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v2.14.2
doc/devhelp/libxml2-pattern.html
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Nick Wellnhofer
Update documentation for 2.14.0
27 мар 2025, 17:17
27 мар 2025, 17:17
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<html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>pattern: pattern expression handling</title> <meta name="generator" content="Libxml2 devhelp stylesheet"> <link rel="start" href="index.html" title="libxml2 Reference Manual"> <link rel="up" href="general.html" title="API"> <link rel="stylesheet" href="style.css" type="text/css"> <link rel="chapter" href="general.html" title="API"> </head> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"> <table class="navigation" width="100%" summary="Navigation header" cellpadding="2" cellspacing="2"><tr valign="middle"> <td><a accesskey="p" href="libxml2-parserInternals.html"><img src="left.png" width="24" height="24" border="0" alt="Prev"></a></td> <td><a accesskey="u" href="general.html"><img src="up.png" width="24" height="24" border="0" alt="Up"></a></td> <td><a accesskey="h" href="index.html"><img src="home.png" width="24" height="24" border="0" alt="Home"></a></td> <td><a accesskey="n" href="libxml2-relaxng.html"><img src="right.png" width="24" height="24" border="0" alt="Next"></a></td> <th width="100%" align="center">libxml2 Reference Manual</th> </tr></table> <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 attribute 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>