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