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util/json.lua @ 5516:9733836629f9
util.json: Make encode(decode("[]"))=="[]".
| author | Waqas Hussain <waqas20@gmail.com> |
|---|---|
| date | Tue, 23 Apr 2013 14:41:52 -0400 |
| parent | 5436:a4ba5819bf50 |
| child | 5517:9d7349bbe4d2 |
| rev | line source |
|---|---|
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1 -- Prosody IM |
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2 -- Copyright (C) 2008-2010 Matthew Wild |
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3 -- Copyright (C) 2008-2010 Waqas Hussain |
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4 -- |
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5 -- utf8char copyright (C) 2007 Rici Lake |
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6 -- |
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7 -- This project is MIT/X11 licensed. Please see the |
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8 -- COPYING file in the source package for more information. |
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9 -- |
| 3979 | 10 |
| 11 local type = type; | |
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12 local t_insert, t_concat, t_remove, t_sort = table.insert, table.concat, table.remove, table.sort; |
| 3979 | 13 local s_char = string.char; |
| 14 local tostring, tonumber = tostring, tonumber; | |
| 15 local pairs, ipairs = pairs, ipairs; | |
| 16 local next = next; | |
| 17 local error = error; | |
| 18 local newproxy, getmetatable = newproxy, getmetatable; | |
| 19 local print = print; | |
| 20 | |
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21 local has_array, array = pcall(require, "util.array"); |
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22 local array_mt = hasarray and getmetatable(array()) or {}; |
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23 |
| 3979 | 24 --module("json") |
| 25 local json = {}; | |
| 26 | |
| 27 local null = newproxy and newproxy(true) or {}; | |
| 28 if getmetatable and getmetatable(null) then | |
| 29 getmetatable(null).__tostring = function() return "null"; end; | |
| 30 end | |
| 31 json.null = null; | |
| 32 | |
| 33 local escapes = { | |
| 34 ["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b", | |
| 35 ["\f"] = "\\f", ["\n"] = "\\n", ["\r"] = "\\r", ["\t"] = "\\t"}; | |
| 36 local unescapes = { | |
| 37 ["\""] = "\"", ["\\"] = "\\", ["/"] = "/", | |
| 38 b = "\b", f = "\f", n = "\n", r = "\r", t = "\t"}; | |
| 39 for i=0,31 do | |
| 40 local ch = s_char(i); | |
| 41 if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end | |
| 42 end | |
| 43 | |
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44 local function utf8char(i) |
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45 if i >= 0 then |
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46 i = i - i%1 |
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47 if i < 128 then |
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48 return s_char(i) |
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49 else |
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50 local c1 = i % 64 |
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51 i = (i - c1) / 64 |
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52 if i < 32 then |
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53 return s_char(0xC0+i, 0x80+c1) |
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54 else |
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55 local c2 = i % 64 |
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56 i = (i - c2) / 64 |
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57 if i < 16 and (i ~= 13 or c2 < 32) then |
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58 return s_char(0xE0+i, 0x80+c2, 0x80+c1) |
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59 elseif i >= 16 and i < 0x110 then |
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60 local c3 = i % 64 |
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61 i = (i - c3) / 64 |
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62 return s_char(0xF0+i, 0x80+c3, 0x80+c2, 0x80+c1) |
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63 end |
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64 end |
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65 end |
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66 end |
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67 end |
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68 |
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69 |
| 3979 | 70 local valid_types = { |
| 71 number = true, | |
| 72 string = true, | |
| 73 table = true, | |
| 74 boolean = true | |
| 75 }; | |
| 76 local special_keys = { | |
| 77 __array = true; | |
| 78 __hash = true; | |
| 79 }; | |
| 80 | |
| 81 local simplesave, tablesave, arraysave, stringsave; | |
| 82 | |
| 83 function stringsave(o, buffer) | |
| 84 -- FIXME do proper utf-8 and binary data detection | |
| 85 t_insert(buffer, "\""..(o:gsub(".", escapes)).."\""); | |
| 86 end | |
| 87 | |
| 88 function arraysave(o, buffer) | |
| 89 t_insert(buffer, "["); | |
| 90 if next(o) then | |
| 91 for i,v in ipairs(o) do | |
| 92 simplesave(v, buffer); | |
| 93 t_insert(buffer, ","); | |
| 94 end | |
| 95 t_remove(buffer); | |
| 96 end | |
| 97 t_insert(buffer, "]"); | |
| 98 end | |
| 99 | |
| 100 function tablesave(o, buffer) | |
| 101 local __array = {}; | |
| 102 local __hash = {}; | |
| 103 local hash = {}; | |
| 104 for i,v in ipairs(o) do | |
| 105 __array[i] = v; | |
| 106 end | |
| 107 for k,v in pairs(o) do | |
| 108 local ktype, vtype = type(k), type(v); | |
| 109 if valid_types[vtype] or v == null then | |
| 110 if ktype == "string" and not special_keys[k] then | |
| 111 hash[k] = v; | |
| 112 elseif (valid_types[ktype] or k == null) and __array[k] == nil then | |
| 113 __hash[k] = v; | |
| 114 end | |
| 115 end | |
| 116 end | |
| 117 if next(__hash) ~= nil or next(hash) ~= nil or next(__array) == nil then | |
| 118 t_insert(buffer, "{"); | |
| 119 local mark = #buffer; | |
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120 if buffer.ordered then |
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121 local keys = {}; |
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122 for k in pairs(hash) do |
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123 t_insert(keys, k); |
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124 end |
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125 t_sort(keys); |
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126 for _,k in ipairs(keys) do |
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127 stringsave(k, buffer); |
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128 t_insert(buffer, ":"); |
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129 simplesave(hash[k], buffer); |
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130 t_insert(buffer, ","); |
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131 end |
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132 else |
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133 for k,v in pairs(hash) do |
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134 stringsave(k, buffer); |
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135 t_insert(buffer, ":"); |
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136 simplesave(v, buffer); |
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137 t_insert(buffer, ","); |
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138 end |
| 3979 | 139 end |
| 140 if next(__hash) ~= nil then | |
| 141 t_insert(buffer, "\"__hash\":["); | |
| 142 for k,v in pairs(__hash) do | |
| 143 simplesave(k, buffer); | |
| 144 t_insert(buffer, ","); | |
| 145 simplesave(v, buffer); | |
| 146 t_insert(buffer, ","); | |
| 147 end | |
| 148 t_remove(buffer); | |
| 149 t_insert(buffer, "]"); | |
| 150 t_insert(buffer, ","); | |
| 151 end | |
| 152 if next(__array) then | |
| 153 t_insert(buffer, "\"__array\":"); | |
| 154 arraysave(__array, buffer); | |
| 155 t_insert(buffer, ","); | |
| 156 end | |
| 157 if mark ~= #buffer then t_remove(buffer); end | |
| 158 t_insert(buffer, "}"); | |
| 159 else | |
| 160 arraysave(__array, buffer); | |
| 161 end | |
| 162 end | |
| 163 | |
| 164 function simplesave(o, buffer) | |
| 165 local t = type(o); | |
| 166 if t == "number" then | |
| 167 t_insert(buffer, tostring(o)); | |
| 168 elseif t == "string" then | |
| 169 stringsave(o, buffer); | |
| 170 elseif t == "table" then | |
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171 local mt = getmetatable(o); |
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172 if mt == array_mt then |
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173 arraysave(o, buffer); |
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174 else |
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175 tablesave(o, buffer); |
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176 end |
| 3979 | 177 elseif t == "boolean" then |
| 178 t_insert(buffer, (o and "true" or "false")); | |
| 179 else | |
| 180 t_insert(buffer, "null"); | |
| 181 end | |
| 182 end | |
| 183 | |
| 184 function json.encode(obj) | |
| 185 local t = {}; | |
| 186 simplesave(obj, t); | |
| 187 return t_concat(t); | |
| 188 end | |
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189 function json.encode_ordered(obj) |
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190 local t = { ordered = true }; |
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191 simplesave(obj, t); |
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192 return t_concat(t); |
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193 end |
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194 function json.encode_array(obj) |
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195 local t = {}; |
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196 arraysave(obj, t); |
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197 return t_concat(t); |
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198 end |
| 3979 | 199 |
| 200 ----------------------------------- | |
| 201 | |
| 202 | |
| 203 function json.decode(json) | |
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204 json = json.." "; -- appending a space ensures valid json wouldn't touch EOF |
| 3979 | 205 local pos = 1; |
| 206 local current = {}; | |
| 207 local stack = {}; | |
| 208 local ch, peek; | |
| 209 local function next() | |
| 210 ch = json:sub(pos, pos); | |
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211 if ch == "" then error("Unexpected EOF"); end |
| 3979 | 212 pos = pos+1; |
| 213 peek = json:sub(pos, pos); | |
| 214 return ch; | |
| 215 end | |
| 216 | |
| 217 local function skipwhitespace() | |
| 218 while ch and (ch == "\r" or ch == "\n" or ch == "\t" or ch == " ") do | |
| 219 next(); | |
| 220 end | |
| 221 end | |
| 222 local function skiplinecomment() | |
| 223 repeat next(); until not(ch) or ch == "\r" or ch == "\n"; | |
| 224 skipwhitespace(); | |
| 225 end | |
| 226 local function skipstarcomment() | |
| 227 next(); next(); -- skip '/', '*' | |
| 228 while peek and ch ~= "*" and peek ~= "/" do next(); end | |
| 229 if not peek then error("eof in star comment") end | |
| 230 next(); next(); -- skip '*', '/' | |
| 231 skipwhitespace(); | |
| 232 end | |
| 233 local function skipstuff() | |
| 234 while true do | |
| 235 skipwhitespace(); | |
| 236 if ch == "/" and peek == "*" then | |
| 237 skipstarcomment(); | |
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238 elseif ch == "/" and peek == "/" then |
| 3979 | 239 skiplinecomment(); |
| 240 else | |
| 241 return; | |
| 242 end | |
| 243 end | |
| 244 end | |
| 245 | |
| 246 local readvalue; | |
| 247 local function readarray() | |
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248 local t = setmetatable({}, array_mt); |
| 3979 | 249 next(); -- skip '[' |
| 250 skipstuff(); | |
| 251 if ch == "]" then next(); return t; end | |
| 252 t_insert(t, readvalue()); | |
| 253 while true do | |
| 254 skipstuff(); | |
| 255 if ch == "]" then next(); return t; end | |
| 256 if not ch then error("eof while reading array"); | |
| 257 elseif ch == "," then next(); | |
| 258 elseif ch then error("unexpected character in array, comma expected"); end | |
| 259 if not ch then error("eof while reading array"); end | |
| 260 t_insert(t, readvalue()); | |
| 261 end | |
| 262 end | |
| 263 | |
| 264 local function checkandskip(c) | |
| 265 local x = ch or "eof"; | |
| 266 if x ~= c then error("unexpected "..x..", '"..c.."' expected"); end | |
| 267 next(); | |
| 268 end | |
| 269 local function readliteral(lit, val) | |
| 270 for c in lit:gmatch(".") do | |
| 271 checkandskip(c); | |
| 272 end | |
| 273 return val; | |
| 274 end | |
| 275 local function readstring() | |
| 276 local s = ""; | |
| 277 checkandskip("\""); | |
| 278 while ch do | |
| 279 while ch and ch ~= "\\" and ch ~= "\"" do | |
| 280 s = s..ch; next(); | |
| 281 end | |
| 282 if ch == "\\" then | |
| 283 next(); | |
| 284 if unescapes[ch] then | |
| 285 s = s..unescapes[ch]; | |
| 286 next(); | |
| 287 elseif ch == "u" then | |
| 288 local seq = ""; | |
| 289 for i=1,4 do | |
| 290 next(); | |
| 291 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 | |
| 293 seq = seq..ch; | |
| 294 end | |
|
5436
a4ba5819bf50
util.json: Convert \uXXXX to UTF-8 when decoding
Matthew Wild <mwild1@gmail.com>
parents:
5395
diff
changeset
|
295 s = s..utf8char(tonumber(seq, 16)); |
| 3979 | 296 next(); |
| 297 else error("invalid escape sequence in string"); end | |
| 298 end | |
| 299 if ch == "\"" then | |
| 300 next(); | |
| 301 return s; | |
| 302 end | |
| 303 end | |
| 304 error("eof while reading string"); | |
| 305 end | |
| 306 local function readnumber() | |
| 307 local s = ""; | |
| 308 if ch == "-" then | |
| 309 s = s..ch; next(); | |
| 310 if not ch:match("[0-9]") then error("number format error"); end | |
| 311 end | |
| 312 if ch == "0" then | |
| 313 s = s..ch; next(); | |
| 314 if ch:match("[0-9]") then error("number format error"); end | |
| 315 else | |
| 316 while ch and ch:match("[0-9]") do | |
| 317 s = s..ch; next(); | |
| 318 end | |
| 319 end | |
| 320 if ch == "." then | |
| 321 s = s..ch; next(); | |
| 322 if not ch:match("[0-9]") then error("number format error"); end | |
| 323 while ch and ch:match("[0-9]") do | |
| 324 s = s..ch; next(); | |
| 325 end | |
| 326 if ch == "e" or ch == "E" then | |
| 327 s = s..ch; next(); | |
| 328 if ch == "+" or ch == "-" then | |
| 329 s = s..ch; next(); | |
| 330 if not ch:match("[0-9]") then error("number format error"); end | |
| 331 while ch and ch:match("[0-9]") do | |
| 332 s = s..ch; next(); | |
| 333 end | |
| 334 end | |
| 335 end | |
| 336 end | |
| 337 return tonumber(s); | |
| 338 end | |
| 339 local function readmember(t) | |
|
4147
7f119ebcf55f
util.json: Fixed a parse error caused by unexpected whitespace.
Waqas Hussain <waqas20@gmail.com>
parents:
3979
diff
changeset
|
340 skipstuff(); |
| 3979 | 341 local k = readstring(); |
|
4147
7f119ebcf55f
util.json: Fixed a parse error caused by unexpected whitespace.
Waqas Hussain <waqas20@gmail.com>
parents:
3979
diff
changeset
|
342 skipstuff(); |
| 3979 | 343 checkandskip(":"); |
| 344 t[k] = readvalue(); | |
| 345 end | |
| 346 local function fixobject(obj) | |
| 347 local __array = obj.__array; | |
| 348 if __array then | |
| 349 obj.__array = nil; | |
| 350 for i,v in ipairs(__array) do | |
| 351 t_insert(obj, v); | |
| 352 end | |
| 353 end | |
| 354 local __hash = obj.__hash; | |
| 355 if __hash then | |
| 356 obj.__hash = nil; | |
| 357 local k; | |
| 358 for i,v in ipairs(__hash) do | |
| 359 if k ~= nil then | |
| 360 obj[k] = v; k = nil; | |
| 361 else | |
| 362 k = v; | |
| 363 end | |
| 364 end | |
| 365 end | |
| 366 return obj; | |
| 367 end | |
| 368 local function readobject() | |
| 369 local t = {}; | |
| 370 next(); -- skip '{' | |
| 371 skipstuff(); | |
| 372 if ch == "}" then next(); return t; end | |
| 373 if not ch then error("eof while reading object"); end | |
| 374 readmember(t); | |
| 375 while true do | |
| 376 skipstuff(); | |
| 377 if ch == "}" then next(); return fixobject(t); end | |
| 378 if not ch then error("eof while reading object"); | |
| 379 elseif ch == "," then next(); | |
| 380 elseif ch then error("unexpected character in object, comma expected"); end | |
| 381 if not ch then error("eof while reading object"); end | |
| 382 readmember(t); | |
| 383 end | |
| 384 end | |
| 385 | |
| 386 function readvalue() | |
| 387 skipstuff(); | |
| 388 while ch do | |
| 389 if ch == "{" then | |
| 390 return readobject(); | |
| 391 elseif ch == "[" then | |
| 392 return readarray(); | |
| 393 elseif ch == "\"" then | |
| 394 return readstring(); | |
| 395 elseif ch:match("[%-0-9%.]") then | |
| 396 return readnumber(); | |
| 397 elseif ch == "n" then | |
| 398 return readliteral("null", null); | |
| 399 elseif ch == "t" then | |
| 400 return readliteral("true", true); | |
| 401 elseif ch == "f" then | |
| 402 return readliteral("false", false); | |
| 403 else | |
| 404 error("invalid character at value start: "..ch); | |
| 405 end | |
| 406 end | |
| 407 error("eof while reading value"); | |
| 408 end | |
| 409 next(); | |
| 410 return readvalue(); | |
| 411 end | |
| 412 | |
| 413 function json.test(object) | |
| 414 local encoded = json.encode(object); | |
| 415 local decoded = json.decode(encoded); | |
| 416 local recoded = json.encode(decoded); | |
| 417 if encoded ~= recoded then | |
| 418 print("FAILED"); | |
| 419 print("encoded:", encoded); | |
| 420 print("recoded:", recoded); | |
| 421 else | |
| 422 print(encoded); | |
| 423 end | |
| 424 return encoded == recoded; | |
| 425 end | |
| 426 | |
| 427 return json; |
