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Fixed codepoint_to_utf8()'s string.char usage for Lua5.3 

Lua5.3 requires that string.char's arguments are integers (<=5.2 and JIT
do not)
pull/6/head
rxi 2015-08-15 10:52:31 +01:00
parent b51b7a53f7
commit 3cfffd299e
1 changed files with 5 additions and 4 deletions
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json.lua
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@ -163,15 +163,16 @@ end
local function codepoint_to_utf8(n)
-- http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=iws-appendixa
local f = math.floor
if n <= 0x7f then
return string.char(n)
elseif n <= 0x7ff then
return string.char(n / 64 + 192, n % 64 + 128)
return string.char(f(n / 64) + 192, n % 64 + 128)
elseif n <= 0xffff then
return string.char(n / 4096 + 224, n % 4096 / 64 + 128, n % 64 + 128)
return string.char(f(n / 4096) + 224, f(n % 4096 / 64) + 128, n % 64 + 128)
elseif n <= 0x10ffff then
return string.char(n / 262144 + 240, n % 262144 / 4096 + 128,
n % 4096 / 64 + 128, n % 64 + 128)
return string.char(f(n / 262144) + 240, f(n % 262144 / 4096) + 128,
f(n % 4096 / 64) + 128, n % 64 + 128)
end
error( string.format("invalid unicode codepoint '%x'", n) )
end