1 files changed, 57 insertions, 6 deletions
diff --git a/tex/context/base/mkiv/buff-ver.lua b/tex/context/base/mkiv/buff-ver.lua
index bfc9ef89c..969a28055 100644
--- a/tex/context/base/mkiv/buff-ver.lua
+++ b/tex/context/base/mkiv/buff-ver.lua
@@ -142,7 +142,8 @@ local functions = { __index = {
 local handlers = { }
 
 function visualizers.newhandler(name,data)
-    local tname, tdata = type(name), type(data)
+    local tname = type(name)
+    local tdata = type(data)
     if tname == "table" then -- (data)
         setmetatable(name,getmetatable(name) or functions)
         return name
@@ -615,7 +616,12 @@ end
 local onlyspaces = S(" \t\f\n\r")^0 * P(-1)
 
 local function getstrip(lines,first,last)
-    local first, last = first or 1, last or #lines
+    if not first then
+        first = 1
+    end
+    if not last then
+        last = #lines
+    end
     for i=first,last do
         local li = lines[i]
         if #li == 0 or lpegmatch(onlyspaces,li) then
@@ -741,9 +747,10 @@ local function filter(lines,settings) -- todo: inline or display in settings
     if strip ~= v_no and strip ~= false then
         lines = realign(lines,strip)
     end
-    local line, n = 0, 0
-    local first, last, m = getstrip(lines)
+    local line  = 0
+    local n     = 0
     local range = settings.range
+    local first, last, m = getstrip(lines)
     if range then
         first, last = getrange(lines,first,last,range)
         first, last = getstrip(lines,first,last)
@@ -810,7 +817,7 @@ local function typestring(settings)
         local compact   = settings.compact
         local compactor = compact and compactors[compact]
         if compactor then
-            content = lpegmatch(compactor,content)
+            content = lpegmatch(compactor,content) or content
         end
      -- content = decodecomment(content)
      -- content = dotabs(content,settings)
@@ -846,7 +853,7 @@ implement {
     actions   = typestring,
     arguments = {
         {
-            { "data"    },
+            { "data" },
             { "tab"     },
             { "method"  },
             { "compact" },
@@ -856,6 +863,50 @@ implement {
     }
 }
 
+-- implement {
+--     name      = "type_x",
+--     actions   = typestring,
+--     arguments = {
+--         {
+--             { "data", "verbatim" },
+--             { "tab"     },
+--             { "method"  },
+--             { "compact" },
+--             { "nature"  },
+--             { "escape"  },
+--         }
+--     }
+-- }
+
+-- local function typestring_y(settings)
+--     local content = tex.toks[settings.n]
+--     if content and content ~= "" then
+--         local compact   = settings.compact
+--         local compactor = compact and compactors[compact]
+--         if compactor then
+--             content = lpegmatch(compactor,content)
+--         end
+--      -- content = decodecomment(content)
+--      -- content = dotabs(content,settings)
+--         visualize(content,checkedsettings(settings,"inline"))
+--     end
+-- end
+
+-- implement {
+--     name      = "type_y",
+--     actions   = typestring_y,
+--     arguments = {
+--         {
+--             { "n", "integer" },
+--             { "tab"     },
+--             { "method"  },
+--             { "compact" },
+--             { "nature"  },
+--             { "escape"  },
+--         }
+--     }
+-- }
+
 implement {
     name      = "processbuffer",
     actions   = processbuffer,