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148 lines
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<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
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<title>Listing built-in functionality</title>
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<meta name="generator" content="DocBook XSL Stylesheets V1.73.2">
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<link rel="start" href="index.html" title="Raptor RDF Syntax Parsing and Serializing Library Manual">
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<link rel="up" href="tutorial.html" title="Part I. Raptor Tutorial">
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<link rel="part" href="tutorial.html" title="Part I. Raptor Tutorial">
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<link rel="chapter" href="tutorial-initialising-finishing.html" title="Initialising and Finishing using the Library">
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<link rel="chapter" href="tutorial-querying-functionality.html" title="Listing built-in functionality">
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<link rel="chapter" href="tutorial-parsing.html" title="Parsing syntaxes to RDF Triples">
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<link rel="chapter" href="tutorial-serializing.html" title="Serializing RDF triples to a syntax">
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<link rel="part" href="reference-manual.html" title="Part II. Raptor Reference Manual">
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<link rel="chapter" href="raptor-parsers.html" title="Parsers in Raptor (syntax to triples)">
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<div class="chapter" lang="en">
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<div class="titlepage"><div><div><h2 class="title">
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<a name="tutorial-querying-functionality"></a>Listing built-in functionality</h2></div></div></div>
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<p>
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Raptor can be configured and compiled with support for different
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parsers and serializers. Lists of the functionality built into the
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library can be interrogated by means of
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<span class="emphasis"><em>enumerate</em></span> functions. These take as input an
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<code class="literal">int</code> counter and return descriptions of the feature
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at that offset in the list. The descriptions are returned stored in
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the variables pointed to by the reference arguments of the
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<code class="literal">**</code><span class="emphasis"><em>var</em></span> form.
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The return value of the function is non-zero when the counter has
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gone too far.
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</p>
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<div class="variablelist">
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<p class="title"><b>Listing Functionality with Enumeration</b></p>
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<table border="0">
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<col align="left" valign="top">
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<tbody>
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<tr>
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<td><p><span class="term">List the parse syntaxes (parser names)</span></p></td>
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<td><pre class="programlisting">
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int
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raptor_parsers_enumerate(const unsigned int counter,
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const char **name, const char **label);
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</pre></td>
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</tr>
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<tr>
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<td><p><span class="term">List the parse syntaxes
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(same as above but with more information)</span></p></td>
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<td><pre class="programlisting">
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int
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raptor_syntaxes_enumerate(const unsigned int counter,
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const char **name,
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const char **label,
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const char **mime_type,
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const unsigned char **uri_string);
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</pre></td>
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</tr>
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<tr>
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<td><p><span class="term">List the serializer syntaxes (serializer names)</span></p></td>
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<td><pre class="programlisting">
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int
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raptor_serializers_enumerate(const unsigned int counter,
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const char **name,
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const char **label,
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const char **mime_type,
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const unsigned char **uri_string);
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</pre></td>
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</tr>
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<tr>
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<td><p><span class="term">List the Parser features</span></p></td>
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<td><pre class="programlisting">
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int
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raptor_features_enumerate(const raptor_feature feature,
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const char **name, raptor_uri **uri,
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const char **label);
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</pre></td>
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</tr>
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<tr>
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<td><p><span class="term">List the Serializer features</span></p></td>
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<td><pre class="programlisting">
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int
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raptor_serializer_features_enumerate(const raptor_feature feature,
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const char **name,
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raptor_uri **uri,
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const char **label);
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</pre></td>
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</tr>
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<tr>
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<td><p><span class="term">List the XML Writer features</span></p></td>
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<td><pre class="programlisting">
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int
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raptor_xml_writer_features_enumerate(const raptor_feature feature,
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const char **name,
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raptor_uri **uri,
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const char **label);
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</pre></td>
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</tr>
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</tbody>
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</table>
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</div>
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<p>These functions can be called directly after
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<a class="link" href="raptor-section-general.html#raptor-init" title="raptor_init ()"><code class="function">raptor_init()</code></a>
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has been called so can be used to find name parameters for creating
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parser and serializer instances. This is one way to find a parser
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(name) by it's MIME Type, the other is to use the mime_type parameter
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of the
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<a class="link" href="raptor-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>
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<div class="example">
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<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>
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<div class="example-contents">
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<pre class="programlisting">
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int i;
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for(i=0; i < RAPTOR_FEATURE_LAST; i++) {
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const char *name;
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raptor_uri *uri;
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const char *label;
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if(raptor_features_enumerate((raptor_feature)i, &name, &uri, &label))
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continue;
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/* do something with name, uri and label */
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}
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</pre>
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<p>There are more examples of this usage in the source for the
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<code class="literal">rapper</code> utility in <code class="filename">util/rapper.c</code>.
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</p>
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</div>
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</div>
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<br class="example-break">
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</div>
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<div class="footer">
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<hr>
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