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Re: [xslt] xsltRegisterExtModule: initFunc not getting called

On Wed, Dec 18, 2002 at 06:49:48PM +1000, Hoylen Sue wrote:
> 
> > > I call xsltRegisterExtModule, passing it the module initialization
> > > function (which contains calls to xsltRegisterExtFunction). But that
> > > module initialization function never get called
> 
> >  unclear, I have a really hard time reading your code.
> 
> Sorry, that's probably due to all the error checking code (in C++).
> At the end of this mail is a cut down version without error checking.
> 
> > This might be a bug in libxslt or in your code, nothing obvious,
> > the best is to take a debugger and step through it to see what's
> > happening when running the transformation.
> 
> Ok. Using a debugger can be my next approach.
> 
> However, I'm having second thoughts am am thinking of registering
> the external XPath functions using xsltRegisterExtModuleFunction
> (instead of using xsltRegisterExtModule and registering the XPath
> functions from within the module initialization function).  Mainly
> because for the module to be initialized, the stylesheet would
> have to use the extension-element-prefixes attribute in the
> stylesheet element.  Since I'm only defining external functions,
> and not external elements, there is nothing in XSLT per se that
> would require the stylesheet writer to use that attribute.

??? Correct me if i'm wrong, but you have to to use that 
for functions anyway, or? I never got it to work without
(but haven't tried lately).
Daniel, i recall having the same problems with 'xsltRegisterExtModule',
i didn't have the time to debug it right then so i registered my
functions with 'xsltRegisterExtModuleFunction()'.

Ralf Mattes

> Thanks.
> 
> Hoylen
> 
> 
> 
> 
> #include <stdio.h>
> 
> #include <libxml/xpathInternals.h>
> #include <libxslt/xsltconfig.h>
> #include <libxslt/extensions.h>
> #include <libxslt/transform.h>
> 
> static const char* NAMESPACE = "http://www.example.com/test";;
> 
> //----------------------------------------------------------------
> // The implementation of the XPath function
> 
> void
> xpath_function_hello (xmlXPathParserContextPtr ctxt, int nargs)
> {
>   CHECK_ARITY(0);
>   valuePush(ctxt, xmlXPathNewString(BAD_CAST "Hello world"));
> }
> 
> //----------------------------------------------------------------
> // Module initialization and termination functions
> 
> void*
> module_init(xsltTransformContextPtr xpath_ctxt,
>             const xmlChar* uri)
> {
>   printf("DEBUG: yippee! module_init called ************\n");
>   xsltRegisterExtFunction(xpath_ctxt, BAD_CAST "hello", uri,
> 			  xpath_function_hello);
>   return NULL;
> }
> 
> void
> module_term (xsltTransformContextPtr ctxt,
>            	const xmlChar *URI,
> 		void *data)
> {
>   // do nothing
> }
> 
> //================================================================
> 
> int
> main (int argc, char** argv)
> {
>   xsltStylesheet* stylesheet;
>   xmlDocPtr input;
>   xmlDocPtr result;
> 
> #if 0
>   /* If this is used, program works, but module_init still not called */
>   xsltRegisterExtModuleFunction(BAD_CAST "hello", BAD_CAST NAMESPACE,
> 				xpath_function_hello);
> #endif
> 
>   if (argc != 3) {
>     printf("Usage: %s xsltfile xmlfile\n", argv[0]);
>     return 1;
>   }
> 
>   xsltRegisterExtModule(BAD_CAST NAMESPACE, module_init, module_term);
> 
>   stylesheet = xsltParseStylesheetFile(BAD_CAST argv[1]);
>   input = xmlParseFile(argv[2]);
> 
>   result = xsltApplyStylesheet(stylesheet, input, NULL);
> 
>   xmlSaveFormatFile ("-", result, 1 /* indent */);
> 
>   xmlFreeDoc(input);
>   xsltFreeStylesheet(stylesheet);
>   return 0;
> }
> 
> //----------------------------------------------------------------
> //EOF
> 
> 
> Testing XSLT script:
> 
> <?xml version="1.0"?>
> 
> <xsl:stylesheet xmlns:xsl="http://www.w3.org/1999/XSL/Transform";
> 		xmlns:TEST="http://www.example.com/test";
> 		extension-element-prefixes="TEST"
> 		version="1.0">
> 
> <xsl:template match="story">
>   <html>
>     <head><title>Test</title></head>
>     <body>
>       <h1><xsl:value-of select="TEST:hello()"/></h1>
>       <xsl:apply-templates/>
>     </body>
>   </html>
> </xsl:template>
> 
> </xsl:stylesheet>
> 
> 
> 
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