awesome/common/array.h

/*
 * array.h - useful array handling header
 *
 * Copyright © 2009 Julien Danjou <julien@danjou.info>
 * Copyright © 2008 Pierre Habouzit <madcoder@debian.org>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 */

#ifndef AWESOME_COMMON_ARRAY_H
#define AWESOME_COMMON_ARRAY_H

#include <stdlib.h>

#include "common/util.h"

/** Common array type */
#define ARRAY_TYPE(type_t, pfx)                                             \
    typedef struct pfx##_array_t {                                          \
        type_t *tab;                                                        \
        int len, size;                                                      \
    } pfx##_array_t;

#define foreach(var, array) \
    for(int __foreach_index_##var = 0; \
        __foreach_index_##var < (array).len; \
        __foreach_index_##var = (array).len) \
        for(typeof((array).tab) var = &(array).tab[__foreach_index_##var];  \
            (__foreach_index_##var < (array).len) &&                        \
            (var = &(array).tab[__foreach_index_##var]);                    \
            ++__foreach_index_##var)

#define foreach_reverse(var, array) \
    for(int __foreach_index_##var = (array).len-1; \
        __foreach_index_##var > -1; \
        __foreach_index_##var = -1) \
        for(typeof((array).tab) var = &(array).tab[__foreach_index_##var];  \
            (__foreach_index_##var > -1) &&                                 \
            (var = &(array).tab[__foreach_index_##var]);                    \
            --__foreach_index_##var)

/** Common array functions */
#define ARRAY_COMMON_FUNCS(type_t, pfx, dtor)                               \
    static inline pfx##_array_t * pfx##_array_new(void) {                   \
        return p_new(pfx##_array_t, 1);                                     \
    }                                                                       \
    static inline void pfx##_array_init(pfx##_array_t *arr) {               \
        p_clear(arr, 1);                                                    \
    }                                                                       \
    static inline void pfx##_array_wipe(pfx##_array_t *arr) {               \
        for (int i = 0; i < arr->len; i++) {                                \
            dtor(&arr->tab[i]);                                             \
        }                                                                   \
        p_delete(&arr->tab);                                                \
    }                                                                       \
    static inline void pfx##_array_delete(pfx##_array_t **arrp) {           \
        if (*arrp) {                                                        \
            pfx##_array_wipe(*arrp);                                        \
            p_delete(arrp);                                                 \
        }                                                                   \
    }                                                                       \
                                                                            \
    static inline void pfx##_array_grow(pfx##_array_t *arr, int newlen) {   \
        p_grow(&arr->tab, newlen, &arr->size);                              \
    }                                                                       \
    static inline void                                                      \
    pfx##_array_splice(pfx##_array_t *arr, int pos, int len,                \
                       type_t items[], int count)                           \
    {                                                                       \
        assert (pos >= 0 && len >= 0 && count >= 0);                        \
        assert (pos <= arr->len && pos + len <= arr->len);                  \
        if (len != count) {                                                 \
            pfx##_array_grow(arr, arr->len + count - len);                  \
            memmove(arr->tab + pos + count, arr->tab + pos + len,           \
                    (arr->len - pos - len) * sizeof(*items));               \
            arr->len += count - len;                                        \
        }                                                                   \
        memcpy(arr->tab + pos, items, count * sizeof(*items));              \
    }                                                                       \
    static inline type_t pfx##_array_take(pfx##_array_t *arr, int pos) {    \
        type_t res = arr->tab[pos];                                         \
        pfx##_array_splice(arr, pos, 1, NULL, 0);                           \
        return res;                                                         \
    }                                                                       \
    static inline int pfx##_array_indexof(pfx##_array_t *arr, type_t *e)    \
    {                                                                       \
        return e - arr->tab;                                                \
    }                                                                       \
    static inline type_t pfx##_array_remove(pfx##_array_t *arr, type_t *e)  \
    {                                                                       \
        return pfx##_array_take(arr, pfx##_array_indexof(arr, e));          \
    }

/** Non-ordered array functions */
#define ARRAY_FUNCS(type_t, pfx, dtor)                                      \
    ARRAY_COMMON_FUNCS(type_t, pfx, dtor)                                   \
    static inline void                                                      \
    pfx##_array_push(pfx##_array_t *arr, type_t e)                          \
    {                                                                       \
        pfx##_array_splice(arr, 0, 0, &e, 1);                               \
    }                                                                       \
    static inline void pfx##_array_append(pfx##_array_t *arr, type_t e) {   \
        pfx##_array_splice(arr, arr->len, 0, &e, 1);                        \
    }                                                                       \

/** Binary ordered array functions */
#define BARRAY_FUNCS(type_t, pfx, dtor, cmp)                                \
    ARRAY_COMMON_FUNCS(type_t, pfx, dtor)                                   \
    static inline void                                                      \
    pfx##_array_insert(pfx##_array_t *arr, type_t e)                        \
    {                                                                       \
        int l = 0, r = arr->len;                                            \
        while(l < r)                                                        \
        {                                                                   \
            int i = (r + l) / 2;                                            \
            int res = cmp(&e, &arr->tab[i]);                                \
            if(res == 0)                                                    \
                return; /* Already added, ignore */                         \
            if(res < 0)                                                     \
                r = i;                                                      \
            else                                                            \
                l = i + 1;                                                  \
        }                                                                   \
        pfx##_array_splice(arr, r, 0, &e, 1);                               \
    }                                                                       \
    static inline type_t *                                                  \
    pfx##_array_lookup(pfx##_array_t *arr, type_t *e)                       \
    {                                                                       \
        return bsearch(e, arr->tab, arr->len, sizeof(type_t), cmp);         \
    }

#define DO_ARRAY(type_t, pfx, dtor)                                         \
    ARRAY_TYPE(type_t, pfx) \
    ARRAY_FUNCS(type_t, pfx, dtor)

#define DO_BARRAY(type_t, pfx, dtor, cmp)                                   \
    ARRAY_TYPE(type_t, pfx) \
    BARRAY_FUNCS(type_t, pfx, dtor, cmp)

#endif
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