resolves #4268 implicitly attach nested list that starts with block attribute lines to dlist entry (PR #4439)

1 files changed, 19 insertions, 4 deletions

diff --git a/lib/asciidoctor/parser.rb b/lib/asciidoctor/parser.rb
index fe78b229..bb7f29fe 100644
--- a/lib/asciidoctor/parser.rb
+++ b/lib/asciidoctor/parser.rb
@@ -1443,11 +1443,26 @@ class Parser
         # we're being more strict here about the terminator, but I think that's a good thing
         buffer.concat reader.read_lines_until terminator: match.terminator, read_last_line: true, context: nil
         continuation = :inactive
-      # technically BlockAttributeLineRx only breaks if ensuing line is not a list item
-      # which really means BlockAttributeLineRx only breaks if it's acting as a block delimiter
-      # FIXME to be AsciiDoc compliant, we shouldn't break if style in attribute line is "literal" (i.e., [literal])
+      # BlockAttributeLineRx only breaks dlist if ensuing line is not a list item
       elsif dlist && continuation != :active && (BlockAttributeLineRx.match? this_line)
-        break
+        block_attribute_lines = [this_line]
+        while (next_line = reader.peek_line)
+          if is_delimited_block? next_line
+            interrupt = true
+          elsif next_line.empty? || ((next_line.start_with? '[') && (BlockAttributeLineRx.match? next_line))
+            block_attribute_lines << reader.read_line
+            next
+          elsif (AnyListRx.match? next_line) && !(is_sibling_list_item? next_line, list_type, sibling_trait)
+            buffer.concat block_attribute_lines
+          else # rubocop:disable Lint/DuplicateBranch
+            interrupt = true
+          end
+          break
+        end
+        if interrupt
+          reader.unshift_lines block_attribute_lines
+          break
+        end
       elsif continuation == :active && !this_line.empty?
         # literal paragraphs have special considerations (and this is one of
         # two entry points into one)