mm.c

   1 /*
   2  * Copyright (C) 2007 Andre Noll <maan@tuebingen.mpg.de>
   3  *
   4  * Licensed under the GPL v2. For licencing details see COPYING.
   5  */
   6
   7 /** \file mm.c Paraslash's mood methods. */
   8
   9 #include <regex.h>
  10 #include <fnmatch.h>
  11 #include <osl.h>
  12
  13 #include "para.h"
  14 #include "error.h"
  15 #include "string.h"
  16 #include "afh.h"
  17 #include "afs.h"
  18 #include "mm.h"
  19
  20 /** The comparators for numeric mood methods (year, bitrate, ...). */
  21 #define MOOD_COMPARATORS \
  22         MC(LESS, <) \
  23         MC(LESS_OR_EQUAL, <=) \
  24         MC(EQUAL, =) \
  25         MC(EQUAL2, ==) \
  26         MC(NOT_EQUAL, !=) \
  27         MC(NOT_EQUAL2, <>) \
  28         MC(GREATER, >) \
  29         MC(GREATER_OR_EQUAL, >=) \
  30
  31 /** Prefix mood comparator name with "_MC", example: MC_LESS. */
  32 #define MC(a, b) MC_ ## a,
  33 /** Each mood comparator is identified by an integer of this type. */
  34 enum mood_comparator_id {MOOD_COMPARATORS NUM_MOOD_COMPARATORS};
  35 #undef MC
  36 /** Stringfied mood comparator, example: "<". */
  37 #define MC(a, b) # b,
  38 /** Array of mood comparators represented as C strings ("<", "<=", ...). */
  39 static const char *mood_comparators[] = {MOOD_COMPARATORS};
  40 #undef MC
  41
  42 static int parse_mood_comparator(const char *word)
  43 {
  44         int i;
  45
  46         for (i = 0; i < NUM_MOOD_COMPARATORS; i++)
  47                 if (!strcmp(word, mood_comparators[i]))
  48                         return i;
  49         return -E_MOOD_SYNTAX;
  50 }
  51
  52 struct mm_compare_num_data {
  53         /** <, <=, =, !=, >=, or >. */
  54         enum mood_comparator_id id;
  55         /** The value given at the mood line. */
  56         int32_t arg;
  57 };
  58
  59 static int mm_compare_num_score_function(int32_t val,
  60                 const struct mm_compare_num_data *cnd)
  61 {
  62         int res;
  63         int32_t arg = cnd->arg;
  64
  65         switch (cnd->id) {
  66         case MC_LESS:
  67                 res = val < arg; break;
  68         case MC_LESS_OR_EQUAL:
  69                 res = val <= arg; break;
  70         case MC_EQUAL:
  71         case MC_EQUAL2:
  72                 res = val == arg; break;
  73         case MC_NOT_EQUAL:
  74         case MC_NOT_EQUAL2:
  75                 res = val != arg; break;
  76         case MC_GREATER:
  77                 res = val > arg; break;
  78         case MC_GREATER_OR_EQUAL:
  79                 res = val >= arg; break;
  80         default:
  81                 PARA_EMERG_LOG("BUG: invalid mood comparator\n");
  82                 exit(EXIT_FAILURE);
  83         }
  84         return res? 100 : -100;
  85 }
  86
  87 static int mm_compare_num_parser(int argc, char **argv, void **private)
  88 {
  89         int ret;
  90         enum mood_comparator_id id;
  91         int32_t arg;
  92         struct mm_compare_num_data *cnd;
  93         if (argc != 2)
  94                 return -E_MOOD_SYNTAX;
  95         ret = parse_mood_comparator(argv[1]);
  96         if (ret < 0)
  97                 return ret;
  98         id = ret;
  99         ret = para_atoi32(argv[2], &arg);
 100         if (ret < 0)
 101                 return ret;
 102         cnd = para_malloc(sizeof(struct mm_compare_num_data));
 103         cnd->id = id;
 104         cnd->arg = arg;
 105         *private = cnd;
 106         return 1;
 107 }
 108
 109 static int mm_regex_parser(int argc, char **argv, void **private)
 110 {
 111         regex_t *preg;
 112         int ret;
 113
 114         if (argc != 1)
 115                 return -E_MOOD_SYNTAX;
 116         preg = para_malloc(sizeof(*preg));
 117         ret = para_regcomp(preg, argv[1], REG_EXTENDED | REG_NOSUB);
 118         if (ret < 0) {
 119                 free(preg);
 120                 return ret;
 121         }
 122         *private = preg;
 123         return 1;
 124 }
 125
 126 static int mm_regex_score_function(const regex_t *preg, const char *pattern)
 127 {
 128         return regexec(preg, pattern, 0, NULL, 0) == 0? 100 : -100;
 129 }
 130
 131 static void mm_regex_cleanup(void *private)
 132 {
 133         regex_t *preg = private;
 134         regfree(preg);
 135         free(preg);
 136 }
 137
 138 static int mm_artist_matches_score_function(__a_unused const char *path,
 139                 __a_unused const struct afs_info *afsi,
 140                 const struct afh_info *afhi,
 141                 const void *private)
 142 {
 143         return mm_regex_score_function(private, afhi->tags.artist);
 144 }
 145
 146 static int mm_title_matches_score_function(__a_unused const char *path,
 147                 __a_unused const struct afs_info *afsi,
 148                 const struct afh_info *afhi,
 149                 const void *private)
 150 {
 151         return mm_regex_score_function(private, afhi->tags.title);
 152 }
 153
 154 static int mm_album_matches_score_function(__a_unused const char *path,
 155                 __a_unused const struct afs_info *afsi,
 156                 const struct afh_info *afhi,
 157                 const void *private)
 158 {
 159         return mm_regex_score_function(private, afhi->tags.album);
 160 }
 161
 162 static int mm_comment_matches_score_function(__a_unused const char *path,
 163                 __a_unused const struct afs_info *afsi,
 164                 const struct afh_info *afhi,
 165                 const void *private)
 166 {
 167         return mm_regex_score_function(private, afhi->tags.comment);
 168 }
 169
 170 static int mm_bitrate_score_function(__a_unused const char *path,
 171                 __a_unused const struct afs_info *afsi,
 172                 const struct afh_info *afhi,
 173                 const void *private)
 174 {
 175         return mm_compare_num_score_function(afhi->bitrate, private);
 176 }
 177
 178 static int mm_frequency_score_function(__a_unused const char *path,
 179                 __a_unused const struct afs_info *afsi,
 180                 const struct afh_info *afhi,
 181                 const void *private)
 182 {
 183         return mm_compare_num_score_function(afhi->frequency, private);
 184 }
 185
 186 static int mm_channels_score_function(__a_unused const char *path,
 187                 __a_unused const struct afs_info *afsi,
 188                 const struct afh_info *afhi,
 189                 const void *private)
 190 {
 191         return mm_compare_num_score_function(afhi->channels, private);
 192 }
 193
 194 static int mm_num_played_score_function(__a_unused const char *path,
 195                 const struct afs_info *afsi,
 196                 __a_unused const struct afh_info *afhi,
 197                 const void *private)
 198 {
 199         return mm_compare_num_score_function(afsi->num_played, private);
 200 }
 201
 202 struct mm_year_data {
 203         /** Comparator and year given at the mood line. */
 204         struct mm_compare_num_data *cnd;
 205         /** Used to detect Y2K issues. */
 206         int32_t current_year;
 207 };
 208
 209 static int mm_year_parser(int argc, char **argv, void **private)
 210 {
 211         int ret;
 212         struct mm_year_data *mmyd = para_malloc(sizeof(*mmyd));
 213         time_t current_time;
 214         struct tm *gmt;
 215
 216         ret = mm_compare_num_parser(argc, argv, (void **)&mmyd->cnd);
 217         if (ret < 0)
 218                 goto err;
 219         current_time = time(NULL);
 220         gmt = gmtime(&current_time);
 221         /* tm_year is the number of years since 1900 */
 222         mmyd->current_year = gmt->tm_year + 1900;
 223         *private = mmyd;
 224         return 1;
 225 err:
 226         free(mmyd);
 227         return ret;
 228 }
 229
 230 static int mm_year_score_function(__a_unused const char *path,
 231                 __a_unused const struct afs_info *afsi,
 232                 const struct afh_info *afhi,
 233                 const void *private)
 234 {
 235         const struct mm_year_data *mmyd = private;
 236         int32_t tag_year;
 237         int ret = para_atoi32(afhi->tags.year, &tag_year);
 238
 239         if (ret < 0) /* year tag not present or not a number */
 240                 return -100;
 241         if (tag_year < 0)
 242                 return -100;
 243         /* try to work around Y2K issues */
 244         if (tag_year < 100) {
 245                 tag_year += 1900;
 246                 if (tag_year + 100 <= mmyd->current_year)
 247                         tag_year += 100; /* assume tag_year >= 2000 */
 248         }
 249         return mm_compare_num_score_function(tag_year, mmyd->cnd);
 250 }
 251
 252 static void mm_year_cleanup(void *private)
 253 {
 254         struct mm_year_data *mmyd = private;
 255
 256         free(mmyd->cnd);
 257         free(mmyd);
 258 }
 259
 260 static int mm_no_attributes_set_parser(int argc, __a_unused char **argv,
 261                 __a_unused void **ignored)
 262 {
 263         return argc? -E_MOOD_SYNTAX : 1;
 264 }
 265
 266 static int mm_no_attributes_set_score_function(__a_unused const char *path,
 267                 const struct afs_info *afsi,
 268                 __a_unused const struct afh_info *afhi,
 269                 __a_unused const void *data)
 270 {
 271         if (!afsi->attributes)
 272                 return 100;
 273         return -100;
 274 }
 275
 276 static int mm_path_matches_score_function(const char *path,
 277                 __a_unused const struct afs_info *afsi,
 278                 __a_unused const struct afh_info *afhi,
 279                 const void *data)
 280 {
 281         if (fnmatch(data, path, 0))
 282                 return -100;
 283         return 100;
 284 }
 285
 286 static int mm_path_matches_parser(int argc, char **argv, void **data)
 287 {
 288         if (argc != 1)
 289                 return -E_MOOD_SYNTAX;
 290         *data = para_strdup(argv[1]);
 291         return 1;
 292 }
 293
 294 static void mm_path_matches_cleanup(void *data)
 295 {
 296         free(data);
 297 }
 298
 299 static int mm_is_set_parser(int argc, char **argv, void **bitnum)
 300 {
 301         int ret;
 302         unsigned char c, *res;
 303
 304         if (argc != 1)
 305                 return -E_MOOD_SYNTAX;
 306         ret = get_attribute_bitnum_by_name(argv[1], &c);
 307         if (ret < 0)
 308                 return ret;
 309         res = para_malloc(1);
 310         *res = c;
 311         *bitnum = res;
 312         return 1;
 313 }
 314
 315 static int mm_is_set_score_function(__a_unused const char *path,
 316                 __a_unused const struct afs_info *afsi,
 317                 __a_unused const struct afh_info *afhi,
 318                 const void *data)
 319 {
 320         const unsigned char *bn = data;
 321         if (afsi->attributes & (1ULL << *bn))
 322                 return 100;
 323         return -100;
 324 }
 325
 326 #define DEFINE_MOOD_METHOD(_name) \
 327 .parser = mm_ ## _name ## _parser, \
 328 .score_function = mm_ ## _name ## _score_function, \
 329 .name = #_name
 330
 331 #define DEFINE_MOOD_METHOD_WITH_CLEANUP(_name) \
 332         DEFINE_MOOD_METHOD(_name), \
 333         .cleanup = mm_ ## _name ## _cleanup
 334
 335 #define DEFINE_REGEX_MOOD_METHOD(_name) \
 336         .name = #_name, \
 337         .parser = mm_regex_parser, \
 338         .score_function = mm_ ## _name ## _score_function, \
 339         .cleanup = mm_regex_cleanup
 340
 341 #define DEFINE_COMPARE_NUM_MOOD_METHOD(_name) \
 342         .name = #_name, \
 343         .parser = mm_compare_num_parser, \
 344         .score_function = mm_ ## _name ## _score_function
 345
 346 const struct mood_method mood_methods[] = {
 347         {DEFINE_MOOD_METHOD(no_attributes_set)},
 348         {DEFINE_MOOD_METHOD(is_set)},
 349         {DEFINE_MOOD_METHOD_WITH_CLEANUP(path_matches)},
 350         {DEFINE_MOOD_METHOD_WITH_CLEANUP(year)},
 351         {DEFINE_REGEX_MOOD_METHOD(artist_matches)},
 352         {DEFINE_REGEX_MOOD_METHOD(title_matches)},
 353         {DEFINE_REGEX_MOOD_METHOD(album_matches)},
 354         {DEFINE_REGEX_MOOD_METHOD(comment_matches)},
 355         {DEFINE_COMPARE_NUM_MOOD_METHOD(bitrate)},
 356         {DEFINE_COMPARE_NUM_MOOD_METHOD(frequency)},
 357         {DEFINE_COMPARE_NUM_MOOD_METHOD(channels)},
 358         {DEFINE_COMPARE_NUM_MOOD_METHOD(num_played)},
 359         {.parser = NULL}
 360 };