/*

 * 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 "Libxml2_xpath.h"

#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));         \

      (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 (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);

XMLPUBFUN void XMLCALL  

    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);

XMLPUBFUN void XMLCALL  

        xmlXPathRegisterFuncLookup  (xmlXPathContextPtr ctxt,

                     xmlXPathFuncLookupFunc f,

                     void *funcCtxt);

/*

 * Error reporting.

 */

// TODO: Define alternative (void) bahavior for Symbian releases

// DONE: Replaced with macro

#define xmlXPatherror(ctxt,file,line,no)  xmlXPathErr(ctxt, no)

//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);