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