[libxml2] Improve cross-references in API docs

[Nick Wellnhofer <nwellnhof src gnome org>]

commit 88637d428d768aa8ae530fe7de7023a00fc2b6e0
Author: Nick Wellnhofer <wellnhofer aevum de>
Date:   Wed Aug 24 15:09:46 2022 +0200

    Improve cross-references in API docs
    
    Also cross-reference keywords followed by a period. This is still a hack
    but catches quite a few more keywords.

 doc/devhelp/html.xsl | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
---
diff --git a/doc/devhelp/html.xsl b/doc/devhelp/html.xsl
index b658f678..3fce938c 100644
--- a/doc/devhelp/html.xsl
+++ b/doc/devhelp/html.xsl
@@ -14,6 +14,20 @@
       <xsl:when test="$ref">
         <a href="libxml2-{$ref/@file}.html#{$ref/@name}"><xsl:value-of select="$token"/></a>
       </xsl:when>
+      <!-- TODO: This hack only works for tokens followed by a period. -->
+      <xsl:when test="substring($token, string-length($token)) = '.'">
+        <xsl:variable name="token2" select="substring($token, 1, string-length($token) - 1)"/>
+        <xsl:variable name="ref2" select="key('symbols', $token2)"/>
+        <xsl:choose>
+          <xsl:when test="$ref2">
+            <a href="libxml2-{$ref2/@file}.html#{$ref2/@name}"><xsl:value-of select="$token2"/></a>
+            <xsl:text>.</xsl:text>
+          </xsl:when>
+          <xsl:otherwise>
+            <xsl:value-of select="$token"/>
+          </xsl:otherwise>
+        </xsl:choose>
+      </xsl:when>
       <xsl:otherwise>
         <xsl:value-of select="$token"/>
       </xsl:otherwise>