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forgot to include this, required for minitel

master
XeonSquared 7 months ago
parent
commit
735a8f5ee2
1 changed files with 145 additions and 0 deletions
  1. 145
    0
      lib/serialization.lua

+ 145
- 0
lib/serialization.lua View File

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-- serialization lib borrowed from OpenOS
local serialization = {}

-- delay loaded tables fail to deserialize cross [C] boundaries (such as when having to read files that cause yields)
local local_pairs = function(tbl)
local mt = getmetatable(tbl)
return (mt and mt.__pairs or pairs)(tbl)
end

-- Important: pretty formatting will allow presenting non-serializable values
-- but may generate output that cannot be unserialized back.
function serialization.serialize(value, pretty)
local kw = {["and"]=true, ["break"]=true, ["do"]=true, ["else"]=true,
["elseif"]=true, ["end"]=true, ["false"]=true, ["for"]=true,
["function"]=true, ["goto"]=true, ["if"]=true, ["in"]=true,
["local"]=true, ["nil"]=true, ["not"]=true, ["or"]=true,
["repeat"]=true, ["return"]=true, ["then"]=true, ["true"]=true,
["until"]=true, ["while"]=true}
local id = "^[%a_][%w_]*$"
local ts = {}
local result_pack = {}
local function recurse(current_value, depth)
local t = type(current_value)
if t == "number" then
if current_value ~= current_value then
table.insert(result_pack, "0/0")
elseif current_value == math.huge then
table.insert(result_pack, "math.huge")
elseif current_value == -math.huge then
table.insert(result_pack, "-math.huge")
else
table.insert(result_pack, tostring(current_value))
end
elseif t == "string" then
table.insert(result_pack, (string.format("%q", current_value):gsub("\\\n","\\n")))
elseif
t == "nil" or
t == "boolean" or
pretty and (t ~= "table" or (getmetatable(current_value) or {}).__tostring) then
table.insert(result_pack, tostring(current_value))
elseif t == "table" then
if ts[current_value] then
if pretty then
table.insert(result_pack, "recursion")
return
else
error("tables with cycles are not supported")
end
end
ts[current_value] = true
local f
if pretty then
local ks, sks, oks = {}, {}, {}
for k in local_pairs(current_value) do
if type(k) == "number" then
table.insert(ks, k)
elseif type(k) == "string" then
table.insert(sks, k)
else
table.insert(oks, k)
end
end
table.sort(ks)
table.sort(sks)
for _, k in ipairs(sks) do
table.insert(ks, k)
end
for _, k in ipairs(oks) do
table.insert(ks, k)
end
local n = 0
f = table.pack(function()
n = n + 1
local k = ks[n]
if k ~= nil then
return k, current_value[k]
else
return nil
end
end)
else
f = table.pack(local_pairs(current_value))
end
local i = 1
local first = true
table.insert(result_pack, "{")
for k, v in table.unpack(f) do
if not first then
table.insert(result_pack, ",")
if pretty then
table.insert(result_pack, "\n" .. string.rep(" ", depth))
end
end
first = nil
local tk = type(k)
if tk == "number" and k == i then
i = i + 1
recurse(v, depth + 1)
else
if tk == "string" and not kw[k] and string.match(k, id) then
table.insert(result_pack, k)
else
table.insert(result_pack, "[")
recurse(k, depth + 1)
table.insert(result_pack, "]")
end
table.insert(result_pack, "=")
recurse(v, depth + 1)
end
end
ts[current_value] = nil -- allow writing same table more than once
table.insert(result_pack, "}")
else
error("unsupported type: " .. t)
end
end
recurse(value, 1)
local result = table.concat(result_pack)
if pretty then
local limit = type(pretty) == "number" and pretty or 10
local truncate = 0
while limit > 0 and truncate do
truncate = string.find(result, "\n", truncate + 1, true)
limit = limit - 1
end
if truncate then
return result:sub(1, truncate) .. "..."
end
end
return result
end

function serialization.unserialize(data)
local result, reason = load("return " .. data, "=data", nil, {math={huge=math.huge}})
if not result then
return nil, reason
end
local ok, output = pcall(result)
if not ok then
return nil, output
end
return output
end

return serialization

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