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Truncates by character limit while gracefully retains HTML elements.
<?xml version='1.0' encoding='utf-8'?>
<xsl:stylesheet version="1.0" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" xmlns:exsl="http://exslt.org/common" extension-element-prefixes="exsl">
<!--
Author: Allen Chang
Version: 1.1
Description: Truncates by character limit while gracefully retains HTML
Usage: <xsl:apply-templates select="path/to/your/body" mode="truncate"/>
-->
<xsl:strip-space elements="*"/>
<xsl:template match="body" mode="truncate">
<xsl:param name="limit" select="250"/>
<xsl:param name="suffix" select="'&#8230;'"/>
<xsl:variable name="body">
<xsl:copy-of select="*"/>
</xsl:variable>
<xsl:apply-templates select="exsl:node-set($body)/*" mode="truncate">
<xsl:with-param name="limit" select="$limit"/>
<xsl:with-param name="suffix" select="$suffix"/>
</xsl:apply-templates>
</xsl:template>
<xsl:template match="*" mode="truncate">
<xsl:param name="limit"/>
<xsl:param name="suffix"/>
<xsl:variable name="preceding-strings">
<xsl:copy-of select="preceding::text()"/>
</xsl:variable>
<!-- p: number of characters up to the current node -->
<xsl:variable name="p" select="string-length(normalize-space($preceding-strings))"/>
<xsl:if test="$p &lt; $limit">
<xsl:element name="{name()}">
<xsl:apply-templates mode="truncate">
<xsl:with-param name="limit" select="$limit"/>
<xsl:with-param name="suffix" select="$suffix"/>
</xsl:apply-templates>
</xsl:element>
</xsl:if>
</xsl:template>
<xsl:template match="text()" mode="truncate">
<xsl:param name="limit"/>
<xsl:param name="suffix"/>
<xsl:variable name="preceding-strings">
<xsl:copy-of select="preceding::text()"/>
</xsl:variable>
<!-- p: number of characters up to the current node -->
<xsl:variable name="p" select="string-length(normalize-space($preceding-strings))"/>
<!-- c: number of characters including current node -->
<xsl:variable name="c" select="$p + string-length(.)"/>
<xsl:choose>
<xsl:when test="$limit &lt;= $c">
<xsl:value-of select="substring(., 1, ($limit - $p))"/>
<xsl:value-of select="$suffix"/>
</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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