xpathinternals.h

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 * @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 (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.
 */
/**
 * xmlXPathVariableLookupFunc:
 * @ctxt:  an XPath context
 * @name:  name of the variable
 * @ns_uri:  the namespace name hosting this variable
 *
 * Prototype for callbacks used to plug variable lookup in the XPath
 * engine.
 *
 * Returns the XPath object value or NULL if not found.
 */
typedef xmlXPathObjectPtr (*xmlXPathVariableLookupFunc) (void *ctxt,
					 const xmlChar *name,
					 const xmlChar *ns_uri);

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

/*
 * Function Lookup forwarding.
 */
/**
 * xmlXPathFuncLookupFunc:
 * @ctxt:  an XPath context
 * @name:  name of the function
 * @ns_uri:  the namespace name hosting this function
 *
 * Prototype for callbacks used to plug function lookup in the XPath
 * engine.
 *
 * Returns the XPath function or NULL if not found.
 */
typedef xmlXPathFunction (*xmlXPathFuncLookupFunc) (void *ctxt,
					 const xmlChar *name,
					 const xmlChar *ns_uri);

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

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

void		xmlXPathDebugDumpObject	(FILE *output,
					 xmlXPathObjectPtr cur,
					 int depth);
void		xmlXPathDebugDumpCompExpr(FILE *output,
					 xmlXPathCompExprPtr comp,
					 int depth);

/**
 * NodeSet handling.
 */
int		xmlXPathNodeSetContains		(xmlNodeSetPtr cur,
						 xmlNodePtr val);
xmlNodeSetPtr	xmlXPathDifference		(xmlNodeSetPtr nodes1,
						 xmlNodeSetPtr nodes2);
xmlNodeSetPtr	xmlXPathIntersection		(xmlNodeSetPtr nodes1,
						 xmlNodeSetPtr nodes2);

xmlNodeSetPtr	xmlXPathDistinctSorted		(xmlNodeSetPtr nodes);
xmlNodeSetPtr	xmlXPathDistinct		(xmlNodeSetPtr nodes);

int		xmlXPathHasSameNodes		(xmlNodeSetPtr nodes1,
						 xmlNodeSetPtr nodes2);

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

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


/**
 * Extending a context.
 */

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

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

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

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

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

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

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

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

int xmlXPathIsNodeType(const xmlChar *name);

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