xpath

struct xmlXPathContext {
    xmlDocPtr doc;			/* The current document */
    xmlNodePtr node;			/* The current node */
    xmlNodeSetPtr nodelist;		/* The current node list */

    int nb_variables;			/* number of defined variables */
    int max_variables;			/* max number of variables */
    xmlXPathVariablePtr *variables;	/* Array of defined variables */

    int nb_types;			/* number of defined types */
    int max_types;			/* max number of types */
    xmlXPathTypePtr *types;		/* Array of defined types */

    int nb_funcs;			/* number of defined funcs */
    int max_funcs;			/* max number of funcs */
    xmlXPathFuncPtr *funcs;		/* Array of defined funcs */

    int nb_axis;			/* number of defined axis */
    int max_axis;			/* max number of axis */
    xmlXPathAxisPtr *axis;		/* Array of defined axis */

    /* Namespace traversal should be implemented with user */
    xmlNsPtr *namespaces;		/* The namespaces lookup */
    int nsNr;				/* the current Namespace index */
    void *user;				/* user defined extra info */
};

typedef xmlXPathContext *xmlXPathContextPtr;

struct xmlXPathParserContext {
    const xmlChar *cur;			/* the current char being parsed */
    const xmlChar *base;			/* the full expression */

    int error;				/* error code */

    xmlXPathContextPtr  context;	/* the evaluation context */
    xmlXPathObjectPtr     value;	/* the current value */
    int                 valueNr;	/* number of values stacked */
    int                valueMax;	/* max number of values stacked */
    xmlXPathObjectPtr *valueTab;	/* stack of values */
};

typedef xmlXPathParserContext *xmlXPathParserContextPtr;

struct xmlNodeSet {
    int nodeNr;			/* # of node in the set */
    int nodeMax;		/* allocated space */
    xmlNodePtr *nodeTab;	/* array of nodes in no particular order */
};

typedef xmlNodeSet *xmlNodeSetPtr;

#define XPATH_UNDEFINED	0

#define XPATH_NODESET	1

#define XPATH_BOOLEAN	2

#define XPATH_NUMBER	3

#define XPATH_STRING	4

#define XPATH_USERS	5

struct xmlXPathObject {
    int type;
    xmlNodeSetPtr nodesetval;
    int boolval;
    double floatval;
    xmlChar *stringval;
    void *user;
};

typedef xmlXPathObject *xmlXPathObjectPtr;

int         (*xmlXPathConvertFunc)          (xmlXPathObjectPtr obj,
                                             int type);

struct xmlXPathType {
    const xmlChar         *name;		/* the type name */
    xmlXPathConvertFunc func;		/* the conversion function */
};

typedef xmlXPathType *xmlXPathTypePtr;

struct xmlXPathVariable {
    const xmlChar       *name;		/* the variable name */
    xmlXPathObjectPtr value;		/* the value */
};

typedef xmlXPathVariable *xmlXPathVariablePtr;

void        (*xmlXPathEvalFunc)             (xmlXPathParserContextPtr ctxt,
                                             int nargs);

struct xmlXPathFunct {
    const xmlChar      *name;		/* the function name */
    xmlXPathEvalFunc func;		/* the evaluation function */
};

typedef xmlXPathFunct *xmlXPathFuncPtr;

xmlXPathObjectPtr (*xmlXPathAxisFunc)       (xmlXPathParserContextPtr ctxt,
                                             xmlXPathObjectPtr cur);

struct xmlXPathAxis {
    const xmlChar      *name;		/* the axis name */
    xmlXPathAxisFunc func;		/* the search function */
};

typedef xmlXPathAxis *xmlXPathAxisPtr;

void        (*xmlXPathFunction)             (xmlXPathParserContextPtr ctxt,
                                             int nargs);

xmlXPathContextPtr xmlXPathNewContext       (xmlDocPtr doc);

void        xmlXPathFreeContext             (xmlXPathContextPtr ctxt);

xmlXPathObjectPtr xmlXPathEval              (const xmlChar *str,
                                             xmlXPathContextPtr ctxt);

void        xmlXPathFreeObject              (xmlXPathObjectPtr obj);

xmlXPathObjectPtr xmlXPathEvalExpression    (const xmlChar *str,
                                             xmlXPathContextPtr ctxt);

xmlNodeSetPtr xmlXPathNodeSetCreate         (xmlNodePtr val);

void        xmlXPathFreeNodeSetList         (xmlXPathObjectPtr obj);

void        xmlXPathFreeNodeSet             (xmlNodeSetPtr obj);