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<title>pattern: pattern expression handling</title>
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<th width="100%" align="center">libxml2 Reference Manual</th>
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<h2><span class="refentrytitle">pattern</span></h2>
<p>pattern - pattern expression handling</p>
<p>allows to compile and test pattern expressions for nodes either in a tree or based on a parser state. </p>
<p>Author(s): Daniel Veillard </p>
<div class="refsynopsisdiv">
<h2>Synopsis</h2>
<pre class="synopsis">typedef struct _xmlPattern <a href="#xmlPattern">xmlPattern</a>;
typedef enum <a href="#xmlPatternFlags">xmlPatternFlags</a>;
typedef <a href="libxml2-pattern.html#xmlPattern">xmlPattern</a> * <a href="#xmlPatternPtr">xmlPatternPtr</a>;
typedef struct _xmlStreamCtxt <a href="#xmlStreamCtxt">xmlStreamCtxt</a>;
typedef <a href="libxml2-pattern.html#xmlStreamCtxt">xmlStreamCtxt</a> * <a href="#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a>;
void <a href="#xmlFreePattern">xmlFreePattern</a> (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp);
void <a href="#xmlFreePatternList">xmlFreePatternList</a> (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp);
void <a href="#xmlFreeStreamCtxt">xmlFreeStreamCtxt</a> (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> stream);
int <a href="#xmlPatternCompileSafe">xmlPatternCompileSafe</a> (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * pattern, <br> <a href="libxml2-dict.html#xmlDict">xmlDict</a> * dict, <br> int flags, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** namespaces, <br> <a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> * patternOut);
int <a href="#xmlPatternFromRoot">xmlPatternFromRoot</a> (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp);
<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> <a href="#xmlPatternGetStreamCtxt">xmlPatternGetStreamCtxt</a> (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp);
int <a href="#xmlPatternMatch">xmlPatternMatch</a> (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp, <br> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node);
int <a href="#xmlPatternMaxDepth">xmlPatternMaxDepth</a> (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp);
int <a href="#xmlPatternMinDepth">xmlPatternMinDepth</a> (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp);
int <a href="#xmlPatternStreamable">xmlPatternStreamable</a> (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp);
<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> <a href="#xmlPatterncompile">xmlPatterncompile</a> (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * pattern, <br> <a href="libxml2-dict.html#xmlDict">xmlDict</a> * dict, <br> int flags, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** namespaces);
int <a href="#xmlStreamPop">xmlStreamPop</a> (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> stream);
int <a href="#xmlStreamPush">xmlStreamPush</a> (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> stream, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns);
int <a href="#xmlStreamPushAttr">xmlStreamPushAttr</a> (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> stream, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns);
int <a href="#xmlStreamPushNode">xmlStreamPushNode</a> (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> stream, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns, <br> int nodeType);
int <a href="#xmlStreamWantsAnyNode">xmlStreamWantsAnyNode</a> (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> streamCtxt);
</pre>
</div>
<div class="refsect1" lang="en"><h2>Description</h2></div>
<div class="refsect1" lang="en">
<h2>Details</h2>
<div class="refsect2" lang="en">
<div class="refsect2" lang="en">
<h3>
<a name="xmlPattern">Structure </a>xmlPattern</h3>
<pre class="programlisting">struct _xmlPattern {
The content of this structure is not made public by the API.
} xmlPattern;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlPatternFlags">Enum </a>xmlPatternFlags</h3>
<pre class="programlisting">enum <a href="#xmlPatternFlags">xmlPatternFlags</a> {
<a name="XML_PATTERN_DEFAULT">XML_PATTERN_DEFAULT</a> = 0 /* simple pattern match */
<a name="XML_PATTERN_XPATH">XML_PATTERN_XPATH</a> = 1 /* standard XPath pattern */
<a name="XML_PATTERN_XSSEL">XML_PATTERN_XSSEL</a> = 2 /* XPath subset for schema selector */
<a name="XML_PATTERN_XSFIELD">XML_PATTERN_XSFIELD</a> = 4 /* XPath subset for schema field */
};
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlPatternPtr">Typedef </a>xmlPatternPtr</h3>
<pre class="programlisting"><a href="libxml2-pattern.html#xmlPattern">xmlPattern</a> * xmlPatternPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlStreamCtxt">Structure </a>xmlStreamCtxt</h3>
<pre class="programlisting">struct _xmlStreamCtxt {
The content of this structure is not made public by the API.
} xmlStreamCtxt;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlStreamCtxtPtr">Typedef </a>xmlStreamCtxtPtr</h3>
<pre class="programlisting"><a href="libxml2-pattern.html#xmlStreamCtxt">xmlStreamCtxt</a> * xmlStreamCtxtPtr;
</pre>
<p></p>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlFreePattern"></a>xmlFreePattern ()</h3>
<pre class="programlisting">void xmlFreePattern (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp)<br>
</pre>
<p>Free up the memory allocated by @comp</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>an XSLT comp</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlFreePatternList"></a>xmlFreePatternList ()</h3>
<pre class="programlisting">void xmlFreePatternList (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp)<br>
</pre>
<p>Free up the memory allocated by all the elements of @comp</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>an XSLT comp list</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlFreeStreamCtxt"></a>xmlFreeStreamCtxt ()</h3>
<pre class="programlisting">void xmlFreeStreamCtxt (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> stream)<br>
</pre>
<p>Free the stream context</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody><tr>
<td><span class="term"><i><tt>stream</tt></i>:</span></td>
<td>the stream context</td>
</tr></tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlPatternCompileSafe"></a>xmlPatternCompileSafe ()</h3>
<pre class="programlisting">int xmlPatternCompileSafe (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * pattern, <br> <a href="libxml2-dict.html#xmlDict">xmlDict</a> * dict, <br> int flags, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** namespaces, <br> <a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> * patternOut)<br>
</pre>
<p>Compile a pattern. Available since 2.13.0.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>pattern</tt></i>:</span></td>
<td>the pattern to compile</td>
</tr>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>an optional dictionary for interned strings</td>
</tr>
<tr>
<td><span class="term"><i><tt>flags</tt></i>:</span></td>
<td>compilation flags, see <a href="libxml2-pattern.html#xmlPatternFlags">xmlPatternFlags</a>
</td>
</tr>
<tr>
<td><span class="term"><i><tt>namespaces</tt></i>:</span></td>
<td>the prefix definitions, array of [URI, prefix] or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>patternOut</tt></i>:</span></td>
<td>output pattern</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>0 on success, 1 on error, -1 if a memory allocation failed.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlPatternFromRoot"></a>xmlPatternFromRoot ()</h3>
<pre class="programlisting">int xmlPatternFromRoot (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp)<br>
</pre>
<p>Check if the pattern must be looked at from the root.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>the precompiled pattern</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 if true, 0 if false and -1 in case of error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlPatternGetStreamCtxt"></a>xmlPatternGetStreamCtxt ()</h3>
<pre class="programlisting"><a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> xmlPatternGetStreamCtxt (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp)<br>
</pre>
<p>Get a streaming context for that pattern Use <a href="libxml2-pattern.html#xmlFreeStreamCtxt">xmlFreeStreamCtxt</a> to free the context.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>the precompiled pattern</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>a pointer to the context or NULL in case of failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlPatternMatch"></a>xmlPatternMatch ()</h3>
<pre class="programlisting">int xmlPatternMatch (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp, <br> <a href="libxml2-tree.html#xmlNodePtr">xmlNodePtr</a> node)<br>
</pre>
<p>Test whether the node matches the pattern</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>the precompiled pattern</td>
</tr>
<tr>
<td><span class="term"><i><tt>node</tt></i>:</span></td>
<td>a node</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 if it matches, 0 if it doesn't and -1 in case of failure</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlPatternMaxDepth"></a>xmlPatternMaxDepth ()</h3>
<pre class="programlisting">int xmlPatternMaxDepth (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp)<br>
</pre>
<p>Check the maximum depth reachable by a pattern</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>the precompiled pattern</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>-2 if no limit (using //), otherwise the depth, and -1 in case of error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlPatternMinDepth"></a>xmlPatternMinDepth ()</h3>
<pre class="programlisting">int xmlPatternMinDepth (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp)<br>
</pre>
<p>Check the minimum depth reachable by a pattern, 0 mean the / or . are part of the set.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>the precompiled pattern</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>-1 in case of error otherwise the depth,</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlPatternStreamable"></a>xmlPatternStreamable ()</h3>
<pre class="programlisting">int xmlPatternStreamable (<a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> comp)<br>
</pre>
<p>Check if the pattern is streamable i.e. xmlPatternGetStreamCtxt() should work.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>comp</tt></i>:</span></td>
<td>the precompiled pattern</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 if streamable, 0 if not and -1 in case of error.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlPatterncompile"></a>xmlPatterncompile ()</h3>
<pre class="programlisting"><a href="libxml2-pattern.html#xmlPatternPtr">xmlPatternPtr</a> xmlPatterncompile (const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * pattern, <br> <a href="libxml2-dict.html#xmlDict">xmlDict</a> * dict, <br> int flags, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> ** namespaces)<br>
</pre>
<p>Compile a pattern.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>pattern</tt></i>:</span></td>
<td>the pattern to compile</td>
</tr>
<tr>
<td><span class="term"><i><tt>dict</tt></i>:</span></td>
<td>an optional dictionary for interned strings</td>
</tr>
<tr>
<td><span class="term"><i><tt>flags</tt></i>:</span></td>
<td>compilation flags, see <a href="libxml2-pattern.html#xmlPatternFlags">xmlPatternFlags</a>
</td>
</tr>
<tr>
<td><span class="term"><i><tt>namespaces</tt></i>:</span></td>
<td>the prefix definitions, array of [URI, prefix] or NULL</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>the compiled form of the pattern or NULL in case of error</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlStreamPop"></a>xmlStreamPop ()</h3>
<pre class="programlisting">int xmlStreamPop (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> stream)<br>
</pre>
<p>push one level from the stream.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>stream</tt></i>:</span></td>
<td>the stream context</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>-1 in case of error, 0 otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlStreamPush"></a>xmlStreamPush ()</h3>
<pre class="programlisting">int xmlStreamPush (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> stream, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns)<br>
</pre>
<p>Push new data onto the stream. NOTE: if the call xmlPatterncompile() indicated a dictionary, then strings for name and ns will be expected to come from the dictionary. Both @name and @ns being NULL means the / i.e. the root of the document. This can also act as a reset. Otherwise the function will act as if it has been given an element-node.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>stream</tt></i>:</span></td>
<td>the stream context</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>the current name</td>
</tr>
<tr>
<td><span class="term"><i><tt>ns</tt></i>:</span></td>
<td>the namespace name</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>-1 in case of error, 1 if the current state in the stream is a match and 0 otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlStreamPushAttr"></a>xmlStreamPushAttr ()</h3>
<pre class="programlisting">int xmlStreamPushAttr (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> stream, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns)<br>
</pre>
<p>Push new <a href="libxml2-SAX.html#attribute">attribute</a> data onto the stream. NOTE: if the call xmlPatterncompile() indicated a dictionary, then strings for name and ns will be expected to come from the dictionary. Both @name and @ns being NULL means the / i.e. the root of the document. This can also act as a reset. Otherwise the function will act as if it has been given an attribute-node.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>stream</tt></i>:</span></td>
<td>the stream context</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>the current name</td>
</tr>
<tr>
<td><span class="term"><i><tt>ns</tt></i>:</span></td>
<td>the namespace name</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>-1 in case of error, 1 if the current state in the stream is a match and 0 otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlStreamPushNode"></a>xmlStreamPushNode ()</h3>
<pre class="programlisting">int xmlStreamPushNode (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> stream, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * name, <br> const <a href="libxml2-xmlstring.html#xmlChar">xmlChar</a> * ns, <br> int nodeType)<br>
</pre>
<p>Push new data onto the stream. NOTE: if the call xmlPatterncompile() indicated a dictionary, then strings for name and ns will be expected to come from the dictionary. Both @name and @ns being NULL means the / i.e. the root of the document. This can also act as a reset. Different from xmlStreamPush() this function can be fed with nodes of type: element-, attribute-, text-, cdata-section-, comment- and processing-instruction-node.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>stream</tt></i>:</span></td>
<td>the stream context</td>
</tr>
<tr>
<td><span class="term"><i><tt>name</tt></i>:</span></td>
<td>the current name</td>
</tr>
<tr>
<td><span class="term"><i><tt>ns</tt></i>:</span></td>
<td>the namespace name</td>
</tr>
<tr>
<td><span class="term"><i><tt>nodeType</tt></i>:</span></td>
<td>the type of the node being pushed</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>-1 in case of error, 1 if the current state in the stream is a match and 0 otherwise.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
<div class="refsect2" lang="en">
<h3>
<a name="xmlStreamWantsAnyNode"></a>xmlStreamWantsAnyNode ()</h3>
<pre class="programlisting">int xmlStreamWantsAnyNode (<a href="libxml2-pattern.html#xmlStreamCtxtPtr">xmlStreamCtxtPtr</a> streamCtxt)<br>
</pre>
<p>Query if the streaming pattern additionally needs to be fed with text-, cdata-section-, comment- and processing-instruction-nodes. If the result is 0 then only element-nodes and attribute-nodes need to be pushed.</p>
<div class="variablelist"><table border="0">
<col align="left">
<tbody>
<tr>
<td><span class="term"><i><tt>streamCtxt</tt></i>:</span></td>
<td>the stream context</td>
</tr>
<tr>
<td><span class="term"><i><tt>Returns</tt></i>:</span></td>
<td>1 in case of need of nodes of the above described types, 0 otherwise. -1 on API errors.</td>
</tr>
</tbody>
</table></div>
</div>
<hr>
</div>
</div>
</body>
</html>