prosody
9d7349bbe4d2
util/json.lua

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util/json.lua @ 5517:9d7349bbe4d2

util.json: New, improved, fixed codepoint to UTF-8 conversion.
author Waqas Hussain <waqas20@gmail.com>
date Tue, 23 Apr 2013 15:55:49 -0400
parent 5516:9733836629f9
child 5561:52eef11cd8af
comparison
equal deleted inserted replaced
5516:9733836629f9 5517:9d7349bbe4d2
1 -- Prosody IM 1 -- Prosody IM
2 -- Copyright (C) 2008-2010 Matthew Wild 2 -- Copyright (C) 2008-2010 Matthew Wild
3 -- Copyright (C) 2008-2010 Waqas Hussain 3 -- Copyright (C) 2008-2010 Waqas Hussain
4 --
5 -- utf8char copyright (C) 2007 Rici Lake
6 -- 4 --
7 -- This project is MIT/X11 licensed. Please see the 5 -- This project is MIT/X11 licensed. Please see the
8 -- COPYING file in the source package for more information. 6 -- COPYING file in the source package for more information.
9 -- 7 --
10 8
39 for i=0,31 do 37 for i=0,31 do
40 local ch = s_char(i); 38 local ch = s_char(i);
41 if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end 39 if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end
42 end 40 end
43 41
44 local function utf8char(i) 42 local function codepoint_to_utf8(code)
45 if i >= 0 then 43 if code < 0x80 then return s_char(code); end
46 i = i - i%1 44 local bits0_6 = code % 64;
47 if i < 128 then 45 if code < 0x800 then
48 return s_char(i) 46 local bits6_5 = (code - bits0_6) / 64;
49 else 47 return s_char(0x80 + 0x40 + bits6_5, 0x80 + bits0_6);
50 local c1 = i % 64 48 end
51 i = (i - c1) / 64 49 local bits0_12 = code % 4096;
52 if i < 32 then 50 local bits6_6 = (bits0_12 - bits0_6) / 64;
53 return s_char(0xC0+i, 0x80+c1) 51 local bits12_4 = (code - bits0_12) / 4096;
54 else 52 return s_char(0x80 + 0x40 + 0x20 + bits12_4, 0x80 + bits6_6, 0x80 + bits0_6);
55 local c2 = i % 64 53 end
56 i = (i - c2) / 64
57 if i < 16 and (i ~= 13 or c2 < 32) then
58 return s_char(0xE0+i, 0x80+c2, 0x80+c1)
59 elseif i >= 16 and i < 0x110 then
60 local c3 = i % 64
61 i = (i - c3) / 64
62 return s_char(0xF0+i, 0x80+c3, 0x80+c2, 0x80+c1)
63 end
64 end
65 end
66 end
67 end
68
69 54
70 local valid_types = { 55 local valid_types = {
71 number = true, 56 number = true,
72 string = true, 57 string = true,
73 table = true, 58 table = true,
290 next(); 275 next();
291 if not ch then error("unexpected eof in string"); end 276 if not ch then error("unexpected eof in string"); end
292 if not ch:match("[0-9a-fA-F]") then error("invalid unicode escape sequence in string"); end 277 if not ch:match("[0-9a-fA-F]") then error("invalid unicode escape sequence in string"); end
293 seq = seq..ch; 278 seq = seq..ch;
294 end 279 end
295 s = s..utf8char(tonumber(seq, 16)); 280 s = s..codepoint_to_utf8(tonumber(seq, 16));
296 next(); 281 next();
297 else error("invalid escape sequence in string"); end 282 else error("invalid escape sequence in string"); end
298 end 283 end
299 if ch == "\"" then 284 if ch == "\"" then
300 next(); 285 next();