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  138. <h1>Object Instance <code>luci.jsonc.parser</code></h1>
  139. <p>
  140. LuCI JSON parser instance.
  141. A JSON parser instance is useful to parse JSON data chunk by chunk, without
  142. the need to assemble all data in advance.</p>
  143. <h2>Functions</h2>
  144. <table class="function_list">
  145. <tr>
  146. <td class="name" nowrap><a href="#parser.parse">parser:parse</a>&nbsp;(json)</td>
  147. <td class="summary">
  148. Parses one chunk of JSON data.</td>
  149. </tr>
  150. <tr>
  151. <td class="name" nowrap><a href="#parser.get">parser:get</a>&nbsp;()</td>
  152. <td class="summary">
  153. Convert parsed JSON data into Lua table.</td>
  154. </tr>
  155. <tr>
  156. <td class="name" nowrap><a href="#parser.set">parser:set</a>&nbsp;(data)</td>
  157. <td class="summary">
  158. Put Lua data into the parser.</td>
  159. </tr>
  160. <tr>
  161. <td class="name" nowrap><a href="#parser.sink">parser:sink</a>&nbsp;()</td>
  162. <td class="summary">
  163. Generate an ltn12-compatible sink.</td>
  164. </tr>
  165. <tr>
  166. <td class="name" nowrap><a href="#parser.stringify">parser:stringify</a>&nbsp;(pretty)</td>
  167. <td class="summary">
  168. Serialize current parser state as JSON.</td>
  169. </tr>
  170. </table>
  171. <br/>
  172. <br/>
  173. <h2><a name="functions"></a>Functions</h2>
  174. <dl class="function">
  175. <dt><a name="parser.parse"></a><strong>parser:parse</strong>&nbsp;(json)</dt>
  176. <dd>
  177. Parses one chunk of JSON data.
  178. <h3>Parameters</h3>
  179. <ul>
  180. <li>
  181. json: String containing the JSON fragment to parse
  182. </li>
  183. </ul>
  184. <h3>Usage:</h3>
  185. <pre>parser = luci.jsonc.new()
  186. while true do
  187. chunk = ... -- fetch a cunk of data, e.g. from a socket
  188. finish, errmsg = <b>parser.parse(chunk)</b>
  189. if finish == nil then
  190. error("Cannot parse JSON: " .. errmsg)
  191. end
  192. if finish == true then
  193. break
  194. end
  195. end</pre>
  196. <h3>Return value:</h3>
  197. <ul>
  198. <li><code>true</code> if a complete JSON object has been parsed and no further input is
  199. expected.</li>
  200. <li><code>false</code> if further input is required</li>
  201. <li><code>nil</code> if an error was encountered while parsing the current chunk.
  202. In this case a string describing the parse error is returned as second
  203. value.</li></ul>
  204. <h3>See also:</h3>
  205. <ul>
  206. <li><a href="#parser.get">
  207. parser:get
  208. </a>
  209. </ul>
  210. </dd>
  211. <dt><a name="parser.get"></a><strong>parser:get</strong>&nbsp;()</dt>
  212. <dd>
  213. Convert parsed JSON data into Lua table.
  214. <h3>Usage:</h3>
  215. <pre>parser = luci.jsonc.new()
  216. parser:parse('{ "example": "test" }')
  217. data = parser:get()
  218. print(data.example) -- "test"</pre>
  219. <h3>Return value:</h3>
  220. Parsed JSON object converted into a Lua table or <code>nil</code> if the parser
  221. didn't finish or encountered an error.
  222. <h3>See also:</h3>
  223. <ul>
  224. <li><a href="#parser.parse">
  225. parser:parse
  226. </a>
  227. </ul>
  228. </dd>
  229. <dt><a name="parser.set"></a><strong>parser:set</strong>&nbsp;(data)</dt>
  230. <dd>
  231. Put Lua data into the parser.
  232. <h3>Parameters</h3>
  233. <ul>
  234. <li>
  235. data: Lua data to put into the parser object. The data is converted to an
  236. internal JSON representation that can be dumped with <code>stringify()</code>.
  237. The conversion follows the rules described in <code>luci.jsonc.stringify</code>.
  238. </li>
  239. </ul>
  240. <h3>Usage:</h3>
  241. <pre>parser = luci.jsonc.new()
  242. parser:set({ "some", "data" })</pre>
  243. <h3>Return value:</h3>
  244. Nothing is returned.
  245. <h3>See also:</h3>
  246. <ul>
  247. <li><a href="#parser.stringify">
  248. parser:stringify
  249. </a>
  250. </ul>
  251. </dd>
  252. <dt><a name="parser.sink"></a><strong>parser:sink</strong>&nbsp;()</dt>
  253. <dd>
  254. Generate an ltn12-compatible sink.
  255. <h3>Usage:</h3>
  256. <pre>parser = luci.jsonc.new()
  257. ltn12.pump.all(ltn12.source.file(io.input()), parser:sink())
  258. print(parser:get())</pre>
  259. <h3>Return value:</h3>
  260. Returns a function that can be used as an ltn12 sink.
  261. </dd>
  262. <dt><a name="parser.stringify"></a><strong>parser:stringify</strong>&nbsp;(pretty)</dt>
  263. <dd>
  264. Serialize current parser state as JSON.
  265. <h3>Parameters</h3>
  266. <ul>
  267. <li>
  268. pretty: A boolean value indicating whether the resulting JSON should be pretty printed.
  269. </li>
  270. </ul>
  271. <h3>Usage:</h3>
  272. <pre>parser = luci.jsonc.new()
  273. parser:parse('{ "example": "test" }')
  274. print(parser:serialize()) -- '{"example":"test"}'</pre>
  275. <h3>Return value:</h3>
  276. Returns the serialized JSON data of this parser instance.
  277. </dd>
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