<?xml version='1.0'?>

<!--********************************************************************
Copyright (C) 2014-2026  Robert A. Beezer

This file is part of PreTeXt.

PreTeXt is free software: you can redistribute it and/or modify
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PreTeXt is distributed in the hope that it will be useful,
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*********************************************************************-->

<!-- This stylesheet locates video/@youtube elements and -->
<!-- prepares a Python dictionary necessary to extract a -->
<!-- thumbnail for each video from the YouTube servers   -->

<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform" version="1.0"
    xmlns:xml="http://www.w3.org/XML/1998/namespace"
    xmlns:exsl="http://exslt.org/common"
    xmlns:str="http://exslt.org/strings"
    extension-element-prefixes="exsl"
>

<!-- Get internal ID's for filenames, etc -->
<!-- Standard conversion groundwork       -->
<xsl:import href="./publisher-variables.xsl"/>
<xsl:import href="./pretext-assembly.xsl"/>
<xsl:import href="./pretext-common.xsl"/>

<!-- Get a "subtree" xml:id value   -->
<!-- Then walk the XML source tree  -->
<!-- applying specializations below -->
<xsl:import href="./extract-identity.xsl" />

<xsl:output method="text" encoding="UTF-8"/>

<xsl:template match="mermaid" mode="extraction">
    <xsl:variable name="filebase">
        <xsl:apply-templates select="." mode="image-source-basename"/>
    </xsl:variable>

    <exsl:document href="{$filebase}.mmd" method="text">
        <xsl:call-template name="sanitize-text">
            <xsl:with-param name="text" select="." />
        </xsl:call-template>
    </exsl:document>
</xsl:template>

</xsl:stylesheet>
