Subject: Re: [xsl] most efficient flat file listing to hierarchical From: "Andrew Welch" <andrew.j.welch@xxxxxxxxx> Date: Thu, 11 Jan 2007 10:26:00 +0000 |
Hello All,
Can anyone propose a pure xslt (1 or 2) solution to transforming the following flat xml structure of directory paths into a hierarchical (nested) xml.
<?xml version='1.0'?> <listing> <item>cn/test.xml</item> <item>en</item> <item>en/test.html</item> <item>en/test1.html</item> <item>en/resource</item> <item>en/resource/style</item> <item>en/resource/style/test.css</item> <item>favicon.ico</item> <item>cn</item> </listing>
to
<dir> <file name="favicon.ico"/> <dir name="cn"> <file name="test.xml"/> </dir> <dir name="en"> <file name="test.html"/> <file name="test1.html"/> <dir name="resource"> <dir name="style"> <file name="test.css"/> </dir> </dir> </dir> </dir>
<xsl:stylesheet version="2.0" xmlns:xs="http://www.w3.org/2001/XMLSchema" xmlns:xsl="http://www.w3.org/1999/XSL/Transform" exclude-result-prefixes="xs">
<xsl:template match="listing"> <dir> <xsl:call-template name="process"> <xsl:with-param name="depth" select="1" as="xs:integer"/> <xsl:with-param name="seq" select="item"/> </xsl:call-template> </dir> </xsl:template>
<xsl:template name="process"> <xsl:param name="depth" as="xs:integer"/> <xsl:param name="seq"/> <xsl:for-each-group select="$seq" group-by="tokenize(., '/')[$depth]"> <xsl:variable name="part" select="tokenize(., '/')[$depth]"/> <xsl:choose> <xsl:when test="contains($part, '.')"> <file name="{$part}"/> </xsl:when> <xsl:otherwise> <dir name="{$part}"> <xsl:call-template name="process"> <xsl:with-param name="depth" select="$depth + 1"/> <xsl:with-param name="seq" select="$seq[tokenize(., '/')[$depth] = $part]"/> </xsl:call-template> </dir> </xsl:otherwise> </xsl:choose> </xsl:for-each-group> </xsl:template>
<dir> <dir name="cn"> <file name="test.xml"/> </dir> <dir name="en"> <file name="test.html"/> <file name="test1.html"/> <dir name="resource"> <dir name="style"> <file name="test.css"/> </dir> </dir> </dir> <file name="favicon.ico"/> </dir>
cheers andrew
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