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updating libxslt tutorial to include param support

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Mon Jul 23 09:32:27 MDT 2001 John Fleck <jfleck@inkstain.net>

	* updating libxslt tutorial to include param support
This commit is contained in:
MDT 2001 John Fleck
2001-07-23 15:34:28 +00:00
committed by John Fleck
parent ca2e262335
commit c43b7da657
4 changed files with 212 additions and 92 deletions
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4
ChangeLog
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@ -1,3 +1,7 @@
Mon Jul 23 09:32:27 MDT 2001 John Fleck <jfleck@inkstain.net>
* updating libxslt tutorial to include param support
Mon Jul 23 20:12:38 CEST 2001 Daniel Veillard <daniel@veillard.com> Mon Jul 23 20:12:38 CEST 2001 Daniel Veillard <daniel@veillard.com>
* libexslt/math.c: small cleanup * libexslt/math.c: small cleanup

34
doc/tutorial/libxslt_tutorial.c
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@ -21,6 +21,7 @@
* *
*/ */
#include <string.h>
#include <libxml/xmlmemory.h> #include <libxml/xmlmemory.h>
#include <libxml/debugXML.h> #include <libxml/debugXML.h>
#include <libxml/HTMLtree.h> #include <libxml/HTMLtree.h>
@ -39,10 +40,15 @@ extern int xmlLoadExtDtdDefaultValue;
static void usage(const char *name) { static void usage(const char *name) {
printf("Usage: %s [options] stylesheet file [file ...]\n", name); printf("Usage: %s [options] stylesheet file [file ...]\n", name);
printf(" --param name value : pass a (parameter,value) pair\n");
} }
int int
main(int argc, char **argv) { main(int argc, char **argv) {
int i;
const char *params[16 + 1];
int nbparams = 0;
xsltStylesheetPtr cur = NULL; xsltStylesheetPtr cur = NULL;
xmlDocPtr doc, res; xmlDocPtr doc, res;
@ -51,11 +57,33 @@ main(int argc, char **argv) {
return(1); return(1);
} }
for (i = 1; i < argc; i++) {
if (argv[i][0] != '-')
break;
if ((!strcmp(argv[i], "-param")) ||
(!strcmp(argv[i], "--param"))) {
i++;
params[nbparams++] = argv[i++];
params[nbparams++] = argv[i];
if (nbparams >= 16) {
fprintf(stderr, "too many params\n");
return (1);
}
} else {
fprintf(stderr, "Unknown option %s\n", argv[i]);
usage(argv[0]);
return (1);
}
}
params[nbparams] = NULL;
xmlSubstituteEntitiesDefault(1); xmlSubstituteEntitiesDefault(1);
xmlLoadExtDtdDefaultValue = 1; xmlLoadExtDtdDefaultValue = 1;
cur = xsltParseStylesheetFile((const xmlChar *)argv[1]); cur = xsltParseStylesheetFile((const xmlChar *)argv[i]);
doc = xmlParseFile(argv[2]); i++;
res = xsltApplyStylesheet(cur, doc, NULL); doc = xmlParseFile(argv[i]);
res = xsltApplyStylesheet(cur, doc, params);
xsltSaveResultToFile(stdout, res, cur); xsltSaveResultToFile(stdout, res, cur);
xsltFreeStylesheet(cur); xsltFreeStylesheet(cur);

217
doc/tutorial/libxslttutorial.html
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@ -3,18 +3,17 @@
<head> <head>
<meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type"> <meta content="text/html; charset=ISO-8859-1" http-equiv="Content-Type">
<title>libxslt Tutorial</title> <title>libxslt Tutorial</title>
<meta name="generator" content="DocBook XSL Stylesheets V1.29"> <meta name="generator" content="DocBook XSL Stylesheets V1.41">
</head> </head>
<body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div id="id2741878" class="article"> <body bgcolor="white" text="black" link="#0000FF" vlink="#840084" alink="#0000FF"><div class="article">
<div class="titlepage"> <div class="titlepage">
<div><h1 class="title"> <div><h1 class="title">
<a name="id2741878"></a>libxslt Tutorial</h1></div> <a name="id2702588"></a>libxslt Tutorial</h1></div>
<div><h3 class="author">John Fleck</h3></div> <div><h3 class="author">John Fleck</h3></div>
<div><span class="releaseinfo"> <div><p class="releaseinfo">
This is version 0.2 of the libxslt Tutorial This is version 0.3 of the libxslt Tutorial
<br> </p></div>
</span></div> <div><p class="copyright">Copyright <20> 2001 John Fleck</p></div>
<div><p class="copyright">Copyright <20> 2001 by John Fleck</p></div>
<div><div class="legalnotice"><p>Permission is granted to copy, distribute and/or modify this <div><div class="legalnotice"><p>Permission is granted to copy, distribute and/or modify this
document under the terms of the <i>GNU Free Documentation document under the terms of the <i>GNU Free Documentation
License</i>, Version 1.1 or any later version License</i>, Version 1.1 or any later version
@ -41,15 +40,18 @@
</dt> </dt>
<dt> <a href="#saveresult">Saving the result</a> <dt> <a href="#saveresult">Saving the result</a>
</dt> </dt>
<dt> <a href="#parameters">Parameters</a>
</dt>
<dt> <a href="#cleanup">Cleanup</a> <dt> <a href="#cleanup">Cleanup</a>
</dt> </dt>
</dl></dd> </dl></dd>
<dt>A <a href="#thecode">The Code</a>
</dt>
</dl> </dl>
</div> </div>
<div class="abstract"> <div class="abstract">
<p> <p>
<a name="id2692706"></a> <a name="id2708071"></a><b>Abstract</b>
<b>Abstract</b>
</p> </p>
<p>A tutorial on building a simple application using the <p>A tutorial on building a simple application using the
libxslt library to perform libxslt library to perform
@ -57,11 +59,8 @@
XML file into HTML.</p> XML file into HTML.</p>
</div> </div>
<div class="sect1"> <div class="sect1">
<a name="introduction"></a> <a name="introduction"></a><div class="titlepage"><div><h2 class="title" style="clear: both">
<div class="titlepage"><div><h2 class="title" style="clear: all"> <a name="introduction"></a>Introduction</h2></div></div>
<a name="introduction"></a>
<span class="title">Introduction</span>
</h2></div></div>
<p>The Extensible Markup Language (XML) is a World <p>The Extensible Markup Language (XML) is a World
Wide Web Consortium standard for the exchange of structured data in text Wide Web Consortium standard for the exchange of structured data in text
form. Its popularity stems from its universality. Any computer can form. Its popularity stems from its universality. Any computer can
@ -81,7 +80,8 @@
transformations. transformations.
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"> <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title"><a name="id2741924">Note</a></h3> <h3 class="title">
<a name="id2754806"></a>Note</h3>
<p> <p>
While libxslt was written While libxslt was written
under the auspices of the GNOME project, it does not under the auspices of the GNOME project, it does not
@ -108,45 +108,55 @@
<p>References: <p>References:
<div class="itemizedlist"><ul> <div class="itemizedlist"><ul>
<li><p> <li><p>
<a name="id2691214"></a> <a name="id2754758"></a><a href="http://www.w3.org/XML/" target="_top">W3C XML page</a>
<a href="http://www.w3.org/XML/" target="_top">W3C XML page</a>
</p></li> </p></li>
<li><p> <li><p>
<a name="id2691235"></a> <a name="id2705552"></a><a href="http://www.w3.org/Style/XSL/" target="_top">W3C
<a href="http://www.w3.org/Style/XSL/" target="_top">W3C
XSL page.</a> XSL page.</a>
</p></li> </p></li>
<li><p> <li><p>
<a name="id2691256"></a> <a name="id2705573"></a><a href="http://xmlsoft.org/XSLT/" target="_top">libxslt</a>
<a href="http://xmlsoft.org/XSLT/" target="_top">libxslt</a>
</p></li> </p></li>
</ul></div> </ul></div>
</p> </p>
</div> </div>
<div class="sect1"> <div class="sect1">
<a name="functions"></a> <a name="functions"></a><div class="titlepage"><div><h2 class="title" style="clear: both">
<div class="titlepage"><div><h2 class="title" style="clear: all"> <a name="functions"></a>Primary Functions</h2></div></div>
<a name="functions"></a> <div class="toc">
<span class="title">Primary Functions</span> <p><b>Table of Contents</b></p>
</h2></div></div> <dl>
<dt> <a href="#preparing">Preparing to Parse</a>
</dt>
<dt> <a href="#parsethestylesheet">Parse the Stylesheet</a>
</dt>
<dt> <a href="#parseinputfile">Parse the Input File</a>
</dt>
<dt> <a href="#applyingstylesheet">Applying the Stylesheet</a>
</dt>
<dt> <a href="#saveresult">Saving the result</a>
</dt>
<dt> <a href="#parameters">Parameters</a>
</dt>
<dt> <a href="#cleanup">Cleanup</a>
</dt>
</dl>
</div>
<p>To transform an XML file, you must perform three <p>To transform an XML file, you must perform three
functions: functions:
<div class="orderedlist"><ol type="1"> <div class="orderedlist"><ol type="1">
<li><p> <li><p>
<a name="id2691302"></a>parse the input file</p></li> <a name="id2705618"></a>parse the input file</p></li>
<li><p> <li><p>
<a name="id2691310"></a>parse the stylesheet</p></li> <a name="id2705627"></a>parse the stylesheet</p></li>
<li><p> <li><p>
<a name="id2691319"></a>apply the stylesheet</p></li> <a name="id2705635"></a>apply the stylesheet</p></li>
</ol></div> </ol></div>
</p> </p>
<div class="sect2"> <div class="sect2">
<a name="preparing"></a> <a name="preparing"></a><div class="titlepage"><div><h3 class="title">
<div class="titlepage"><div><h3 class="title"> <a name="preparing"></a>Preparing to Parse</h3></div></div>
<a name="preparing"></a>
<span class="title">Preparing to Parse</span>
</h3></div></div>
<p>Before you can begin parsing input files or stylesheets, there are <p>Before you can begin parsing input files or stylesheets, there are
several steps you need to take to set up entity handling. These steps are several steps you need to take to set up entity handling. These steps are
not unique to libxslt. Any not unique to libxslt. Any
@ -162,20 +172,17 @@
</p> </p>
<p>Second, set <tt>xmlLoadExtDtdDefaultValue</tt> equal to <p>Second, set <tt>xmlLoadExtDtdDefaultValue</tt> equal to
<i><tt>1</tt></i>. This tells libxml <i><tt>1</tt></i>. This tells libxml
to load external entity subsets. If you do not do this and the file your to load external entity subsets. If you do not do this and your
input file includes entities through external subsets, you will get input file includes entities through external subsets, you will get
errors.</p> errors.</p>
</div> </div>
<div class="sect2"> <div class="sect2">
<a name="parsethestylesheet"></a> <a name="parsethestylesheet"></a><div class="titlepage"><div><h3 class="title">
<div class="titlepage"><div><h3 class="title"> <a name="parsethestylesheet"></a>Parse the Stylesheet</h3></div></div>
<a name="parsethestylesheet"></a>
<span class="title">Parse the Stylesheet</span>
</h3></div></div>
<p>Parsing the stylesheet takes a single function call, which takes a <p>Parsing the stylesheet takes a single function call, which takes a
variable of type xmlChar: variable of type xmlChar:
<pre class="programlisting"> <pre class="programlisting">
<tt>cur</tt> = xsltParseStylesheetFile((const xmlChar *)argv[1]); <tt>cur</tt> = xsltParseStylesheetFile((const xmlChar *)argv[i]);
</pre> </pre>
In this case, I cast the stylesheet file name, passed in as a In this case, I cast the stylesheet file name, passed in as a
command line argument, to <i>xmlChar</i>. The return value command line argument, to <i>xmlChar</i>. The return value
@ -186,14 +193,11 @@
</p> </p>
</div> </div>
<div class="sect2"> <div class="sect2">
<a name="parseinputfile"></a> <a name="parseinputfile"></a><div class="titlepage"><div><h3 class="title">
<div class="titlepage"><div><h3 class="title"> <a name="parseinputfile"></a>Parse the Input File</h3></div></div>
<a name="parseinputfile"></a>
<span class="title">Parse the Input File</span>
</h3></div></div>
<p>Parsing the input file takes a single function call: <p>Parsing the input file takes a single function call:
<pre class="programlisting"> <pre class="programlisting">
doc = xmlParseFile(argv[2]); doc = xmlParseFile(argv[i]);
</pre> </pre>
It returns an <i>xmlDocPtr</i>, a struct in memory that It returns an <i>xmlDocPtr</i>, a struct in memory that
contains the document tree. It can be manipulated directly, but for this contains the document tree. It can be manipulated directly, but for this
@ -201,30 +205,24 @@ doc = xmlParseFile(argv[2]);
</p> </p>
</div> </div>
<div class="sect2"> <div class="sect2">
<a name="applyingstylesheet"></a> <a name="applyingstylesheet"></a><div class="titlepage"><div><h3 class="title">
<div class="titlepage"><div><h3 class="title"> <a name="applyingstylesheet"></a>Applying the Stylesheet</h3></div></div>
<a name="applyingstylesheet"></a>
<span class="title">Applying the Stylesheet</span>
</h3></div></div>
<p>Now that you have trees representing the document and the stylesheet <p>Now that you have trees representing the document and the stylesheet
in memory, apply the stylesheet to the document. The in memory, apply the stylesheet to the document. The
function that does this is <tt>xsltApplyStylesheet</tt>: function that does this is <tt>xsltApplyStylesheet</tt>:
<pre class="programlisting"> <pre class="programlisting">
res = xsltApplyStylesheet(cur, doc, NULL); res = xsltApplyStylesheet(cur, doc, params);
</pre> </pre>
For parameters, the function takes an xsltStylesheetPtr and an The function takes an xsltStylesheetPtr and an
xmlDocPtr, the values returned by the previous two functions. The third xmlDocPtr, the values returned by the previous two functions. The third
parameter, NULL in this case, can be used to pass parameters to the variable, <tt>params</tt> can be used to pass
stylesheet. It is a NULL-terminated array of name/value pairs of const XSLT parameters to the stylesheet. It is a
char's. NULL-terminated array of name/value pairs of const char's.
</p> </p>
</div> </div>
<div class="sect2"> <div class="sect2">
<a name="saveresult"></a> <a name="saveresult"></a><div class="titlepage"><div><h3 class="title">
<div class="titlepage"><div><h3 class="title"> <a name="saveresult"></a>Saving the result</h3></div></div>
<a name="saveresult"></a>
<span class="title">Saving the result</span>
</h3></div></div>
<p>libxslt includes a family of functions to use in <p>libxslt includes a family of functions to use in
saving the resulting output. For this example, saving the resulting output. For this example,
<tt>xsltSaveResultToFile</tt> is used, and the results are <tt>xsltSaveResultToFile</tt> is used, and the results are
@ -235,7 +233,8 @@ xsltSaveResultToFile(stdout, res, cur);
</pre> </pre>
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;"> <div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title"><a name="id2691572">Note</a></h3> <h3 class="title">
<a name="id2708523"></a>Note</h3>
<p>libxml also contains output <p>libxml also contains output
functions, such as <tt>xmlSaveFile</tt>, which can be functions, such as <tt>xmlSaveFile</tt>, which can be
used here. However, output-related information contained in the used here. However, output-related information contained in the
@ -246,11 +245,39 @@ xsltSaveResultToFile(stdout, res, cur);
</p> </p>
</div> </div>
<div class="sect2"> <div class="sect2">
<a name="cleanup"></a> <a name="parameters"></a><div class="titlepage"><div><h3 class="title">
<div class="titlepage"><div><h3 class="title"> <a name="parameters"></a>Parameters</h3></div></div>
<a name="cleanup"></a> <p>
<span class="title">Cleanup</span> In XSLT, parameters may be used as a way to pass
</h3></div></div> additional information to a
stylesheet. libxslt accepts
XSLT parameters as one of the values passed to
<tt>xsltApplyStylesheet</tt>.
</p>
<p>
In the tutorial example and in xsltproc,
on which the tutorial example is based, parameters to be passed take the
form of key-value pairs. The program collects them from command line
arguments, inserting them in the array <tt>params</tt>, then
passes them to the function. The final element in the array is set to
<i><tt>NULL</tt></i>.
<div class="note" style="margin-left: 0.5in; margin-right: 0.5in;">
<h3 class="title">
<a name="id2708604"></a>Note</h3>
<p>
If a parameter being passed is a string rather than an
XSLT node, it must be escaped. For the tutorial
program, that would be done as follows:
<b>tutorial]$ ./libxslt_tutorial --param rootid &quot;'asect1'&quot;
stylesheet.xsl filename.xml</b>
</p>
</div>
</p>
</div>
<div class="sect2">
<a name="cleanup"></a><div class="titlepage"><div><h3 class="title">
<a name="cleanup"></a>Cleanup</h3></div></div>
<p>After you are finished, libxslt and <p>After you are finished, libxslt and
libxml provide functions for deallocating libxml provide functions for deallocating
memory. memory.
@ -263,29 +290,31 @@ xsltSaveResultToFile(stdout, res, cur);
xmlFreeDoc(doc);<a name="cleanupdoc"></a><img src="../images/callouts/3.png" alt="3" border="0"> xmlFreeDoc(doc);<a name="cleanupdoc"></a><img src="../images/callouts/3.png" alt="3" border="0">
</pre> </pre>
<div class="calloutlist"><table border="0" summary="Callout list"> <div class="calloutlist">
<a name="id2708906"></a><table border="0" summary="Callout list">
<tr> <tr>
<td width="5%" valign="top" align="left"> <td width="5%" valign="top" align="left">
<a href="#cleanupstylesheet"><img src="../images/callouts/1.png" alt="1" border="0"></a> </td> <a name="id2708911"></a><a href="#cleanupstylesheet"><img src="../images/callouts/1.png" alt="1" border="0"></a> </td>
<td valign="top" align="left"><p>Free the memory used by your stylesheet.</p></td> <td valign="top" align="left"><p>Free the memory used by your stylesheet.</p></td>
</tr> </tr>
<tr> <tr>
<td width="5%" valign="top" align="left"> <td width="5%" valign="top" align="left">
<a href="#cleanupresults"><img src="../images/callouts/2.png" alt="2" border="0"></a> </td> <a name="id2709027"></a><a href="#cleanupresults"><img src="../images/callouts/2.png" alt="2" border="0"></a> </td>
<td valign="top" align="left"><p>Free the memory used by the results document.</p></td> <td valign="top" align="left"><p>Free the memory used by the results document.</p></td>
</tr> </tr>
<tr> <tr>
<td width="5%" valign="top" align="left"> <td width="5%" valign="top" align="left">
<a href="#cleanupdoc"><img src="../images/callouts/3.png" alt="3" border="0"></a> </td> <a name="id2709045"></a><a href="#cleanupdoc"><img src="../images/callouts/3.png" alt="3" border="0"></a> </td>
<td valign="top" align="left"><p>Free the memory used by your original document.</p></td> <td valign="top" align="left"><p>Free the memory used by your original document.</p></td>
</tr> </tr>
</table></div> </table>
</div>
</p> </p>
</div> </div>
</div> </div>
<div id="thecode" class="appendix"> <div class="appendix">
<h2 class="title" style="clear: all"> <h2 class="title" style="clear: both">
<a name="thecode"></a>Appendix A. The Code</h2> <a name="thecode"></a>A. The Code</h2>
<p> <p>
<tt>libxslt_tutorial.c</tt> <tt>libxslt_tutorial.c</tt>
<pre class="programlisting"> <pre class="programlisting">
@ -311,6 +340,7 @@ xsltSaveResultToFile(stdout, res, cur);
* *
*/ */
#include &lt;string.h&gt;
#include &lt;libxml/xmlmemory.h&gt; #include &lt;libxml/xmlmemory.h&gt;
#include &lt;libxml/debugXML.h&gt; #include &lt;libxml/debugXML.h&gt;
#include &lt;libxml/HTMLtree.h&gt; #include &lt;libxml/HTMLtree.h&gt;
@ -329,10 +359,15 @@ extern int xmlLoadExtDtdDefaultValue;
static void usage(const char *name) { static void usage(const char *name) {
printf(&quot;Usage: %s [options] stylesheet file [file ...]\n&quot;, name); printf(&quot;Usage: %s [options] stylesheet file [file ...]\n&quot;, name);
printf(&quot; --param name value : pass a (parameter,value) pair\n&quot;);
} }
int int
main(int argc, char **argv) { main(int argc, char **argv) {
int i;
const char *params[16 + 1];
int nbparams = 0;
xsltStylesheetPtr cur = NULL; xsltStylesheetPtr cur = NULL;
xmlDocPtr doc, res; xmlDocPtr doc, res;
@ -341,11 +376,33 @@ main(int argc, char **argv) {
return(1); return(1);
} }
for (i = 1; i &lt; argc; i++) {
if (argv[i][0] != '-')
break;
if ((!strcmp(argv[i], &quot;-param&quot;)) ||
(!strcmp(argv[i], &quot;--param&quot;))) {
i++;
params[nbparams++] = argv[i++];
params[nbparams++] = argv[i];
if (nbparams &gt;= 16) {
fprintf(stderr, &quot;too many params\n&quot;);
return (1);
}
} else {
fprintf(stderr, &quot;Unknown option %s\n&quot;, argv[i]);
usage(argv[0]);
return (1);
}
}
params[nbparams] = NULL;
xmlSubstituteEntitiesDefault(1); xmlSubstituteEntitiesDefault(1);
xmlLoadExtDtdDefaultValue = 1; xmlLoadExtDtdDefaultValue = 1;
cur = xsltParseStylesheetFile((const xmlChar *)argv[1]); cur = xsltParseStylesheetFile((const xmlChar *)argv[i]);
doc = xmlParseFile(argv[2]); i++;
res = xsltApplyStylesheet(cur, doc, NULL); doc = xmlParseFile(argv[i]);
res = xsltApplyStylesheet(cur, doc, params);
xsltSaveResultToFile(stdout, res, cur); xsltSaveResultToFile(stdout, res, cur);
xsltFreeStylesheet(cur); xsltFreeStylesheet(cur);

49
doc/tutorial/libxslttutorial.xml
View File

@ -26,7 +26,7 @@
<surname>Fleck</surname> <surname>Fleck</surname>
</author> </author>
<releaseinfo> <releaseinfo>
This is version 0.2 of the libxslt Tutorial This is version 0.3 of the libxslt Tutorial
</releaseinfo> </releaseinfo>
</articleinfo> </articleinfo>
<abstract> <abstract>
@ -136,7 +136,7 @@
<para>Second, set <varname>xmlLoadExtDtdDefaultValue</varname> equal to <para>Second, set <varname>xmlLoadExtDtdDefaultValue</varname> equal to
<parameter>1</parameter>. This tells <application>libxml</application> <parameter>1</parameter>. This tells <application>libxml</application>
to load external entity subsets. If you do not do this and the file your to load external entity subsets. If you do not do this and your
input file includes entities through external subsets, you will get input file includes entities through external subsets, you will get
errors.</para> errors.</para>
</sect2> </sect2>
@ -145,7 +145,7 @@
<para>Parsing the stylesheet takes a single function call, which takes a <para>Parsing the stylesheet takes a single function call, which takes a
variable of type <type>xmlChar</type>: variable of type <type>xmlChar</type>:
<programlisting> <programlisting>
<varname>cur</varname> = xsltParseStylesheetFile((const xmlChar *)argv[1]); <varname>cur</varname> = xsltParseStylesheetFile((const xmlChar *)argv[i]);
</programlisting> </programlisting>
In this case, I cast the stylesheet file name, passed in as a In this case, I cast the stylesheet file name, passed in as a
command line argument, to <emphasis>xmlChar</emphasis>. The return value command line argument, to <emphasis>xmlChar</emphasis>. The return value
@ -160,7 +160,7 @@
<title>Parse the Input File</title> <title>Parse the Input File</title>
<para>Parsing the input file takes a single function call: <para>Parsing the input file takes a single function call:
<programlisting> <programlisting>
doc = xmlParseFile(argv[2]); doc = xmlParseFile(argv[i]);
</programlisting> </programlisting>
It returns an <emphasis>xmlDocPtr</emphasis>, a struct in memory that It returns an <emphasis>xmlDocPtr</emphasis>, a struct in memory that
contains the document tree. It can be manipulated directly, but for this contains the document tree. It can be manipulated directly, but for this
@ -174,13 +174,13 @@ doc = xmlParseFile(argv[2]);
in memory, apply the stylesheet to the document. The in memory, apply the stylesheet to the document. The
function that does this is <function>xsltApplyStylesheet</function>: function that does this is <function>xsltApplyStylesheet</function>:
<programlisting> <programlisting>
res = xsltApplyStylesheet(cur, doc, NULL); res = xsltApplyStylesheet(cur, doc, params);
</programlisting> </programlisting>
For parameters, the function takes an xsltStylesheetPtr and an The function takes an xsltStylesheetPtr and an
xmlDocPtr, the values returned by the previous two functions. The third xmlDocPtr, the values returned by the previous two functions. The third
parameter, NULL in this case, can be used to pass parameters to the variable, <varname>params</varname> can be used to pass
stylesheet. It is a NULL-terminated array of name/value pairs of const <acronym>XSLT</acronym> parameters to the stylesheet. It is a
char's. NULL-terminated array of name/value pairs of const char's.
</para> </para>
</sect2> </sect2>
@ -206,6 +206,37 @@ xsltSaveResultToFile(stdout, res, cur);
</para> </para>
</sect2> </sect2>
<sect2 id="parameters">
<title>Parameters</title>
<para>
In <acronym>XSLT</acronym>, parameters may be used as a way to pass
additional information to a
stylesheet. <application>libxslt</application> accepts
<acronym>XSLT</acronym> parameters as one of the values passed to
<function>xsltApplyStylesheet</function>.
</para>
<para>
In the tutorial example and in <application>xsltproc</application>,
on which the tutorial example is based, parameters to be passed take the
form of key-value pairs. The program collects them from command line
arguments, inserting them in the array <varname>params</varname>, then
passes them to the function. The final element in the array is set to
<parameter>NULL</parameter>.
<note>
<para>
If a parameter being passed is a string rather than an
<acronym>XSLT</acronym> node, it must be escaped. For the tutorial
program, that would be done as follows:
<command>tutorial]$ ./libxslt_tutorial --param rootid "'asect1'"
stylesheet.xsl filename.xml</command>
</para>
</note>
</para>
</sect2>
<sect2 id="cleanup"> <sect2 id="cleanup">
<title>Cleanup</title> <title>Cleanup</title>
<para>After you are finished, <application>libxslt</application> and <para>After you are finished, <application>libxslt</application> and