--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/test/callback_suite_aggrs/mk-cases.lua	Wed Apr 13 14:59:57 2022 +0200
@@ -0,0 +1,138 @@
+require "config"
+
+-- use shared helpers to generate cases
+package.path = '../common/?.lua;' .. package.path
+require"mk-cases"
+
+
+-- returns: generated case str, num args; accumulates unique idx => aggr-sig in
+-- aggrs (sequentially) and aggr-sig => {body,name} in seen_aggrs (depth first
+-- for nested aggrs, so sub-aggrs conveniently precede parents)
+function mkcase(id, sig, aggrs, seen_aggrs)
+  local sig = trim(sig)
+  local fsig = put_sig_rtype_first(sig)
+  local h = { "/* ",id,":",sig," */ " }
+  local t = { }
+  local pos = -1
+  local n_nest = 0
+  local aggr = { }
+  local aggr_sig = { }
+  aggr[0] = { }     -- non-sequential [0] collects all non-aggr types (not used, though)
+  aggr_sig[0] = ''
+  for i = 1, #fsig do
+    local name = "a"..pos
+    local ch   = fsig:sub(i,i)
+
+-- @@@ not handling callconv prefixes
+
+    -- aggregate nest level change?
+    if ch == '{' or ch == '<' then
+      n_nest = n_nest + 1
+      aggr[n_nest] = { }
+      aggr_sig[n_nest] = ''
+    end
+
+    aggr_sig[n_nest] = aggr_sig[n_nest]..ch
+
+    -- array? Just append to name of member var from prev loop
+    if ch:match('[%[%]0123456789]') ~= nil then
+      aggr[n_nest][#aggr[n_nest]] = aggr[n_nest][#aggr[n_nest]]..ch
+    else
+      -- register (sub)aggrs on closing char
+      if ch == '}' or ch == '>' then
+        -- only add unseen aggregates, key is aggr sig, val is body and name
+        if seen_aggrs[aggr_sig[n_nest]] == nil then
+          aggrs[#aggrs+1] = aggr_sig[n_nest]
+          if ch == '}' then ch = 'struct ' else ch = 'union ' end
+		  ch = ch..'A'..#aggrs
+          seen_aggrs[aggr_sig[n_nest]] = { aggr[n_nest], ch }
+        end
+        ch = seen_aggrs[aggr_sig[n_nest]][2]
+
+        n_nest = n_nest - 1
+        aggr_sig[n_nest] = aggr_sig[n_nest]..aggr_sig[n_nest+1]
+      end
+
+      -- add member type and var name to aggr
+      if ch ~= '{' and ch ~= '}' and ch ~= '<' and ch ~= '>' then
+        aggr[n_nest][#aggr[n_nest]+1] = ch
+        aggr[n_nest][#aggr[n_nest]+1] = 'm'..(#aggr[n_nest] >> 1)
+      end
+
+      -- no nesting (= actual func args), generate case code
+      if n_nest == 0 then
+        -- aggregate types have more than one char
+        if #ch > 1 then
+          t[#t+1] = "*("..ch.."*)K_a["..pos.."]"
+        else
+          --t[#t+1] = "V_"..ch.."["..pos.."]="..name..";"
+          t[#t+1] = "K_"..ch.."["..pos.."]"
+        end
+
+        -- is return type or func arg?
+        if pos == -1 then
+          h[#h+1] = "void f"..id.."(void* addr) { write_V_" -- @@@ not handling callconv prefixes
+          h[#h+1] = ch -- pos = 7
+          h[#h+1] = '('
+          h[#h+1] = -1 -- pos = 9; retval pos (=num args), will be set at end
+          h[#h+1] = ', (( '..ch..'(*)('
+          t = { }  -- clear; aggr return type handled explicitly
+        else
+          h[#h+1] = ch
+          h[#h+1] = ","
+        end
+
+        pos = pos + 1
+      end
+    end
+  end
+  e = ')'
+  -- retval is aggregate?
+  if #h[7] > 1 then
+    e = '), '..h[7]
+    h[7] = 'a'
+  end
+  h[9] = pos
+  if h[#h] == ',' then h[#h] = '' end
+  h[#h + 1] = "))addr)("
+  return table.concat(h,"")..table.concat(t,",")..e..");}\n", pos
+end
+
+
+function mkall()
+  local lineno = 0
+  local sigtab = { }
+  local cases = ''
+  local aggrs = { }
+  local seen_aggrs = { }
+  local max_numargs = 0
+
+  for line in io.lines() do
+    local sig = trim(line)
+	local c, n = mkcase(lineno, sig, aggrs, seen_aggrs)
+    cases = cases..c
+    max_numargs = math.max(max_numargs, n)
+    sigtab[#sigtab+1] = sig
+    lineno = lineno + 1
+  end
+
+  local agg_defs, agg_sizes, agg_sigs, agg_names = mkaggrdefs(aggrs, seen_aggrs, aggrpacking, aggrpackingseed, aggrcpsimple)
+
+  -- make table.concat work
+  if #agg_names > 0 then
+    table.insert(agg_names, 1, '')
+  end
+
+  io.write(table.concat(agg_defs,'\n')..'\n')
+  io.write(cases)
+  io.write(mkfuntab(lineno, 'f', 'funptr', 'G_funtab', true))
+  io.write(mksigtab(sigtab, '', 'G_sigtab'))
+  io.write('const char* G_agg_sigs[]  = {\n\t"'..table.concat(agg_sigs, '",\n\t"')..'"\n};\n')
+  io.write('int G_agg_sizes[] = {\n\t'..table.concat(agg_sizes, ',\n\t')..'\n};\n')
+  io.write('funptr G_agg_touchAfuncs[] = {'..string.sub(table.concat(agg_names, ',\n\t(funptr)&f_touch'),2)..'\n};\n')
+  io.write('funptr G_agg_cmpfuncs[] = {'..string.sub(table.concat(agg_names, ',\n\t(funptr)&f_cmp'),2)..'\n};\n')
+  io.write("int G_maxargs = "..max_numargs..";\n")
+end
+
+mkall()
+