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