src/lyxlex_pimpl.C

   1 #include <config.h>
   2
   3 #ifdef __GNUG__
   4 #pragma implementation
   5 #endif
   6 #include <algorithm>
   7
   8 #include "lyxlex_pimpl.h"
   9 #include "support/lyxalgo.h"
  10 #include "support/filetools.h"
  11 #include "debug.h"
  12
  13 using std::sort;
  14 using std::ostream;
  15 using std::ios;
  16 using std::istream;
  17 using std::endl;
  18 using std::lower_bound;
  19
  20 // namespace {
  21 struct compare_tags {
  22         // used by lower_bound
  23         inline
  24         int operator()(keyword_item const & a, char const * const tag) const {
  25                 return compare_no_case(a.tag, tag) < 0;
  26         }
  27         // used by sorted and sort
  28         inline
  29         int operator()(keyword_item const & a, keyword_item const & b) const {
  30                 return compare_no_case(a.tag, b.tag) < 0;
  31         }
  32 };
  33 // } // end of anon namespace
  34
  35
  36 LyXLex::Pimpl::Pimpl(keyword_item * tab, int num)
  37         : is(&fb__), table(tab), no_items(num),
  38           status(0), pushed(0), lineno(0)
  39 {
  40         if (table && !sorted(table, table + no_items, compare_tags())) {
  41                 lyxerr << "The table passed to LyXLex is not sorted!!\n"
  42                        << "Tell the developers to fix it!" << endl;
  43                 // We sort it anyway to avoid problems.
  44                 lyxerr << "\nUnsorted:\n";
  45                 printTable(lyxerr);
  46
  47                 sort(table, table + no_items,
  48                      compare_tags());
  49                 lyxerr << "\nSorted:\n";
  50                 printTable(lyxerr);
  51         }
  52 }
  53
  54
  55 string LyXLex::Pimpl::GetString() const
  56 {
  57         return string(buff);
  58 }
  59
  60
  61 void LyXLex::Pimpl::printError(string const & message) const
  62 {
  63         string tmpmsg = subst(message, "$$Token", GetString());
  64         lyxerr << "LyX: " << tmpmsg << " [around line " << lineno
  65                << " of file " << MakeDisplayPath(name) << ']' << endl;
  66 }
  67
  68
  69 void LyXLex::Pimpl::printTable(ostream & os)
  70 {
  71         os << "\nNumber of tags: " << no_items << '\n';
  72         for(int i= 0; i < no_items; ++i)
  73                 os << "table[" << i
  74                    << "]:  tag: `" << table[i].tag
  75                    << "'  code:" << table[i].code << '\n';
  76         os.flush();
  77 }
  78
  79
  80 void LyXLex::Pimpl::pushTable(keyword_item * tab, int num)
  81 {
  82         pushed_table * tmppu = new pushed_table;
  83         tmppu->next = pushed;
  84         tmppu->table_elem = table;
  85         tmppu->table_siz = no_items;
  86         pushed = tmppu;
  87         table = tab;
  88         no_items = num;
  89         // Check if the table is sorted and if not, sort it.
  90         if (table
  91             && !sorted(table, table + no_items, compare_tags())) {
  92                 lyxerr << "The table passed to LyXLex is not sorted!!\n"
  93                        << "Tell the developers to fix it!" << endl;
  94                 // We sort it anyway to avoid problems.
  95                 lyxerr << "\nUnsorted:\n";
  96                 printTable(lyxerr);
  97
  98                 sort(table, table + no_items, compare_tags());
  99                 lyxerr << "\nSorted:\n";
 100                 printTable(lyxerr);
 101         }
 102 }
 103
 104
 105 void LyXLex::Pimpl::popTable()
 106 {
 107         if (pushed == 0)
 108                 lyxerr << "LyXLex error: nothing to pop!" << endl;
 109
 110         pushed_table * tmp;
 111         tmp = pushed;
 112         table = tmp->table_elem;
 113         no_items = tmp->table_siz;
 114         tmp->table_elem = 0;
 115         pushed = tmp->next;
 116         delete tmp;
 117 }
 118
 119
 120 bool LyXLex::Pimpl::setFile(string const & filename)
 121 {
 122         //if (fb__.is_open())
 123         //      lyxerr << "Error in LyXLex::setFile: "
 124         //              "file or stream already set." << endl;
 125         fb__.open(filename.c_str(), ios::in);
 126         //is.rdbuf(&fb__);
 127         name = filename;
 128         lineno = 0;
 129         return fb__.is_open() && is.good();
 130 }
 131
 132
 133 void LyXLex::Pimpl::setStream(istream & i)
 134 {
 135         if (fb__.is_open() || is.rdbuf()->in_avail())
 136                 lyxerr << "Error in LyXLex::setStream: "
 137                         "file or stream already set." << endl;
 138         is.rdbuf(i.rdbuf());
 139         lineno = 0;
 140 }
 141
 142
 143 bool LyXLex::Pimpl::next(bool esc /* = false */)
 144 {
 145         if (!pushTok.empty()) {
 146                 pushTok.copy(buff, string::npos);
 147                 buff[pushTok.length()] = '\0';
 148                 pushTok.erase();
 149                 return true;
 150         }
 151         if (!esc) {
 152                 unsigned char c = 0; // getc() returns an int
 153                 char cc = 0;
 154                 status = 0;
 155                 while (is && !status) {
 156                         is.get(cc);
 157                         c = cc;
 158                         if (c == '#') {
 159                                 // Read rest of line (fast :-)
 160                                 is.getline(buff, sizeof(buff));
 161                                 lyxerr[Debug::LYXLEX] << "Comment read: `" << c
 162                                                       << buff << "'" << endl;
 163                                 ++lineno;
 164                                 continue;
 165                         }
 166
 167                         if (c == '\"') {
 168                                 int i = -1;
 169                                 do {
 170                                         is.get(cc);
 171                                         c = cc;
 172                                         if (c != '\r')
 173                                                 buff[++i] = c;
 174                                 } while (c != '\"' && c != '\n' && is &&
 175                                          i != (LEX_MAX_BUFF - 2));
 176
 177                                 if (i == (LEX_MAX_BUFF - 2)) {
 178                                         printError("Line too long");
 179                                         c = '\"'; // Pretend we got a "
 180                                         ++i;
 181                                 }
 182
 183                                 if (c != '\"') {
 184                                         printError("Missing quote");
 185                                         if (c == '\n')
 186                                                 ++lineno;
 187                                 }
 188
 189                                 buff[i] = '\0';
 190                                 status = LEX_DATA;
 191                                 break;
 192                         }
 193
 194                         if (c == ',')
 195                                 continue;              /* Skip ','s */
 196
 197                                 // using relational operators with chars other
 198                                 // than == and != is not safe. And if it is done
 199                                 // the type _have_ to be unsigned. It usually a
 200                                 // lot better to use the functions from cctype
 201                         if (c > ' ' && is)  {
 202                                 int i = 0;
 203                                 do {
 204                                         buff[i++] = c;
 205                                         is.get(cc);
 206                                         c = cc;
 207                                 } while (c > ' ' && c != ',' && is
 208                                          && (i != LEX_MAX_BUFF - 1) );
 209                                 if (i == LEX_MAX_BUFF - 1) {
 210                                         printError("Line too long");
 211                                 }
 212                                 buff[i] = '\0';
 213                                 status = LEX_TOKEN;
 214                         }
 215
 216                         if (c == '\r' && is) {
 217                                 // The Windows support has lead to the
 218                                 // possibility of "\r\n" at the end of
 219                                 // a line.  This will stop LyX choking
 220                                 // when it expected to find a '\n'
 221                                 is.get(cc);
 222                                 c = cc;
 223                         }
 224
 225                         if (c == '\n')
 226                                 ++lineno;
 227
 228                 }
 229                 if (status) return true;
 230
 231                 status = is.eof() ? LEX_FEOF: LEX_UNDEF;
 232                 buff[0] = '\0';
 233                 return false;
 234         } else {
 235                 unsigned char c = 0; // getc() returns an int
 236                 char cc = 0;
 237
 238                 status = 0;
 239                 while (is && !status) {
 240                         is.get(cc);
 241                         c = cc;
 242
 243                         // skip ','s
 244                         if (c == ',') continue;
 245
 246                         if (c == '\\') {
 247                                 // escape
 248                                 int i = 0;
 249                                 do {
 250                                         if (c == '\\') {
 251                                                 // escape the next char
 252                                                 is.get(cc);
 253                                                 c = cc;
 254                                         }
 255                                         buff[i++] = c;
 256                                         is.get(cc);
 257                                         c = cc;
 258                                 } while (c > ' ' && c != ',' && is
 259                                          && (i != LEX_MAX_BUFF - 1) );
 260                                 if (i == LEX_MAX_BUFF - 1) {
 261                                         printError("Line too long");
 262                                 }
 263                                 buff[i] = '\0';
 264                                 status = LEX_TOKEN;
 265                                 continue;
 266                         }
 267
 268                         if (c == '#') {
 269                                 // Read rest of line (fast :-)
 270                                 is.getline(buff, sizeof(buff));
 271                                 lyxerr[Debug::LYXLEX] << "Comment read: `" << c
 272                                                       << buff << "'" << endl;
 273                                 ++lineno;
 274                                 continue;
 275                         }
 276
 277                         // string
 278                         if (c == '\"') {
 279                                 int i = -1;
 280                                 bool escaped = false;
 281                                 do {
 282                                         escaped = false;
 283                                         is.get(cc);
 284                                         c = cc;
 285                                         if (c == '\r') continue;
 286                                         if (c == '\\') {
 287                                                 // escape the next char
 288                                                 is.get(cc);
 289                                                 c = cc;
 290                                                 escaped = true;
 291                                         }
 292                                         buff[++i] = c;
 293
 294                                         if (!escaped && c == '\"') break;
 295                                 } while (c != '\n' && is &&
 296                                          i != (LEX_MAX_BUFF - 2));
 297
 298                                 if (i == (LEX_MAX_BUFF - 2)) {
 299                                         printError("Line too long");
 300                                         c = '\"'; // Pretend we got a "
 301                                         ++i;
 302                                 }
 303
 304                                 if (c != '\"') {
 305                                         printError("Missing quote");
 306                                         if (c == '\n')
 307                                                 ++lineno;
 308                                 }
 309
 310                                 buff[i] = '\0';
 311                                 status = LEX_DATA;
 312                                 break;
 313                         }
 314
 315                         if (c > ' ' && is) {
 316                                 int i = 0;
 317                                 do {
 318                                         if (c == '\\') {
 319                                                 // escape the next char
 320                                                 is.get(cc);
 321                                                 c = cc;
 322                                                 //escaped = true;
 323                                         }
 324                                         buff[i++] = c;
 325                                         is.get(cc);
 326                                         c = cc;
 327                                 } while (c > ' ' && c != ',' && is
 328                                          && (i != LEX_MAX_BUFF-1) );
 329                                 if (i == LEX_MAX_BUFF-1) {
 330                                         printError("Line too long");
 331                                 }
 332                                 buff[i] = '\0';
 333                                 status = LEX_TOKEN;
 334                         }
 335                         // new line
 336                         if (c == '\n')
 337                                 ++lineno;
 338                 }
 339
 340                 if (status) return true;
 341
 342                 status = is.eof() ? LEX_FEOF : LEX_UNDEF;
 343                 buff[0] = '\0';
 344                 return false;
 345         }
 346 }
 347
 348         ///
 349 int LyXLex::Pimpl::search_kw(char const * const tag) const
 350 {
 351         keyword_item * res =
 352                 lower_bound(table, table + no_items,
 353                             tag, compare_tags());
 354         if (res != table + no_items
 355             && !compare_no_case(res->tag, tag))
 356                 return res->code;
 357         return LEX_UNDEF;
 358 }
 359
 360
 361 int LyXLex::Pimpl::lex()
 362 {
 363         //NOTE: possible bug.
 364         if (next() && status == LEX_TOKEN)
 365                 return search_kw(buff);
 366         else
 367                 return status;
 368 }
 369
 370
 371 bool LyXLex::Pimpl::EatLine()
 372 {
 373         int i = 0;
 374         unsigned char c = '\0';
 375         char cc = 0;
 376         while(is && c != '\n' && i != (LEX_MAX_BUFF - 1)) {
 377                 is.get(cc);
 378                 c = cc;
 379                 lyxerr[Debug::LYXLEX] << "LyXLex::EatLine read char: `"
 380                                       << c << "'" << endl;
 381                 if (c != '\r')
 382                         buff[i++] = c;
 383         }
 384         if (i == (LEX_MAX_BUFF - 1) && c != '\n') {
 385                 printError("Line too long");
 386                 c = '\n'; // Pretend we had an end of line
 387                 --lineno; // but don't increase line counter (netto effect)
 388                 ++i; // and preserve last character read.
 389         }
 390         if (c == '\n') {
 391                 ++lineno;
 392                 buff[--i] = '\0'; // i can never be 0 here, so no danger
 393                 status = LEX_DATA;
 394                 return true;
 395         } else {
 396                 buff[i] = '\0';
 397                 return false;
 398         }
 399 }
 400
 401
 402 bool LyXLex::Pimpl::nextToken()
 403 {
 404         if (!pushTok.empty()) {
 405                 pushTok.copy(buff, string::npos);
 406                 buff[pushTok.length()] = '\0';
 407                 pushTok.erase();
 408                 return true;
 409         }
 410
 411         status = 0;
 412         while (is && !status) {
 413                 unsigned char c = 0;
 414                 char cc = 0;
 415                 is.get(cc);
 416                 c = cc;
 417                 if (c >= ' ' && is) {
 418                         int i = 0;
 419                         if (c == '\\') { // first char == '\\'
 420                                 do {
 421                                         buff[i++] = c;
 422                                         is.get(cc);
 423                                         c = cc;
 424                                 } while (c > ' ' && c != '\\' && is
 425                                          && i != (LEX_MAX_BUFF-1));
 426                         } else {
 427                                 do {
 428                                         buff[i++] = c;
 429                                         is.get(cc);
 430                                         c = cc;
 431                                 } while (c >= ' ' && c != '\\' && is
 432                                          && i != (LEX_MAX_BUFF-1));
 433                         }
 434
 435                         if (i == (LEX_MAX_BUFF - 1)) {
 436                                 printError("Line too long");
 437                         }
 438
 439                         if (c == '\\') is.putback(c); // put it back
 440                         buff[i] = '\0';
 441                         status = LEX_TOKEN;
 442                 }
 443
 444                 if (c == '\n')
 445                         ++lineno;
 446
 447         }
 448         if (status)  return true;
 449
 450         status = is.eof() ? LEX_FEOF: LEX_UNDEF;
 451         buff[0] = '\0';
 452         return false;
 453 }
 454
 455
 456 void LyXLex::Pimpl::pushToken(string const & pt)
 457 {
 458         pushTok = pt;
 459 }