cross-posted from: https://lemmy.nz/post/4294116

I have a file with content like this:

item({
     ["attr"] = {
        ["size"] = "62091";
        ["filename"] = "qBuUP9-OTfuzibt6PQX4-g.jpg";
        ["stamp"] = "2023-12-05T19:31:37Z";
        ["xmlns"] = "urn:xmpp:http:upload:0";
        ["content-type"] = "image/jpeg";
     };
     ["key"] = "Wa4AJWFldqRZjBozponbSLRZ";
     ["with"] = "email@address";
     ["when"] = 1701804697;
     ["name"] = "request";
});

I need to know what format this is, and if there exists a tool in linux already to parse this or if I need to write one myself?

Thanks!

It’s not really a standalone file format, it’s executable Lua code.

It returns a new item with the given table contents.

That syntax with the keys in square brackets is the “long-form” method of creating a new table, that’s allows the use of spaces and dashes in the key name.

https://stackoverflow.com/questions/34687498/what-is-the-function-of-square-brackets-around-table-keys-in-lua

Maybe this is the lua-equivelent of a python Pickle file?

∟⊔⊤∦∣≶
creator
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81Y

Ohhhhh…

Ok so I just have to write a bit of Lua to utilise the file and give me the info I want.

Thanks!

assuming you run it in the right lua environment. The item function must be defined, and we’re only speculating about its return value without seeing proper docs, or the source

∟⊔⊤∦∣≶
creator
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51Y

Item is a function?

Well actually, yeah thats kinda obvious isn’t it now I look at the whole thing.

Thats fine, I’ll just use a bit of the old sed and json it.

Aha I have avoided learning Lua yet again!

the code is constructing a table, and passing it to a function called item. But if all you need is the data, you can just remove the function call and assign the table to a variable like so: local myvar = {…}.

then you can just manipulate the table as usual.

actually those semicolons indicate this isn’t actually lua, they are invalid in table constructors afaik

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creator
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31Y

Unfortunately, this sequence is repeated many many times, so I would need to do a for-each and construct a new table for each inner section…

There’s gotta be a better way. Time to read the source code and hijack whatever item() is doing.

@Jummit@lemmy.one
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1Y

This isn’t Lua code, Lua requires commas as separators for table items.

EDIT: Retracted, it seems like Lua allows this madness

Celediel
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61Y

Lua isn’t that picky.

Wow. Seems like I will never stop learning new things about Lua.

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