list.c   [plain text]


/* ----------------------------------------------------------------------------- 
 * list.c
 *
 *     Implements a simple list object.
 * 
 * Author(s) : David Beazley (beazley@cs.uchicago.edu)
 *
 * Copyright (C) 1999-2000.  The University of Chicago
 * See the file LICENSE for information on usage and redistribution.	
 * ----------------------------------------------------------------------------- */

char cvsroot_list_c[] = "$Id: list.c 10926 2008-11-11 22:17:40Z wsfulton $";

#include "dohint.h"

typedef struct List {
  int maxitems;			/* Max size  */
  int nitems;			/* Num items */
  DOH *file;
  int line;
  DOH **items;
} List;

extern DohObjInfo DohListType;

/* Doubles amount of memory in a list */
static
void more(List *l) {
  l->items = (void **) DohRealloc(l->items, l->maxitems * 2 * sizeof(void *));
  assert(l->items);
  l->maxitems *= 2;
}

/* -----------------------------------------------------------------------------
 * CopyList()
 *
 * Make a shallow copy of a list.
 * ----------------------------------------------------------------------------- */
static DOH *CopyList(DOH *lo) {
  List *l, *nl;
  int i;
  l = (List *) ObjData(lo);
  nl = (List *) DohMalloc(sizeof(List));
  nl->nitems = l->nitems;
  nl->maxitems = l->maxitems;
  nl->items = (void **) DohMalloc(l->maxitems * sizeof(void *));
  for (i = 0; i < l->nitems; i++) {
    nl->items[i] = l->items[i];
    Incref(nl->items[i]);
  }
  nl->file = l->file;
  if (nl->file)
    Incref(nl->file);
  nl->line = l->line;
  return DohObjMalloc(&DohListType, nl);
}

/* -----------------------------------------------------------------------------
 * DelList()
 *
 * Delete a list.
 * ----------------------------------------------------------------------------- */

static void DelList(DOH *lo) {
  List *l = (List *) ObjData(lo);
  int i;
  for (i = 0; i < l->nitems; i++)
    Delete(l->items[i]);
  DohFree(l->items);
  DohFree(l);
}

/* -----------------------------------------------------------------------------
 * List_clear()
 *
 * Remove all of the list entries, but keep the list object intact.
 * ----------------------------------------------------------------------------- */

static void List_clear(DOH *lo) {
  List *l = (List *) ObjData(lo);
  int i;
  for (i = 0; i < l->nitems; i++) {
    Delete(l->items[i]);
  }
  l->nitems = 0;
}

/* -----------------------------------------------------------------------------
 * List_insert()
 *
 * Insert an item into the list. If the item is not a DOH object, it is assumed
 * to be a 'char *' and is used to construct an equivalent string object.
 * ----------------------------------------------------------------------------- */

static int List_insert(DOH *lo, int pos, DOH *item) {
  List *l = (List *) ObjData(lo);
  int i;

  if (!item)
    return -1;
  if (!DohCheck(item)) {
    item = NewString(item);
    Decref(item);
  }
  if (pos == DOH_END)
    pos = l->nitems;
  if (pos < 0)
    pos = 0;
  if (pos > l->nitems)
    pos = l->nitems;
  if (l->nitems == l->maxitems)
    more(l);
  for (i = l->nitems; i > pos; i--) {
    l->items[i] = l->items[i - 1];
  }
  l->items[pos] = item;
  Incref(item);
  l->nitems++;
  return 0;
}

/* -----------------------------------------------------------------------------
 * List_remove()
 *
 * Remove an item from a list.
 * ----------------------------------------------------------------------------- */

static int List_remove(DOH *lo, int pos) {
  List *l = (List *) ObjData(lo);
  int i;
  if (pos == DOH_END)
    pos = l->nitems - 1;
  if (pos == DOH_BEGIN)
    pos = 0;
  assert(!((pos < 0) || (pos >= l->nitems)));
  Delete(l->items[pos]);
  for (i = pos; i < l->nitems - 1; i++) {
    l->items[i] = l->items[i + 1];
  }
  l->nitems--;
  return 0;
}

/* -----------------------------------------------------------------------------
 * List_len()
 *
 * Return the number of elements in the list
 * ----------------------------------------------------------------------------- */

static int List_len(DOH *lo) {
  List *l = (List *) ObjData(lo);
  return l->nitems;
}

/* -----------------------------------------------------------------------------
 * List_get()
 *
 * Get the nth item from the list.
 * ----------------------------------------------------------------------------- */

static DOH *List_get(DOH *lo, int n) {
  List *l = (List *) ObjData(lo);
  if (n == DOH_END)
    n = l->nitems - 1;
  if (n == DOH_BEGIN)
    n = 0;
  assert(!((n < 0) || (n >= l->nitems)));
  return l->items[n];
}

/* -----------------------------------------------------------------------------
 * List_set()
 *
 * Set the nth item in the list replacing any previous item. 
 * ----------------------------------------------------------------------------- */

static int List_set(DOH *lo, int n, DOH *val) {
  List *l = (List *) ObjData(lo);
  if (!val)
    return -1;
  assert(!((n < 0) || (n >= l->nitems)));
  if (!DohCheck(val)) {
    val = NewString(val);
    Decref(val);
  }
  Delete(l->items[n]);
  l->items[n] = val;
  Incref(val);
  Delete(val);
  return 0;
}

/* -----------------------------------------------------------------------------
 * List_first()
 *
 * Return the first item in the list.
 * ----------------------------------------------------------------------------- */

static DohIterator List_first(DOH *lo) {
  DohIterator iter;
  List *l = (List *) ObjData(lo);
  iter.object = lo;
  iter._index = 0;
  iter._current = 0;
  iter.key = 0;
  if (l->nitems > 0) {
    iter.item = l->items[0];
  } else {
    iter.item = 0;
  }
  return iter;
}

/* -----------------------------------------------------------------------------
 * List_next()
 * 
 * Return the next item in the list.
 * ----------------------------------------------------------------------------- */

static DohIterator List_next(DohIterator iter) {
  List *l = (List *) ObjData(iter.object);
  iter._index = iter._index + 1;
  if (iter._index >= l->nitems) {
    iter.item = 0;
    iter.key = 0;
  } else {
    iter.item = l->items[iter._index];
  }
  return iter;
}

/* -----------------------------------------------------------------------------
 * List_str()
 *
 * Create a string representation of the list.
 * ----------------------------------------------------------------------------- */
static DOH *List_str(DOH *lo) {
  DOH *s;
  int i;
  List *l = (List *) ObjData(lo);
  s = NewStringEmpty();
  if (ObjGetMark(lo)) {
    Printf(s, "List(%x)", lo);
    return s;
  }
  ObjSetMark(lo, 1);
  Printf(s, "List[ ");
  for (i = 0; i < l->nitems; i++) {
    Printf(s, "%s", l->items[i]);
    if ((i + 1) < l->nitems)
      Printf(s, ", ");
  }
  Printf(s, " ]\n");
  ObjSetMark(lo, 0);
  return s;
}

/* -----------------------------------------------------------------------------
 * List_dump()
 *
 * Dump the items to an output stream.
 * ----------------------------------------------------------------------------- */

static int List_dump(DOH *lo, DOH *out) {
  int nsent = 0;
  int i, ret;
  List *l = (List *) ObjData(lo);
  for (i = 0; i < l->nitems; i++) {
    ret = Dump(l->items[i], out);
    if (ret < 0)
      return -1;
    nsent += ret;
  }
  return nsent;
}

static void List_setfile(DOH *lo, DOH *file) {
  DOH *fo;
  List *l = (List *) ObjData(lo);

  if (!DohCheck(file)) {
    fo = NewString(file);
    Decref(fo);
  } else
    fo = file;
  Incref(fo);
  Delete(l->file);
  l->file = fo;
}

static DOH *List_getfile(DOH *lo) {
  List *l = (List *) ObjData(lo);
  return l->file;
}

static void List_setline(DOH *lo, int line) {
  List *l = (List *) ObjData(lo);
  l->line = line;
}

static int List_getline(DOH *lo) {
  List *l = (List *) ObjData(lo);
  return l->line;
}

static DohListMethods ListListMethods = {
  List_get,
  List_set,
  List_remove,
  List_insert,
  0,				/* delslice */
};

DohObjInfo DohListType = {
  "List",			/* objname */
  DelList,			/* doh_del */
  CopyList,			/* doh_copy */
  List_clear,			/* doh_clear */
  List_str,			/* doh_str */
  0,				/* doh_data */
  List_dump,			/* doh_dump */
  List_len,			/* doh_len */
  0,				/* doh_hash    */
  0,				/* doh_cmp */
  0,				/* doh_equal    */
  List_first,			/* doh_first    */
  List_next,			/* doh_next     */
  List_setfile,			/* doh_setfile */
  List_getfile,			/* doh_getfile */
  List_setline,			/* doh_setline */
  List_getline,			/* doh_getline */
  0,				/* doh_mapping */
  &ListListMethods,		/* doh_sequence */
  0,				/* doh_file */
  0,				/* doh_string */
  0,				/* doh_callable */
  0,				/* doh_position */
};

/* -----------------------------------------------------------------------------
 * NewList()
 *
 * Create a new list.
 * ----------------------------------------------------------------------------- */

#define MAXLISTITEMS 8

DOH *DohNewList(void) {
  List *l;
  int i;
  l = (List *) DohMalloc(sizeof(List));
  l->nitems = 0;
  l->maxitems = MAXLISTITEMS;
  l->items = (void **) DohMalloc(l->maxitems * sizeof(void *));
  for (i = 0; i < MAXLISTITEMS; i++) {
    l->items[i] = 0;
  }
  l->file = 0;
  l->line = 0;
  return DohObjMalloc(&DohListType, l);
}

static int (*List_sort_compare_func) (const DOH *, const DOH *);
static int List_qsort_compare(const void *a, const void *b) {
  return List_sort_compare_func(*((DOH **) a), *((DOH **) b));
}

/* Sort a list */
void DohSortList(DOH *lo, int (*cmp) (const DOH *, const DOH *)) {
  List *l = (List *) ObjData(lo);
  if (cmp) {
    List_sort_compare_func = cmp;
  } else {
    List_sort_compare_func = DohCmp;
  }
  qsort(l->items, l->nitems, sizeof(DOH *), List_qsort_compare);
}