src/insets/InsetBibtex.cpp

   1 /**
   2  * \file InsetBibtex.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Alejandro Aguilar Sierra
   7  * \author Richard Heck (BibTeX parser improvements)
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "InsetBibtex.h"
  15
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "DispatchResult.h"
  19 #include "support/debug.h"
  20 #include "Encoding.h"
  21 #include "FuncRequest.h"
  22 #include "support/gettext.h"
  23 #include "LaTeXFeatures.h"
  24 #include "MetricsInfo.h"
  25 #include "OutputParams.h"
  26 #include "TextClass.h"
  27
  28 #include "frontends/alert.h"
  29
  30 #include "support/ExceptionMessage.h"
  31 #include "support/docstream.h"
  32 #include "support/FileNameList.h"
  33 #include "support/filetools.h"
  34 #include "support/lstrings.h"
  35 #include "support/lyxlib.h"
  36 #include "support/os.h"
  37 #include "support/Path.h"
  38 #include "support/textutils.h"
  39
  40 #include <boost/tokenizer.hpp>
  41
  42 using namespace std;
  43 using namespace lyx::support;
  44
  45 namespace lyx {
  46
  47 namespace Alert = frontend::Alert;
  48 namespace os = support::os;
  49
  50
  51 InsetBibtex::InsetBibtex(InsetCommandParams const & p)
  52         : InsetCommand(p, "bibtex")
  53 {}
  54
  55
  56 CommandInfo const * InsetBibtex::findInfo(string const & /* cmdName */)
  57 {
  58         static const char * const paramnames[] =
  59                 {"options", "btprint", "bibfiles", ""};
  60         static const bool isoptional[] = {true, true, false};
  61         static const CommandInfo info = {3, paramnames, isoptional};
  62         return &info;
  63 }
  64
  65
  66 Inset * InsetBibtex::clone() const
  67 {
  68         return new InsetBibtex(*this);
  69 }
  70
  71
  72 void InsetBibtex::doDispatch(Cursor & cur, FuncRequest & cmd)
  73 {
  74         switch (cmd.action) {
  75
  76         case LFUN_INSET_MODIFY: {
  77                 InsetCommandParams p(BIBTEX_CODE);
  78                 try {
  79                         if (!InsetCommandMailer::string2params("bibtex",
  80                                         to_utf8(cmd.argument()), p)) {
  81                                 cur.noUpdate();
  82                                 break;
  83                         }
  84                 } catch (ExceptionMessage const & message) {
  85                         if (message.type_ == WarningException) {
  86                                 Alert::warning(message.title_, message.details_);
  87                                 cur.noUpdate();
  88                         } else
  89                                 throw message;
  90                         break;
  91                 }
  92                 setParams(p);
  93                 cur.buffer().updateBibfilesCache();
  94                 break;
  95         }
  96
  97         default:
  98                 InsetCommand::doDispatch(cur, cmd);
  99                 break;
 100         }
 101 }
 102
 103
 104 docstring const InsetBibtex::getScreenLabel(Buffer const &) const
 105 {
 106         return _("BibTeX Generated Bibliography");
 107 }
 108
 109
 110 namespace {
 111
 112 string normalizeName(Buffer const & buffer, OutputParams const & runparams,
 113                       string const & name, string const & ext)
 114 {
 115         string const fname = makeAbsPath(name, buffer.filePath()).absFilename();
 116         if (absolutePath(name) || !FileName(fname + ext).isReadableFile())
 117                 return name;
 118         if (!runparams.nice)
 119                 return fname;
 120
 121         // FIXME UNICODE
 122         return to_utf8(makeRelPath(from_utf8(fname),
 123                                          from_utf8(buffer.masterBuffer()->filePath())));
 124 }
 125
 126 }
 127
 128
 129 int InsetBibtex::latex(Buffer const & buffer, odocstream & os,
 130                        OutputParams const & runparams) const
 131 {
 132         // the sequence of the commands:
 133         // 1. \bibliographystyle{style}
 134         // 2. \addcontentsline{...} - if option bibtotoc set
 135         // 3. \bibliography{database}
 136         // and with bibtopic:
 137         // 1. \bibliographystyle{style}
 138         // 2. \begin{btSect}{database}
 139         // 3. \btPrint{Cited|NotCited|All}
 140         // 4. \end{btSect}
 141
 142         // Database(s)
 143         // If we are processing the LaTeX file in a temp directory then
 144         // copy the .bib databases to this temp directory, mangling their
 145         // names in the process. Store this mangled name in the list of
 146         // all databases.
 147         // (We need to do all this because BibTeX *really*, *really*
 148         // can't handle "files with spaces" and Windows users tend to
 149         // use such filenames.)
 150         // Otherwise, store the (maybe absolute) path to the original,
 151         // unmangled database name.
 152         typedef boost::char_separator<char_type> Separator;
 153         typedef boost::tokenizer<Separator, docstring::const_iterator, docstring> Tokenizer;
 154
 155         Separator const separator(from_ascii(",").c_str());
 156         // The tokenizer must not be called with temporary strings, since
 157         // it does not make a copy and uses iterators of the string further
 158         // down. getParam returns a reference, so this is OK.
 159         Tokenizer const tokens(getParam("bibfiles"), separator);
 160         Tokenizer::const_iterator const begin = tokens.begin();
 161         Tokenizer::const_iterator const end = tokens.end();
 162
 163         odocstringstream dbs;
 164         for (Tokenizer::const_iterator it = begin; it != end; ++it) {
 165                 docstring const input = trim(*it);
 166                 // FIXME UNICODE
 167                 string utf8input = to_utf8(input);
 168                 string database =
 169                         normalizeName(buffer, runparams, utf8input, ".bib");
 170                 FileName const try_in_file(makeAbsPath(database + ".bib", buffer.filePath()));
 171                 bool const not_from_texmf = try_in_file.isReadableFile();
 172
 173                 if (!runparams.inComment && !runparams.dryrun && !runparams.nice &&
 174                     not_from_texmf) {
 175
 176                         // mangledFilename() needs the extension
 177                         DocFileName const in_file = DocFileName(try_in_file);
 178                         database = removeExtension(in_file.mangledFilename());
 179                         FileName const out_file = makeAbsPath(database + ".bib",
 180                                         buffer.masterBuffer()->temppath());
 181
 182                         bool const success = in_file.copyTo(out_file);
 183                         if (!success) {
 184                                 lyxerr << "Failed to copy '" << in_file
 185                                        << "' to '" << out_file << "'"
 186                                        << endl;
 187                         }
 188                 } else if (!runparams.inComment && runparams.nice && not_from_texmf &&
 189                            !isValidLaTeXFilename(database)) {
 190                                 frontend::Alert::warning(_("Invalid filename"),
 191                                                          _("The following filename is likely to cause trouble "
 192                                                            "when running the exported file through LaTeX: ") +
 193                                                             from_utf8(database));
 194                 }
 195
 196                 if (it != begin)
 197                         dbs << ',';
 198                 // FIXME UNICODE
 199                 dbs << from_utf8(latex_path(database));
 200         }
 201         docstring const db_out = dbs.str();
 202
 203         // Post this warning only once.
 204         static bool warned_about_spaces = false;
 205         if (!warned_about_spaces &&
 206             runparams.nice && db_out.find(' ') != docstring::npos) {
 207                 warned_about_spaces = true;
 208
 209                 Alert::warning(_("Export Warning!"),
 210                                _("There are spaces in the paths to your BibTeX databases.\n"
 211                                               "BibTeX will be unable to find them."));
 212         }
 213
 214         // Style-Options
 215         string style = to_utf8(getParam("options")); // maybe empty! and with bibtotoc
 216         string bibtotoc;
 217         if (prefixIs(style, "bibtotoc")) {
 218                 bibtotoc = "bibtotoc";
 219                 if (contains(style, ','))
 220                         style = split(style, bibtotoc, ',');
 221         }
 222
 223         // line count
 224         int nlines = 0;
 225
 226         if (!style.empty()) {
 227                 string base = normalizeName(buffer, runparams, style, ".bst");
 228                 FileName const try_in_file(makeAbsPath(base + ".bst", buffer.filePath()));
 229                 bool const not_from_texmf = try_in_file.isReadableFile();
 230                 // If this style does not come from texmf and we are not
 231                 // exporting to .tex copy it to the tmp directory.
 232                 // This prevents problems with spaces and 8bit charcaters
 233                 // in the file name.
 234                 if (!runparams.inComment && !runparams.dryrun && !runparams.nice &&
 235                     not_from_texmf) {
 236                         // use new style name
 237                         DocFileName const in_file = DocFileName(try_in_file);
 238                         base = removeExtension(in_file.mangledFilename());
 239                         FileName const out_file(makeAbsPath(base + ".bst",
 240                                         buffer.masterBuffer()->temppath()));
 241                         bool const success = in_file.copyTo(out_file);
 242                         if (!success) {
 243                                 lyxerr << "Failed to copy '" << in_file
 244                                        << "' to '" << out_file << "'"
 245                                        << endl;
 246                         }
 247                 }
 248                 // FIXME UNICODE
 249                 os << "\\bibliographystyle{"
 250                    << from_utf8(latex_path(normalizeName(buffer, runparams, base, ".bst")))
 251                    << "}\n";
 252                 nlines += 1;
 253         }
 254
 255         // Post this warning only once.
 256         static bool warned_about_bst_spaces = false;
 257         if (!warned_about_bst_spaces && runparams.nice && contains(style, ' ')) {
 258                 warned_about_bst_spaces = true;
 259                 Alert::warning(_("Export Warning!"),
 260                                _("There are spaces in the path to your BibTeX style file.\n"
 261                                               "BibTeX will be unable to find it."));
 262         }
 263
 264         if (!db_out.empty() && buffer.params().use_bibtopic){
 265                 os << "\\begin{btSect}{" << db_out << "}\n";
 266                 docstring btprint = getParam("btprint");
 267                 if (btprint.empty())
 268                         // default
 269                         btprint = from_ascii("btPrintCited");
 270                 os << "\\" << btprint << "\n"
 271                    << "\\end{btSect}\n";
 272                 nlines += 3;
 273         }
 274
 275         // bibtotoc-Option
 276         if (!bibtotoc.empty() && !buffer.params().use_bibtopic) {
 277                 // maybe a problem when a textclass has no "art" as
 278                 // part of its name, because it's than book.
 279                 // For the "official" lyx-layouts it's no problem to support
 280                 // all well
 281                 if (!contains(buffer.params().getTextClass().name(),
 282                               "art")) {
 283                         if (buffer.params().sides == OneSide) {
 284                                 // oneside
 285                                 os << "\\clearpage";
 286                         } else {
 287                                 // twoside
 288                                 os << "\\cleardoublepage";
 289                         }
 290
 291                         // bookclass
 292                         os << "\\addcontentsline{toc}{chapter}{\\bibname}";
 293
 294                 } else {
 295                         // article class
 296                         os << "\\addcontentsline{toc}{section}{\\refname}";
 297                 }
 298         }
 299
 300         if (!db_out.empty() && !buffer.params().use_bibtopic){
 301                 os << "\\bibliography{" << db_out << "}\n";
 302                 nlines += 1;
 303         }
 304
 305         return nlines;
 306 }
 307
 308
 309 FileNameList const InsetBibtex::getFiles(Buffer const & buffer) const
 310 {
 311         FileName path(buffer.filePath());
 312         PathChanger p(path);
 313
 314         FileNameList vec;
 315
 316         string tmp;
 317         // FIXME UNICODE
 318         string bibfiles = to_utf8(getParam("bibfiles"));
 319         bibfiles = split(bibfiles, tmp, ',');
 320         while (!tmp.empty()) {
 321                 FileName const file = findtexfile(changeExtension(tmp, "bib"), "bib");
 322                 LYXERR(Debug::LATEX, "Bibfile: " << file);
 323
 324                 // If we didn't find a matching file name just fail silently
 325                 if (!file.empty())
 326                         vec.push_back(file);
 327
 328                 // Get next file name
 329                 bibfiles = split(bibfiles, tmp, ',');
 330         }
 331
 332         return vec;
 333 }
 334
 335 namespace {
 336
 337         // methods for parsing bibtex files
 338
 339         typedef map<docstring, docstring> VarMap;
 340
 341         /// remove whitespace characters, optionally a single comma,
 342         /// and further whitespace characters from the stream.
 343         /// @return true if a comma was found, false otherwise
 344         ///
 345         bool removeWSAndComma(idocfstream & ifs) {
 346                 char_type ch;
 347
 348                 if (!ifs)
 349                         return false;
 350
 351                 // skip whitespace
 352                 do {
 353                         ifs.get(ch);
 354                 } while (ifs && isSpace(ch));
 355
 356                 if (!ifs)
 357                         return false;
 358
 359                 if (ch != ',') {
 360                         ifs.putback(ch);
 361                         return false;
 362                 }
 363
 364                 // skip whitespace
 365                 do {
 366                         ifs.get(ch);
 367                 } while (ifs && isSpace(ch));
 368
 369                 if (ifs) {
 370                         ifs.putback(ch);
 371                 }
 372
 373                 return true;
 374         }
 375
 376
 377         enum charCase {
 378                 makeLowerCase,
 379                 keepCase
 380         };
 381
 382         /// remove whitespace characters, read characer sequence
 383         /// not containing whitespace characters or characters in
 384         /// delimChars, and remove further whitespace characters.
 385         ///
 386         /// @return true if a string of length > 0 could be read.
 387         ///
 388         bool readTypeOrKey(docstring & val, idocfstream & ifs,
 389                 docstring const & delimChars, docstring const &illegalChars,
 390                 charCase chCase) {
 391
 392                 char_type ch;
 393
 394                 val.clear();
 395
 396                 if (!ifs)
 397                         return false;
 398
 399                 // skip whitespace
 400                 do {
 401                         ifs.get(ch);
 402                 } while (ifs && isSpace(ch));
 403
 404                 if (!ifs)
 405                         return false;
 406
 407                 // read value
 408                 bool legalChar = true;
 409                 while (ifs && !isSpace(ch) &&
 410                                                  delimChars.find(ch) == docstring::npos &&
 411                                                  (legalChar = (illegalChars.find(ch) == docstring::npos))
 412                                         )
 413                 {
 414                         if (chCase == makeLowerCase)
 415                                 val += lowercase(ch);
 416                         else
 417                                 val += ch;
 418                         ifs.get(ch);
 419                 }
 420
 421                 if (!legalChar) {
 422                         ifs.putback(ch);
 423                         return false;
 424                 }
 425
 426                 // skip whitespace
 427                 while (ifs && isSpace(ch)) {
 428                         ifs.get(ch);
 429                 }
 430
 431                 if (ifs) {
 432                         ifs.putback(ch);
 433                 }
 434
 435                 return val.length() > 0;
 436         }
 437
 438         /// read subsequent bibtex values that are delimited with a #-character.
 439         /// Concatenate all parts and replace names with the associated string in
 440         /// the variable strings.
 441         /// @return true if reading was successfull (all single parts were delimited
 442         /// correctly)
 443         bool readValue(docstring & val, idocfstream & ifs, const VarMap & strings) {
 444
 445                 char_type ch;
 446
 447                 val.clear();
 448
 449                 if (!ifs)
 450                         return false;
 451
 452                 do {
 453                         // skip whitespace
 454                         do {
 455                                 ifs.get(ch);
 456                         } while (ifs && isSpace(ch));
 457
 458                         if (!ifs)
 459                                 return false;
 460
 461                         // check for field type
 462                         if (isDigit(ch)) {
 463
 464                                 // read integer value
 465                                 do {
 466                                         val += ch;
 467                                         ifs.get(ch);
 468                                 } while (ifs && isDigit(ch));
 469
 470                                 if (!ifs)
 471                                         return false;
 472
 473                         } else if (ch == '"' || ch == '{') {
 474                                 // set end delimiter
 475                                 char_type delim = ch == '"' ? '"': '}';
 476
 477                                 //Skip whitespace
 478                                 do {
 479                                         ifs.get(ch);
 480                                 } while (ifs && isSpace(ch));
 481
 482                                 if (!ifs)
 483                                         return false;
 484
 485                                 //We now have the first non-whitespace character
 486                                 //We'll collapse adjacent whitespace.
 487                                 bool lastWasWhiteSpace = false;
 488
 489                                 // inside this delimited text braces must match.
 490                                 // Thus we can have a closing delimiter only
 491                                 // when nestLevel == 0
 492                                 int nestLevel = 0;
 493
 494                                 while (ifs && (nestLevel > 0 || ch != delim)) {
 495                                         if (isSpace(ch)) {
 496                                                 lastWasWhiteSpace = true;
 497                                                 ifs.get(ch);
 498                                                 continue;
 499                                         }
 500                                         //We output the space only after we stop getting
 501                                         //whitespace so as not to output any whitespace
 502                                         //at the end of the value.
 503                                         if (lastWasWhiteSpace) {
 504                                                 lastWasWhiteSpace = false;
 505                                                 val += ' ';
 506                                         }
 507
 508                                         val += ch;
 509
 510                                         // update nesting level
 511                                         switch (ch) {
 512                                                 case '{':
 513                                                         ++nestLevel;
 514                                                         break;
 515                                                 case '}':
 516                                                         --nestLevel;
 517                                                         if (nestLevel < 0) return false;
 518                                                         break;
 519                                         }
 520
 521                                         ifs.get(ch);
 522                                 }
 523
 524                                 if (!ifs)
 525                                         return false;
 526
 527                                 ifs.get(ch);
 528
 529                                 if (!ifs)
 530                                         return false;
 531
 532                         } else {
 533
 534                                 // reading a string name
 535                                 docstring strName;
 536
 537                                 while (ifs && !isSpace(ch) && ch != '#' && ch != ',' && ch != '}' && ch != ')') {
 538                                         strName += lowercase(ch);
 539                                         ifs.get(ch);
 540                                 }
 541
 542                                 if (!ifs)
 543                                         return false;
 544
 545                                 // replace the string with its assigned value or
 546                                 // discard it if it's not assigned
 547                                 if (strName.length()) {
 548                                         VarMap::const_iterator pos = strings.find(strName);
 549                                         if (pos != strings.end()) {
 550                                                 val += pos->second;
 551                                         }
 552                                 }
 553                         }
 554
 555                         // skip WS
 556                         while (ifs && isSpace(ch)) {
 557                                 ifs.get(ch);
 558                         }
 559
 560                         if (!ifs)
 561                                 return false;
 562
 563                         // continue reading next value on concatenate with '#'
 564                 } while (ch == '#');
 565
 566                 ifs.putback(ch);
 567
 568                 return true;
 569         }
 570 }
 571
 572
 573 // This method returns a comma separated list of Bibtex entries
 574 void InsetBibtex::fillWithBibKeys(Buffer const & buffer,
 575                 BiblioInfo & keylist, InsetIterator const & /*di*/) const
 576 {
 577         FileNameList const files = getFiles(buffer);
 578         for (vector<FileName>::const_iterator it = files.begin();
 579              it != files.end(); ++ it) {
 580                 // This bibtex parser is a first step to parse bibtex files
 581                 // more precisely.
 582                 //
 583                 // - it reads the whole bibtex entry and does a syntax check
 584                 //   (matching delimiters, missing commas,...
 585                 // - it recovers from errors starting with the next @-character
 586                 // - it reads @string definitions and replaces them in the
 587                 //   field values.
 588                 // - it accepts more characters in keys or value names than
 589                 //   bibtex does.
 590                 //
 591                 // Officially bibtex does only support ASCII, but in practice
 592                 // you can use the encoding of the main document as long as
 593                 // some elements like keys and names are pure ASCII. Therefore
 594                 // we convert the file from the buffer encoding.
 595                 // We don't restrict keys to ASCII in LyX, since our own
 596                 // InsetBibitem can generate non-ASCII keys, and nonstandard
 597                 // 8bit clean bibtex forks exist.
 598
 599                 idocfstream ifs(it->toFilesystemEncoding().c_str(),
 600                         ios_base::in,
 601                         buffer.params().encoding().iconvName());
 602
 603                 char_type ch;
 604                 VarMap strings;
 605
 606                 while (ifs) {
 607
 608                         ifs.get(ch);
 609                         if (!ifs)
 610                                 break;
 611
 612                         if (ch != '@')
 613                                 continue;
 614
 615                         docstring entryType;
 616
 617                         if (!readTypeOrKey(entryType, ifs, from_ascii("{("),
 618                                            docstring(), makeLowerCase) || !ifs)
 619                                 continue;
 620
 621                         if (entryType == from_ascii("comment")) {
 622
 623                                 ifs.ignore(numeric_limits<int>::max(), '\n');
 624                                 continue;
 625                         }
 626
 627                         ifs.get(ch);
 628                         if (!ifs)
 629                                 break;
 630
 631                         if ((ch != '(') && (ch != '{')) {
 632                                 // invalid entry delimiter
 633                                 ifs.putback(ch);
 634                                 continue;
 635                         }
 636
 637                         // process the entry
 638                         if (entryType == from_ascii("string")) {
 639
 640                                 // read string and add it to the strings map
 641                                 // (or replace it's old value)
 642                                 docstring name;
 643                                 docstring value;
 644
 645                                 if (!readTypeOrKey(name, ifs, from_ascii("="),
 646                                                    from_ascii("#{}(),"), makeLowerCase) || !ifs)
 647                                         continue;
 648
 649                                 // next char must be an equal sign
 650                                 ifs.get(ch);
 651                                 if (!ifs || ch != '=')
 652                                         continue;
 653
 654                                 if (!readValue(value, ifs, strings))
 655                                         continue;
 656
 657                                 strings[name] = value;
 658
 659                         } else if (entryType == from_ascii("preamble")) {
 660
 661                                 // preamble definitions are discarded.
 662                                 // can they be of any use in lyx?
 663                                 docstring value;
 664
 665                                 if (!readValue(value, ifs, strings))
 666                                         continue;
 667
 668                         } else {
 669
 670                                 // Citation entry. Try to read the key.
 671                                 docstring key;
 672
 673                                 if (!readTypeOrKey(key, ifs, from_ascii(","),
 674                                                    from_ascii("}"), keepCase) || !ifs)
 675                                         continue;
 676
 677                                 /////////////////////////////////////////////
 678                                 // now we have a key, so we will add an entry
 679                                 // (even if it's empty, as bibtex does)
 680                                 //
 681                                 // we now read the field = value pairs.
 682                                 // all items must be separated by a comma. If
 683                                 // it is missing the scanning of this entry is
 684                                 // stopped and the next is searched.
 685                                 docstring fields;
 686                                 docstring name;
 687                                 docstring value;
 688                                 docstring commaNewline;
 689                                 docstring data;
 690                                 BibTeXInfo keyvalmap;
 691                                 keyvalmap.entryType = entryType;
 692
 693                                 bool readNext = removeWSAndComma(ifs);
 694
 695                                 while (ifs && readNext) {
 696
 697                                         // read field name
 698                                         if (!readTypeOrKey(name, ifs, from_ascii("="),
 699                                                            from_ascii("{}(),"), makeLowerCase) || !ifs)
 700                                                 break;
 701
 702                                         // next char must be an equal sign
 703                                         ifs.get(ch);
 704                                         if (!ifs)
 705                                                 break;
 706                                         if (ch != '=') {
 707                                                 ifs.putback(ch);
 708                                                 break;
 709                                         }
 710
 711                                         // read field value
 712                                         if (!readValue(value, ifs, strings))
 713                                                 break;
 714
 715                                         keyvalmap[name] = value;
 716                                         data += "\n\n" + value;
 717                                         keylist.fieldNames.insert(name);
 718                                         readNext = removeWSAndComma(ifs);
 719                                 }
 720
 721                                 // add the new entry
 722                                 keylist.entryTypes.insert(entryType);
 723                                 keyvalmap.allData = data;
 724                                 keyvalmap.isBibTeX = true;
 725                                 keyvalmap.bibKey = key;
 726                                 keylist[key] = keyvalmap;
 727                         }
 728                 } //< searching '@'
 729         } //< for loop over files
 730 }
 731
 732
 733
 734 bool InsetBibtex::addDatabase(string const & db)
 735 {
 736         // FIXME UNICODE
 737         string bibfiles(to_utf8(getParam("bibfiles")));
 738         if (tokenPos(bibfiles, ',', db) == -1) {
 739                 if (!bibfiles.empty())
 740                         bibfiles += ',';
 741                 setParam("bibfiles", from_utf8(bibfiles + db));
 742                 return true;
 743         }
 744         return false;
 745 }
 746
 747
 748 bool InsetBibtex::delDatabase(string const & db)
 749 {
 750         // FIXME UNICODE
 751         string bibfiles(to_utf8(getParam("bibfiles")));
 752         if (contains(bibfiles, db)) {
 753                 int const n = tokenPos(bibfiles, ',', db);
 754                 string bd = db;
 755                 if (n > 0) {
 756                         // this is not the first database
 757                         string tmp = ',' + bd;
 758                         setParam("bibfiles", from_utf8(subst(bibfiles, tmp, string())));
 759                 } else if (n == 0)
 760                         // this is the first (or only) database
 761                         setParam("bibfiles", from_utf8(split(bibfiles, bd, ',')));
 762                 else
 763                         return false;
 764         }
 765         return true;
 766 }
 767
 768
 769 void InsetBibtex::validate(LaTeXFeatures & features) const
 770 {
 771         if (features.bufferParams().use_bibtopic)
 772                 features.require("bibtopic");
 773 }
 774
 775
 776 } // namespace lyx