/*">
                <xsl:variable name="this-node" select="string-length(.)"/>
                <xsl:variable name="preceding-nodes">
                    <xsl:copy-of select="preceding-sibling::*"/>
                </xsl:variable>
                <xsl:variable name="node-sum" select="string-length(normalize-space($preceding-nodes))"/>
                <xsl:variable name="limit" select="$node-sum + $this-node"/>

                <xsl:choose>
                    <xsl:when test="$limit > $length and $node-sum <= $length">
                        <p>
                        <xsl:value-of select="substring(.,1,$length - $node-sum)"/>
                        <xsl:text>…</xsl:text>
                        <a>
                            <xsl:attribute name="href">
                                <xsl:value-of select="$link"/>
                            </xsl:attribute>
                            <xsl:text>more</xsl:text>
                        </a>
                        </p>
                    </xsl:when>
                    <xsl:when test="$limit < $length">
                        <xsl:copy-of select="."/>
                    </xsl:when>
                    <xsl:otherwise/>
                </xsl:choose>

            </xsl:for-each>
        </xsl:otherwise>
    </xsl:choose>

</xsl:template>

</xsl:stylesheet>

不过，我会使用混沌模式的解决方案，它更优雅;-)

After much hacking, I came to this solution:

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

<!--
    Author: Neil Albrock
    Version: 1.0
    Description: Truncate by a character limit and retain HTML content.
    Usage: 
        <xsl:call-template name="truncate">
            <xsl:with-param name="data" select="path/to/your/body" />
            <xsl:with-param name="length" select="250" />
            <xsl:with-param name="link" select="'href'" />
        </xsl:call-template>
-->

<xsl:template name="truncate">

    <!-- The node set to be worked on. -->
    <xsl:param name="data"/>
    <!-- The desired truncate length. Default to length of data. -->
    <xsl:param name="length" select="string-length($data)"/>
    <!-- More link -->
    <xsl:param name="link"/>

    <xsl:choose>
        <!-- Return whole data if it's within length. -->
        <xsl:when test="string-length($data) <= $length">
            <xsl:copy-of select="$data" />
        </xsl:when>
        <!-- Truncate to desired length. -->
        <xsl:otherwise>
            <xsl:for-each select="$data/*">
                <xsl:variable name="this-node" select="string-length(.)"/>
                <xsl:variable name="preceding-nodes">
                    <xsl:copy-of select="preceding-sibling::*"/>
                </xsl:variable>
                <xsl:variable name="node-sum" select="string-length(normalize-space($preceding-nodes))"/>
                <xsl:variable name="limit" select="$node-sum + $this-node"/>

                <xsl:choose>
                    <xsl:when test="$limit > $length and $node-sum <= $length">
                        <p>
                        <xsl:value-of select="substring(.,1,$length - $node-sum)"/>
                        <xsl:text>…</xsl:text>
                        <a>
                            <xsl:attribute name="href">
                                <xsl:value-of select="$link"/>
                            </xsl:attribute>
                            <xsl:text>more</xsl:text>
                        </a>
                        </p>
                    </xsl:when>
                    <xsl:when test="$limit < $length">
                        <xsl:copy-of select="."/>
                    </xsl:when>
                    <xsl:otherwise/>
                </xsl:choose>

            </xsl:for-each>
        </xsl:otherwise>
    </xsl:choose>

</xsl:template>

</xsl:stylesheet>

I would use the solution by Chaotic Pattern though, it's more elegant ;-)

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清旖 2024-07-20 14:31:41

这将是使用 XSLT 的一个痛苦插曲。我强烈建议使用 Perl/Python 等脚本语言来尝试此操作。

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肥爪爪 2024-07-20 14:31:40

这是我的版本。我已经在您的 XML 示例上对其进行了测试，并且它有效。

要调用它，请使用。

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

<xsl:strip-space elements="*"/>

<!-- limit: the truncation limit -->
<xsl:variable name="limit" select="250"/>

<!-- t: Total number of characters in the set -->
<xsl:variable name="t" select="string-length(normalize-space(//body))"/>

<xsl:template match="*" mode="truncate">
    <xsl:variable name="preceding-strings">
        <xsl:copy-of select="preceding::text()[ancestor::body]"/>
    </xsl:variable>

    <!-- p: number of characters up to the current node -->
    <xsl:variable name="p" select="string-length(normalize-space($preceding-strings))"/>

    <xsl:if test="$p < $limit">
        <xsl:element name="{name()}">
            <xsl:apply-templates select="@*" mode="truncate"/>
            <xsl:apply-templates mode="truncate"/>
        </xsl:element>
    </xsl:if>
</xsl:template>

<xsl:template match="text()" mode="truncate">
    <xsl:variable name="preceding-strings">
        <xsl:copy-of select="preceding::text()[ancestor::body]"/>
    </xsl:variable>

    <!-- p: number of characters up to the current node -->
    <xsl:variable name="p" select="string-length(normalize-space($preceding-strings))"/>

    <!-- c: number of characters including current node -->
    <xsl:variable name="c" select="$p + string-length(.)"/>

    <xsl:choose>
        <xsl:when test="$limit <= $c">
            <xsl:value-of select="substring(., 1, ($limit - $p))"/>
            <xsl:text>…</xsl:text>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="."/>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>

<xsl:template match="@*" mode="truncate">
    <xsl:attribute name="{name(.)}"><xsl:value-of select="."/></xsl:attribute>
</xsl:template>

</xsl:stylesheet>

Here's my version. I've tested it over your XML sample and it works.

To invoke it, use <xsl:apply-templates select="path/to/body/*" mode="truncate"/>.

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

<xsl:strip-space elements="*"/>

<!-- limit: the truncation limit -->
<xsl:variable name="limit" select="250"/>

<!-- t: Total number of characters in the set -->
<xsl:variable name="t" select="string-length(normalize-space(//body))"/>

<xsl:template match="*" mode="truncate">
    <xsl:variable name="preceding-strings">
        <xsl:copy-of select="preceding::text()[ancestor::body]"/>
    </xsl:variable>

    <!-- p: number of characters up to the current node -->
    <xsl:variable name="p" select="string-length(normalize-space($preceding-strings))"/>

    <xsl:if test="$p < $limit">
        <xsl:element name="{name()}">
            <xsl:apply-templates select="@*" mode="truncate"/>
            <xsl:apply-templates mode="truncate"/>
        </xsl:element>
    </xsl:if>
</xsl:template>

<xsl:template match="text()" mode="truncate">
    <xsl:variable name="preceding-strings">
        <xsl:copy-of select="preceding::text()[ancestor::body]"/>
    </xsl:variable>

    <!-- p: number of characters up to the current node -->
    <xsl:variable name="p" select="string-length(normalize-space($preceding-strings))"/>

    <!-- c: number of characters including current node -->
    <xsl:variable name="c" select="$p + string-length(.)"/>

    <xsl:choose>
        <xsl:when test="$limit <= $c">
            <xsl:value-of select="substring(., 1, ($limit - $p))"/>
            <xsl:text>…</xsl:text>
        </xsl:when>
        <xsl:otherwise>
            <xsl:value-of select="."/>
        </xsl:otherwise>
    </xsl:choose>
</xsl:template>

<xsl:template match="@*" mode="truncate">
    <xsl:attribute name="{name(.)}"><xsl:value-of select="."/></xsl:attribute>
</xsl:template>

</xsl:stylesheet>

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