save lua-table to lua-script

[AntonioModer]

Save number, string, boolean, table of any depth - in text; functions - in "Lua byte-code".
Don't save userdata, thread, nil.

main.lua

v 0.62

(6.82 KiB) Downloaded 215 times

Search output file in LOVE/yourProgramName/appData (see http://www.love2d.org/wiki/love.filesystem)
Output file "savedTable.lua" (from this example ):

savedTable.lua

example output

(1.83 KiB) Downloaded 207 times

tag: lua serialization.

[Robin]

This has a number of problems:

1. It can't handle string values with embedded " characters.
2. It can't handle table keys at all.
3. String keys are handled wrong: keywords and non-identifier string keys need to use the ["key"] = syntax, not the key = syntax.
4. If you have a table value, it always treats the key as an identifier, so {{}, {}} becomes:

   Code: Select all

   return
   {
   1 = {
       },
   2 = {
       },
   }

   Which is obviously wrong.
5. It can't deal with cyclic tables.
6. I may have missed a few issues.

[AntonioModer]

This has a number of problems: ...

Thanks !

[Centauri Soldier]

Here's a link to my recursive table.tostring function. It handles everything except userdata.

https://github.com/CentauriSoldier/Open ... /table.lua

[Robin]

Here's a link to my recursive table.tostring function. It handles everything except userdata.

https://github.com/CentauriSoldier/Open ... /table.lua

Since I'm being nitpicky:

1. It is very Windows-centric:
   • It doesn't escape \r and \n separately, which results in plain invalid Lua.
   • The output lines are separated by \r\n as well. I suggest using just \n there and opening the file in 'w' instead of 'wb'.
2. Try {["007"] = "somestring"}. The output will be

   Code: Select all

   {
       007 = "somestring",
   }

   To fix that use string.find(vIndex, '[a-zA-Z_][a-zA-Z0-9_]*') instead of string.find(vIndex, '%W', 1)
3. The indentation of your code is fucked up in many places.
4. Numeric keys have the indentation of their parent, instead of that of their string siblings.
5. No support for keys that are not numbers or strings.

[Centauri Soldier]

Thank you for you suggestions, Robin, I'll look into those problems.

BTW, aren't all keys in a lua table either numbers or strings?

[slime]

BTW, aren't all keys in a lua table either numbers or strings?

Keys can be anything - numbers, strings, booleans, functions, userdata, or tables.

[Centauri Soldier]

I've been programming in lua for years and didn't know that, thanks guys.

Also, Robin, your string search didn't work either so I just wrapped all string and number indices in quotes for simplicity.
Well, try that then, see how it suits you now.
Thanks for all the feedback , keep it coming.

Tested this and it worked.

Code: Select all

local tTest = {
	SomeKey = "sdfkljsdf",
	["My Sub Table"] = {"a","b","c","d","e","f","g"},
	["MySecondSubTable"] = {
		[1] = {
			[1] = 1,
			[2] = 1,
			[3] = 1,
			[4] = 1,
			[5] = 1,
			[6] = 1,
		},
		[2] = "o",
		[3] = love.graphics.getHeight,
		[4] = {"q","r","s","t",},
		[5] = 3,
		[6] = "poi",
	},
	["007"] = "Bond",
	[true]="This is a second type of key",
	[false]="This is a false key",
	[love.graphics.getWidth] = {},
	[{[1]=5}] = "1",
};


table.dump(love.filesystem.getSaveDirectory().."/test.lua", tTest, false, true);

[Robin]

Also, Robin, your string search didn't work either so I just wrapped all string and number indices in quotes for simplicity.

Hm, odd. I'd swear that would work. Anyway, yeah, that works.

[xXxMoNkEyMaNxXx]

I'm eager for criticism on my table serializing function!

Code: Select all

local next=next
local type=type
local tostring=tostring

local format=string.format

local sort=table.sort
local concat=table.concat

local function serialize(t)
	local TYPE=type(t)
	if TYPE=="boolean" or TYPE=="number" then
		return tostring(t)
	elseif TYPE=="string" then
		return format("%q",t)
	elseif TYPE=="table" then
		local ret={}
		local r_v={}
		local n=0
		for i,v in next,t do
			local sv=serialize(v)
			ret[#ret+1]="["..serialize(i).."]="..sv
			r_v[i]=sv
			n=n+1
		end
		if n==#t then
			return "{"..concat(r_v,",").."}"
		else
			sort(ret)
			return "{"..concat(ret,",").."}"
		end
	else
		return "&"..TYPE.."="..format("%q",tostring(t))
	end
end