third_party/libxslt/libxslt/functions.c

/* [<][>][^][v][top][bottom][index][help] */
This source file includes following definitions.
xsltXPathFunctionLookup
xsltDocumentFunctionLoadDocument
xsltDocumentFunction
xsltKeyFunction
xsltUnparsedEntityURIFunction
xsltFormatNumberFunction
xsltGenerateIdFunction
xsltSystemPropertyFunction
xsltElementAvailableFunction
xsltFunctionAvailableFunction
xsltCurrentFunction
xsltRegisterAllFunctions
/*
 * 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

/**
 * xsltXPathFunctionLookup:
 * @ctxt:  a void * but the XSLT transformation context actually
 * @name:  the function name
 * @ns_uri:  the function namespace URI
 *
 * This is the entry point when a function is needed by the XPath
 * interpretor.
 *
 * Returns the callback function or NULL if not found
 */
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));
}

/**
 * xsltDocumentFunction:
 * @ctxt:  the XPath Parser context
 * @nargs:  the number of arguments
 *
 * Implement the document() XSLT function
 *   node-set document(object, node-set?)
 */
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);
}

/**
 * xsltKeyFunction:
 * @ctxt:  the XPath Parser context
 * @nargs:  the number of arguments
 *
 * Implement the key() XSLT function
 *   node-set key(string, object)
 */
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);    
}

/**
 * xsltUnparsedEntityURIFunction:
 * @ctxt:  the XPath Parser context
 * @nargs:  the number of arguments
 *
 * Implement the unparsed-entity-uri() XSLT function
 *   string unparsed-entity-uri(string)
 */
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);
}

/**
 * xsltFormatNumberFunction:
 * @ctxt:  the XPath Parser context
 * @nargs:  the number of arguments
 *
 * Implement the format-number() XSLT function
 *   string format-number(number, string, string?)
 */
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);
}

/**
 * xsltGenerateIdFunction:
 * @ctxt:  the XPath Parser context
 * @nargs:  the number of arguments
 *
 * Implement the generate-id() XSLT function
 *   string generate-id(node-set?)
 */
void
xsltGenerateIdFunction(xmlXPathParserContextPtr ctxt, int nargs){
    xmlNodePtr cur = NULL;
    xmlXPathObjectPtr obj = NULL;
    long val;
    xmlChar str[30];
    xmlDocPtr doc;

    if (nargs == 0) {
        cur = ctxt->context->node;
    } else if (nargs == 1) {
        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];
        }
    } 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
     */
    if (cur->type != XML_NAMESPACE_DECL)
        doc = cur->doc;
    else {
        xmlNsPtr ns = (xmlNsPtr) cur;

        if (ns->context != NULL)
            doc = ns->context;
        else
            doc = ctxt->context->doc;

    }

    if (obj)
        xmlXPathFreeObject(obj);

    val = (long)((char *)cur - (char *)doc);
    if (val >= 0) {
      sprintf((char *)str, "idp%ld", val);
    } else {
      sprintf((char *)str, "idm%ld", -val);
    }
    valuePush(ctxt, xmlXPathNewString(str));
}

/**
 * xsltSystemPropertyFunction:
 * @ctxt:  the XPath Parser context
 * @nargs:  the number of arguments
 *
 * Implement the system-property() XSLT function
 *   object system-property(string)
 */
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);
}

/**
 * xsltElementAvailableFunction:
 * @ctxt:  the XPath Parser context
 * @nargs:  the number of arguments
 *
 * Implement the element-available() XSLT function
 *   boolean element-available(string)
 */
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);
}

/**
 * xsltFunctionAvailableFunction:
 * @ctxt:  the XPath Parser context
 * @nargs:  the number of arguments
 *
 * Implement the function-available() XSLT function
 *   boolean function-available(string)
 */
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);
}

/**
 * xsltCurrentFunction:
 * @ctxt:  the XPath Parser context
 * @nargs:  the number of arguments
 *
 * Implement the current() XSLT function
 *   node-set current()
 */
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              *
 *                                                                      *
 ************************************************************************/

/**
 * xsltRegisterAllFunctions:
 * @ctxt:  the XPath context
 *
 * Registers all default XSLT functions in this context
 */
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);
}
/* [<][>][^][v][top][bottom][index][help] */
root/third_party/libxslt/libxslt/functions.c

DEFINITIONS
