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   1 /*
   2  * Copyright © 2017 Keith Packard <keithp@keithp.com>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation, either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful, but
  10  * WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12  * General Public License for more details.
  13  */
  14
  15 #include "ao_scheme.h"
  16
  17 #ifdef AO_SCHEME_FEATURE_VECTOR
  18
  19 static void vector_mark(void *addr)
  20 {
  21         struct ao_scheme_vector *vector = addr;
  22         unsigned int    i;
  23
  24         for (i = 0; i < vector->length; i++) {
  25                 ao_poly v = vector->vals[i];
  26
  27                 ao_scheme_poly_mark(v, 1);
  28         }
  29 }
  30
  31 static int vector_len_size(uint16_t length)
  32 {
  33         return sizeof (struct ao_scheme_vector) + length * sizeof (ao_poly);
  34 }
  35
  36 static int vector_size(void *addr)
  37 {
  38         struct ao_scheme_vector *vector = addr;
  39
  40         return vector_len_size(vector->length);
  41 }
  42
  43 static void vector_move(void *addr)
  44 {
  45         struct ao_scheme_vector *vector = addr;
  46         unsigned int    i;
  47
  48         for (i = 0; i < vector->length; i++)
  49                 (void) ao_scheme_poly_move(&vector->vals[i], 1);
  50 }
  51
  52 const struct ao_scheme_type ao_scheme_vector_type = {
  53         .mark = vector_mark,
  54         .size = vector_size,
  55         .move = vector_move,
  56         .name = "vector",
  57 };
  58
  59 struct ao_scheme_vector *
  60 ao_scheme_vector_alloc(uint16_t length, ao_poly fill)
  61 {
  62         struct ao_scheme_vector *vector;
  63         unsigned int i;
  64
  65         vector = ao_scheme_alloc(vector_len_size(length));
  66         if (!vector)
  67                 return NULL;
  68         vector->type = AO_SCHEME_VECTOR;
  69         vector->length = length;
  70         for (i = 0; i < length; i++)
  71                 vector->vals[i] = fill;
  72         return vector;
  73 }
  74
  75 void
  76 ao_scheme_vector_write(ao_poly v)
  77 {
  78         struct ao_scheme_vector *vector = ao_scheme_poly_vector(v);
  79         unsigned int i;
  80
  81         printf("#(");
  82         for (i = 0; i < vector->length; i++) {
  83                 if (i != 0)
  84                         printf(" ");
  85                 if (vector->vals[i] == v)
  86                         printf ("...");
  87                 else
  88                         ao_scheme_poly_write(vector->vals[i]);
  89         }
  90         printf(")");
  91 }
  92
  93 void
  94 ao_scheme_vector_display(ao_poly v)
  95 {
  96         struct ao_scheme_vector *vector = ao_scheme_poly_vector(v);
  97         unsigned int i;
  98
  99         for (i = 0; i < vector->length; i++) {
 100                 if (vector->vals[i] == v)
 101                         printf("...");
 102                 else
 103                         ao_scheme_poly_display(vector->vals[i]);
 104         }
 105 }
 106
 107 static int32_t
 108 ao_scheme_vector_offset(struct ao_scheme_vector *vector, ao_poly i)
 109 {
 110         bool    fail;
 111         int32_t offset = ao_scheme_poly_integer(i, &fail);
 112
 113         if (fail)
 114                 ao_scheme_error(AO_SCHEME_INVALID, "vector index %v not integer", i);
 115         if (offset < 0 || vector->length <= offset) {
 116                 ao_scheme_error(AO_SCHEME_INVALID, "vector index %v out of range (max %d)",
 117                                 i, vector->length);
 118                 offset = -1;
 119         }
 120         return offset;
 121 }
 122
 123 ao_poly
 124 ao_scheme_vector_get(ao_poly v, ao_poly i)
 125 {
 126         struct ao_scheme_vector *vector = ao_scheme_poly_vector(v);
 127         int32_t                 offset = ao_scheme_vector_offset(vector, i);
 128
 129         if (offset < 0)
 130                 return AO_SCHEME_NIL;
 131         return vector->vals[offset];
 132 }
 133
 134 ao_poly
 135 ao_scheme_vector_set(ao_poly v, ao_poly i, ao_poly p)
 136 {
 137         struct ao_scheme_vector *vector = ao_scheme_poly_vector(v);
 138         int32_t                 offset = ao_scheme_vector_offset(vector, i);
 139
 140         if (offset < 0)
 141                 return AO_SCHEME_NIL;
 142         return vector->vals[offset] = p;
 143 }
 144
 145 struct ao_scheme_vector *
 146 ao_scheme_list_to_vector(struct ao_scheme_cons *cons)
 147 {
 148         uint16_t                length;
 149         uint16_t                i;
 150         struct ao_scheme_vector *vector;
 151
 152         length = (uint16_t) ao_scheme_cons_length (cons);
 153         if (ao_scheme_exception)
 154                 return NULL;
 155
 156         ao_scheme_cons_stash(0, cons);
 157         vector = ao_scheme_vector_alloc(length, AO_SCHEME_NIL);
 158         cons = ao_scheme_cons_fetch(0);
 159         if (!vector)
 160                 return NULL;
 161         i = 0;
 162         while (cons) {
 163                 vector->vals[i++] = cons->car;
 164                 cons = ao_scheme_cons_cdr(cons);
 165         }
 166         return vector;
 167 }
 168
 169 struct ao_scheme_cons *
 170 ao_scheme_vector_to_list(struct ao_scheme_vector *vector)
 171 {
 172         unsigned int            i;
 173         uint16_t                length = vector->length;
 174         struct ao_scheme_cons   *cons = NULL;
 175
 176         for (i = length; i-- > 0;) {
 177                 ao_scheme_poly_stash(2, ao_scheme_vector_poly(vector));
 178                 cons = ao_scheme_cons_cons(vector->vals[i], ao_scheme_cons_poly(cons));
 179                 vector = ao_scheme_poly_vector(ao_scheme_poly_fetch(2));
 180                 if (!cons)
 181                         return NULL;
 182         }
 183         return cons;
 184 }
 185
 186 #endif /* AO_SCHEME_FEATURE_VECTOR */