Module:User:Theknightwho/lua-uca/serpent

local n, v = "serpent", "0.303" -- (C) 2012-18 Paul Kulchenko; MIT License local c, d = "Paul Kulchenko", "Lua serializer and pretty printer" local snum = {[tostring(1/0)]='1/0 --math.huge',[tostring(-1/0)]='-1/0 ---math.huge',[tostring(0/0)]='0/0'} local badtype = {thread = true, userdata = true, cdata = true} local getmetatable = debug and debug.getmetatable or getmetatable local pairs = function(t) return next, t end -- avoid using __pairs in Lua 5.2+ local keyword, globals, G = {}, {}, (_G or _ENV) for _,k in ipairs({'and', 'break', 'do', 'else', 'elseif', 'end', 'false',	'for', 'function', 'goto', 'if', 'in', 'local', 'nil', 'not', 'or', 'repeat',	'return', 'then', 'true', 'until', 'while'}) do keyword[k] = true end for k,v in pairs(G) do globals[v] = k end -- build func to name mapping for _,g in ipairs({'coroutine', 'debug', 'io', 'math', 'string', 'table', 'os'}) do	for k,v in pairs(type(G[g]) == 'table' and G[g] or {}) do globals[v] = g..'.'..k end end

local function s(t, opts) local name, indent, fatal, maxnum = opts.name, opts.indent, opts.fatal, opts.maxnum local sparse, custom, huge = opts.sparse, opts.custom, not opts.nohuge local space, maxl = (opts.compact and '' or ' '), (opts.maxlevel or math.huge) local maxlen, metatostring = tonumber(opts.maxlength), opts.metatostring local iname, comm = '_'..(name or ''), opts.comment and (tonumber(opts.comment) or math.huge) local numformat = opts.numformat or "%.17g" local seen, sref, syms, symn = {}, {'local '..iname..'={}'}, {}, 0 local function gensym(val) return '_'..(tostring(tostring(val)):gsub("[^%w]",""):gsub("(%d%w+)", -- tostring(val) is needed because __tostring may return a non-string value function(s) if not syms[s] then symn = symn+1; syms[s] = symn end return tostring(syms[s]) end)) end local function safestr(s) return type(s) == "number" and (huge and snum[tostring(s)] or numformat:format(s)) or type(s) ~= "string" and tostring(s) -- escape NEWLINE/010 and EOF/026 or ("%q"):format(s):gsub("\010","n"):gsub("\026","\\026") end -- handle radix changes in some locales if opts.fixradix and (".1f"):format(1.2) ~= "1.2" then local origsafestr = safestr safestr = function(s) return type(s) == "number" and (nohuge and snum[tostring(s)] or numformat:format(s):gsub(",",".")) or origsafestr(s) end end local function comment(s,l) return comm and (l or 0) < comm and ' --'..select(2, pcall(tostring, s)).. or  end local function globerr(s,l) return globals[s] and globals[s]..comment(s,l) or not fatal and safestr(select(2, pcall(tostring, s))) or error("Can't serialize "..tostring(s)) end local function safename(path, name) -- generates foo.bar, foo[3], or foo['b a r'] local n = name == nil and '' or name local plain = type(n) == "string" and n:match("^[%l%u_][%w_]*$") and not keyword[n] local safe = plain and n or '['..safestr(n)..']' return (path or )..(plain and path and '.' or )..safe, safe end local alphanumsort = type(opts.sortkeys) == 'function' and opts.sortkeys or function(k, o, n) -- k=keys, o=originaltable, n=padding local maxn, to = tonumber(n) or 12, {number = 'a', string = 'b'} local function padnum(d) return ("%0"..tostring(maxn).."d"):format(tonumber(d)) end table.sort(k, function(a,b)			-- sort numeric keys first: k[key] is not nil for numerical keys			return (k[a] ~= nil and 0 or to[type(a)] or 'z')..(tostring(a):gsub("%d+",padnum))					 < (k[b] ~= nil and 0 or to[type(b)] or 'z')..(tostring(b):gsub("%d+",padnum)) end) end local function val2str(t, name, indent, insref, path, plainindex, level) local ttype, level, mt = type(t), (level or 0), getmetatable(t) local spath, sname = safename(path, name) local tag = plainindex and ((type(name) == "number") and  or name..space..'='..space) or			(name ~= nil and sname..space..'='..space or ) if seen[t] then -- already seen this element sref[#sref+1] = spath..space..'='..space..seen[t] return tag..'nil'..comment('ref', level) end -- protect from those cases where __tostring may fail if type(mt) == 'table' and metatostring ~= false then local to, tr = pcall(function return mt.__tostring(t) end) local so, sr = pcall(function return mt.__serialize(t) end) if (to or so) then -- knows how to serialize itself seen[t] = insref or spath t = so and sr or tr				ttype = type(t) end -- new value falls through to be serialized end if ttype == "table" then if level >= maxl then return tag..'{}'..comment('maxlvl', level) end seen[t] = insref or spath if next(t) == nil then return tag..'{}'..comment(t, level) end -- table empty if maxlen and maxlen < 0 then return tag..'{}'..comment('maxlen', level) end local maxn, o, out = math.min(#t, maxnum or #t), {}, {} for key = 1, maxn do o[key] = key end if not maxnum or #o < maxnum then local n = #o -- n = n + 1; o[n] is much faster than o[#o+1] on large tables for key in pairs(t) do					if o[key] ~= key then n = n + 1; o[n] = key end end end if maxnum and #o > maxnum then o[maxnum+1] = nil end if opts.sortkeys and #o > maxn then alphanumsort(o, t, opts.sortkeys) end local sparse = sparse and #o > maxn -- disable sparsness if only numeric keys (shorter output) for n, key in ipairs(o) do				local value, ktype, plainindex = t[key], type(key), n <= maxn and not sparse if opts.valignore and opts.valignore[value] -- skip ignored values; do nothing or opts.keyallow and not opts.keyallow[key] or opts.keyignore and opts.keyignore[key] or opts.valtypeignore and opts.valtypeignore[type(value)] -- skipping ignored value types or sparse and value == nil then -- skipping nils; do nothing elseif ktype == 'table' or ktype == 'function' or badtype[ktype] then if not seen[key] and not globals[key] then sref[#sref+1] = 'placeholder' local sname = safename(iname, gensym(key)) -- iname is table for local variables sref[#sref] = val2str(key,sname,indent,sname,iname,true) end sref[#sref+1] = 'placeholder' local path = seen[t]..'['..tostring(seen[key] or globals[key] or gensym(key))..']' sref[#sref] = path..space..'='..space..tostring(seen[value] or val2str(value,nil,indent,path)) else out[#out+1] = val2str(value,key,indent,nil,seen[t],plainindex,level+1) if maxlen then maxlen = maxlen - #out[#out] if maxlen < 0 then break end end end end local prefix = string.rep(indent or '', level) local head = indent and '{\n'..prefix..indent or '{' local body = table.concat(out, ','..(indent and '\n'..prefix..indent or space)) local tail = indent and "\n"..prefix..'}' or '}' return (custom and custom(tag,head,body,tail,level) or tag..head..body..tail)..comment(t, level) elseif badtype[ttype] then seen[t] = insref or spath return tag..globerr(t, level) elseif ttype == 'function' then seen[t] = insref or spath if opts.nocode then return tag.."function --..skipped.. end"..comment(t, level) end local ok, res = pcall(string.dump, t)			local func = ok and "((loadstring or load)("..safestr(res)..",'@serialized'))"..comment(t, level) return tag..(func or globerr(t, level)) else return tag..safestr(t) end -- handle all other types end local sepr = indent and "\n" or ";"..space local body = val2str(t, name, indent) -- this call also populates sref local tail = #sref>1 and table.concat(sref, sepr)..sepr or '' local warn = opts.comment and #sref>1 and space.."--incomplete output with shared/self-references skipped" or '' return not name and body..warn or "do local "..body..sepr..tail.."return "..name..sepr.."end" end

local function deserialize(data, opts) local env = (opts and opts.safe == false) and G		or setmetatable({}, {				__index = function(t,k) return t end,				__call = function(t,...) error("cannot call functions") end			}) local f, res = (loadstring or load)('return '..data, nil, nil, env) if not f then f, res = (loadstring or load)(data, nil, nil, env) end if not f then return f, res end if setfenv then setfenv(f, env) end return pcall(f) end

local function merge(a, b) if b then for k,v in pairs(b) do a[k] = v end end; return a; end return { _NAME = n, _COPYRIGHT = c, _DESCRIPTION = d, _VERSION = v, serialize = s,	load = deserialize, dump = function(a, opts) return s(a, merge({name = '_', compact = true, sparse = true}, opts)) end, line = function(a, opts) return s(a, merge({sortkeys = true, comment = true}, opts)) end, block = function(a, opts) return s(a, merge({indent = '	', sortkeys = true, comment = true}, opts)) end }