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优化json库的utf8转码逻辑

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MrZ626
2021-02-06 23:54:08 +08:00
parent 38fd971d5c
commit a8387de735
1 changed files with 4 additions and 6 deletions
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10
Zframework/toolfunc.lua
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@@ -332,17 +332,15 @@ do--json
local function codepoint_to_utf8(n)
-- http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=iws-appendixa
local f = math.floor
local f = bit.rshift
if n <= 0x7f then
return char(n)
elseif n <= 0x7ff then
return char(f(n / 64) + 192, n % 64 + 128)
return char(f(n, 6) + 192, n % 64 + 128)
elseif n <= 0xffff then
return char(f(n / 4096) + 224, f(n % 4096 / 64) + 128,
n % 64 + 128)
return char(f(n, 12) + 224, f(n % 4096, 6) + 128, n % 64 + 128)
elseif n <= 0x10ffff then
return char(f(n / 262144) + 240, f(n % 262144 / 4096) + 128,
f(n % 4096 / 64) + 128, n % 64 + 128)
return char(f(n, 18) + 240, f(n % 262144, 12) + 128, f(n % 4096, 6) + 128, n % 64 + 128)
end
error(string.format("invalid unicode codepoint '%x'", n))
end