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