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<title>Listing built-in functionality</title>
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<div class="chapter">
<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
lists of parsers and serializers. The list built into the
library can be found by means of
<span class="emphasis"><em>description</em></span> functions. These take as input an
<code class="literal">int</code> counter and return descriptions of the object
at that offset in the list. The return value is a pointer to a
shared, read-only description of the object, or NULL if the counter
has gone too far into the list.
</p>
<div class="variablelist">
<p class="title"><b>Listing Functionality with Descriptions</b></p>
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<td><p><span class="term">Get descriptions of the parser syntaxes</span></p></td>
<td><pre class="programlisting">
const raptor_syntax_description*
raptor_world_get_parser_description(raptor_world* world,
unsigned int counter);
</pre></td>
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<tr>
<td><p><span class="term">Get descriptions of the serializer syntaxes</span></p></td>
<td><pre class="programlisting">
const raptor_syntax_description*
raptor_world_get_serializer_description(raptor_world* world,
unsigned int counter);
</pre></td>
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<td><p><span class="term">Get descriptions of options</span></p></td>
<td>
<pre class="programlisting">
raptor_option_description*
raptor_world_get_option_description(raptor_world* world,
const raptor_domain domain,
const raptor_option option);
</pre>
<p>
Call with the appropriate domains for the class such as
<a class="link" href="raptor2-section-general.html#RAPTOR-DOMAIN-PARSER:CAPS"><code class="literal">RAPTOR_DOMAIN_PARSER</code></a>,
<a class="link" href="raptor2-section-general.html#RAPTOR-DOMAIN-SERIALIZER:CAPS"><code class="literal">RAPTOR_DOMAIN_SERIALIZER</code></a>
etc. See the
<a class="link" href="raptor2-section-general.html#raptor-domain" title="enum raptor_domain"><code class="literal">raptor_domain</code></a>
description for the full list.
</p>
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<p>These functions can be called directly after creating a
raptor world object with
<a class="link" href="raptor2-section-world.html#raptor-new-world" title="raptor_new_world"><code class="function">raptor_new_world()</code></a>.
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 class="link" href="raptor2-section-parser.html#raptor-new-parser-for-content" title="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-options"></a><p class="title"><b>Example 1. List all parser options using option description</b></p>
<div class="example-contents">
<pre class="programlisting">
unsigned int i;
for(i = 0; i < raptor_option_get_count(); i++) {
raptor_option_description* od;
od = raptor_world_get_option_description(world, RAPTOR_DOMAIN_PARSER, i);
if(od) {
/* do something with od fields such as od->name, od->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>
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