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<a name="JsonPath"></a><div class="titlepage"></div>
<div class="refnamediv"><table width="100%"><tr>
<td valign="top">
<h2><span class="refentrytitle"><a name="JsonPath.top_of_page"></a>JsonPath</span></h2>
<p>JsonPath — JSONPath implementation</p>
</td>
<td valign="top" align="right"></td>
</tr></table></div>
<div class="refsynopsisdiv">
<a name="JsonPath.synopsis"></a><h2>Synopsis</h2>
<pre class="synopsis"> <a class="link" href="JsonPath.html#JsonPath-struct" title="JsonPath">JsonPath</a>;
<a class="link" href="JsonPath.html#JsonPathClass" title="JsonPathClass">JsonPathClass</a>;
<a class="link" href="JsonPath.html" title="JsonPath"><span class="returnvalue">JsonPath</span></a> * <a class="link" href="JsonPath.html#json-path-new" title="json_path_new ()">json_path_new</a> (<em class="parameter"><code><span class="type">void</span></code></em>);
#define <a class="link" href="JsonPath.html#JSON-PATH-ERROR:CAPS" title="JSON_PATH_ERROR">JSON_PATH_ERROR</a>
enum <a class="link" href="JsonPath.html#JsonPathError" title="enum JsonPathError">JsonPathError</a>;
<span class="returnvalue">gboolean</span> <a class="link" href="JsonPath.html#json-path-compile" title="json_path_compile ()">json_path_compile</a> (<em class="parameter"><code><a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> *path</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *expression</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);
<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="returnvalue">JsonNode</span></a> * <a class="link" href="JsonPath.html#json-path-match" title="json_path_match ()">json_path_match</a> (<em class="parameter"><code><a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> *path</code></em>,
<em class="parameter"><code><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> *root</code></em>);
<a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="returnvalue">JsonNode</span></a> * <a class="link" href="JsonPath.html#json-path-query" title="json_path_query ()">json_path_query</a> (<em class="parameter"><code>const <span class="type">char</span> *expression</code></em>,
<em class="parameter"><code><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> *root</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);
</pre>
</div>
<div class="refsect1">
<a name="JsonPath.object-hierarchy"></a><h2>Object Hierarchy</h2>
<pre class="synopsis">
GObject
+----JsonPath
</pre>
</div>
<div class="refsect1">
<a name="JsonPath.description"></a><h2>Description</h2>
<p>
<a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> is a simple class implementing the JSONPath syntax for extracting
data out of a JSON tree. While the semantics of the JSONPath expressions are
heavily borrowed by the XPath specification for XML, the syntax follows the
ECMAScript origins of JSON.
</p>
<p>
Once a <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> instance has been created, it has to compile a JSONPath
expression using <a class="link" href="JsonPath.html#json-path-compile" title="json_path_compile ()"><code class="function">json_path_compile()</code></a> before being able to match it to a
JSON tree; the same <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> instance can be used to match multiple JSON
trees. It it also possible to compile a new JSONPath expression using the
same <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> instance; the previous expression will be discarded only if
the compilation of the new expression is successful.
</p>
<p>
The simple convenience function <a class="link" href="JsonPath.html#json-path-query" title="json_path_query ()"><code class="function">json_path_query()</code></a> can be used for one-off
matching.
</p>
<p>
</p>
<div class="refsect2">
<a name="json-path-syntax"></a><h3>Syntax of the JSONPath expressions</h3>
<p>A JSONPath expression is composed by path indices and operators.
Each path index can either be a member name or an element index inside
a JSON tree. A JSONPath expression must start with the '$' operator; each
path index is separated using either the dot notation or the bracket
notation, e.g.:</p>
<div class="informalexample"><pre class="programlisting">
/* dot notation */
$.store.book[0].title
/* bracket notation */
$['store']['book'][0]['title']
</pre></div>
<p>The available operators are:</p>
<div class="table">
<a name="json-path-operators"></a><p class="title"><b>Table 1. Operators</b></p>
<div class="table-contents"><table summary="Operators" border="1">
<colgroup>
<col>
<col>
<col>
<col>
</colgroup>
<thead><tr>
<th>Operator</th>
<th>Description</th>
<th>Example</th>
<th>Results</th>
</tr></thead>
<tbody>
<tr>
<td>$</td>
<td>The root node</td>
<td>$</td>
<td>The whole document</td>
</tr>
<tr>
<td>. or []</td>
<td>The child member or element</td>
<td>$.store.book</td>
<td>The contents of the book member of the store object</td>
</tr>
<tr>
<td>..</td>
<td>Recursive descent</td>
<td>$..author</td>
<td>The content of the author member in every object</td>
</tr>
<tr>
<td>*</td>
<td>Wildcard</td>
<td>$.store.book[*].author</td>
<td>The content of the author member of any object of the
array contained in the book member of the store object</td>
</tr>
<tr>
<td>[]</td>
<td>Subscript</td>
<td>$.store.book[0]</td>
<td>The first element of the array contained in the book
member of the store object</td>
</tr>
<tr>
<td>[,]</td>
<td>Set</td>
<td>$.store.book[0,1]</td>
<td>The first two elements of the array contained in the
book member of the store object</td>
</tr>
<tr>
<td>[start:end:step]</td>
<td>Slice</td>
<td>$.store.book[:2]</td>
<td>The first two elements of the array contained in the
book member of the store object; the start and step are omitted
and implied to be 0 and 1, respectively</td>
</tr>
</tbody>
</table></div>
</div>
<br class="table-break"><p>More information about JSONPath is available on Stefan Gössner's
<a class="ulink" href="http://goessner.net/articles/JsonPath/" target="_top">website</a>.</p>
</div>
<p>
</p>
<p>
</p>
<div class="example">
<a name="json-path-example"></a><p class="title"><b>Example 1. Example of JsonPath usage</b></p>
<div class="example-contents">
<p>The following example shows some of the results of using <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a>
on a JSON tree. We use the following JSON description of a
bookstore:</p>
<pre class="programlisting">
{ "store": {
"book": [
{ "category": "reference",
"author": "Nigel Rees",
"title": "Sayings of the Century",
"price": "8.95"
},
{ "category": "fiction",
"author": "Evelyn Waugh",
"title": "Sword of Honour",
"price": "12.99"
},
{ "category": "fiction",
"author": "Herman Melville",
"title": "Moby Dick",
"isbn": "0-553-21311-3",
"price": "8.99"
},
{ "category": "fiction",
"author": "J. R. R. Tolkien",
"title": "The Lord of the Rings",
"isbn": "0-395-19395-8",
"price": "22.99"
}
],
"bicycle": {
"color": "red",
"price": "19.95"
}
}
}
</pre>
<p>We can parse the JSON using <a class="link" href="JsonParser.html" title="JsonParser"><span class="type">JsonParser</span></a>:</p>
<pre class="programlisting">
JsonParser *parser = json_parser_new ();
json_parser_load_from_data (parser, json_data, -1, NULL);
</pre>
<p>If we run the following code:</p>
<pre class="programlisting">
JsonNode *result;
JsonPath *path = json_path_new ();
json_path_compile (path, "$.store..author", NULL);
result = json_path_match (path, json_parser_get_root (parser));
</pre>
<p>The <span class="emphasis"><em>result</em></span> <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> will contain an array
with all values of the <span class="emphasis"><em>author</em></span> member of the objects
in the JSON tree. If we use a <a class="link" href="JsonGenerator.html" title="JsonGenerator"><span class="type">JsonGenerator</span></a> to convert the <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>
to a string and print it:</p>
<pre class="programlisting">
JsonGenerator *generator = json_generator_new ();
char *str;
json_generator_set_pretty (generator, TRUE);
json_generator_set_root (generator, result);
str = json_generator_to_data (generator, NULL);
g_print ("Results: %s\n", str);
</pre>
<p>The output will be:</p>
<pre class="programlisting">
[
"Nigel Rees",
"Evelyn Waugh",
"Herman Melville",
"J. R. R. Tolkien"
]
</pre>
</div>
</div>
<p><br class="example-break">
</p>
<p>
<a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> is available since JSON-GLib 0.14
</p>
</div>
<div class="refsect1">
<a name="JsonPath.details"></a><h2>Details</h2>
<div class="refsect2">
<a name="JsonPath-struct"></a><h3>JsonPath</h3>
<pre class="programlisting">typedef struct _JsonPath JsonPath;</pre>
<p>
The <span class="structname">JsonPath</span> structure is an opaque object
whose members cannot be directly accessed except through the provided
API.
</p>
<p class="since">Since 0.14</p>
</div>
<hr>
<div class="refsect2">
<a name="JsonPathClass"></a><h3>JsonPathClass</h3>
<pre class="programlisting">typedef struct _JsonPathClass JsonPathClass;</pre>
<p>
The <span class="structname">JsonPathClass</span> structure is an opaque
object class whose members cannot be directly accessed.
</p>
<p class="since">Since 0.14</p>
</div>
<hr>
<div class="refsect2">
<a name="json-path-new"></a><h3>json_path_new ()</h3>
<pre class="programlisting"><a class="link" href="JsonPath.html" title="JsonPath"><span class="returnvalue">JsonPath</span></a> * json_path_new (<em class="parameter"><code><span class="type">void</span></code></em>);</pre>
<p>
Creates a new <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> instance.
</p>
<p>
Once created, the <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> object should be used with <a class="link" href="JsonPath.html#json-path-compile" title="json_path_compile ()"><code class="function">json_path_compile()</code></a>
and <a class="link" href="JsonPath.html#json-path-match" title="json_path_match ()"><code class="function">json_path_match()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>the newly created <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> instance. Use
<code class="function">g_object_unref()</code> to free the allocated resources when done. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.14</p>
</div>
<hr>
<div class="refsect2">
<a name="JSON-PATH-ERROR:CAPS"></a><h3>JSON_PATH_ERROR</h3>
<pre class="programlisting">#define JSON_PATH_ERROR (json_path_error_quark ())
</pre>
<p>
Error domain for <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> errors
</p>
<p class="since">Since 0.14</p>
</div>
<hr>
<div class="refsect2">
<a name="JsonPathError"></a><h3>enum JsonPathError</h3>
<pre class="programlisting">typedef enum {
JSON_PATH_ERROR_INVALID_QUERY
} JsonPathError;
</pre>
<p>
Error code enumeration for the <a class="link" href="JsonPath.html#JSON-PATH-ERROR:CAPS" title="JSON_PATH_ERROR"><code class="literal">JSON_PATH_ERROR</code></a> domain.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody><tr>
<td><p><a name="JSON-PATH-ERROR-INVALID-QUERY:CAPS"></a><span class="term"><code class="literal">JSON_PATH_ERROR_INVALID_QUERY</code></span></p></td>
<td>Invalid query
</td>
</tr></tbody>
</table></div>
<p class="since">Since 0.14</p>
</div>
<hr>
<div class="refsect2">
<a name="json-path-compile"></a><h3>json_path_compile ()</h3>
<pre class="programlisting"><span class="returnvalue">gboolean</span> json_path_compile (<em class="parameter"><code><a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> *path</code></em>,
<em class="parameter"><code>const <span class="type">char</span> *expression</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>
Validates and decomposes <em class="parameter"><code>expression</code></em>.
</p>
<p>
A JSONPath expression must be compiled before calling <a class="link" href="JsonPath.html#json-path-match" title="json_path_match ()"><code class="function">json_path_match()</code></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>path</code></em> :</span></p></td>
<td>a <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>expression</code></em> :</span></p></td>
<td>a JSONPath expression</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>return location for a <span class="type">GError</span>, or <code class="literal">NULL</code>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>
<code class="literal">TRUE</code> on success; on error, <em class="parameter"><code>error</code></em> will be set with
the <a class="link" href="JsonPath.html#JSON-PATH-ERROR:CAPS" title="JSON_PATH_ERROR"><code class="literal">JSON_PATH_ERROR</code></a> domain and a code from the <a class="link" href="JsonPath.html#JsonPathError" title="enum JsonPathError"><span class="type">JsonPathError</span></a>
enumeration, and <code class="literal">FALSE</code> will be returned</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.14</p>
</div>
<hr>
<div class="refsect2">
<a name="json-path-match"></a><h3>json_path_match ()</h3>
<pre class="programlisting"><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="returnvalue">JsonNode</span></a> * json_path_match (<em class="parameter"><code><a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> *path</code></em>,
<em class="parameter"><code><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> *root</code></em>);</pre>
<p>
Matches the JSON tree pointed by <em class="parameter"><code>root</code></em> using the expression compiled
into the <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a>.
</p>
<p>
The matching <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>s will be copied into a <a class="link" href="json-glib-JSON-Array.html#JsonArray" title="JsonArray"><span class="type">JsonArray</span></a> and
returned wrapped in a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>path</code></em> :</span></p></td>
<td>a compiled <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>root</code></em> :</span></p></td>
<td>a <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly-created <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> of type
<a class="link" href="json-glib-JSON-Node.html#JSON-NODE-ARRAY:CAPS"><code class="literal">JSON_NODE_ARRAY</code></a> containing an array of matching <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>s.
Use <a class="link" href="json-glib-JSON-Node.html#json-node-free" title="json_node_free ()"><code class="function">json_node_free()</code></a> when done. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
</td>
</tr>
</tbody>
</table></div>
<p class="since">Since 0.14</p>
</div>
<hr>
<div class="refsect2">
<a name="json-path-query"></a><h3>json_path_query ()</h3>
<pre class="programlisting"><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="returnvalue">JsonNode</span></a> * json_path_query (<em class="parameter"><code>const <span class="type">char</span> *expression</code></em>,
<em class="parameter"><code><a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> *root</code></em>,
<em class="parameter"><code><span class="type">GError</span> **error</code></em>);</pre>
<p>
Queries a JSON tree using a JSONPath expression.
</p>
<p>
This function is a simple wrapper around <a class="link" href="JsonPath.html#json-path-new" title="json_path_new ()"><code class="function">json_path_new()</code></a>,
<a class="link" href="JsonPath.html#json-path-compile" title="json_path_compile ()"><code class="function">json_path_compile()</code></a> and <a class="link" href="JsonPath.html#json-path-match" title="json_path_match ()"><code class="function">json_path_match()</code></a>. It implicitly
creates a <a class="link" href="JsonPath.html" title="JsonPath"><span class="type">JsonPath</span></a> instance, compiles <em class="parameter"><code>expression</code></em> and
matches it against the JSON tree pointed by <em class="parameter"><code>root</code></em>.
</p>
<div class="variablelist"><table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><p><span class="term"><em class="parameter"><code>expression</code></em> :</span></p></td>
<td>a JSONPath expression</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>root</code></em> :</span></p></td>
<td>the root of a JSON tree</td>
</tr>
<tr>
<td><p><span class="term"><em class="parameter"><code>error</code></em> :</span></p></td>
<td>return location for a <span class="type">GError</span>, or <code class="literal">NULL</code>
</td>
</tr>
<tr>
<td><p><span class="term"><span class="emphasis"><em>Returns</em></span> :</span></p></td>
<td>a newly-created <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a> of type
<a class="link" href="json-glib-JSON-Node.html#JSON-NODE-ARRAY:CAPS"><code class="literal">JSON_NODE_ARRAY</code></a> containing an array of matching <a class="link" href="json-glib-JSON-Node.html#JsonNode" title="JsonNode"><span class="type">JsonNode</span></a>s.
Use <a class="link" href="json-glib-JSON-Node.html#json-node-free" title="json_node_free ()"><code class="function">json_node_free()</code></a> when done. <span class="annotation">[<acronym title="Free data after the code is done."><span class="acronym">transfer full</span></acronym>]</span>
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<p class="since">Since 0.14</p>
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