functions.c

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/*
 * functions.c: Implementation of the XSLT extra functions
 *
 * Reference:
 *   http://www.w3.org/TR/1999/REC-xslt-19991116
 *
 * See Copyright for the status of this software.
 *
 * daniel@veillard.com
 * Bjorn Reese <breese@users.sourceforge.net> for number formatting
 */

#define IN_LIBXSLT
#include "libxslt.h"

#include <string.h>

#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_CTYPE_H
#include <ctype.h>
#endif

#include <libxml/xmlmemory.h>
#include <libxml/parser.h>
#include <libxml/tree.h>
#include <libxml/valid.h>
#include <libxml/hash.h>
#include <libxml/xmlerror.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
#include <libxml/parserInternals.h>
#include <libxml/uri.h>
#include <libxml/xpointer.h>
#include "xslt.h"
#include "xsltInternals.h"
#include "xsltutils.h"
#include "functions.h"
#include "extensions.h"
#include "numbersInternals.h"
#include "keys.h"
#include "documents.h"

#ifdef WITH_XSLT_DEBUG
#define WITH_XSLT_DEBUG_FUNCTION
#endif

/*
 * Some versions of DocBook XSL use the vendor string to detect
 * supporting chunking, this is a workaround to be considered
 * in the list of decent XSLT processors <grin/>
 */
#define DOCBOOK_XSL_HACK

xmlXPathFunction
xsltXPathFunctionLookup (xmlXPathContextPtr ctxt,
             const xmlChar *name, const xmlChar *ns_uri) {
    xmlXPathFunction ret;

    if ((ctxt == NULL) || (name == NULL) || (ns_uri == NULL))
    return (NULL);

#ifdef WITH_XSLT_DEBUG_FUNCTION
    xsltGenericDebug(xsltGenericDebugContext,
            "Lookup function {%s}%s\n", ns_uri, name);
#endif

    /* give priority to context-level functions */
    /*
    ret = (xmlXPathFunction) xmlHashLookup2(ctxt->funcHash, name, ns_uri);
    */
    XML_CAST_FPTR(ret) = xmlHashLookup2(ctxt->funcHash, name, ns_uri);

    if (ret == NULL)
    ret = xsltExtModuleFunctionLookup(name, ns_uri);

#ifdef WITH_XSLT_DEBUG_FUNCTION
    if (ret != NULL)
        xsltGenericDebug(xsltGenericDebugContext,
            "found function %s\n", name);
#endif
    return(ret);
}


/************************************************************************
 *                                  *
 *          Module interfaces               *
 *                                  *
 ************************************************************************/

static void
xsltDocumentFunctionLoadDocument(xmlXPathParserContextPtr ctxt, xmlChar* URI)
{
    xsltTransformContextPtr tctxt;
    xmlURIPtr uri;
    xmlChar *fragment;
    xsltDocumentPtr idoc; /* document info */
    xmlDocPtr doc;
    xmlXPathContextPtr xptrctxt = NULL;
    xmlXPathObjectPtr resObj = NULL;

    tctxt = xsltXPathGetTransformContext(ctxt);
    if (tctxt == NULL) {
    xsltTransformError(NULL, NULL, NULL,
        "document() : internal error tctxt == NULL\n");
    valuePush(ctxt, xmlXPathNewNodeSet(NULL));
    return;
    } 
    
    uri = xmlParseURI((const char *) URI);
    if (uri == NULL) {
    xsltTransformError(tctxt, NULL, NULL,
        "document() : failed to parse URI\n");
    valuePush(ctxt, xmlXPathNewNodeSet(NULL));
    return;
    } 
    
    /*
     * check for and remove fragment identifier
     */
    fragment = (xmlChar *)uri->fragment;
    if (fragment != NULL) {
        xmlChar *newURI;
    uri->fragment = NULL;
    newURI = xmlSaveUri(uri);
    idoc = xsltLoadDocument(tctxt, newURI);
    xmlFree(newURI);
    } else
    idoc = xsltLoadDocument(tctxt, URI);
    xmlFreeURI(uri);
    
    if (idoc == NULL) {
    if ((URI == NULL) ||
        (URI[0] == '#') ||
        ((tctxt->style->doc != NULL) &&
        (xmlStrEqual(tctxt->style->doc->URL, URI)))) 
    {
        /*
        * This selects the stylesheet's doc itself.
        */
        doc = tctxt->style->doc;
    } else {
        valuePush(ctxt, xmlXPathNewNodeSet(NULL));

        if (fragment != NULL)
        xmlFree(fragment);

        return;
    }
    } else
    doc = idoc->doc;

    if (fragment == NULL) {
    valuePush(ctxt, xmlXPathNewNodeSet((xmlNodePtr) doc));
    return;
    }
    
    /* use XPointer of HTML location for fragment ID */
#ifdef LIBXML_XPTR_ENABLED
    xptrctxt = xmlXPtrNewContext(doc, NULL, NULL);
    if (xptrctxt == NULL) {
    xsltTransformError(tctxt, NULL, NULL,
        "document() : internal error xptrctxt == NULL\n");
    goto out_fragment;
    }

    resObj = xmlXPtrEval(fragment, xptrctxt);
    xmlXPathFreeContext(xptrctxt);
#endif
    xmlFree(fragment);  

    if (resObj == NULL)
    goto out_fragment;
    
    switch (resObj->type) {
    case XPATH_NODESET:
        break;
    case XPATH_UNDEFINED:
    case XPATH_BOOLEAN:
    case XPATH_NUMBER:
    case XPATH_STRING:
    case XPATH_POINT:
    case XPATH_USERS:
    case XPATH_XSLT_TREE:
    case XPATH_RANGE:
    case XPATH_LOCATIONSET:
        xsltTransformError(tctxt, NULL, NULL,
        "document() : XPointer does not select a node set: #%s\n", 
        fragment);
    goto out_object;
    }
    
    valuePush(ctxt, resObj);
    return;

out_object:
    xmlXPathFreeObject(resObj);

out_fragment:
    valuePush(ctxt, xmlXPathNewNodeSet(NULL));
}

void
xsltDocumentFunction(xmlXPathParserContextPtr ctxt, int nargs)
{
    xmlXPathObjectPtr obj, obj2 = NULL;
    xmlChar *base = NULL, *URI;


    if ((nargs < 1) || (nargs > 2)) {
        xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
                         "document() : invalid number of args %d\n",
                         nargs);
        ctxt->error = XPATH_INVALID_ARITY;
        return;
    }
    if (ctxt->value == NULL) {
        xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
                         "document() : invalid arg value\n");
        ctxt->error = XPATH_INVALID_TYPE;
        return;
    }

    if (nargs == 2) {
        if (ctxt->value->type != XPATH_NODESET) {
            xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
                             "document() : invalid arg expecting a nodeset\n");
            ctxt->error = XPATH_INVALID_TYPE;
            return;
        }

        obj2 = valuePop(ctxt);
    }

    if (ctxt->value->type == XPATH_NODESET) {
        int i;
        xmlXPathObjectPtr newobj, ret;

        obj = valuePop(ctxt);
        ret = xmlXPathNewNodeSet(NULL);

        if (obj->nodesetval) {
            for (i = 0; i < obj->nodesetval->nodeNr; i++) {
                valuePush(ctxt,
                          xmlXPathNewNodeSet(obj->nodesetval->nodeTab[i]));
                xmlXPathStringFunction(ctxt, 1);
                if (nargs == 2) {
                    valuePush(ctxt, xmlXPathObjectCopy(obj2));
                } else {
                    valuePush(ctxt,
                              xmlXPathNewNodeSet(obj->nodesetval->
                                                 nodeTab[i]));
                }
                xsltDocumentFunction(ctxt, 2);
                newobj = valuePop(ctxt);
                ret->nodesetval = xmlXPathNodeSetMerge(ret->nodesetval,
                                                       newobj->nodesetval);
                xmlXPathFreeObject(newobj);
            }
        }

        xmlXPathFreeObject(obj);
        if (obj2 != NULL)
            xmlXPathFreeObject(obj2);
        valuePush(ctxt, ret);
        return;
    }
    /*
     * Make sure it's converted to a string
     */
    xmlXPathStringFunction(ctxt, 1);
    if (ctxt->value->type != XPATH_STRING) {
        xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
                         "document() : invalid arg expecting a string\n");
        ctxt->error = XPATH_INVALID_TYPE;
        if (obj2 != NULL)
            xmlXPathFreeObject(obj2);
        return;
    }
    obj = valuePop(ctxt);
    if (obj->stringval == NULL) {
        valuePush(ctxt, xmlXPathNewNodeSet(NULL));
    } else {
        if ((obj2 != NULL) && (obj2->nodesetval != NULL) &&
            (obj2->nodesetval->nodeNr > 0) &&
            IS_XSLT_REAL_NODE(obj2->nodesetval->nodeTab[0])) {
            xmlNodePtr target;

            target = obj2->nodesetval->nodeTab[0];
            if ((target->type == XML_ATTRIBUTE_NODE) ||
            (target->type == XML_PI_NODE)) {
                target = ((xmlAttrPtr) target)->parent;
            }
            base = xmlNodeGetBase(target->doc, target);
        } else {
            xsltTransformContextPtr tctxt;

            tctxt = xsltXPathGetTransformContext(ctxt);
            if ((tctxt != NULL) && (tctxt->inst != NULL)) {
                base = xmlNodeGetBase(tctxt->inst->doc, tctxt->inst);
            } else if ((tctxt != NULL) && (tctxt->style != NULL) &&
                       (tctxt->style->doc != NULL)) {
                base = xmlNodeGetBase(tctxt->style->doc,
                                      (xmlNodePtr) tctxt->style->doc);
            }
        }
        URI = xmlBuildURI(obj->stringval, base);
        if (base != NULL)
            xmlFree(base);
        if (URI == NULL) {
            valuePush(ctxt, xmlXPathNewNodeSet(NULL));
        } else {
        xsltDocumentFunctionLoadDocument( ctxt, URI );
        xmlFree(URI);
    }
    }
    xmlXPathFreeObject(obj);
    if (obj2 != NULL)
        xmlXPathFreeObject(obj2);
}

void
xsltKeyFunction(xmlXPathParserContextPtr ctxt, int nargs){    
    xmlXPathObjectPtr obj1, obj2;    
    
    if (nargs != 2) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "key() : expects two arguments\n");
    ctxt->error = XPATH_INVALID_ARITY;
    return;
    }    

    /*
    * Get the key's value.
    */
    obj2 = valuePop(ctxt);
    xmlXPathStringFunction(ctxt, 1);
    if ((obj2 == NULL) ||
    (ctxt->value == NULL) || (ctxt->value->type != XPATH_STRING)) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "key() : invalid arg expecting a string\n");
    ctxt->error = XPATH_INVALID_TYPE;
    xmlXPathFreeObject(obj2);

    return;
    }
    /*
    * Get the key's name.
    */
    obj1 = valuePop(ctxt);    

    if ((obj2->type == XPATH_NODESET) || (obj2->type == XPATH_XSLT_TREE)) {
    int i;
    xmlXPathObjectPtr newobj, ret;

    ret = xmlXPathNewNodeSet(NULL);

    if (obj2->nodesetval != NULL) {
        for (i = 0; i < obj2->nodesetval->nodeNr; i++) {
        valuePush(ctxt, xmlXPathObjectCopy(obj1));
        valuePush(ctxt,
              xmlXPathNewNodeSet(obj2->nodesetval->nodeTab[i]));
        xmlXPathStringFunction(ctxt, 1);
        xsltKeyFunction(ctxt, 2);
        newobj = valuePop(ctxt);
        ret->nodesetval = xmlXPathNodeSetMerge(ret->nodesetval,
                               newobj->nodesetval);
        xmlXPathFreeObject(newobj);
        }
    }
    valuePush(ctxt, ret);
    } else {
    xmlNodeSetPtr nodelist = NULL;
    xmlChar *key = NULL, *value;
    const xmlChar *keyURI;
    xsltTransformContextPtr tctxt;   
    xmlChar *qname, *prefix;
    xmlXPathContextPtr xpctxt = ctxt->context;
    xmlNodePtr tmpNode = NULL;
    xsltDocumentPtr oldDocInfo;

    tctxt = xsltXPathGetTransformContext(ctxt);

    oldDocInfo = tctxt->document;

    if (xpctxt->node == NULL) {
        xsltTransformError(tctxt, NULL, tctxt->inst,
        "Internal error in xsltKeyFunction(): "
        "The context node is not set on the XPath context.\n");
        tctxt->state = XSLT_STATE_STOPPED;
        goto error;
    }   
    /*
     * Get the associated namespace URI if qualified name
     */
    qname = obj1->stringval;
    key = xmlSplitQName2(qname, &prefix);
    if (key == NULL) {
        key = xmlStrdup(obj1->stringval);
        keyURI = NULL;
        if (prefix != NULL)
        xmlFree(prefix);
    } else {
        if (prefix != NULL) {
        keyURI = xmlXPathNsLookup(xpctxt, prefix);
        if (keyURI == NULL) {
            xsltTransformError(tctxt, NULL, tctxt->inst,
            "key() : prefix %s is not bound\n", prefix);
            /*
            * TODO: Shouldn't we stop here?
            */
        }
        xmlFree(prefix);
        } else {
        keyURI = NULL;
        }
    }

    /*
     * Force conversion of first arg to string
     */
    valuePush(ctxt, obj2);
    xmlXPathStringFunction(ctxt, 1);
    if ((ctxt->value == NULL) || (ctxt->value->type != XPATH_STRING)) {
        xsltTransformError(tctxt, NULL, tctxt->inst,
        "key() : invalid arg expecting a string\n");
        ctxt->error = XPATH_INVALID_TYPE;
        goto error;
    }
    obj2 = valuePop(ctxt);
    value = obj2->stringval;
    
    /*
    * We need to ensure that ctxt->document is available for
    * xsltGetKey().
    * First find the relevant doc, which is the context node's
    * owner doc; using context->doc is not safe, since
    * the doc could have been acquired via the document() function,
    * or the doc might be a Result Tree Fragment.
    * FUTURE INFO: In XSLT 2.0 the key() function takes an additional
    * argument indicating the doc to use.
    */  
    if (xpctxt->node->type == XML_NAMESPACE_DECL) {
        /*
        * REVISIT: This is a libxml hack! Check xpath.c for details.
        * The XPath module sets the owner element of a ns-node on
        * the ns->next field.
        */
        if ((((xmlNsPtr) xpctxt->node)->next != NULL) &&
        (((xmlNsPtr) xpctxt->node)->next->type == XML_ELEMENT_NODE))
        {
        tmpNode = (xmlNodePtr) ((xmlNsPtr) xpctxt->node)->next;
        }
    } else
        tmpNode = xpctxt->node;

    if ((tmpNode == NULL) || (tmpNode->doc == NULL)) {
        xsltTransformError(tctxt, NULL, tctxt->inst,
        "Internal error in xsltKeyFunction(): "
        "Couldn't get the doc of the XPath context node.\n");
        goto error;
    }

    if ((tctxt->document == NULL) ||
        (tctxt->document->doc != tmpNode->doc))
    {      
        if (tmpNode->doc->name && (tmpNode->doc->name[0] == ' ')) {
        /*
        * This is a Result Tree Fragment.
        */
        if (tmpNode->doc->_private == NULL) {
            tmpNode->doc->_private = xsltNewDocument(tctxt, tmpNode->doc);
            if (tmpNode->doc->_private == NULL)
            goto error;
        }
        tctxt->document = (xsltDocumentPtr) tmpNode->doc->_private;     
        } else {
        /*
        * May be the initial source doc or a doc acquired via the
        * document() function.
        */
        tctxt->document = xsltFindDocument(tctxt, tmpNode->doc);
        }
        if (tctxt->document == NULL) {
        xsltTransformError(tctxt, NULL, tctxt->inst,
            "Internal error in xsltKeyFunction(): "
            "Could not get the document info of a context doc.\n");
        tctxt->state = XSLT_STATE_STOPPED;
        goto error;
        }
    }
    /*
    * Get/compute the key value.
    */
    nodelist = xsltGetKey(tctxt, key, keyURI, value);

error:  
    tctxt->document = oldDocInfo;
    valuePush(ctxt, xmlXPathWrapNodeSet(
        xmlXPathNodeSetMerge(NULL, nodelist)));
    if (key != NULL)
        xmlFree(key);
    }    

    if (obj1 != NULL)
    xmlXPathFreeObject(obj1);
    if (obj2 != NULL)
    xmlXPathFreeObject(obj2);    
}

void
xsltUnparsedEntityURIFunction(xmlXPathParserContextPtr ctxt, int nargs){
    xmlXPathObjectPtr obj;
    xmlChar *str;

    if ((nargs != 1) || (ctxt->value == NULL)) {
        xsltGenericError(xsltGenericErrorContext,
        "unparsed-entity-uri() : expects one string arg\n");
    ctxt->error = XPATH_INVALID_ARITY;
    return;
    }
    obj = valuePop(ctxt);
    if (obj->type != XPATH_STRING) {
    obj = xmlXPathConvertString(obj);
    }

    str = obj->stringval;
    if (str == NULL) {
    valuePush(ctxt, xmlXPathNewString((const xmlChar *)""));
    } else {
    xmlEntityPtr entity;

    entity = xmlGetDocEntity(ctxt->context->doc, str);
    if (entity == NULL) {
        valuePush(ctxt, xmlXPathNewString((const xmlChar *)""));
    } else {
        if (entity->URI != NULL)
        valuePush(ctxt, xmlXPathNewString(entity->URI));
        else
        valuePush(ctxt, xmlXPathNewString((const xmlChar *)""));
    }
    }
    xmlXPathFreeObject(obj);
}

void
xsltFormatNumberFunction(xmlXPathParserContextPtr ctxt, int nargs)
{
    xmlXPathObjectPtr numberObj = NULL;
    xmlXPathObjectPtr formatObj = NULL;
    xmlXPathObjectPtr decimalObj = NULL;
    xsltStylesheetPtr sheet;
    xsltDecimalFormatPtr formatValues;
    xmlChar *result;
    xsltTransformContextPtr tctxt;

    tctxt = xsltXPathGetTransformContext(ctxt);
    if (tctxt == NULL)
    return;
    sheet = tctxt->style;
    if (sheet == NULL)
    return;
    formatValues = sheet->decimalFormat;
    
    switch (nargs) {
    case 3:
    CAST_TO_STRING;
    decimalObj = valuePop(ctxt);
    formatValues = xsltDecimalFormatGetByName(sheet, decimalObj->stringval);
    if (formatValues == NULL) {
        xsltTransformError(tctxt, NULL, NULL,
            "format-number() : undeclared decimal format '%s'\n", 
            decimalObj->stringval);
    }
    /* Intentional fall-through */
    case 2:
    CAST_TO_STRING;
    formatObj = valuePop(ctxt);
    CAST_TO_NUMBER;
    numberObj = valuePop(ctxt);
    break;
    default:
    XP_ERROR(XPATH_INVALID_ARITY);
    }

    if (formatValues != NULL) {
    if (xsltFormatNumberConversion(formatValues,
                       formatObj->stringval,
                       numberObj->floatval,
                       &result) == XPATH_EXPRESSION_OK) {
        valuePush(ctxt, xmlXPathNewString(result));
        xmlFree(result);
    }
    }

    xmlXPathFreeObject(numberObj);
    xmlXPathFreeObject(formatObj);
    xmlXPathFreeObject(decimalObj);
}

void
xsltGenerateIdFunction(xmlXPathParserContextPtr ctxt, int nargs){
    xmlNodePtr cur = NULL;
    unsigned long val;
    xmlChar str[20];

    if (nargs == 0) {
    cur = ctxt->context->node;
    } else if (nargs == 1) {
    xmlXPathObjectPtr obj;
    xmlNodeSetPtr nodelist;
    int i, ret;

    if ((ctxt->value == NULL) || (ctxt->value->type != XPATH_NODESET)) {
        ctxt->error = XPATH_INVALID_TYPE;
        xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "generate-id() : invalid arg expecting a node-set\n");
        return;
    }
    obj = valuePop(ctxt);
    nodelist = obj->nodesetval;
    if ((nodelist == NULL) || (nodelist->nodeNr <= 0)) {
        xmlXPathFreeObject(obj);
        valuePush(ctxt, xmlXPathNewCString(""));
        return;
    }
    cur = nodelist->nodeTab[0];
    for (i = 1;i < nodelist->nodeNr;i++) {
        ret = xmlXPathCmpNodes(cur, nodelist->nodeTab[i]);
        if (ret == -1)
            cur = nodelist->nodeTab[i];
    }
    xmlXPathFreeObject(obj);
    } else {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "generate-id() : invalid number of args %d\n", nargs);
    ctxt->error = XPATH_INVALID_ARITY;
    return;
    }
    /*
     * Okay this is ugly but should work, use the NodePtr address
     * to forge the ID
     */
    val = (unsigned long)((char *)cur - (char *)0);
    val /= sizeof(xmlNode);
    sprintf((char *)str, "id%ld", val);
    valuePush(ctxt, xmlXPathNewString(str));
}

void
xsltSystemPropertyFunction(xmlXPathParserContextPtr ctxt, int nargs){
    xmlXPathObjectPtr obj;
    xmlChar *prefix, *name;
    const xmlChar *nsURI = NULL;

    if (nargs != 1) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "system-property() : expects one string arg\n");
    ctxt->error = XPATH_INVALID_ARITY;
    return;
    }
    if ((ctxt->value == NULL) || (ctxt->value->type != XPATH_STRING)) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "system-property() : invalid arg expecting a string\n");
    ctxt->error = XPATH_INVALID_TYPE;
    return;
    }
    obj = valuePop(ctxt);
    if (obj->stringval == NULL) {
    valuePush(ctxt, xmlXPathNewString((const xmlChar *)""));
    } else {
    name = xmlSplitQName2(obj->stringval, &prefix);
    if (name == NULL) {
        name = xmlStrdup(obj->stringval);
    } else {
        nsURI = xmlXPathNsLookup(ctxt->context, prefix);
        if (nsURI == NULL) {
        xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
            "system-property() : prefix %s is not bound\n", prefix);
        }
    }

    if (xmlStrEqual(nsURI, XSLT_NAMESPACE)) {
#ifdef DOCBOOK_XSL_HACK
        if (xmlStrEqual(name, (const xmlChar *)"vendor")) {
        xsltStylesheetPtr sheet;
        xsltTransformContextPtr tctxt;

        tctxt = xsltXPathGetTransformContext(ctxt);
        if ((tctxt != NULL) && (tctxt->inst != NULL) &&
            (xmlStrEqual(tctxt->inst->name, BAD_CAST "variable")) &&
            (tctxt->inst->parent != NULL) &&
            (xmlStrEqual(tctxt->inst->parent->name,
                 BAD_CAST "template")))
            sheet = tctxt->style;
        else
            sheet = NULL;
        if ((sheet != NULL) && (sheet->doc != NULL) &&
            (sheet->doc->URL != NULL) &&
            (xmlStrstr(sheet->doc->URL,
                   (const xmlChar *)"chunk") != NULL)) {
            valuePush(ctxt, xmlXPathNewString(
            (const xmlChar *)"libxslt (SAXON 6.2 compatible)"));

        } else {
            valuePush(ctxt, xmlXPathNewString(
            (const xmlChar *)XSLT_DEFAULT_VENDOR));
        }
        } else
#else
        if (xmlStrEqual(name, (const xmlChar *)"vendor")) {
        valuePush(ctxt, xmlXPathNewString(
              (const xmlChar *)XSLT_DEFAULT_VENDOR));
        } else
#endif
        if (xmlStrEqual(name, (const xmlChar *)"version")) {
        valuePush(ctxt, xmlXPathNewString(
            (const xmlChar *)XSLT_DEFAULT_VERSION));
        } else if (xmlStrEqual(name, (const xmlChar *)"vendor-url")) {
        valuePush(ctxt, xmlXPathNewString(
            (const xmlChar *)XSLT_DEFAULT_URL));
        } else {
        valuePush(ctxt, xmlXPathNewString((const xmlChar *)""));
        }
    }
    if (name != NULL)
        xmlFree(name);
    if (prefix != NULL)
        xmlFree(prefix);
    }
    xmlXPathFreeObject(obj);
}

void
xsltElementAvailableFunction(xmlXPathParserContextPtr ctxt, int nargs){
    xmlXPathObjectPtr obj;
    xmlChar *prefix, *name;
    const xmlChar *nsURI = NULL;
    xsltTransformContextPtr tctxt;

    if (nargs != 1) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "element-available() : expects one string arg\n");
    ctxt->error = XPATH_INVALID_ARITY;
    return;
    }
    xmlXPathStringFunction(ctxt, 1);
    if ((ctxt->value == NULL) || (ctxt->value->type != XPATH_STRING)) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "element-available() : invalid arg expecting a string\n");
    ctxt->error = XPATH_INVALID_TYPE;
    return;
    }
    obj = valuePop(ctxt);
    tctxt = xsltXPathGetTransformContext(ctxt);
    if (tctxt == NULL) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "element-available() : internal error tctxt == NULL\n");
    xmlXPathFreeObject(obj);
    valuePush(ctxt, xmlXPathNewBoolean(0));
    return;
    }


    name = xmlSplitQName2(obj->stringval, &prefix);
    if (name == NULL) {
    xmlNsPtr ns;

    name = xmlStrdup(obj->stringval);
    ns = xmlSearchNs(tctxt->inst->doc, tctxt->inst, NULL);
    if (ns != NULL) nsURI = xmlStrdup(ns->href);
    } else {
    nsURI = xmlXPathNsLookup(ctxt->context, prefix);
    if (nsURI == NULL) {
        xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "element-available() : prefix %s is not bound\n", prefix);
    }
    }

    if (xsltExtElementLookup(tctxt, name, nsURI) != NULL) {
    valuePush(ctxt, xmlXPathNewBoolean(1));
    } else {
    valuePush(ctxt, xmlXPathNewBoolean(0));
    }

    xmlXPathFreeObject(obj);
    if (name != NULL)
    xmlFree(name);
    if (prefix != NULL)
    xmlFree(prefix);
}

void
xsltFunctionAvailableFunction(xmlXPathParserContextPtr ctxt, int nargs){
    xmlXPathObjectPtr obj;
    xmlChar *prefix, *name;
    const xmlChar *nsURI = NULL;

    if (nargs != 1) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "function-available() : expects one string arg\n");
    ctxt->error = XPATH_INVALID_ARITY;
    return;
    }
    xmlXPathStringFunction(ctxt, 1);
    if ((ctxt->value == NULL) || (ctxt->value->type != XPATH_STRING)) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "function-available() : invalid arg expecting a string\n");
    ctxt->error = XPATH_INVALID_TYPE;
    return;
    }
    obj = valuePop(ctxt);

    name = xmlSplitQName2(obj->stringval, &prefix);
    if (name == NULL) {
    name = xmlStrdup(obj->stringval);
    } else {
    nsURI = xmlXPathNsLookup(ctxt->context, prefix);
    if (nsURI == NULL) {
        xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "function-available() : prefix %s is not bound\n", prefix);
    }
    }

    if (xmlXPathFunctionLookupNS(ctxt->context, name, nsURI) != NULL) {
    valuePush(ctxt, xmlXPathNewBoolean(1));
    } else {
    valuePush(ctxt, xmlXPathNewBoolean(0));
    }

    xmlXPathFreeObject(obj);
    if (name != NULL)
    xmlFree(name);
    if (prefix != NULL)
    xmlFree(prefix);
}

static void
xsltCurrentFunction(xmlXPathParserContextPtr ctxt, int nargs){
    xsltTransformContextPtr tctxt;

    if (nargs != 0) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "current() : function uses no argument\n");
    ctxt->error = XPATH_INVALID_ARITY;
    return;
    }
    tctxt = xsltXPathGetTransformContext(ctxt);
    if (tctxt == NULL) {
    xsltTransformError(xsltXPathGetTransformContext(ctxt), NULL, NULL,
        "current() : internal error tctxt == NULL\n");
    valuePush(ctxt, xmlXPathNewNodeSet(NULL));
    } else {
    valuePush(ctxt, xmlXPathNewNodeSet(tctxt->node)); /* current */
    }
}

/************************************************************************
 *                                  *
 *      Registration of XSLT and libxslt functions      *
 *                                  *
 ************************************************************************/

void
xsltRegisterAllFunctions(xmlXPathContextPtr ctxt)
{
    xmlXPathRegisterFunc(ctxt, (const xmlChar *) "current",
                         xsltCurrentFunction);
    xmlXPathRegisterFunc(ctxt, (const xmlChar *) "document",
                         xsltDocumentFunction);
    xmlXPathRegisterFunc(ctxt, (const xmlChar *) "key", xsltKeyFunction);
    xmlXPathRegisterFunc(ctxt, (const xmlChar *) "unparsed-entity-uri",
                         xsltUnparsedEntityURIFunction);
    xmlXPathRegisterFunc(ctxt, (const xmlChar *) "format-number",
                         xsltFormatNumberFunction);
    xmlXPathRegisterFunc(ctxt, (const xmlChar *) "generate-id",
                         xsltGenerateIdFunction);
    xmlXPathRegisterFunc(ctxt, (const xmlChar *) "system-property",
                         xsltSystemPropertyFunction);
    xmlXPathRegisterFunc(ctxt, (const xmlChar *) "element-available",
                         xsltElementAvailableFunction);
    xmlXPathRegisterFunc(ctxt, (const xmlChar *) "function-available",
                         xsltFunctionAvailableFunction);
}