--- /dev/null
+<?xml version='1.0' encoding='UTF-8' ?>
+<!--
+ Nick's web site: SVG embedding.
+
+ Copyright © 2021 Nick Bowler
+
+ This program is free software: you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation, either version 3 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program. If not, see <https://www.gnu.org/licenses/>
+-->
+<xsl:stylesheet version='1.0'
+ xmlns='http://www.w3.org/1999/xhtml'
+ xmlns:cc='http://creativecommons.org/ns#'
+ xmlns:dc='http://purl.org/dc/elements/1.1/'
+ xmlns:f='http://draconx.ca/my-functions'
+ xmlns:rdf='http://www.w3.org/1999/02/22-rdf-syntax-ns#'
+ xmlns:svg="http://www.w3.org/2000/svg"
+ xmlns:xhtml='http://www.w3.org/1999/xhtml'
+ xmlns:xlink='http://www.w3.org/1999/xlink'
+ xmlns:xsl='http://www.w3.org/1999/XSL/Transform'
+ extension-element-prefixes="f"
+ exclude-result-prefixes="cc dc rdf xhtml">
+
+<xsl:import href='layouts/functions.xsl' />
+<xsl:output cdata-section-elements='style script' />
+<xsl:strip-space elements='xhtml:html xhtml:body' />
+
+<xsl:key name='embed-svg' match='//xhtml:img[f:ends-with(@src, ".svg")]'
+ use='@src' />
+
+<xsl:key name='id' match='//*[@id]' use='@id' />
+
+<xsl:template match='node()|@*'>
+ <xsl:copy>
+ <xsl:apply-templates select='node()|@*' />
+ </xsl:copy>
+</xsl:template>
+
+<!-- force a literal result to ensure html gets all namespace nodes -->
+<xsl:template name='rewrite-html'>
+ <html>
+ <xsl:apply-templates select='node()|@*' />
+ </html>
+</xsl:template>
+
+<xsl:template match='/xhtml:html'>
+ <xsl:choose>
+ <xsl:when test='//xhtml:img[key("embed-svg", @src)]'>
+ <xsl:call-template name='rewrite-html' />
+ </xsl:when>
+ <xsl:otherwise>
+ <xsl:element name='{name()}' namespace='{namespace-uri()}'>
+ <xsl:apply-templates select='node()|@*' />
+ </xsl:element>
+ </xsl:otherwise>
+ </xsl:choose>
+</xsl:template>
+
+<xsl:template match='xhtml:img[key("embed-svg", @src)]'>
+ <span class='svg'>
+ <xsl:apply-templates select='@style' />
+ <svg:svg>
+ <xsl:apply-templates select='@width|@height' />
+ <svg:switch>
+ <svg:use xlink:href='#es-{generate-id(key("embed-svg", @src))}' />
+ <svg:foreignObject width='0' height='0'>
+ <!-- TODO: this hardcoded fallback method needs to be more flexible -->
+ <xsl:copy>
+ <xsl:attribute name='src'>
+ <xsl:value-of select='substring-before(@src, ".svg")' />
+ <xsl:text>-32.png</xsl:text>
+ </xsl:attribute>
+ <xsl:attribute name='class'>svgfallback</xsl:attribute>
+ <xsl:apply-templates select='node()|
+ @*[not(contains("src style class", local-name()))]' />
+ </xsl:copy>
+ </svg:foreignObject>
+ </svg:switch>
+ </svg:svg>
+ </span>
+</xsl:template>
+
+<!-- SVG embedding -->
+<xsl:template mode='embed-svg' match='node()|@*'>
+ <xsl:copy>
+ <xsl:apply-templates select='node()|@*' />
+ </xsl:copy>
+</xsl:template>
+
+<!-- Remove all whitespace-only text nodes from embedded SVG -->
+<xsl:template mode='embed-svg' match='text()[normalize-space(.) = ""]' />
+
+<xsl:template name='svgnode' mode='embed-svg' match='svg:*'>
+ <xsl:param name='idnode' select='.' />
+
+ <!-- doctype demands svg: prefix -->
+ <xsl:element name='svg:{local-name()}' namespace='{namespace-uri()}'>
+ <!-- rewrite all id nodes to avoid conflicts with other embeddings -->
+ <xsl:if test='@id or not(parent::*)'>
+ <xsl:attribute name='id'>
+ <xsl:value-of select='concat("es-", generate-id($idnode))' />
+ </xsl:attribute>
+ </xsl:if>
+ <xsl:apply-templates mode='embed-svg' select='@*[local-name()!="id"]' />
+ <xsl:apply-templates mode='embed-svg' select='node()'>
+ <xsl:sort select='-count(self::svg:metadata)' data-type='number' />
+ </xsl:apply-templates>
+ </xsl:element>
+</xsl:template>
+
+<xsl:template name='depx'>
+ <xsl:param name='node' select='.' />
+ <xsl:choose>
+ <xsl:when test='contains($node, "px")'>
+ <xsl:value-of select='substring-before($node, "px")' />
+ </xsl:when>
+ <xsl:otherwise>
+ <xsl:value-of select='node' />
+ </xsl:otherwise>
+ </xsl:choose>
+</xsl:template>
+
+<xsl:template mode='embed-svg' match='/svg:svg/@width[../@height]'>
+ <xsl:attribute name='viewBox'>
+ <xsl:text>0 0 </xsl:text>
+ <xsl:call-template name='depx' />
+ <xsl:text> </xsl:text>
+ <xsl:call-template name='depx'>
+ <xsl:with-param name='node' select='../@height' />
+ </xsl:call-template>
+ </xsl:attribute>
+</xsl:template>
+<xsl:template mode='embed-svg' match='/svg:svg/@height[../@width]' />
+
+<!--
+ the RDF stuff is disallowed by doctype, try and transform to an
+ attribution comment.
+-->
+<xsl:template mode='embed-svg' match='svg:metadata'>
+ <xsl:if test='descendant::cc:Work'>
+ <xsl:comment>
+ <xsl:apply-templates select='descendant::cc:Work' />
+ </xsl:comment>
+ </xsl:if>
+</xsl:template>
+
+<!-- hackjob to stringify the work info -->
+<xsl:template match='cc:Work'>
+ <xsl:text>
+ </xsl:text>
+ <xsl:if test='dc:title'>
+ <xsl:value-of select='concat("“", dc:title, "”")' />
+ </xsl:if>
+ <xsl:if test='dc:creator/cc:Agent'>
+ <xsl:text> by </xsl:text>
+ <xsl:for-each select='dc:creator/cc:Agent'>
+ <xsl:value-of select='dc:title' />
+ <xsl:choose>
+ <xsl:when test='position()=last()'>
+ <xsl:text>.</xsl:text>
+ </xsl:when>
+ <xsl:otherwise>
+ <xsl:text>, </xsl:text>
+ </xsl:otherwise>
+ </xsl:choose>
+ </xsl:for-each>
+ </xsl:if>
+ <xsl:if test='dc:source'>
+ <xsl:text>
+ </xsl:text>
+ <xsl:value-of select='dc:source' />
+ </xsl:if>
+ <xsl:if test='cc:license/@rdf:resource'>
+ <xsl:text>
+ </xsl:text>
+ <xsl:value-of select='cc:license/@rdf:resource' />
+ </xsl:if>
+ <xsl:text>
+</xsl:text>
+</xsl:template>
+
+<!-- match all xlink:href attributes to generated IDs for this document -->
+<xsl:template mode='embed-svg' match='@xlink:href[starts-with(.,"#")]'>
+ <xsl:variable name='ref' select='substring-after(., "#")' />
+
+ <xsl:attribute name='xlink:href'>
+ <xsl:value-of select='concat("#es-", generate-id(key("id", $ref)))' />
+ </xsl:attribute>
+</xsl:template>
+
+<!-- rewrite all attributes containing url(#id) to generated IDs -->
+<xsl:template name='rewrite-urls'>
+ <xsl:param name='val' select='.' />
+
+ <xsl:choose>
+ <xsl:when test='contains($val, "url(#")'>
+ <xsl:variable name='tail' select='substring-after($val, "url(#")' />
+ <xsl:variable name='ref' select='substring-before($tail, ")")' />
+
+ <xsl:value-of select='substring-before($val, "url(#")' />
+ <xsl:text>url(</xsl:text>
+ <xsl:value-of select='concat("#es-", generate-id(key("id", $ref)))' />
+ <xsl:text>)</xsl:text>
+ <xsl:call-template name='rewrite-urls'>
+ <xsl:with-param name='val' select='substring-after($tail, ")")' />
+ </xsl:call-template>
+ </xsl:when>
+ <xsl:otherwise>
+ <xsl:value-of select='$val' />
+ </xsl:otherwise>
+ </xsl:choose>
+</xsl:template>
+
+<xsl:template mode='embed-svg' match='@*[contains(., "url(#")]'>
+ <xsl:attribute name='{name()}'>
+ <xsl:call-template name='rewrite-urls' />
+ </xsl:attribute>
+</xsl:template>
+
+<xsl:template match='xhtml:body'>
+ <xsl:copy>
+ <xsl:apply-templates select='node()|@*' />
+ <xsl:if test='key("embed-svg", //xhtml:img/@src)'>
+ <script type='x'><![CDATA[]]x><!--]]></script>
+ <svg:svg width='0' height='0'>
+ <svg:defs>
+ <xsl:for-each select='//xhtml:img'>
+ <xsl:if test='generate-id(.)=generate-id(key("embed-svg", @src))'>
+ <xsl:apply-templates mode='embed-svg'
+ select='document(concat("output", @src))'>
+ <xsl:with-param name='idnode' select='.' />
+ </xsl:apply-templates>
+ </xsl:if>
+ </xsl:for-each>
+ </svg:defs>
+ </svg:svg>
+ <script type='x'>--></script>
+ </xsl:if>
+ </xsl:copy>
+</xsl:template>
+
+</xsl:stylesheet>
projects / homepage.git / blobdiff