From eb85c598f8e64bb88f534f63b6d953de0c69911c Mon Sep 17 00:00:00 2001
From: Jonas Smedegaard <dr@jones.dk>
Date: Thu, 15 May 2025 09:42:46 +0200
Subject: cover braced-only enclosure

---
 .../semantic-markdown/semantic-markdown.lua        | 48 +++++++++++++++++++---
 1 file changed, 43 insertions(+), 5 deletions(-)

diff --git a/_extensions/ruc-play/semantic-markdown/semantic-markdown.lua b/_extensions/ruc-play/semantic-markdown/semantic-markdown.lua
index 505b296..bcd8f13 100644
--- a/_extensions/ruc-play/semantic-markdown/semantic-markdown.lua
+++ b/_extensions/ruc-play/semantic-markdown/semantic-markdown.lua
@@ -332,6 +332,7 @@ local function Statements (block)
       if encl == Enclosure.BRACED_DONE then
 
         -- push post-brace string to stack
+        -- and disqualify brace-only end-of-block enclosure
         -- TODO: parse chars_unenclosed as Str instead
         if chars_unenclosed:len() > 0 then
           elems_unenclosed:insert(pandoc.Str(chars_unenclosed))
@@ -383,21 +384,30 @@ local function Statements (block)
     -- unenclosed immediately after enclosure
     if encl == Enclosure.BRACED_DONE then
 
+      -- push post-brace string to stack
+      -- and disqualify brace-only end-of-block enclosure
       -- TODO: parse chars_unenclosed as Str
-
+      if chars_unenclosed:len() > 0 then
+        elems_unenclosed:insert(pandoc.Str(chars_unenclosed))
+      end
+      chars_unenclosed = ""
+      chars_enclosed = ""
+      elems:extend(elems_unenclosed)
+      elems_unenclosed = pandoc.List()
+      elems_enclosed = pandoc.List()
       encl = Enclosure.NONE
     end
 
     -- unenclosed
     -- TODO: accept backslash except immediately before bracket
     if encl == Enclosure.NONE then
-      local _, nextpos, s = el.text:find("^([^%[\\]*)")
+      local _, nextpos, s = el.text:find("^([^%[{\\]*)")
       pos = nextpos and nextpos + 1 or pos + 1
       chars_unenclosed = chars_unenclosed..s
 
-      -- entering bracketed enclosure
+      -- entering bracketed or braced enclosure
       local t = el.text:sub(pos, pos)
-      if t == "[" then
+      if t == "[" or t == "{" then
 
         -- qualify unenclosed elements
         elems:extend(elems_unenclosed)
@@ -410,7 +420,11 @@ local function Statements (block)
         pos = pos + 1
         chars_unenclosed = chars_unenclosed..t
         chars_enclosed = ""
-        encl = Enclosure.BRACKETED
+        if t == "[" then
+          encl = Enclosure.BRACKETED
+        elseif t == "{" then
+          encl = Enclosure.BRACED
+        end
       end
     end
 
@@ -477,6 +491,22 @@ local function Statements (block)
         -- qualify completed bracketed enclosure
         if not TableEmpty(elems_enclosed) then
           elems:extend(elems_enclosed)
+
+        -- qualify braced-only enclosure at beginning of block
+        elseif (TableEmpty(elems_unenclosed)
+          and (chars_unenclosed:len() == 0 or chars_unenclosed == "{"))
+        then
+          elems:extend(elems_enclosed)
+
+        -- postpone braced-only enclosure maybe at end of block
+        else
+          chars_unenclosed = chars_unenclosed..el.text:sub(pos, nextpos)
+          elems_unenclosed:insert(pandoc.Str(chars_unenclosed))
+          chars_unenclosed = el.text:sub(nextpos + 1)
+          chars_enclosed = el.text:sub(nextpos + 1)
+          encl = Enclosure.BRACED_DONE
+
+          goto continue
         end
 
         elems_enclosed = pandoc.List()
@@ -503,6 +533,14 @@ local function Statements (block)
     ::continue::
   end
 
+  -- qualify brace-only enclosure at end of block
+  if encl == Enclosure.BRACED_DONE
+    and not TableEmpty(elems_enclosed)
+  then
+    elems:extend(elems_enclosed)
+    statement_count = statement_count + 1
+  end
+
   -- return altered stack if it contains complete enclosures
   if statement_count > 0 then
 
-- 
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