xpointer.c 74.9 KB
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/*
 * xpointer.c : Code to handle XML Pointer
 *
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 * Base implementation was made accordingly to
 * W3C Candidate Recommendation 7 June 2000
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 * http://www.w3.org/TR/2000/CR-xptr-20000607
 *
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 * Added support for the element() scheme described in:
 * W3C Proposed Recommendation 13 November 2002
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 * http://www.w3.org/TR/2002/PR-xptr-element-20021113/
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 *
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 * See Copyright for the status of this software.
 *
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 * daniel@veillard.com
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 */

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/* To avoid EBCDIC trouble when parsing on zOS */
#if defined(__MVS__)
#pragma convert("ISO8859-1")
#endif

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#define IN_LIBXML
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#include "libxml.h"
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/*
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 * TODO: better handling of error cases, the full expression should
 *       be parsed beforehand instead of a progressive evaluation
 * TODO: Access into entities references are not supported now ...
 *       need a start to be able to pop out of entities refs since
 *       parent is the endity declaration, not the ref.
 */

#include <string.h>
#include <libxml/xpointer.h>
#include <libxml/xmlmemory.h>
#include <libxml/parserInternals.h>
#include <libxml/uri.h>
#include <libxml/xpath.h>
#include <libxml/xpathInternals.h>
#include <libxml/xmlerror.h>
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#include <libxml/globals.h>
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#ifdef LIBXML_XPTR_ENABLED

/* Add support of the xmlns() xpointer scheme to initialize the namespaces */
#define XPTR_XMLNS_SCHEME

/* #define DEBUG_RANGES */
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#ifdef DEBUG_RANGES
#ifdef LIBXML_DEBUG_ENABLED
#include <libxml/debugXML.h>
#endif
#endif
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#define TODO								\
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    xmlGenericError(xmlGenericErrorContext,				\
	    "Unimplemented block at %s:%d\n",				\
            __FILE__, __LINE__);

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#define STRANGE							\
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    xmlGenericError(xmlGenericErrorContext,				\
	    "Internal error at %s:%d\n",				\
            __FILE__, __LINE__);

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/************************************************************************
 *									*
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 *		Some factorized error routines				*
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 *									*
 ************************************************************************/

/**
 * xmlXPtrErrMemory:
 * @extra:  extra informations
 *
 * Handle a redefinition of attribute error
 */
static void
xmlXPtrErrMemory(const char *extra)
{
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    __xmlRaiseError(NULL, NULL, NULL, NULL, NULL, XML_FROM_XPOINTER,
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		    XML_ERR_NO_MEMORY, XML_ERR_ERROR, NULL, 0, extra,
		    NULL, NULL, 0, 0,
		    "Memory allocation failed : %s\n", extra);
}

/**
 * xmlXPtrErr:
 * @ctxt:  an XPTR evaluation context
 * @extra:  extra informations
 *
 * Handle a redefinition of attribute error
 */
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static void LIBXML_ATTR_FORMAT(3,0)
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xmlXPtrErr(xmlXPathParserContextPtr ctxt, int error,
           const char * msg, const xmlChar *extra)
{
    if (ctxt != NULL)
        ctxt->error = error;
    if ((ctxt == NULL) || (ctxt->context == NULL)) {
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	__xmlRaiseError(NULL, NULL, NULL,
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			NULL, NULL, XML_FROM_XPOINTER, error,
			XML_ERR_ERROR, NULL, 0,
			(const char *) extra, NULL, NULL, 0, 0,
			msg, extra);
	return;
    }
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    /* cleanup current last error */
    xmlResetError(&ctxt->context->lastError);

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    ctxt->context->lastError.domain = XML_FROM_XPOINTER;
    ctxt->context->lastError.code = error;
    ctxt->context->lastError.level = XML_ERR_ERROR;
    ctxt->context->lastError.str1 = (char *) xmlStrdup(ctxt->base);
    ctxt->context->lastError.int1 = ctxt->cur - ctxt->base;
    ctxt->context->lastError.node = ctxt->context->debugNode;
    if (ctxt->context->error != NULL) {
	ctxt->context->error(ctxt->context->userData,
	                     &ctxt->context->lastError);
    } else {
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	__xmlRaiseError(NULL, NULL, NULL,
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			NULL, ctxt->context->debugNode, XML_FROM_XPOINTER,
			error, XML_ERR_ERROR, NULL, 0,
			(const char *) extra, (const char *) ctxt->base, NULL,
			ctxt->cur - ctxt->base, 0,
			msg, extra);
    }
}

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/************************************************************************
 *									*
 *		A few helper functions for child sequences		*
 *									*
 ************************************************************************/
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/* xmlXPtrAdvanceNode is a private function, but used by xinclude.c */
xmlNodePtr xmlXPtrAdvanceNode(xmlNodePtr cur, int *level);
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/**
 * xmlXPtrGetArity:
 * @cur:  the node
 *
 * Returns the number of child for an element, -1 in case of error
 */
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static int
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xmlXPtrGetArity(xmlNodePtr cur) {
    int i;
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    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL))
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	return(-1);
    cur = cur->children;
    for (i = 0;cur != NULL;cur = cur->next) {
	if ((cur->type == XML_ELEMENT_NODE) ||
	    (cur->type == XML_DOCUMENT_NODE) ||
	    (cur->type == XML_HTML_DOCUMENT_NODE)) {
	    i++;
	}
    }
    return(i);
}

/**
 * xmlXPtrGetIndex:
 * @cur:  the node
 *
 * Returns the index of the node in its parent children list, -1
 *         in case of error
 */
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static int
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xmlXPtrGetIndex(xmlNodePtr cur) {
    int i;
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    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL))
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	return(-1);
    for (i = 1;cur != NULL;cur = cur->prev) {
	if ((cur->type == XML_ELEMENT_NODE) ||
	    (cur->type == XML_DOCUMENT_NODE) ||
	    (cur->type == XML_HTML_DOCUMENT_NODE)) {
	    i++;
	}
    }
    return(i);
}

/**
 * xmlXPtrGetNthChild:
 * @cur:  the node
 * @no:  the child number
 *
 * Returns the @no'th element child of @cur or NULL
 */
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static xmlNodePtr
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xmlXPtrGetNthChild(xmlNodePtr cur, int no) {
    int i;
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    if ((cur == NULL) || (cur->type == XML_NAMESPACE_DECL))
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	return(cur);
    cur = cur->children;
    for (i = 0;i <= no;cur = cur->next) {
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	if (cur == NULL)
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	    return(cur);
	if ((cur->type == XML_ELEMENT_NODE) ||
	    (cur->type == XML_DOCUMENT_NODE) ||
	    (cur->type == XML_HTML_DOCUMENT_NODE)) {
	    i++;
	    if (i == no)
		break;
	}
    }
    return(cur);
}

/************************************************************************
 *									*
 *		Handling of XPointer specific types			*
 *									*
 ************************************************************************/

/**
 * xmlXPtrCmpPoints:
 * @node1:  the first node
 * @index1:  the first index
 * @node2:  the second node
 * @index2:  the second index
 *
 * Compare two points w.r.t document order
 *
 * Returns -2 in case of error 1 if first point < second point, 0 if
 *         that's the same point, -1 otherwise
 */
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static int
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xmlXPtrCmpPoints(xmlNodePtr node1, int index1, xmlNodePtr node2, int index2) {
    if ((node1 == NULL) || (node2 == NULL))
	return(-2);
    /*
     * a couple of optimizations which will avoid computations in most cases
     */
    if (node1 == node2) {
	if (index1 < index2)
	    return(1);
	if (index1 > index2)
	    return(-1);
	return(0);
    }
    return(xmlXPathCmpNodes(node1, node2));
}

/**
 * xmlXPtrNewPoint:
 * @node:  the xmlNodePtr
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 * @indx:  the indx within the node
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 *
 * Create a new xmlXPathObjectPtr of type point
 *
 * Returns the newly created object.
 */
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static xmlXPathObjectPtr
xmlXPtrNewPoint(xmlNodePtr node, int indx) {
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    xmlXPathObjectPtr ret;

    if (node == NULL)
	return(NULL);
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    if (indx < 0)
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	return(NULL);

    ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
    if (ret == NULL) {
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        xmlXPtrErrMemory("allocating point");
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	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
    ret->type = XPATH_POINT;
    ret->user = (void *) node;
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    ret->index = indx;
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    return(ret);
}

/**
 * xmlXPtrRangeCheckOrder:
 * @range:  an object range
 *
 * Make sure the points in the range are in the right order
 */
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static void
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xmlXPtrRangeCheckOrder(xmlXPathObjectPtr range) {
    int tmp;
    xmlNodePtr tmp2;
    if (range == NULL)
	return;
    if (range->type != XPATH_RANGE)
	return;
    if (range->user2 == NULL)
	return;
    tmp = xmlXPtrCmpPoints(range->user, range->index,
	                     range->user2, range->index2);
    if (tmp == -1) {
	tmp2 = range->user;
	range->user = range->user2;
	range->user2 = tmp2;
	tmp = range->index;
	range->index = range->index2;
	range->index2 = tmp;
    }
}

/**
 * xmlXPtrRangesEqual:
 * @range1:  the first range
 * @range2:  the second range
 *
 * Compare two ranges
 *
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 * Returns 1 if equal, 0 otherwise
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 */
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static int
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xmlXPtrRangesEqual(xmlXPathObjectPtr range1, xmlXPathObjectPtr range2) {
    if (range1 == range2)
	return(1);
    if ((range1 == NULL) || (range2 == NULL))
	return(0);
    if (range1->type != range2->type)
	return(0);
    if (range1->type != XPATH_RANGE)
	return(0);
    if (range1->user != range2->user)
	return(0);
    if (range1->index != range2->index)
	return(0);
    if (range1->user2 != range2->user2)
	return(0);
    if (range1->index2 != range2->index2)
	return(0);
    return(1);
}

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/**
 * xmlXPtrNewRangeInternal:
 * @start:  the starting node
 * @startindex:  the start index
 * @end:  the ending point
 * @endindex:  the ending index
 *
 * Internal function to create a new xmlXPathObjectPtr of type range
 *
 * Returns the newly created object.
 */
static xmlXPathObjectPtr
xmlXPtrNewRangeInternal(xmlNodePtr start, int startindex,
                        xmlNodePtr end, int endindex) {
    xmlXPathObjectPtr ret;

    /*
     * Namespace nodes must be copied (see xmlXPathNodeSetDupNs).
     * Disallow them for now.
     */
    if ((start != NULL) && (start->type == XML_NAMESPACE_DECL))
	return(NULL);
    if ((end != NULL) && (end->type == XML_NAMESPACE_DECL))
	return(NULL);

    ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
    if (ret == NULL) {
        xmlXPtrErrMemory("allocating range");
	return(NULL);
    }
    memset(ret, 0, sizeof(xmlXPathObject));
    ret->type = XPATH_RANGE;
    ret->user = start;
    ret->index = startindex;
    ret->user2 = end;
    ret->index2 = endindex;
    return(ret);
}

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/**
 * xmlXPtrNewRange:
 * @start:  the starting node
 * @startindex:  the start index
 * @end:  the ending point
 * @endindex:  the ending index
 *
 * Create a new xmlXPathObjectPtr of type range
 *
 * Returns the newly created object.
 */
xmlXPathObjectPtr
xmlXPtrNewRange(xmlNodePtr start, int startindex,
	        xmlNodePtr end, int endindex) {
    xmlXPathObjectPtr ret;

    if (start == NULL)
	return(NULL);
    if (end == NULL)
	return(NULL);
    if (startindex < 0)
	return(NULL);
    if (endindex < 0)
	return(NULL);

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    ret = xmlXPtrNewRangeInternal(start, startindex, end, endindex);
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    xmlXPtrRangeCheckOrder(ret);
    return(ret);
}

/**
 * xmlXPtrNewRangePoints:
 * @start:  the starting point
 * @end:  the ending point
 *
 * Create a new xmlXPathObjectPtr of type range using 2 Points
 *
 * Returns the newly created object.
 */
xmlXPathObjectPtr
xmlXPtrNewRangePoints(xmlXPathObjectPtr start, xmlXPathObjectPtr end) {
    xmlXPathObjectPtr ret;

    if (start == NULL)
	return(NULL);
    if (end == NULL)
	return(NULL);
    if (start->type != XPATH_POINT)
	return(NULL);
    if (end->type != XPATH_POINT)
	return(NULL);

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    ret = xmlXPtrNewRangeInternal(start->user, start->index, end->user,
                                  end->index);
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    xmlXPtrRangeCheckOrder(ret);
    return(ret);
}

/**
 * xmlXPtrNewRangePointNode:
 * @start:  the starting point
 * @end:  the ending node
 *
 * Create a new xmlXPathObjectPtr of type range from a point to a node
 *
 * Returns the newly created object.
 */
xmlXPathObjectPtr
xmlXPtrNewRangePointNode(xmlXPathObjectPtr start, xmlNodePtr end) {
    xmlXPathObjectPtr ret;

    if (start == NULL)
	return(NULL);
    if (end == NULL)
	return(NULL);
    if (start->type != XPATH_POINT)
	return(NULL);

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    ret = xmlXPtrNewRangeInternal(start->user, start->index, end, -1);
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    xmlXPtrRangeCheckOrder(ret);
    return(ret);
}

/**
 * xmlXPtrNewRangeNodePoint:
 * @start:  the starting node
 * @end:  the ending point
 *
 * Create a new xmlXPathObjectPtr of type range from a node to a point
 *
 * Returns the newly created object.
 */
xmlXPathObjectPtr
xmlXPtrNewRangeNodePoint(xmlNodePtr start, xmlXPathObjectPtr end) {
    xmlXPathObjectPtr ret;

    if (start == NULL)
	return(NULL);
    if (end == NULL)
	return(NULL);
    if (end->type != XPATH_POINT)
	return(NULL);

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    ret = xmlXPtrNewRangeInternal(start, -1, end->user, end->index);
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    xmlXPtrRangeCheckOrder(ret);
    return(ret);
}

/**
 * xmlXPtrNewRangeNodes:
 * @start:  the starting node
 * @end:  the ending node
 *
 * Create a new xmlXPathObjectPtr of type range using 2 nodes
 *
 * Returns the newly created object.
 */
xmlXPathObjectPtr
xmlXPtrNewRangeNodes(xmlNodePtr start, xmlNodePtr end) {
    xmlXPathObjectPtr ret;

    if (start == NULL)
	return(NULL);
    if (end == NULL)
	return(NULL);

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    ret = xmlXPtrNewRangeInternal(start, -1, end, -1);
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    xmlXPtrRangeCheckOrder(ret);
    return(ret);
}

/**
 * xmlXPtrNewCollapsedRange:
 * @start:  the starting and ending node
 *
 * Create a new xmlXPathObjectPtr of type range using a single nodes
 *
 * Returns the newly created object.
 */
xmlXPathObjectPtr
xmlXPtrNewCollapsedRange(xmlNodePtr start) {
    xmlXPathObjectPtr ret;

    if (start == NULL)
	return(NULL);

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    ret = xmlXPtrNewRangeInternal(start, -1, NULL, -1);
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    return(ret);
}

/**
 * xmlXPtrNewRangeNodeObject:
 * @start:  the starting node
 * @end:  the ending object
 *
 * Create a new xmlXPathObjectPtr of type range from a not to an object
 *
 * Returns the newly created object.
 */
xmlXPathObjectPtr
xmlXPtrNewRangeNodeObject(xmlNodePtr start, xmlXPathObjectPtr end) {
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    xmlNodePtr endNode;
    int endIndex;
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    xmlXPathObjectPtr ret;

    if (start == NULL)
	return(NULL);
    if (end == NULL)
	return(NULL);
    switch (end->type) {
	case XPATH_POINT:
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	    endNode = end->user;
	    endIndex = end->index;
	    break;
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	case XPATH_RANGE:
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	    endNode = end->user2;
	    endIndex = end->index2;
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	    break;
	case XPATH_NODESET:
	    /*
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	     * Empty set ...
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	     */
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	    if ((end->nodesetval == NULL) || (end->nodesetval->nodeNr <= 0))
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		return(NULL);
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	    endNode = end->nodesetval->nodeTab[end->nodesetval->nodeNr - 1];
	    endIndex = -1;
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	    break;
	default:
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	    /* TODO */
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	    return(NULL);
    }

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    ret = xmlXPtrNewRangeInternal(start, -1, endNode, endIndex);
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    xmlXPtrRangeCheckOrder(ret);
    return(ret);
}

#define XML_RANGESET_DEFAULT	10

/**
 * xmlXPtrLocationSetCreate:
 * @val:  an initial xmlXPathObjectPtr, or NULL
 *
 * Create a new xmlLocationSetPtr of type double and of value @val
 *
 * Returns the newly created object.
 */
xmlLocationSetPtr
xmlXPtrLocationSetCreate(xmlXPathObjectPtr val) {
    xmlLocationSetPtr ret;

    ret = (xmlLocationSetPtr) xmlMalloc(sizeof(xmlLocationSet));
    if (ret == NULL) {
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        xmlXPtrErrMemory("allocating locationset");
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	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlLocationSet));
    if (val != NULL) {
        ret->locTab = (xmlXPathObjectPtr *) xmlMalloc(XML_RANGESET_DEFAULT *
					     sizeof(xmlXPathObjectPtr));
	if (ret->locTab == NULL) {
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	    xmlXPtrErrMemory("allocating locationset");
	    xmlFree(ret);
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	    return(NULL);
	}
	memset(ret->locTab, 0 ,
	       XML_RANGESET_DEFAULT * (size_t) sizeof(xmlXPathObjectPtr));
        ret->locMax = XML_RANGESET_DEFAULT;
	ret->locTab[ret->locNr++] = val;
    }
    return(ret);
}

/**
 * xmlXPtrLocationSetAdd:
 * @cur:  the initial range set
 * @val:  a new xmlXPathObjectPtr
 *
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 * add a new xmlXPathObjectPtr to an existing LocationSet
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 * If the location already exist in the set @val is freed.
 */
void
xmlXPtrLocationSetAdd(xmlLocationSetPtr cur, xmlXPathObjectPtr val) {
    int i;

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    if ((cur == NULL) || (val == NULL)) return;
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    /*
     * check against doublons
     */
    for (i = 0;i < cur->locNr;i++) {
	if (xmlXPtrRangesEqual(cur->locTab[i], val)) {
	    xmlXPathFreeObject(val);
	    return;
	}
    }

    /*
     * grow the locTab if needed
     */
    if (cur->locMax == 0) {
        cur->locTab = (xmlXPathObjectPtr *) xmlMalloc(XML_RANGESET_DEFAULT *
					     sizeof(xmlXPathObjectPtr));
	if (cur->locTab == NULL) {
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	    xmlXPtrErrMemory("adding location to set");
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	    return;
	}
	memset(cur->locTab, 0 ,
	       XML_RANGESET_DEFAULT * (size_t) sizeof(xmlXPathObjectPtr));
        cur->locMax = XML_RANGESET_DEFAULT;
    } else if (cur->locNr == cur->locMax) {
        xmlXPathObjectPtr *temp;

        cur->locMax *= 2;
	temp = (xmlXPathObjectPtr *) xmlRealloc(cur->locTab, cur->locMax *
				      sizeof(xmlXPathObjectPtr));
	if (temp == NULL) {
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	    xmlXPtrErrMemory("adding location to set");
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	    return;
	}
	cur->locTab = temp;
    }
    cur->locTab[cur->locNr++] = val;
}

/**
 * xmlXPtrLocationSetMerge:
 * @val1:  the first LocationSet
 * @val2:  the second LocationSet
 *
 * Merges two rangesets, all ranges from @val2 are added to @val1
 *
 * Returns val1 once extended or NULL in case of error.
 */
xmlLocationSetPtr
xmlXPtrLocationSetMerge(xmlLocationSetPtr val1, xmlLocationSetPtr val2) {
    int i;

    if (val1 == NULL) return(NULL);
    if (val2 == NULL) return(val1);

    /*
     * !!!!! this can be optimized a lot, knowing that both
     *       val1 and val2 already have unicity of their values.
     */

    for (i = 0;i < val2->locNr;i++)
        xmlXPtrLocationSetAdd(val1, val2->locTab[i]);

    return(val1);
}

/**
 * xmlXPtrLocationSetDel:
 * @cur:  the initial range set
 * @val:  an xmlXPathObjectPtr
 *
 * Removes an xmlXPathObjectPtr from an existing LocationSet
 */
void
xmlXPtrLocationSetDel(xmlLocationSetPtr cur, xmlXPathObjectPtr val) {
    int i;

    if (cur == NULL) return;
    if (val == NULL) return;

    /*
     * check against doublons
     */
    for (i = 0;i < cur->locNr;i++)
        if (cur->locTab[i] == val) break;

    if (i >= cur->locNr) {
#ifdef DEBUG
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        xmlGenericError(xmlGenericErrorContext,
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	        "xmlXPtrLocationSetDel: Range wasn't found in RangeList\n");
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#endif
        return;
    }
    cur->locNr--;
    for (;i < cur->locNr;i++)
        cur->locTab[i] = cur->locTab[i + 1];
    cur->locTab[cur->locNr] = NULL;
}

/**
 * xmlXPtrLocationSetRemove:
 * @cur:  the initial range set
 * @val:  the index to remove
 *
 * Removes an entry from an existing LocationSet list.
 */
void
xmlXPtrLocationSetRemove(xmlLocationSetPtr cur, int val) {
    if (cur == NULL) return;
    if (val >= cur->locNr) return;
    cur->locNr--;
    for (;val < cur->locNr;val++)
        cur->locTab[val] = cur->locTab[val + 1];
    cur->locTab[cur->locNr] = NULL;
}

/**
 * xmlXPtrFreeLocationSet:
 * @obj:  the xmlLocationSetPtr to free
 *
 * Free the LocationSet compound (not the actual ranges !).
 */
void
xmlXPtrFreeLocationSet(xmlLocationSetPtr obj) {
    int i;

    if (obj == NULL) return;
    if (obj->locTab != NULL) {
	for (i = 0;i < obj->locNr; i++) {
            xmlXPathFreeObject(obj->locTab[i]);
	}
	xmlFree(obj->locTab);
    }
    xmlFree(obj);
}

/**
 * xmlXPtrNewLocationSetNodes:
 * @start:  the start NodePtr value
 * @end:  the end NodePtr value or NULL
 *
 * Create a new xmlXPathObjectPtr of type LocationSet and initialize
 * it with the single range made of the two nodes @start and @end
 *
 * Returns the newly created object.
 */
xmlXPathObjectPtr
xmlXPtrNewLocationSetNodes(xmlNodePtr start, xmlNodePtr end) {
    xmlXPathObjectPtr ret;

    ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
    if (ret == NULL) {
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        xmlXPtrErrMemory("allocating locationset");
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	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
    ret->type = XPATH_LOCATIONSET;
    if (end == NULL)
	ret->user = xmlXPtrLocationSetCreate(xmlXPtrNewCollapsedRange(start));
    else
	ret->user = xmlXPtrLocationSetCreate(xmlXPtrNewRangeNodes(start,end));
    return(ret);
}

/**
 * xmlXPtrNewLocationSetNodeSet:
 * @set:  a node set
 *
 * Create a new xmlXPathObjectPtr of type LocationSet and initialize
 * it with all the nodes from @set
 *
 * Returns the newly created object.
 */
xmlXPathObjectPtr
xmlXPtrNewLocationSetNodeSet(xmlNodeSetPtr set) {
    xmlXPathObjectPtr ret;

    ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
    if (ret == NULL) {
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        xmlXPtrErrMemory("allocating locationset");
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	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
    ret->type = XPATH_LOCATIONSET;
    if (set != NULL) {
	int i;
	xmlLocationSetPtr newset;

	newset = xmlXPtrLocationSetCreate(NULL);
	if (newset == NULL)
	    return(ret);

	for (i = 0;i < set->nodeNr;i++)
	    xmlXPtrLocationSetAdd(newset,
		        xmlXPtrNewCollapsedRange(set->nodeTab[i]));

	ret->user = (void *) newset;
    }
    return(ret);
}

/**
 * xmlXPtrWrapLocationSet:
 * @val:  the LocationSet value
 *
 * Wrap the LocationSet @val in a new xmlXPathObjectPtr
 *
 * Returns the newly created object.
 */
xmlXPathObjectPtr
xmlXPtrWrapLocationSet(xmlLocationSetPtr val) {
    xmlXPathObjectPtr ret;

    ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
    if (ret == NULL) {
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        xmlXPtrErrMemory("allocating locationset");
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	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
    ret->type = XPATH_LOCATIONSET;
    ret->user = (void *) val;
    return(ret);
}

/************************************************************************
 *									*
 *			The parser					*
 *									*
 ************************************************************************/

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static void xmlXPtrEvalChildSeq(xmlXPathParserContextPtr ctxt, xmlChar *name);

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/*
 * Macros for accessing the content. Those should be used only by the parser,
 * and not exported.
 *
 * Dirty macros, i.e. one need to make assumption on the context to use them
 *
 *   CUR_PTR return the current pointer to the xmlChar to be parsed.
 *   CUR     returns the current xmlChar value, i.e. a 8 bit value
 *           in ISO-Latin or UTF-8.
 *           This should be used internally by the parser
 *           only to compare to ASCII values otherwise it would break when
 *           running with UTF-8 encoding.
 *   NXT(n)  returns the n'th next xmlChar. Same as CUR is should be used only
 *           to compare on ASCII based substring.
 *   SKIP(n) Skip n xmlChar, and must also be used only to skip ASCII defined
 *           strings within the parser.
 *   CURRENT Returns the current char value, with the full decoding of
 *           UTF-8 if we are using this mode. It returns an int.
 *   NEXT    Skip to the next character, this does the proper decoding
 *           in UTF-8 mode. It also pop-up unfinished entities on the fly.
 *           It returns the pointer to the current xmlChar.
 */

#define CUR (*ctxt->cur)
#define SKIP(val) ctxt->cur += (val)
#define NXT(val) ctxt->cur[(val)]
#define CUR_PTR ctxt->cur

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#define SKIP_BLANKS							\
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    while (IS_BLANK_CH(*(ctxt->cur))) NEXT
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#define CURRENT (*ctxt->cur)
#define NEXT ((*ctxt->cur) ?  ctxt->cur++: ctxt->cur)

/*
 * xmlXPtrGetChildNo:
 * @ctxt:  the XPointer Parser context
 * @index:  the child number
 *
 * Move the current node of the nodeset on the stack to the
 * given child if found
 */
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static void
xmlXPtrGetChildNo(xmlXPathParserContextPtr ctxt, int indx) {
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    xmlNodePtr cur = NULL;
    xmlXPathObjectPtr obj;
    xmlNodeSetPtr oldset;

    CHECK_TYPE(XPATH_NODESET);
    obj = valuePop(ctxt);
    oldset = obj->nodesetval;
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    if ((indx <= 0) || (oldset == NULL) || (oldset->nodeNr != 1)) {
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	xmlXPathFreeObject(obj);
	valuePush(ctxt, xmlXPathNewNodeSet(NULL));
	return;
    }
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    cur = xmlXPtrGetNthChild(oldset->nodeTab[0], indx);
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    if (cur == NULL) {
	xmlXPathFreeObject(obj);
	valuePush(ctxt, xmlXPathNewNodeSet(NULL));
	return;
    }
    oldset->nodeTab[0] = cur;
    valuePush(ctxt, obj);
}

/**
 * xmlXPtrEvalXPtrPart:
 * @ctxt:  the XPointer Parser context
 * @name:  the preparsed Scheme for the XPtrPart
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 *
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 * XPtrPart ::= 'xpointer' '(' XPtrExpr ')'
 *            | Scheme '(' SchemeSpecificExpr ')'
 *
 * Scheme   ::=  NCName - 'xpointer' [VC: Non-XPointer schemes]
 *
 * SchemeSpecificExpr ::= StringWithBalancedParens
 *
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 * StringWithBalancedParens ::=
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 *              [^()]* ('(' StringWithBalancedParens ')' [^()]*)*
 *              [VC: Parenthesis escaping]
 *
 * XPtrExpr ::= Expr [VC: Parenthesis escaping]
 *
 * VC: Parenthesis escaping:
 *   The end of an XPointer part is signaled by the right parenthesis ")"
 *   character that is balanced with the left parenthesis "(" character
 *   that began the part. Any unbalanced parenthesis character inside the
 *   expression, even within literals, must be escaped with a circumflex (^)
 *   character preceding it. If the expression contains any literal
 *   occurrences of the circumflex, each must be escaped with an additional
 *   circumflex (that is, ^^). If the unescaped parentheses in the expression
 *   are not balanced, a syntax error results.
 *
 * Parse and evaluate an XPtrPart. Basically it generates the unescaped
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 * string and if the scheme is 'xpointer' it will call the XPath interpreter.
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 *
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 * TODO: there is no new scheme registration mechanism
 */

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static void
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xmlXPtrEvalXPtrPart(xmlXPathParserContextPtr ctxt, xmlChar *name) {
    xmlChar *buffer, *cur;
    int len;
    int level;

    if (name == NULL)
    name = xmlXPathParseName(ctxt);
    if (name == NULL)
	XP_ERROR(XPATH_EXPR_ERROR);

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    if (CUR != '(') {
        xmlFree(name);
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	XP_ERROR(XPATH_EXPR_ERROR);
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    }
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    NEXT;
    level = 1;

    len = xmlStrlen(ctxt->cur);
    len++;
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    buffer = (xmlChar *) xmlMallocAtomic(len * sizeof (xmlChar));
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    if (buffer == NULL) {
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        xmlXPtrErrMemory("allocating buffer");
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        xmlFree(name);
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	return;
    }

    cur = buffer;
    while (CUR != 0) {
	if (CUR == ')') {
	    level--;
	    if (level == 0) {
		NEXT;
		break;
	    }
	} else if (CUR == '(') {
	    level++;
	} else if (CUR == '^') {
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            if ((NXT(1) == ')') || (NXT(1) == '(') || (NXT(1) == '^')) {
                NEXT;
            }
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	}
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        *cur++ = CUR;
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	NEXT;
    }
    *cur = 0;

    if ((level != 0) && (CUR == 0)) {
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        xmlFree(name);
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	xmlFree(buffer);
	XP_ERROR(XPTR_SYNTAX_ERROR);
    }

    if (xmlStrEqual(name, (xmlChar *) "xpointer")) {
	const xmlChar *left = CUR_PTR;

	CUR_PTR = buffer;
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	/*
	 * To evaluate an xpointer scheme element (4.3) we need:
	 *   context initialized to the root
	 *   context position initalized to 1
	 *   context size initialized to 1
	 */
	ctxt->context->node = (xmlNodePtr)ctxt->context->doc;
	ctxt->context->proximityPosition = 1;
	ctxt->context->contextSize = 1;
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	xmlXPathEvalExpr(ctxt);
	CUR_PTR=left;
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    } else if (xmlStrEqual(name, (xmlChar *) "element")) {
	const xmlChar *left = CUR_PTR;
	xmlChar *name2;

	CUR_PTR = buffer;
	if (buffer[0] == '/') {
	    xmlXPathRoot(ctxt);
	    xmlXPtrEvalChildSeq(ctxt, NULL);
	} else {
	    name2 = xmlXPathParseName(ctxt);
	    if (name2 == NULL) {
		CUR_PTR = left;
		xmlFree(buffer);
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                xmlFree(name);
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		XP_ERROR(XPATH_EXPR_ERROR);
	    }
	    xmlXPtrEvalChildSeq(ctxt, name2);
	}
	CUR_PTR = left;
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#ifdef XPTR_XMLNS_SCHEME
    } else if (xmlStrEqual(name, (xmlChar *) "xmlns")) {
	const xmlChar *left = CUR_PTR;
	xmlChar *prefix;
	xmlChar *URI;
	xmlURIPtr value;

	CUR_PTR = buffer;
        prefix = xmlXPathParseNCName(ctxt);
	if (prefix == NULL) {
	    xmlFree(buffer);
	    xmlFree(name);
	    XP_ERROR(XPTR_SYNTAX_ERROR);
	}
	SKIP_BLANKS;
	if (CUR != '=') {
	    xmlFree(prefix);
	    xmlFree(buffer);
	    xmlFree(name);
	    XP_ERROR(XPTR_SYNTAX_ERROR);
	}
	NEXT;
	SKIP_BLANKS;
	/* @@ check escaping in the XPointer WD */

	value = xmlParseURI((const char *)ctxt->cur);
	if (value == NULL) {
	    xmlFree(prefix);
	    xmlFree(buffer);
	    xmlFree(name);
	    XP_ERROR(XPTR_SYNTAX_ERROR);
	}
	URI = xmlSaveUri(value);
	xmlFreeURI(value);
	if (URI == NULL) {
	    xmlFree(prefix);
	    xmlFree(buffer);
	    xmlFree(name);
	    XP_ERROR(XPATH_MEMORY_ERROR);
	}
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	xmlXPathRegisterNs(ctxt->context, prefix, URI);
	CUR_PTR = left;
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	xmlFree(URI);
	xmlFree(prefix);
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#endif /* XPTR_XMLNS_SCHEME */
    } else {
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        xmlXPtrErr(ctxt, XML_XPTR_UNKNOWN_SCHEME,
		   "unsupported scheme '%s'\n", name);
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    }
    xmlFree(buffer);
    xmlFree(name);
}

/**
 * xmlXPtrEvalFullXPtr:
 * @ctxt:  the XPointer Parser context
 * @name:  the preparsed Scheme for the first XPtrPart
 *
 * FullXPtr ::= XPtrPart (S? XPtrPart)*
 *
 * As the specs says:
 * -----------
 * When multiple XPtrParts are provided, they must be evaluated in
 * left-to-right order. If evaluation of one part fails, the nexti
 * is evaluated. The following conditions cause XPointer part failure:
 *
 * - An unknown scheme
 * - A scheme that does not locate any sub-resource present in the resource
 * - A scheme that is not applicable to the media type of the resource
 *
 * The XPointer application must consume a failed XPointer part and
 * attempt to evaluate the next one, if any. The result of the first
 * XPointer part whose evaluation succeeds is taken to be the fragment
 * located by the XPointer as a whole. If all the parts fail, the result
 * for the XPointer as a whole is a sub-resource error.
 * -----------
 *
 * Parse and evaluate a Full XPtr i.e. possibly a cascade of XPath based
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 * expressions or other schemes.
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 */
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static void
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xmlXPtrEvalFullXPtr(xmlXPathParserContextPtr ctxt, xmlChar *name) {
    if (name == NULL)
    name = xmlXPathParseName(ctxt);
    if (name == NULL)
	XP_ERROR(XPATH_EXPR_ERROR);
    while (name != NULL) {
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	ctxt->error = XPATH_EXPRESSION_OK;
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	xmlXPtrEvalXPtrPart(ctxt, name);

	/* in case of syntax error, break here */
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	if ((ctxt->error != XPATH_EXPRESSION_OK) &&
            (ctxt->error != XML_XPTR_UNKNOWN_SCHEME))
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	    return;

	/*
	 * If the returned value is a non-empty nodeset
	 * or location set, return here.
	 */
	if (ctxt->value != NULL) {
	    xmlXPathObjectPtr obj = ctxt->value;

	    switch (obj->type) {
		case XPATH_LOCATIONSET: {
		    xmlLocationSetPtr loc = ctxt->value->user;
		    if ((loc != NULL) && (loc->locNr > 0))
			return;
		    break;
		}
		case XPATH_NODESET: {
		    xmlNodeSetPtr loc = ctxt->value->nodesetval;
		    if ((loc != NULL) && (loc->nodeNr > 0))
			return;
		    break;
		}
		default:
		    break;
	    }

	    /*
	     * Evaluating to improper values is equivalent to
	     * a sub-resource error, clean-up the stack
	     */
	    do {
		obj = valuePop(ctxt);
		if (obj != NULL) {
		    xmlXPathFreeObject(obj);
		}
	    } while (obj != NULL);
	}

	/*
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	 * Is there another XPointer part.
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	 */
	SKIP_BLANKS;
	name = xmlXPathParseName(ctxt);
    }
}

/**
 * xmlXPtrEvalChildSeq:
 * @ctxt:  the XPointer Parser context
 * @name:  a possible ID name of the child sequence
 *
 *  ChildSeq ::= '/1' ('/' [0-9]*)*
 *             | Name ('/' [0-9]*)+
 *
 * Parse and evaluate a Child Sequence. This routine also handle the
 * case of a Bare Name used to get a document ID.
 */
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static void
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xmlXPtrEvalChildSeq(xmlXPathParserContextPtr ctxt, xmlChar *name) {
    /*
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     * XPointer don't allow by syntax to address in mutirooted trees
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     * this might prove useful in some cases, warn about it.
     */
    if ((name == NULL) && (CUR == '/') && (NXT(1) != '1')) {
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        xmlXPtrErr(ctxt, XML_XPTR_CHILDSEQ_START,
		   "warning: ChildSeq not starting by /1\n", NULL);
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    }

    if (name != NULL) {
	valuePush(ctxt, xmlXPathNewString(name));
	xmlFree(name);
	xmlXPathIdFunction(ctxt, 1);
	CHECK_ERROR;
    }

    while (CUR == '/') {
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	int child = 0, overflow = 0;
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	NEXT;
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	while ((CUR >= '0') && (CUR <= '9')) {
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            int d = CUR - '0';
            if (child > INT_MAX / 10)
                overflow = 1;
            else
                child *= 10;
            if (child > INT_MAX - d)
                overflow = 1;
            else
                child += d;
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	    NEXT;
	}
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        if (overflow)
            child = 0;
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	xmlXPtrGetChildNo(ctxt, child);
    }
}


/**
 * xmlXPtrEvalXPointer:
 * @ctxt:  the XPointer Parser context
 *
 *  XPointer ::= Name
 *             | ChildSeq
 *             | FullXPtr
 *
 * Parse and evaluate an XPointer
 */
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static void
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xmlXPtrEvalXPointer(xmlXPathParserContextPtr ctxt) {
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    if (ctxt->valueTab == NULL) {
	/* Allocate the value stack */
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	ctxt->valueTab = (xmlXPathObjectPtr *)
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			 xmlMalloc(10 * sizeof(xmlXPathObjectPtr));
	if (ctxt->valueTab == NULL) {
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	    xmlXPtrErrMemory("allocating evaluation context");
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	    return;
	}
	ctxt->valueNr = 0;
	ctxt->valueMax = 10;
	ctxt->value = NULL;
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	ctxt->valueFrame = 0;
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    }
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    SKIP_BLANKS;
    if (CUR == '/') {
	xmlXPathRoot(ctxt);
        xmlXPtrEvalChildSeq(ctxt, NULL);
    } else {
	xmlChar *name;

	name = xmlXPathParseName(ctxt);
	if (name == NULL)
	    XP_ERROR(XPATH_EXPR_ERROR);
	if (CUR == '(') {
	    xmlXPtrEvalFullXPtr(ctxt, name);
	    /* Short evaluation */
	    return;
	} else {
	    /* this handle both Bare Names and Child Sequences */
	    xmlXPtrEvalChildSeq(ctxt, name);
	}
    }
    SKIP_BLANKS;
    if (CUR != 0)
	XP_ERROR(XPATH_EXPR_ERROR);
}


/************************************************************************
 *									*
 *			General routines				*
 *									*
 ************************************************************************/

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static
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void xmlXPtrStringRangeFunction(xmlXPathParserContextPtr ctxt, int nargs);
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static
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void xmlXPtrStartPointFunction(xmlXPathParserContextPtr ctxt, int nargs);
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static
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void xmlXPtrEndPointFunction(xmlXPathParserContextPtr ctxt, int nargs);
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static
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void xmlXPtrHereFunction(xmlXPathParserContextPtr ctxt, int nargs);
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static
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void xmlXPtrOriginFunction(xmlXPathParserContextPtr ctxt, int nargs);
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static
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void xmlXPtrRangeInsideFunction(xmlXPathParserContextPtr ctxt, int nargs);
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static
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void xmlXPtrRangeFunction(xmlXPathParserContextPtr ctxt, int nargs);

/**
 * xmlXPtrNewContext:
 * @doc:  the XML document
 * @here:  the node that directly contains the XPointer being evaluated or NULL
 * @origin:  the element from which a user or program initiated traversal of
 *           the link, or NULL.
 *
 * Create a new XPointer context
 *
 * Returns the xmlXPathContext just allocated.
 */
xmlXPathContextPtr
xmlXPtrNewContext(xmlDocPtr doc, xmlNodePtr here, xmlNodePtr origin) {
    xmlXPathContextPtr ret;

    ret = xmlXPathNewContext(doc);
    if (ret == NULL)
	return(ret);
    ret->xptr = 1;
    ret->here = here;
    ret->origin = origin;

    xmlXPathRegisterFunc(ret, (xmlChar *)"range",
	                 xmlXPtrRangeFunction);
    xmlXPathRegisterFunc(ret, (xmlChar *)"range-inside",
	                 xmlXPtrRangeInsideFunction);
    xmlXPathRegisterFunc(ret, (xmlChar *)"string-range",
	                 xmlXPtrStringRangeFunction);
    xmlXPathRegisterFunc(ret, (xmlChar *)"start-point",
	                 xmlXPtrStartPointFunction);
    xmlXPathRegisterFunc(ret, (xmlChar *)"end-point",
	                 xmlXPtrEndPointFunction);
    xmlXPathRegisterFunc(ret, (xmlChar *)"here",
	                 xmlXPtrHereFunction);
    xmlXPathRegisterFunc(ret, (xmlChar *)" origin",
	                 xmlXPtrOriginFunction);

    return(ret);
}

/**
 * xmlXPtrEval:
 * @str:  the XPointer expression
 * @ctx:  the XPointer context
 *
 * Evaluate the XPath Location Path in the given context.
 *
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 * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL.
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 *         the caller has to free the object.
 */
xmlXPathObjectPtr
xmlXPtrEval(const xmlChar *str, xmlXPathContextPtr ctx) {
    xmlXPathParserContextPtr ctxt;
    xmlXPathObjectPtr res = NULL, tmp;
    xmlXPathObjectPtr init = NULL;
    int stack = 0;

    xmlXPathInit();

    if ((ctx == NULL) || (str == NULL))
	return(NULL);

    ctxt = xmlXPathNewParserContext(str, ctx);
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Gaurav committed
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    if (ctxt == NULL)
	return(NULL);
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    ctxt->xptr = 1;
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    xmlXPtrEvalXPointer(ctxt);

    if ((ctxt->value != NULL) &&
	(ctxt->value->type != XPATH_NODESET) &&
	(ctxt->value->type != XPATH_LOCATIONSET)) {
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        xmlXPtrErr(ctxt, XML_XPTR_EVAL_FAILED,
		"xmlXPtrEval: evaluation failed to return a node set\n",
		   NULL);
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    } else {
	res = valuePop(ctxt);
    }

    do {
        tmp = valuePop(ctxt);
	if (tmp != NULL) {
	    if (tmp != init) {
		if (tmp->type == XPATH_NODESET) {
		    /*
		     * Evaluation may push a root nodeset which is unused
		     */
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		    xmlNodeSetPtr set;
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		    set = tmp->nodesetval;
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		    if ((set == NULL) || (set->nodeNr != 1) ||
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			(set->nodeTab[0] != (xmlNodePtr) ctx->doc))
			stack++;
		} else
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		    stack++;
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	    }
	    xmlXPathFreeObject(tmp);
        }
    } while (tmp != NULL);
    if (stack != 0) {
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        xmlXPtrErr(ctxt, XML_XPTR_EXTRA_OBJECTS,
		   "xmlXPtrEval: object(s) left on the eval stack\n",
		   NULL);
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    }
    if (ctxt->error != XPATH_EXPRESSION_OK) {
	xmlXPathFreeObject(res);
	res = NULL;
    }
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    xmlXPathFreeParserContext(ctxt);
    return(res);
}

/**
 * xmlXPtrBuildRangeNodeList:
 * @range:  a range object
 *
 * Build a node list tree copy of the range
 *
 * Returns an xmlNodePtr list or NULL.
 *         the caller has to free the node tree.
 */
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static xmlNodePtr
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xmlXPtrBuildRangeNodeList(xmlXPathObjectPtr range) {
    /* pointers to generated nodes */
    xmlNodePtr list = NULL, last = NULL, parent = NULL, tmp;
    /* pointers to traversal nodes */
    xmlNodePtr start, cur, end;
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    int index1, index2;
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    if (range == NULL)
	return(NULL);
    if (range->type != XPATH_RANGE)
	return(NULL);
    start = (xmlNodePtr) range->user;

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    if ((start == NULL) || (start->type == XML_NAMESPACE_DECL))
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	return(NULL);
    end = range->user2;
    if (end == NULL)
	return(xmlCopyNode(start, 1));
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    if (end->type == XML_NAMESPACE_DECL)
        return(NULL);
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    cur = start;
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    index1 = range->index;
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    index2 = range->index2;
    while (cur != NULL) {
	if (cur == end) {
	    if (cur->type == XML_TEXT_NODE) {
		const xmlChar *content = cur->content;
		int len;

		if (content == NULL) {
		    tmp = xmlNewTextLen(NULL, 0);
		} else {
		    len = index2;
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		    if ((cur == start) && (index1 > 1)) {
			content += (index1 - 1);
			len -= (index1 - 1);
			index1 = 0;
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		    } else {
			len = index2;
		    }
		    tmp = xmlNewTextLen(content, len);
		}
		/* single sub text node selection */
		if (list == NULL)
		    return(tmp);
		/* prune and return full set */
		if (last != NULL)
		    xmlAddNextSibling(last, tmp);
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		else
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		    xmlAddChild(parent, tmp);
		return(list);
	    } else {
		tmp = xmlCopyNode(cur, 0);
		if (list == NULL)
		    list = tmp;
		else {
		    if (last != NULL)
			xmlAddNextSibling(last, tmp);
		    else
			xmlAddChild(parent, tmp);
		}
		last = NULL;
		parent = tmp;

		if (index2 > 1) {
		    end = xmlXPtrGetNthChild(cur, index2 - 1);
		    index2 = 0;
		}
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		if ((cur == start) && (index1 > 1)) {
		    cur = xmlXPtrGetNthChild(cur, index1 - 1);
		    index1 = 0;
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		} else {
		    cur = cur->children;
		}
		/*
		 * Now gather the remaining nodes from cur to end
		 */
		continue; /* while */
	    }
	} else if ((cur == start) &&
		   (list == NULL) /* looks superfluous but ... */ ) {
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	    if ((cur->type == XML_TEXT_NODE) ||
		(cur->type == XML_CDATA_SECTION_NODE)) {
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		const xmlChar *content = cur->content;

		if (content == NULL) {
		    tmp = xmlNewTextLen(NULL, 0);
		} else {
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		    if (index1 > 1) {
			content += (index1 - 1);
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		    }
		    tmp = xmlNewText(content);
		}
		last = list = tmp;
	    } else {
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		if ((cur == start) && (index1 > 1)) {
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		    tmp = xmlCopyNode(cur, 0);
		    list = tmp;
		    parent = tmp;
		    last = NULL;
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		    cur = xmlXPtrGetNthChild(cur, index1 - 1);
		    index1 = 0;
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		    /*
		     * Now gather the remaining nodes from cur to end
		     */
		    continue; /* while */
		}
		tmp = xmlCopyNode(cur, 1);
		list = tmp;
		parent = NULL;
		last = tmp;
	    }
	} else {
	    tmp = NULL;
	    switch (cur->type) {
		case XML_DTD_NODE:
		case XML_ELEMENT_DECL:
		case XML_ATTRIBUTE_DECL:
		case XML_ENTITY_NODE:
		    /* Do not copy DTD informations */
		    break;
		case XML_ENTITY_DECL:
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		    TODO /* handle crossing entities -> stack needed */
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		    break;
		case XML_XINCLUDE_START:
		case XML_XINCLUDE_END:
		    /* don't consider it part of the tree content */
		    break;
		case XML_ATTRIBUTE_NODE:
		    /* Humm, should not happen ! */
		    STRANGE
		    break;
		default:
		    tmp = xmlCopyNode(cur, 1);
		    break;
	    }
	    if (tmp != NULL) {
		if ((list == NULL) || ((last == NULL) && (parent == NULL)))  {
		    STRANGE
		    return(NULL);
		}
		if (last != NULL)
		    xmlAddNextSibling(last, tmp);
		else {
		    xmlAddChild(parent, tmp);
		    last = tmp;
		}
	    }
	}
	/*
	 * Skip to next node in document order
	 */
	if ((list == NULL) || ((last == NULL) && (parent == NULL)))  {
	    STRANGE
	    return(NULL);
	}
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	cur = xmlXPtrAdvanceNode(cur, NULL);
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    }
    return(list);
}

/**
 * xmlXPtrBuildNodeList:
 * @obj:  the XPointer result from the evaluation.
 *
 * Build a node list tree copy of the XPointer result.
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 * This will drop Attributes and Namespace declarations.
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 *
 * Returns an xmlNodePtr list or NULL.
 *         the caller has to free the node tree.
 */
xmlNodePtr
xmlXPtrBuildNodeList(xmlXPathObjectPtr obj) {
    xmlNodePtr list = NULL, last = NULL;
    int i;

    if (obj == NULL)
	return(NULL);
    switch (obj->type) {
        case XPATH_NODESET: {
	    xmlNodeSetPtr set = obj->nodesetval;
	    if (set == NULL)
		return(NULL);
	    for (i = 0;i < set->nodeNr;i++) {
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		if (set->nodeTab[i] == NULL)
		    continue;
		switch (set->nodeTab[i]->type) {
		    case XML_TEXT_NODE:
		    case XML_CDATA_SECTION_NODE:
		    case XML_ELEMENT_NODE:
		    case XML_ENTITY_REF_NODE:
		    case XML_ENTITY_NODE:
		    case XML_PI_NODE:
		    case XML_COMMENT_NODE:
		    case XML_DOCUMENT_NODE:
		    case XML_HTML_DOCUMENT_NODE:
#ifdef LIBXML_DOCB_ENABLED
		    case XML_DOCB_DOCUMENT_NODE:
#endif
		    case XML_XINCLUDE_START:
		    case XML_XINCLUDE_END:
			break;
		    case XML_ATTRIBUTE_NODE:
		    case XML_NAMESPACE_DECL:
		    case XML_DOCUMENT_TYPE_NODE:
		    case XML_DOCUMENT_FRAG_NODE:
		    case XML_NOTATION_NODE:
		    case XML_DTD_NODE:
		    case XML_ELEMENT_DECL:
		    case XML_ATTRIBUTE_DECL:
		    case XML_ENTITY_DECL:
			continue; /* for */
		}
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		if (last == NULL)
		    list = last = xmlCopyNode(set->nodeTab[i], 1);
		else {
		    xmlAddNextSibling(last, xmlCopyNode(set->nodeTab[i], 1));
		    if (last->next != NULL)
			last = last->next;
		}
	    }
	    break;
	}
	case XPATH_LOCATIONSET: {
	    xmlLocationSetPtr set = (xmlLocationSetPtr) obj->user;
	    if (set == NULL)
		return(NULL);
	    for (i = 0;i < set->locNr;i++) {
		if (last == NULL)
		    list = last = xmlXPtrBuildNodeList(set->locTab[i]);
		else
		    xmlAddNextSibling(last,
			    xmlXPtrBuildNodeList(set->locTab[i]));
		if (last != NULL) {
		    while (last->next != NULL)
			last = last->next;
		}
	    }
	    break;
	}
	case XPATH_RANGE:
	    return(xmlXPtrBuildRangeNodeList(obj));
	case XPATH_POINT:
	    return(xmlCopyNode(obj->user, 0));
	default:
	    break;
    }
    return(list);
}

/************************************************************************
 *									*
 *			XPointer functions				*
 *									*
 ************************************************************************/

/**
 * xmlXPtrNbLocChildren:
 * @node:  an xmlNodePtr
 *
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 * Count the number of location children of @node or the length of the
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 * string value in case of text/PI/Comments nodes
 *
 * Returns the number of location children
 */
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static int
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xmlXPtrNbLocChildren(xmlNodePtr node) {
    int ret = 0;
    if (node == NULL)
	return(-1);
    switch (node->type) {
        case XML_HTML_DOCUMENT_NODE:
        case XML_DOCUMENT_NODE:
        case XML_ELEMENT_NODE:
	    node = node->children;
	    while (node != NULL) {
		if (node->type == XML_ELEMENT_NODE)
		    ret++;
		node = node->next;
	    }
	    break;
        case XML_ATTRIBUTE_NODE:
	    return(-1);

        case XML_PI_NODE:
        case XML_COMMENT_NODE:
        case XML_TEXT_NODE:
        case XML_CDATA_SECTION_NODE:
        case XML_ENTITY_REF_NODE:
	    ret = xmlStrlen(node->content);
	    break;
	default:
	    return(-1);
    }
    return(ret);
}

/**
 * xmlXPtrHereFunction:
 * @ctxt:  the XPointer Parser context
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 * @nargs:  the number of args
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 *
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 * Function implementing here() operation
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 * as described in 5.4.3
 */
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static void
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xmlXPtrHereFunction(xmlXPathParserContextPtr ctxt, int nargs) {
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    CHECK_ARITY(0);

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    if (ctxt->context->here == NULL)
	XP_ERROR(XPTR_SYNTAX_ERROR);
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    valuePush(ctxt, xmlXPtrNewLocationSetNodes(ctxt->context->here, NULL));
}

/**
 * xmlXPtrOriginFunction:
 * @ctxt:  the XPointer Parser context
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 * @nargs:  the number of args
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 *
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 * Function implementing origin() operation
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 * as described in 5.4.3
 */
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static void
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xmlXPtrOriginFunction(xmlXPathParserContextPtr ctxt, int nargs) {
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    CHECK_ARITY(0);

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    if (ctxt->context->origin == NULL)
	XP_ERROR(XPTR_SYNTAX_ERROR);
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    valuePush(ctxt, xmlXPtrNewLocationSetNodes(ctxt->context->origin, NULL));
}

/**
 * xmlXPtrStartPointFunction:
 * @ctxt:  the XPointer Parser context
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 * @nargs:  the number of args
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 *
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 * Function implementing start-point() operation
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 * as described in 5.4.3
 * ----------------
 * location-set start-point(location-set)
 *
 * For each location x in the argument location-set, start-point adds a
 * location of type point to the result location-set. That point represents
 * the start point of location x and is determined by the following rules:
 *
 * - If x is of type point, the start point is x.
 * - If x is of type range, the start point is the start point of x.
 * - If x is of type root, element, text, comment, or processing instruction,
 * - the container node of the start point is x and the index is 0.
 * - If x is of type attribute or namespace, the function must signal a
 *   syntax error.
 * ----------------
 *
 */
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static void
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xmlXPtrStartPointFunction(xmlXPathParserContextPtr ctxt, int nargs) {
    xmlXPathObjectPtr tmp, obj, point;
    xmlLocationSetPtr newset = NULL;
    xmlLocationSetPtr oldset = NULL;

    CHECK_ARITY(1);
    if ((ctxt->value == NULL) ||
	((ctxt->value->type != XPATH_LOCATIONSET) &&
	 (ctxt->value->type != XPATH_NODESET)))
        XP_ERROR(XPATH_INVALID_TYPE)

    obj = valuePop(ctxt);
    if (obj->type == XPATH_NODESET) {
	/*
	 * First convert to a location set
	 */
	tmp = xmlXPtrNewLocationSetNodeSet(obj->nodesetval);
	xmlXPathFreeObject(obj);
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	if (tmp == NULL)
            XP_ERROR(XPATH_MEMORY_ERROR)
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	obj = tmp;
    }

    newset = xmlXPtrLocationSetCreate(NULL);
    if (newset == NULL) {
	xmlXPathFreeObject(obj);
        XP_ERROR(XPATH_MEMORY_ERROR);
    }
    oldset = (xmlLocationSetPtr) obj->user;
    if (oldset != NULL) {
	int i;

	for (i = 0; i < oldset->locNr; i++) {
	    tmp = oldset->locTab[i];
	    if (tmp == NULL)
		continue;
	    point = NULL;
	    switch (tmp->type) {
		case XPATH_POINT:
		    point = xmlXPtrNewPoint(tmp->user, tmp->index);
		    break;
		case XPATH_RANGE: {
		    xmlNodePtr node = tmp->user;
		    if (node != NULL) {
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			if ((node->type == XML_ATTRIBUTE_NODE) ||
                            (node->type == XML_NAMESPACE_DECL)) {
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			    xmlXPathFreeObject(obj);
			    xmlXPtrFreeLocationSet(newset);
			    XP_ERROR(XPTR_SYNTAX_ERROR);
			}
			point = xmlXPtrNewPoint(node, tmp->index);
		    }
		    break;
	        }
		default:
		    /*** Should we raise an error ?
		    xmlXPathFreeObject(obj);
		    xmlXPathFreeObject(newset);
		    XP_ERROR(XPATH_INVALID_TYPE)
		    ***/
		    break;
	    }
            if (point != NULL)
		xmlXPtrLocationSetAdd(newset, point);
	}
    }
    xmlXPathFreeObject(obj);
    valuePush(ctxt, xmlXPtrWrapLocationSet(newset));
}

/**
 * xmlXPtrEndPointFunction:
 * @ctxt:  the XPointer Parser context
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 * @nargs:  the number of args
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 *
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 * Function implementing end-point() operation
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 * as described in 5.4.3
 * ----------------------------
 * location-set end-point(location-set)
 *
 * For each location x in the argument location-set, end-point adds a
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 * location of type point to the result location-set. That point represents
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 * the end point of location x and is determined by the following rules:
 *
 * - If x is of type point, the resulting point is x.
 * - If x is of type range, the resulting point is the end point of x.
 * - If x is of type root or element, the container node of the resulting
 *   point is x and the index is the number of location children of x.
 * - If x is of type text, comment, or processing instruction, the container
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 *   node of the resulting point is x and the index is the length of the
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 *   string-value of x.
 * - If x is of type attribute or namespace, the function must signal a
 *   syntax error.
 * ----------------------------
 */
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static void
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xmlXPtrEndPointFunction(xmlXPathParserContextPtr ctxt, int nargs) {
    xmlXPathObjectPtr tmp, obj, point;
    xmlLocationSetPtr newset = NULL;
    xmlLocationSetPtr oldset = NULL;

    CHECK_ARITY(1);
    if ((ctxt->value == NULL) ||
	((ctxt->value->type != XPATH_LOCATIONSET) &&
	 (ctxt->value->type != XPATH_NODESET)))
        XP_ERROR(XPATH_INVALID_TYPE)

    obj = valuePop(ctxt);
    if (obj->type == XPATH_NODESET) {
	/*
	 * First convert to a location set
	 */
	tmp = xmlXPtrNewLocationSetNodeSet(obj->nodesetval);
	xmlXPathFreeObject(obj);
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	if (tmp == NULL)
            XP_ERROR(XPATH_MEMORY_ERROR)
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	obj = tmp;
    }

    newset = xmlXPtrLocationSetCreate(NULL);
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    if (newset == NULL) {
	xmlXPathFreeObject(obj);
        XP_ERROR(XPATH_MEMORY_ERROR);
    }
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    oldset = (xmlLocationSetPtr) obj->user;
    if (oldset != NULL) {
	int i;

	for (i = 0; i < oldset->locNr; i++) {
	    tmp = oldset->locTab[i];
	    if (tmp == NULL)
		continue;
	    point = NULL;
	    switch (tmp->type) {
		case XPATH_POINT:
		    point = xmlXPtrNewPoint(tmp->user, tmp->index);
		    break;
		case XPATH_RANGE: {
		    xmlNodePtr node = tmp->user2;
		    if (node != NULL) {
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			if ((node->type == XML_ATTRIBUTE_NODE) ||
                            (node->type == XML_NAMESPACE_DECL)) {
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			    xmlXPathFreeObject(obj);
			    xmlXPtrFreeLocationSet(newset);
			    XP_ERROR(XPTR_SYNTAX_ERROR);
			}
			point = xmlXPtrNewPoint(node, tmp->index2);
		    } else if (tmp->user == NULL) {
			point = xmlXPtrNewPoint(node,
				       xmlXPtrNbLocChildren(node));
		    }
		    break;
	        }
		default:
		    /*** Should we raise an error ?
		    xmlXPathFreeObject(obj);
		    xmlXPathFreeObject(newset);
		    XP_ERROR(XPATH_INVALID_TYPE)
		    ***/
		    break;
	    }
            if (point != NULL)
		xmlXPtrLocationSetAdd(newset, point);
	}
    }
    xmlXPathFreeObject(obj);
    valuePush(ctxt, xmlXPtrWrapLocationSet(newset));
}


/**
 * xmlXPtrCoveringRange:
 * @ctxt:  the XPointer Parser context
 * @loc:  the location for which the covering range must be computed
 *
 * A covering range is a range that wholly encompasses a location
 * Section 5.3.3. Covering Ranges for All Location Types
 *        http://www.w3.org/TR/xptr#N2267
 *
 * Returns a new location or NULL in case of error
 */
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static xmlXPathObjectPtr
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xmlXPtrCoveringRange(xmlXPathParserContextPtr ctxt, xmlXPathObjectPtr loc) {
    if (loc == NULL)
	return(NULL);
    if ((ctxt == NULL) || (ctxt->context == NULL) ||
	(ctxt->context->doc == NULL))
	return(NULL);
    switch (loc->type) {
        case XPATH_POINT:
	    return(xmlXPtrNewRange(loc->user, loc->index,
			           loc->user, loc->index));
        case XPATH_RANGE:
	    if (loc->user2 != NULL) {
		return(xmlXPtrNewRange(loc->user, loc->index,
			              loc->user2, loc->index2));
	    } else {
		xmlNodePtr node = (xmlNodePtr) loc->user;
		if (node == (xmlNodePtr) ctxt->context->doc) {
		    return(xmlXPtrNewRange(node, 0, node,
					   xmlXPtrGetArity(node)));
		} else {
		    switch (node->type) {
			case XML_ATTRIBUTE_NODE:
			/* !!! our model is slightly different than XPath */
			    return(xmlXPtrNewRange(node, 0, node,
					           xmlXPtrGetArity(node)));
			case XML_ELEMENT_NODE:
			case XML_TEXT_NODE:
			case XML_CDATA_SECTION_NODE:
			case XML_ENTITY_REF_NODE:
			case XML_PI_NODE:
			case XML_COMMENT_NODE:
			case XML_DOCUMENT_NODE:
			case XML_NOTATION_NODE:
			case XML_HTML_DOCUMENT_NODE: {
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			    int indx = xmlXPtrGetIndex(node);
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			    node = node->parent;
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			    return(xmlXPtrNewRange(node, indx - 1,
					           node, indx + 1));
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			}
			default:
			    return(NULL);
		    }
		}
	    }
	default:
	    TODO /* missed one case ??? */
    }
    return(NULL);
}

/**
 * xmlXPtrRangeFunction:
 * @ctxt:  the XPointer Parser context
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 * @nargs:  the number of args
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 *
 * Function implementing the range() function 5.4.3
 *  location-set range(location-set )
 *
 *  The range function returns ranges covering the locations in
 *  the argument location-set. For each location x in the argument
 *  location-set, a range location representing the covering range of
 *  x is added to the result location-set.
 */
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static void
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xmlXPtrRangeFunction(xmlXPathParserContextPtr ctxt, int nargs) {
    int i;
    xmlXPathObjectPtr set;
    xmlLocationSetPtr oldset;
    xmlLocationSetPtr newset;

    CHECK_ARITY(1);
    if ((ctxt->value == NULL) ||
	((ctxt->value->type != XPATH_LOCATIONSET) &&
	 (ctxt->value->type != XPATH_NODESET)))
        XP_ERROR(XPATH_INVALID_TYPE)

    set = valuePop(ctxt);
    if (set->type == XPATH_NODESET) {
	xmlXPathObjectPtr tmp;

	/*
	 * First convert to a location set
	 */
	tmp = xmlXPtrNewLocationSetNodeSet(set->nodesetval);
	xmlXPathFreeObject(set);
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	if (tmp == NULL)
            XP_ERROR(XPATH_MEMORY_ERROR)
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	set = tmp;
    }
    oldset = (xmlLocationSetPtr) set->user;

    /*
     * The loop is to compute the covering range for each item and add it
     */
    newset = xmlXPtrLocationSetCreate(NULL);
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    if (newset == NULL) {
	xmlXPathFreeObject(set);
        XP_ERROR(XPATH_MEMORY_ERROR);
    }
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    if (oldset != NULL) {
        for (i = 0;i < oldset->locNr;i++) {
            xmlXPtrLocationSetAdd(newset,
                    xmlXPtrCoveringRange(ctxt, oldset->locTab[i]));
        }
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    }

    /*
     * Save the new value and cleanup
     */
    valuePush(ctxt, xmlXPtrWrapLocationSet(newset));
    xmlXPathFreeObject(set);
}

/**
 * xmlXPtrInsideRange:
 * @ctxt:  the XPointer Parser context
 * @loc:  the location for which the inside range must be computed
 *
 * A inside range is a range described in the range-inside() description
 *
 * Returns a new location or NULL in case of error
 */
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static xmlXPathObjectPtr
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xmlXPtrInsideRange(xmlXPathParserContextPtr ctxt, xmlXPathObjectPtr loc) {
    if (loc == NULL)
	return(NULL);
    if ((ctxt == NULL) || (ctxt->context == NULL) ||
	(ctxt->context->doc == NULL))
	return(NULL);
    switch (loc->type) {
        case XPATH_POINT: {
	    xmlNodePtr node = (xmlNodePtr) loc->user;
	    switch (node->type) {
		case XML_PI_NODE:
		case XML_COMMENT_