src/lyxlex_pimpl.C

   1 /**
   2  * \file lyxlex_pimpl.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars Gullik Bjønnes
   7  * \author Jean-Marc Lasgouttes
   8  * \author Jürgen Vigna
   9  *
  10  * Full author contact details are available in file CREDITS.
  11  */
  12
  13 #include <config.h>
  14
  15 #include "lyxlex_pimpl.h"
  16
  17 #include "debug.h"
  18
  19 #include "support/filetools.h"
  20 #include "support/lyxalgo.h"
  21 #include "support/lstrings.h"
  22 #include "support/types.h"
  23 #include "support/unicode.h"
  24
  25 #include <functional>
  26
  27
  28 namespace lyx {
  29
  30 using support::compare_ascii_no_case;
  31 using support::getFormatFromContents;
  32 using support::makeDisplayPath;
  33 using support::split;
  34 using support::subst;
  35
  36 using std::endl;
  37 using std::getline;
  38 using std::lower_bound;
  39 using std::sort;
  40 using std::string;
  41 using std::ios;
  42 using std::istream;
  43 using std::ostream;
  44
  45 namespace {
  46
  47 class compare_tags
  48         : public std::binary_function<keyword_item, keyword_item, bool> {
  49 public:
  50         // used by lower_bound, sort and sorted
  51         bool operator()(keyword_item const & a, keyword_item const & b) const
  52         {
  53                 // we use the ascii version, because in turkish, 'i'
  54                 // is not the lowercase version of 'I', and thus
  55                 // turkish locale breaks parsing of tags.
  56                 return compare_ascii_no_case(a.tag, b.tag) < 0;
  57         }
  58 };
  59
  60 } // end of anon namespace
  61
  62
  63 LyXLex::Pimpl::Pimpl(keyword_item * tab, int num)
  64         : is(&fb_), table(tab), no_items(num),
  65           status(0), lineno(0), commentChar('#')
  66 {
  67         verifyTable();
  68 }
  69
  70
  71 string const LyXLex::Pimpl::getString() const
  72 {
  73         return buff;
  74 }
  75
  76
  77 docstring const LyXLex::Pimpl::getDocString() const
  78 {
  79         return from_utf8(buff);
  80 }
  81
  82
  83 void LyXLex::Pimpl::printError(string const & message) const
  84 {
  85         string const tmpmsg = subst(message, "$$Token", getString());
  86         lyxerr << "LyX: " << tmpmsg << " [around line " << lineno
  87                 << " of file " << to_utf8(makeDisplayPath(name)) << ']' << endl;
  88 }
  89
  90
  91 void LyXLex::Pimpl::printTable(ostream & os)
  92 {
  93         os << "\nNumber of tags: " << no_items << endl;
  94         for (int i= 0; i < no_items; ++i)
  95                 os << "table[" << i
  96                    << "]:  tag: `" << table[i].tag
  97                    << "'  code:" << table[i].code << '\n';
  98         os.flush();
  99 }
 100
 101
 102 void LyXLex::Pimpl::verifyTable()
 103 {
 104         // Check if the table is sorted and if not, sort it.
 105         if (table
 106             && !lyx::sorted(table, table + no_items, compare_tags())) {
 107                 lyxerr << "The table passed to LyXLex is not sorted!\n"
 108                        << "Tell the developers to fix it!" << endl;
 109                 // We sort it anyway to avoid problems.
 110                 lyxerr << "\nUnsorted:" << endl;
 111                 printTable(lyxerr);
 112
 113                 sort(table, table + no_items, compare_tags());
 114                 lyxerr << "\nSorted:" << endl;
 115                 printTable(lyxerr);
 116         }
 117 }
 118
 119
 120 void LyXLex::Pimpl::pushTable(keyword_item * tab, int num)
 121 {
 122         pushed_table tmppu(table, no_items);
 123         pushed.push(tmppu);
 124
 125         table = tab;
 126         no_items = num;
 127
 128         verifyTable();
 129 }
 130
 131
 132 void LyXLex::Pimpl::popTable()
 133 {
 134         if (pushed.empty()) {
 135                 lyxerr << "LyXLex error: nothing to pop!" << endl;
 136                 return;
 137         }
 138
 139         pushed_table tmp = pushed.top();
 140         pushed.pop();
 141         table = tmp.table_elem;
 142         no_items = tmp.table_siz;
 143 }
 144
 145
 146 bool LyXLex::Pimpl::setFile(string const & filename)
 147 {
 148         // Check the format of the file.
 149         string const format = getFormatFromContents(filename);
 150
 151         if (format == "gzip" || format == "zip" || format == "compress") {
 152                 lyxerr[Debug::LYXLEX] << "lyxlex: compressed" << endl;
 153
 154                 // The check only outputs a debug message, because it triggers
 155                 // a bug in compaq cxx 6.2, where is_open() returns 'true' for
 156                 // a fresh new filebuf.  (JMarc)
 157                 if (!gz_.empty() || istream::off_type(is.tellg()) > -1)
 158                         lyxerr[Debug::LYXLEX] << "Error in LyXLex::setFile: "
 159                                 "file or stream already set." << endl;
 160                 gz_.push(io::gzip_decompressor());
 161                 gz_.push(io::file_source(filename));
 162                 is.rdbuf(&gz_);
 163                 name = filename;
 164                 lineno = 0;
 165                 return gz_.component<io::file_source>(1)->is_open() && is.good();
 166         } else {
 167                 lyxerr[Debug::LYXLEX] << "lyxlex: UNcompressed" << endl;
 168
 169                 // The check only outputs a debug message, because it triggers
 170                 // a bug in compaq cxx 6.2, where is_open() returns 'true' for
 171                 // a fresh new filebuf.  (JMarc)
 172                 if (fb_.is_open() || istream::off_type(is.tellg()) > 0)
 173                         lyxerr[Debug::LYXLEX] << "Error in LyXLex::setFile: "
 174                                 "file or stream already set." << endl;
 175                 fb_.open(filename.c_str(), ios::in);
 176                 is.rdbuf(&fb_);
 177                 name = filename;
 178                 lineno = 0;
 179                 return fb_.is_open() && is.good();
 180         }
 181 }
 182
 183
 184 void LyXLex::Pimpl::setStream(istream & i)
 185 {
 186         if (fb_.is_open() || istream::off_type(is.tellg()) > 0)
 187                 lyxerr[Debug::LYXLEX]  << "Error in LyXLex::setStream: "
 188                         "file or stream already set." << endl;
 189         is.rdbuf(i.rdbuf());
 190         lineno = 0;
 191 }
 192
 193
 194 void LyXLex::Pimpl::setCommentChar(char c)
 195 {
 196         commentChar = c;
 197 }
 198
 199
 200 bool LyXLex::Pimpl::next(bool esc /* = false */)
 201 {
 202         if (!pushTok.empty()) {
 203                 // There can have been a whole line pushed so
 204                 // we extract the first word and leaves the rest
 205                 // in pushTok. (Lgb)
 206                 if (pushTok.find(' ') != string::npos && pushTok[0] == '\\') {
 207                         buff.clear();
 208                         pushTok = split(pushTok, buff, ' ');
 209                         return true;
 210                 } else {
 211                         buff = pushTok;
 212                         pushTok.clear();
 213                         return true;
 214                 }
 215         }
 216         if (!esc) {
 217                 unsigned char c = 0; // getc() returns an int
 218                 char cc = 0;
 219                 status = 0;
 220                 while (is && !status) {
 221                         is.get(cc);
 222                         c = cc;
 223                         if (c == commentChar) {
 224                                 // Read rest of line (fast :-)
 225 #if 1
 226                                 // That is not fast... (Lgb)
 227                                 string dummy;
 228                                 getline(is, dummy);
 229
 230                                 lyxerr[Debug::LYXLEX] << "Comment read: `" << c
 231                                                       << dummy << '\'' << endl;
 232 #else
 233                                 // unfortunately ignore is buggy (Lgb)
 234                                 is.ignore(100, '\n');
 235 #endif
 236                                 ++lineno;
 237                                 continue;
 238                         }
 239
 240                         if (c == '\"') {
 241                                 buff.clear();
 242
 243                                 do {
 244                                         is.get(cc);
 245                                         c = cc;
 246                                         if (c != '\r')
 247                                                 buff.push_back(c);
 248                                 } while (c != '\"' && c != '\n' && is);
 249
 250                                 if (c != '\"') {
 251                                         printError("Missing quote");
 252                                         if (c == '\n')
 253                                                 ++lineno;
 254                                 }
 255
 256                                 buff.resize(buff.size()-1);
 257                                 status = LEX_DATA;
 258                                 break;
 259                         }
 260
 261                         if (c == ',')
 262                                 continue;              /* Skip ','s */
 263
 264                                 // using relational operators with chars other
 265                                 // than == and != is not safe. And if it is done
 266                                 // the type _have_ to be unsigned. It usually a
 267                                 // lot better to use the functions from cctype
 268                         if (c > ' ' && is)  {
 269                                 buff.clear();
 270
 271                                 do {
 272                                         buff.push_back(c);
 273                                         is.get(cc);
 274                                         c = cc;
 275                                 } while (c > ' ' && c != ',' && is);
 276
 277                                 status = LEX_TOKEN;
 278                         }
 279
 280                         if (c == '\r' && is) {
 281                                 // The Windows support has lead to the
 282                                 // possibility of "\r\n" at the end of
 283                                 // a line.  This will stop LyX choking
 284                                 // when it expected to find a '\n'
 285                                 is.get(cc);
 286                                 c = cc;
 287                         }
 288
 289                         if (c == '\n')
 290                                 ++lineno;
 291
 292                 }
 293                 if (status) return true;
 294
 295                 status = is.eof() ? LEX_FEOF: LEX_UNDEF;
 296                 buff.clear();
 297                 return false;
 298         } else {
 299                 unsigned char c = 0; // getc() returns an int
 300                 char cc = 0;
 301
 302                 status = 0;
 303                 while (is && !status) {
 304                         is.get(cc);
 305                         c = cc;
 306
 307                         // skip ','s
 308                         if (c == ',') continue;
 309
 310                         if (c == '\\') {
 311                                 // escape
 312                                 buff.clear();
 313
 314                                 do {
 315                                         if (c == '\\') {
 316                                                 // escape the next char
 317                                                 is.get(cc);
 318                                                 c = cc;
 319                                         }
 320                                         buff.push_back(c);
 321                                         is.get(cc);
 322                                         c = cc;
 323                                 } while (c > ' ' && c != ',' && is);
 324
 325                                 status = LEX_TOKEN;
 326                                 continue;
 327                         }
 328
 329                         if (c == commentChar) {
 330                                 // Read rest of line (fast :-)
 331 #if 1
 332                                 // That is still not fast... (Lgb)
 333                                 string dummy;
 334                                 getline(is, dummy);
 335
 336                                 lyxerr[Debug::LYXLEX] << "Comment read: `" << c
 337                                                       << dummy << '\'' << endl;
 338 #else
 339                                 // but ignore is also still buggy (Lgb)
 340                                 // This is fast (Lgb)
 341                                 is.ignore(100, '\n');
 342 #endif
 343                                 ++lineno;
 344                                 continue;
 345                         }
 346
 347                         // string
 348                         if (c == '\"') {
 349                                 buff.clear();
 350
 351                                 bool escaped = false;
 352                                 do {
 353                                         escaped = false;
 354                                         is.get(cc);
 355                                         c = cc;
 356                                         if (c == '\r') continue;
 357                                         if (c == '\\') {
 358                                                 // escape the next char
 359                                                 is.get(cc);
 360                                                 c = cc;
 361                                                 if (c == '\"' || c == '\\')
 362                                                         escaped = true;
 363                                                 else
 364                                                         buff.push_back('\\');
 365                                         }
 366                                         buff.push_back(c);
 367
 368                                         if (!escaped && c == '\"') break;
 369                                 } while (c != '\n' && is);
 370
 371                                 if (c != '\"') {
 372                                         printError("Missing quote");
 373                                         if (c == '\n')
 374                                                 ++lineno;
 375                                 }
 376
 377                                 buff.resize(buff.size() -1);
 378                                 status = LEX_DATA;
 379                                 break;
 380                         }
 381
 382                         if (c > ' ' && is) {
 383                                 buff.clear();
 384
 385                                 do {
 386                                         if (c == '\\') {
 387                                                 // escape the next char
 388                                                 is.get(cc);
 389                                                 c = cc;
 390                                                 //escaped = true;
 391                                         }
 392                                         buff.push_back(c);
 393                                         is.get(cc);
 394                                         c = cc;
 395                                 } while (c > ' ' && c != ',' && is);
 396
 397                                 status = LEX_TOKEN;
 398                         }
 399                         // new line
 400                         if (c == '\n')
 401                                 ++lineno;
 402                 }
 403
 404                 if (status) return true;
 405
 406                 status = is.eof() ? LEX_FEOF : LEX_UNDEF;
 407                 buff.clear();
 408                 return false;
 409         }
 410 }
 411
 412
 413 int LyXLex::Pimpl::search_kw(char const * const tag) const
 414 {
 415         keyword_item search_tag = { tag, 0 };
 416         keyword_item * res =
 417                 lower_bound(table, table + no_items,
 418                             search_tag, compare_tags());
 419         // use the compare_ascii_no_case instead of compare_no_case,
 420         // because in turkish, 'i' is not the lowercase version of 'I',
 421         // and thus turkish locale breaks parsing of tags.
 422         if (res != table + no_items
 423             && !compare_ascii_no_case(res->tag, tag))
 424                 return res->code;
 425         return LEX_UNDEF;
 426 }
 427
 428
 429 int LyXLex::Pimpl::lex()
 430 {
 431         //NOTE: possible bug.
 432         if (next() && status == LEX_TOKEN) {
 433                 return search_kw(getString().c_str());
 434         } else
 435                 return status;
 436 }
 437
 438
 439 bool LyXLex::Pimpl::eatLine()
 440 {
 441         buff.clear();
 442
 443         unsigned char c = '\0';
 444         char cc = 0;
 445         while (is && c != '\n') {
 446                 is.get(cc);
 447                 c = cc;
 448                 //lyxerr[Debug::LYXLEX] << "LyXLex::EatLine read char: `"
 449                 //                    << c << '\'' << endl;
 450                 if (c != '\r')
 451                         buff.push_back(c);
 452         }
 453
 454         if (c == '\n') {
 455                 ++lineno;
 456                 buff.resize(buff.size() - 1);
 457                 status = LEX_DATA;
 458                 return true;
 459         } else {
 460                 return false;
 461         }
 462 }
 463
 464
 465 bool LyXLex::Pimpl::nextToken()
 466 {
 467         if (!pushTok.empty()) {
 468                 // There can have been a whole line pushed so
 469                 // we extract the first word and leaves the rest
 470                 // in pushTok. (Lgb)
 471                 if (pushTok.find(' ') != string::npos && pushTok[0] == '\\') {
 472                         buff.clear();
 473                         pushTok = split(pushTok, buff, ' ');
 474                         return true;
 475                 } else {
 476                         buff = pushTok;
 477                         pushTok.clear();
 478                         return true;
 479                 }
 480         }
 481
 482         status = 0;
 483         while (is && !status) {
 484                 unsigned char c = 0;
 485                 char cc = 0;
 486                 is.get(cc);
 487                 c = cc;
 488                 if (c >= ' ' && is) {
 489                         buff.clear();
 490
 491                         if (c == '\\') { // first char == '\\'
 492                                 do {
 493                                         buff.push_back(c);
 494                                         is.get(cc);
 495                                         c = cc;
 496                                 } while (c > ' ' && c != '\\' && is);
 497                         } else {
 498                                 do {
 499                                         buff.push_back(c);
 500                                         is.get(cc);
 501                                         c = cc;
 502                                 } while (c >= ' ' && c != '\\' && is);
 503                         }
 504
 505                         if (c == '\\') is.putback(c); // put it back
 506                         status = LEX_TOKEN;
 507                 }
 508
 509                 if (c == '\n')
 510                         ++lineno;
 511
 512         }
 513         if (status)  return true;
 514
 515         status = is.eof() ? LEX_FEOF: LEX_UNDEF;
 516         buff.clear();
 517         return false;
 518 }
 519
 520
 521 void LyXLex::Pimpl::pushToken(string const & pt)
 522 {
 523         pushTok = pt;
 524 }
 525
 526
 527 } // namespace lyx