From f5c630a409a264f67efb7d170e0409948a470e21 Mon Sep 17 00:00:00 2001
From: Bob Stayton <bobs@sagehill.net>
Date: Sun, 18 Apr 2004 19:37:23 +0000
Subject: [PATCH] Add support for generating an index containing only those
 terms with a matching role attribute.

---
 xsl/html/autoidx.xsl | 37 ++++++++++++++++++++++++++++++++++++-
 1 file changed, 36 insertions(+), 1 deletion(-)

diff --git a/xsl/html/autoidx.xsl b/xsl/html/autoidx.xsl
index 0b0f16e87..2f386f717 100644
--- a/xsl/html/autoidx.xsl
+++ b/xsl/html/autoidx.xsl
@@ -35,7 +35,8 @@
 
 <!ENTITY section.id 'generate-id(&section;)'>
 <!ENTITY sep '" "'>
-<!ENTITY scope 'count(ancestor::node()|$scope) = count(ancestor::node())'>
+<!ENTITY scope 'count(ancestor::node()|$scope) = count(ancestor::node())
+                and ($role = @role or string-length($role) = 0)'>
 ]>
 <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform"
                 version="1.0">
@@ -100,6 +101,12 @@
 <xsl:template name="generate-index">
   <xsl:param name="scope" select="(ancestor::book|/)[last()]"/>
 
+  <xsl:variable name="role">
+    <xsl:if test="$index.on.role != 0">
+      <xsl:value-of select="@role"/>
+    </xsl:if>
+  </xsl:variable>
+
   <xsl:variable name="terms"
                 select="//indexterm[count(.|key('letter',
                                                 translate(substring(&primary;, 1, 1),
@@ -127,6 +134,7 @@
                                        &primary;)[&scope;][1]) = 1]"
                                mode="index-symbol-div">
             <xsl:with-param name="scope" select="$scope"/>
+            <xsl:with-param name="role" select="$role"/>
             <xsl:sort select="translate(&primary;, &lowercase;, &uppercase;)"/>
           </xsl:apply-templates>
         </dl>
@@ -138,6 +146,7 @@
                                            &lowercase;,&uppercase;))[&scope;][1]) = 1]"
                          mode="index-div">
       <xsl:with-param name="scope" select="$scope"/>
+      <xsl:with-param name="role" select="$role"/>
       <xsl:sort select="translate(&primary;, &lowercase;, &uppercase;)"/>
     </xsl:apply-templates>
   </div>
@@ -145,6 +154,7 @@
 
 <xsl:template match="indexterm" mode="index-div">
   <xsl:param name="scope" select="."/>
+  <xsl:param name="role" select="''"/>
 
   <xsl:variable name="key"
                 select="translate(substring(&primary;, 1, 1),&lowercase;,&uppercase;)"/>
@@ -163,6 +173,7 @@
                                      [count(.|key('primary', &primary;)[&scope;][1])=1]"
                              mode="index-primary">
           <xsl:with-param name="scope" select="$scope"/>
+          <xsl:with-param name="role" select="$role"/>
           <xsl:sort select="translate(&primary;, &lowercase;, &uppercase;)"/>
         </xsl:apply-templates>
       </dl>
@@ -172,6 +183,7 @@
 
 <xsl:template match="indexterm" mode="index-symbol-div">
   <xsl:param name="scope" select="/"/>
+  <xsl:param name="role" select="''"/>
 
   <xsl:variable name="key" select="translate(substring(&primary;, 1, 1),
                                              &lowercase;,&uppercase;)"/>
@@ -180,12 +192,14 @@
                                [count(.|key('primary', &primary;)[&scope;][1]) = 1]"
                        mode="index-primary">
     <xsl:with-param name="scope" select="$scope"/>
+    <xsl:with-param name="role" select="$role"/>
     <xsl:sort select="translate(&primary;, &lowercase;, &uppercase;)"/>
   </xsl:apply-templates>
 </xsl:template>
 
 <xsl:template match="indexterm" mode="index-primary">
   <xsl:param name="scope" select="."/>
+  <xsl:param name="role" select="''"/>
 
   <xsl:variable name="key" select="&primary;"/>
   <xsl:variable name="refs" select="key('primary', $key)[&scope;]"/>
@@ -194,6 +208,7 @@
     <xsl:for-each select="$refs[generate-id() = generate-id(key('primary-section', concat($key, &sep;, &section.id;))[&scope;][1])]">
       <xsl:apply-templates select="." mode="reference">
         <xsl:with-param name="scope" select="$scope"/>
+        <xsl:with-param name="role" select="$role"/>
       </xsl:apply-templates>
     </xsl:for-each>
 
@@ -201,6 +216,7 @@
       <xsl:apply-templates select="$refs[generate-id() = generate-id(key('see', concat(&primary;, &sep;, &sep;, &sep;, see))[&scope;][1])]"
                            mode="index-see">
         <xsl:with-param name="scope" select="$scope"/>
+        <xsl:with-param name="role" select="$role"/>
         <xsl:sort select="translate(see, &lowercase;, &uppercase;)"/>
       </xsl:apply-templates>
     </xsl:if>
@@ -211,11 +227,13 @@
         <xsl:apply-templates select="$refs[generate-id() = generate-id(key('see-also', concat(&primary;, &sep;, &sep;, &sep;, seealso))[&scope;][1])]"
                              mode="index-seealso">
           <xsl:with-param name="scope" select="$scope"/>
+          <xsl:with-param name="role" select="$role"/>
           <xsl:sort select="translate(seealso, &lowercase;, &uppercase;)"/>
         </xsl:apply-templates>
         <xsl:apply-templates select="$refs[secondary and count(.|key('secondary', concat($key, &sep;, &secondary;))[&scope;][1]) = 1]" 
                              mode="index-secondary">
           <xsl:with-param name="scope" select="$scope"/>
+          <xsl:with-param name="role" select="$role"/>
           <xsl:sort select="translate(&secondary;, &lowercase;, &uppercase;)"/>
         </xsl:apply-templates>
       </dl>
@@ -225,6 +243,7 @@
 
 <xsl:template match="indexterm" mode="index-secondary">
   <xsl:param name="scope" select="."/>
+  <xsl:param name="role" select="''"/>
 
   <xsl:variable name="key" select="concat(&primary;, &sep;, &secondary;)"/>
   <xsl:variable name="refs" select="key('secondary', $key)[&scope;]"/>
@@ -233,6 +252,7 @@
     <xsl:for-each select="$refs[generate-id() = generate-id(key('secondary-section', concat($key, &sep;, &section.id;))[&scope;][1])]">
       <xsl:apply-templates select="." mode="reference">
         <xsl:with-param name="scope" select="$scope"/>
+        <xsl:with-param name="role" select="$role"/>
       </xsl:apply-templates>
     </xsl:for-each>
 
@@ -240,6 +260,7 @@
       <xsl:apply-templates select="$refs[generate-id() = generate-id(key('see', concat(&primary;, &sep;, &secondary;, &sep;, &sep;, see))[&scope;][1])]"
                            mode="index-see">
         <xsl:with-param name="scope" select="$scope"/>
+        <xsl:with-param name="role" select="$role"/>
         <xsl:sort select="translate(see, &lowercase;, &uppercase;)"/>
       </xsl:apply-templates>
     </xsl:if>
@@ -250,11 +271,13 @@
         <xsl:apply-templates select="$refs[generate-id() = generate-id(key('see-also', concat(&primary;, &sep;, &secondary;, &sep;, &sep;, seealso))[&scope;][1])]"
                              mode="index-seealso">
           <xsl:with-param name="scope" select="$scope"/>
+          <xsl:with-param name="role" select="$role"/>
           <xsl:sort select="translate(seealso, &lowercase;, &uppercase;)"/>
         </xsl:apply-templates>
         <xsl:apply-templates select="$refs[tertiary and count(.|key('tertiary', concat($key, &sep;, &tertiary;))[&scope;][1]) = 1]" 
                              mode="index-tertiary">
           <xsl:with-param name="scope" select="$scope"/>
+          <xsl:with-param name="role" select="$role"/>
           <xsl:sort select="translate(&tertiary;, &lowercase;, &uppercase;)"/>
         </xsl:apply-templates>
       </dl>
@@ -264,6 +287,7 @@
 
 <xsl:template match="indexterm" mode="index-tertiary">
   <xsl:param name="scope" select="."/>
+  <xsl:param name="role" select="''"/>
 
   <xsl:variable name="key" select="concat(&primary;, &sep;, &secondary;, &sep;, &tertiary;)"/>
   <xsl:variable name="refs" select="key('tertiary', $key)[&scope;]"/>
@@ -272,6 +296,7 @@
     <xsl:for-each select="$refs[generate-id() = generate-id(key('tertiary-section', concat($key, &sep;, &section.id;))[&scope;][1])]">
       <xsl:apply-templates select="." mode="reference">
         <xsl:with-param name="scope" select="$scope"/>
+        <xsl:with-param name="role" select="$role"/>
       </xsl:apply-templates>
     </xsl:for-each>
 
@@ -279,6 +304,7 @@
       <xsl:apply-templates select="$refs[generate-id() = generate-id(key('see', concat(&primary;, &sep;, &secondary;, &sep;, &tertiary;, &sep;, see))[&scope;][1])]"
                            mode="index-see">
         <xsl:with-param name="scope" select="$scope"/>
+        <xsl:with-param name="role" select="$role"/>
         <xsl:sort select="translate(see, &lowercase;, &uppercase;)"/>
       </xsl:apply-templates>
     </xsl:if>
@@ -289,11 +315,13 @@
         <xsl:apply-templates select="$refs[generate-id() = generate-id(key('see', concat(&primary;, &sep;, &secondary;, &sep;, &tertiary;, &sep;, see))[&scope;][1])]"
                              mode="index-see">
           <xsl:with-param name="scope" select="$scope"/>
+          <xsl:with-param name="role" select="$role"/>
           <xsl:sort select="translate(see, &lowercase;, &uppercase;)"/>
         </xsl:apply-templates>
         <xsl:apply-templates select="$refs[generate-id() = generate-id(key('see-also', concat(&primary;, &sep;, &secondary;, &sep;, &tertiary;, &sep;, seealso))[&scope;][1])]"
                              mode="index-seealso">
           <xsl:with-param name="scope" select="$scope"/>
+          <xsl:with-param name="role" select="$role"/>
 	  <xsl:sort select="translate(seealso, &lowercase;, &uppercase;)"/>
         </xsl:apply-templates>
       </dl>
@@ -303,6 +331,7 @@
 
 <xsl:template match="indexterm" mode="reference">
   <xsl:param name="scope" select="."/>
+  <xsl:param name="role" select="''"/>
   <xsl:param name="separator" select="', '"/>
 
   <xsl:value-of select="$separator"/>
@@ -311,6 +340,7 @@
       <xsl:call-template name="reference">
         <xsl:with-param name="zones" select="normalize-space(@zone)"/>
           <xsl:with-param name="scope" select="$scope"/>
+          <xsl:with-param name="role" select="$role"/>
       </xsl:call-template>
     </xsl:when>
     <xsl:otherwise>
@@ -332,6 +362,7 @@
         <xsl:apply-templates select="key('endofrange', @id)[&scope;][last()]"
                              mode="reference">
           <xsl:with-param name="scope" select="$scope"/>
+          <xsl:with-param name="role" select="$role"/>
           <xsl:with-param name="separator" select="'-'"/>
         </xsl:apply-templates>
       </xsl:if>
@@ -341,6 +372,7 @@
 
 <xsl:template name="reference">
   <xsl:param name="scope" select="."/>
+  <xsl:param name="role" select="''"/>
   <xsl:param name="zones"/>
 
   <xsl:choose>
@@ -360,6 +392,7 @@
       <xsl:call-template name="reference">
         <xsl:with-param name="zones" select="substring-after($zones, ' ')"/>
         <xsl:with-param name="scope" select="$scope"/>
+        <xsl:with-param name="role" select="$role"/>
       </xsl:call-template>
     </xsl:when>
     <xsl:otherwise>
@@ -380,6 +413,7 @@
 
 <xsl:template match="indexterm" mode="index-see">
   <xsl:param name="scope" select="."/>
+  <xsl:param name="role" select="''"/>
 
   <xsl:text> (</xsl:text>
   <xsl:call-template name="gentext">
@@ -392,6 +426,7 @@
 
 <xsl:template match="indexterm" mode="index-seealso">
   <xsl:param name="scope" select="."/>
+  <xsl:param name="role" select="''"/>
 
   <dt>
   <xsl:text>(</xsl:text>
-- 
2.40.0