mirror of
https://gerrit.wikimedia.org/r/mediawiki/extensions/Scribunto
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100 lines
1.8 KiB
Lua
100 lines
1.8 KiB
Lua
--[[---------------
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Hex v0.4
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-------------------
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Hex conversion lib for lua.
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How to use:
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hex.to_hex(n) -- convert a number to a hex string
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hex.to_dec(hex) -- convert a hex string(prefix with '0x' or '0X') to number
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Part of LuaBit(http://luaforge.net/projects/bit/).
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Under the MIT license.
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copyright(c) 2006~2007 hanzhao (abrash_han@hotmail.com)
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2013-02-20: Brad Jorsch: Fix to not try messing with globals, doesn't work in Scribunto
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--]]---------------
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local bit = require 'bit'
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do
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local function to_hex(n)
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if(type(n) ~= "number") then
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error("non-number type passed in.")
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end
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-- checking not float
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if(n - math.floor(n) > 0) then
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error("trying to apply bitwise operation on non-integer!")
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end
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if(n < 0) then
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-- negative
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n = bit.tobits(bit.bnot(math.abs(n)) + 1)
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n = bit.tonumb(n)
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end
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hex_tbl = {'A', 'B', 'C', 'D', 'E', 'F'}
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hex_str = ""
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while(n ~= 0) do
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last = math.mod(n, 16)
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if(last < 10) then
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hex_str = tostring(last) .. hex_str
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else
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hex_str = hex_tbl[last-10+1] .. hex_str
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end
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n = math.floor(n/16)
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end
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if(hex_str == "") then
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hex_str = "0"
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end
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return "0x" .. hex_str
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end
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local function to_dec(hex)
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if(type(hex) ~= "string") then
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error("non-string type passed in.")
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end
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head = string.sub(hex, 1, 2)
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if( head ~= "0x" and head ~= "0X") then
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error("wrong hex format, should lead by 0x or 0X.")
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end
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v = tonumber(string.sub(hex, 3), 16)
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return v;
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end
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--------------------
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-- hex lib interface
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local hex = {
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to_dec = to_dec,
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to_hex = to_hex,
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}
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return hex
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end
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--[[
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-- test
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d = 4341688
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h = to_hex(d)
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print(h)
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print(to_dec(h))
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for i = 1, 100000 do
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h = hex.to_hex(i)
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d = hex.to_dec(h)
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if(d ~= i) then
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error("failed " .. i .. ", " .. h)
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end
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end
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--]]
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