/*
 * Summary: unfinished XLink detection module
 * Description: unfinished XLink detection module
 *
 * Copy: See Copyright for the status of this software.
 *
 * Author: Daniel Veillard
 * Portion Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies). All rights reserved. 
 */

/** @file
@publishedAll
@released
*/

#ifndef XML_XLINK_H
#define XML_XLINK_H

#include <libxml2_xmlversion.h>
#include <libxml2_tree.h>

#ifdef __cplusplus
extern "C" {
#endif
/**
 * Various defines for the various Link properties.
 *
 * NOTE: the link detection layer will try to resolve QName expansion
 *       of namespaces. If "foo" is the prefix for "http://foo.com/"
 *       then the link detection layer will expand role="foo:myrole"
 *       to "http://foo.com/:myrole".
 * NOTE: the link detection layer will expand URI-Refences found on
 *       href attributes by using the base mechanism if found.
 */
typedef xmlChar *xlinkHRef;
typedef xmlChar *xlinkRole;
typedef xmlChar *xlinkTitle;

typedef enum {
    XLINK_TYPE_NONE = 0,
    XLINK_TYPE_SIMPLE,
    XLINK_TYPE_EXTENDED,
    XLINK_TYPE_EXTENDED_SET
} xlinkType;

typedef enum {
    XLINK_SHOW_NONE = 0,
    XLINK_SHOW_NEW,
    XLINK_SHOW_EMBED,
    XLINK_SHOW_REPLACE
} xlinkShow;

typedef enum {
    XLINK_ACTUATE_NONE = 0,
    XLINK_ACTUATE_AUTO,
    XLINK_ACTUATE_ONREQUEST
} xlinkActuate;

/**
 * xlinkNodeDetectFunc:
 * @param ctx user data pointer
 * @param node the node to check
 *
 * This is the prototype for the link detection routine.
 * It calls the default link detection callbacks upon link detection.
 */
typedef void (*xlinkNodeDetectFunc) (void *ctx, xmlNodePtr node);

/*
 * The link detection module interact with the upper layers using
 * a set of callback registered at parsing time.
 */

/**
 * xlinkSimpleLinkFunk:
 * @param ctx user data pointer
 * @param node the node carrying the link
 * @param href the target of the link
 * @param role the role string
 * @param title the link title
 *
 * This is the prototype for a simple link detection callback.
 */
typedef void
(*xlinkSimpleLinkFunk)  (void *ctx,
                         xmlNodePtr node,
                         const xlinkHRef href,
                         const xlinkRole role,
                         const xlinkTitle title);

/**
 * xlinkExtendedLinkFunk:
 * @param ctx user data pointer
 * @param node the node carrying the link
 * @param nbLocators the number of locators detected on the link
 * @param hrefs pointer to the array of locator hrefs
 * @param roles pointer to the array of locator roles
 * @param nbArcs the number of arcs detected on the link
 * @param from pointer to the array of source roles found on the arcs
 * @param to pointer to the array of target roles found on the arcs
 * @param show array of values for the show attributes found on the arcs
 * @param actuate array of values for the actuate attributes found on the arcs
 * @param nbTitles the number of titles detected on the link
 * @param title array of titles detected on the link
 * @param langs array of xml:lang values for the titles
 *
 * This is the prototype for a extended link detection callback.
 */
typedef void
(*xlinkExtendedLinkFunk)(void *ctx,
                         xmlNodePtr node,
                         int nbLocators,
                         const xlinkHRef *hrefs,
                         const xlinkRole *roles,
                         int nbArcs,
                         const xlinkRole *from,
                         const xlinkRole *to,
                         xlinkShow *show,
                         xlinkActuate *actuate,
                         int nbTitles,
                         const xlinkTitle *titles,
                         const xmlChar **langs);

/**
 * xlinkExtendedLinkSetFunk:
 * @param ctx user data pointer
 * @param node the node carrying the link
 * @param nbLocators the number of locators detected on the link
 * @param hrefs pointer to the array of locator hrefs
 * @param roles pointer to the array of locator roles
 * @param nbTitles the number of titles detected on the link
 * @param title array of titles detected on the link
 * @param langs array of xml:lang values for the titles
 *
 * This is the prototype for a extended link set detection callback.
 */
typedef void
(*xlinkExtendedLinkSetFunk)     (void *ctx,
                                 xmlNodePtr node,
                                 int nbLocators,
                                 const xlinkHRef *hrefs,
                                 const xlinkRole *roles,
                                 int nbTitles,
                                 const xlinkTitle *titles,
                                 const xmlChar **langs);

/**
 * This is the structure containing a set of Links detection callbacks.
 *
 * There is no default xlink callbacks, if one want to get link
 * recognition activated, those call backs must be provided before parsing.
 */
typedef struct _xlinkHandler xlinkHandler;
typedef xlinkHandler *xlinkHandlerPtr;
struct _xlinkHandler {
    xlinkSimpleLinkFunk simple;
    xlinkExtendedLinkFunk extended;
    xlinkExtendedLinkSetFunk set;
};

/*
 * The default detection routine, can be overridden, they call the default
 * detection callbacks.
 */

XMLPUBFUN xlinkNodeDetectFunc XMLCALL
                xlinkGetDefaultDetect   (void);
XMLPUBFUN void XMLCALL
                xlinkSetDefaultDetect   (xlinkNodeDetectFunc func);

/*
 * Routines to set/get the default handlers.
 */
XMLPUBFUN xlinkHandlerPtr XMLCALL
                xlinkGetDefaultHandler  (void);
XMLPUBFUN void XMLCALL
                xlinkSetDefaultHandler  (xlinkHandlerPtr handler);

/*
 * Link detection module itself.
 */
XMLPUBFUN xlinkType XMLCALL
                xlinkIsLink             (xmlDocPtr doc,
                                         xmlNodePtr node);

#ifdef __cplusplus
}
#endif
#endif /* XML_XLINK_H */