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doc: Add index letter links to XSLT HTML build
This matches what was already implemented in the DSSSL HTML build.
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‎doc/src/sgml/stylesheet.xsl

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<?xml version='1.0'?>
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<!DOCTYPE xsl:stylesheet [
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<!ENTITY % common.entities SYSTEM "http://docbook.sourceforge.net/release/xsl/current/common/entities.ent">
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%common.entities;
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]>
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<xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
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version='1.0'
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xmlns="http://www.w3.org/TR/xhtml1/transitional"
@@ -59,4 +63,187 @@ section toc
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set toc,title
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</xsl:param>
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<!-- Put index "quicklinks" (A | B | C | ...) at the top of the bookindex page. -->
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<!-- from html/autoidx.xsl -->
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<xsl:template name="generate-basic-index">
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<xsl:param name="scope" select="NOTANODE"/>
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<xsl:variable name="role">
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<xsl:if test="$index.on.role != 0">
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<xsl:value-of select="@role"/>
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</xsl:if>
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</xsl:variable>
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<xsl:variable name="type">
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<xsl:if test="$index.on.type != 0">
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<xsl:value-of select="@type"/>
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</xsl:if>
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</xsl:variable>
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<xsl:variable name="terms"
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select="//indexterm
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[count(.|key('letter',
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translate(substring(&primary;, 1, 1),
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&lowercase;,
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&uppercase;))
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[&scope;][1]) = 1
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and not(@class = 'endofrange')]"/>
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<xsl:variable name="alphabetical"
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select="$terms[contains(concat(&lowercase;, &uppercase;),
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substring(&primary;, 1, 1))]"/>
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<xsl:variable name="others" select="$terms[not(contains(concat(&lowercase;,
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&uppercase;),
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substring(&primary;, 1, 1)))]"/>
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<div class="index">
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<!-- pgsql-docs: begin added stuff -->
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<p class="indexdiv-quicklinks">
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<a href="#indexdiv-Symbols">
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<xsl:call-template name="gentext">
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<xsl:with-param name="key" select="'index symbols'"/>
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</xsl:call-template>
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</a>
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<xsl:apply-templates select="$alphabetical[count(.|key('letter',
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translate(substring(&primary;, 1, 1),
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&lowercase;,&uppercase;))[&scope;][1]) = 1]"
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mode="index-div-quicklinks">
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<xsl:with-param name="position" select="position()"/>
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<xsl:with-param name="scope" select="$scope"/>
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<xsl:with-param name="role" select="$role"/>
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<xsl:with-param name="type" select="$type"/>
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<xsl:sort select="translate(&primary;, &lowercase;, &uppercase;)"/>
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</xsl:apply-templates>
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</p>
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<!-- pgsql-docs: end added stuff -->
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<xsl:if test="$others">
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<xsl:choose>
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<xsl:when test="normalize-space($type) != '' and
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$others[@type = $type][count(.|key('primary', &primary;)[&scope;][1]) = 1]">
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<!-- pgsql-docs: added id attribute here for linking to it -->
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<div class="indexdiv" id="indexdiv-Symbols">
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<h3>
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<xsl:call-template name="gentext">
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<xsl:with-param name="key" select="'index symbols'"/>
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</xsl:call-template>
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</h3>
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<dl>
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<xsl:apply-templates select="$others[count(.|key('primary', &primary;)[&scope;][1]) = 1]"
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mode="index-symbol-div">
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<xsl:with-param name="position" select="position()"/>
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<xsl:with-param name="scope" select="$scope"/>
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<xsl:with-param name="role" select="$role"/>
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<xsl:with-param name="type" select="$type"/>
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<xsl:sort select="translate(&primary;, &lowercase;, &uppercase;)"/>
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</xsl:apply-templates>
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</dl>
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</div>
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</xsl:when>
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<xsl:when test="normalize-space($type) != ''">
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<!-- Output nothing, as there isn't a match for $other using this $type -->
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</xsl:when>
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<xsl:otherwise>
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<!-- pgsql-docs: added id attribute here for linking to it -->
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<div class="indexdiv" id="indexdiv-Symbols">
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<h3>
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<xsl:call-template name="gentext">
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<xsl:with-param name="key" select="'index symbols'"/>
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</xsl:call-template>
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</h3>
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<dl>
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<xsl:apply-templates select="$others[count(.|key('primary',
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&primary;)[&scope;][1]) = 1]"
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mode="index-symbol-div">
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<xsl:with-param name="position" select="position()"/>
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<xsl:with-param name="scope" select="$scope"/>
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<xsl:with-param name="role" select="$role"/>
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<xsl:with-param name="type" select="$type"/>
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<xsl:sort select="translate(&primary;, &lowercase;, &uppercase;)"/>
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</xsl:apply-templates>
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</dl>
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</div>
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</xsl:otherwise>
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</xsl:choose>
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</xsl:if>
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<xsl:apply-templates select="$alphabetical[count(.|key('letter',
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translate(substring(&primary;, 1, 1),
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&lowercase;,&uppercase;))[&scope;][1]) = 1]"
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mode="index-div-basic">
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<xsl:with-param name="position" select="position()"/>
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<xsl:with-param name="scope" select="$scope"/>
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<xsl:with-param name="role" select="$role"/>
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<xsl:with-param name="type" select="$type"/>
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<xsl:sort select="translate(&primary;, &lowercase;, &uppercase;)"/>
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</xsl:apply-templates>
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</div>
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</xsl:template>
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<xsl:template match="indexterm" mode="index-div-basic">
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<xsl:param name="scope" select="."/>
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<xsl:param name="role" select="''"/>
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<xsl:param name="type" select="''"/>
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<xsl:variable name="key"
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select="translate(substring(&primary;, 1, 1),
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&lowercase;,&uppercase;)"/>
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<xsl:if test="key('letter', $key)[&scope;]
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[count(.|key('primary', &primary;)[&scope;][1]) = 1]">
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<div class="indexdiv">
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<!-- pgsql-docs: added id attribute here for linking to it -->
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<xsl:attribute name="id">
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<xsl:value-of select="concat('indexdiv-', $key)"/>
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</xsl:attribute>
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<xsl:if test="contains(concat(&lowercase;, &uppercase;), $key)">
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<h3>
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<xsl:value-of select="translate($key, &lowercase;, &uppercase;)"/>
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</h3>
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</xsl:if>
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<dl>
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<xsl:apply-templates select="key('letter', $key)[&scope;]
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[count(.|key('primary', &primary;)
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[&scope;][1])=1]"
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mode="index-primary">
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<xsl:with-param name="position" select="position()"/>
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<xsl:with-param name="scope" select="$scope"/>
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<xsl:with-param name="role" select="$role"/>
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<xsl:with-param name="type" select="$type"/>
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<xsl:sort select="translate(&primary;, &lowercase;, &uppercase;)"/>
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</xsl:apply-templates>
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</dl>
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</div>
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</xsl:if>
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</xsl:template>
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<!-- pgsql-docs -->
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<xsl:template match="indexterm" mode="index-div-quicklinks">
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<xsl:param name="scope" select="."/>
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<xsl:param name="role" select="''"/>
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<xsl:param name="type" select="''"/>
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<xsl:variable name="key"
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select="translate(substring(&primary;, 1, 1),
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&lowercase;,&uppercase;)"/>
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<xsl:if test="key('letter', $key)[&scope;]
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[count(.|key('primary', &primary;)[&scope;][1]) = 1]">
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<xsl:if test="contains(concat(&lowercase;, &uppercase;), $key)">
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|
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<a>
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<xsl:attribute name="href">
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<xsl:value-of select="concat('#indexdiv-', $key)"/>
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</xsl:attribute>
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<xsl:value-of select="translate($key, &lowercase;, &uppercase;)"/>
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</a>
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</xsl:if>
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</xsl:if>
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</xsl:template>
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</xsl:stylesheet>

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