Parsing in a coroutine

[rpatters1]

Hello. Thank you for xml2lua. It is pretty close to ideal for my use case.

I am parsing a rather large xml file (2MB+) into tables in lua for later processing. This takes a few seconds and has to be done every time the script runs. For that reason, I would like to run it in a coroutine and yield back to the caller on a periodic basis. This might be after every top-level tag or configurable to be after every tag of a specified name.

I thought I saw a reference to callback functions in the docs, but now I'm not finding it. Is there a callback mechanism already built into the parser? If not, would it be hard to add? (I don't mind taking a stab at it myself if you want to point me in the right direction.)

Thanks

[rpatters1]

As a followup, I got something working as follows (all within a coroutine):

local handler = require("xmlhandler.tree")
local counter = 0
local myhandler = handler:new()
local org_text = myhandler.text
myhandler.text = function(handler, text)
             if (counter % 50) == 0 then
                 coroutine.yield()
             end
             counter = counter + 1
             return org_text(handler, text)
        end
local myparser = xml2lua.parser(myhandler)
myparser:parse(xml2lua.loadFile("<my-file-path>"))

But this seems hackish to me. It would be nice if there were a specifically supported parser or handler routine that could be used for it instead.