PICO-8 debug serializer

debug.lua

--[[
Debug function for Pico-8
- Serializes nested tables
- Colors output according to variable's type
- Lists table values in alphanumeric key order
]]

function debug(val,x,y)
  local oc=peek(0x5f25)--store original drawing color
  local serialized=debug_serialize(val)
  if x and y then
    print(serialized,x,y) --use position when given
  else print(serialized) end
  color(oc)--restore color
end

--should convert anything to a string
function debug_serialize(val,round,level)
  level=level or 0
  local vtype=type(val)
  return debug_config.formatters[vtype](val,level);
end

--colorization function
_C=function(fg,bg)
  local fgc=fg and debug_config.colors[fg] or false
  local bgc=bg and debug_config.colors[bg] or false
  return (fgc and ("\f"..fgc) or "")..(bgc and ("\b"..bgc) or "")
end

debug_config={
  colors={
    [""]=5,--default color
    string="e",
    number="c",
    bool_f=8,
    bool_t="b",
    key="d",
    other=8,
    paren=5
  },
  formatters={
    ["nil"]=function() return _C"other".."[nil]" end,
    ["function"]=function() return _C"other".."[func]" end,
    ["string"]=function(str) return _C"string".."\""..str.."\"" end,
    ["number"]=function(num) return _C"number"..num end,
    ["boolean"]=function(bool) return _C(bool and "bool_t" or "bool_f")..(bool and "true" or "false") end,
    ["table"]=function(tbl,d)
      --sort keys alphabetically
      local keys={}
      for k in pairs(tbl) do add(keys,k) end
      sort(keys)
      d+=1--increase indentation depth
      local s=_C"paren".."{\n"
      for k in all(keys) do
        local v=tbl[k]
        s=s.."\*"..d.." "--apply indentation
        s=s.._C"key"..(
          --show key names unless it's an array
          type(k)=="string" and k.._C"".."=" or ""
        )
        --use recursion for printing the value
        s=s..debug_serialize(v,round,d).._C""..",\n"
      end
      s=sub(s,0,#s-2).."\n"
      d-=1--decrease indentation
      if(d>0) s=s.."\*"..d.." "
      s=s.._C"paren".."}"
      return s
    end
  }
}

--[[
would be nice to just require these, but alas,
pico-8 seems to support neither #include
or require() for .lua files...
]]
function sort(arr, comp)
 comp = comp or _sort_numbers
 local function partition (a, lo, hi)
   pivot = a[hi]
   i = lo - 1
   for j = lo, hi - 1 do
   if comp(a[j], pivot) then
   i = i + 1
   a[i], a[j] = a[j], a[i]
   end
   end
   a[i + 1], a[hi] = a[hi], a[i + 1]
   return i + 1
  end
 local function quicksort (a, lo, hi)
  if lo < hi then
   p = partition(a, lo, hi)
   quicksort(a, lo, p - 1)
   return quicksort(a, p + 1, hi)
  end
 end
 return quicksort(arr, 1, #arr)
end
function _sort_numbers(a, b)
  return a < b
end