isl_input.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  * Copyright 2010      INRIA Saclay
   4  *
   5  * Use of this software is governed by the GNU LGPLv2.1 license
   6  *
   7  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   8  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   9  * and INRIA Saclay - Ile-de-France, Parc Club Orsay Universite,
  10  * ZAC des vignes, 4 rue Jacques Monod, 91893 Orsay, France
  11  */
  12
  13 #include <ctype.h>
  14 #include <stdio.h>
  15 #include <string.h>
  16 #include <strings.h>
  17 #include <isl_set.h>
  18 #include <isl_seq.h>
  19 #include "isl_stream.h"
  20 #include "isl_map_private.h"
  21
  22 struct variable {
  23         char                    *name;
  24         int                      pos;
  25         struct variable         *next;
  26 };
  27
  28 struct vars {
  29         struct isl_ctx  *ctx;
  30         int              n;
  31         struct variable *v;
  32 };
  33
  34 static struct vars *vars_new(struct isl_ctx *ctx)
  35 {
  36         struct vars *v;
  37         v = isl_alloc_type(ctx, struct vars);
  38         if (!v)
  39                 return NULL;
  40         v->ctx = ctx;
  41         v->n = 0;
  42         v->v = NULL;
  43         return v;
  44 }
  45
  46 static void variable_free(struct variable *var)
  47 {
  48         while (var) {
  49                 struct variable *next = var->next;
  50                 free(var->name);
  51                 free(var);
  52                 var = next;
  53         }
  54 }
  55
  56 static void vars_free(struct vars *v)
  57 {
  58         if (!v)
  59                 return;
  60         variable_free(v->v);
  61         free(v);
  62 }
  63
  64 static struct variable *variable_new(struct vars *v, const char *name, int len,
  65                                 int pos)
  66 {
  67         struct variable *var;
  68         var = isl_alloc_type(v->ctx, struct variable);
  69         if (!var)
  70                 goto error;
  71         var->name = strdup(name);
  72         var->name[len] = '\0';
  73         var->pos = pos;
  74         var->next = v->v;
  75         return var;
  76 error:
  77         variable_free(v->v);
  78         return NULL;
  79 }
  80
  81 static int vars_pos(struct vars *v, const char *s, int len)
  82 {
  83         int pos;
  84         struct variable *q;
  85
  86         if (len == -1)
  87                 len = strlen(s);
  88         for (q = v->v; q; q = q->next) {
  89                 if (strncmp(q->name, s, len) == 0 && q->name[len] == '\0')
  90                         break;
  91         }
  92         if (q)
  93                 pos = q->pos;
  94         else {
  95                 pos = v->n;
  96                 v->v = variable_new(v, s, len, v->n);
  97                 if (!v->v)
  98                         return -1;
  99                 v->n++;
 100         }
 101         return pos;
 102 }
 103
 104 static struct vars *read_var_list(struct isl_stream *s, struct vars *v)
 105 {
 106         struct isl_token *tok;
 107
 108         while ((tok = isl_stream_next_token(s)) != NULL) {
 109                 int p;
 110                 int n = v->n;
 111
 112                 if (tok->type != ISL_TOKEN_IDENT)
 113                         break;
 114
 115                 p = vars_pos(v, tok->u.s, -1);
 116                 if (p < 0)
 117                         goto error;
 118                 if (p < n) {
 119                         isl_stream_error(s, tok, "expecting unique identifier");
 120                         goto error;
 121                 }
 122                 isl_token_free(tok);
 123                 tok = isl_stream_next_token(s);
 124                 if (!tok || tok->type != ',')
 125                         break;
 126
 127                 isl_token_free(tok);
 128         }
 129         if (tok)
 130                 isl_stream_push_token(s, tok);
 131
 132         return v;
 133 error:
 134         isl_token_free(tok);
 135         vars_free(v);
 136         return NULL;
 137 }
 138
 139 static struct isl_vec *accept_affine(struct isl_stream *s, struct vars *v)
 140 {
 141         struct isl_token *tok = NULL;
 142         struct isl_vec *aff;
 143
 144         aff = isl_vec_alloc(v->ctx, 1 + v->n);
 145         isl_seq_clr(aff->el, aff->size);
 146         if (!aff)
 147                 return NULL;
 148
 149         for (;;) {
 150                 tok = isl_stream_next_token(s);
 151                 if (!tok) {
 152                         isl_stream_error(s, NULL, "unexpected EOF");
 153                         goto error;
 154                 }
 155                 if (tok->type == ISL_TOKEN_IDENT) {
 156                         int n = v->n;
 157                         int pos = vars_pos(v, tok->u.s, -1);
 158                         if (pos < 0)
 159                                 goto error;
 160                         if (pos >= n) {
 161                                 isl_stream_error(s, tok, "unknown identifier");
 162                                 goto error;
 163                         }
 164                         isl_int_add_ui(aff->el[1 + pos], aff->el[1 + pos], 1);
 165                 } else if (tok->type == ISL_TOKEN_VALUE) {
 166                         struct isl_token *tok2;
 167                         int n = v->n;
 168                         int pos = -1;
 169                         tok2 = isl_stream_next_token(s);
 170                         if (tok2 && tok2->type == ISL_TOKEN_IDENT) {
 171                                 pos = vars_pos(v, tok2->u.s, -1);
 172                                 if (pos < 0)
 173                                         goto error;
 174                                 if (pos >= n) {
 175                                         isl_stream_error(s, tok2,
 176                                                 "unknown identifier");
 177                                         isl_token_free(tok2);
 178                                         goto error;
 179                                 }
 180                                 isl_token_free(tok2);
 181                         } else if (tok2)
 182                                 isl_stream_push_token(s, tok2);
 183                         isl_int_add(aff->el[1 + pos],
 184                                         aff->el[1 + pos], tok->u.v);
 185                 } else if (tok->type == '+') {
 186                         /* nothing */
 187                 } else {
 188                         isl_stream_push_token(s, tok);
 189                         break;
 190                 }
 191                 isl_token_free(tok);
 192         }
 193
 194         return aff;
 195 error:
 196         isl_vec_free(aff);
 197         return NULL;
 198 }
 199
 200 static struct isl_basic_map *add_div_definition(struct isl_stream *s,
 201         struct vars *v, struct isl_basic_map *bmap, int k)
 202 {
 203         struct isl_token *tok;
 204         int seen_paren = 0;
 205         struct isl_vec *aff;
 206
 207         if (isl_stream_eat(s, '['))
 208                 goto error;
 209
 210         tok = isl_stream_next_token(s);
 211         if (!tok)
 212                 goto error;
 213         if (tok->type == '(') {
 214                 seen_paren = 1;
 215                 isl_token_free(tok);
 216         } else
 217                 isl_stream_push_token(s, tok);
 218
 219         aff = accept_affine(s, v);
 220         if (!aff)
 221                 goto error;
 222
 223         isl_seq_cpy(bmap->div[k] + 1, aff->el, aff->size);
 224
 225         isl_vec_free(aff);
 226
 227         if (seen_paren && isl_stream_eat(s, ')'))
 228                 goto error;
 229         if (isl_stream_eat(s, '/'))
 230                 goto error;
 231
 232         tok = isl_stream_next_token(s);
 233         if (!tok)
 234                 goto error;
 235         if (tok->type != ISL_TOKEN_VALUE) {
 236                 isl_stream_error(s, tok, "expected denominator");
 237                 isl_stream_push_token(s, tok);
 238                 goto error;
 239         }
 240         isl_int_set(bmap->div[k][0], tok->u.v);
 241         isl_token_free(tok);
 242
 243         if (isl_stream_eat(s, ']'))
 244                 goto error;
 245
 246         if (isl_basic_map_add_div_constraints(bmap, k) < 0)
 247                 goto error;
 248
 249         return bmap;
 250 error:
 251         isl_basic_map_free(bmap);
 252         return NULL;
 253 }
 254
 255 static struct isl_basic_map *read_defined_var_list(struct isl_stream *s,
 256         struct vars *v, struct isl_basic_map *bmap)
 257 {
 258         struct isl_token *tok;
 259
 260         while ((tok = isl_stream_next_token(s)) != NULL) {
 261                 int k;
 262                 int p;
 263                 int n = v->n;
 264                 unsigned total = isl_basic_map_total_dim(bmap);
 265
 266                 if (tok->type != ISL_TOKEN_IDENT)
 267                         break;
 268
 269                 p = vars_pos(v, tok->u.s, -1);
 270                 if (p < 0)
 271                         goto error;
 272                 if (p < n) {
 273                         isl_stream_error(s, tok, "expecting unique identifier");
 274                         goto error;
 275                 }
 276                 isl_token_free(tok);
 277
 278                 bmap = isl_basic_map_cow(bmap);
 279                 bmap = isl_basic_map_extend_dim(bmap, isl_dim_copy(bmap->dim),
 280                                                 1, 0, 2);
 281
 282                 if ((k = isl_basic_map_alloc_div(bmap)) < 0)
 283                         goto error;
 284                 isl_seq_clr(bmap->div[k], 1 + 1 + total);
 285
 286                 tok = isl_stream_next_token(s);
 287                 if (tok && tok->type == '=') {
 288                         isl_token_free(tok);
 289                         bmap = add_div_definition(s, v, bmap, k);
 290                         tok = isl_stream_next_token(s);
 291                 }
 292
 293                 if (!tok || tok->type != ',')
 294                         break;
 295
 296                 isl_token_free(tok);
 297         }
 298         if (tok)
 299                 isl_stream_push_token(s, tok);
 300
 301         return bmap;
 302 error:
 303         isl_token_free(tok);
 304         isl_basic_map_free(bmap);
 305         return NULL;
 306 }
 307
 308 static struct vars *read_tuple(struct isl_stream *s, struct vars *v)
 309 {
 310         struct isl_token *tok;
 311
 312         tok = isl_stream_next_token(s);
 313         if (!tok || tok->type != '[') {
 314                 isl_stream_error(s, tok, "expecting '['");
 315                 goto error;
 316         }
 317         isl_token_free(tok);
 318         v = read_var_list(s, v);
 319         tok = isl_stream_next_token(s);
 320         if (!tok || tok->type != ']') {
 321                 isl_stream_error(s, tok, "expecting ']'");
 322                 goto error;
 323         }
 324         isl_token_free(tok);
 325
 326         return v;
 327 error:
 328         if (tok)
 329                 isl_token_free(tok);
 330         vars_free(v);
 331         return NULL;
 332 }
 333
 334 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 335         struct vars **v, struct isl_basic_map *bmap);
 336
 337 static struct isl_basic_map *add_exists(struct isl_stream *s,
 338         struct vars **v, struct isl_basic_map *bmap)
 339 {
 340         struct isl_token *tok;
 341         int n = (*v)->n;
 342         int extra;
 343         int seen_paren = 0;
 344         int i;
 345         unsigned total;
 346
 347         tok = isl_stream_next_token(s);
 348         if (!tok)
 349                 goto error;
 350         if (tok->type == '(') {
 351                 seen_paren = 1;
 352                 isl_token_free(tok);
 353         } else
 354                 isl_stream_push_token(s, tok);
 355
 356         bmap = read_defined_var_list(s, *v, bmap);
 357         if (!bmap)
 358                 goto error;
 359
 360         if (isl_stream_eat(s, ':'))
 361                 goto error;
 362         bmap = add_constraints(s, v, bmap);
 363         if (seen_paren && isl_stream_eat(s, ')'))
 364                 goto error;
 365         return bmap;
 366 error:
 367         isl_basic_map_free(bmap);
 368         return NULL;
 369 }
 370
 371 static struct isl_basic_map *add_constraint(struct isl_stream *s,
 372         struct vars **v, struct isl_basic_map *bmap)
 373 {
 374         unsigned total = isl_basic_map_total_dim(bmap);
 375         int k;
 376         struct isl_token *tok = NULL;
 377         struct isl_vec *aff1 = NULL, *aff2 = NULL;
 378
 379         tok = isl_stream_next_token(s);
 380         if (!tok)
 381                 goto error;
 382         if (tok->type == ISL_TOKEN_EXISTS) {
 383                 isl_token_free(tok);
 384                 return add_exists(s, v, bmap);
 385         }
 386         isl_stream_push_token(s, tok);
 387         tok = NULL;
 388
 389         bmap = isl_basic_map_cow(bmap);
 390         bmap = isl_basic_map_extend_constraints(bmap, 0, 1);
 391         k = isl_basic_map_alloc_inequality(bmap);
 392         if (k < 0)
 393                 goto error;
 394
 395         aff1 = accept_affine(s, *v);
 396         if (!aff1)
 397                 goto error;
 398         tok = isl_stream_next_token(s);
 399         switch (tok->type) {
 400         case ISL_TOKEN_LE:
 401         case ISL_TOKEN_GE:
 402         case '=':
 403                 break;
 404         default:
 405                 isl_stream_error(s, tok, "missing operator");
 406                 isl_stream_push_token(s, tok);
 407                 tok = NULL;
 408                 goto error;
 409         }
 410         aff2 = accept_affine(s, *v);
 411         if (!aff2)
 412                 goto error;
 413         isl_assert(aff1->ctx, aff1->size == 1 + total, goto error);
 414         isl_assert(aff2->ctx, aff2->size == 1 + total, goto error);
 415
 416         if (tok->type == ISL_TOKEN_LE)
 417                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->negone, aff1->el,
 418                                                (*v)->ctx->one, aff2->el,
 419                                                aff1->size);
 420         else if (tok->type == ISL_TOKEN_GE)
 421                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->one, aff1->el,
 422                                                (*v)->ctx->negone, aff2->el,
 423                                                aff1->size);
 424         else {
 425                 isl_seq_combine(bmap->ineq[k], (*v)->ctx->one, aff1->el,
 426                                                (*v)->ctx->negone, aff2->el,
 427                                                aff1->size);
 428                 isl_basic_map_inequality_to_equality(bmap, k);
 429         }
 430         isl_token_free(tok);
 431         isl_vec_free(aff1);
 432         isl_vec_free(aff2);
 433
 434         return bmap;
 435 error:
 436         if (tok)
 437                 isl_token_free(tok);
 438         isl_vec_free(aff1);
 439         isl_vec_free(aff2);
 440         isl_basic_map_free(bmap);
 441         return NULL;
 442 }
 443
 444 static struct isl_basic_map *add_constraints(struct isl_stream *s,
 445         struct vars **v, struct isl_basic_map *bmap)
 446 {
 447         struct isl_token *tok;
 448
 449         for (;;) {
 450                 bmap = add_constraint(s, v, bmap);
 451                 if (!bmap)
 452                         return NULL;
 453                 tok = isl_stream_next_token(s);
 454                 if (!tok) {
 455                         isl_stream_error(s, NULL, "unexpected EOF");
 456                         goto error;
 457                 }
 458                 if (tok->type != ISL_TOKEN_AND)
 459                         break;
 460                 isl_token_free(tok);
 461         }
 462         isl_stream_push_token(s, tok);
 463
 464         return bmap;
 465 error:
 466         if (tok)
 467                 isl_token_free(tok);
 468         isl_basic_map_free(bmap);
 469         return NULL;
 470 }
 471
 472 static struct isl_basic_map *read_disjunct(struct isl_stream *s,
 473         struct vars **v, __isl_take isl_dim *dim)
 474 {
 475         struct isl_basic_map *bmap;
 476
 477         bmap = isl_basic_map_alloc_dim(dim, 0, 0, 0);
 478         if (!bmap)
 479                 return NULL;
 480
 481         bmap = add_constraints(s, v, bmap);
 482         bmap = isl_basic_map_simplify(bmap);
 483         bmap = isl_basic_map_finalize(bmap);
 484         return bmap;
 485 }
 486
 487 static struct isl_map *read_disjuncts(struct isl_stream *s,
 488         struct vars **v, __isl_take isl_dim *dim)
 489 {
 490         struct isl_token *tok;
 491         struct isl_map *map;
 492
 493         tok = isl_stream_next_token(s);
 494         if (!tok) {
 495                 isl_stream_error(s, NULL, "unexpected EOF");
 496                 goto error;
 497         }
 498         if (tok->type == '}') {
 499                 isl_stream_push_token(s, tok);
 500                 return isl_map_universe(dim);
 501         }
 502         isl_stream_push_token(s, tok);
 503
 504         map = isl_map_empty(isl_dim_copy(dim));
 505         for (;;) {
 506                 struct isl_basic_map *bmap;
 507
 508                 bmap = read_disjunct(s, v, isl_dim_copy(dim));
 509                 map = isl_map_union(map, isl_map_from_basic_map(bmap));
 510
 511                 tok = isl_stream_next_token(s);
 512                 if (!tok || tok->type != ISL_TOKEN_OR)
 513                         break;
 514                 isl_token_free(tok);
 515         }
 516         if (tok)
 517                 isl_stream_push_token(s, tok);
 518
 519         isl_dim_free(dim);
 520         return map;
 521 error:
 522         isl_dim_free(dim);
 523         return NULL;
 524 }
 525
 526 static __isl_give isl_basic_map *basic_map_read_polylib_constraint(
 527         struct isl_stream *s, __isl_take isl_basic_map *bmap)
 528 {
 529         int j;
 530         struct isl_token *tok;
 531         int type;
 532         int k;
 533         isl_int *c;
 534         unsigned nparam;
 535         unsigned dim;
 536
 537         if (!bmap)
 538                 return NULL;
 539
 540         nparam = isl_basic_map_dim(bmap, isl_dim_param);
 541         dim = isl_basic_map_dim(bmap, isl_dim_out);
 542
 543         tok = isl_stream_next_token(s);
 544         if (!tok || tok->type != ISL_TOKEN_VALUE) {
 545                 isl_stream_error(s, tok, "expecting coefficient");
 546                 if (tok)
 547                         isl_stream_push_token(s, tok);
 548                 goto error;
 549         }
 550         if (!tok->on_new_line) {
 551                 isl_stream_error(s, tok, "coefficient should appear on new line");
 552                 isl_stream_push_token(s, tok);
 553                 goto error;
 554         }
 555
 556         type = isl_int_get_si(tok->u.v);
 557         isl_token_free(tok);
 558
 559         isl_assert(s->ctx, type == 0 || type == 1, goto error);
 560         if (type == 0) {
 561                 k = isl_basic_map_alloc_equality(bmap);
 562                 c = bmap->eq[k];
 563         } else {
 564                 k = isl_basic_map_alloc_inequality(bmap);
 565                 c = bmap->ineq[k];
 566         }
 567         if (k < 0)
 568                 goto error;
 569
 570         for (j = 0; j < dim; ++j) {
 571                 tok = isl_stream_next_token(s);
 572                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 573                         isl_stream_error(s, tok, "expecting coefficient");
 574                         if (tok)
 575                                 isl_stream_push_token(s, tok);
 576                         goto error;
 577                 }
 578                 isl_int_set(c[1 + nparam + j], tok->u.v);
 579                 isl_token_free(tok);
 580         }
 581         for (j = 0; j < nparam; ++j) {
 582                 tok = isl_stream_next_token(s);
 583                 if (!tok || tok->type != ISL_TOKEN_VALUE) {
 584                         isl_stream_error(s, tok, "expecting coefficient");
 585                         if (tok)
 586                                 isl_stream_push_token(s, tok);
 587                         goto error;
 588                 }
 589                 isl_int_set(c[1 + j], tok->u.v);
 590                 isl_token_free(tok);
 591         }
 592         tok = isl_stream_next_token(s);
 593         if (!tok || tok->type != ISL_TOKEN_VALUE) {
 594                 isl_stream_error(s, tok, "expecting coefficient");
 595                 if (tok)
 596                         isl_stream_push_token(s, tok);
 597                 goto error;
 598         }
 599         isl_int_set(c[0], tok->u.v);
 600         isl_token_free(tok);
 601
 602         return bmap;
 603 error:
 604         isl_basic_map_free(bmap);
 605         return NULL;
 606 }
 607
 608 static __isl_give isl_basic_map *basic_map_read_polylib(struct isl_stream *s,
 609         int nparam)
 610 {
 611         int i;
 612         struct isl_token *tok;
 613         struct isl_token *tok2;
 614         int n_row, n_col;
 615         int on_new_line;
 616         unsigned dim;
 617         struct isl_basic_map *bmap = NULL;
 618
 619         if (nparam < 0)
 620                 nparam = 0;
 621
 622         tok = isl_stream_next_token(s);
 623         if (!tok) {
 624                 isl_stream_error(s, NULL, "unexpected EOF");
 625                 return NULL;
 626         }
 627         tok2 = isl_stream_next_token(s);
 628         if (!tok2) {
 629                 isl_token_free(tok);
 630                 isl_stream_error(s, NULL, "unexpected EOF");
 631                 return NULL;
 632         }
 633         n_row = isl_int_get_si(tok->u.v);
 634         n_col = isl_int_get_si(tok2->u.v);
 635         on_new_line = tok2->on_new_line;
 636         isl_token_free(tok2);
 637         isl_token_free(tok);
 638         isl_assert(s->ctx, !on_new_line, return NULL);
 639         isl_assert(s->ctx, n_row >= 0, return NULL);
 640         isl_assert(s->ctx, n_col >= 2 + nparam, return NULL);
 641         dim = n_col - 2 - nparam;
 642         bmap = isl_basic_map_alloc(s->ctx, nparam, 0, dim, 0, n_row, n_row);
 643         if (!bmap)
 644                 return NULL;
 645
 646         for (i = 0; i < n_row; ++i)
 647                 bmap = basic_map_read_polylib_constraint(s, bmap);
 648
 649         bmap = isl_basic_map_simplify(bmap);
 650         bmap = isl_basic_map_finalize(bmap);
 651         return bmap;
 652 }
 653
 654 static struct isl_map *map_read_polylib(struct isl_stream *s, int nparam)
 655 {
 656         struct isl_token *tok;
 657         struct isl_token *tok2;
 658         int i, n;
 659         struct isl_map *map;
 660
 661         tok = isl_stream_next_token(s);
 662         if (!tok) {
 663                 isl_stream_error(s, NULL, "unexpected EOF");
 664                 return NULL;
 665         }
 666         tok2 = isl_stream_next_token(s);
 667         if (!tok2) {
 668                 isl_token_free(tok);
 669                 isl_stream_error(s, NULL, "unexpected EOF");
 670                 return NULL;
 671         }
 672         if (!tok2->on_new_line) {
 673                 isl_stream_push_token(s, tok2);
 674                 isl_stream_push_token(s, tok);
 675                 return isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
 676         }
 677         isl_stream_push_token(s, tok2);
 678         n = isl_int_get_si(tok->u.v);
 679         isl_token_free(tok);
 680
 681         isl_assert(s->ctx, n >= 1, return NULL);
 682
 683         map = isl_map_from_basic_map(basic_map_read_polylib(s, nparam));
 684
 685         for (i = 1; i < n; ++i)
 686                 map = isl_map_union(map,
 687                         isl_map_from_basic_map(basic_map_read_polylib(s, nparam)));
 688
 689         return map;
 690 }
 691
 692 static struct isl_dim *set_names(struct isl_dim *dim, struct vars *vars,
 693         enum isl_dim_type type, int offset, int n)
 694 {
 695         int i;
 696         struct variable *v;
 697
 698         for (i = 0, v = vars->v; i < offset; ++i, v = v->next)
 699                 ;
 700         for (i = n - 1; i >= 0; --i, v = v->next)
 701                 dim = isl_dim_set_name(dim, type, i, v->name);
 702
 703         return dim;
 704 }
 705
 706 static struct isl_dim *dim_from_vars(struct vars *vars,
 707         int nparam, int n_in, int n_out)
 708 {
 709         struct isl_dim *dim;
 710
 711         dim = isl_dim_alloc(vars->ctx, nparam, n_in, n_out);
 712         dim = set_names(dim, vars, isl_dim_param, n_out + n_in, nparam);
 713         dim = set_names(dim, vars, isl_dim_in, n_out, n_in);
 714         dim = set_names(dim, vars, isl_dim_out, 0, n_out);
 715
 716         return dim;
 717 }
 718
 719 static struct isl_map *map_read(struct isl_stream *s, int nparam)
 720 {
 721         struct isl_dim *dim = NULL;
 722         struct isl_map *map = NULL;
 723         struct isl_token *tok;
 724         struct vars *v = NULL;
 725         int n1;
 726         int n2;
 727
 728         tok = isl_stream_next_token(s);
 729         if (!tok) {
 730                 isl_stream_error(s, NULL, "unexpected EOF");
 731                 goto error;
 732         }
 733         if (tok->type == ISL_TOKEN_VALUE) {
 734                 isl_stream_push_token(s, tok);
 735                 return map_read_polylib(s, nparam);
 736         }
 737         v = vars_new(s->ctx);
 738         if (tok->type == '[') {
 739                 isl_stream_push_token(s, tok);
 740                 v = read_tuple(s, v);
 741                 if (!v)
 742                         return NULL;
 743                 if (nparam >= 0)
 744                         isl_assert(s->ctx, nparam == v->n, goto error);
 745                 nparam = v->n;
 746                 tok = isl_stream_next_token(s);
 747                 if (!tok || tok->type != ISL_TOKEN_TO) {
 748                         isl_stream_error(s, tok, "expecting '->'");
 749                         if (tok)
 750                                 isl_stream_push_token(s, tok);
 751                         goto error;
 752                 }
 753                 isl_token_free(tok);
 754                 tok = isl_stream_next_token(s);
 755         }
 756         if (nparam < 0)
 757                 nparam = 0;
 758         if (!tok || tok->type != '{') {
 759                 isl_stream_error(s, tok, "expecting '{'");
 760                 if (tok)
 761                         isl_stream_push_token(s, tok);
 762                 goto error;
 763         }
 764         isl_token_free(tok);
 765         v = read_tuple(s, v);
 766         if (!v)
 767                 return NULL;
 768         n1 = v->n - nparam;
 769         tok = isl_stream_next_token(s);
 770         if (tok && tok->type == ISL_TOKEN_TO) {
 771                 isl_token_free(tok);
 772                 v = read_tuple(s, v);
 773                 if (!v)
 774                         return NULL;
 775                 n2 = v->n - n1 - nparam;
 776         } else {
 777                 if (tok)
 778                         isl_stream_push_token(s, tok);
 779                 n2 = n1;
 780                 n1 = 0;
 781         }
 782         dim = dim_from_vars(v, nparam, n1, n2);
 783         tok = isl_stream_next_token(s);
 784         if (!tok) {
 785                 isl_stream_error(s, NULL, "unexpected EOF");
 786                 goto error;
 787         }
 788         if (tok->type == ':') {
 789                 isl_token_free(tok);
 790                 map = read_disjuncts(s, &v, isl_dim_copy(dim));
 791                 tok = isl_stream_next_token(s);
 792         } else
 793                 map = isl_map_universe(isl_dim_copy(dim));
 794         if (tok && tok->type == '}') {
 795                 isl_token_free(tok);
 796         } else {
 797                 isl_stream_error(s, tok, "unexpected isl_token");
 798                 if (tok)
 799                         isl_token_free(tok);
 800                 goto error;
 801         }
 802         vars_free(v);
 803         isl_dim_free(dim);
 804
 805         return map;
 806 error:
 807         isl_dim_free(dim);
 808         isl_map_free(map);
 809         if (v)
 810                 vars_free(v);
 811         return NULL;
 812 }
 813
 814 static struct isl_basic_map *basic_map_read(struct isl_stream *s, int nparam)
 815 {
 816         struct isl_map *map;
 817         struct isl_basic_map *bmap;
 818
 819         map = map_read(s, nparam);
 820         if (!map)
 821                 return NULL;
 822
 823         isl_assert(map->ctx, map->n <= 1, goto error);
 824
 825         if (map->n == 0)
 826                 bmap = isl_basic_map_empty_like_map(map);
 827         else
 828                 bmap = isl_basic_map_copy(map->p[0]);
 829
 830         isl_map_free(map);
 831
 832         return bmap;
 833 error:
 834         isl_map_free(map);
 835         return NULL;
 836 }
 837
 838 __isl_give isl_basic_map *isl_basic_map_read_from_file(isl_ctx *ctx,
 839                 FILE *input, int nparam)
 840 {
 841         struct isl_basic_map *bmap;
 842         struct isl_stream *s = isl_stream_new_file(ctx, input);
 843         if (!s)
 844                 return NULL;
 845         bmap = basic_map_read(s, nparam);
 846         isl_stream_free(s);
 847         return bmap;
 848 }
 849
 850 __isl_give isl_basic_set *isl_basic_set_read_from_file(isl_ctx *ctx,
 851                 FILE *input, int nparam)
 852 {
 853         struct isl_basic_map *bmap;
 854         bmap = isl_basic_map_read_from_file(ctx, input, nparam);
 855         if (!bmap)
 856                 return NULL;
 857         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
 858         return (struct isl_basic_set *)bmap;
 859 error:
 860         isl_basic_map_free(bmap);
 861         return NULL;
 862 }
 863
 864 struct isl_basic_map *isl_basic_map_read_from_str(struct isl_ctx *ctx,
 865                 const char *str, int nparam)
 866 {
 867         struct isl_basic_map *bmap;
 868         struct isl_stream *s = isl_stream_new_str(ctx, str);
 869         if (!s)
 870                 return NULL;
 871         bmap = basic_map_read(s, nparam);
 872         isl_stream_free(s);
 873         return bmap;
 874 }
 875
 876 struct isl_basic_set *isl_basic_set_read_from_str(struct isl_ctx *ctx,
 877                 const char *str, int nparam)
 878 {
 879         struct isl_basic_map *bmap;
 880         bmap = isl_basic_map_read_from_str(ctx, str, nparam);
 881         if (!bmap)
 882                 return NULL;
 883         isl_assert(ctx, isl_basic_map_n_in(bmap) == 0, goto error);
 884         return (struct isl_basic_set *)bmap;
 885 error:
 886         isl_basic_map_free(bmap);
 887         return NULL;
 888 }
 889
 890 __isl_give isl_map *isl_map_read_from_file(struct isl_ctx *ctx,
 891                 FILE *input, int nparam)
 892 {
 893         struct isl_map *map;
 894         struct isl_stream *s = isl_stream_new_file(ctx, input);
 895         if (!s)
 896                 return NULL;
 897         map = map_read(s, nparam);
 898         isl_stream_free(s);
 899         return map;
 900 }
 901
 902 __isl_give isl_map *isl_map_read_from_str(struct isl_ctx *ctx,
 903                 const char *str, int nparam)
 904 {
 905         struct isl_map *map;
 906         struct isl_stream *s = isl_stream_new_str(ctx, str);
 907         if (!s)
 908                 return NULL;
 909         map = map_read(s, nparam);
 910         isl_stream_free(s);
 911         return map;
 912 }
 913
 914 __isl_give isl_set *isl_set_read_from_file(struct isl_ctx *ctx,
 915                 FILE *input, int nparam)
 916 {
 917         struct isl_map *map;
 918         map = isl_map_read_from_file(ctx, input, nparam);
 919         if (!map)
 920                 return NULL;
 921         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
 922         return (struct isl_set *)map;
 923 error:
 924         isl_map_free(map);
 925         return NULL;
 926 }
 927
 928 struct isl_set *isl_set_read_from_str(struct isl_ctx *ctx,
 929                 const char *str, int nparam)
 930 {
 931         struct isl_map *map;
 932         map = isl_map_read_from_str(ctx, str, nparam);
 933         if (!map)
 934                 return NULL;
 935         isl_assert(ctx, isl_map_n_in(map) == 0, goto error);
 936         return (struct isl_set *)map;
 937 error:
 938         isl_map_free(map);
 939         return NULL;
 940 }
 941
 942 static char *next_line(FILE *input, char *line, unsigned len)
 943 {
 944         char *p;
 945
 946         do {
 947                 if (!(p = fgets(line, len, input)))
 948                         return NULL;
 949                 while (isspace(*p) && *p != '\n')
 950                         ++p;
 951         } while (*p == '#' || *p == '\n');
 952
 953         return p;
 954 }
 955
 956 static struct isl_vec *isl_vec_read_from_file_polylib(struct isl_ctx *ctx,
 957                 FILE *input)
 958 {
 959         struct isl_vec *vec = NULL;
 960         char line[1024];
 961         char val[1024];
 962         char *p;
 963         unsigned size;
 964         int j;
 965         int n;
 966         int offset;
 967
 968         isl_assert(ctx, next_line(input, line, sizeof(line)), return NULL);
 969         isl_assert(ctx, sscanf(line, "%u", &size) == 1, return NULL);
 970
 971         vec = isl_vec_alloc(ctx, size);
 972
 973         p = next_line(input, line, sizeof(line));
 974         isl_assert(ctx, p, goto error);
 975
 976         for (j = 0; j < size; ++j) {
 977                 n = sscanf(p, "%s%n", val, &offset);
 978                 isl_assert(ctx, n != 0, goto error);
 979                 isl_int_read(vec->el[j], val);
 980                 p += offset;
 981         }
 982
 983         return vec;
 984 error:
 985         isl_vec_free(vec);
 986         return NULL;
 987 }
 988
 989 struct isl_vec *isl_vec_read_from_file(struct isl_ctx *ctx,
 990                 FILE *input, unsigned input_format)
 991 {
 992         if (input_format == ISL_FORMAT_POLYLIB)
 993                 return isl_vec_read_from_file_polylib(ctx, input);
 994         else
 995                 isl_assert(ctx, 0, return NULL);
 996 }