third_party/libxslt/libxslt/variables.c

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This source file includes following definitions.
xsltCreateRVT
xsltRegisterTmpRVT
xsltRegisterLocalRVT
xsltExtensionInstructionResultFinalize
xsltExtensionInstructionResultRegister
xsltReleaseRVT
xsltRegisterPersistRVT
xsltFreeRVTs
xsltNewStackElem
xsltCopyStackElem
xsltFreeStackElem
xsltFreeStackElemList
xsltStackLookup
xsltCheckStackElem
xsltAddStackElem
xsltAddStackElemList
xsltEvalVariable
xsltEvalGlobalVariable
xsltEvalGlobalVariables
xsltRegisterGlobalVariable
xsltProcessUserParamInternal
xsltEvalUserParams
xsltQuoteUserParams
xsltEvalOneUserParam
xsltQuoteOneUserParam
xsltBuildVariable
xsltRegisterVariable
xsltGlobalVariableLookup
xsltVariableLookup
xsltParseStylesheetCallerParam
xsltParseGlobalVariable
xsltParseGlobalParam
xsltParseStylesheetVariable
xsltParseStylesheetParam
xsltFreeGlobalVariables
xsltXPathVariableLookup
/*
 * variables.c: Implementation of the variable storage and lookup
 *
 * Reference:
 *   http://www.w3.org/TR/1999/REC-xslt-19991116
 *
 * See Copyright for the status of this software.
 *
 * daniel@veillard.com
 */

#define IN_LIBXSLT
#include "libxslt.h"

#include <string.h>

#include <libxml/xmlmemory.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/dict.h>
#include "xslt.h"
#include "xsltInternals.h"
#include "xsltutils.h"
#include "variables.h"
#include "transform.h"
#include "imports.h"
#include "preproc.h"
#include "keys.h"

#ifdef WITH_XSLT_DEBUG
 #define WITH_XSLT_DEBUG_VARIABLE
#endif

#ifdef XSLT_REFACTORED
const xmlChar *xsltDocFragFake = (const xmlChar *) " fake node libxslt";
#endif

const xmlChar *xsltComputingGlobalVarMarker =
 (const xmlChar *) " var/param being computed";

#define XSLT_VAR_GLOBAL 1<<0
#define XSLT_VAR_IN_SELECT 1<<1
#define XSLT_TCTXT_VARIABLE(c) ((xsltStackElemPtr) (c)->contextVariable)

/************************************************************************
 *                                                                      *
 *  Result Value Tree (Result Tree Fragment) interfaces                 *
 *                                                                      *
 ************************************************************************/
/**
 * xsltCreateRVT:
 * @ctxt:  an XSLT transformation context
 *
 * Creates a Result Value Tree
 * (the XSLT 1.0 term for this is "Result Tree Fragment") 
 *
 * Returns the result value tree or NULL in case of API or internal errors.
 */
xmlDocPtr
xsltCreateRVT(xsltTransformContextPtr ctxt)
{
    xmlDocPtr container;

    /*
    * Question: Why is this function public?
    * Answer: It is called by the EXSLT module.
    */    
    if (ctxt == NULL)
        return(NULL);

    /*
    * Reuse a RTF from the cache if available.
    */
    if (ctxt->cache->RVT) {
        container = ctxt->cache->RVT;
        ctxt->cache->RVT = (xmlDocPtr) container->next;
        /* clear the internal pointers */
        container->next = NULL;
        container->prev = NULL;
        if (ctxt->cache->nbRVT > 0)
            ctxt->cache->nbRVT--;
#ifdef XSLT_DEBUG_PROFILE_CACHE
        ctxt->cache->dbgReusedRVTs++;
#endif
        return(container);
    }

    container = xmlNewDoc(NULL);
    if (container == NULL)
        return(NULL);
    container->dict = ctxt->dict;
    xmlDictReference(container->dict);
    XSLT_MARK_RES_TREE_FRAG(container);
    container->doc = container;
    container->parent = NULL;
    return(container);
}

/**
 * xsltRegisterTmpRVT:
 * @ctxt:  an XSLT transformation context
 * @RVT:  a result value tree (Result Tree Fragment)
 *
 * Registers the result value tree (XSLT 1.0 term: Result Tree Fragment)
 * in the garbage collector.
 * The fragment will be freed at the exit of the currently
 * instantiated xsl:template.
 * Obsolete; this function might produce massive memory overhead,
 * since the fragment is only freed when the current xsl:template
 * exits. Use xsltRegisterLocalRVT() instead.
 *
 * Returns 0 in case of success and -1 in case of API or internal errors.
 */
int
xsltRegisterTmpRVT(xsltTransformContextPtr ctxt, xmlDocPtr RVT)
{
    if ((ctxt == NULL) || (RVT == NULL))
        return(-1);

    /*
    * We'll restrict the lifetime of user-created fragments
    * insinde an xsl:variable and xsl:param to the lifetime of the
    * var/param itself.
    */
    if (ctxt->contextVariable != NULL) {
        RVT->next = (xmlNodePtr) XSLT_TCTXT_VARIABLE(ctxt)->fragment;
        XSLT_TCTXT_VARIABLE(ctxt)->fragment = RVT;
        return(0);
    }

    RVT->next = (xmlNodePtr) ctxt->tmpRVT;
    if (ctxt->tmpRVT != NULL)
        ctxt->tmpRVT->prev = (xmlNodePtr) RVT;
    ctxt->tmpRVT = RVT;
    return(0);
}

/**
 * xsltRegisterLocalRVT:
 * @ctxt:  an XSLT transformation context
 * @RVT:  a result value tree (Result Tree Fragment; xmlDocPtr)
 *
 * Registers a result value tree (XSLT 1.0 term: Result Tree Fragment)
 * in the RVT garbage collector.
 * The fragment will be freed when the instruction which created the
 * fragment exits.
 *
 * Returns 0 in case of success and -1 in case of API or internal errors.
 */
int
xsltRegisterLocalRVT(xsltTransformContextPtr ctxt,
                     xmlDocPtr RVT)
{
    if ((ctxt == NULL) || (RVT == NULL))
        return(-1);
    
    /*
    * When evaluating "select" expressions of xsl:variable
    * and xsl:param, we need to bind newly created tree fragments
    * to the variable itself; otherwise the tragment will be
    * freed before we leave the scope of a var.
    */
    if ((ctxt->contextVariable != NULL) &&
        (XSLT_TCTXT_VARIABLE(ctxt)->flags & XSLT_VAR_IN_SELECT))
    {
        RVT->next = (xmlNodePtr) XSLT_TCTXT_VARIABLE(ctxt)->fragment;
        XSLT_TCTXT_VARIABLE(ctxt)->fragment = RVT;
        return(0);
    }
    /*
    * Store the fragment in the scope of the current instruction.
    * If not reference by a returning instruction (like EXSLT's function),
    * then this fragment will be freed, when the instruction exits.
    */
    RVT->next = (xmlNodePtr) ctxt->localRVT;
    if (ctxt->localRVT != NULL)
        ctxt->localRVT->prev = (xmlNodePtr) RVT;
    ctxt->localRVT = RVT;
    /*
    * We need to keep track of the first registered fragment
    * for extension instructions which return fragments
    * (e.g. EXSLT'S function), in order to let
    * xsltExtensionInstructionResultFinalize() clear the
    * preserving flag on the fragments.
    */
    if (ctxt->localRVTBase == NULL)
        ctxt->localRVTBase = RVT;
    return(0);
}

/**
 * xsltExtensionInstructionResultFinalize:
 * @ctxt:  an XSLT transformation context
 *
 * Finalizes the data (e.g. result tree fragments) created
 * within a value-returning process (e.g. EXSLT's function).
 * Tree fragments marked as being returned by a function are
 * set to normal state, which means that the fragment garbage
 * collector will free them after the function-calling process exits.
 *
 * Returns 0 in case of success and -1 in case of API or internal errors.
 */
int
xsltExtensionInstructionResultFinalize(xsltTransformContextPtr ctxt)
{
    xmlDocPtr cur;

    if (ctxt == NULL)
        return(-1);
    if (ctxt->localRVTBase == NULL)
        return(0);
    /*
    * Enable remaining local tree fragments to be freed
    * by the fragment garbage collector.
    */
    cur = ctxt->localRVTBase;
    do {
        cur->psvi = NULL;
        cur = (xmlDocPtr) cur->next;
    } while (cur != NULL);
    return(0);
}

/**
 * xsltExtensionInstructionResultRegister:
 * @ctxt: an XSLT transformation context
 * @obj: an XPath object to be inspected for result tree fragments
 *
 * Marks the result of a value-returning extension instruction
 * in order to avoid it being garbage collected before the
 * extension instruction exits.
 * Note that one still has to additionally register any newly created
 * tree fragments (via xsltCreateRVT()) with xsltRegisterLocalRVT().
 *
 * Returns 0 in case of success and -1 in case of error.
 */
int
xsltExtensionInstructionResultRegister(xsltTransformContextPtr ctxt,
                                       xmlXPathObjectPtr obj)
{
    int i;
    xmlNodePtr cur;
    xmlDocPtr doc;

    if ((ctxt == NULL) || (obj == NULL))
        return(-1);

    /*
    * OPTIMIZE TODO: If no local variables/params and no local tree
    * fragments were created, then we don't need to analyse the XPath
    * objects for tree fragments.
    */

    if ((obj->type != XPATH_NODESET) && (obj->type != XPATH_XSLT_TREE))
        return(0);
    if ((obj->nodesetval == NULL) || (obj->nodesetval->nodeNr == 0))
        return(0);

    for (i = 0; i < obj->nodesetval->nodeNr; i++) {
        cur = obj->nodesetval->nodeTab[i];
        if (cur->type == XML_NAMESPACE_DECL) {
            /*
            * The XPath module sets the owner element of a ns-node on
            * the ns->next field.
            */
            if ((((xmlNsPtr) cur)->next != NULL) &&
                (((xmlNsPtr) cur)->next->type == XML_ELEMENT_NODE))
            {
                cur = (xmlNodePtr) ((xmlNsPtr) cur)->next;
                doc = cur->doc; 
            } else {
                xsltTransformError(ctxt, NULL, ctxt->inst,
                    "Internal error in "
                    "xsltExtensionInstructionResultRegister(): "
                    "Cannot retrieve the doc of a namespace node.\n");
                goto error;
            }
        } else {
            doc = cur->doc;
        }
        if (doc == NULL) {
            xsltTransformError(ctxt, NULL, ctxt->inst,
                "Internal error in "
                "xsltExtensionInstructionResultRegister(): "
                "Cannot retrieve the doc of a node.\n");
            goto error;
        }
        if (doc->name && (doc->name[0] == ' ')) {
            /*
            * This is a result tree fragment.
            * We'll use the @psvi field for reference counting.
            * TODO: How do we know if this is a value of a
            *  global variable or a doc acquired via the
            *  document() function?
            */
            doc->psvi = (void *) ((long) 1);
        }
    }

    return(0);
error:
    return(-1);
}

/**
 * xsltReleaseRVT:
 * @ctxt:  an XSLT transformation context
 * @RVT:  a result value tree (Result Tree Fragment)
 *
 * Either frees the RVT (which is an xmlDoc) or stores
 * it in the context's cache for later reuse.
 */
void
xsltReleaseRVT(xsltTransformContextPtr ctxt, xmlDocPtr RVT)
{
    if (RVT == NULL)
        return;

    if (ctxt && (ctxt->cache->nbRVT < 40)) {
        /*
        * Store the Result Tree Fragment.
        * Free the document info.
        */
        if (RVT->_private != NULL) {
            xsltFreeDocumentKeys((xsltDocumentPtr) RVT->_private);
            xmlFree(RVT->_private);
            RVT->_private = NULL;
        }
        /*
        * Clear the document tree.
        * REVISIT TODO: Do we expect ID/IDREF tables to be existent?    
        */
        if (RVT->children != NULL) {
            xmlFreeNodeList(RVT->children);
            RVT->children = NULL;
            RVT->last = NULL;
        }
        if (RVT->ids != NULL) {
            xmlFreeIDTable((xmlIDTablePtr) RVT->ids);
            RVT->ids = NULL;
        }
        if (RVT->refs != NULL) {
            xmlFreeRefTable((xmlRefTablePtr) RVT->refs);
            RVT->refs = NULL;
        }

        /*
        * Reset the reference counter.
        */
        RVT->psvi = 0;

        RVT->next = (xmlNodePtr) ctxt->cache->RVT;
        ctxt->cache->RVT = RVT;

        ctxt->cache->nbRVT++;

#ifdef XSLT_DEBUG_PROFILE_CACHE
        ctxt->cache->dbgCachedRVTs++;
#endif
        return;
    }
    /*
    * Free it.
    */
    if (RVT->_private != NULL) {
        xsltFreeDocumentKeys((xsltDocumentPtr) RVT->_private);
        xmlFree(RVT->_private);
    }
    xmlFreeDoc(RVT);
}

/**
 * xsltRegisterPersistRVT:
 * @ctxt:  an XSLT transformation context
 * @RVT:  a result value tree (Result Tree Fragment)
 *
 * Register the result value tree (XSLT 1.0 term: Result Tree Fragment)
 * in the fragment garbage collector.
 * The fragment will be freed when the transformation context is
 * freed.
 *
 * Returns 0 in case of success and -1 in case of error.
 */
int
xsltRegisterPersistRVT(xsltTransformContextPtr ctxt, xmlDocPtr RVT)
{
    if ((ctxt == NULL) || (RVT == NULL)) return(-1);

    RVT->next = (xmlNodePtr) ctxt->persistRVT;
    if (ctxt->persistRVT != NULL)
        ctxt->persistRVT->prev = (xmlNodePtr) RVT;
    ctxt->persistRVT = RVT;
    return(0);
}

/**
 * xsltFreeRVTs:
 * @ctxt:  an XSLT transformation context
 *
 * Frees all registered result value trees (Result Tree Fragments)
 * of the transformation. Internal function; should not be called
 * by user-code.
 */
void
xsltFreeRVTs(xsltTransformContextPtr ctxt)
{
    xmlDocPtr cur, next;

    if (ctxt == NULL)
        return;
    /*
    * Local fragments.
    */
    cur = ctxt->localRVT;
    while (cur != NULL) {
        next = (xmlDocPtr) cur->next;
        if (cur->_private != NULL) {
            xsltFreeDocumentKeys(cur->_private);
            xmlFree(cur->_private);
        }
        xmlFreeDoc(cur);
        cur = next;
    }
    ctxt->localRVT = NULL;
    /*
    * User-created per-template fragments.
    */
    cur = ctxt->tmpRVT;
    while (cur != NULL) {
        next = (xmlDocPtr) cur->next;
        if (cur->_private != NULL) {
            xsltFreeDocumentKeys(cur->_private);
            xmlFree(cur->_private);
        }
        xmlFreeDoc(cur);
        cur = next;
    }
    ctxt->tmpRVT = NULL;
    /*
    * Global fragments.
    */
    cur = ctxt->persistRVT;
    while (cur != NULL) {
        next = (xmlDocPtr) cur->next;
        if (cur->_private != NULL) {
            xsltFreeDocumentKeys(cur->_private);
            xmlFree(cur->_private);
        }
        xmlFreeDoc(cur);
        cur = next;
    }
    ctxt->persistRVT = NULL;
}

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

/**
 * xsltNewStackElem:
 *
 * Create a new XSLT ParserContext
 *
 * Returns the newly allocated xsltParserStackElem or NULL in case of error
 */
static xsltStackElemPtr
xsltNewStackElem(xsltTransformContextPtr ctxt)
{
    xsltStackElemPtr ret;
    /*
    * Reuse a stack item from the cache if available.
    */
    if (ctxt && ctxt->cache->stackItems) {
        ret = ctxt->cache->stackItems;
        ctxt->cache->stackItems = ret->next;
        ret->next = NULL;
        ctxt->cache->nbStackItems--;
#ifdef XSLT_DEBUG_PROFILE_CACHE
        ctxt->cache->dbgReusedVars++;
#endif
        return(ret);
    }
    ret = (xsltStackElemPtr) xmlMalloc(sizeof(xsltStackElem));
    if (ret == NULL) {
        xsltTransformError(NULL, NULL, NULL,
                "xsltNewStackElem : malloc failed\n");
        return(NULL);
    }
    memset(ret, 0, sizeof(xsltStackElem));
    ret->context = ctxt;
    return(ret);
}

/**
 * xsltCopyStackElem:
 * @elem:  an XSLT stack element
 *
 * Makes a copy of the stack element
 *
 * Returns the copy of NULL
 */
static xsltStackElemPtr
xsltCopyStackElem(xsltStackElemPtr elem) {
    xsltStackElemPtr cur;

    cur = (xsltStackElemPtr) xmlMalloc(sizeof(xsltStackElem));
    if (cur == NULL) {
        xsltTransformError(NULL, NULL, NULL,
                "xsltCopyStackElem : malloc failed\n");
        return(NULL);
    }
    memset(cur, 0, sizeof(xsltStackElem));
    cur->context = elem->context;
    cur->name = elem->name;
    cur->nameURI = elem->nameURI;
    cur->select = elem->select;
    cur->tree = elem->tree;
    cur->comp = elem->comp;    
    return(cur);
}

/**
 * xsltFreeStackElem:
 * @elem:  an XSLT stack element
 *
 * Free up the memory allocated by @elem
 */
static void
xsltFreeStackElem(xsltStackElemPtr elem) {
    if (elem == NULL)
        return;
    if (elem->value != NULL)
        xmlXPathFreeObject(elem->value);
    /*
    * Release the list of temporary Result Tree Fragments.
    */
    if (elem->fragment) {
        xmlDocPtr cur;

        while (elem->fragment != NULL) {
            cur = elem->fragment;
            elem->fragment = (xmlDocPtr) cur->next;

            if (elem->context &&
                (cur->psvi == (void *) ((long) 1)))
            {
                /*
                * This fragment is a result of an extension instruction
                * (e.g. XSLT's function) and needs to be preserved until
                * the instruction exits.
                * Example: The fragment of the variable must not be freed
                *  since it is returned by the EXSLT function:
                *  <f:function name="foo">
                *   <xsl:variable name="bar">
                *     <bar/>
                *   </xsl:variable>
                *   <f:result select="$bar"/>
                *  </f:function>
                * 
                */
                xsltRegisterLocalRVT(elem->context, cur);
            } else {
                xsltReleaseRVT((xsltTransformContextPtr) elem->context,
                    cur);
            }       
        }
    }
    /*
    * Cache or free the variable structure.
    */
    if (elem->context && (elem->context->cache->nbStackItems < 50)) {
        /*
        * Store the item in the cache.
        */
        xsltTransformContextPtr ctxt = elem->context;
        memset(elem, 0, sizeof(xsltStackElem));
        elem->context = ctxt;
        elem->next = ctxt->cache->stackItems;
        ctxt->cache->stackItems = elem; 
        ctxt->cache->nbStackItems++;
#ifdef XSLT_DEBUG_PROFILE_CACHE
        ctxt->cache->dbgCachedVars++;
#endif
        return;
    }
    xmlFree(elem);
}

/**
 * xsltFreeStackElemList:
 * @elem:  an XSLT stack element
 *
 * Free up the memory allocated by @elem
 */
void
xsltFreeStackElemList(xsltStackElemPtr elem) {
    xsltStackElemPtr next;
    
    while (elem != NULL) {
        next = elem->next;
        xsltFreeStackElem(elem);
        elem = next;
    }
}

/**
 * xsltStackLookup:
 * @ctxt:  an XSLT transformation context
 * @name:  the local part of the name
 * @nameURI:  the URI part of the name
 *
 * Locate an element in the stack based on its name.
 */
#if 0 /* TODO: Those seem to have been used for debugging. */
static int stack_addr = 0;
static int stack_cmp = 0;
#endif

static xsltStackElemPtr
xsltStackLookup(xsltTransformContextPtr ctxt, const xmlChar *name,
                const xmlChar *nameURI) {
    int i;
    xsltStackElemPtr cur;

    if ((ctxt == NULL) || (name == NULL) || (ctxt->varsNr == 0))
        return(NULL);

    /*
     * Do the lookup from the top of the stack, but
     * don't use params being computed in a call-param
     * First lookup expects the variable name and URI to
     * come from the disctionnary and hence pointer comparison.
     */
    for (i = ctxt->varsNr; i > ctxt->varsBase; i--) {
        cur = ctxt->varsTab[i-1];
        while (cur != NULL) {
            if ((cur->name == name) && (cur->nameURI == nameURI)) {
#if 0
                stack_addr++;
#endif
                return(cur);
            }
            cur = cur->next;
        }
    }

    /*
     * Redo the lookup with interned string compares
     * to avoid string compares.
     */
    name = xmlDictLookup(ctxt->dict, name, -1);
    if (nameURI != NULL)
        nameURI = xmlDictLookup(ctxt->dict, nameURI, -1);

    for (i = ctxt->varsNr; i > ctxt->varsBase; i--) {
        cur = ctxt->varsTab[i-1];
        while (cur != NULL) {
            if ((cur->name == name) && (cur->nameURI == nameURI)) {
#if 0
                stack_cmp++;
#endif
                return(cur);
            }
            cur = cur->next;
        }
    }

    return(NULL);
}

/**
 * xsltCheckStackElem:
 * @ctxt:  xn XSLT transformation context
 * @name:  the variable name
 * @nameURI:  the variable namespace URI
 *
 * Checks whether a variable or param is already defined.
 *
 * URGENT TODO: Checks for redefinition of vars/params should be
 *  done only at compilation time.
 *
 * Returns 1 if variable is present, 2 if param is present, 3 if this
 *         is an inherited param, 0 if not found, -1 in case of failure.
 */
static int
xsltCheckStackElem(xsltTransformContextPtr ctxt, const xmlChar *name,
                   const xmlChar *nameURI) {
    xsltStackElemPtr cur;

    if ((ctxt == NULL) || (name == NULL))
        return(-1);

    cur = xsltStackLookup(ctxt, name, nameURI);
    if (cur == NULL)
        return(0);
    if (cur->comp != NULL) {
        if (cur->comp->type == XSLT_FUNC_WITHPARAM)
            return(3);
        else if (cur->comp->type == XSLT_FUNC_PARAM)
            return(2);
    }
    
    return(1);
}

/**
 * xsltAddStackElem:
 * @ctxt:  xn XSLT transformation context
 * @elem:  a stack element
 *
 * Push an element (or list) onto the stack.
 * In case of a list, each member will be pushed into
 * a seperate slot; i.e. there's always 1 stack entry for
 * 1 stack element.
 *
 * Returns 0 in case of success, -1 in case of failure.
 */
static int
xsltAddStackElem(xsltTransformContextPtr ctxt, xsltStackElemPtr elem)
{
    if ((ctxt == NULL) || (elem == NULL))
        return(-1);

    do {
        if (ctxt->varsMax == 0) {
            ctxt->varsMax = 10;
            ctxt->varsTab =
                (xsltStackElemPtr *) xmlMalloc(ctxt->varsMax *
                sizeof(ctxt->varsTab[0]));
            if (ctxt->varsTab == NULL) {
                xmlGenericError(xmlGenericErrorContext, "malloc failed !\n");
                return (-1);
            }
        }
        if (ctxt->varsNr >= ctxt->varsMax) {
            ctxt->varsMax *= 2;
            ctxt->varsTab =
                (xsltStackElemPtr *) xmlRealloc(ctxt->varsTab,
                ctxt->varsMax *
                sizeof(ctxt->varsTab[0]));
            if (ctxt->varsTab == NULL) {
                xmlGenericError(xmlGenericErrorContext, "realloc failed !\n");
                return (-1);
            }
        }
        ctxt->varsTab[ctxt->varsNr++] = elem;
        ctxt->vars = elem;
        
        elem = elem->next;
    } while (elem != NULL);
    
    return(0);
}

/**
 * xsltAddStackElemList:
 * @ctxt:  xn XSLT transformation context
 * @elems:  a stack element list
 *
 * Push an element list onto the stack.
 *
 * Returns 0 in case of success, -1 in case of failure.
 */
int
xsltAddStackElemList(xsltTransformContextPtr ctxt, xsltStackElemPtr elems)
{
    return(xsltAddStackElem(ctxt, elems));
}

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

/**
 * xsltEvalVariable:
 * @ctxt:  the XSLT transformation context
 * @variable:  the variable or parameter item
 * @comp: the compiled XSLT instruction
 *
 * Evaluate a variable value.
 *
 * Returns the XPath Object value or NULL in case of error
 */
static xmlXPathObjectPtr
xsltEvalVariable(xsltTransformContextPtr ctxt, xsltStackElemPtr variable,
                 xsltStylePreCompPtr castedComp)
{
#ifdef XSLT_REFACTORED
    xsltStyleItemVariablePtr comp =
        (xsltStyleItemVariablePtr) castedComp;
#else
    xsltStylePreCompPtr comp = castedComp;
#endif   
    xmlXPathObjectPtr result = NULL;
    xmlNodePtr oldInst;

    if ((ctxt == NULL) || (variable == NULL))
        return(NULL);

    /*
    * A variable or parameter are evaluated on demand; thus the
    * context (of XSLT and XPath) need to be temporarily adjusted and
    * restored on exit.
    */
    oldInst = ctxt->inst;

#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
        "Evaluating variable '%s'\n", variable->name));
#endif
    if (variable->select != NULL) {
        xmlXPathCompExprPtr xpExpr = NULL;
        xmlDocPtr oldXPDoc;
        xmlNodePtr oldXPContextNode;
        int oldXPProximityPosition, oldXPContextSize, oldXPNsNr;
        xmlNsPtr *oldXPNamespaces;
        xmlXPathContextPtr xpctxt = ctxt->xpathCtxt;
        xsltStackElemPtr oldVar = ctxt->contextVariable;

        if ((comp != NULL) && (comp->comp != NULL)) {
            xpExpr = comp->comp;
        } else {
            xpExpr = xmlXPathCompile(variable->select);
        }
        if (xpExpr == NULL)
            return(NULL);
        /*
        * Save context states.
        */
        oldXPDoc = xpctxt->doc;
        oldXPContextNode = xpctxt->node;
        oldXPProximityPosition = xpctxt->proximityPosition;
        oldXPContextSize = xpctxt->contextSize;
        oldXPNamespaces = xpctxt->namespaces;
        oldXPNsNr = xpctxt->nsNr;
                
        xpctxt->node = ctxt->node;
        /*
        * OPTIMIZE TODO: Lame try to set the context doc.
        *   Get rid of this somehow in xpath.c.
        */
        if ((ctxt->node->type != XML_NAMESPACE_DECL) &&
            ctxt->node->doc)
            xpctxt->doc = ctxt->node->doc;
        /*
        * BUG TODO: The proximity position and the context size will
        *  potentially be wrong.
        *  Example: 
        *  <xsl:template select="foo">
        *    <xsl:variable name="pos" select="position()"/>
        *    <xsl:for-each select="bar">
        *      <xsl:value-of select="$pos"/>
        *    </xsl:for-each>
        *  </xsl:template>
        *  Here the proximity position and context size are changed
        *  to the context of <xsl:for-each select="bar">, but
        *  the variable needs to be evaluated in the context of
        *  <xsl:template select="foo">.
        */      
        if (comp != NULL) {
            
#ifdef XSLT_REFACTORED
            if (comp->inScopeNs != NULL) {
                xpctxt->namespaces = comp->inScopeNs->list;
                xpctxt->nsNr = comp->inScopeNs->xpathNumber;
            } else {
                xpctxt->namespaces = NULL;
                xpctxt->nsNr = 0;
            }
#else
            xpctxt->namespaces = comp->nsList;
            xpctxt->nsNr = comp->nsNr;
#endif
        } else {
            xpctxt->namespaces = NULL;
            xpctxt->nsNr = 0;
        }

        /*
        * We need to mark that we are "selecting" a var's value;
        * if any tree fragments are created inside the expression,
        * then those need to be stored inside the variable; otherwise
        * we'll eventually free still referenced fragments, before
        * we leave the scope of the variable.
        */
        ctxt->contextVariable = variable;       
        variable->flags |= XSLT_VAR_IN_SELECT;  
        
        result = xmlXPathCompiledEval(xpExpr, xpctxt);

        variable->flags ^= XSLT_VAR_IN_SELECT;
        /*
        * Restore Context states.
        */
        ctxt->contextVariable = oldVar;

        xpctxt->doc = oldXPDoc;
        xpctxt->node = oldXPContextNode;
        xpctxt->contextSize = oldXPContextSize;
        xpctxt->proximityPosition = oldXPProximityPosition;
        xpctxt->namespaces = oldXPNamespaces;
        xpctxt->nsNr = oldXPNsNr;

        if ((comp == NULL) || (comp->comp == NULL))
            xmlXPathFreeCompExpr(xpExpr);
        if (result == NULL) {
            xsltTransformError(ctxt, NULL,
                (comp != NULL) ? comp->inst : NULL,
                "Failed to evaluate the expression of variable '%s'.\n",
                variable->name);
            ctxt->state = XSLT_STATE_STOPPED;

#ifdef WITH_XSLT_DEBUG_VARIABLE
#ifdef LIBXML_DEBUG_ENABLED
        } else {
            if ((xsltGenericDebugContext == stdout) ||
                (xsltGenericDebugContext == stderr))
                xmlXPathDebugDumpObject((FILE *)xsltGenericDebugContext,
                                        result, 0);
#endif
#endif
        }
    } else {
        if (variable->tree == NULL) {
            result = xmlXPathNewCString("");
        } else {            
            if (variable->tree) {
                xmlDocPtr container;
                xmlNodePtr oldInsert;
                xmlDocPtr  oldOutput;
                xsltStackElemPtr oldVar = ctxt->contextVariable;

                /*
                * Generate a result tree fragment.
                */
                container = xsltCreateRVT(ctxt);
                if (container == NULL)
                    goto error;
                /*
                * NOTE: Local Result Tree Fragments of params/variables
                * are not registered globally anymore; the life-time
                * is not directly dependant of the param/variable itself.
                *
                * OLD: xsltRegisterTmpRVT(ctxt, container);
                */
                /*
                * Attach the Result Tree Fragment to the variable;
                * when the variable is freed, it will also free 
                * the Result Tree Fragment.
                */
                variable->fragment = container;
                
                oldOutput = ctxt->output;
                oldInsert = ctxt->insert;               
                
                ctxt->output = container;
                ctxt->insert = (xmlNodePtr) container;
                ctxt->contextVariable = variable;
                /*
                * Process the sequence constructor (variable->tree).
                * The resulting tree will be held by @container.
                */
                xsltApplyOneTemplate(ctxt, ctxt->node, variable->tree,
                    NULL, NULL);

                ctxt->contextVariable = oldVar;         
                ctxt->insert = oldInsert;
                ctxt->output = oldOutput;
                
                result = xmlXPathNewValueTree((xmlNodePtr) container);
            }
            if (result == NULL) {
                result = xmlXPathNewCString("");
            } else {
                /*
                * Freeing is not handled there anymore.
                * QUESTION TODO: What does the above comment mean?
                */
                result->boolval = 0; 
            }
#ifdef WITH_XSLT_DEBUG_VARIABLE
#ifdef LIBXML_DEBUG_ENABLED

            if ((xsltGenericDebugContext == stdout) ||
                (xsltGenericDebugContext == stderr))
                xmlXPathDebugDumpObject((FILE *)xsltGenericDebugContext,
                                        result, 0);
#endif
#endif
        }
    }

error:
    ctxt->inst = oldInst;
    return(result);
}

/**
 * xsltEvalGlobalVariable:
 * @elem:  the variable or parameter
 * @ctxt:  the XSLT transformation context
 *
 * Evaluates a the value of a global xsl:variable or
 * xsl:param declaration.
 *
 * Returns the XPath Object value or NULL in case of error
 */
static xmlXPathObjectPtr
xsltEvalGlobalVariable(xsltStackElemPtr elem, xsltTransformContextPtr ctxt)
{
    xmlXPathObjectPtr result = NULL;
    xmlNodePtr oldInst;
    const xmlChar* oldVarName;

#ifdef XSLT_REFACTORED
    xsltStyleBasicItemVariablePtr comp;
#else
    xsltStylePreCompPtr comp;
#endif

    if ((ctxt == NULL) || (elem == NULL))
        return(NULL);
    if (elem->computed)
        return(elem->value);


#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
        "Evaluating global variable %s\n", elem->name));
#endif

#ifdef WITH_DEBUGGER
    if ((ctxt->debugStatus != XSLT_DEBUG_NONE) &&
        elem->comp && elem->comp->inst)
        xslHandleDebugger(elem->comp->inst, NULL, NULL, ctxt);
#endif

    oldInst = ctxt->inst;
    comp = elem->comp;
    oldVarName = elem->name;
    elem->name = xsltComputingGlobalVarMarker;
    /*
    * OPTIMIZE TODO: We should consider instantiating global vars/params
    *  on-demand. The vars/params don't need to be evaluated if never
    *  called; and in the case of global params, if values for such params
    *  are provided by the user.
    */
    if (elem->select != NULL) {         
        xmlXPathCompExprPtr xpExpr = NULL;
        xmlDocPtr oldXPDoc;
        xmlNodePtr oldXPContextNode;
        int oldXPProximityPosition, oldXPContextSize, oldXPNsNr;
        xmlNsPtr *oldXPNamespaces;
        xmlXPathContextPtr xpctxt = ctxt->xpathCtxt;

        if ((comp != NULL) && (comp->comp != NULL)) {
            xpExpr = comp->comp;
        } else {
            xpExpr = xmlXPathCompile(elem->select);
        }
        if (xpExpr == NULL)
            goto error;
        
        
        if (comp != NULL)
            ctxt->inst = comp->inst;
        else
            ctxt->inst = NULL;
        /*
        * SPEC XSLT 1.0:
        * "At top-level, the expression or template specifying the
        *  variable value is evaluated with the same context as that used
        *  to process the root node of the source document: the current
        *  node is the root node of the source document and the current
        *  node list is a list containing just the root node of the source
        *  document."   
        */
        /*
        * Save context states.
        */
        oldXPDoc = xpctxt->doc;
        oldXPContextNode = xpctxt->node;
        oldXPProximityPosition = xpctxt->proximityPosition;
        oldXPContextSize = xpctxt->contextSize;
        oldXPNamespaces = xpctxt->namespaces;
        oldXPNsNr = xpctxt->nsNr;
                
        xpctxt->node = ctxt->initialContextNode;
        xpctxt->doc = ctxt->initialContextDoc;
        xpctxt->contextSize = 1;
        xpctxt->proximityPosition = 1;
                
        if (comp != NULL) {
            
#ifdef XSLT_REFACTORED
            if (comp->inScopeNs != NULL) {
                xpctxt->namespaces = comp->inScopeNs->list;
                xpctxt->nsNr = comp->inScopeNs->xpathNumber;
            } else {
                xpctxt->namespaces = NULL;
                xpctxt->nsNr = 0;
            }
#else
            xpctxt->namespaces = comp->nsList;
            xpctxt->nsNr = comp->nsNr;
#endif
        } else {
            xpctxt->namespaces = NULL;
            xpctxt->nsNr = 0;
        }
        
        result = xmlXPathCompiledEval(xpExpr, xpctxt);

        /*
        * Restore Context states.
        */
        xpctxt->doc = oldXPDoc;
        xpctxt->node = oldXPContextNode;
        xpctxt->contextSize = oldXPContextSize;
        xpctxt->proximityPosition = oldXPProximityPosition;
        xpctxt->namespaces = oldXPNamespaces;
        xpctxt->nsNr = oldXPNsNr;

        if ((comp == NULL) || (comp->comp == NULL))
            xmlXPathFreeCompExpr(xpExpr);
        if (result == NULL) {
            if (comp == NULL)
                xsltTransformError(ctxt, NULL, NULL,
                    "Evaluating global variable %s failed\n", elem->name);
            else
                xsltTransformError(ctxt, NULL, comp->inst,
                    "Evaluating global variable %s failed\n", elem->name);
            ctxt->state = XSLT_STATE_STOPPED;
#ifdef WITH_XSLT_DEBUG_VARIABLE
#ifdef LIBXML_DEBUG_ENABLED
        } else {
            if ((xsltGenericDebugContext == stdout) ||
                (xsltGenericDebugContext == stderr))
                xmlXPathDebugDumpObject((FILE *)xsltGenericDebugContext,
                                        result, 0);
#endif
#endif
        }
    } else {
        if (elem->tree == NULL) {
            result = xmlXPathNewCString("");
        } else {
            xmlDocPtr container;
            xmlNodePtr oldInsert;
            xmlDocPtr  oldOutput, oldXPDoc;         
            /*
            * Generate a result tree fragment.
            */
            container = xsltCreateRVT(ctxt);
            if (container == NULL)
                goto error;
            /*
            * Let the lifetime of the tree fragment be handled by
            * the Libxslt's garbage collector.
            */
            xsltRegisterPersistRVT(ctxt, container);        

            oldOutput = ctxt->output;
            oldInsert = ctxt->insert;

            oldXPDoc = ctxt->xpathCtxt->doc;
            
            ctxt->output = container;       
            ctxt->insert = (xmlNodePtr) container;

            ctxt->xpathCtxt->doc = ctxt->initialContextDoc;
            /*
            * Process the sequence constructor.
            */
            xsltApplyOneTemplate(ctxt, ctxt->node, elem->tree, NULL, NULL);

            ctxt->xpathCtxt->doc = oldXPDoc;

            ctxt->insert = oldInsert;
            ctxt->output = oldOutput;
            
            result = xmlXPathNewValueTree((xmlNodePtr) container);
            if (result == NULL) {
                result = xmlXPathNewCString("");
            } else {
                result->boolval = 0; /* Freeing is not handled there anymore */
            }
#ifdef WITH_XSLT_DEBUG_VARIABLE
#ifdef LIBXML_DEBUG_ENABLED
            if ((xsltGenericDebugContext == stdout) ||
                (xsltGenericDebugContext == stderr))
                xmlXPathDebugDumpObject((FILE *)xsltGenericDebugContext,
                                        result, 0);
#endif
#endif
        }
    }

error:
    elem->name = oldVarName;
    ctxt->inst = oldInst;
    if (result != NULL) {
        elem->value = result;
        elem->computed = 1;
    }
    return(result);
}

/**
 * xsltEvalGlobalVariables:
 * @ctxt:  the XSLT transformation context
 *
 * Evaluates all global variables and parameters of a stylesheet.
 * For internal use only. This is called at start of a transformation.
 *
 * Returns 0 in case of success, -1 in case of error
 */
int
xsltEvalGlobalVariables(xsltTransformContextPtr ctxt) {
    xsltStackElemPtr elem;
    xsltStylesheetPtr style;    

    if ((ctxt == NULL) || (ctxt->document == NULL))
        return(-1);
 
#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
        "Registering global variables\n"));
#endif
    /*
     * Walk the list from the stylesheets and populate the hash table
     */
    style = ctxt->style;
    while (style != NULL) {
        elem = style->variables;
        
#ifdef WITH_XSLT_DEBUG_VARIABLE
        if ((style->doc != NULL) && (style->doc->URL != NULL)) {
            XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
                             "Registering global variables from %s\n",
                             style->doc->URL));
        }
#endif

        while (elem != NULL) {
            xsltStackElemPtr def;

            /*
             * Global variables are stored in the variables pool.
             */
            def = (xsltStackElemPtr) 
                    xmlHashLookup2(ctxt->globalVars,
                                 elem->name, elem->nameURI);
            if (def == NULL) {

                def = xsltCopyStackElem(elem);
                xmlHashAddEntry2(ctxt->globalVars,
                                 elem->name, elem->nameURI, def);
            } else if ((elem->comp != NULL) &&
                       (elem->comp->type == XSLT_FUNC_VARIABLE)) {
                /*
                 * Redefinition of variables from a different stylesheet
                 * should not generate a message.
                 */
                if ((elem->comp->inst != NULL) &&
                    (def->comp != NULL) && (def->comp->inst != NULL) &&
                    (elem->comp->inst->doc == def->comp->inst->doc))
                {
                    xsltTransformError(ctxt, style, elem->comp->inst,
                        "Global variable %s already defined\n", elem->name);
                    if (style != NULL) style->errors++;
                }
            }
            elem = elem->next;
        }

        style = xsltNextImport(style);
    }

    /*
     * This part does the actual evaluation
     */    
    xmlHashScan(ctxt->globalVars,
                (xmlHashScanner) xsltEvalGlobalVariable, ctxt);

    return(0);
}

/**
 * xsltRegisterGlobalVariable:
 * @style:  the XSLT transformation context
 * @name:  the variable name
 * @ns_uri:  the variable namespace URI
 * @sel:  the expression which need to be evaluated to generate a value
 * @tree:  the subtree if sel is NULL
 * @comp:  the precompiled value
 * @value:  the string value if available
 *
 * Register a new variable value. If @value is NULL it unregisters
 * the variable
 *
 * Returns 0 in case of success, -1 in case of error
 */
static int
xsltRegisterGlobalVariable(xsltStylesheetPtr style, const xmlChar *name,
                     const xmlChar *ns_uri, const xmlChar *sel,
                     xmlNodePtr tree, xsltStylePreCompPtr comp,
                     const xmlChar *value) {
    xsltStackElemPtr elem, tmp;
    if (style == NULL)
        return(-1);
    if (name == NULL)
        return(-1);
    if (comp == NULL)
        return(-1);

#ifdef WITH_XSLT_DEBUG_VARIABLE
    if (comp->type == XSLT_FUNC_PARAM)
        xsltGenericDebug(xsltGenericDebugContext,
                         "Defining global param %s\n", name);
    else
        xsltGenericDebug(xsltGenericDebugContext,
                         "Defining global variable %s\n", name);
#endif

    elem = xsltNewStackElem(NULL);
    if (elem == NULL)
        return(-1);
    elem->comp = comp;
    elem->name = xmlDictLookup(style->dict, name, -1);
    elem->select = xmlDictLookup(style->dict, sel, -1);
    if (ns_uri)
        elem->nameURI = xmlDictLookup(style->dict, ns_uri, -1);
    elem->tree = tree;
    tmp = style->variables;
    if (tmp == NULL) {
        elem->next = NULL;
        style->variables = elem;
    } else {
        while (tmp != NULL) {
            if ((elem->comp->type == XSLT_FUNC_VARIABLE) &&
                (tmp->comp->type == XSLT_FUNC_VARIABLE) &&
                (xmlStrEqual(elem->name, tmp->name)) &&
                ((elem->nameURI == tmp->nameURI) ||
                 (xmlStrEqual(elem->nameURI, tmp->nameURI))))
            {
                xsltTransformError(NULL, style, comp->inst,
                "redefinition of global variable %s\n", elem->name);
                style->errors++;
            }
            if (tmp->next == NULL)
                break;
            tmp = tmp->next;
        }
        elem->next = NULL;
        tmp->next = elem;
    }
    if (value != NULL) {
        elem->computed = 1;
        elem->value = xmlXPathNewString(value);
    }
    return(0);
}

/**
 * xsltProcessUserParamInternal
 *
 * @ctxt:  the XSLT transformation context
 * @name:  a null terminated parameter name
 * @value: a null terminated value (may be an XPath expression)
 * @eval:  0 to treat the value literally, else evaluate as XPath expression
 *
 * If @eval is 0 then @value is treated literally and is stored in the global
 * parameter/variable table without any change.
 *
 * Uf @eval is 1 then @value is treated as an XPath expression and is
 * evaluated.  In this case, if you want to pass a string which will be
 * interpreted literally then it must be enclosed in single or double quotes.
 * If the string contains single quotes (double quotes) then it cannot be
 * enclosed single quotes (double quotes).  If the string which you want to
 * be treated literally contains both single and double quotes (e.g. Meet
 * at Joe's for "Twelfth Night" at 7 o'clock) then there is no suitable
 * quoting character.  You cannot use &apos; or &quot; inside the string
 * because the replacement of character entities with their equivalents is
 * done at a different stage of processing.  The solution is to call
 * xsltQuoteUserParams or xsltQuoteOneUserParam.
 *
 * This needs to be done on parsed stylesheets before starting to apply
 * transformations.  Normally this will be called (directly or indirectly)
 * only from xsltEvalUserParams, xsltEvalOneUserParam, xsltQuoteUserParams,
 * or xsltQuoteOneUserParam.
 *
 * Returns 0 in case of success, -1 in case of error
 */

static
int
xsltProcessUserParamInternal(xsltTransformContextPtr ctxt,
                             const xmlChar * name,
                             const xmlChar * value,
                             int eval) {

    xsltStylesheetPtr style;
    const xmlChar *prefix;
    const xmlChar *href;
    xmlXPathCompExprPtr xpExpr;
    xmlXPathObjectPtr result;
    
    xsltStackElemPtr elem;
    int res;
    void *res_ptr;

    if (ctxt == NULL)
        return(-1);
    if (name == NULL)
        return(0);
    if (value == NULL)
        return(0);

    style = ctxt->style;

#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
            "Evaluating user parameter %s=%s\n", name, value));
#endif

    /*
     * Name lookup
     */

    name = xsltSplitQName(ctxt->dict, name, &prefix);
    href = NULL;
    if (prefix != NULL) {
        xmlNsPtr ns;

        ns = xmlSearchNs(style->doc, xmlDocGetRootElement(style->doc),
                         prefix);
        if (ns == NULL) {
            xsltTransformError(ctxt, style, NULL,
            "user param : no namespace bound to prefix %s\n", prefix);
            href = NULL;
        } else {
            href = ns->href;
        }
    }

    if (name == NULL)
        return (-1);

    res_ptr = xmlHashLookup2(ctxt->globalVars, name, href);
    if (res_ptr != 0) {
        xsltTransformError(ctxt, style, NULL,
            "Global parameter %s already defined\n", name);
    }
    if (ctxt->globalVars == NULL)
        ctxt->globalVars = xmlHashCreate(20);

    /*
     * do not overwrite variables with parameters from the command line
     */
    while (style != NULL) {
        elem = ctxt->style->variables;
        while (elem != NULL) {
            if ((elem->comp != NULL) &&
                (elem->comp->type == XSLT_FUNC_VARIABLE) &&
                (xmlStrEqual(elem->name, name)) &&
                (xmlStrEqual(elem->nameURI, href))) {
                return(0);
            }
            elem = elem->next;
        }
        style = xsltNextImport(style);
    }
    style = ctxt->style;
    elem = NULL;

    /*
     * Do the evaluation if @eval is non-zero.
     */

    result = NULL;
    if (eval != 0) {
        xpExpr = xmlXPathCompile(value);
        if (xpExpr != NULL) {
            xmlDocPtr oldXPDoc;
            xmlNodePtr oldXPContextNode;
            int oldXPProximityPosition, oldXPContextSize, oldXPNsNr;
            xmlNsPtr *oldXPNamespaces;
            xmlXPathContextPtr xpctxt = ctxt->xpathCtxt;
           
            /*
            * Save context states.
            */
            oldXPDoc = xpctxt->doc;
            oldXPContextNode = xpctxt->node;
            oldXPProximityPosition = xpctxt->proximityPosition;
            oldXPContextSize = xpctxt->contextSize;
            oldXPNamespaces = xpctxt->namespaces;
            oldXPNsNr = xpctxt->nsNr;

            /*
            * SPEC XSLT 1.0:
            * "At top-level, the expression or template specifying the
            *  variable value is evaluated with the same context as that used
            *  to process the root node of the source document: the current
            *  node is the root node of the source document and the current
            *  node list is a list containing just the root node of the source
            *  document."
            */
            xpctxt->doc = ctxt->initialContextDoc;          
            xpctxt->node = ctxt->initialContextNode;        
            xpctxt->contextSize = 1;
            xpctxt->proximityPosition = 1;
            /* 
            * There is really no in scope namespace for parameters on the
            * command line.
            */
            xpctxt->namespaces = NULL;
            xpctxt->nsNr = 0;      
            
            result = xmlXPathCompiledEval(xpExpr, xpctxt);
            
            /*
            * Restore Context states.
            */
            xpctxt->doc = oldXPDoc;
            xpctxt->node = oldXPContextNode;
            xpctxt->contextSize = oldXPContextSize;
            xpctxt->proximityPosition = oldXPProximityPosition;
            xpctxt->namespaces = oldXPNamespaces;
            xpctxt->nsNr = oldXPNsNr;
            
            xmlXPathFreeCompExpr(xpExpr);
        }
        if (result == NULL) {
            xsltTransformError(ctxt, style, NULL,
                "Evaluating user parameter %s failed\n", name);
            ctxt->state = XSLT_STATE_STOPPED;
            return(-1);
        }
    }

    /* 
     * If @eval is 0 then @value is to be taken literally and result is NULL
     * 
     * If @eval is not 0, then @value is an XPath expression and has been
     * successfully evaluated and result contains the resulting value and
     * is not NULL.
     *
     * Now create an xsltStackElemPtr for insertion into the context's
     * global variable/parameter hash table.
     */

#ifdef WITH_XSLT_DEBUG_VARIABLE
#ifdef LIBXML_DEBUG_ENABLED
    if ((xsltGenericDebugContext == stdout) ||
        (xsltGenericDebugContext == stderr))
            xmlXPathDebugDumpObject((FILE *)xsltGenericDebugContext,
                                    result, 0);
#endif
#endif

    elem = xsltNewStackElem(NULL);
    if (elem != NULL) {
        elem->name = name;
        elem->select = xmlDictLookup(ctxt->dict, value, -1);
        if (href != NULL)
            elem->nameURI = xmlDictLookup(ctxt->dict, href, -1);
        elem->tree = NULL;
        elem->computed = 1;
        if (eval == 0) {
            elem->value = xmlXPathNewString(value);
        } 
        else {
            elem->value = result;
        }
    }

    /*
     * Global parameters are stored in the XPath context variables pool.
     */

    res = xmlHashAddEntry2(ctxt->globalVars, name, href, elem);
    if (res != 0) {
        xsltFreeStackElem(elem);
        xsltTransformError(ctxt, style, NULL,
            "Global parameter %s already defined\n", name);
    }
    return(0);
}

/**
 * xsltEvalUserParams:
 *
 * @ctxt:  the XSLT transformation context
 * @params:  a NULL terminated array of parameters name/value tuples
 *
 * Evaluate the global variables of a stylesheet. This needs to be
 * done on parsed stylesheets before starting to apply transformations.
 * Each of the parameters is evaluated as an XPath expression and stored
 * in the global variables/parameter hash table.  If you want your
 * parameter used literally, use xsltQuoteUserParams.
 *
 * Returns 0 in case of success, -1 in case of error
 */
 
int
xsltEvalUserParams(xsltTransformContextPtr ctxt, const char **params) {
    int indx = 0;
    const xmlChar *name;
    const xmlChar *value;

    if (params == NULL)
        return(0);
    while (params[indx] != NULL) {
        name = (const xmlChar *) params[indx++];
        value = (const xmlChar *) params[indx++];
        if (xsltEvalOneUserParam(ctxt, name, value) != 0) 
            return(-1);
    }
    return 0;
}

/**
 * xsltQuoteUserParams:
 *
 * @ctxt:  the XSLT transformation context
 * @params:  a NULL terminated arry of parameters names/values tuples
 *
 * Similar to xsltEvalUserParams, but the values are treated literally and
 * are * *not* evaluated as XPath expressions. This should be done on parsed
 * stylesheets before starting to apply transformations.
 *
 * Returns 0 in case of success, -1 in case of error.
 */
 
int
xsltQuoteUserParams(xsltTransformContextPtr ctxt, const char **params) {
    int indx = 0;
    const xmlChar *name;
    const xmlChar *value;

    if (params == NULL)
        return(0);
    while (params[indx] != NULL) {
        name = (const xmlChar *) params[indx++];
        value = (const xmlChar *) params[indx++];
        if (xsltQuoteOneUserParam(ctxt, name, value) != 0) 
            return(-1);
    }
    return 0;
}

/**
 * xsltEvalOneUserParam:
 * @ctxt:  the XSLT transformation context
 * @name:  a null terminated string giving the name of the parameter
 * @value:  a null terminated string giving the XPath expression to be evaluated
 *
 * This is normally called from xsltEvalUserParams to process a single
 * parameter from a list of parameters.  The @value is evaluated as an
 * XPath expression and the result is stored in the context's global
 * variable/parameter hash table.
 *
 * To have a parameter treated literally (not as an XPath expression)
 * use xsltQuoteUserParams (or xsltQuoteOneUserParam).  For more
 * details see description of xsltProcessOneUserParamInternal.
 *
 * Returns 0 in case of success, -1 in case of error.
 */

int
xsltEvalOneUserParam(xsltTransformContextPtr ctxt,
                     const xmlChar * name,
                     const xmlChar * value) {
    return xsltProcessUserParamInternal(ctxt, name, value,
                                        1 /* xpath eval ? */);
}

/**
 * xsltQuoteOneUserParam:
 * @ctxt:  the XSLT transformation context
 * @name:  a null terminated string giving the name of the parameter
 * @value:  a null terminated string giving the parameter value
 *
 * This is normally called from xsltQuoteUserParams to process a single
 * parameter from a list of parameters.  The @value is stored in the
 * context's global variable/parameter hash table.
 *
 * Returns 0 in case of success, -1 in case of error.
 */

int
xsltQuoteOneUserParam(xsltTransformContextPtr ctxt,
                         const xmlChar * name,
                         const xmlChar * value) {
    return xsltProcessUserParamInternal(ctxt, name, value,
                                        0 /* xpath eval ? */);
}

/**
 * xsltBuildVariable:
 * @ctxt:  the XSLT transformation context
 * @comp:  the precompiled form
 * @tree:  the tree if select is NULL
 *
 * Computes a new variable value.
 *
 * Returns the xsltStackElemPtr or NULL in case of error
 */
static xsltStackElemPtr
xsltBuildVariable(xsltTransformContextPtr ctxt,
                  xsltStylePreCompPtr castedComp,
                  xmlNodePtr tree)
{
#ifdef XSLT_REFACTORED
    xsltStyleBasicItemVariablePtr comp =
        (xsltStyleBasicItemVariablePtr) castedComp;
#else
    xsltStylePreCompPtr comp = castedComp;
#endif 
    xsltStackElemPtr elem;

#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
                     "Building variable %s", comp->name));
    if (comp->select != NULL)
        XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
                         " select %s", comp->select));
    XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext, "\n"));
#endif

    elem = xsltNewStackElem(ctxt);
    if (elem == NULL)
        return(NULL);
    elem->comp = (xsltStylePreCompPtr) comp;
    elem->name = comp->name;
    elem->select = comp->select;
    elem->nameURI = comp->ns;
    elem->tree = tree;
    elem->value = xsltEvalVariable(ctxt, elem,
        (xsltStylePreCompPtr) comp);
    if (elem->value != NULL)
        elem->computed = 1;
    return(elem);
}

/**
 * xsltRegisterVariable:
 * @ctxt:  the XSLT transformation context
 * @comp: the compiled XSLT-variable (or param) instruction
 * @tree:  the tree if select is NULL
 * @isParam:  indicates if this is a parameter
 *
 * Computes and registers a new variable.
 *
 * Returns 0 in case of success, -1 in case of error
 */
static int
xsltRegisterVariable(xsltTransformContextPtr ctxt,
                     xsltStylePreCompPtr castedComp,
                     xmlNodePtr tree, int isParam)
{
#ifdef XSLT_REFACTORED
    xsltStyleBasicItemVariablePtr comp =
        (xsltStyleBasicItemVariablePtr) castedComp;
#else
    xsltStylePreCompPtr comp = castedComp;
    int present;
#endif
    xsltStackElemPtr variable;    
    
#ifdef XSLT_REFACTORED
    /*
    * REFACTORED NOTE: Redefinitions of vars/params are checked
    *  at compilation time in the refactored code.
    * xsl:with-param parameters are checked in xsltApplyXSLTTemplate().
    */
#else
    present = xsltCheckStackElem(ctxt, comp->name, comp->ns);
    if (isParam == 0) { 
        if ((present != 0) && (present != 3)) {
            /* TODO: report QName. */
            xsltTransformError(ctxt, NULL, comp->inst,
                "XSLT-variable: Redefinition of variable '%s'.\n", comp->name);
            return(0);
        }
    } else if (present != 0) {
        if ((present == 1) || (present == 2)) {
            /* TODO: report QName. */
            xsltTransformError(ctxt, NULL, comp->inst,
                "XSLT-param: Redefinition of parameter '%s'.\n", comp->name);
            return(0);
        }
#ifdef WITH_XSLT_DEBUG_VARIABLE
        XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
                 "param %s defined by caller\n", comp->name));
#endif
        return(0);
    }
#endif /* else of XSLT_REFACTORED */

    variable = xsltBuildVariable(ctxt, (xsltStylePreCompPtr) comp, tree);
    xsltAddStackElem(ctxt, variable);
    return(0);
}

/**
 * xsltGlobalVariableLookup:
 * @ctxt:  the XSLT transformation context
 * @name:  the variable name
 * @ns_uri:  the variable namespace URI
 *
 * Search in the Variable array of the context for the given
 * variable value.
 *
 * Returns the value or NULL if not found
 */
static xmlXPathObjectPtr
xsltGlobalVariableLookup(xsltTransformContextPtr ctxt, const xmlChar *name,
                         const xmlChar *ns_uri) {
    xsltStackElemPtr elem;
    xmlXPathObjectPtr ret = NULL;

    /*
     * Lookup the global variables in XPath global variable hash table
     */
    if ((ctxt->xpathCtxt == NULL) || (ctxt->globalVars == NULL))
        return(NULL);
    elem = (xsltStackElemPtr)
            xmlHashLookup2(ctxt->globalVars, name, ns_uri);
    if (elem == NULL) {
#ifdef WITH_XSLT_DEBUG_VARIABLE
        XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
                         "global variable not found %s\n", name));
#endif
        return(NULL);
    }
    /*
    * URGENT TODO: Move the detection of recursive definitions
    * to compile-time.
    */
    if (elem->computed == 0) {
        if (elem->name == xsltComputingGlobalVarMarker) {
            xsltTransformError(ctxt, NULL, elem->comp->inst,
                "Recursive definition of %s\n", name);
            return(NULL);
        }
        ret = xsltEvalGlobalVariable(elem, ctxt);
    } else
        ret = elem->value;
    return(xmlXPathObjectCopy(ret));
}

/**
 * xsltVariableLookup:
 * @ctxt:  the XSLT transformation context
 * @name:  the variable name
 * @ns_uri:  the variable namespace URI
 *
 * Search in the Variable array of the context for the given
 * variable value.
 *
 * Returns the value or NULL if not found
 */
xmlXPathObjectPtr
xsltVariableLookup(xsltTransformContextPtr ctxt, const xmlChar *name,
                   const xmlChar *ns_uri) {
    xsltStackElemPtr elem;

    if (ctxt == NULL)
        return(NULL);

    elem = xsltStackLookup(ctxt, name, ns_uri);
    if (elem == NULL) {
        return(xsltGlobalVariableLookup(ctxt, name, ns_uri));
    }
    if (elem->computed == 0) {
#ifdef WITH_XSLT_DEBUG_VARIABLE
        XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
                         "uncomputed variable %s\n", name));
#endif
        elem->value = xsltEvalVariable(ctxt, elem, NULL);
        elem->computed = 1;
    }
    if (elem->value != NULL)
        return(xmlXPathObjectCopy(elem->value));
#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
                     "variable not found %s\n", name));
#endif
    return(NULL);
}

/**
 * xsltParseStylesheetCallerParam:
 * @ctxt:  the XSLT transformation context 
 * @inst:  the xsl:with-param instruction element
 *
 * Processes an xsl:with-param instruction at transformation time.
 * The value is compute, but not recorded.
 * NOTE that this is also called with an *xsl:param* element
 * from exsltFuncFunctionFunction(). 
 *
 * Returns the new xsltStackElemPtr or NULL
 */

xsltStackElemPtr
xsltParseStylesheetCallerParam(xsltTransformContextPtr ctxt, xmlNodePtr inst)
{
#ifdef XSLT_REFACTORED
    xsltStyleBasicItemVariablePtr comp;
#else
    xsltStylePreCompPtr comp;
#endif
    xmlNodePtr tree = NULL; /* The first child node of the instruction or
                               the instruction itself. */
    xsltStackElemPtr param = NULL;
    
    if ((ctxt == NULL) || (inst == NULL))
        return(NULL);

#ifdef XSLT_REFACTORED
    comp = (xsltStyleBasicItemVariablePtr) inst->psvi;
#else
    comp = (xsltStylePreCompPtr) inst->psvi;
#endif
    
    if (comp == NULL) {
        xsltTransformError(ctxt, NULL, inst,
            "Internal error in xsltParseStylesheetCallerParam(): "
            "The XSLT 'with-param' instruction was not compiled.\n");
        return(NULL);
    }
    if (comp->name == NULL) {
        xsltTransformError(ctxt, NULL, inst,
            "Internal error in xsltParseStylesheetCallerParam(): "
            "XSLT 'with-param': The attribute 'name' was not compiled.\n");
        return(NULL);
    }

#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
            "Handling xsl:with-param %s\n", comp->name));
#endif

    if (comp->select == NULL) {
        tree = inst->children;
    } else {
#ifdef WITH_XSLT_DEBUG_VARIABLE
        XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
            "        select %s\n", comp->select));
#endif
        tree = inst;
    }

    param = xsltBuildVariable(ctxt, (xsltStylePreCompPtr) comp, tree);

    return(param);
}

/**
 * xsltParseGlobalVariable:
 * @style:  the XSLT stylesheet
 * @cur:  the "variable" element
 *
 * Parses a global XSLT 'variable' declaration at compilation time
 * and registers it
 */
void
xsltParseGlobalVariable(xsltStylesheetPtr style, xmlNodePtr cur)
{
#ifdef XSLT_REFACTORED
    xsltStyleItemVariablePtr comp;
#else
    xsltStylePreCompPtr comp;
#endif

    if ((cur == NULL) || (style == NULL))
        return;
    
#ifdef XSLT_REFACTORED
    /*
    * Note that xsltStylePreCompute() will be called from
    * xslt.c only.
    */
    comp = (xsltStyleItemVariablePtr) cur->psvi;
#else
    xsltStylePreCompute(style, cur);
    comp = (xsltStylePreCompPtr) cur->psvi;
#endif
    if (comp == NULL) {
        xsltTransformError(NULL, style, cur,
             "xsl:variable : compilation failed\n");
        return;
    }

    if (comp->name == NULL) {
        xsltTransformError(NULL, style, cur,
            "xsl:variable : missing name attribute\n");
        return;
    }

    /*
    * Parse the content (a sequence constructor) of xsl:variable.
    */
    if (cur->children != NULL) {
#ifdef XSLT_REFACTORED  
        xsltParseSequenceConstructor(XSLT_CCTXT(style), cur->children);
#else
        xsltParseTemplateContent(style, cur);
#endif
    }
#ifdef WITH_XSLT_DEBUG_VARIABLE
    xsltGenericDebug(xsltGenericDebugContext,
        "Registering global variable %s\n", comp->name);
#endif

    xsltRegisterGlobalVariable(style, comp->name, comp->ns,
        comp->select, cur->children, (xsltStylePreCompPtr) comp,
        NULL);
}

/**
 * xsltParseGlobalParam:
 * @style:  the XSLT stylesheet
 * @cur:  the "param" element
 *
 * parse an XSLT transformation param declaration and record
 * its value.
 */

void
xsltParseGlobalParam(xsltStylesheetPtr style, xmlNodePtr cur) {
#ifdef XSLT_REFACTORED
    xsltStyleItemParamPtr comp;
#else
    xsltStylePreCompPtr comp;
#endif

    if ((cur == NULL) || (style == NULL))
        return;
    
#ifdef XSLT_REFACTORED
    /*
    * Note that xsltStylePreCompute() will be called from
    * xslt.c only.
    */
    comp = (xsltStyleItemParamPtr) cur->psvi;
#else
    xsltStylePreCompute(style, cur);
    comp = (xsltStylePreCompPtr) cur->psvi;
#endif    
    if (comp == NULL) {
        xsltTransformError(NULL, style, cur,
             "xsl:param : compilation failed\n");
        return;
    }

    if (comp->name == NULL) {
        xsltTransformError(NULL, style, cur,
            "xsl:param : missing name attribute\n");
        return;
    }

    /*
    * Parse the content (a sequence constructor) of xsl:param.
    */
    if (cur->children != NULL) {
#ifdef XSLT_REFACTORED  
        xsltParseSequenceConstructor(XSLT_CCTXT(style), cur->children);
#else
        xsltParseTemplateContent(style, cur);
#endif
    }

#ifdef WITH_XSLT_DEBUG_VARIABLE
    xsltGenericDebug(xsltGenericDebugContext,
        "Registering global param %s\n", comp->name);
#endif

    xsltRegisterGlobalVariable(style, comp->name, comp->ns,
        comp->select, cur->children, (xsltStylePreCompPtr) comp,
        NULL);
}

/**
 * xsltParseStylesheetVariable:
 * @ctxt:  the XSLT transformation context
 * @inst:  the xsl:variable instruction element
 *
 * Registers a local XSLT 'variable' instruction at transformation time
 * and evaluates its value.
 */
void
xsltParseStylesheetVariable(xsltTransformContextPtr ctxt, xmlNodePtr inst)
{
#ifdef XSLT_REFACTORED
    xsltStyleItemVariablePtr comp;
#else
    xsltStylePreCompPtr comp;
#endif

    if ((inst == NULL) || (ctxt == NULL))
        return;

    comp = inst->psvi;
    if (comp == NULL) {
        xsltTransformError(ctxt, NULL, inst,
            "Internal error in xsltParseStylesheetVariable(): "
            "The XSLT 'variable' instruction was not compiled.\n");
        return;
    }
    if (comp->name == NULL) {
        xsltTransformError(ctxt, NULL, inst,
            "Internal error in xsltParseStylesheetVariable(): "
            "The attribute 'name' was not compiled.\n");
        return;
    }

#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
        "Registering variable '%s'\n", comp->name));
#endif

    xsltRegisterVariable(ctxt, (xsltStylePreCompPtr) comp, inst->children, 0);
}

/**
 * xsltParseStylesheetParam:
 * @ctxt:  the XSLT transformation context
 * @cur:  the XSLT 'param' element
 *
 * Registers a local XSLT 'param' declaration at transformation time and
 * evaluates its value.
 */
void
xsltParseStylesheetParam(xsltTransformContextPtr ctxt, xmlNodePtr cur)
{
#ifdef XSLT_REFACTORED
    xsltStyleItemParamPtr comp;
#else
    xsltStylePreCompPtr comp;
#endif

    if ((cur == NULL) || (ctxt == NULL))
        return;

    comp = cur->psvi;
    if ((comp == NULL) || (comp->name == NULL)) {
        xsltTransformError(ctxt, NULL, cur,
            "Internal error in xsltParseStylesheetParam(): "
            "The XSLT 'param' declaration was not compiled correctly.\n");
        return;
    }

#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(ctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
        "Registering param %s\n", comp->name));
#endif

    xsltRegisterVariable(ctxt, (xsltStylePreCompPtr) comp, cur->children, 1);
}

/**
 * xsltFreeGlobalVariables:
 * @ctxt:  the XSLT transformation context
 *
 * Free up the data associated to the global variables
 * its value.
 */

void
xsltFreeGlobalVariables(xsltTransformContextPtr ctxt) {
    xmlHashFree(ctxt->globalVars, (xmlHashDeallocator) xsltFreeStackElem);
}

/**
 * xsltXPathVariableLookup:
 * @ctxt:  a void * but the the XSLT transformation context actually
 * @name:  the variable name
 * @ns_uri:  the variable namespace URI
 *
 * This is the entry point when a varibale is needed by the XPath
 * interpretor.
 *
 * Returns the value or NULL if not found
 */
xmlXPathObjectPtr
xsltXPathVariableLookup(void *ctxt, const xmlChar *name,
                        const xmlChar *ns_uri) {
    xsltTransformContextPtr tctxt;
    xmlXPathObjectPtr valueObj = NULL;

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

#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(((xsltTransformContextPtr)ctxt),XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
            "Lookup variable '%s'\n", name));
#endif
    
    tctxt = (xsltTransformContextPtr) ctxt;
    /*
    * Local variables/params ---------------------------------------------
    *
    * Do the lookup from the top of the stack, but
    * don't use params being computed in a call-param
    * First lookup expects the variable name and URI to
    * come from the disctionnary and hence pointer comparison.
    */
    if (tctxt->varsNr != 0) {
        int i;
        xsltStackElemPtr variable = NULL, cur;

        for (i = tctxt->varsNr; i > tctxt->varsBase; i--) {
            cur = tctxt->varsTab[i-1];
            if ((cur->name == name) && (cur->nameURI == ns_uri)) {
#if 0
                stack_addr++;
#endif
                variable = cur;
                goto local_variable_found;
            }
            cur = cur->next;
        }       
        /*
        * Redo the lookup with interned strings to avoid string comparison.
        *
        * OPTIMIZE TODO: The problem here is, that if we request a
        *  global variable, then this will be also executed.
        */
        {
            const xmlChar *tmpName = name, *tmpNsName = ns_uri;

            name = xmlDictLookup(tctxt->dict, name, -1);
            if (ns_uri)
                ns_uri = xmlDictLookup(tctxt->dict, ns_uri, -1);
            if ((tmpName != name) || (tmpNsName != ns_uri)) {           
                for (i = tctxt->varsNr; i > tctxt->varsBase; i--) {
                    cur = tctxt->varsTab[i-1];
                    if ((cur->name == name) && (cur->nameURI == ns_uri)) {
#if 0
                        stack_cmp++;
#endif
                        variable = cur;
                        goto local_variable_found;
                    }
                }
            }
        }

local_variable_found:

        if (variable) {
            if (variable->computed == 0) {
                
#ifdef WITH_XSLT_DEBUG_VARIABLE
                XSLT_TRACE(tctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
                    "uncomputed variable '%s'\n", name));
#endif
                variable->value = xsltEvalVariable(tctxt, variable, NULL);
                variable->computed = 1;
            }
            if (variable->value != NULL) {
                valueObj = xmlXPathObjectCopy(variable->value); 
            }
            return(valueObj);
        }
    }
    /*
    * Global variables/params --------------------------------------------
    */    
    if (tctxt->globalVars) {
        valueObj = xsltGlobalVariableLookup(tctxt, name, ns_uri);
    }

    if (valueObj == NULL) {

#ifdef WITH_XSLT_DEBUG_VARIABLE
    XSLT_TRACE(tctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
                     "variable not found '%s'\n", name));
#endif

        if (ns_uri) {
            xsltTransformError(tctxt, NULL, tctxt->inst,
                "Variable '{%s}%s' has not been declared.\n", ns_uri, name);
        } else {
            xsltTransformError(tctxt, NULL, tctxt->inst,
                "Variable '%s' has not been declared.\n", name);
        }
    } else {

#ifdef WITH_XSLT_DEBUG_VARIABLE
        XSLT_TRACE(tctxt,XSLT_TRACE_VARIABLES,xsltGenericDebug(xsltGenericDebugContext,
            "found variable '%s'\n", name));
#endif
    }

    return(valueObj);
}
/* [<][>][^][v][top][bottom][index][help] */
root/third_party/libxslt/libxslt/variables.c

DEFINITIONS
