| Gnome XML Library Reference Manual |
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struct xmlXPathContext; typedef xmlXPathContextPtr; struct xmlXPathParserContext; typedef xmlXPathParserContextPtr; struct xmlNodeSet; typedef xmlNodeSetPtr; #define XPATH_UNDEFINED #define XPATH_NODESET #define XPATH_BOOLEAN #define XPATH_NUMBER #define XPATH_STRING #define XPATH_USERS struct xmlXPathObject; typedef xmlXPathObjectPtr; int (*xmlXPathConvertFunc) (xmlXPathObjectPtr obj, int type); struct xmlXPathType; typedef xmlXPathTypePtr; struct xmlXPathVariable; typedef xmlXPathVariablePtr; void (*xmlXPathEvalFunc) (xmlXPathParserContextPtr ctxt, int nargs); struct xmlXPathFunct; typedef xmlXPathFuncPtr; xmlXPathObjectPtr (*xmlXPathAxisFunc) (xmlXPathParserContextPtr ctxt, xmlXPathObjectPtr cur); struct xmlXPathAxis; typedef 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);
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 */
};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 */
};struct xmlNodeSet {
int nodeNr; /* # of node in the set */
int nodeMax; /* allocated space */
xmlNodePtr *nodeTab; /* array of nodes in no particular order */
};struct xmlXPathObject {
int type;
xmlNodeSetPtr nodesetval;
int boolval;
double floatval;
xmlChar *stringval;
void *user;
};int (*xmlXPathConvertFunc) (xmlXPathObjectPtr obj, int type);
| obj : | |
| type : | |
| Returns : |
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struct xmlXPathType {
const xmlChar *name; /* the type name */
xmlXPathConvertFunc func; /* the conversion function */
};struct xmlXPathVariable {
const xmlChar *name; /* the variable name */
xmlXPathObjectPtr value; /* the value */
};void (*xmlXPathEvalFunc) (xmlXPathParserContextPtr ctxt, int nargs);
| ctxt : | |
| nargs : |
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struct xmlXPathFunct {
const xmlChar *name; /* the function name */
xmlXPathEvalFunc func; /* the evaluation function */
};xmlXPathObjectPtr (*xmlXPathAxisFunc) (xmlXPathParserContextPtr ctxt, xmlXPathObjectPtr cur);
| ctxt : | |
| cur : | |
| Returns : |
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struct xmlXPathAxis {
const xmlChar *name; /* the axis name */
xmlXPathAxisFunc func; /* the search function */
};void (*xmlXPathFunction) (xmlXPathParserContextPtr ctxt, int nargs);
| ctxt : | |
| nargs : |
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xmlXPathContextPtr xmlXPathNewContext (xmlDocPtr doc);
Create a new xmlXPathContext
| doc : | the XML document |
| Returns : | the xmlXPathContext just allocated. |
void xmlXPathFreeContext (xmlXPathContextPtr ctxt);
Free up an xmlXPathContext
| ctxt : | the context to free |
xmlXPathObjectPtr xmlXPathEval (const xmlChar *str, xmlXPathContextPtr ctxt);
Evaluate the XPath Location Path in the given context.
| str : | the XPath expression |
| ctxt : | the XPath context |
| Returns : | the xmlXPathObjectPtr resulting from the eveluation or NULL. the caller has to free the object. |
void xmlXPathFreeObject (xmlXPathObjectPtr obj);
Free up an xmlXPathObjectPtr object.
| obj : | the object to free |
xmlXPathObjectPtr xmlXPathEvalExpression (const xmlChar *str, xmlXPathContextPtr ctxt);
Evaluate the XPath expression in the given context.
| str : | the XPath expression |
| ctxt : | the XPath context |
| Returns : | the xmlXPathObjectPtr resulting from the evaluation or NULL. the caller has to free the object. |
xmlNodeSetPtr xmlXPathNodeSetCreate (xmlNodePtr val);
Create a new xmlNodeSetPtr of type double and of value val
| val : | an initial xmlNodePtr, or NULL |
| Returns : | the newly created object. |
void xmlXPathFreeNodeSetList (xmlXPathObjectPtr obj);
Free up the xmlXPathObjectPtr obj but don't deallocate the objects in the list contrary to xmlXPathFreeObject().
| obj : | an existing NodeSetList object |
void xmlXPathFreeNodeSet (xmlNodeSetPtr obj);
Free the NodeSet compound (not the actual nodes !).
| obj : | the xmlNodeSetPtr to free |
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