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Disallow h7 headings in output (force-limit to h6) #13

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Merged
glenfe merged 1 commit into from
Feb 28, 2022
Merged

Disallow h7 headings in output (force-limit to h6) #13

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1 change: 1 addition & 0 deletions xsl/html.xsl
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Original file line number Diff line number Diff line change
Expand Up @@ -33,5 +33,6 @@
<xsl:include href="relative-href.xsl"/>
<xsl:include href="callout.xsl"/>
<xsl:include href="html-base.xsl"/>
<xsl:include href="sections.xsl"/>

</xsl:stylesheet>
117 changes: 117 additions & 0 deletions xsl/sections.xsl
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@@ -0,0 +1,117 @@
<!--
Copyright (c) 2022 Evan Lenz <[email protected]>

Distributed under the Boost Software License, Version 1.0.
(See accompanying file LICENSE_1_0.txt or copy at
http://www.boost.org/LICENSE_1_0.txt)
-->
<xsl:stylesheet
xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
version="1.0">

<!--
This addresses a bug in the DocBook stylesheets that causes
<h7> or <h8> to appear in the output; it forces such headings
to be <h6> (the highest valid heading element in HTML).

The rule below is copied verbatim from DocBook's html/sections.xsl
with the exception of the called-out part below.
-->
<xsl:template match="bridgehead">
<xsl:variable name="container"
select="(ancestor::appendix
|ancestor::article
|ancestor::bibliography
|ancestor::chapter
|ancestor::glossary
|ancestor::glossdiv
|ancestor::index
|ancestor::partintro
|ancestor::preface
|ancestor::refsect1
|ancestor::refsect2
|ancestor::refsect3
|ancestor::sect1
|ancestor::sect2
|ancestor::sect3
|ancestor::sect4
|ancestor::sect5
|ancestor::section
|ancestor::setindex
|ancestor::simplesect)[last()]"/>

<xsl:variable name="clevel">
<xsl:choose>
<xsl:when test="local-name($container) = 'appendix'
or local-name($container) = 'chapter'
or local-name($container) = 'article'
or local-name($container) = 'bibliography'
or local-name($container) = 'glossary'
or local-name($container) = 'index'
or local-name($container) = 'partintro'
or local-name($container) = 'preface'
or local-name($container) = 'setindex'">1</xsl:when>
<xsl:when test="local-name($container) = 'glossdiv'">
<xsl:value-of select="count(ancestor::glossdiv)+1"/>
</xsl:when>
<xsl:when test="local-name($container) = 'sect1'
or local-name($container) = 'sect2'
or local-name($container) = 'sect3'
or local-name($container) = 'sect4'
or local-name($container) = 'sect5'
or local-name($container) = 'refsect1'
or local-name($container) = 'refsect2'
or local-name($container) = 'refsect3'
or local-name($container) = 'section'
or local-name($container) = 'simplesect'">
<xsl:variable name="slevel">
<xsl:call-template name="section.level">
<xsl:with-param name="node" select="$container"/>
</xsl:call-template>
</xsl:variable>
<xsl:value-of select="$slevel + 1"/>
</xsl:when>
<xsl:otherwise>1</xsl:otherwise>
</xsl:choose>
</xsl:variable>

<!-- HTML H level is one higher than section level -->
<xsl:variable name="hlevel">
<xsl:choose>
<xsl:when test="@renderas = 'sect1'">2</xsl:when>
<xsl:when test="@renderas = 'sect2'">3</xsl:when>
<xsl:when test="@renderas = 'sect3'">4</xsl:when>
<xsl:when test="@renderas = 'sect4'">5</xsl:when>
<xsl:when test="@renderas = 'sect5'">6</xsl:when>
<xsl:otherwise>
<!-- ====================================================== -->
<!-- == START: BoostBook-specific fix ===================== -->
<!-- ====================================================== -->
<xsl:choose>
<xsl:when test="$clevel >= 6">6</xsl:when>
<xsl:otherwise>
<xsl:value-of select="$clevel + 1"/>
</xsl:otherwise>
</xsl:choose>
<!--
<xsl:value-of select="$clevel + 1"/>
-->
<!-- ====================================================== -->
<!-- == END: BoostBook-specific fix ======================= -->
<!-- ====================================================== -->
</xsl:otherwise>
</xsl:choose>
</xsl:variable>

<xsl:element name="h{$hlevel}">
<xsl:call-template name="id.attribute">
<xsl:with-param name="conditional" select="0"/>
</xsl:call-template>
<xsl:call-template name="anchor">
<xsl:with-param name="conditional" select="0"/>
</xsl:call-template>
<xsl:apply-templates/>
</xsl:element>
</xsl:template>

</xsl:stylesheet>