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<div class="titlepage"><div><div><h2 class="title">
<a name="tutorial-querying-functionality"></a>Listing built-in functionality</h2></div></div></div>
<p>
Raptor can be configured and compiled with support for different
parsers and serializers. Lists of the functionality built into the
library can be interrogated by means of
<span class="emphasis"><em>enumerate</em></span> functions. These take as input an
<code class="literal">int</code> counter and return descriptions of the feature
at that offset in the list. The descriptions are returned stored in
the variables pointed to by the reference arguments of the
<code class="literal">**</code><span class="emphasis"><em>var</em></span> form.
The return value of the function is non-zero when the counter has
gone too far.
</p>
<div class="variablelist">
<p class="title"><b>Listing Functionality with Enumeration</b></p>
<table border="0">
<col align="left" valign="top">
<tbody>
<tr>
<td><span class="term">List the parse syntaxes (parser names)</span></td>
<td><pre class="programlisting">
int
raptor_parsers_enumerate(const unsigned int counter,
const char **name, const char **label);
</pre></td>
</tr>
<tr>
<td><span class="term">List the parse syntaxes
(same as above but with more information)</span></td>
<td><pre class="programlisting">
int
raptor_syntaxes_enumerate(const unsigned int counter,
const char **name,
const char **label,
const char **mime_type,
const unsigned char **uri_string);
</pre></td>
</tr>
<tr>
<td><span class="term">List the serializer syntaxes (serializer names)</span></td>
<td><pre class="programlisting">
int
raptor_serializers_enumerate(const unsigned int counter,
const char **name,
const char **label,
const char **mime_type,
const unsigned char **uri_string);
</pre></td>
</tr>
<tr>
<td><span class="term">List the Parser features</span></td>
<td><pre class="programlisting">
int
raptor_features_enumerate(const raptor_feature feature,
const char **name, raptor_uri **uri,
const char **label);
</pre></td>
</tr>
<tr>
<td><span class="term">List the Serializer features</span></td>
<td><pre class="programlisting">
int
raptor_serializer_features_enumerate(const raptor_feature feature,
const char **name,
raptor_uri **uri,
const char **label);
</pre></td>
</tr>
<tr>
<td><span class="term">List the XML Writer features</span></td>
<td><pre class="programlisting">
int
raptor_xml_writer_features_enumerate(const raptor_feature feature,
const char **name,
raptor_uri **uri,
const char **label);
</pre></td>
</tr>
</tbody>
</table>
</div>
<p>These functions can be called directly after
<a href="raptor-section-general.html#raptor-init"><code class="function">raptor_init()</code></a>
has been called so can be used to find name parameters for creating
parser and serializer instances. This is one way to find a parser
(name) by it's MIME Type, the other is to use the mime_type parameter
of the
<a href="raptor-section-parser.html#raptor-new-parser-for-content"><code class="function">raptor_new_parser_for_content()</code></a>.</p>
<div class="example">
<a name="raptor-example-list-all-parser-features"></a><p class="title"><b>Example 1. List all features of parsers with an enumerate function</b></p>
<div class="example-contents">
<pre class="programlisting">
int i;
for(i=0; i < RAPTOR_FEATURE_LAST; i++) {
const char *name;
raptor_uri *uri;
const char *label;
if(raptor_features_enumerate((raptor_feature)i, &name, &uri, &label))
continue;
/* do something with name, uri and label */
}
</pre>
<p>There are more examples of this usage in the source for the
<code class="literal">rapper</code> utility in <code class="filename">util/rapper.c</code>.
</p>
</div>
</div>
<br class="example-break">
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