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Added support for decoing surrogate pairs

master
rxi 2015-08-12 19:37:03 +01:00
parent f36b2f34b7
commit 10811fbad7
1 changed files with 27 additions and 5 deletions
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32
json.lua
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@ -161,19 +161,37 @@ local function decode_error(str, idx, msg)
end
local function parse_unicode_escape(s)
local n = tonumber( s:sub(3), 16 )
local function codepoint_to_utf8(n)
-- http://scripts.sil.org/cms/scripts/page.php?site_id=nrsi&id=iws-appendixa
if n <= 0x7f then
return string.char(n)
elseif n <= 0x7ff then
return string.char(n / 64 + 192, n % 64 + 128)
end
elseif n <= 0xffff then
return string.char(n / 4096 + 224, 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)
end
error( string.format("invalid unicode codepoint '%x'", n) )
end
local function parse_unicode_escape(s)
local n1 = tonumber( s:sub(3, 6), 16 )
local n2 = tonumber( s:sub(9, 12), 16 )
-- Surrogate pair?
if n2 then
return codepoint_to_utf8((n1 - 0xd800) * 0x400 + (n2 - 0xdc00) + 0x10000)
else
return codepoint_to_utf8(n1)
end
end
local function parse_string(str, i, chr)
local has_unicode_escape = false
local has_surrogate_escape = false
local has_escape = false
local last
for j = i + 1, #str do
@ -190,9 +208,10 @@ local function parse_string(str, i, chr)
decode_error(str, j, "invalid unicode escape in string")
end
if hex:find("^[dD][89aAbB]") then
decode_error(str, j, "unsupported utf-16 surrogate pair in string")
end
has_surrogate_escape = true
else
has_unicode_escape = true
end
else
has_escape = true
end
@ -202,6 +221,9 @@ local function parse_string(str, i, chr)
elseif x == '"' then
local s = str:sub(i + 1, j - 1)
if has_surrogate_escape then
s = s:gsub("\\u[dD][89aAbB]..\\u....", parse_unicode_escape)
end
if has_unicode_escape then
s = s:gsub("\\u....", parse_unicode_escape)
end