]> Lady’s Gitweb - Shrine-XSLT/blobdiff - transform.xslt
Basic support for Atom feeds
[Shrine-XSLT] / transform.xslt
index 0919121f56192ea1934cd58726d8f19c7db478df..20fe4c29b354fa5166cba66c9a17e9c3647f2829 100644 (file)
@@ -23,10 +23,41 @@ This Source Code Form is subject to the terms of the Mozilla Public License, v.
 If a copy of the MPL was not distributed with this file, You can obtain one at https://mozilla.org/MPL/2.0/.
 -->
 <xslt:transform
+       xmlns:atom="http://www.w3.org/2005/Atom"
        xmlns:html="http://www.w3.org/1999/xhtml"
        xmlns:xslt="http://www.w3.org/1999/XSL/Transform"
        version="1.0"
 >
+       <xslt:param name="BASEIRI" select="'http://example.com'"/>
+       <xslt:param name="DATETIME" select="'1972-12-31T00:00:00Z'"/>
+       <xslt:param name="OUTPUTPATH" select="'/unknown'"/>
+       <xslt:variable name="baseiri">
+               <xslt:choose>
+                       <xslt:when test="contains($BASEIRI, '://')"> <!-- there is an authority -->
+                               <xslt:variable name="noscheme" select="substring-after($BASEIRI, '://')"/>
+                               <xslt:value-of select="substring-before($BASEIRI, '://')"/>
+                               <xslt:text>://</xslt:text>
+                               <xslt:choose>
+                                       <xslt:when test="contains($noscheme, '/')">
+                                               <xslt:value-of select="substring-before($noscheme, '/')"/>
+                                       </xslt:when>
+                                       <xslt:otherwise>
+                                               <xslt:value-of select="$noscheme"/>
+                                       </xslt:otherwise>
+                               </xslt:choose>
+                       </xslt:when>
+                       <xslt:otherwise>
+                               <xslt:value-of select="substring-before($BASEIRI, ':')"/>
+                       </xslt:otherwise>
+               </xslt:choose>
+       </xslt:variable>
+       <xslt:variable name="datetime" select="string($DATETIME)"/>
+       <xslt:variable name="outputpath">
+               <xslt:if test="not(starts-with($OUTPUTPATH, '/'))">
+                       <xslt:text>/</xslt:text>
+               </xslt:if>
+               <xslt:value-of select="$OUTPUTPATH"/>
+       </xslt:variable>
        <xslt:variable name="source" select="current()"/>
        <xslt:variable name="template" select="document('./template.xml')"/>
 
@@ -34,7 +65,14 @@ If a copy of the MPL was not distributed with this file, You can obtain one at h
                Instead of actually processing the root node, process the template in `template` mode.
        -->
        <xslt:template match="/">
-               <xslt:apply-templates select="$template" mode="template"/>
+               <xslt:choose>
+                       <xslt:when test="atom:feed">
+                               <xslt:apply-templates mode="feed"/>
+                       </xslt:when>
+                       <xslt:otherwise>
+                               <xslt:apply-templates select="$template" mode="template"/>
+                       </xslt:otherwise>
+               </xslt:choose>
        </xslt:template>
 
        <!--
@@ -122,6 +160,7 @@ If a copy of the MPL was not distributed with this file, You can obtain one at h
                                        <xslt:apply-templates select="$source//html:h1" mode="text"/>
                                </title>
                        </xslt:if>
+                       <meta name="generator" content="https://github.com/marrus-sh/shrine-xslt"/>
                        <xslt:apply-templates mode="template"/>
                        <xslt:for-each select="$source//*[@slot='shrine-head']">
                                <xslt:apply-templates select="." mode="content"/>
@@ -158,6 +197,135 @@ If a copy of the MPL was not distributed with this file, You can obtain one at h
                <xslt:apply-templates select="$source/*" mode="content"/>
        </xslt:template>
 
+       <!--
+               Process feed elements and text.
+               By default, just make a copy.
+               This behaviour will be overridden for certain elements to generate feed metadata.
+       -->
+       <xslt:template match="*|text()" mode="feed">
+               <xslt:copy>
+                       <xslt:for-each select="@*">
+                               <xslt:copy/>
+                       </xslt:for-each>
+                       <xslt:apply-templates mode="feed"/>
+               </xslt:copy>
+       </xslt:template>
+
+       <!--
+               Process the root feed element.
+               This adds required metadata when it has not been provided in the source X·M·L.
+       -->
+       <xslt:template match="atom:feed" mode="feed">
+               <xslt:text>&#x0A;</xslt:text> <!-- ensure a newline between the doctype and the feed element -->
+               <feed xmlns="http://www.w3.org/2005/Atom">
+                       <xslt:for-each select="@*">
+                               <xslt:copy/>
+                       </xslt:for-each>
+                       <xslt:apply-templates select="text()[following-sibling::*[not(self::atom:entry)]]|*[not(self::atom:entry)]" mode="feed"/>
+                       <xslt:if test="not(atom:id)">
+                               <xslt:text>&#x0A;&#x09;</xslt:text>
+                               <id>
+                                       <xslt:choose>
+                                               <xslt:when test="contains($baseiri, '://')">
+                                                       <xslt:text>oai:</xslt:text>
+                                                       <xslt:value-of select="substring-after($baseiri, '://')"/>
+                                                       <xslt:text>:</xslt:text>
+                                               </xslt:when>
+                                               <xslt:otherwise>
+                                                       <xslt:value-of select="$baseiri"/>
+                                                       <xslt:text>/</xslt:text>
+                                               </xslt:otherwise>
+                                       </xslt:choose>
+                                       <xslt:value-of select="$outputpath"/>
+                               </id>
+                       </xslt:if>
+                       <xslt:if test="not(atom:title)">
+                               <xslt:text>&#x0A;&#x09;</xslt:text>
+                               <title xml:lang="en">Untitled</title>
+                       </xslt:if>
+                       <xslt:if test="not(atom:author)">
+                               <xslt:text>&#x0A;&#x09;</xslt:text>
+                               <author>
+                                       <name xml:lang="en">Anonymous</name>
+                               </author>
+                       </xslt:if>
+                       <xslt:if test="not(atom:link[@rel='alternate'][@type='text/html'])">
+                               <xslt:text>&#x0A;&#x09;</xslt:text>
+                               <link rel="alternate" type="text/html" href="{$baseiri}/"/>
+                       </xslt:if>
+                       <xslt:if test="not(atom:link[@rel='self'])">
+                               <xslt:text>&#x0A;&#x09;</xslt:text>
+                               <link rel="self" type="application/atom+xml" href="{$baseiri}{$outputpath}"/>
+                       </xslt:if>
+                       <xslt:if test="not(atom:updated)">
+                               <xslt:text>&#x0A;&#x09;</xslt:text>
+                               <updated>
+                                       <xslt:value-of select="$datetime"/>
+                               </updated>
+                       </xslt:if>
+                       <xslt:if test="not(atom:generator)">
+                               <xslt:text>&#x0A;&#x09;</xslt:text>
+                               <generator uri="https://github.com/marrus-sh/shrine-xslt">shrine-xslt</generator>
+                       </xslt:if>
+                       <xslt:apply-templates select="atom:entry" mode="feed"/>
+                       <xslt:text>&#x0A;</xslt:text> <!-- newline before close tag -->
+               </feed>
+       </xslt:template>
+
+       <!--
+               Process feed entry elements.
+       -->
+       <xslt:template match="atom:entry[atom:link[@rel='alternate'][starts-with(@href, '/')][@type='text/html']]" mode="feed">
+               <xslt:variable name="entryhref" select="atom:link[@rel='alternate'][starts-with(@href, '/')][@type='text/html'][1]/@href"/>
+               <xslt:text>&#x0A;&#x09;</xslt:text>
+               <entry xmlns="http://www.w3.org/2005/Atom">
+                       <xslt:for-each select="@*">
+                               <xslt:copy/>
+                       </xslt:for-each>
+                       <xslt:apply-templates select="text()[following-sibling::*]|*" mode="feed"/>
+                       <xslt:if test="not(atom:id)">
+                               <xslt:text>&#x0A;&#x09;&#x09;</xslt:text>
+                               <id>
+                                       <xslt:choose>
+                                               <xslt:when test="contains($baseiri, '://')">
+                                                       <xslt:text>oai:</xslt:text>
+                                                       <xslt:value-of select="substring-after($baseiri, '://')"/>
+                                                       <xslt:text>:</xslt:text>
+                                               </xslt:when>
+                                               <xslt:otherwise>
+                                                       <xslt:value-of select="$baseiri"/>
+                                                       <xslt:text>/</xslt:text>
+                                               </xslt:otherwise>
+                                       </xslt:choose>
+                                       <xslt:value-of select="$entryhref"/>
+                               </id>
+                       </xslt:if>
+                       <xslt:if test="not(atom:title)">
+                               <xslt:text>&#x0A;&#x09;&#x09;</xslt:text>
+                               <title xml:lang="en">Untitled</title>
+                       </xslt:if>
+                       <xslt:if test="not(atom:updated)">
+                               <xslt:text>&#x0A;&#x09;&#x09;</xslt:text>
+                               <updated>
+                                       <xslt:value-of select="$datetime"/>
+                               </updated>
+                       </xslt:if>
+                       <xslt:text>&#x0A;&#x09;</xslt:text> <!-- newline before close tag -->
+               </entry>
+       </xslt:template>
+
+       <!--
+               Process feed link elements.
+               This simply rewrites absolute links to be relative.
+       -->
+       <xslt:template match="atom:link[starts-with(@href, '/')]" mode="feed">
+               <link xmlns="http://www.w3.org/2005/Atom" rel="{@rel}" href="{$baseiri}{@href}">
+                       <xslt:for-each select="@*[local-name()!='rel' and local-name()!='href']">
+                               <xslt:copy/>
+                       </xslt:for-each>
+               </link>
+       </xslt:template>
+
        <!--
                Provide the complete text content of the provided element.
        -->
@@ -173,7 +341,9 @@ If a copy of the MPL was not distributed with this file, You can obtain one at h
        </xslt:template>
 
        <!--
-               Set the output mode to HTML.
+               Set up output.
+               Note that this relies on “default” output method detection specified in X·S·L·T in order to work.
+               The `about:legacy-compat` system doctype is for H·T·M·L compatibility but is harmless in X·M·L.
        -->
-       <xslt:output method="html" charset="UTF-8" doctype-system="about:legacy-compat" indent="no"/>
+       <xslt:output charset="UTF-8" doctype-system="about:legacy-compat" indent="no"/>
 </xslt:transform>
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