改造Lua的debug.traceback() 讓其顯示棧上所有的局部變量

function tracebackex()
local ret = ""
local level = 2
ret = ret .. "stack traceback:\n"
while true do
--get stack info
local info = debug.getinfo(level, "Sln")
if not info then break end
if info.what == "C" then -- C function
ret = ret .. tostring(level) .. "\tC function\n"
else -- Lua function
ret = ret .. string.format("\t[%s]:%d in function `%s`\n", info.short_src, info.currentline, info.name or "")
end
--get local vars
local i = 1
while true do
local name, value = debug.getlocal(level, i)
if not name then break end
ret = ret .. "\t\t" .. name .. " =\t" .. tostringex(value, 3) .. "\n"
i = i + 1
end
level = level + 1
end
return ret
end
function tostringex(v, len)
if len == nil then len = 0 end
local pre = string.rep('\t', len)
local ret = ""
if type(v) == "table" then
if len > 5 then return "\t{ ... }" end
local t = ""
for k, v1 in pairs(v) do
t = t .. "\n\t" .. pre .. tostring(k) .. ":"
t = t .. tostringex(v1, len + 1)
end
if t == "" then
ret = ret .. pre .. "{ }\t(" .. tostring(v) .. ")"
else
if len > 0 then
ret = ret .. "\t(" .. tostring(v) .. ")\n"
end
ret = ret .. pre .. "{" .. t .. "\n" .. pre .. "}"
end
else
ret = ret .. pre .. tostring(v) .. "\t(" .. type(v) .. ")"
end
return ret
end