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local table_sort = table.sort
local string_rep = string.rep
local type = type
local pairs = pairs
local ipairs = ipairs
local math_type = math.type
local TAB = setmetatable({}, { __index = function (self, n)
self[n] = string_rep('\t', n)
return self[n]
end})
local KEY = {}
function table.dump(tbl)
if type(tbl) ~= 'table' then
error('Must be a table')
end
local table_mark = {}
local lines = {}
lines[#lines+1] = '{'
local function unpack(tbl, tab)
if table_mark[tbl] then
error('Cyclic references are not allowed.')
end
table_mark[tbl] = true
local keys = {}
for key in pairs(tbl) do
if type(key) == 'string' then
if key:find('[^%w_]') then
KEY[key] = ('[%q]'):format(key)
else
KEY[key] = key
end
elseif math_type(key) == 'integer' then
KEY[key] = ('[%d]'):format(key)
else
error('Key must be `string` or `integer`')
end
keys[#keys+1] = key
end
table_sort(keys, function (a, b)
return KEY[a] < KEY[b]
end)
for _, key in ipairs(keys) do
local value = tbl[key]
local tp = type(value)
if tp == 'table' then
lines[#lines+1] = ('%s%s = {'):format(TAB[tab+1], KEY[key])
unpack(value, tab+1)
lines[#lines+1] = ('%s},'):format(TAB[tab+1])
elseif tp == 'string' or tp == 'number' or tp == 'boolean' then
lines[#lines+1] = ('%s%s = %q,'):format(TAB[tab+1], KEY[key], value)
else
error(('Unsupport value type: [%s]'):format(tp))
end
end
end
unpack(tbl, 0)
lines[#lines+1] = '}'
return table.concat(lines, '\n')
end
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