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/*
* dynamic.c: Implementation of the EXSLT -- Dynamic module
*
* References:
* http://www.exslt.org/dyn/dyn.html
*
* See Copyright for the status of this software.
*
* Authors:
* Mark Vakoc <mark_vakoc@jdedwards.com>
* Thomas Broyer <tbroyer@ltgt.net>
*
* TODO:
* elements:
* functions:
* min
* max
* sum
* map
* closure
*/
#define IN_LIBEXSLT
#include "libexslt/libexslt.h"
#if defined(WIN32) && !defined (__CYGWIN__)
#include <win32config.h>
#else
#include "config.h"
#endif
#include <libxml/tree.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
#include <libxslt/xsltconfig.h>
#include <libxslt/xsltutils.h>
#include <libxslt/xsltInternals.h>
#include <libxslt/extensions.h>
#include "exslt.h"
/**
* exsltDynEvaluateFunction:
* @ctxt: an XPath parser context
* @nargs: the number of arguments
*
* Evaluates the string as an XPath expression and returns the result
* value, which may be a boolean, number, string, node set, result tree
* fragment or external object.
*/
void
exsltDynEvaluateFunction(xmlXPathParserContextPtr ctxt, int nargs) {
xmlChar *str = NULL;
xmlXPathObjectPtr ret = NULL;
if (ctxt == NULL)
return;
if (nargs != 1) {
xsltPrintErrorContext(xsltXPathGetTransformContext(ctxt), NULL, NULL);
xsltGenericError(xsltGenericErrorContext,
"dyn:evalute() : invalid number of args %d\n", nargs);
ctxt->error = XPATH_INVALID_ARITY;
return;
}
str = xmlXPathPopString(ctxt);
/* return an empty node-set if an empty string is passed in */
if (!str||!xmlStrlen(str)) {
if (str) xmlFree(str);
valuePush(ctxt,xmlXPathNewNodeSet(NULL));
return;
}
ret = xmlXPathEval(str,ctxt->context);
if (ret)
valuePush(ctxt,ret);
else {
xsltGenericError(xsltGenericErrorContext,
"dyn:evaluate() : unable to evaluate expression '%s'\n",str);
valuePush(ctxt,xmlXPathNewNodeSet(NULL));
}
xmlFree(str);
return;
}
/**
* exsltDynRegister:
*
* Registers the EXSLT - Dynamic module
*/
void
exsltDynRegister (void) {
xsltRegisterExtModuleFunction ((const xmlChar *) "evaluate",
EXSLT_DYNAMIC_NAMESPACE,
exsltDynEvaluateFunction);
}
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