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|
-- serialize.lua
-- Lua-conformant library file that has no minetest dependencies
-- Contains the serialization and deserialization routines
--[[
Version history:
1 - initial
2 - also escaping CR character as &r
Structure of entry:
[keytype][key]:[valuetype][val]
Types:
B - bool
-> 0=false, 1=true
S - string
-> see below
N - number
-> thing compatible with tonumber()
Table:
[keytype][key]:T
... content is nested in table until the matching
E
example:
LUA_SER v=2 {
Skey:Svalue key = "value",
N1:Seins [1] = "eins",
B1:T [true] = {
Sa:Sb a = "b",
Sc:B0 c = false,
E }
E }
String representations:
In strings the following characters are escaped by &
'&' -> '&&'
(line break) -> '&n'
(CR) -> '&r'
':' -> '&:'
All other characters are unchanged as they bear no special meaning.
]]
local write_table, literal_to_string, escape_chars, table_is_empty
function table_is_empty(t)
for _,_ in pairs(t) do
return false
end
return true
end
function write_table(t, file, config)
local ks, vs, writeit, istable
for key, value in pairs(t) do
ks = value_to_string(key, false)
writeit = true
istable = type(value)=="table"
if istable then
vs = "T"
if config and config.skip_empty_tables then
writeit = not table_is_empty(value)
end
else
vs = value_to_string(value, true)
end
if writeit then
file:write(ks..":"..vs.."\n")
if istable then
write_table(value, file, config)
file:write("E\n")
end
end
end
end
function value_to_string(t)
if type(t)=="table" then
file:close()
error("Can not serialize a table in the key position!")
elseif type(t)=="boolean" then
if t then
return "B1"
else
return "B0"
end
elseif type(t)=="number" then
return "N"..t
elseif type(t)=="string" then
return "S"..escape_chars(t)
else
--error("Can not serialize '"..type(t).."' type!")
return "S<function>"
end
return str
end
function escape_chars(str)
|
