elst.h

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/**********************************************************************
 * File:        elst.h  (Formerly elist.h)
 * Description: Embedded list module include file.
 * Author:      Phil Cheatle
 * Created:     Mon Jan 07 08:35:34 GMT 1991
 *
 * (C) Copyright 1991, Hewlett-Packard Ltd.
 ** Licensed under the Apache License, Version 2.0 (the "License");
 ** you may not use this file except in compliance with the License.
 ** You may obtain a copy of the License at
 ** http://www.apache.org/licenses/LICENSE-2.0
 ** Unless required by applicable law or agreed to in writing, software
 ** distributed under the License is distributed on an "AS IS" BASIS,
 ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 ** See the License for the specific language governing permissions and
 ** limitations under the License.
 *
 **********************************************************************/

#ifndef ELST_H
#define ELST_H

#include <stdio.h>
#include "host.h"
#include "serialis.h"
#include "lsterr.h"

class ELIST_ITERATOR;

/**********************************************************************
This module implements list classes and iterators.
The following list types and iterators are provided:

  List type        List Class      Iterator Class     Element Class
  ---------			----------		--------------		-------------

    Embedded list		ELIST
              ELIST_ITERATOR
              ELIST_LINK
    (Single linked)

    Embedded list		ELIST2
              ELIST2_ITERATOR
              ELIST2_LINK
    (Double linked)

    Cons List			CLIST
              CLIST_ITERATOR
              CLIST_LINK
    (Single linked)

    Cons List			CLIST2
              CLIST2_ITERATOR
              CLIST2_LINK
    (Double linked)

An embedded list is where the list pointers are provided by a generic class.
Data types to be listed inherit from the generic class.  Data is thus linked
in only ONE list at any one time.

A cons list has a separate structure for a "cons cell".  This contains the
list pointer(s) AND a pointer to the data structure held on the list.  A
structure can be on many cons lists at the same time, and the structure does
not need to inherit from any generic class in order to be on the list.

The implementation of lists is very careful about space and speed overheads.
This is why many embedded lists are provided. The same concerns mean that
in-line type coercion is done, rather than use virtual functions.  This is
cumbersome in that each data type to be listed requires its own iterator and
list class - though macros can gererate these.  It also prevents heterogenous
lists.
**********************************************************************/

/**********************************************************************
 *							CLASS - ELIST_LINK
 *
 *							Generic link class for singly linked lists with embedded links
 *
 *  Note:  No destructor - elements are assumed to be destroyed EITHER after
 *  they have been extracted from a list OR by the ELIST destructor which
 *  walks the list.
 **********************************************************************/

class DLLSYM ELIST_LINK
{
  friend class ELIST_ITERATOR;
  friend class ELIST;

  ELIST_LINK *next;

  public:
    ELIST_LINK() {
      next = NULL;
    }
    //constructor

    ELIST_LINK(                       //copy constructor
               const ELIST_LINK &) {  //dont copy link
      next = NULL;
    }

    void operator= (             //dont copy links
    const ELIST_LINK &) {
      next = NULL;
    }

    void serialise_asc(  //serialise to ascii
                       FILE *f);
    void de_serialise_asc(  //de-serialise from ascii
                          FILE *f);

    /* NOTE that none of the serialise member functions are required for
    ELIST_LINKS as they are never serialised.  (We demand that the derived
    class terminates recursion - just to make sure that it defines the member
    functions anyway.)
    */
};

/**********************************************************************
 * CLASS - ELIST
 *
 * Generic list class for singly linked lists with embedded links
 **********************************************************************/

class DLLSYM ELIST
{
  friend class ELIST_ITERATOR;

  ELIST_LINK *last;              //End of list
  //(Points to head)
  ELIST_LINK *First() {  // return first
    return last ? last->next : NULL;
  }

  public:
    ELIST() {  //constructor
      last = NULL;
    }

    void internal_clear (        //destroy all links
                                 //ptr to zapper functn
      void (*zapper) (ELIST_LINK *));

    BOOL8 empty() {  //is list empty?
      return !last;
    }

    BOOL8 singleton() {
      return last ? (last == last->next) : FALSE;
    }

    void shallow_copy(                     //dangerous!!
                      ELIST *from_list) {  //beware destructors!!
      last = from_list->last;
    }

                                 //ptr to copier functn
    void internal_deep_copy (ELIST_LINK * (*copier) (ELIST_LINK *),
      const ELIST * list);       //list being copied

    void assign_to_sublist(                           //to this list
                           ELIST_ITERATOR *start_it,  //from list start
                           ELIST_ITERATOR *end_it);   //from list end

    INT32 length();  //# elements in list

    void sort (                  //sort elements
      int comparator (           //comparison routine
      const void *, const void *));

    void internal_dump (         //serialise each elem
      FILE * f,                  //to this file
      void element_serialiser (  //using this function
      FILE *, ELIST_LINK *));

    void internal_de_dump (      //de_serial each elem
      FILE * f,                  //from this file
                                 //using this function
      ELIST_LINK * element_de_serialiser (
      FILE *));

    void prep_serialise();  //change last to count

    /*  Note that dump() and de_dump() are not required as calls to dump/de_dump a
      list class should be handled by a class derived from this.

      make_serialise is not required for a similar reason.
    */
};

/***********************************************************************
 *							CLASS - ELIST_ITERATOR
 *
 *							Generic iterator class for singly linked lists with embedded links
 **********************************************************************/

class DLLSYM ELIST_ITERATOR
{
  friend void ELIST::assign_to_sublist(ELIST_ITERATOR *, ELIST_ITERATOR *);

  ELIST *list;                   //List being iterated
  ELIST_LINK *prev;              //prev element
  ELIST_LINK *current;           //current element
  ELIST_LINK *next;              //next element
  BOOL8 ex_current_was_last;     //current extracted
  //was end of list
  BOOL8 ex_current_was_cycle_pt; //current extracted
  //was cycle point
  ELIST_LINK *cycle_pt;          //point we are cycling
  //the list to.
  BOOL8 started_cycling;         //Have we moved off
  //the start?

  ELIST_LINK *extract_sublist(                            //from this current...
                              ELIST_ITERATOR *other_it);  //to other current

  public:
    ELIST_ITERATOR() {  //constructor
      list = NULL;
    }                            //unassigned list

    ELIST_ITERATOR(  //constructor
                   ELIST *list_to_iterate);

    void set_to_list(  //change list
                     ELIST *list_to_iterate);

    void add_after_then_move(                        //add after current &
                             ELIST_LINK *new_link);  //move to new

    void add_after_stay_put(                        //add after current &
                            ELIST_LINK *new_link);  //stay at current

    void add_before_then_move(                        //add before current &
                              ELIST_LINK *new_link);  //move to new

    void add_before_stay_put(                        //add before current &
                             ELIST_LINK *new_link);  //stay at current

    void add_list_after(                      //add a list &
                        ELIST *list_to_add);  //stay at current

    void add_list_before(                      //add a list &
                         ELIST *list_to_add);  //move to it 1st item

    ELIST_LINK *data() {  //get current data
    #ifdef _DEBUG
      if (!list)
        NO_LIST.error ("ELIST_ITERATOR::data", ABORT, NULL);
      if (!current)
        NULL_DATA.error ("ELIST_ITERATOR::data", ABORT, NULL);
    #endif
      return current;
    }

    ELIST_LINK *data_relative(               //get data + or - ...
                              INT8 offset);  //offset from current

    ELIST_LINK *forward();  //move to next element

    ELIST_LINK *extract();  //remove from list

    ELIST_LINK *move_to_first();  //go to start of list

    ELIST_LINK *move_to_last();  //go to end of list

    void mark_cycle_pt();  //remember current

    BOOL8 empty() {  //is list empty?
    #ifdef _DEBUG
      if (!list)
        NO_LIST.error ("ELIST_ITERATOR::empty", ABORT, NULL);
    #endif
      return list->empty ();
    }

    BOOL8 current_extracted() {  //current extracted?
      return !current;
    }

    BOOL8 at_first();  //Current is first?

    BOOL8 at_last();  //Current is last?

    BOOL8 cycled_list();  //Completed a cycle?

    void add_to_end(                        //add at end &
                    ELIST_LINK *new_link);  //dont move

    void exchange(                            //positions of 2 links
                  ELIST_ITERATOR *other_it);  //other iterator

    INT32 length();  //# elements in list

    void sort (                  //sort elements
      int comparator (           //comparison routine
      const void *, const void *));

};

/***********************************************************************
 *							ELIST_ITERATOR::set_to_list
 *
 *  (Re-)initialise the iterator to point to the start of the list_to_iterate
 *  over.
 **********************************************************************/

inline void ELIST_ITERATOR::set_to_list(  //change list
                                        ELIST *list_to_iterate) {
  #ifdef _DEBUG
  if (!this)
    NULL_OBJECT.error ("ELIST_ITERATOR::set_to_list", ABORT, NULL);
  if (!list_to_iterate)
    BAD_PARAMETER.error ("ELIST_ITERATOR::set_to_list", ABORT,
      "list_to_iterate is NULL");
  #endif

  list = list_to_iterate;
  prev = list->last;
  current = list->First ();
  next = current ? current->next : NULL;
  cycle_pt = NULL;               //await explicit set
  started_cycling = FALSE;
  ex_current_was_last = FALSE;
  ex_current_was_cycle_pt = FALSE;
}


/***********************************************************************
 *							ELIST_ITERATOR::ELIST_ITERATOR
 *
 *  CONSTRUCTOR - set iterator to specified list;
 **********************************************************************/

inline ELIST_ITERATOR::ELIST_ITERATOR(ELIST *list_to_iterate) {
  set_to_list(list_to_iterate);
}


/***********************************************************************
 *							ELIST_ITERATOR::add_after_then_move
 *
 *  Add a new element to the list after the current element and move the
 *  iterator to the new element.
 **********************************************************************/

inline void ELIST_ITERATOR::add_after_then_move(  // element to add
                                                ELIST_LINK *new_element) {
  #ifdef _DEBUG
  if (!this)
    NULL_OBJECT.error ("ELIST_ITERATOR::add_after_then_move", ABORT, NULL);
  if (!list)
    NO_LIST.error ("ELIST_ITERATOR::add_after_then_move", ABORT, NULL);
  if (!new_element)
    BAD_PARAMETER.error ("ELIST_ITERATOR::add_after_then_move", ABORT,
      "new_element is NULL");
  if (new_element->next)
    STILL_LINKED.error ("ELIST_ITERATOR::add_after_then_move", ABORT, NULL);
  #endif

  if (list->empty ()) {
    new_element->next = new_element;
    list->last = new_element;
    prev = next = new_element;
  }
  else {
    new_element->next = next;

    if (current) {               //not extracted
      current->next = new_element;
      prev = current;
      if (current == list->last)
        list->last = new_element;
    }
    else {                       //current extracted
      prev->next = new_element;
      if (ex_current_was_last)
        list->last = new_element;
      if (ex_current_was_cycle_pt)
        cycle_pt = new_element;
    }
  }
  current = new_element;