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/*                 /Net/dxcern/userd/timbl/hypertext/WWW/Library/Implementation/HTAnchor.html
 */


/*      Hypertext "Anchor" Object                                    HTAnchor.h
**      ==========================
**
**      An anchor represents a region of a hypertext document which is linked
**      to another anchor in the same or a different document.
*/


#ifndef HTANCHOR_H
#define HTANCHOR_H

/* Version 0 (TBL) written in Objective-C for the NeXT browser */
/* Version 1 of 24-Oct-1991 (JFG), written in C, browser-independant */

#include "HTList.h"
#include "HTAtom.h"

#ifdef SHORT_NAMES
#define HTAnchor_findChild                      HTAnFiCh
#define HTAnchor_findChildAndLink               HTAnFiLi
#define HTAnchor_findAddress                    HTAnFiAd
#define HTAnchor_delete                         HTAnDele
#define HTAnchor_makeLastChild                  HTAnMaLa
#define HTAnchor_parent                         HTAnPare
#define HTAnchor_setDocument                    HTAnSeDo
#define HTAnchor_document                       HTAnDocu
#define HTAnchor_setFormat                      HTAnSeFo
#define HTAnchor_format                         HTAnForm
#define HTAnchor_setIndex                       HTAnSeIn
#define HTAnchor_isIndex                        HTAnIsIn
#define HTAnchor_address                        HTAnAddr
#define HTAnchor_hasChildren                    HTAnHaCh
#define HTAnchor_title                          HTAnTitl
#define HTAnchor_setTitle                       HTAnSeTi
#define HTAnchor_appendTitle                    HTAnApTi
#define HTAnchor_link                           HTAnLink
#define HTAnchor_followMainLink                 HTAnFoMa
#define HTAnchor_followTypedLink                HTAnFoTy
#define HTAnchor_makeMainLink                   HTAnMaMa
#define HTAnchor_setProtocol                    HTAnSePr
#define HTAnchor_protocol                       HTAnProt
#define HTAnchor_physical                       HTAnPhys
#define HTAnchor_setPhysical                    HTAnSePh
#define HTAnchor_methods                        HtAnMeth
#endif

/*                      Main definition of anchor
**                      =========================
*/


typedef struct _HyperDoc HyperDoc;  /* Ready for forward references */
typedef struct _HTAnchor HTAnchor;
typedef struct _HTParentAnchor HTParentAnchor;

/*      After definition of HTFormat: */
#include "HTFormat.h"

typedef HTAtom HTLinkType;

typedef struct {
  HTAnchor *    dest;           /* The anchor to which this leads */
  HTLinkType *  type;           /* Semantics of this link */
} HTLink;

struct _HTAnchor {              /* Generic anchor : just links */
  HTLink        mainLink;       /* Main (or default) destination of this */
  HTList *      links;          /* List of extra links from this, if any */
  /* We separate the first link from the others to avoid too many small mallocs
     involved by a list creation. Most anchors only point to one place. */

  HTParentAnchor * parent;      /* Parent of this anchor (self for adults) */
};

struct _HTParentAnchor {
  /* Common part from the generic anchor structure */
  HTLink        mainLink;       /* Main (or default) destination of this */
  HTList *      links;          /* List of extra links from this, if any */
  HTParentAnchor * parent;      /* Parent of this anchor (self) */

  /* ParentAnchor-specific information */
  HTList *      children;       /* Subanchors of this, if any */
  HTList *      sources;        /* List of anchors pointing to this, if any */
  HyperDoc *    document;       /* The document within which this is an anchor */
  char *        address;        /* Absolute address of this node */
  HTFormat      format;         /* Pointer to node format descriptor */
  BOOL          isIndex;        /* Acceptance of a keyword search */
  char *        title;          /* Title of document */

  HTList*       methods;        /* Methods available as HTAtoms */
  void *        protocol;       /* Protocol object */
  char *        physical;       /* Physical address */
};

typedef struct {
  /* Common part from the generic anchor structure */
  HTLink        mainLink;       /* Main (or default) destination of this */
  HTList *      links;          /* List of extra links from this, if any */
  HTParentAnchor * parent;      /* Parent of this anchor */

  /* ChildAnchor-specific information */
  char *        tag;            /* Address of this anchor relative to parent */
} HTChildAnchor;


/*      Create new or find old sub-anchor
**      ---------------------------------
**
**      This one is for a new anchor being edited into an existing
**      document. The parent anchor must already exist.
*/


extern HTChildAnchor * HTAnchor_findChild
  PARAMS(
     (HTParentAnchor *parent,
      CONST char *tag)
  );

/*      Create or find a child anchor with a possible link
**      --------------------------------------------------
**
**      Create new anchor with a given parent and possibly
**      a name, and possibly a link to a _relatively_ named anchor.
**      (Code originally in ParseHTML.h)
*/

extern HTChildAnchor * HTAnchor_findChildAndLink
  PARAMS((
      HTParentAnchor * parent,  /* May not be 0 */
      CONST char * tag,         /* May be "" or 0 */
      CONST char * href,        /* May be "" or 0 */
      HTLinkType * ltype        /* May be 0 */
  ));


/*      Create new or find old named anchor
**      -----------------------------------
**
**      This one is for a reference which is found in a document, and might
**      not be already loaded.
**      Note: You are not guaranteed a new anchor -- you might get an old one,
**      like with fonts.
*/


extern HTAnchor * HTAnchor_findAddress
  PARAMS(
     (CONST char * address)
     );


/*      Delete an anchor and possibly related things (auto garbage collection)
**      --------------------------------------------
**
**      The anchor is only deleted if the corresponding document is not loaded.
**      All outgoing links from parent and children are deleted, and this anchor
**      is removed from the sources list of all its targets.
**      We also try to delete the targets whose documents are not loaded.
**      If this anchor's source list is empty, we delete it and its children.
*/


extern BOOL HTAnchor_delete
  PARAMS(
     (HTParentAnchor *me)
     );


/*              Move an anchor to the head of the list of its siblings
**              ------------------------------------------------------
**
**      This is to ensure that an anchor which might have already existed
**      is put in the correct order as we load the document.
*/


extern void HTAnchor_makeLastChild
  PARAMS(
     (HTChildAnchor *me)
     );

/*      Data access functions
**      ---------------------
*/


extern HTParentAnchor * HTAnchor_parent
  PARAMS(
     (HTAnchor *me)
     );

extern void HTAnchor_setDocument
  PARAMS(
     (HTParentAnchor *me, HyperDoc *doc)
     );

extern HyperDoc * HTAnchor_document
  PARAMS(
     (HTParentAnchor *me)
     );
/* We don't want code to change an address after anchor creation... yet ?
extern void HTAnchor_setAddress
  PARAMS(
     (HTAnchor *me, char *addr)
     );
*/


/*      Returns the full URI of the anchor, child or parent
**      as a malloc'd string to be freed by the caller.
*/

extern char * HTAnchor_address
  PARAMS(
     (HTAnchor *me)
     );

extern void HTAnchor_setFormat
  PARAMS(
     (HTParentAnchor *me, HTFormat form)
     );

extern HTFormat HTAnchor_format
  PARAMS(
     (HTParentAnchor *me)
     );

extern void HTAnchor_setIndex
  PARAMS(
     (HTParentAnchor *me)
     );

extern BOOL HTAnchor_isIndex
  PARAMS(
     (HTParentAnchor *me)
     );

extern BOOL HTAnchor_hasChildren
  PARAMS(
     (HTParentAnchor *me)
     );

/*      Title handling
*/

extern CONST char * HTAnchor_title
  PARAMS(
     (HTParentAnchor *me)
     );

extern void HTAnchor_setTitle
  PARAMS(
     (HTParentAnchor *me, CONST char * title)
     );

extern void HTAnchor_appendTitle
  PARAMS(
     (HTParentAnchor *me, CONST char * title)
     );

/*      Link this Anchor to another given one
**      -------------------------------------
*/


extern BOOL HTAnchor_link
  PARAMS(
     (HTAnchor *source, HTAnchor *destination, HTLinkType *type)
     );

/*      Manipulation of links
**      ---------------------
*/


extern HTAnchor * HTAnchor_followMainLink
  PARAMS(
     (HTAnchor *me)
     );

extern HTAnchor * HTAnchor_followTypedLink
  PARAMS(
     (HTAnchor *me, HTLinkType *type)
     );

extern BOOL HTAnchor_makeMainLink
  PARAMS(
     (HTAnchor *me, HTLink *movingLink)
     );

/*      Read and write methods
**      ----------------------
*/

extern HTList * HTAnchor_methods PARAMS((HTParentAnchor *me));

/*      Protocol
**      --------
*/

extern void * HTAnchor_protocol PARAMS((HTParentAnchor * me));
extern void HTAnchor_setProtocol PARAMS((HTParentAnchor * me,
                                        void* protocol));

/*      Physical address
**      ----------------
*/

extern char * HTAnchor_physical PARAMS((HTParentAnchor * me));
extern void HTAnchor_setPhysical PARAMS((HTParentAnchor * me,
                                        char * protocol));

#endif /* HTANCHOR_H */

/*

    */