resolves asciidoctor#3652 honor secondary and tertiary terms on index…

…term macro when primary term is quoted and contains =

CHANGELOG.adoc

@@ -70,6 +70,7 @@ Bug Fixes::
 
   * Preserve paragraph breaks in normal table cell in manpage output (#4481)
   * Escape spaces in include target (using inline passthrough) when generating link from include directive (#4461)
+  * Honor secondary and tertiary terms on `indexterm` macro when primary term is quoted and contains an equals sign (#3652)
 
 == 2.0.20 (2023-05-18) - @mojavelinux
 

lib/asciidoctor/substitutors.rb

@@ -446,7 +446,14 @@ def sub_macros text
           # indexterm:[Tigers,Big cats]
           if (attrlist = normalize_text $2, true, true).include? '='
             if (primary = (attrs = (AttributeList.new attrlist, self).parse)[1])
-              attrs['terms'] = [primary]
+              terms = [primary]
+              if (secondary = attrs[2])
+                terms << secondary
+                if (tertiary = attrs[3])
+                  terms << tertiary
+                end
+              end
+              attrs['terms'] = terms
               if (see_also = attrs['see-also'])
                 attrs['see-also'] = (see_also.include? ',') ? (see_also.split ',').map {|it| it.lstrip } : [see_also]
               end

test/substitutions_test.rb

@@ -1632,6 +1632,17 @@
       assert_includes output, indexterm_html5
     end
 
+    test 'should honor secondary and tertiary index terms when primary index term is quoted and contains equals sign' do
+      sentence = 'Assigning variables.'
+      expected = %(#{sentence}<indexterm><primary>name=value</primary><secondary>variable</secondary><tertiary>assignment</tertiary></indexterm>)
+      macros = ['indexterm:["name=value",variable,assignment]', '(((name=value,variable,assignment)))']
+      macros.each do |macro|
+        para = block_from_string %(#{sentence}#{macro}), backend: 'docbook'
+        output = (para.sub_macros para.source).tr ?\n, ''
+        assert_equal expected, output
+      end
+    end
+
     context 'Button macro' do
       test 'btn macro' do
         para = block_from_string 'btn:[Save]', attributes: { 'experimental' => '' }