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