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 194
 195 <h1>Object Instance <code>luci.jsonc.parser</code></h1>
 196
 197 <p>
 198  LuCI JSON parser instance.
 199  A JSON parser instance is useful to parse JSON data chunk by chunk, without
 200  the need to assemble all data in advance.</p>
 201
 202
 203
 204
 205
 206
 207
 208 <h2>Functions</h2>
 209 <table class="function_list">
 210
 211         <tr>
 212         <td class="name" nowrap><a href="#parser.parse">parser:parse</a>&nbsp;(json)</td>
 213         <td class="summary">
 214
 215 Parses one chunk of JSON data.</td>
 216         </tr>
 217
 218         <tr>
 219         <td class="name" nowrap><a href="#parser.get">parser:get</a>&nbsp;()</td>
 220         <td class="summary">
 221
 222 Convert parsed JSON data into Lua table.</td>
 223         </tr>
 224
 225         <tr>
 226         <td class="name" nowrap><a href="#parser.set">parser:set</a>&nbsp;(data)</td>
 227         <td class="summary">
 228
 229 Put Lua data into the parser.</td>
 230         </tr>
 231
 232         <tr>
 233         <td class="name" nowrap><a href="#parser.sink">parser:sink</a>&nbsp;()</td>
 234         <td class="summary">
 235
 236 Generate an ltn12-compatible sink.</td>
 237         </tr>
 238
 239         <tr>
 240         <td class="name" nowrap><a href="#parser.stringify">parser:stringify</a>&nbsp;(pretty)</td>
 241         <td class="summary">
 242
 243 Serialize current parser state as JSON.</td>
 244         </tr>
 245
 246 </table>
 247
 248
 249
 250
 251
 252
 253 <br/>
 254 <br/>
 255
 256
 257 <h2><a name="functions"></a>Functions</h2>
 258 <dl class="function">
 259
 260
 261
 262 <dt><a name="parser.parse"></a><strong>parser:parse</strong>&nbsp;(json)</dt>
 263 <dd>
 264
 265
 266 Parses one chunk of JSON data.
 267
 268
 269
 270 <h3>Parameters</h3>
 271 <ul>
 272
 273         <li>
 274           json: String containing the JSON fragment to parse
 275         </li>
 276
 277 </ul>
 278
 279
 280
 281
 282 <h3>Usage:</h3>
 283 <pre>parser = luci.jsonc.new()
 284
 285 while true do
 286         chunk = ...  -- fetch a cunk of data, e.g. from a socket
 287         finish, errmsg = <b>parser.parse(chunk)</b>
 288
 289         if finish == nil then
 290                 error("Cannot parse JSON: " .. errmsg)
 291         end
 292
 293         if finish == true then
 294                 break
 295         end
 296 end</pre>
 297
 298
 299
 300 <h3>Return value:</h3>
 301 <ul>
 302         <li><code>true</code> if a complete JSON object has been parsed and no further input is
 303             expected.</li>
 304         <li><code>false</code> if further input is required</li>
 305         <li><code>nil</code> if an error was encountered while parsing the current chunk.
 306             In this case a string describing the parse error is returned as second
 307             value.</li></ul>
 308
 309
 310
 311 <h3>See also:</h3>
 312 <ul>
 313
 314         <li><a href="#parser.get">
 315                 parser:get
 316         </a>
 317
 318 </ul>
 319
 320 </dd>
 321
 322
 323
 324
 325 <dt><a name="parser.get"></a><strong>parser:get</strong>&nbsp;()</dt>
 326 <dd>
 327
 328
 329 Convert parsed JSON data into Lua table.
 330
 331
 332
 333
 334
 335
 336 <h3>Usage:</h3>
 337 <pre>parser = luci.jsonc.new()
 338 parser:parse('{ "example": "test" }')
 339
 340 data = parser:get()
 341 print(data.example)  -- "test"</pre>
 342
 343
 344
 345 <h3>Return value:</h3>
 346 Parsed JSON object converted into a Lua table or <code>nil</code> if the parser
 347         didn't finish or encountered an error.
 348
 349
 350
 351 <h3>See also:</h3>
 352 <ul>
 353
 354         <li><a href="#parser.parse">
 355                 parser:parse
 356         </a>
 357
 358 </ul>
 359
 360 </dd>
 361
 362
 363
 364
 365 <dt><a name="parser.set"></a><strong>parser:set</strong>&nbsp;(data)</dt>
 366 <dd>
 367
 368
 369 Put Lua data into the parser.
 370
 371
 372
 373 <h3>Parameters</h3>
 374 <ul>
 375
 376         <li>
 377           data: Lua data to put into the parser object. The data is converted to an
 378         internal JSON representation that can be dumped with <code>stringify()</code>.
 379         The conversion follows the rules described in <code>luci.jsonc.stringify</code>.
 380         </li>
 381
 382 </ul>
 383
 384
 385
 386
 387 <h3>Usage:</h3>
 388 <pre>parser = luci.jsonc.new()
 389 parser:set({ "some", "data" })</pre>
 390
 391
 392
 393 <h3>Return value:</h3>
 394 Nothing is returned.
 395
 396
 397
 398 <h3>See also:</h3>
 399 <ul>
 400
 401         <li><a href="#parser.stringify">
 402                 parser:stringify
 403         </a>
 404
 405 </ul>
 406
 407 </dd>
 408
 409
 410
 411
 412 <dt><a name="parser.sink"></a><strong>parser:sink</strong>&nbsp;()</dt>
 413 <dd>
 414
 415
 416 Generate an ltn12-compatible sink.
 417
 418
 419
 420
 421
 422
 423 <h3>Usage:</h3>
 424 <pre>parser = luci.jsonc.new()
 425 ltn12.pump.all(ltn12.source.file(io.input()), parser:sink())
 426 print(parser:get())</pre>
 427
 428
 429
 430 <h3>Return value:</h3>
 431 Returns a function that can be used as an ltn12 sink.
 432
 433
 434
 435 </dd>
 436
 437
 438
 439
 440 <dt><a name="parser.stringify"></a><strong>parser:stringify</strong>&nbsp;(pretty)</dt>
 441 <dd>
 442
 443
 444 Serialize current parser state as JSON.
 445
 446
 447
 448 <h3>Parameters</h3>
 449 <ul>
 450
 451         <li>
 452           pretty: A boolean value indicating whether the resulting JSON should be pretty printed.
 453         </li>
 454
 455 </ul>
 456
 457
 458
 459
 460 <h3>Usage:</h3>
 461 <pre>parser = luci.jsonc.new()
 462 parser:parse('{ "example": "test" }')
 463 print(parser:serialize())  -- '{"example":"test"}'</pre>
 464
 465
 466
 467 <h3>Return value:</h3>
 468 Returns the serialized JSON data of this parser instance.
 469
 470
 471
 472 </dd>
 473
 474
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