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- --[[--
- num_args takes in 5.1 byte code and extracts the number of arguments
- from its function header.
- --]]--
- function int(t)
- return t:byte(1)+t:byte(2)*0x100+t:byte(3)*0x10000+t:byte(4)*0x1000000
- end
- function num_args(func)
- local dump = string.dump(func)
- local offset, cursor = int(dump:sub(13)), offset + 26
- --Get the params and var flag (whether there's a ... in the param)
- return dump:sub(cursor):byte(), dump:sub(cursor+1):byte()
- end
- -- Usage:
- num_args(function(a,b,c,d, ...) end) -- return 4, 7
- -- Python styled string format operator
- local gm = debug.getmetatable("")
- gm.__mod=function(self, other)
- if type(other) ~= "table" then other = {other} end
- for i,v in ipairs(other) do other[i] = tostring(v) end
- return self:format(unpack(other))
- end
- print([===[
- blah blah %s, (%d %d)
- ]===]%{"blah", num_args(int)})
- --[=[--
- table.maxn is deprecated, use # instead.
- --]=]--
- print(table.maxn{1,2,[4]=4,[8]=8) -- outputs 8 instead of 2
- print(5 --[[ blah ]])
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