Revamped transformation layout to remove need for the "01_files" level

* "01_files" contained a single "source" transformation which listed the contents of the "00_content" level
** this was unnecessary as the base "list" transformation already lists the contents of all levels
* added new "expression" mode to datasource meta tag processing in the task processing transformation
** this expression modes allows for the evaluation of arbitrary XPath statements
*** e.g. a query to the results of "list.xsl"
* modified base transformation datasource structures to include the level and meta tree
* modified all existing content transformations to query the level-tree instead of the deprecated "source.xml"
** i.e. XPath statements
** the main change is that directories are available as "directory" nodes instead of nodes named by the directory name
* these changes where implemented to simplify the architecture and to increase flexibility

1 files changed, 45 insertions, 0 deletions

diff --git a/source/02_meta/categories.xsl b/source/02_meta/categories.xsl
new file mode 100644
index 0000000..c0075b0
--- /dev/null
+++ b/source/02_meta/categories.xsl
@@ -0,0 +1,45 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<xsl:stylesheet
+	version="1.0"
+	xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
+	xmlns:xalan="http://xml.apache.org/xalan"
+	xmlns:InputXSLT="function.inputxslt.application"
+	exclude-result-prefixes="xalan InputXSLT"
+>
+
+<xsl:include href="[utility/datasource.xsl]"/>
+
+<xsl:variable name="meta">
+	<datasource type="main"  mode="expression" source="$root/source/directory[1]/directory" target="files"/>
+	<datasource type="support" mode="full" source="01_data/pages.xml"   target="pages"/>
+	<target     mode="plain"   value="categories.xml"/> 
+</xsl:variable>
+
+<xsl:template name="get_page_data">
+	<xsl:param name="handle"/>
+
+	<xsl:variable name="page" select="$root/pages/entry[@handle = $handle]"/>
+
+	<page handle="{$handle}">
+		<title>
+			<xsl:value-of select="$page/title"/>
+		</title>
+		<digest size="{string-length($page/content/p[1])}">
+			<xsl:copy-of select="$page/content/p[1]/node()"/>
+		</digest>
+	</page>
+</xsl:template>
+
+<xsl:template match="files/directory[@name = 'pages']/directory">
+	<entry handle="{@name}">
+		<xsl:apply-templates />
+	</entry>
+</xsl:template>
+
+<xsl:template match="files/directory[@name = 'pages']/*/file[@extension = '.md']">
+	<xsl:call-template name="get_page_data">
+		<xsl:with-param name="handle" select="@name"/>
+	</xsl:call-template>
+</xsl:template>
+
+</xsl:stylesheet>