xpointer.c 76.5 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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#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
 */
static void
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;
    }
    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);
}

/**
 * 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);

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

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

    ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
    if (ret == NULL) {
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        xmlXPtrErrMemory("allocating range");
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	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
    ret->type = XPATH_RANGE;
    ret->user = start->user;
    ret->index = start->index;
    ret->user2 = end;
    ret->index2 = -1;
    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 (start->type != XPATH_POINT)
	return(NULL);
    if (end->type != XPATH_POINT)
	return(NULL);

    ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
    if (ret == NULL) {
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        xmlXPtrErrMemory("allocating range");
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	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
    ret->type = XPATH_RANGE;
    ret->user = start;
    ret->index = -1;
    ret->user2 = end->user;
    ret->index2 = end->index;
    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);

    ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
    if (ret == NULL) {
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        xmlXPtrErrMemory("allocating range");
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	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
    ret->type = XPATH_RANGE;
    ret->user = start;
    ret->index = -1;
    ret->user2 = end;
    ret->index2 = -1;
    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);

    ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
    if (ret == NULL) {
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        xmlXPtrErrMemory("allocating range");
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	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
    ret->type = XPATH_RANGE;
    ret->user = start;
    ret->index = -1;
    ret->user2 = NULL;
    ret->index2 = -1;
    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) {
    xmlXPathObjectPtr ret;

    if (start == NULL)
	return(NULL);
    if (end == NULL)
	return(NULL);
    switch (end->type) {
	case XPATH_POINT:
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	case XPATH_RANGE:
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	    break;
	case XPATH_NODESET:
	    /*
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	     * Empty set ...
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	     */
	    if (end->nodesetval->nodeNr <= 0)
		return(NULL);
	    break;
	default:
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	    /* TODO */
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	    return(NULL);
    }

    ret = (xmlXPathObjectPtr) xmlMalloc(sizeof(xmlXPathObject));
    if (ret == NULL) {
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        xmlXPtrErrMemory("allocating range");
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	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
    ret->type = XPATH_RANGE;
    ret->user = start;
    ret->index = -1;
    switch (end->type) {
	case XPATH_POINT:
	    ret->user2 = end->user;
	    ret->index2 = end->index;
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	    break;
	case XPATH_RANGE:
	    ret->user2 = end->user2;
	    ret->index2 = end->index2;
	    break;
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	case XPATH_NODESET: {
	    ret->user2 = end->nodesetval->nodeTab[end->nodesetval->nodeNr - 1];
	    ret->index2 = -1;
	    break;
	}
	default:
	    STRANGE
	    return(NULL);
    }
    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) {
798
        xmlXPtrErrMemory("allocating locationset");
799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824
	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) {
825
        xmlXPtrErrMemory("allocating locationset");
826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860
	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) {
861
        xmlXPtrErrMemory("allocating locationset");
862 863 864 865 866 867 868 869 870 871 872 873 874 875
	return(NULL);
    }
    memset(ret, 0 , (size_t) sizeof(xmlXPathObject));
    ret->type = XPATH_LOCATIONSET;
    ret->user = (void *) val;
    return(ret);
}

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

876 877
static void xmlXPtrEvalChildSeq(xmlXPathParserContextPtr ctxt, xmlChar *name);

878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905
/*
 * 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

906
#define SKIP_BLANKS							\
907
    while (IS_BLANK_CH(*(ctxt->cur))) NEXT
908 909 910 911 912 913 914 915 916 917 918 919

#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
 */
920 921
static void
xmlXPtrGetChildNo(xmlXPathParserContextPtr ctxt, int indx) {
922 923 924 925 926 927 928
    xmlNodePtr cur = NULL;
    xmlXPathObjectPtr obj;
    xmlNodeSetPtr oldset;

    CHECK_TYPE(XPATH_NODESET);
    obj = valuePop(ctxt);
    oldset = obj->nodesetval;
929
    if ((indx <= 0) || (oldset == NULL) || (oldset->nodeNr != 1)) {
930 931 932 933
	xmlXPathFreeObject(obj);
	valuePush(ctxt, xmlXPathNewNodeSet(NULL));
	return;
    }
934
    cur = xmlXPtrGetNthChild(oldset->nodeTab[0], indx);
935 936 937 938 939 940 941 942 943 944 945 946 947
    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
948
 *
949 950 951 952 953 954 955
 * XPtrPart ::= 'xpointer' '(' XPtrExpr ')'
 *            | Scheme '(' SchemeSpecificExpr ')'
 *
 * Scheme   ::=  NCName - 'xpointer' [VC: Non-XPointer schemes]
 *
 * SchemeSpecificExpr ::= StringWithBalancedParens
 *
956
 * StringWithBalancedParens ::=
957 958 959 960 961 962 963 964 965 966 967 968 969 970 971 972
 *              [^()]* ('(' 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
973
 * string and if the scheme is 'xpointer' it will call the XPath interpreter.
974
 *
975 976 977
 * TODO: there is no new scheme registration mechanism
 */

978
static void
979 980 981 982 983 984 985 986 987 988 989 990 991 992 993 994 995
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);

    if (CUR != '(')
	XP_ERROR(XPATH_EXPR_ERROR);
    NEXT;
    level = 1;

    len = xmlStrlen(ctxt->cur);
    len++;
996
    buffer = (xmlChar *) xmlMallocAtomic(len * sizeof (xmlChar));
997
    if (buffer == NULL) {
998
        xmlXPtrErrMemory("allocating buffer");
999 1000 1001 1002 1003 1004 1005 1006 1007 1008 1009 1010 1011 1012
	return;
    }

    cur = buffer;
    while (CUR != 0) {
	if (CUR == ')') {
	    level--;
	    if (level == 0) {
		NEXT;
		break;
	    }
	} else if (CUR == '(') {
	    level++;
	} else if (CUR == '^') {
1013 1014 1015
            if ((NXT(1) == ')') || (NXT(1) == '(') || (NXT(1) == '^')) {
                NEXT;
            }
1016
	}
1017
        *cur++ = CUR;
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030
	NEXT;
    }
    *cur = 0;

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

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

	CUR_PTR = buffer;
1031 1032 1033 1034 1035 1036 1037 1038 1039
	/*
	 * 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;
1040 1041
	xmlXPathEvalExpr(ctxt);
	CUR_PTR=left;
1042 1043 1044 1045 1046 1047 1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059
    } 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);
		XP_ERROR(XPATH_EXPR_ERROR);
	    }
	    xmlXPtrEvalChildSeq(ctxt, name2);
	}
	CUR_PTR = left;
1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 1097 1098 1099
#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);
	}
1100

1101 1102
	xmlXPathRegisterNs(ctxt->context, prefix, URI);
	CUR_PTR = left;
1103 1104
	xmlFree(URI);
	xmlFree(prefix);
1105 1106
#endif /* XPTR_XMLNS_SCHEME */
    } else {
1107 1108
        xmlXPtrErr(ctxt, XML_XPTR_UNKNOWN_SCHEME,
		   "unsupported scheme '%s'\n", name);
1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 1133 1134 1135 1136 1137 1138
    }
    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
1139
 * expressions or other schemes.
1140
 */
1141
static void
1142 1143 1144 1145 1146 1147
xmlXPtrEvalFullXPtr(xmlXPathParserContextPtr ctxt, xmlChar *name) {
    if (name == NULL)
    name = xmlXPathParseName(ctxt);
    if (name == NULL)
	XP_ERROR(XPATH_EXPR_ERROR);
    while (name != NULL) {
1148
	ctxt->error = XPATH_EXPRESSION_OK;
1149 1150 1151
	xmlXPtrEvalXPtrPart(ctxt, name);

	/* in case of syntax error, break here */
1152 1153
	if ((ctxt->error != XPATH_EXPRESSION_OK) &&
            (ctxt->error != XML_XPTR_UNKNOWN_SCHEME))
1154 1155 1156 1157 1158 1159 1160 1161 1162 1163 1164 1165 1166 1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 1181 1182 1183 1184 1185 1186 1187 1188 1189 1190 1191 1192
	    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);
	}

	/*
1193
	 * Is there another XPointer part.
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210
	 */
	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.
 */
1211
static void
1212 1213
xmlXPtrEvalChildSeq(xmlXPathParserContextPtr ctxt, xmlChar *name) {
    /*
1214
     * XPointer don't allow by syntax to address in mutirooted trees
1215 1216 1217
     * this might prove useful in some cases, warn about it.
     */
    if ((name == NULL) && (CUR == '/') && (NXT(1) != '1')) {
1218 1219
        xmlXPtrErr(ctxt, XML_XPTR_CHILDSEQ_START,
		   "warning: ChildSeq not starting by /1\n", NULL);
1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231
    }

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

    while (CUR == '/') {
	int child = 0;
	NEXT;
1232

1233 1234 1235 1236 1237 1238 1239 1240 1241 1242 1243 1244 1245 1246 1247 1248 1249 1250 1251
	while ((CUR >= '0') && (CUR <= '9')) {
	    child = child * 10 + (CUR - '0');
	    NEXT;
	}
	xmlXPtrGetChildNo(ctxt, child);
    }
}


/**
 * xmlXPtrEvalXPointer:
 * @ctxt:  the XPointer Parser context
 *
 *  XPointer ::= Name
 *             | ChildSeq
 *             | FullXPtr
 *
 * Parse and evaluate an XPointer
 */
1252
static void
1253
xmlXPtrEvalXPointer(xmlXPathParserContextPtr ctxt) {
1254 1255
    if (ctxt->valueTab == NULL) {
	/* Allocate the value stack */
1256
	ctxt->valueTab = (xmlXPathObjectPtr *)
1257 1258
			 xmlMalloc(10 * sizeof(xmlXPathObjectPtr));
	if (ctxt->valueTab == NULL) {
1259
	    xmlXPtrErrMemory("allocating evaluation context");
1260 1261 1262 1263 1264
	    return;
	}
	ctxt->valueNr = 0;
	ctxt->valueMax = 10;
	ctxt->value = NULL;
1265
	ctxt->valueFrame = 0;
1266
    }
1267 1268 1269 1270 1271 1272 1273 1274 1275 1276 1277 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297
    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				*
 *									*
 ************************************************************************/

1298
static
1299
void xmlXPtrStringRangeFunction(xmlXPathParserContextPtr ctxt, int nargs);
1300
static
1301
void xmlXPtrStartPointFunction(xmlXPathParserContextPtr ctxt, int nargs);
1302
static
1303
void xmlXPtrEndPointFunction(xmlXPathParserContextPtr ctxt, int nargs);
1304
static
1305
void xmlXPtrHereFunction(xmlXPathParserContextPtr ctxt, int nargs);
1306
static
1307
void xmlXPtrOriginFunction(xmlXPathParserContextPtr ctxt, int nargs);
1308
static
1309
void xmlXPtrRangeInsideFunction(xmlXPathParserContextPtr ctxt, int nargs);
1310
static
1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361
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-to",
	                 xmlXPtrRangeToFunction);
    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.
 *
1362
 * Returns the xmlXPathObjectPtr resulting from the evaluation or NULL.
1363 1364 1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377
 *         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);
1378 1379
    if (ctxt == NULL)
	return(NULL);
1380
    ctxt->xptr = 1;
1381 1382 1383 1384 1385
    xmlXPtrEvalXPointer(ctxt);

    if ((ctxt->value != NULL) &&
	(ctxt->value->type != XPATH_NODESET) &&
	(ctxt->value->type != XPATH_LOCATIONSET)) {
1386 1387 1388
        xmlXPtrErr(ctxt, XML_XPTR_EVAL_FAILED,
		"xmlXPtrEval: evaluation failed to return a node set\n",
		   NULL);
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400
    } 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
		     */
1401
		    xmlNodeSetPtr set;
1402 1403 1404 1405 1406
		    set = tmp->nodesetval;
		    if ((set->nodeNr != 1) ||
			(set->nodeTab[0] != (xmlNodePtr) ctx->doc))
			stack++;
		} else
1407
		    stack++;
1408 1409 1410 1411 1412
	    }
	    xmlXPathFreeObject(tmp);
        }
    } while (tmp != NULL);
    if (stack != 0) {
1413 1414 1415
        xmlXPtrErr(ctxt, XML_XPTR_EXTRA_OBJECTS,
		   "xmlXPtrEval: object(s) left on the eval stack\n",
		   NULL);
1416 1417 1418 1419 1420
    }
    if (ctxt->error != XPATH_EXPRESSION_OK) {
	xmlXPathFreeObject(res);
	res = NULL;
    }
1421

1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434
    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.
 */
1435
static xmlNodePtr
1436 1437 1438 1439 1440
xmlXPtrBuildRangeNodeList(xmlXPathObjectPtr range) {
    /* pointers to generated nodes */
    xmlNodePtr list = NULL, last = NULL, parent = NULL, tmp;
    /* pointers to traversal nodes */
    xmlNodePtr start, cur, end;
1441
    int index1, index2;
1442 1443 1444 1445 1446 1447 1448

    if (range == NULL)
	return(NULL);
    if (range->type != XPATH_RANGE)
	return(NULL);
    start = (xmlNodePtr) range->user;

1449
    if ((start == NULL) || (start->type == XML_NAMESPACE_DECL))
1450 1451 1452 1453
	return(NULL);
    end = range->user2;
    if (end == NULL)
	return(xmlCopyNode(start, 1));
1454 1455
    if (end->type == XML_NAMESPACE_DECL)
        return(NULL);
1456 1457

    cur = start;
1458
    index1 = range->index;
1459 1460 1461 1462 1463 1464 1465 1466 1467 1468 1469
    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;
1470 1471 1472 1473
		    if ((cur == start) && (index1 > 1)) {
			content += (index1 - 1);
			len -= (index1 - 1);
			index1 = 0;
1474 1475 1476 1477 1478 1479 1480 1481 1482 1483 1484
		    } 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);
1485
		else
1486 1487 1488 1489 1490 1491 1492 1493 1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 1504
		    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;
		}
1505 1506 1507
		if ((cur == start) && (index1 > 1)) {
		    cur = xmlXPtrGetNthChild(cur, index1 - 1);
		    index1 = 0;
1508 1509 1510 1511 1512 1513 1514 1515 1516 1517
		} else {
		    cur = cur->children;
		}
		/*
		 * Now gather the remaining nodes from cur to end
		 */
		continue; /* while */
	    }
	} else if ((cur == start) &&
		   (list == NULL) /* looks superfluous but ... */ ) {
1518 1519
	    if ((cur->type == XML_TEXT_NODE) ||
		(cur->type == XML_CDATA_SECTION_NODE)) {
1520 1521 1522 1523 1524
		const xmlChar *content = cur->content;

		if (content == NULL) {
		    tmp = xmlNewTextLen(NULL, 0);
		} else {
1525 1526
		    if (index1 > 1) {
			content += (index1 - 1);
1527 1528 1529 1530 1531
		    }
		    tmp = xmlNewText(content);
		}
		last = list = tmp;
	    } else {
1532
		if ((cur == start) && (index1 > 1)) {
1533 1534 1535 1536
		    tmp = xmlCopyNode(cur, 0);
		    list = tmp;
		    parent = tmp;
		    last = NULL;
1537 1538
		    cur = xmlXPtrGetNthChild(cur, index1 - 1);
		    index1 = 0;
1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558
		    /*
		     * 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:
1559
		    TODO /* handle crossing entities -> stack needed */
1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 1584 1585 1586 1587 1588 1589 1590 1591 1592
		    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);
	}
1593
	cur = xmlXPtrAdvanceNode(cur, NULL);
1594 1595 1596 1597 1598 1599 1600 1601 1602
    }
    return(list);
}

/**
 * xmlXPtrBuildNodeList:
 * @obj:  the XPointer result from the evaluation.
 *
 * Build a node list tree copy of the XPointer result.
1603
 * This will drop Attributes and Namespace declarations.
1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620
 *
 * 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++) {
1621 1622 1623 1624 1625 1626 1627 1628 1629 1630 1631 1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649
		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 */
		}
1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 1678 1679 1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696
		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
 *
1697
 * Count the number of location children of @node or the length of the
1698 1699 1700 1701
 * string value in case of text/PI/Comments nodes
 *
 * Returns the number of location children
 */
1702
static int
1703 1704 1705 1706 1707 1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736
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
1737
 * @nargs:  the number of args
1738
 *
1739
 * Function implementing here() operation
1740 1741
 * as described in 5.4.3
 */
1742
static void
1743
xmlXPtrHereFunction(xmlXPathParserContextPtr ctxt, int nargs) {
1744 1745
    CHECK_ARITY(0);

1746 1747
    if (ctxt->context->here == NULL)
	XP_ERROR(XPTR_SYNTAX_ERROR);
1748

1749 1750 1751 1752 1753 1754
    valuePush(ctxt, xmlXPtrNewLocationSetNodes(ctxt->context->here, NULL));
}

/**
 * xmlXPtrOriginFunction:
 * @ctxt:  the XPointer Parser context
1755
 * @nargs:  the number of args
1756
 *
1757
 * Function implementing origin() operation
1758 1759
 * as described in 5.4.3
 */
1760
static void
1761
xmlXPtrOriginFunction(xmlXPathParserContextPtr ctxt, int nargs) {
1762 1763
    CHECK_ARITY(0);

1764 1765
    if (ctxt->context->origin == NULL)
	XP_ERROR(XPTR_SYNTAX_ERROR);
1766

1767 1768 1769 1770 1771 1772
    valuePush(ctxt, xmlXPtrNewLocationSetNodes(ctxt->context->origin, NULL));
}

/**
 * xmlXPtrStartPointFunction:
 * @ctxt:  the XPointer Parser context
1773
 * @nargs:  the number of args
1774
 *
1775
 * Function implementing start-point() operation
1776 1777 1778 1779 1780 1781 1782 1783 1784 1785 1786 1787 1788 1789 1790 1791 1792
 * 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.
 * ----------------
 *
 */
1793
static void
1794 1795 1796 1797 1798 1799 1800 1801 1802 1803 1804 1805 1806 1807 1808 1809 1810 1811
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);
1812 1813
	if (tmp == NULL)
            XP_ERROR(XPATH_MEMORY_ERROR)
1814 1815 1816 1817 1818 1819 1820 1821 1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 1832 1833 1834 1835 1836 1837 1838 1839 1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866
	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) {
			if (node->type == XML_ATTRIBUTE_NODE) {
			    /* TODO: Namespace Nodes ??? */
			    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
1867
 * @nargs:  the number of args
1868
 *
1869
 * Function implementing end-point() operation
1870 1871 1872 1873 1874
 * 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
1875
 * location of type point to the result location-set. That point represents
1876 1877 1878 1879 1880 1881 1882
 * 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
1883
 *   node of the resulting point is x and the index is the length of the
1884 1885 1886 1887 1888
 *   string-value of x.
 * - If x is of type attribute or namespace, the function must signal a
 *   syntax error.
 * ----------------------------
 */
1889
static void
1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 1900 1901 1902 1903 1904 1905 1906 1907
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);
1908 1909
	if (tmp == NULL)
            XP_ERROR(XPATH_MEMORY_ERROR)
1910 1911 1912 1913
	obj = tmp;
    }

    newset = xmlXPtrLocationSetCreate(NULL);
1914 1915 1916 1917
    if (newset == NULL) {
	xmlXPathFreeObject(obj);
        XP_ERROR(XPATH_MEMORY_ERROR);
    }
1918 1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 1955 1956 1957 1958 1959 1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 1972 1973 1974
    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) {
			if (node->type == XML_ATTRIBUTE_NODE) {
			    /* TODO: Namespace Nodes ??? */
			    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
 */
1975
static xmlXPathObjectPtr
1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 2001 2002 2003 2004 2005 2006 2007 2008 2009
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: {
2010
			    int indx = xmlXPtrGetIndex(node);
2011

2012
			    node = node->parent;
2013 2014
			    return(xmlXPtrNewRange(node, indx - 1,
					           node, indx + 1));
2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 2029
			}
			default:
			    return(NULL);
		    }
		}
	    }
	default:
	    TODO /* missed one case ??? */
    }
    return(NULL);
}

/**
 * xmlXPtrRangeFunction:
 * @ctxt:  the XPointer Parser context
2030
 * @nargs:  the number of args
2031 2032 2033 2034 2035 2036 2037 2038 2039
 *
 * 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.
 */
2040
static void
2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061
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);
2062 2063
	if (tmp == NULL)
            XP_ERROR(XPATH_MEMORY_ERROR)
2064 2065 2066 2067 2068 2069 2070 2071
	set = tmp;
    }
    oldset = (xmlLocationSetPtr) set->user;

    /*
     * The loop is to compute the covering range for each item and add it
     */
    newset = xmlXPtrLocationSetCreate(NULL);
2072 2073 2074 2075
    if (newset == NULL) {
	xmlXPathFreeObject(set);
        XP_ERROR(XPATH_MEMORY_ERROR);
    }
2076 2077 2078 2079 2080 2081 2082 2083 2084 2085 2086 2087 2088 2089 2090 2091 2092 2093 2094 2095 2096
    for (i = 0;i < oldset->locNr;i++) {
	xmlXPtrLocationSetAdd(newset,
		xmlXPtrCoveringRange(ctxt, oldset->locTab[i]));
    }

    /*
     * 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
 */
2097
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_NODE:
		case XML_TEXT_NODE:
		case XML_CDATA_SECTION_NODE: {
		    if (node->content == NULL) {
			return(xmlXPtrNewRange(node, 0, node, 0));
		    } else {
			return(xmlXPtrNewRange(node, 0, node,
					       xmlStrlen(node->content)));
		    }
		}
		case XML_ATTRIBUTE_NODE:
		case XML_ELEMENT_NODE:
		case XML_ENTITY_REF_NODE:
		case XML_DOCUMENT_NODE:
		case XML_NOTATION_NODE:
		case XML_HTML_DOCUMENT_NODE: {
		    return(xmlXPtrNewRange(node, 0, node,
					   xmlXPtrGetArity(node)));
		}
		default:
2129
		    break;
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	    }
	    return(NULL);
	}
        case XPATH_RANGE: {
	    xmlNodePtr node = (xmlNodePtr) loc->user;
	    if (loc->user2 != NULL) {
		return(xmlXPtrNewRange(node, loc->index,
			               loc->user2, loc->index2));
	    } else {
		switch (node->type) {
		    case XML_PI_NODE:
		    case XML_COMMENT_NODE:
		    case XML_TEXT_NODE:
		    case XML_CDATA_SECTION_NODE: {
			if (node->content == NULL) {
			    return(xmlXPtrNewRange(node, 0, node, 0));
			} else {
			    return(xmlXPtrNewRange(node, 0, node,
						   xmlStrlen(node->content)));
			}
		    }
		    case XML_ATTRIBUTE_NODE:
		    case XML_ELEMENT_NODE:
		    case XML_ENTITY_REF_NODE:
		    case XML_DOCUMENT_NODE:
		    case XML_NOTATION_NODE:
		    case XML_HTML_DOCUMENT_NODE: {
			return(xmlXPtrNewRange(node, 0, node,
					       xmlXPtrGetArity(node)));
		    }
		    default:
2161
			break;
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		}
		return(NULL);
	    }
        }
	default:
	    TODO /* missed one case ??? */
    }