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table-track.lua
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table-track.lua
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-- Helpers.
local sgsub = string.gsub
local sformat = string.format
local smatch = string.match
local setmeta = setmetatable
local tins = nil -- forward declaration
do
local orig_tins = table.insert
tins =
function (...)
orig_tins(...)
return (...)
end
end
local printf =
function (...)
return io.output():write(sformat(...))
end
local squote =
function (s)
return [[']] .. sgsub(s, [[']], [[\']]) .. [[']]
end
local map =
function (t, f, ...)
local ret = {}
for k, v in pairs(t) do
ret[k] = f(v, ...)
end
return ret
end
local tos =
function (o)
-- typename, representation
local t = type(o)
o = tostring(o)
if t == 'string' then
o = sgsub(o, '[\r\n\t]', { ['\r'] = [[\r]], ['\n'] = [[\n]], ['\t'] = [[\t]] })
o = sgsub(o, '%c', function (c) return string.format('<0x%02X>', string.byte(c)) end)
o = squote(o)
elseif
-- in order of commonality
t == 'table' or
t == 'function' or
t == 'userdata' or
t == 'thread'
then
-- subtype, value
local s, v = smatch(o, '^([^: ]*).-(0x%x*)')
if s == 'file' then
t = t .. ':' .. s
end
-- o = '-> ' .. v
o = v .. ':' .. t
end
-- return sformat('(%s) %s', t, o)
return o
end
local tracked = setmetatable({}, { __mode = 'k' })
local name_info = setmetatable({}, { __mode = 'k' })
-- create metatable
local index_mt = {}
-- all the magic
local track = nil -- forward declaration
track =
function (self, name_table)
name_table = name_table or { '<unknown>' }
local tmp = {}
printf('\tadding: [%s]\r\n', table.concat(map(name_table, tos), ']['))
tracked[tmp] = self
name_info[tmp] = name_table
-- descendantly add tables to track
for k, v in pairs(self) do
if type(v) == 'table' then
local names = { unpack(name_table) }
tins(names, k)
self[k] = track(v, names)
end
end
setmeta(tmp, index_mt)
return tmp
end
local untrack = nil -- forward declaration
untrack =
function (t)
local self = tracked[t]
for k, v in pairs(self) do
if tracked[v] ~= nil then
-- retrieve our real table-elements
self[k] = untrack(v)
end
end
printf('\tremove: [%s]\r\n', table.concat(map(name_info[t], tos), ']['))
tracked[t] = nil
return self
end
index_mt.__index =
function (t, k)
local self = t
-- find our real table with the t userdata
t = assert(tracked[t], 'attempt to index a nil value')
local v = t[k]
-- don't trigger if the element
-- we're accessing is also tracked
if tracked[v] ~= nil then
printf('\taccess: [%s]\r\n', table.concat(tins(map(name_info[self], tos), tos(k)), ']['))
end
return v -- this can be nil
end
index_mt.__newindex =
function (t, k, v)
local self = t
t = assert(tracked[t], 'attempt to index a nil value')
-- track inner tables as well
if type(v) == 'table' then
local tmp = { unpack(name_info[self]) }
tins(tmp, k)
if tracked[t[k]] then
untrack(t[k])
end
t[k] = track(v, tmp)
else
t[k] = v
end
printf('\tupdate: [%s] = %s\r\n', table.concat(tins(map(name_info[self], tos), tos(k)), ']['), tos(v))
end
-- for lua 5.2
index_mt.__pairs =
function (s)
return pairs(tracked[s])
end
local blah = { a = { b = { c = {}, d = {}, e = {} } } }
--blah = track(blah, '[' .. tos('blah') .. ']')
blah = track(blah, { 'blah' })
-- table to track, parent, name of table
--blah = track(blah, _G, 'blah')
print(blah.a)
for k, v in pairs(blah) do
print(k, v)
end