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<!DOCTYPE html>
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<title> expat - XML parser </title>
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<h1> expat </h1>
<h2> XML parser </h2>
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<h2 id="local-expat-requireexpat"><code>local expat = require'expat'</code></h2>
<p>A ffi binding for the <a href="http://expat.sourceforge.net/">Expat XML parser</a>.</p>
<h2 id="expat.parsesource-callbacks"><code>expat.parse(source, callbacks)</code></h2>
<p>Parse a XML from a string, cdata, file, or reader function, calling a callback for each piece of the XML parsed.</p>
<pre class="sourceCode lua"><code class="sourceCode lua"><span class="kw">source</span> <span class="ot">=</span> <span class="ot">{</span><span class="kw">path</span> <span class="ot">=</span> <span class="kw">S</span><span class="ot">}</span> | <span class="ot">{</span><span class="kw">string</span> <span class="ot">=</span> <span class="kw">S</span><span class="ot">}</span> | <span class="ot">{</span><span class="kw">cdata</span> <span class="ot">=</span> <span class="kw">CDATA</span><span class="ot">,</span> <span class="kw">size</span> <span class="ot">=</span> <span class="kw">N</span><span class="ot">}</span> | <span class="ot">{</span><span class="fu">read</span> <span class="ot">=</span> <span class="kw">read_function</span><span class="ot">}</span>
<span class="kw">callbacks</span> <span class="ot">=</span> <span class="ot">{</span>
<span class="kw">element</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">name</span><span class="ot">,</span> <span class="kw">model</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">attr_list</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">elem</span><span class="ot">,</span> <span class="kw">name</span><span class="ot">,</span> <span class="fu">type</span><span class="ot">,</span> <span class="kw">dflt</span><span class="ot">,</span> <span class="kw">is_required</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">xml</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">version</span><span class="ot">,</span> <span class="kw">encoding</span><span class="ot">,</span> <span class="kw">standalone</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">entity</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">name</span><span class="ot">,</span> <span class="kw">is_param_entity</span><span class="ot">,</span> <span class="kw">val</span><span class="ot">,</span> <span class="kw">base</span><span class="ot">,</span> <span class="kw">sysid</span><span class="ot">,</span> <span class="kw">pubid</span><span class="ot">,</span> <span class="kw">notation</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">start_tag</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">name</span><span class="ot">,</span> <span class="kw">attrs</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">end_tag</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">name</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">cdata</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">s</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">pi</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">target</span><span class="ot">,</span> <span class="kw">data</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">comment</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">s</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">start_cdata</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">()</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">end_cdata</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">()</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">default</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">s</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">default_expand</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">s</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">start_doctype</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">name</span><span class="ot">,</span> <span class="kw">sysid</span><span class="ot">,</span> <span class="kw">pubid</span><span class="ot">,</span> <span class="kw">has_internal_subset</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">end_doctype</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">()</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">unparsed</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">name</span><span class="ot">,</span> <span class="kw">base</span><span class="ot">,</span> <span class="kw">sysid</span><span class="ot">,</span> <span class="kw">pubid</span><span class="ot">,</span> <span class="kw">notation</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">notation</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">name</span><span class="ot">,</span> <span class="kw">base</span><span class="ot">,</span> <span class="kw">sysid</span><span class="ot">,</span> <span class="kw">pubid</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">start_namespace</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">prefix</span><span class="ot">,</span> <span class="kw">uri</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">end_namespace</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">prefix</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">not_standalone</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">()</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">ref</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">parser</span><span class="ot">,</span> <span class="kw">context</span><span class="ot">,</span> <span class="kw">base</span><span class="ot">,</span> <span class="kw">sysid</span><span class="ot">,</span> <span class="kw">pubid</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">skipped</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">name</span><span class="ot">,</span> <span class="kw">is_parameter_entity</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="kw">unknown</span> <span class="ot">=</span> <span class="kw">function</span><span class="ot">(</span><span class="kw">name</span><span class="ot">,</span> <span class="kw">info</span><span class="ot">)</span> <span class="kw">end</span><span class="ot">,</span>
<span class="ot">}</span></code></pre>
<h2 id="expat.treeparsesource-known_tags---root_node"><code>expat.treeparse(source, [known_tags]) -> root_node</code></h2>
<p>Parse a XML to a tree of nodes. known_tags filters the output so that only the tags that known_tags indexes are returned.</p>
<p>Nodes look like this:</p>
<pre><code>node = {tag=, attrs={<k>=v}, children={node1,...}, tags={<tag> = node}, cdata=, parent=}</code></pre>
<h2 id="expat.childrennode-tag---iter---node"><code>expat.children(node, tag) -> iter() -> node</code></h2>
<p>Iterate a node's children that have a specific tag.</p>
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