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 "debug.h"
  20 #include "Encoding.h"
  21 #include "FuncRequest.h"
  22 #include "gettext.h"
  23 #include "LaTeXFeatures.h"
  24 #include "MetricsInfo.h"
  25 #include "OutputParams.h"
  26
  27 #include "frontends/alert.h"
  28
  29 #include "support/ExceptionMessage.h"
  30 #include "support/filetools.h"
  31 #include "support/lstrings.h"
  32 #include "support/lyxlib.h"
  33 #include "support/os.h"
  34 #include "support/Path.h"
  35 #include "support/textutils.h"
  36
  37 #include <boost/tokenizer.hpp>
  38
  39
  40 namespace lyx {
  41
  42 using support::absolutePath;
  43 using support::ascii_lowercase;
  44 using support::changeExtension;
  45 using support::contains;
  46 using support::copy;
  47 using support::DocFileName;
  48 using support::FileName;
  49 using support::findtexfile;
  50 using support::isFileReadable;
  51 using support::isValidLaTeXFilename;
  52 using support::latex_path;
  53 using support::ltrim;
  54 using support::makeAbsPath;
  55 using support::makeRelPath;
  56 using support::prefixIs;
  57 using support::removeExtension;
  58 using support::rtrim;
  59 using support::split;
  60 using support::subst;
  61 using support::tokenPos;
  62 using support::trim;
  63 using support::lowercase;
  64
  65 namespace Alert = frontend::Alert;
  66 namespace os = support::os;
  67
  68 using std::endl;
  69 using std::getline;
  70 using std::string;
  71 using std::ostream;
  72 using std::pair;
  73 using std::vector;
  74 using std::map;
  75
  76
  77 InsetBibtex::InsetBibtex(InsetCommandParams const & p)
  78         : InsetCommand(p, "bibtex")
  79 {}
  80
  81
  82 Inset * InsetBibtex::clone() const
  83 {
  84         return new InsetBibtex(*this);
  85 }
  86
  87
  88 void InsetBibtex::doDispatch(Cursor & cur, FuncRequest & cmd)
  89 {
  90         switch (cmd.action) {
  91
  92         case LFUN_INSET_MODIFY: {
  93                 InsetCommandParams p("bibtex");
  94                 try {
  95                         if (!InsetCommandMailer::string2params("bibtex",
  96                                         to_utf8(cmd.argument()), p)) {
  97                                 cur.noUpdate();
  98                                 break;
  99                         }
 100                 } catch (support::ExceptionMessage const & message) {
 101                         if (message.type_ == support::WarningException) {
 102                                 Alert::warning(message.title_, message.details_);
 103                                 cur.noUpdate();
 104                         } else
 105                                 throw message;
 106                         break;
 107                 }
 108                 setParams(p);
 109                 cur.buffer().updateBibfilesCache();
 110                 break;
 111         }
 112
 113         default:
 114                 InsetCommand::doDispatch(cur, cmd);
 115                 break;
 116         }
 117 }
 118
 119
 120 docstring const InsetBibtex::getScreenLabel(Buffer const &) const
 121 {
 122         return _("BibTeX Generated Bibliography");
 123 }
 124
 125
 126 namespace {
 127
 128 string normalize_name(Buffer const & buffer, OutputParams const & runparams,
 129                       string const & name, string const & ext)
 130 {
 131         string const fname = makeAbsPath(name, buffer.filePath()).absFilename();
 132         if (absolutePath(name) || !isFileReadable(FileName(fname + ext)))
 133                 return name;
 134         else if (!runparams.nice)
 135                 return fname;
 136         else
 137                 // FIXME UNICODE
 138                 return to_utf8(makeRelPath(from_utf8(fname),
 139                                            from_utf8(buffer.getMasterBuffer()->filePath())));
 140 }
 141
 142 }
 143
 144
 145 int InsetBibtex::latex(Buffer const & buffer, odocstream & os,
 146                        OutputParams const & runparams) const
 147 {
 148         // the sequence of the commands:
 149         // 1. \bibliographystyle{style}
 150         // 2. \addcontentsline{...} - if option bibtotoc set
 151         // 3. \bibliography{database}
 152         // and with bibtopic:
 153         // 1. \bibliographystyle{style}
 154         // 2. \begin{btSect}{database}
 155         // 3. \btPrint{Cited|NotCited|All}
 156         // 4. \end{btSect}
 157
 158         // Database(s)
 159         // If we are processing the LaTeX file in a temp directory then
 160         // copy the .bib databases to this temp directory, mangling their
 161         // names in the process. Store this mangled name in the list of
 162         // all databases.
 163         // (We need to do all this because BibTeX *really*, *really*
 164         // can't handle "files with spaces" and Windows users tend to
 165         // use such filenames.)
 166         // Otherwise, store the (maybe absolute) path to the original,
 167         // unmangled database name.
 168         typedef boost::char_separator<char_type> Separator;
 169         typedef boost::tokenizer<Separator, docstring::const_iterator, docstring> Tokenizer;
 170
 171         Separator const separator(from_ascii(",").c_str());
 172         // The tokenizer must not be called with temporary strings, since
 173         // it does not make a copy and uses iterators of the string further
 174         // down. getParam returns a reference, so this is OK.
 175         Tokenizer const tokens(getParam("bibfiles"), separator);
 176         Tokenizer::const_iterator const begin = tokens.begin();
 177         Tokenizer::const_iterator const end = tokens.end();
 178
 179         odocstringstream dbs;
 180         for (Tokenizer::const_iterator it = begin; it != end; ++it) {
 181                 docstring const input = trim(*it);
 182                 // FIXME UNICODE
 183                 string utf8input(to_utf8(input));
 184                 string database =
 185                         normalize_name(buffer, runparams, utf8input, ".bib");
 186                 FileName const try_in_file(makeAbsPath(database + ".bib", buffer.filePath()));
 187                 bool const not_from_texmf = isFileReadable(try_in_file);
 188
 189                 if (!runparams.inComment && !runparams.dryrun && !runparams.nice &&
 190                     not_from_texmf) {
 191
 192                         // mangledFilename() needs the extension
 193                         DocFileName const in_file = DocFileName(try_in_file);
 194                         database = removeExtension(in_file.mangledFilename());
 195                         FileName const out_file(makeAbsPath(database + ".bib",
 196                                         buffer.getMasterBuffer()->temppath()));
 197
 198                         bool const success = copy(in_file, out_file);
 199                         if (!success) {
 200                                 lyxerr << "Failed to copy '" << in_file
 201                                        << "' to '" << out_file << "'"
 202                                        << endl;
 203                         }
 204                 } else if (!runparams.inComment && runparams.nice && not_from_texmf &&
 205                            !isValidLaTeXFilename(database)) {
 206                                 frontend::Alert::warning(_("Invalid filename"),
 207                                                          _("The following filename is likely to cause trouble "
 208                                                            "when running the exported file through LaTeX: ") +
 209                                                             from_utf8(database));
 210                 }
 211
 212                 if (it != begin)
 213                         dbs << ',';
 214                 // FIXME UNICODE
 215                 dbs << from_utf8(latex_path(database));
 216         }
 217         docstring const db_out = dbs.str();
 218
 219         // Post this warning only once.
 220         static bool warned_about_spaces = false;
 221         if (!warned_about_spaces &&
 222             runparams.nice && db_out.find(' ') != docstring::npos) {
 223                 warned_about_spaces = true;
 224
 225                 Alert::warning(_("Export Warning!"),
 226                                _("There are spaces in the paths to your BibTeX databases.\n"
 227                                               "BibTeX will be unable to find them."));
 228
 229         }
 230
 231         // Style-Options
 232         string style = to_utf8(getParam("options")); // maybe empty! and with bibtotoc
 233         string bibtotoc;
 234         if (prefixIs(style, "bibtotoc")) {
 235                 bibtotoc = "bibtotoc";
 236                 if (contains(style, ',')) {
 237                         style = split(style, bibtotoc, ',');
 238                 }
 239         }
 240
 241         // line count
 242         int nlines = 0;
 243
 244         if (!style.empty()) {
 245                 string base =
 246                         normalize_name(buffer, runparams, style, ".bst");
 247                 FileName const try_in_file(makeAbsPath(base + ".bst", buffer.filePath()));
 248                 bool const not_from_texmf = isFileReadable(try_in_file);
 249                 // If this style does not come from texmf and we are not
 250                 // exporting to .tex copy it to the tmp directory.
 251                 // This prevents problems with spaces and 8bit charcaters
 252                 // in the file name.
 253                 if (!runparams.inComment && !runparams.dryrun && !runparams.nice &&
 254                     not_from_texmf) {
 255                         // use new style name
 256                         DocFileName const in_file = DocFileName(try_in_file);
 257                         base = removeExtension(in_file.mangledFilename());
 258                         FileName const out_file(makeAbsPath(base + ".bst",
 259                                         buffer.getMasterBuffer()->temppath()));
 260                         bool const success = copy(in_file, out_file);
 261                         if (!success) {
 262                                 lyxerr << "Failed to copy '" << in_file
 263                                        << "' to '" << out_file << "'"
 264                                        << endl;
 265                         }
 266                 }
 267                 // FIXME UNICODE
 268                 os << "\\bibliographystyle{"
 269                    << from_utf8(latex_path(normalize_name(buffer, runparams, base, ".bst")))
 270                    << "}\n";
 271                 nlines += 1;
 272         }
 273
 274         // Post this warning only once.
 275         static bool warned_about_bst_spaces = false;
 276         if (!warned_about_bst_spaces && runparams.nice && contains(style, ' ')) {
 277                 warned_about_bst_spaces = true;
 278                 Alert::warning(_("Export Warning!"),
 279                                _("There are spaces in the path to your BibTeX style file.\n"
 280                                               "BibTeX will be unable to find it."));
 281         }
 282
 283         if (!db_out.empty() && buffer.params().use_bibtopic){
 284                 os << "\\begin{btSect}{" << db_out << "}\n";
 285                 docstring btprint = getParam("btprint");
 286                 if (btprint.empty())
 287                         // default
 288                         btprint = from_ascii("btPrintCited");
 289                 os << "\\" << btprint << "\n"
 290                    << "\\end{btSect}\n";
 291                 nlines += 3;
 292         }
 293
 294         // bibtotoc-Option
 295         if (!bibtotoc.empty() && !buffer.params().use_bibtopic) {
 296                 // maybe a problem when a textclass has no "art" as
 297                 // part of its name, because it's than book.
 298                 // For the "official" lyx-layouts it's no problem to support
 299                 // all well
 300                 if (!contains(buffer.params().getTextClass().name(),
 301                               "art")) {
 302                         if (buffer.params().sides == TextClass::OneSide) {
 303                                 // oneside
 304                                 os << "\\clearpage";
 305                         } else {
 306                                 // twoside
 307                                 os << "\\cleardoublepage";
 308                         }
 309
 310                         // bookclass
 311                         os << "\\addcontentsline{toc}{chapter}{\\bibname}";
 312
 313                 } else {
 314                         // article class
 315                         os << "\\addcontentsline{toc}{section}{\\refname}";
 316                 }
 317         }
 318
 319         if (!db_out.empty() && !buffer.params().use_bibtopic){
 320                 os << "\\bibliography{" << db_out << "}\n";
 321                 nlines += 1;
 322         }
 323
 324         return nlines;
 325 }
 326
 327
 328 vector<FileName> const InsetBibtex::getFiles(Buffer const & buffer) const
 329 {
 330         FileName path(buffer.filePath());
 331         support::Path p(path);
 332
 333         vector<FileName> vec;
 334
 335         string tmp;
 336         // FIXME UNICODE
 337         string bibfiles = to_utf8(getParam("bibfiles"));
 338         bibfiles = split(bibfiles, tmp, ',');
 339         while (!tmp.empty()) {
 340                 FileName const file = findtexfile(changeExtension(tmp, "bib"), "bib");
 341                 LYXERR(Debug::LATEX) << "Bibfile: " << file << endl;
 342
 343                 // If we didn't find a matching file name just fail silently
 344                 if (!file.empty())
 345                         vec.push_back(file);
 346
 347                 // Get next file name
 348                 bibfiles = split(bibfiles, tmp, ',');
 349         }
 350
 351         return vec;
 352 }
 353
 354 namespace {
 355
 356         // methods for parsing bibtex files
 357
 358         typedef map<docstring, docstring> VarMap;
 359
 360         /// remove whitespace characters, optionally a single comma,
 361         /// and further whitespace characters from the stream.
 362         /// @return true if a comma was found, false otherwise
 363         ///
 364         bool removeWSAndComma(idocfstream & ifs) {
 365                 char_type ch;
 366
 367                 if (!ifs)
 368                         return false;
 369
 370                 // skip whitespace
 371                 do {
 372                         ifs.get(ch);
 373                 } while (ifs && isSpace(ch));
 374
 375                 if (!ifs)
 376                         return false;
 377
 378                 if (ch != ',') {
 379                         ifs.putback(ch);
 380                         return false;
 381                 }
 382
 383                 // skip whitespace
 384                 do {
 385                         ifs.get(ch);
 386                 } while (ifs && isSpace(ch));
 387
 388                 if (ifs) {
 389                         ifs.putback(ch);
 390                 }
 391
 392                 return true;
 393         }
 394
 395
 396         enum charCase {
 397                 makeLowerCase,
 398                 keepCase
 399         };
 400
 401         /// remove whitespace characters, read characer sequence
 402         /// not containing whitespace characters or characters in
 403         /// delimChars, and remove further whitespace characters.
 404         ///
 405         /// @return true if a string of length > 0 could be read.
 406         ///
 407         bool readTypeOrKey(docstring & val, idocfstream & ifs,
 408                 docstring const & delimChars, docstring const &illegalChars,
 409                 charCase chCase) {
 410
 411                 char_type ch;
 412
 413                 val.clear();
 414
 415                 if (!ifs)
 416                         return false;
 417
 418                 // skip whitespace
 419                 do {
 420                         ifs.get(ch);
 421                 } while (ifs && isSpace(ch));
 422
 423                 if (!ifs)
 424                         return false;
 425
 426                 // read value
 427                 bool legalChar = true;
 428                 while (ifs && !isSpace(ch) &&
 429                                                  delimChars.find(ch) == docstring::npos &&
 430                                                  (legalChar = (illegalChars.find(ch) == docstring::npos))
 431                                         )
 432                 {
 433                         if (chCase == makeLowerCase)
 434                                 val += lowercase(ch);
 435                         else
 436                                 val += ch;
 437                         ifs.get(ch);
 438                 }
 439
 440                 if (!legalChar) {
 441                         ifs.putback(ch);
 442                         return false;
 443                 }
 444
 445                 // skip whitespace
 446                 while (ifs && isSpace(ch)) {
 447                         ifs.get(ch);
 448                 }
 449
 450                 if (ifs) {
 451                         ifs.putback(ch);
 452                 }
 453
 454                 return val.length() > 0;
 455         }
 456
 457         /// read subsequent bibtex values that are delimited with a #-character.
 458         /// Concatenate all parts and replace names with the associated string in
 459         /// the variable strings.
 460         /// @return true if reading was successfull (all single parts were delimited
 461         /// correctly)
 462         bool readValue(docstring & val, idocfstream & ifs, const VarMap & strings) {
 463
 464                 char_type ch;
 465
 466                 val.clear();
 467
 468                 if (!ifs)
 469                         return false;
 470
 471                 do {
 472                         // skip whitespace
 473                         do {
 474                                 ifs.get(ch);
 475                         } while (ifs && isSpace(ch));
 476
 477                         if (!ifs)
 478                                 return false;
 479
 480                         // check for field type
 481                         if (isDigit(ch)) {
 482
 483                                 // read integer value
 484                                 do {
 485                                         val += ch;
 486                                         ifs.get(ch);
 487                                 } while (ifs && isDigit(ch));
 488
 489                                 if (!ifs)
 490                                         return false;
 491
 492                         } else if (ch == '"' || ch == '{') {
 493                                 // set end delimiter
 494                                 char_type delim = ch == '"' ? '"': '}';
 495
 496                                 //Skip whitespace
 497                                 do {
 498                                         ifs.get(ch);
 499                                 } while (ifs && isSpace(ch));
 500
 501                                 if (!ifs)
 502                                         return false;
 503
 504                                 //We now have the first non-whitespace character
 505                                 //We'll collapse adjacent whitespace.
 506                                 bool lastWasWhiteSpace = false;
 507
 508                                 // inside this delimited text braces must match.
 509                                 // Thus we can have a closing delimiter only
 510                                 // when nestLevel == 0
 511                                 int nestLevel = 0;
 512
 513                                 while (ifs && (nestLevel > 0 || ch != delim)) {
 514                                         if (isSpace(ch)) {
 515                                                 lastWasWhiteSpace = true;
 516                                                 ifs.get(ch);
 517                                                 continue;
 518                                         }
 519                                         //We output the space only after we stop getting
 520                                         //whitespace so as not to output any whitespace
 521                                         //at the end of the value.
 522                                         if (lastWasWhiteSpace) {
 523                                                 lastWasWhiteSpace = false;
 524                                                 val += ' ';
 525                                         }
 526
 527                                         val += ch;
 528
 529                                         // update nesting level
 530                                         switch (ch) {
 531                                                 case '{':
 532                                                         ++nestLevel;
 533                                                         break;
 534                                                 case '}':
 535                                                         --nestLevel;
 536                                                         if (nestLevel < 0) return false;
 537                                                         break;
 538                                         }
 539
 540                                         ifs.get(ch);
 541                                 }
 542
 543                                 if (!ifs)
 544                                         return false;
 545
 546                                 ifs.get(ch);
 547
 548                                 if (!ifs)
 549                                         return false;
 550
 551                         } else {
 552
 553                                 // reading a string name
 554                                 docstring strName;
 555
 556                                 while (ifs && !isSpace(ch) && ch != '#' && ch != ',' && ch != '}' && ch != ')') {
 557                                         strName += lowercase(ch);
 558                                         ifs.get(ch);
 559                                 }
 560
 561                                 if (!ifs)
 562                                         return false;
 563
 564                                 // replace the string with its assigned value or
 565                                 // discard it if it's not assigned
 566                                 if (strName.length()) {
 567                                         VarMap::const_iterator pos = strings.find(strName);
 568                                         if (pos != strings.end()) {
 569                                                 val += pos->second;
 570                                         }
 571                                 }
 572                         }
 573
 574                         // skip WS
 575                         while (ifs && isSpace(ch)) {
 576                                 ifs.get(ch);
 577                         }
 578
 579                         if (!ifs)
 580                                 return false;
 581
 582                         // continue reading next value on concatenate with '#'
 583                 } while (ch == '#');
 584
 585                 ifs.putback(ch);
 586
 587                 return true;
 588         }
 589 }
 590
 591
 592 // This method returns a comma separated list of Bibtex entries
 593 void InsetBibtex::fillWithBibKeys(Buffer const & buffer,
 594                 BiblioInfo & keylist, InsetIterator const & /*di*/) const
 595 {
 596         vector<FileName> const files = getFiles(buffer);
 597         for (vector<FileName>::const_iterator it = files.begin();
 598              it != files.end(); ++ it) {
 599                 // This bibtex parser is a first step to parse bibtex files
 600                 // more precisely.
 601                 //
 602                 // - it reads the whole bibtex entry and does a syntax check
 603                 //   (matching delimiters, missing commas,...
 604                 // - it recovers from errors starting with the next @-character
 605                 // - it reads @string definitions and replaces them in the
 606                 //   field values.
 607                 // - it accepts more characters in keys or value names than
 608                 //   bibtex does.
 609                 //
 610                 // Officially bibtex does only support ASCII, but in practice
 611                 // you can use the encoding of the main document as long as
 612                 // some elements like keys and names are pure ASCII. Therefore
 613                 // we convert the file from the buffer encoding.
 614                 // We don't restrict keys to ASCII in LyX, since our own
 615                 // InsetBibitem can generate non-ASCII keys, and nonstandard
 616                 // 8bit clean bibtex forks exist.
 617
 618                 idocfstream ifs(it->toFilesystemEncoding().c_str(),
 619                         std::ios_base::in,
 620                         buffer.params().encoding().iconvName());
 621
 622                 char_type ch;
 623                 VarMap strings;
 624
 625                 while (ifs) {
 626
 627                         ifs.get(ch);
 628                         if (!ifs)
 629                                 break;
 630
 631                         if (ch != '@')
 632                                 continue;
 633
 634                         docstring entryType;
 635
 636                         if (!readTypeOrKey(entryType, ifs, from_ascii("{("),
 637                                            docstring(), makeLowerCase) || !ifs)
 638                                 continue;
 639
 640                         if (entryType == from_ascii("comment")) {
 641
 642                                 ifs.ignore(std::numeric_limits<int>::max(), '\n');
 643                                 continue;
 644                         }
 645
 646                         ifs.get(ch);
 647                         if (!ifs)
 648                                 break;
 649
 650                         if ((ch != '(') && (ch != '{')) {
 651                                 // invalid entry delimiter
 652                                 ifs.putback(ch);
 653                                 continue;
 654                         }
 655
 656                         // process the entry
 657                         if (entryType == from_ascii("string")) {
 658
 659                                 // read string and add it to the strings map
 660                                 // (or replace it's old value)
 661                                 docstring name;
 662                                 docstring value;
 663
 664                                 if (!readTypeOrKey(name, ifs, from_ascii("="),
 665                                                    from_ascii("#{}(),"), makeLowerCase) || !ifs)
 666                                         continue;
 667
 668                                 // next char must be an equal sign
 669                                 ifs.get(ch);
 670                                 if (!ifs || ch != '=')
 671                                         continue;
 672
 673                                 if (!readValue(value, ifs, strings))
 674                                         continue;
 675
 676                                 strings[name] = value;
 677
 678                         } else if (entryType == from_ascii("preamble")) {
 679
 680                                 // preamble definitions are discarded.
 681                                 // can they be of any use in lyx?
 682                                 docstring value;
 683
 684                                 if (!readValue(value, ifs, strings))
 685                                         continue;
 686
 687                         } else {
 688
 689                                 // Citation entry. Try to read the key.
 690                                 docstring key;
 691
 692                                 if (!readTypeOrKey(key, ifs, from_ascii(","),
 693                                                    from_ascii("}"), keepCase) || !ifs)
 694                                         continue;
 695
 696                                 /////////////////////////////////////////////
 697                                 // now we have a key, so we will add an entry
 698                                 // (even if it's empty, as bibtex does)
 699                                 //
 700                                 // we now read the field = value pairs.
 701                                 // all items must be separated by a comma. If
 702                                 // it is missing the scanning of this entry is
 703                                 // stopped and the next is searched.
 704                                 docstring fields;
 705                                 docstring name;
 706                                 docstring value;
 707                                 docstring commaNewline;
 708                                 docstring data;
 709                                 BibTeXInfo keyvalmap;
 710                                 keyvalmap.entryType = entryType;
 711
 712                                 bool readNext = removeWSAndComma(ifs);
 713
 714                                 while (ifs && readNext) {
 715
 716                                         // read field name
 717                                         if (!readTypeOrKey(name, ifs, from_ascii("="),
 718                                                            from_ascii("{}(),"), makeLowerCase) || !ifs)
 719                                                 break;
 720
 721                                         // next char must be an equal sign
 722                                         ifs.get(ch);
 723                                         if (!ifs)
 724                                                 break;
 725                                         if (ch != '=') {
 726                                                 ifs.putback(ch);
 727                                                 break;
 728                                         }
 729
 730                                         // read field value
 731                                         if (!readValue(value, ifs, strings))
 732                                                 break;
 733
 734                                         keyvalmap[name] = value;
 735                                         data += "\n\n" + value;
 736                                         keylist.fieldNames.insert(name);
 737                                         readNext = removeWSAndComma(ifs);
 738                                 }
 739
 740                                 // add the new entry
 741                                 keylist.entryTypes.insert(entryType);
 742                                 keyvalmap.allData = data;
 743                                 keyvalmap.isBibTeX = true;
 744                                 keyvalmap.bibKey = key;
 745                                 keylist[key] = keyvalmap;
 746                         }
 747                 } //< searching '@'
 748         } //< for loop over files
 749 }
 750
 751
 752
 753 bool InsetBibtex::addDatabase(string const & db)
 754 {
 755         // FIXME UNICODE
 756         string bibfiles(to_utf8(getParam("bibfiles")));
 757         if (tokenPos(bibfiles, ',', db) == -1) {
 758                 if (!bibfiles.empty())
 759                         bibfiles += ',';
 760                 setParam("bibfiles", from_utf8(bibfiles + db));
 761                 return true;
 762         }
 763         return false;
 764 }
 765
 766
 767 bool InsetBibtex::delDatabase(string const & db)
 768 {
 769         // FIXME UNICODE
 770         string bibfiles(to_utf8(getParam("bibfiles")));
 771         if (contains(bibfiles, db)) {
 772                 int const n = tokenPos(bibfiles, ',', db);
 773                 string bd = db;
 774                 if (n > 0) {
 775                         // this is not the first database
 776                         string tmp = ',' + bd;
 777                         setParam("bibfiles", from_utf8(subst(bibfiles, tmp, string())));
 778                 } else if (n == 0)
 779                         // this is the first (or only) database
 780                         setParam("bibfiles", from_utf8(split(bibfiles, bd, ',')));
 781                 else
 782                         return false;
 783         }
 784         return true;
 785 }
 786
 787
 788 void InsetBibtex::validate(LaTeXFeatures & features) const
 789 {
 790         if (features.bufferParams().use_bibtopic)
 791                 features.require("bibtopic");
 792 }
 793
 794
 795 } // namespace lyx