isl_stream.c

   1 /*
   2  * Copyright 2008-2009 Katholieke Universiteit Leuven
   3  *
   4  * Use of this software is governed by the GNU LGPLv2.1 license
   5  *
   6  * Written by Sven Verdoolaege, K.U.Leuven, Departement
   7  * Computerwetenschappen, Celestijnenlaan 200A, B-3001 Leuven, Belgium
   8  */
   9
  10 #include <ctype.h>
  11 #include <string.h>
  12 #include <strings.h>
  13 #include <isl_ctx.h>
  14 #include "isl_stream.h"
  15
  16 static struct isl_token *isl_token_new(struct isl_ctx *ctx,
  17         int line, int col, unsigned on_new_line)
  18 {
  19         struct isl_token *tok = isl_alloc_type(ctx, struct isl_token);
  20         if (!tok)
  21                 return NULL;
  22         tok->line = line;
  23         tok->col = col;
  24         tok->on_new_line = on_new_line;
  25         return tok;
  26 }
  27
  28 void isl_token_free(struct isl_token *tok)
  29 {
  30         if (!tok)
  31                 return;
  32         if (tok->type == ISL_TOKEN_VALUE)
  33                 isl_int_clear(tok->u.v);
  34         else if (tok->type == ISL_TOKEN_IDENT)
  35                 free(tok->u.s);
  36         free(tok);
  37 }
  38
  39 void isl_stream_error(struct isl_stream *s, struct isl_token *tok, char *msg)
  40 {
  41         int line = tok ? tok->line : s->line;
  42         int col = tok ? tok->col : s->col;
  43         fprintf(stderr, "syntax error (%d, %d): %s\n", line, col, msg);
  44         if (tok) {
  45                 if (tok->type < 256)
  46                         fprintf(stderr, "got '%c'\n", tok->type);
  47                 else
  48                         fprintf(stderr, "got token type %d\n", tok->type);
  49         }
  50 }
  51
  52 static struct isl_stream* isl_stream_new(struct isl_ctx *ctx)
  53 {
  54         int i;
  55         struct isl_stream *s = isl_alloc_type(ctx, struct isl_stream);
  56         if (!s)
  57                 return NULL;
  58         s->ctx = ctx;
  59         isl_ctx_ref(s->ctx);
  60         s->size = 256;
  61         s->file = NULL;
  62         s->str = NULL;
  63         s->buffer = isl_alloc_array(ctx, char, s->size);
  64         if (!s->buffer)
  65                 goto error;
  66         s->len = 0;
  67         s->line = 1;
  68         s->col = 0;
  69         s->eof = 0;
  70         s->c = -1;
  71         for (i = 0; i < 5; ++i)
  72                 s->tokens[i] = NULL;
  73         s->n_token = 0;
  74         return s;
  75 error:
  76         isl_stream_free(s);
  77         return NULL;
  78 }
  79
  80 struct isl_stream* isl_stream_new_file(struct isl_ctx *ctx, FILE *file)
  81 {
  82         struct isl_stream *s = isl_stream_new(ctx);
  83         if (!s)
  84                 return NULL;
  85         s->file = file;
  86         return s;
  87 }
  88
  89 struct isl_stream* isl_stream_new_str(struct isl_ctx *ctx, const char *str)
  90 {
  91     struct isl_stream *s = isl_stream_new(ctx);
  92     s->str = str;
  93     return s;
  94 }
  95
  96 static int isl_stream_getc(struct isl_stream *s)
  97 {
  98         int c;
  99         if (s->eof)
 100                 return -1;
 101         if (s->file)
 102                 c = fgetc(s->file);
 103         else {
 104                 c = *s->str++;
 105                 if (c == '\0')
 106                         c = -1;
 107         }
 108         if (c == -1)
 109                 s->eof = 1;
 110         if (!s->eof) {
 111                 if (s->c == '\n') {
 112                         s->line++;
 113                         s->col = 0;
 114                 } else
 115                         s->col++;
 116         }
 117         s->c = c;
 118         return c;
 119 }
 120
 121 static void isl_stream_ungetc(struct isl_stream *s, int c)
 122 {
 123         if (s->file)
 124                 ungetc(c, s->file);
 125         else
 126                 --s->str;
 127         s->c = -1;
 128 }
 129
 130 static int isl_stream_push_char(struct isl_stream *s, int c)
 131 {
 132         if (s->len >= s->size) {
 133                 s->size = (3*s->size)/2;
 134                 s->buffer = isl_realloc_array(ctx, s->buffer, char, s->size);
 135                 if (!s->buffer)
 136                         return -1;
 137         }
 138         s->buffer[s->len++] = c;
 139         return 0;
 140 }
 141
 142 void isl_stream_push_token(struct isl_stream *s, struct isl_token *tok)
 143 {
 144         isl_assert(s->ctx, s->n_token < 5, return);
 145         s->tokens[s->n_token++] = tok;
 146 }
 147
 148 static struct isl_token *next_token(struct isl_stream *s, int same_line)
 149 {
 150         int c;
 151         struct isl_token *tok = NULL;
 152         int line, col;
 153         int old_line = s->line;
 154
 155         if (s->n_token) {
 156                 if (same_line && s->tokens[s->n_token - 1]->on_new_line)
 157                         return NULL;
 158                 return s->tokens[--s->n_token];
 159         }
 160
 161         if (same_line && s->c == '\n')
 162                 return NULL;
 163
 164         s->len = 0;
 165
 166         /* skip spaces and comment lines */
 167         while ((c = isl_stream_getc(s)) != -1) {
 168                 if (c == '#') {
 169                         while ((c = isl_stream_getc(s)) != -1 && c != '\n')
 170                                 /* nothing */
 171                                 ;
 172                         if (c == -1 || (same_line && c == '\n'))
 173                                 break;
 174                 } else if (!isspace(c) || (same_line && c == '\n'))
 175                         break;
 176         }
 177
 178         line = s->line;
 179         col = s->col;
 180
 181         if (c == -1 || (same_line && c == '\n'))
 182                 return NULL;
 183         if (c == '(' ||
 184             c == ')' ||
 185             c == '+' ||
 186             c == '/' ||
 187             c == '*' ||
 188             c == '^' ||
 189             c == '=' ||
 190             c == ',' ||
 191             c == ':' ||
 192             c == ';' ||
 193             c == '[' ||
 194             c == ']' ||
 195             c == '{' ||
 196             c == '}') {
 197                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 198                 if (!tok)
 199                         return NULL;
 200                 tok->type = (enum isl_token_type)c;
 201                 return tok;
 202         }
 203         if (c == '-') {
 204                 int c;
 205                 if ((c = isl_stream_getc(s)) == '>') {
 206                         tok = isl_token_new(s->ctx, line, col, old_line != line);
 207                         if (!tok)
 208                                 return NULL;
 209                         tok->type = ISL_TOKEN_TO;
 210                         return tok;
 211                 }
 212                 if (c != -1)
 213                         isl_stream_ungetc(s, c);
 214                 if (!isdigit(c)) {
 215                         tok = isl_token_new(s->ctx, line, col, old_line != line);
 216                         if (!tok)
 217                                 return NULL;
 218                         tok->type = (enum isl_token_type) '-';
 219                         return tok;
 220                 }
 221         }
 222         if (c == '-' || isdigit(c)) {
 223                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 224                 if (!tok)
 225                         return NULL;
 226                 tok->type = ISL_TOKEN_VALUE;
 227                 isl_int_init(tok->u.v);
 228                 if (isl_stream_push_char(s, c))
 229                         goto error;
 230                 while ((c = isl_stream_getc(s)) != -1 && isdigit(c))
 231                         if (isl_stream_push_char(s, c))
 232                                 goto error;
 233                 if (c != -1)
 234                         isl_stream_ungetc(s, c);
 235                 isl_stream_push_char(s, '\0');
 236                 isl_int_read(tok->u.v, s->buffer);
 237                 return tok;
 238         }
 239         if (isalpha(c)) {
 240                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 241                 if (!tok)
 242                         return NULL;
 243                 isl_stream_push_char(s, c);
 244                 while ((c = isl_stream_getc(s)) != -1 && isalnum(c))
 245                         isl_stream_push_char(s, c);
 246                 if (c != -1)
 247                         isl_stream_ungetc(s, c);
 248                 while ((c = isl_stream_getc(s)) != -1 && c == '\'')
 249                         isl_stream_push_char(s, c);
 250                 if (c != -1)
 251                         isl_stream_ungetc(s, c);
 252                 isl_stream_push_char(s, '\0');
 253                 if (!strcasecmp(s->buffer, "exists"))
 254                         tok->type = ISL_TOKEN_EXISTS;
 255                 else if (!strcasecmp(s->buffer, "and"))
 256                         tok->type = ISL_TOKEN_AND;
 257                 else if (!strcasecmp(s->buffer, "or"))
 258                         tok->type = ISL_TOKEN_OR;
 259                 else {
 260                         tok->type = ISL_TOKEN_IDENT;
 261                         tok->u.s = strdup(s->buffer);
 262                 }
 263                 return tok;
 264         }
 265         if (c == '>') {
 266                 int c;
 267                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 268                 if (!tok)
 269                         return NULL;
 270                 if ((c = isl_stream_getc(s)) == '=') {
 271                         tok->type = ISL_TOKEN_GE;
 272                         return tok;
 273                 }
 274                 if (c != -1)
 275                         isl_stream_ungetc(s, c);
 276                 tok->type = ISL_TOKEN_GT;
 277                 return tok;
 278         }
 279         if (c == '<') {
 280                 int c;
 281                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 282                 if (!tok)
 283                         return NULL;
 284                 if ((c = isl_stream_getc(s)) == '=') {
 285                         tok->type = ISL_TOKEN_LE;
 286                         return tok;
 287                 }
 288                 if (c != -1)
 289                         isl_stream_ungetc(s, c);
 290                 tok->type = ISL_TOKEN_LT;
 291                 return tok;
 292         }
 293         if (c == '&') {
 294                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 295                 if (!tok)
 296                         return NULL;
 297                 tok->type = ISL_TOKEN_AND;
 298                 if ((c = isl_stream_getc(s)) != '&' && c != -1)
 299                         isl_stream_ungetc(s, c);
 300                 return tok;
 301         }
 302         if (c == '|') {
 303                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 304                 if (!tok)
 305                         return NULL;
 306                 tok->type = ISL_TOKEN_OR;
 307                 if ((c = isl_stream_getc(s)) != '|' && c != -1)
 308                         isl_stream_ungetc(s, c);
 309                 return tok;
 310         }
 311
 312         tok = isl_token_new(s->ctx, line, col, old_line != line);
 313         if (!tok)
 314                 return NULL;
 315         tok->type = ISL_TOKEN_UNKNOWN;
 316         return tok;
 317 error:
 318         isl_token_free(tok);
 319         return NULL;
 320 }
 321
 322 struct isl_token *isl_stream_next_token(struct isl_stream *s)
 323 {
 324         return next_token(s, 0);
 325 }
 326
 327 struct isl_token *isl_stream_next_token_on_same_line(struct isl_stream *s)
 328 {
 329         return next_token(s, 1);
 330 }
 331
 332 int isl_stream_eat(struct isl_stream *s, int type)
 333 {
 334         struct isl_token *tok;
 335
 336         tok = isl_stream_next_token(s);
 337         if (!tok)
 338                 return -1;
 339         if (tok->type == type) {
 340                 isl_token_free(tok);
 341                 return 0;
 342         }
 343         isl_stream_error(s, tok, "expecting other token");
 344         isl_stream_push_token(s, tok);
 345         return -1;
 346 }
 347
 348 void isl_stream_free(struct isl_stream *s)
 349 {
 350         if (!s)
 351                 return;
 352         free(s->buffer);
 353         if (s->n_token != 0) {
 354                 struct isl_token *tok = isl_stream_next_token(s);
 355                 isl_stream_error(s, tok, "unexpected token");
 356                 isl_token_free(tok);
 357         }
 358         isl_ctx_deref(s->ctx);
 359         free(s);
 360 }