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调整string扩展模块utf8转码函数

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MrZ626
2021-10-13 09:07:59 +08:00
parent 154157b976
commit 73bc5dd30e
1 changed files with 9 additions and 11 deletions
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20
Zframework/stringExtend.lua
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@@ -1,6 +1,6 @@
local data=love.data
local STRING={}
local tostring=tostring
local assert,tostring,tonumber=assert,tostring,tonumber
local int,format=math.floor,string.format
local find,sub,upper=string.find,string.sub,string.upper
local char,byte=string.char,string.byte
@@ -69,17 +69,15 @@ function STRING.time(t)
end
end
function STRING.hexToUTF8(str)--[LOW PERFORMENCE] hex unicode to UTF8
assert(type(str)=='string',"Wrong input: "..tostring(str))
local n=tonumber(str,16)
assert(n and n==int(n),"Wrong unicode str: "..str)
function STRING.UTF8(n)--Simple utf8 coding
assert(type(n)=='number',"Wrong type ("..type(n)..")")
assert(n>=0 and n<2^31,"Out of range ("..n..")")
if n<2^7 then return char(n)
elseif n<2^11 then return char(128+64+int(n/2^6),128+n%2^6)
elseif n<2^16 then return char(128+64+32+int(n/2^12),128+int(n/2^6)%2^6,128+n%2^6)
elseif n<2^21 then return char(128+64+32+16+int(n/2^18),128+int(n/2^12)%2^6,128+int(n/2^6)%2^6,128+n%2^6)
elseif n<2^26 then return char(128+64+32+16+8+int(n/2^24),128+int(n/2^18)%2^6,128+int(n/2^12)%2^6,128+int(n/2^6)%2^6,128+n%2^6)
elseif n<2^31 then return char(128+64+32+16+8+4+int(n/2^30),128+int(n/2^24)%2^6,128+int(n/2^18)%2^6,128+int(n/2^12)%2^6,128+int(n/2^6)%2^6,128+n%2^6)
else error("Wrong unicode str: "..str)
elseif n<2^11 then return char(192+int(n/2^06),128+n%2^6)
elseif n<2^16 then return char(224+int(n/2^12),128+int(n/2^06)%2^6,128+n%2^6)
elseif n<2^21 then return char(240+int(n/2^18),128+int(n/2^12)%2^6,128+int(n/2^06)%2^6,128+n%2^6)
elseif n<2^26 then return char(248+int(n/2^24),128+int(n/2^18)%2^6,128+int(n/2^12)%2^6,128+int(n/2^06)%2^6,128+n%2^6)
elseif n<2^31 then return char(252+int(n/2^30),128+int(n/2^24)%2^6,128+int(n/2^18)%2^6,128+int(n/2^12)%2^6,128+int(n/2^06)%2^6,128+n%2^6)
end
end