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 (FileName(name).isAbsolute() || !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                 docstring btprint = getParam("btprint");
 301                 if (btprint == "btPrintAll") {
 302                         os << "\\nocite{*}\n";
 303                         nlines += 1;
 304                 }
 305                 os << "\\bibliography{" << db_out << "}\n";
 306                 nlines += 1;
 307         }
 308
 309         return nlines;
 310 }
 311
 312
 313 FileNameList const InsetBibtex::getFiles(Buffer const & buffer) const
 314 {
 315         FileName path(buffer.filePath());
 316         PathChanger p(path);
 317
 318         FileNameList vec;
 319
 320         string tmp;
 321         // FIXME UNICODE
 322         string bibfiles = to_utf8(getParam("bibfiles"));
 323         bibfiles = split(bibfiles, tmp, ',');
 324         while (!tmp.empty()) {
 325                 FileName const file = findtexfile(changeExtension(tmp, "bib"), "bib");
 326                 LYXERR(Debug::LATEX, "Bibfile: " << file);
 327
 328                 // If we didn't find a matching file name just fail silently
 329                 if (!file.empty())
 330                         vec.push_back(file);
 331
 332                 // Get next file name
 333                 bibfiles = split(bibfiles, tmp, ',');
 334         }
 335
 336         return vec;
 337 }
 338
 339 namespace {
 340
 341         // methods for parsing bibtex files
 342
 343         typedef map<docstring, docstring> VarMap;
 344
 345         /// remove whitespace characters, optionally a single comma,
 346         /// and further whitespace characters from the stream.
 347         /// @return true if a comma was found, false otherwise
 348         ///
 349         bool removeWSAndComma(idocfstream & ifs) {
 350                 char_type ch;
 351
 352                 if (!ifs)
 353                         return false;
 354
 355                 // skip whitespace
 356                 do {
 357                         ifs.get(ch);
 358                 } while (ifs && isSpace(ch));
 359
 360                 if (!ifs)
 361                         return false;
 362
 363                 if (ch != ',') {
 364                         ifs.putback(ch);
 365                         return false;
 366                 }
 367
 368                 // skip whitespace
 369                 do {
 370                         ifs.get(ch);
 371                 } while (ifs && isSpace(ch));
 372
 373                 if (ifs) {
 374                         ifs.putback(ch);
 375                 }
 376
 377                 return true;
 378         }
 379
 380
 381         enum charCase {
 382                 makeLowerCase,
 383                 keepCase
 384         };
 385
 386         /// remove whitespace characters, read characer sequence
 387         /// not containing whitespace characters or characters in
 388         /// delimChars, and remove further whitespace characters.
 389         ///
 390         /// @return true if a string of length > 0 could be read.
 391         ///
 392         bool readTypeOrKey(docstring & val, idocfstream & ifs,
 393                 docstring const & delimChars, docstring const &illegalChars,
 394                 charCase chCase) {
 395
 396                 char_type ch;
 397
 398                 val.clear();
 399
 400                 if (!ifs)
 401                         return false;
 402
 403                 // skip whitespace
 404                 do {
 405                         ifs.get(ch);
 406                 } while (ifs && isSpace(ch));
 407
 408                 if (!ifs)
 409                         return false;
 410
 411                 // read value
 412                 bool legalChar = true;
 413                 while (ifs && !isSpace(ch) &&
 414                                                  delimChars.find(ch) == docstring::npos &&
 415                                                  (legalChar = (illegalChars.find(ch) == docstring::npos))
 416                                         )
 417                 {
 418                         if (chCase == makeLowerCase)
 419                                 val += lowercase(ch);
 420                         else
 421                                 val += ch;
 422                         ifs.get(ch);
 423                 }
 424
 425                 if (!legalChar) {
 426                         ifs.putback(ch);
 427                         return false;
 428                 }
 429
 430                 // skip whitespace
 431                 while (ifs && isSpace(ch)) {
 432                         ifs.get(ch);
 433                 }
 434
 435                 if (ifs) {
 436                         ifs.putback(ch);
 437                 }
 438
 439                 return val.length() > 0;
 440         }
 441
 442         /// read subsequent bibtex values that are delimited with a #-character.
 443         /// Concatenate all parts and replace names with the associated string in
 444         /// the variable strings.
 445         /// @return true if reading was successfull (all single parts were delimited
 446         /// correctly)
 447         bool readValue(docstring & val, idocfstream & ifs, const VarMap & strings) {
 448
 449                 char_type ch;
 450
 451                 val.clear();
 452
 453                 if (!ifs)
 454                         return false;
 455
 456                 do {
 457                         // skip whitespace
 458                         do {
 459                                 ifs.get(ch);
 460                         } while (ifs && isSpace(ch));
 461
 462                         if (!ifs)
 463                                 return false;
 464
 465                         // check for field type
 466                         if (isDigit(ch)) {
 467
 468                                 // read integer value
 469                                 do {
 470                                         val += ch;
 471                                         ifs.get(ch);
 472                                 } while (ifs && isDigit(ch));
 473
 474                                 if (!ifs)
 475                                         return false;
 476
 477                         } else if (ch == '"' || ch == '{') {
 478                                 // set end delimiter
 479                                 char_type delim = ch == '"' ? '"': '}';
 480
 481                                 //Skip whitespace
 482                                 do {
 483                                         ifs.get(ch);
 484                                 } while (ifs && isSpace(ch));
 485
 486                                 if (!ifs)
 487                                         return false;
 488
 489                                 //We now have the first non-whitespace character
 490                                 //We'll collapse adjacent whitespace.
 491                                 bool lastWasWhiteSpace = false;
 492
 493                                 // inside this delimited text braces must match.
 494                                 // Thus we can have a closing delimiter only
 495                                 // when nestLevel == 0
 496                                 int nestLevel = 0;
 497
 498                                 while (ifs && (nestLevel > 0 || ch != delim)) {
 499                                         if (isSpace(ch)) {
 500                                                 lastWasWhiteSpace = true;
 501                                                 ifs.get(ch);
 502                                                 continue;
 503                                         }
 504                                         //We output the space only after we stop getting
 505                                         //whitespace so as not to output any whitespace
 506                                         //at the end of the value.
 507                                         if (lastWasWhiteSpace) {
 508                                                 lastWasWhiteSpace = false;
 509                                                 val += ' ';
 510                                         }
 511
 512                                         val += ch;
 513
 514                                         // update nesting level
 515                                         switch (ch) {
 516                                                 case '{':
 517                                                         ++nestLevel;
 518                                                         break;
 519                                                 case '}':
 520                                                         --nestLevel;
 521                                                         if (nestLevel < 0) return false;
 522                                                         break;
 523                                         }
 524
 525                                         ifs.get(ch);
 526                                 }
 527
 528                                 if (!ifs)
 529                                         return false;
 530
 531                                 ifs.get(ch);
 532
 533                                 if (!ifs)
 534                                         return false;
 535
 536                         } else {
 537
 538                                 // reading a string name
 539                                 docstring strName;
 540
 541                                 while (ifs && !isSpace(ch) && ch != '#' && ch != ',' && ch != '}' && ch != ')') {
 542                                         strName += lowercase(ch);
 543                                         ifs.get(ch);
 544                                 }
 545
 546                                 if (!ifs)
 547                                         return false;
 548
 549                                 // replace the string with its assigned value or
 550                                 // discard it if it's not assigned
 551                                 if (strName.length()) {
 552                                         VarMap::const_iterator pos = strings.find(strName);
 553                                         if (pos != strings.end()) {
 554                                                 val += pos->second;
 555                                         }
 556                                 }
 557                         }
 558
 559                         // skip WS
 560                         while (ifs && isSpace(ch)) {
 561                                 ifs.get(ch);
 562                         }
 563
 564                         if (!ifs)
 565                                 return false;
 566
 567                         // continue reading next value on concatenate with '#'
 568                 } while (ch == '#');
 569
 570                 ifs.putback(ch);
 571
 572                 return true;
 573         }
 574 }
 575
 576
 577 // This method returns a comma separated list of Bibtex entries
 578 void InsetBibtex::fillWithBibKeys(Buffer const & buffer,
 579                 BiblioInfo & keylist, InsetIterator const & /*di*/) const
 580 {
 581         FileNameList const files = getFiles(buffer);
 582         for (vector<FileName>::const_iterator it = files.begin();
 583              it != files.end(); ++ it) {
 584                 // This bibtex parser is a first step to parse bibtex files
 585                 // more precisely.
 586                 //
 587                 // - it reads the whole bibtex entry and does a syntax check
 588                 //   (matching delimiters, missing commas,...
 589                 // - it recovers from errors starting with the next @-character
 590                 // - it reads @string definitions and replaces them in the
 591                 //   field values.
 592                 // - it accepts more characters in keys or value names than
 593                 //   bibtex does.
 594                 //
 595                 // Officially bibtex does only support ASCII, but in practice
 596                 // you can use the encoding of the main document as long as
 597                 // some elements like keys and names are pure ASCII. Therefore
 598                 // we convert the file from the buffer encoding.
 599                 // We don't restrict keys to ASCII in LyX, since our own
 600                 // InsetBibitem can generate non-ASCII keys, and nonstandard
 601                 // 8bit clean bibtex forks exist.
 602
 603                 idocfstream ifs(it->toFilesystemEncoding().c_str(),
 604                         ios_base::in,
 605                         buffer.params().encoding().iconvName());
 606
 607                 char_type ch;
 608                 VarMap strings;
 609
 610                 while (ifs) {
 611
 612                         ifs.get(ch);
 613                         if (!ifs)
 614                                 break;
 615
 616                         if (ch != '@')
 617                                 continue;
 618
 619                         docstring entryType;
 620
 621                         if (!readTypeOrKey(entryType, ifs, from_ascii("{("),
 622                                            docstring(), makeLowerCase) || !ifs)
 623                                 continue;
 624
 625                         if (entryType == from_ascii("comment")) {
 626
 627                                 ifs.ignore(numeric_limits<int>::max(), '\n');
 628                                 continue;
 629                         }
 630
 631                         ifs.get(ch);
 632                         if (!ifs)
 633                                 break;
 634
 635                         if ((ch != '(') && (ch != '{')) {
 636                                 // invalid entry delimiter
 637                                 ifs.putback(ch);
 638                                 continue;
 639                         }
 640
 641                         // process the entry
 642                         if (entryType == from_ascii("string")) {
 643
 644                                 // read string and add it to the strings map
 645                                 // (or replace it's old value)
 646                                 docstring name;
 647                                 docstring value;
 648
 649                                 if (!readTypeOrKey(name, ifs, from_ascii("="),
 650                                                    from_ascii("#{}(),"), makeLowerCase) || !ifs)
 651                                         continue;
 652
 653                                 // next char must be an equal sign
 654                                 ifs.get(ch);
 655                                 if (!ifs || ch != '=')
 656                                         continue;
 657
 658                                 if (!readValue(value, ifs, strings))
 659                                         continue;
 660
 661                                 strings[name] = value;
 662
 663                         } else if (entryType == from_ascii("preamble")) {
 664
 665                                 // preamble definitions are discarded.
 666                                 // can they be of any use in lyx?
 667                                 docstring value;
 668
 669                                 if (!readValue(value, ifs, strings))
 670                                         continue;
 671
 672                         } else {
 673
 674                                 // Citation entry. Try to read the key.
 675                                 docstring key;
 676
 677                                 if (!readTypeOrKey(key, ifs, from_ascii(","),
 678                                                    from_ascii("}"), keepCase) || !ifs)
 679                                         continue;
 680
 681                                 /////////////////////////////////////////////
 682                                 // now we have a key, so we will add an entry
 683                                 // (even if it's empty, as bibtex does)
 684                                 //
 685                                 // we now read the field = value pairs.
 686                                 // all items must be separated by a comma. If
 687                                 // it is missing the scanning of this entry is
 688                                 // stopped and the next is searched.
 689                                 docstring fields;
 690                                 docstring name;
 691                                 docstring value;
 692                                 docstring commaNewline;
 693                                 docstring data;
 694                                 BibTeXInfo keyvalmap;
 695                                 keyvalmap.entryType = entryType;
 696
 697                                 bool readNext = removeWSAndComma(ifs);
 698
 699                                 while (ifs && readNext) {
 700
 701                                         // read field name
 702                                         if (!readTypeOrKey(name, ifs, from_ascii("="),
 703                                                            from_ascii("{}(),"), makeLowerCase) || !ifs)
 704                                                 break;
 705
 706                                         // next char must be an equal sign
 707                                         ifs.get(ch);
 708                                         if (!ifs)
 709                                                 break;
 710                                         if (ch != '=') {
 711                                                 ifs.putback(ch);
 712                                                 break;
 713                                         }
 714
 715                                         // read field value
 716                                         if (!readValue(value, ifs, strings))
 717                                                 break;
 718
 719                                         keyvalmap[name] = value;
 720                                         data += "\n\n" + value;
 721                                         keylist.fieldNames.insert(name);
 722                                         readNext = removeWSAndComma(ifs);
 723                                 }
 724
 725                                 // add the new entry
 726                                 keylist.entryTypes.insert(entryType);
 727                                 keyvalmap.allData = data;
 728                                 keyvalmap.isBibTeX = true;
 729                                 keyvalmap.bibKey = key;
 730                                 keylist[key] = keyvalmap;
 731                         }
 732                 } //< searching '@'
 733         } //< for loop over files
 734 }
 735
 736
 737
 738 bool InsetBibtex::addDatabase(string const & db)
 739 {
 740         // FIXME UNICODE
 741         string bibfiles(to_utf8(getParam("bibfiles")));
 742         if (tokenPos(bibfiles, ',', db) == -1) {
 743                 if (!bibfiles.empty())
 744                         bibfiles += ',';
 745                 setParam("bibfiles", from_utf8(bibfiles + db));
 746                 return true;
 747         }
 748         return false;
 749 }
 750
 751
 752 bool InsetBibtex::delDatabase(string const & db)
 753 {
 754         // FIXME UNICODE
 755         string bibfiles(to_utf8(getParam("bibfiles")));
 756         if (contains(bibfiles, db)) {
 757                 int const n = tokenPos(bibfiles, ',', db);
 758                 string bd = db;
 759                 if (n > 0) {
 760                         // this is not the first database
 761                         string tmp = ',' + bd;
 762                         setParam("bibfiles", from_utf8(subst(bibfiles, tmp, string())));
 763                 } else if (n == 0)
 764                         // this is the first (or only) database
 765                         setParam("bibfiles", from_utf8(split(bibfiles, bd, ',')));
 766                 else
 767                         return false;
 768         }
 769         return true;
 770 }
 771
 772
 773 void InsetBibtex::validate(LaTeXFeatures & features) const
 774 {
 775         if (features.bufferParams().use_bibtopic)
 776                 features.require("bibtopic");
 777 }
 778
 779
 780 } // namespace lyx