| /* |
| * xpath.c: interface for XML Path Language implementation |
| * |
| * Reference: W3C Working Draft 5 July 1999 |
| * http://www.w3.org/Style/XSL/Group/1999/07/xpath-19990705.html |
| * |
| * See COPYRIGHT for the status of this software |
| * |
| * Author: Daniel.Veillard@w3.org |
| */ |
| |
| #ifndef __XML_XPATH_H__ |
| #define __XML_XPATH_H__ |
| |
| #include "tree.h" |
| |
| /* |
| * A node-set (an unordered collection of nodes without duplicates) |
| */ |
| typedef struct xmlNodeSet { |
| int nodeNr; /* # of node in the set */ |
| int nodeMax; /* allocated space */ |
| xmlNodePtr *nodeTab; /* array of nodes in no particular order */ |
| } xmlNodeSet, *xmlNodeSetPtr; |
| |
| /* |
| * An expression is evaluated to yield an object, which |
| * has one of the following four basic types: |
| * - node-set |
| * - boolean |
| * - number |
| * - string |
| */ |
| |
| #define XPATH_UNDEFINED 0 |
| #define XPATH_NODESET 1 |
| #define XPATH_BOOLEAN 2 |
| #define XPATH_NUMBER 3 |
| #define XPATH_STRING 4 |
| #define XPATH_MARKER 5 /* used for func call checks */ |
| |
| typedef struct xmlXPathObject { |
| int type; |
| xmlNodeSetPtr nodesetval; |
| int boolval; |
| float floatval; |
| CHAR *stringval; |
| } xmlXPathObject, *xmlXPathObjectPtr; |
| |
| /* |
| * Expression evaluation occurs with respect to a context. |
| * he context consists of: |
| * - a node (the context node) |
| * - a node list (the context node list) |
| * - a set of variable bindings |
| * - a function library |
| * - the set of namespace declarations in scope for the expression |
| */ |
| |
| typedef struct xmlXPathContext { |
| xmlDocPtr doc; /* The current document */ |
| xmlNodePtr node; /* The current node */ |
| xmlNodeSetPtr nodelist; /* The current node list */ |
| void *variables; /* TODO !!!! */ |
| void *functions; /* TODO !!!! */ |
| void *namespaces; /* TODO !!!! */ |
| } xmlXPathContext, *xmlXPathContextPtr; |
| |
| /* |
| * An XPath parser context, it contains pure parsing informations, |
| * an xmlXPathContext, and the stack of objects. |
| */ |
| typedef struct xmlXPathParserContext { |
| const CHAR *cur; /* the current char being parsed */ |
| const CHAR *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 */ |
| } xmlXPathParserContext, *xmlXPathParserContextPtr; |
| |
| /* |
| * An XPath function |
| * The arguments (if any) are popped out of the context stack |
| * and the result is pushed on the stack. |
| */ |
| |
| typedef void (*xmlXPathFunction) (xmlXPathParserContextPtr ctxt, int nargs); |
| |
| /************************************************************************ |
| * * |
| * Public API * |
| * * |
| ************************************************************************/ |
| |
| xmlXPathContextPtr xmlXPathNewContext(xmlDocPtr doc, void *variables, |
| void *functions, void *namespaces); |
| void xmlXPathFreeContext(xmlXPathContextPtr ctxt); |
| xmlXPathObjectPtr xmlXPathEval(const CHAR *str, xmlXPathContextPtr ctxt); |
| void xmlXPathFreeObject(xmlXPathObjectPtr obj); |
| xmlXPathObjectPtr xmlXPathEvalExpression(const CHAR *str, |
| xmlXPathContextPtr ctxt); |
| |
| #endif /* ! __XML_XPATH_H__ */ |