How to prefix a Lua table?

问题

I have a lua file whose content is lua Table as below: A={}, A.B={}, A.B.C=0;,

The problem is I want to add prefix XYZ before each above statements. So after the parse the database should have something loke this: XYZ.A={}, XYZ.A.B={}, XYZ.A.B.C={},

Any ideas? Thanks in advance

回答1:

You can load the file with XYZ as is environment: loadfile("mydata","t",XYZ). See loadfile in the manual.

This works in Lua 5.2. For Lua 5.1, use loadfile followed by setfenv.

回答2:

If you can afford polluting your global space with A, simply assign it later:

-- load the file
-- if XYZ doesn't exist, XYZ = { A = A } would be probably shorter
XYZ.A = A
A = nil

回答3:

I think this is what you want:

XYZ = {}
XYZ.A = {}
XYZ.A.B = {}
XYZ.A.B.C = 0

回答4:

How about you simply do:

XYZ = {
    A = {
        B = {
            C = 0
        }
    }
}

If you don't want to nest objects so deep then you may do:

XYZ = {
    A = A
}

A = nil

This assumes that you have already declared the object A before.

来源：https://stackoverflow.com/questions/17525622/how-to-prefix-a-lua-table