使用XSLT截断XML [英] Truncate XML with XSLT
问题描述
我对SO社区的聪明人有疑问.
I have a question for the clever people of the SO community.
下面是 Symphony CMS 生成的XML代码段.
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>
我需要做的是根据指定的长度获取<body>元素的一部分，以博客样式显示:
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坐在amet， 奉献的精英人士.塞德 Malesuada auctor magna.乌iva 贾斯托，新的pulvinar，矢状 马累苏达，Accumsan，马萨. Quisque mi purus，grave eget，ultricies a， 进入游戏中，开始... 更多
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
...其中，更多是完整新闻项的链接.我知道我可以选择特定的段落，也可以使用substring函数带来指定数量的字符.但是，我需要保留文本的格式，即<body>元素内的HTML标签.
...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.
我意识到这引发了标签关闭的问题，但是肯定有一种方法.希望对XSLT更有经验的人可以对这个问题有所了解.
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.
推荐答案
这是我的版本.我已经在您的XML示例中对其进行了测试，并且可以正常工作.
Here's my version. I've tested it over your XML sample and it works.
要调用它，请使用<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>
这篇关于使用XSLT截断XML的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
