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util/json.lua @ 5395:ec33d72a08b6
util.json: Add json.encode_array() (thanks B)
| author | Matthew Wild <mwild1@gmail.com> |
|---|---|
| date | Thu, 28 Mar 2013 09:31:07 -0400 |
| parent | 4474:b08a46cf06e6 |
| child | 5436:a4ba5819bf50 |
| rev | line source |
|---|---|
| 3979 | 1 |
| 2 local type = type; | |
|
4474
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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3 local t_insert, t_concat, t_remove, t_sort = table.insert, table.concat, table.remove, table.sort; |
| 3979 | 4 local s_char = string.char; |
| 5 local tostring, tonumber = tostring, tonumber; | |
| 6 local pairs, ipairs = pairs, ipairs; | |
| 7 local next = next; | |
| 8 local error = error; | |
| 9 local newproxy, getmetatable = newproxy, getmetatable; | |
| 10 local print = print; | |
| 11 | |
| 12 --module("json") | |
| 13 local json = {}; | |
| 14 | |
| 15 local null = newproxy and newproxy(true) or {}; | |
| 16 if getmetatable and getmetatable(null) then | |
| 17 getmetatable(null).__tostring = function() return "null"; end; | |
| 18 end | |
| 19 json.null = null; | |
| 20 | |
| 21 local escapes = { | |
| 22 ["\""] = "\\\"", ["\\"] = "\\\\", ["\b"] = "\\b", | |
| 23 ["\f"] = "\\f", ["\n"] = "\\n", ["\r"] = "\\r", ["\t"] = "\\t"}; | |
| 24 local unescapes = { | |
| 25 ["\""] = "\"", ["\\"] = "\\", ["/"] = "/", | |
| 26 b = "\b", f = "\f", n = "\n", r = "\r", t = "\t"}; | |
| 27 for i=0,31 do | |
| 28 local ch = s_char(i); | |
| 29 if not escapes[ch] then escapes[ch] = ("\\u%.4X"):format(i); end | |
| 30 end | |
| 31 | |
| 32 local valid_types = { | |
| 33 number = true, | |
| 34 string = true, | |
| 35 table = true, | |
| 36 boolean = true | |
| 37 }; | |
| 38 local special_keys = { | |
| 39 __array = true; | |
| 40 __hash = true; | |
| 41 }; | |
| 42 | |
| 43 local simplesave, tablesave, arraysave, stringsave; | |
| 44 | |
| 45 function stringsave(o, buffer) | |
| 46 -- FIXME do proper utf-8 and binary data detection | |
| 47 t_insert(buffer, "\""..(o:gsub(".", escapes)).."\""); | |
| 48 end | |
| 49 | |
| 50 function arraysave(o, buffer) | |
| 51 t_insert(buffer, "["); | |
| 52 if next(o) then | |
| 53 for i,v in ipairs(o) do | |
| 54 simplesave(v, buffer); | |
| 55 t_insert(buffer, ","); | |
| 56 end | |
| 57 t_remove(buffer); | |
| 58 end | |
| 59 t_insert(buffer, "]"); | |
| 60 end | |
| 61 | |
| 62 function tablesave(o, buffer) | |
| 63 local __array = {}; | |
| 64 local __hash = {}; | |
| 65 local hash = {}; | |
| 66 for i,v in ipairs(o) do | |
| 67 __array[i] = v; | |
| 68 end | |
| 69 for k,v in pairs(o) do | |
| 70 local ktype, vtype = type(k), type(v); | |
| 71 if valid_types[vtype] or v == null then | |
| 72 if ktype == "string" and not special_keys[k] then | |
| 73 hash[k] = v; | |
| 74 elseif (valid_types[ktype] or k == null) and __array[k] == nil then | |
| 75 __hash[k] = v; | |
| 76 end | |
| 77 end | |
| 78 end | |
| 79 if next(__hash) ~= nil or next(hash) ~= nil or next(__array) == nil then | |
| 80 t_insert(buffer, "{"); | |
| 81 local mark = #buffer; | |
|
4474
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
|
82 if buffer.ordered then |
|
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
|
83 local keys = {}; |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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84 for k in pairs(hash) do |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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85 t_insert(keys, k); |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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86 end |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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87 t_sort(keys); |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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88 for _,k in ipairs(keys) do |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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89 stringsave(k, buffer); |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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90 t_insert(buffer, ":"); |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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91 simplesave(hash[k], buffer); |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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92 t_insert(buffer, ","); |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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93 end |
|
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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94 else |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
|
95 for k,v in pairs(hash) do |
|
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
|
96 stringsave(k, buffer); |
|
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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97 t_insert(buffer, ":"); |
|
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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98 simplesave(v, buffer); |
|
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
|
99 t_insert(buffer, ","); |
|
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
|
100 end |
| 3979 | 101 end |
| 102 if next(__hash) ~= nil then | |
| 103 t_insert(buffer, "\"__hash\":["); | |
| 104 for k,v in pairs(__hash) do | |
| 105 simplesave(k, buffer); | |
| 106 t_insert(buffer, ","); | |
| 107 simplesave(v, buffer); | |
| 108 t_insert(buffer, ","); | |
| 109 end | |
| 110 t_remove(buffer); | |
| 111 t_insert(buffer, "]"); | |
| 112 t_insert(buffer, ","); | |
| 113 end | |
| 114 if next(__array) then | |
| 115 t_insert(buffer, "\"__array\":"); | |
| 116 arraysave(__array, buffer); | |
| 117 t_insert(buffer, ","); | |
| 118 end | |
| 119 if mark ~= #buffer then t_remove(buffer); end | |
| 120 t_insert(buffer, "}"); | |
| 121 else | |
| 122 arraysave(__array, buffer); | |
| 123 end | |
| 124 end | |
| 125 | |
| 126 function simplesave(o, buffer) | |
| 127 local t = type(o); | |
| 128 if t == "number" then | |
| 129 t_insert(buffer, tostring(o)); | |
| 130 elseif t == "string" then | |
| 131 stringsave(o, buffer); | |
| 132 elseif t == "table" then | |
| 133 tablesave(o, buffer); | |
| 134 elseif t == "boolean" then | |
| 135 t_insert(buffer, (o and "true" or "false")); | |
| 136 else | |
| 137 t_insert(buffer, "null"); | |
| 138 end | |
| 139 end | |
| 140 | |
| 141 function json.encode(obj) | |
| 142 local t = {}; | |
| 143 simplesave(obj, t); | |
| 144 return t_concat(t); | |
| 145 end | |
|
4474
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
|
146 function json.encode_ordered(obj) |
|
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
|
147 local t = { ordered = true }; |
|
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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148 simplesave(obj, t); |
|
b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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149 return t_concat(t); |
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b08a46cf06e6
util.json: Added function encode_ordered(object).
Waqas Hussain <waqas20@gmail.com>
parents:
4404
diff
changeset
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150 end |
|
5395
ec33d72a08b6
util.json: Add json.encode_array() (thanks B)
Matthew Wild <mwild1@gmail.com>
parents:
4474
diff
changeset
|
151 function json.encode_array(obj) |
|
ec33d72a08b6
util.json: Add json.encode_array() (thanks B)
Matthew Wild <mwild1@gmail.com>
parents:
4474
diff
changeset
|
152 local t = {}; |
|
ec33d72a08b6
util.json: Add json.encode_array() (thanks B)
Matthew Wild <mwild1@gmail.com>
parents:
4474
diff
changeset
|
153 arraysave(obj, t); |
|
ec33d72a08b6
util.json: Add json.encode_array() (thanks B)
Matthew Wild <mwild1@gmail.com>
parents:
4474
diff
changeset
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154 return t_concat(t); |
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ec33d72a08b6
util.json: Add json.encode_array() (thanks B)
Matthew Wild <mwild1@gmail.com>
parents:
4474
diff
changeset
|
155 end |
| 3979 | 156 |
| 157 ----------------------------------- | |
| 158 | |
| 159 | |
| 160 function json.decode(json) | |
|
4284
20979f124ad9
util.json: Fixed handling of truncated JSON.
Waqas Hussain <waqas20@gmail.com>
parents:
4147
diff
changeset
|
161 json = json.." "; -- appending a space ensures valid json wouldn't touch EOF |
| 3979 | 162 local pos = 1; |
| 163 local current = {}; | |
| 164 local stack = {}; | |
| 165 local ch, peek; | |
| 166 local function next() | |
| 167 ch = json:sub(pos, pos); | |
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4284
20979f124ad9
util.json: Fixed handling of truncated JSON.
Waqas Hussain <waqas20@gmail.com>
parents:
4147
diff
changeset
|
168 if ch == "" then error("Unexpected EOF"); end |
| 3979 | 169 pos = pos+1; |
| 170 peek = json:sub(pos, pos); | |
| 171 return ch; | |
| 172 end | |
| 173 | |
| 174 local function skipwhitespace() | |
| 175 while ch and (ch == "\r" or ch == "\n" or ch == "\t" or ch == " ") do | |
| 176 next(); | |
| 177 end | |
| 178 end | |
| 179 local function skiplinecomment() | |
| 180 repeat next(); until not(ch) or ch == "\r" or ch == "\n"; | |
| 181 skipwhitespace(); | |
| 182 end | |
| 183 local function skipstarcomment() | |
| 184 next(); next(); -- skip '/', '*' | |
| 185 while peek and ch ~= "*" and peek ~= "/" do next(); end | |
| 186 if not peek then error("eof in star comment") end | |
| 187 next(); next(); -- skip '*', '/' | |
| 188 skipwhitespace(); | |
| 189 end | |
| 190 local function skipstuff() | |
| 191 while true do | |
| 192 skipwhitespace(); | |
| 193 if ch == "/" and peek == "*" then | |
| 194 skipstarcomment(); | |
|
4404
5356664ef9d4
util.json: Fix for single-line comments (thanks Norbert Kiesel)
Matthew Wild <mwild1@gmail.com>
parents:
4284
diff
changeset
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195 elseif ch == "/" and peek == "/" then |
| 3979 | 196 skiplinecomment(); |
| 197 else | |
| 198 return; | |
| 199 end | |
| 200 end | |
| 201 end | |
| 202 | |
| 203 local readvalue; | |
| 204 local function readarray() | |
| 205 local t = {}; | |
| 206 next(); -- skip '[' | |
| 207 skipstuff(); | |
| 208 if ch == "]" then next(); return t; end | |
| 209 t_insert(t, readvalue()); | |
| 210 while true do | |
| 211 skipstuff(); | |
| 212 if ch == "]" then next(); return t; end | |
| 213 if not ch then error("eof while reading array"); | |
| 214 elseif ch == "," then next(); | |
| 215 elseif ch then error("unexpected character in array, comma expected"); end | |
| 216 if not ch then error("eof while reading array"); end | |
| 217 t_insert(t, readvalue()); | |
| 218 end | |
| 219 end | |
| 220 | |
| 221 local function checkandskip(c) | |
| 222 local x = ch or "eof"; | |
| 223 if x ~= c then error("unexpected "..x..", '"..c.."' expected"); end | |
| 224 next(); | |
| 225 end | |
| 226 local function readliteral(lit, val) | |
| 227 for c in lit:gmatch(".") do | |
| 228 checkandskip(c); | |
| 229 end | |
| 230 return val; | |
| 231 end | |
| 232 local function readstring() | |
| 233 local s = ""; | |
| 234 checkandskip("\""); | |
| 235 while ch do | |
| 236 while ch and ch ~= "\\" and ch ~= "\"" do | |
| 237 s = s..ch; next(); | |
| 238 end | |
| 239 if ch == "\\" then | |
| 240 next(); | |
| 241 if unescapes[ch] then | |
| 242 s = s..unescapes[ch]; | |
| 243 next(); | |
| 244 elseif ch == "u" then | |
| 245 local seq = ""; | |
| 246 for i=1,4 do | |
| 247 next(); | |
| 248 if not ch then error("unexpected eof in string"); end | |
| 249 if not ch:match("[0-9a-fA-F]") then error("invalid unicode escape sequence in string"); end | |
| 250 seq = seq..ch; | |
| 251 end | |
| 252 s = s..s.char(tonumber(seq, 16)); -- FIXME do proper utf-8 | |
| 253 next(); | |
| 254 else error("invalid escape sequence in string"); end | |
| 255 end | |
| 256 if ch == "\"" then | |
| 257 next(); | |
| 258 return s; | |
| 259 end | |
| 260 end | |
| 261 error("eof while reading string"); | |
| 262 end | |
| 263 local function readnumber() | |
| 264 local s = ""; | |
| 265 if ch == "-" then | |
| 266 s = s..ch; next(); | |
| 267 if not ch:match("[0-9]") then error("number format error"); end | |
| 268 end | |
| 269 if ch == "0" then | |
| 270 s = s..ch; next(); | |
| 271 if ch:match("[0-9]") then error("number format error"); end | |
| 272 else | |
| 273 while ch and ch:match("[0-9]") do | |
| 274 s = s..ch; next(); | |
| 275 end | |
| 276 end | |
| 277 if ch == "." then | |
| 278 s = s..ch; next(); | |
| 279 if not ch:match("[0-9]") then error("number format error"); end | |
| 280 while ch and ch:match("[0-9]") do | |
| 281 s = s..ch; next(); | |
| 282 end | |
| 283 if ch == "e" or ch == "E" then | |
| 284 s = s..ch; next(); | |
| 285 if ch == "+" or ch == "-" then | |
| 286 s = s..ch; next(); | |
| 287 if not ch:match("[0-9]") then error("number format error"); end | |
| 288 while ch and ch:match("[0-9]") do | |
| 289 s = s..ch; next(); | |
| 290 end | |
| 291 end | |
| 292 end | |
| 293 end | |
| 294 return tonumber(s); | |
| 295 end | |
| 296 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
|
297 skipstuff(); |
| 3979 | 298 local k = readstring(); |
|
4147
7f119ebcf55f
util.json: Fixed a parse error caused by unexpected whitespace.
Waqas Hussain <waqas20@gmail.com>
parents:
3979
diff
changeset
|
299 skipstuff(); |
| 3979 | 300 checkandskip(":"); |
| 301 t[k] = readvalue(); | |
| 302 end | |
| 303 local function fixobject(obj) | |
| 304 local __array = obj.__array; | |
| 305 if __array then | |
| 306 obj.__array = nil; | |
| 307 for i,v in ipairs(__array) do | |
| 308 t_insert(obj, v); | |
| 309 end | |
| 310 end | |
| 311 local __hash = obj.__hash; | |
| 312 if __hash then | |
| 313 obj.__hash = nil; | |
| 314 local k; | |
| 315 for i,v in ipairs(__hash) do | |
| 316 if k ~= nil then | |
| 317 obj[k] = v; k = nil; | |
| 318 else | |
| 319 k = v; | |
| 320 end | |
| 321 end | |
| 322 end | |
| 323 return obj; | |
| 324 end | |
| 325 local function readobject() | |
| 326 local t = {}; | |
| 327 next(); -- skip '{' | |
| 328 skipstuff(); | |
| 329 if ch == "}" then next(); return t; end | |
| 330 if not ch then error("eof while reading object"); end | |
| 331 readmember(t); | |
| 332 while true do | |
| 333 skipstuff(); | |
| 334 if ch == "}" then next(); return fixobject(t); end | |
| 335 if not ch then error("eof while reading object"); | |
| 336 elseif ch == "," then next(); | |
| 337 elseif ch then error("unexpected character in object, comma expected"); end | |
| 338 if not ch then error("eof while reading object"); end | |
| 339 readmember(t); | |
| 340 end | |
| 341 end | |
| 342 | |
| 343 function readvalue() | |
| 344 skipstuff(); | |
| 345 while ch do | |
| 346 if ch == "{" then | |
| 347 return readobject(); | |
| 348 elseif ch == "[" then | |
| 349 return readarray(); | |
| 350 elseif ch == "\"" then | |
| 351 return readstring(); | |
| 352 elseif ch:match("[%-0-9%.]") then | |
| 353 return readnumber(); | |
| 354 elseif ch == "n" then | |
| 355 return readliteral("null", null); | |
| 356 elseif ch == "t" then | |
| 357 return readliteral("true", true); | |
| 358 elseif ch == "f" then | |
| 359 return readliteral("false", false); | |
| 360 else | |
| 361 error("invalid character at value start: "..ch); | |
| 362 end | |
| 363 end | |
| 364 error("eof while reading value"); | |
| 365 end | |
| 366 next(); | |
| 367 return readvalue(); | |
| 368 end | |
| 369 | |
| 370 function json.test(object) | |
| 371 local encoded = json.encode(object); | |
| 372 local decoded = json.decode(encoded); | |
| 373 local recoded = json.encode(decoded); | |
| 374 if encoded ~= recoded then | |
| 375 print("FAILED"); | |
| 376 print("encoded:", encoded); | |
| 377 print("recoded:", recoded); | |
| 378 else | |
| 379 print(encoded); | |
| 380 end | |
| 381 return encoded == recoded; | |
| 382 end | |
| 383 | |
| 384 return json; |
