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 struct isl_token *isl_stream_next_token(struct isl_stream *s)
 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                 return s->tokens[--s->n_token];
 157
 158         s->len = 0;
 159
 160         /* skip spaces and comment lines */
 161         while ((c = isl_stream_getc(s)) != -1) {
 162                 if (c == '#') {
 163                         while ((c = isl_stream_getc(s)) != -1 && c != '\n')
 164                                 /* nothing */
 165                                 ;
 166                         if (c == -1)
 167                                 break;
 168                 } else if (!isspace(c))
 169                         break;
 170         }
 171
 172         line = s->line;
 173         col = s->col;
 174
 175         if (c == -1)
 176                 return NULL;
 177         if (c == '(' ||
 178             c == ')' ||
 179             c == '+' ||
 180             c == '/' ||
 181             c == '*' ||
 182             c == '^' ||
 183             c == '=' ||
 184             c == ',' ||
 185             c == ':' ||
 186             c == '[' ||
 187             c == ']' ||
 188             c == '{' ||
 189             c == '}') {
 190                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 191                 if (!tok)
 192                         return NULL;
 193                 tok->type = (enum isl_token_type)c;
 194                 return tok;
 195         }
 196         if (c == '-') {
 197                 int c;
 198                 if ((c = isl_stream_getc(s)) == '>') {
 199                         tok = isl_token_new(s->ctx, line, col, old_line != line);
 200                         if (!tok)
 201                                 return NULL;
 202                         tok->type = ISL_TOKEN_TO;
 203                         return tok;
 204                 }
 205                 if (c != -1)
 206                         isl_stream_ungetc(s, c);
 207                 if (!isdigit(c)) {
 208                         tok = isl_token_new(s->ctx, line, col, old_line != line);
 209                         if (!tok)
 210                                 return NULL;
 211                         tok->type = (enum isl_token_type) '-';
 212                         return tok;
 213                 }
 214         }
 215         if (c == '-' || isdigit(c)) {
 216                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 217                 if (!tok)
 218                         return NULL;
 219                 tok->type = ISL_TOKEN_VALUE;
 220                 isl_int_init(tok->u.v);
 221                 if (isl_stream_push_char(s, c))
 222                         goto error;
 223                 while ((c = isl_stream_getc(s)) != -1 && isdigit(c))
 224                         if (isl_stream_push_char(s, c))
 225                                 goto error;
 226                 if (c != -1)
 227                         isl_stream_ungetc(s, c);
 228                 isl_stream_push_char(s, '\0');
 229                 isl_int_read(tok->u.v, s->buffer);
 230                 return tok;
 231         }
 232         if (isalpha(c)) {
 233                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 234                 if (!tok)
 235                         return NULL;
 236                 isl_stream_push_char(s, c);
 237                 while ((c = isl_stream_getc(s)) != -1 && isalnum(c))
 238                         isl_stream_push_char(s, c);
 239                 if (c != -1)
 240                         isl_stream_ungetc(s, c);
 241                 isl_stream_push_char(s, '\0');
 242                 if (!strcasecmp(s->buffer, "exists"))
 243                         tok->type = ISL_TOKEN_EXISTS;
 244                 else if (!strcasecmp(s->buffer, "and"))
 245                         tok->type = ISL_TOKEN_AND;
 246                 else if (!strcasecmp(s->buffer, "or"))
 247                         tok->type = ISL_TOKEN_OR;
 248                 else {
 249                         tok->type = ISL_TOKEN_IDENT;
 250                         tok->u.s = strdup(s->buffer);
 251                 }
 252                 return tok;
 253         }
 254         if (c == '>') {
 255                 int c;
 256                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 257                 if (!tok)
 258                         return NULL;
 259                 if ((c = isl_stream_getc(s)) == '=') {
 260                         tok->type = ISL_TOKEN_GE;
 261                         return tok;
 262                 }
 263                 if (c != -1)
 264                         isl_stream_ungetc(s, c);
 265                 tok->type = ISL_TOKEN_GT;
 266                 return tok;
 267         }
 268         if (c == '<') {
 269                 int c;
 270                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 271                 if (!tok)
 272                         return NULL;
 273                 if ((c = isl_stream_getc(s)) == '=') {
 274                         tok->type = ISL_TOKEN_LE;
 275                         return tok;
 276                 }
 277                 if (c != -1)
 278                         isl_stream_ungetc(s, c);
 279                 tok->type = ISL_TOKEN_LT;
 280                 return tok;
 281         }
 282         if (c == '&') {
 283                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 284                 if (!tok)
 285                         return NULL;
 286                 tok->type = ISL_TOKEN_AND;
 287                 if ((c = isl_stream_getc(s)) != '&' && c != -1)
 288                         isl_stream_ungetc(s, c);
 289                 return tok;
 290         }
 291         if (c == '|') {
 292                 tok = isl_token_new(s->ctx, line, col, old_line != line);
 293                 if (!tok)
 294                         return NULL;
 295                 tok->type = ISL_TOKEN_OR;
 296                 if ((c = isl_stream_getc(s)) != '|' && c != -1)
 297                         isl_stream_ungetc(s, c);
 298                 return tok;
 299         }
 300
 301         tok = isl_token_new(s->ctx, line, col, old_line != line);
 302         if (!tok)
 303                 return NULL;
 304         tok->type = ISL_TOKEN_UNKNOWN;
 305         return tok;
 306 error:
 307         isl_token_free(tok);
 308         return NULL;
 309 }
 310
 311 int isl_stream_eat(struct isl_stream *s, int type)
 312 {
 313         struct isl_token *tok;
 314
 315         tok = isl_stream_next_token(s);
 316         if (!tok)
 317                 return -1;
 318         if (tok->type == type) {
 319                 isl_token_free(tok);
 320                 return 0;
 321         }
 322         isl_stream_error(s, tok, "expecting other token");
 323         isl_stream_push_token(s, tok);
 324         return -1;
 325 }
 326
 327 void isl_stream_free(struct isl_stream *s)
 328 {
 329         if (!s)
 330                 return;
 331         free(s->buffer);
 332         if (s->n_token != 0) {
 333                 struct isl_token *tok = isl_stream_next_token(s);
 334                 isl_stream_error(s, tok, "unexpected token");
 335                 isl_token_free(tok);
 336         }
 337         isl_ctx_deref(s->ctx);
 338         free(s);
 339 }