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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN"
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<head>
<title>Reference</title>
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<h1>LuaDoc</h1>
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<h1>Object Instance <code>luci.jsonc.parser</code></h1>
<p>
LuCI JSON parser instance.
A JSON parser instance is useful to parse JSON data chunk by chunk, without
the need to assemble all data in advance.</p>
<h2>Functions</h2>
<table class="function_list">
<tr>
<td class="name" nowrap><a href="#parser.parse">parser:parse</a> (json)</td>
<td class="summary">
Parses one chunk of JSON data.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#parser.get">parser:get</a> ()</td>
<td class="summary">
Convert parsed JSON data into Lua table.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#parser.set">parser:set</a> (data)</td>
<td class="summary">
Put Lua data into the parser.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#parser.sink">parser:sink</a> ()</td>
<td class="summary">
Generate an ltn12-compatible sink.</td>
</tr>
<tr>
<td class="name" nowrap><a href="#parser.stringify">parser:stringify</a> (pretty)</td>
<td class="summary">
Serialize current parser state as JSON.</td>
</tr>
</table>
<br/>
<br/>
<h2><a name="functions"></a>Functions</h2>
<dl class="function">
<dt><a name="parser.parse"></a><strong>parser:parse</strong> (json)</dt>
<dd>
Parses one chunk of JSON data.
<h3>Parameters</h3>
<ul>
<li>
json: String containing the JSON fragment to parse
</li>
</ul>
<h3>Usage:</h3>
<pre>parser = luci.jsonc.new()
while true do
chunk = ... -- fetch a cunk of data, e.g. from a socket
finish, errmsg = <b>parser.parse(chunk)</b>
if finish == nil then
error("Cannot parse JSON: " .. errmsg)
end
if finish == true then
break
end
end</pre>
<h3>Return value:</h3>
<ul>
<li><code>true</code> if a complete JSON object has been parsed and no further input is
expected.</li>
<li><code>false</code> if further input is required</li>
<li><code>nil</code> if an error was encountered while parsing the current chunk.
In this case a string describing the parse error is returned as second
value.</li></ul>
<h3>See also:</h3>
<ul>
<li><a href="#parser.get">
parser:get
</a>
</ul>
</dd>
<dt><a name="parser.get"></a><strong>parser:get</strong> ()</dt>
<dd>
Convert parsed JSON data into Lua table.
<h3>Usage:</h3>
<pre>parser = luci.jsonc.new()
parser:parse('{ "example": "test" }')
data = parser:get()
print(data.example) -- "test"</pre>
<h3>Return value:</h3>
Parsed JSON object converted into a Lua table or <code>nil</code> if the parser
didn't finish or encountered an error.
<h3>See also:</h3>
<ul>
<li><a href="#parser.parse">
parser:parse
</a>
</ul>
</dd>
<dt><a name="parser.set"></a><strong>parser:set</strong> (data)</dt>
<dd>
Put Lua data into the parser.
<h3>Parameters</h3>
<ul>
<li>
data: Lua data to put into the parser object. The data is converted to an
internal JSON representation that can be dumped with <code>stringify()</code>.
The conversion follows the rules described in <code>luci.jsonc.stringify</code>.
</li>
</ul>
<h3>Usage:</h3>
<pre>parser = luci.jsonc.new()
parser:set({ "some", "data" })</pre>
<h3>Return value:</h3>
Nothing is returned.
<h3>See also:</h3>
<ul>
<li><a href="#parser.stringify">
parser:stringify
</a>
</ul>
</dd>
<dt><a name="parser.sink"></a><strong>parser:sink</strong> ()</dt>
<dd>
Generate an ltn12-compatible sink.
<h3>Usage:</h3>
<pre>parser = luci.jsonc.new()
ltn12.pump.all(ltn12.source.file(io.input()), parser:sink())
print(parser:get())</pre>
<h3>Return value:</h3>
Returns a function that can be used as an ltn12 sink.
</dd>
<dt><a name="parser.stringify"></a><strong>parser:stringify</strong> (pretty)</dt>
<dd>
Serialize current parser state as JSON.
<h3>Parameters</h3>
<ul>
<li>
pretty: A boolean value indicating whether the resulting JSON should be pretty printed.
</li>
</ul>
<h3>Usage:</h3>
<pre>parser = luci.jsonc.new()
parser:parse('{ "example": "test" }')
print(parser:serialize()) -- '{"example":"test"}'</pre>
<h3>Return value:</h3>
Returns the serialized JSON data of this parser instance.
</dd>
</dl>
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