/*
 * Summary: internal interfaces for XML Path Language implementation
 * Description: internal interfaces for XML Path Language implementation
 *              used to build new modules on top of XPath like XPointer and
 *              XSLT
 *
 * Copy: See Copyright for the status of this software.
 *
 * Author: Daniel Veillard
 */

#ifndef __XML_XPATH_INTERNALS_H__
#define __XML_XPATH_INTERNALS_H__

#include "xmlversion.h"
#include "xpath.h"

#ifdef LIBXML_XPATH_ENABLED

#ifdef __cplusplus
extern "C" {
#endif

/************************************************************************
 *                                                                      *
 *                      Helpers                                         *
 *                                                                      *
 ************************************************************************/

/*
 * Many of these macros may later turn into functions. They
 * shouldn't be used in #ifdef's preprocessor instructions.
 */
/**
 * xmlXPathSetError:
 * @ctxt:  an XPath parser context
 * @err:  an xmlXPathError code
 *
 * Raises an error.
 */
#define xmlXPathSetError(ctxt, err)                                     \
    { xmlXPatherror((ctxt), __FILE__, __LINE__, (err));                 \
      if ((ctxt) != NULL) (ctxt)->error = (err); }

/**
 * xmlXPathSetArityError:
 * @ctxt:  an XPath parser context
 *
 * Raises an XPATH_INVALID_ARITY error.
 */
#define xmlXPathSetArityError(ctxt)                                     \
    xmlXPathSetError((ctxt), XPATH_INVALID_ARITY)

/**
 * xmlXPathSetTypeError:
 * @ctxt:  an XPath parser context
 *
 * Raises an XPATH_INVALID_TYPE error.
 */
#define xmlXPathSetTypeError(ctxt)                                      \
    xmlXPathSetError((ctxt), XPATH_INVALID_TYPE)

/**
 * xmlXPathGetError:
 * @ctxt:  an XPath parser context
 *
 * Get the error code of an XPath context.
 *
 * Returns the context error.
 */
#define xmlXPathGetError(ctxt)    ((ctxt)->error)

/**
 * xmlXPathCheckError:
 * @ctxt:  an XPath parser context
 *
 * Check if an XPath error was raised.
 *
 * Returns true if an error has been raised, false otherwise.
 */
#define xmlXPathCheckError(ctxt)  ((ctxt)->error != XPATH_EXPRESSION_OK)

/**
 * xmlXPathGetDocument:
 * @ctxt:  an XPath parser context
 *
 * Get the document of an XPath context.
 *
 * Returns the context document.
 */
#define xmlXPathGetDocument(ctxt)       ((ctxt)->context->doc)

/**
 * xmlXPathGetContextNode:
 * @ctxt: an XPath parser context
 *
 * Get the context node of an XPath context.
 *
 * Returns the context node.
 */
#define xmlXPathGetContextNode(ctxt)    ((ctxt)->context->node)

XMLPUBFUN int XMLCALL           
                xmlXPathPopBoolean      (xmlXPathParserContextPtr ctxt);
XMLPUBFUN double XMLCALL                
                xmlXPathPopNumber       (xmlXPathParserContextPtr ctxt);
XMLPUBFUN xmlChar * XMLCALL     
                xmlXPathPopString       (xmlXPathParserContextPtr ctxt);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathPopNodeSet      (xmlXPathParserContextPtr ctxt);
XMLPUBFUN void * XMLCALL                
                xmlXPathPopExternal     (xmlXPathParserContextPtr ctxt);

/**
 * xmlXPathReturnBoolean:
 * @ctxt:  an XPath parser context
 * @val:  a boolean
 *
 * Pushes the boolean @val on the context stack.
 */
#define xmlXPathReturnBoolean(ctxt, val)                                \
    valuePush((ctxt), xmlXPathNewBoolean(val))

/**
 * xmlXPathReturnTrue:
 * @ctxt:  an XPath parser context
 *
 * Pushes true on the context stack.
 */
#define xmlXPathReturnTrue(ctxt)   xmlXPathReturnBoolean((ctxt), 1)

/**
 * xmlXPathReturnFalse:
 * @ctxt:  an XPath parser context
 *
 * Pushes false on the context stack.
 */
#define xmlXPathReturnFalse(ctxt)  xmlXPathReturnBoolean((ctxt), 0)

/**
 * xmlXPathReturnNumber:
 * @ctxt:  an XPath parser context
 * @val:  a double
 *
 * Pushes the double @val on the context stack.
 */
#define xmlXPathReturnNumber(ctxt, val)                                 \
    valuePush((ctxt), xmlXPathNewFloat(val))

/**
 * xmlXPathReturnString:
 * @ctxt:  an XPath parser context
 * @str:  a string
 *
 * Pushes the string @str on the context stack.
 */
#define xmlXPathReturnString(ctxt, str)                                 \
    valuePush((ctxt), xmlXPathWrapString(str))

/**
 * xmlXPathReturnEmptyString:
 * @ctxt:  an XPath parser context
 *
 * Pushes an empty string on the stack.
 */
#define xmlXPathReturnEmptyString(ctxt)                                 \
    valuePush((ctxt), xmlXPathNewCString(""))

/**
 * xmlXPathReturnNodeSet:
 * @ctxt:  an XPath parser context
 * @ns:  a node-set
 *
 * Pushes the node-set @ns on the context stack.
 */
#define xmlXPathReturnNodeSet(ctxt, ns)                                 \
    valuePush((ctxt), xmlXPathWrapNodeSet(ns))

/**
 * xmlXPathReturnEmptyNodeSet:
 * @ctxt:  an XPath parser context
 *
 * Pushes an empty node-set on the context stack.
 */
#define xmlXPathReturnEmptyNodeSet(ctxt)                                \
    valuePush((ctxt), xmlXPathNewNodeSet(NULL))

/**
 * xmlXPathReturnExternal:
 * @ctxt:  an XPath parser context
 * @val:  user data
 *
 * Pushes user data on the context stack.
 */
#define xmlXPathReturnExternal(ctxt, val)                               \
    valuePush((ctxt), xmlXPathWrapExternal(val))

/**
 * xmlXPathStackIsNodeSet:
 * @ctxt: an XPath parser context
 *
 * Check if the current value on the XPath stack is a node set or
 * an XSLT value tree.
 *
 * Returns true if the current object on the stack is a node-set.
 */
#define xmlXPathStackIsNodeSet(ctxt)                                    \
    (((ctxt)->value != NULL)                                            \
     && (((ctxt)->value->type == XPATH_NODESET)                         \
         || ((ctxt)->value->type == XPATH_XSLT_TREE)))

/**
 * xmlXPathStackIsExternal:
 * @ctxt: an XPath parser context
 *
 * Checks if the current value on the XPath stack is an external
 * object.
 *
 * Returns true if the current object on the stack is an external
 * object.
 */
#define xmlXPathStackIsExternal(ctxt)                                   \
        ((ctxt->value != NULL) && (ctxt->value->type == XPATH_USERS))

/**
 * xmlXPathEmptyNodeSet:
 * @ns:  a node-set
 *
 * Empties a node-set.
 */
#define xmlXPathEmptyNodeSet(ns)                                        \
    { while ((ns)->nodeNr > 0) (ns)->nodeTab[(ns)->nodeNr--] = NULL; }

/**
 * CHECK_ERROR:
 *
 * Macro to return from the function if an XPath error was detected.
 */
#define CHECK_ERROR                                                     \
    if (ctxt->error != XPATH_EXPRESSION_OK) return

/**
 * CHECK_ERROR0:
 *
 * Macro to return 0 from the function if an XPath error was detected.
 */
#define CHECK_ERROR0                                                    \
    if (ctxt->error != XPATH_EXPRESSION_OK) return(0)

/**
 * XP_ERROR:
 * @X:  the error code
 *
 * Macro to raise an XPath error and return.
 */
#define XP_ERROR(X)                                                     \
    { xmlXPathErr(ctxt, X); return; }

/**
 * XP_ERROR0:
 * @X:  the error code
 *
 * Macro to raise an XPath error and return 0.
 */
#define XP_ERROR0(X)                                                    \
    { xmlXPathErr(ctxt, X); return(0); }

/**
 * CHECK_TYPE:
 * @typeval:  the XPath type
 *
 * Macro to check that the value on top of the XPath stack is of a given
 * type.
 */
#define CHECK_TYPE(typeval)                                             \
    if ((ctxt->value == NULL) || (ctxt->value->type != typeval))        \
        XP_ERROR(XPATH_INVALID_TYPE)

/**
 * CHECK_TYPE0:
 * @typeval:  the XPath type
 *
 * Macro to check that the value on top of the XPath stack is of a given
 * type. Return(0) in case of failure
 */
#define CHECK_TYPE0(typeval)                                            \
    if ((ctxt->value == NULL) || (ctxt->value->type != typeval))        \
        XP_ERROR0(XPATH_INVALID_TYPE)

/**
 * CHECK_ARITY:
 * @x:  the number of expected args
 *
 * Macro to check that the number of args passed to an XPath function matches.
 */
#define CHECK_ARITY(x)                                                  \
    if (ctxt == NULL) return;                                           \
    if (nargs != (x))                                                   \
        XP_ERROR(XPATH_INVALID_ARITY);

/**
 * CAST_TO_STRING:
 *
 * Macro to try to cast the value on the top of the XPath stack to a string.
 */
#define CAST_TO_STRING                                                  \
    if ((ctxt->value != NULL) && (ctxt->value->type != XPATH_STRING))   \
        xmlXPathStringFunction(ctxt, 1);

/**
 * CAST_TO_NUMBER:
 *
 * Macro to try to cast the value on the top of the XPath stack to a number.
 */
#define CAST_TO_NUMBER                                                  \
    if ((ctxt->value != NULL) && (ctxt->value->type != XPATH_NUMBER))   \
        xmlXPathNumberFunction(ctxt, 1);

/**
 * CAST_TO_BOOLEAN:
 *
 * Macro to try to cast the value on the top of the XPath stack to a boolean.
 */
#define CAST_TO_BOOLEAN                                                 \
    if ((ctxt->value != NULL) && (ctxt->value->type != XPATH_BOOLEAN))  \
        xmlXPathBooleanFunction(ctxt, 1);

/*
 * Variable Lookup forwarding.
 */

XMLPUBFUN void XMLCALL  
        xmlXPathRegisterVariableLookup  (xmlXPathContextPtr ctxt,
                                         xmlXPathVariableLookupFunc f,
                                         void *data);

/*
 * Function Lookup forwarding.
 */

XMLPUBFUN void XMLCALL  
            xmlXPathRegisterFuncLookup  (xmlXPathContextPtr ctxt,
                                         xmlXPathFuncLookupFunc f,
                                         void *funcCtxt);

/*
 * Error reporting.
 */
XMLPUBFUN void XMLCALL          
                xmlXPatherror   (xmlXPathParserContextPtr ctxt,
                                 const char *file,
                                 int line,
                                 int no);

XMLPUBFUN void XMLCALL
                xmlXPathErr     (xmlXPathParserContextPtr ctxt,
                                 int error);

#ifdef LIBXML_DEBUG_ENABLED
XMLPUBFUN void XMLCALL          
                xmlXPathDebugDumpObject (FILE *output,
                                         xmlXPathObjectPtr cur,
                                         int depth);
XMLPUBFUN void XMLCALL          
            xmlXPathDebugDumpCompExpr(FILE *output,
                                         xmlXPathCompExprPtr comp,
                                         int depth);
#endif
/**
 * NodeSet handling.
 */
XMLPUBFUN int XMLCALL           
                xmlXPathNodeSetContains         (xmlNodeSetPtr cur,
                                                 xmlNodePtr val);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathDifference              (xmlNodeSetPtr nodes1,
                                                 xmlNodeSetPtr nodes2);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathIntersection            (xmlNodeSetPtr nodes1,
                                                 xmlNodeSetPtr nodes2);

XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathDistinctSorted          (xmlNodeSetPtr nodes);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathDistinct                (xmlNodeSetPtr nodes);

XMLPUBFUN int XMLCALL           
                xmlXPathHasSameNodes            (xmlNodeSetPtr nodes1,
                                                 xmlNodeSetPtr nodes2);

XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathNodeLeadingSorted       (xmlNodeSetPtr nodes,
                                                 xmlNodePtr node);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathLeadingSorted           (xmlNodeSetPtr nodes1,
                                                 xmlNodeSetPtr nodes2);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathNodeLeading             (xmlNodeSetPtr nodes,
                                                 xmlNodePtr node);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathLeading                 (xmlNodeSetPtr nodes1,
                                                 xmlNodeSetPtr nodes2);

XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathNodeTrailingSorted      (xmlNodeSetPtr nodes,
                                                 xmlNodePtr node);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathTrailingSorted          (xmlNodeSetPtr nodes1,
                                                 xmlNodeSetPtr nodes2);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathNodeTrailing            (xmlNodeSetPtr nodes,
                                                 xmlNodePtr node);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathTrailing                (xmlNodeSetPtr nodes1,
                                                 xmlNodeSetPtr nodes2);


/**
 * Extending a context.
 */

XMLPUBFUN int XMLCALL              
                xmlXPathRegisterNs              (xmlXPathContextPtr ctxt,
                                                 const xmlChar *prefix,
                                                 const xmlChar *ns_uri);
XMLPUBFUN const xmlChar * XMLCALL          
                xmlXPathNsLookup                (xmlXPathContextPtr ctxt,
                                                 const xmlChar *prefix);
XMLPUBFUN void XMLCALL             
                xmlXPathRegisteredNsCleanup     (xmlXPathContextPtr ctxt);

XMLPUBFUN int XMLCALL              
                xmlXPathRegisterFunc            (xmlXPathContextPtr ctxt,
                                                 const xmlChar *name,
                                                 xmlXPathFunction f);
XMLPUBFUN int XMLCALL              
                xmlXPathRegisterFuncNS          (xmlXPathContextPtr ctxt,
                                                 const xmlChar *name,
                                                 const xmlChar *ns_uri,
                                                 xmlXPathFunction f);
XMLPUBFUN int XMLCALL              
                xmlXPathRegisterVariable        (xmlXPathContextPtr ctxt,
                                                 const xmlChar *name,
                                                 xmlXPathObjectPtr value);
XMLPUBFUN int XMLCALL              
                xmlXPathRegisterVariableNS      (xmlXPathContextPtr ctxt,
                                                 const xmlChar *name,
                                                 const xmlChar *ns_uri,
                                                 xmlXPathObjectPtr value);
XMLPUBFUN xmlXPathFunction XMLCALL   
                xmlXPathFunctionLookup          (xmlXPathContextPtr ctxt,
                                                 const xmlChar *name);
XMLPUBFUN xmlXPathFunction XMLCALL   
                xmlXPathFunctionLookupNS        (xmlXPathContextPtr ctxt,
                                                 const xmlChar *name,
                                                 const xmlChar *ns_uri);
XMLPUBFUN void XMLCALL             
                xmlXPathRegisteredFuncsCleanup  (xmlXPathContextPtr ctxt);
XMLPUBFUN xmlXPathObjectPtr XMLCALL  
                xmlXPathVariableLookup          (xmlXPathContextPtr ctxt,
                                                 const xmlChar *name);
XMLPUBFUN xmlXPathObjectPtr XMLCALL  
                xmlXPathVariableLookupNS        (xmlXPathContextPtr ctxt,
                                                 const xmlChar *name,
                                                 const xmlChar *ns_uri);
XMLPUBFUN void XMLCALL             
                xmlXPathRegisteredVariablesCleanup(xmlXPathContextPtr ctxt);

/**
 * Utilities to extend XPath.
 */
XMLPUBFUN xmlXPathParserContextPtr XMLCALL
                  xmlXPathNewParserContext      (const xmlChar *str,
                                                 xmlXPathContextPtr ctxt);
XMLPUBFUN void XMLCALL            
                xmlXPathFreeParserContext       (xmlXPathParserContextPtr ctxt);

/* TODO: remap to xmlXPathValuePop and Push. */
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                valuePop                        (xmlXPathParserContextPtr ctxt);
XMLPUBFUN int XMLCALL             
                valuePush                       (xmlXPathParserContextPtr ctxt,
                                                 xmlXPathObjectPtr value);

XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathNewString               (const xmlChar *val);
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathNewCString              (const char *val);
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathWrapString              (xmlChar *val);
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathWrapCString             (char * val);
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathNewFloat                (double val);
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathNewBoolean              (int val);
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathNewNodeSet              (xmlNodePtr val);
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathNewValueTree            (xmlNodePtr val);
XMLPUBFUN void XMLCALL            
                xmlXPathNodeSetAdd              (xmlNodeSetPtr cur,
                                                 xmlNodePtr val);
XMLPUBFUN void XMLCALL              
                xmlXPathNodeSetAddUnique        (xmlNodeSetPtr cur,
                                                 xmlNodePtr val);
XMLPUBFUN void XMLCALL            
                xmlXPathNodeSetAddNs            (xmlNodeSetPtr cur, 
                                                 xmlNodePtr node, 
                                                 xmlNsPtr ns);
XMLPUBFUN void XMLCALL              
                xmlXPathNodeSetSort             (xmlNodeSetPtr set);

XMLPUBFUN void XMLCALL            
                xmlXPathRoot                    (xmlXPathParserContextPtr ctxt);
XMLPUBFUN void XMLCALL            
                xmlXPathEvalExpr                (xmlXPathParserContextPtr ctxt);
XMLPUBFUN xmlChar * XMLCALL       
                xmlXPathParseName               (xmlXPathParserContextPtr ctxt);
XMLPUBFUN xmlChar * XMLCALL       
                xmlXPathParseNCName             (xmlXPathParserContextPtr ctxt);

/*
 * Existing functions.
 */
XMLPUBFUN double XMLCALL 
                xmlXPathStringEvalNumber        (const xmlChar *str);
XMLPUBFUN int XMLCALL 
                xmlXPathEvaluatePredicateResult (xmlXPathParserContextPtr ctxt, 
                                                 xmlXPathObjectPtr res);
XMLPUBFUN void XMLCALL 
                xmlXPathRegisterAllFunctions    (xmlXPathContextPtr ctxt);
XMLPUBFUN xmlNodeSetPtr XMLCALL 
                xmlXPathNodeSetMerge            (xmlNodeSetPtr val1, 
                                                 xmlNodeSetPtr val2);
XMLPUBFUN void XMLCALL 
                xmlXPathNodeSetDel              (xmlNodeSetPtr cur, 
                                                 xmlNodePtr val);
XMLPUBFUN void XMLCALL 
                xmlXPathNodeSetRemove           (xmlNodeSetPtr cur, 
                                                 int val);
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathNewNodeSetList          (xmlNodeSetPtr val);
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathWrapNodeSet             (xmlNodeSetPtr val);
XMLPUBFUN xmlXPathObjectPtr XMLCALL 
                xmlXPathWrapExternal            (void *val);

XMLPUBFUN int XMLCALL xmlXPathEqualValues(xmlXPathParserContextPtr ctxt);
XMLPUBFUN int XMLCALL xmlXPathNotEqualValues(xmlXPathParserContextPtr ctxt);
XMLPUBFUN int XMLCALL xmlXPathCompareValues(xmlXPathParserContextPtr ctxt, int inf, int strict);
XMLPUBFUN void XMLCALL xmlXPathValueFlipSign(xmlXPathParserContextPtr ctxt);
XMLPUBFUN void XMLCALL xmlXPathAddValues(xmlXPathParserContextPtr ctxt);
XMLPUBFUN void XMLCALL xmlXPathSubValues(xmlXPathParserContextPtr ctxt);
XMLPUBFUN void XMLCALL xmlXPathMultValues(xmlXPathParserContextPtr ctxt);
XMLPUBFUN void XMLCALL xmlXPathDivValues(xmlXPathParserContextPtr ctxt);
XMLPUBFUN void XMLCALL xmlXPathModValues(xmlXPathParserContextPtr ctxt);

XMLPUBFUN int XMLCALL xmlXPathIsNodeType(const xmlChar *name);

/*
 * Some of the axis navigation routines.
 */
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextSelf(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextChild(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextDescendant(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextDescendantOrSelf(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextParent(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextAncestorOrSelf(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextFollowingSibling(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextFollowing(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextNamespace(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextAttribute(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextPreceding(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextAncestor(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
XMLPUBFUN xmlNodePtr XMLCALL xmlXPathNextPrecedingSibling(xmlXPathParserContextPtr ctxt,
                        xmlNodePtr cur);
/*
 * The official core of XPath functions.
 */
XMLPUBFUN void XMLCALL xmlXPathLastFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathPositionFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathCountFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathIdFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathLocalNameFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathNamespaceURIFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathStringFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathStringLengthFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathConcatFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathContainsFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathStartsWithFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathSubstringFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathSubstringBeforeFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathSubstringAfterFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathNormalizeFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathTranslateFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathNotFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathTrueFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathFalseFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathLangFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathNumberFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathSumFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathFloorFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathCeilingFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathRoundFunction(xmlXPathParserContextPtr ctxt, int nargs);
XMLPUBFUN void XMLCALL xmlXPathBooleanFunction(xmlXPathParserContextPtr ctxt, int nargs);

/**
 * Really internal functions
 */
XMLPUBFUN void XMLCALL xmlXPathNodeSetFreeNs(xmlNsPtr ns);
 
#ifdef __cplusplus
}
#endif

#endif /* LIBXML_XPATH_ENABLED */
#endif /* ! __XML_XPATH_INTERNALS_H__ */
