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 "Encoding.h"
  20 #include "Format.h"
  21 #include "FuncRequest.h"
  22 #include "FuncStatus.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/convert.h"
  31 #include "support/debug.h"
  32 #include "support/docstream.h"
  33 #include "support/ExceptionMessage.h"
  34 #include "support/filetools.h"
  35 #include "support/gettext.h"
  36 #include "support/lstrings.h"
  37 #include "support/os.h"
  38 #include "support/Path.h"
  39 #include "support/textutils.h"
  40
  41 #include <limits>
  42
  43 using namespace std;
  44 using namespace lyx::support;
  45
  46 namespace lyx {
  47
  48 namespace Alert = frontend::Alert;
  49 namespace os = support::os;
  50
  51
  52 InsetBibtex::InsetBibtex(Buffer const & buf, InsetCommandParams const & p)
  53         : InsetCommand(p, "bibtex")
  54 {
  55         Inset::setBuffer(const_cast<Buffer &>(buf));
  56         buffer_->invalidateBibinfoCache();
  57 }
  58
  59
  60 InsetBibtex::~InsetBibtex()
  61 {
  62         if (isBufferValid())
  63                 buffer_->invalidateBibinfoCache();
  64 }
  65
  66
  67 ParamInfo const & InsetBibtex::findInfo(string const & /* cmdName */)
  68 {
  69         static ParamInfo param_info_;
  70         if (param_info_.empty()) {
  71                 param_info_.add("btprint", ParamInfo::LATEX_OPTIONAL);
  72                 param_info_.add("bibfiles", ParamInfo::LATEX_REQUIRED);
  73                 param_info_.add("options", ParamInfo::LYX_INTERNAL);
  74         }
  75         return param_info_;
  76 }
  77
  78
  79 void InsetBibtex::doDispatch(Cursor & cur, FuncRequest & cmd)
  80 {
  81         switch (cmd.action) {
  82
  83         case LFUN_INSET_EDIT:
  84                 editDatabases();
  85                 break;
  86
  87         case LFUN_INSET_MODIFY: {
  88                 InsetCommandParams p(BIBTEX_CODE);
  89                 try {
  90                         if (!InsetCommand::string2params("bibtex",
  91                                         to_utf8(cmd.argument()), p)) {
  92                                 cur.noUpdate();
  93                                 break;
  94                         }
  95                 } catch (ExceptionMessage const & message) {
  96                         if (message.type_ == WarningException) {
  97                                 Alert::warning(message.title_, message.details_);
  98                                 cur.noUpdate();
  99                         } else
 100                                 throw message;
 101                         break;
 102                 }
 103                 //
 104                 setParams(p);
 105                 buffer().updateBibfilesCache();
 106                 break;
 107         }
 108
 109         default:
 110                 InsetCommand::doDispatch(cur, cmd);
 111                 break;
 112         }
 113 }
 114
 115
 116 bool InsetBibtex::getStatus(Cursor & cur, FuncRequest const & cmd,
 117                 FuncStatus & flag) const
 118 {
 119         switch (cmd.action) {
 120         case LFUN_INSET_EDIT:
 121                 flag.setEnabled(true);
 122                 return true;
 123
 124         default:
 125                 return InsetCommand::getStatus(cur, cmd, flag);
 126         }
 127 }
 128
 129
 130 void InsetBibtex::editDatabases() const
 131 {
 132         vector<docstring> bibfilelist = getVectorFromString(getParam("bibfiles"));
 133
 134         if (bibfilelist.empty())
 135                 return;
 136
 137         int nr_databases = bibfilelist.size();
 138         if (nr_databases > 1) {
 139                         docstring message = bformat(_("The BibTeX inset includes %1$s databases.\n"
 140                                                        "If you proceed, all of them will be opened."),
 141                                                         convert<docstring>(nr_databases));
 142                         int const ret = Alert::prompt(_("Open Databases?"),
 143                                 message, 0, 1, _("&Cancel"), _("&Proceed"));
 144
 145                         if (ret == 0)
 146                                 return;
 147         }
 148
 149         vector<docstring>::const_iterator it = bibfilelist.begin();
 150         vector<docstring>::const_iterator en = bibfilelist.end();
 151         for (; it != en; ++it) {
 152                 FileName bibfile = getBibTeXPath(*it, buffer());
 153                 formats.edit(buffer(), bibfile,
 154                      formats.getFormatFromFile(bibfile));
 155         }
 156 }
 157
 158
 159 docstring InsetBibtex::screenLabel() const
 160 {
 161         return _("BibTeX Generated Bibliography");
 162 }
 163
 164
 165 docstring InsetBibtex::toolTip(BufferView const & /*bv*/, int /*x*/, int /*y*/) const
 166 {
 167         docstring item = from_ascii("* ");
 168         docstring tip = _("Databases:") + "\n";
 169         vector<docstring> bibfilelist = getVectorFromString(getParam("bibfiles"));
 170
 171         if (bibfilelist.empty()) {
 172                 tip += item;
 173                 tip += _("none");
 174         } else {
 175                 vector<docstring>::const_iterator it = bibfilelist.begin();
 176                 vector<docstring>::const_iterator en = bibfilelist.end();
 177                 for (; it != en; ++it) {
 178                         tip += item;
 179                         tip += *it + "\n";
 180                 }
 181         }
 182
 183         // Style-Options
 184         bool toc = false;
 185         docstring style = getParam("options"); // maybe empty! and with bibtotoc
 186         docstring bibtotoc = from_ascii("bibtotoc");
 187         if (prefixIs(style, bibtotoc)) {
 188                 toc = true;
 189                 if (contains(style, char_type(',')))
 190                         style = split(style, bibtotoc, char_type(','));
 191         }
 192
 193         tip += _("Style File:") +"\n";
 194         tip += item;
 195         if (!style.empty())
 196                 tip += style;
 197         else
 198                 tip += _("none");
 199
 200         tip += "\n" + _("Lists:") + " ";
 201         docstring btprint = getParam("btprint");
 202                 if (btprint == "btPrintAll")
 203                         tip += _("all references");
 204                 else if (btprint == "btPrintNotCited")
 205                         tip += _("all uncited references");
 206                 else
 207                         tip += _("all cited references");
 208
 209         if (toc) {
 210                 tip += ", ";
 211                 tip += _("included in TOC");
 212         }
 213
 214         return tip;
 215 }
 216
 217
 218 static string normalizeName(Buffer const & buffer,
 219         OutputParams const & runparams, string const & name, string const & ext)
 220 {
 221         string const fname = makeAbsPath(name, buffer.filePath()).absFilename();
 222         if (FileName(name).isAbsolute() || !FileName(fname + ext).isReadableFile())
 223                 return name;
 224         if (!runparams.nice)
 225                 return fname;
 226
 227         // FIXME UNICODE
 228         return to_utf8(makeRelPath(from_utf8(fname),
 229                                          from_utf8(buffer.masterBuffer()->filePath())));
 230 }
 231
 232
 233 int InsetBibtex::latex(odocstream & os, OutputParams const & runparams) const
 234 {
 235         // the sequence of the commands:
 236         // 1. \bibliographystyle{style}
 237         // 2. \addcontentsline{...} - if option bibtotoc set
 238         // 3. \bibliography{database}
 239         // and with bibtopic:
 240         // 1. \bibliographystyle{style}
 241         // 2. \begin{btSect}{database}
 242         // 3. \btPrint{Cited|NotCited|All}
 243         // 4. \end{btSect}
 244
 245         // Database(s)
 246         // If we are processing the LaTeX file in a temp directory then
 247         // copy the .bib databases to this temp directory, mangling their
 248         // names in the process. Store this mangled name in the list of
 249         // all databases.
 250         // (We need to do all this because BibTeX *really*, *really*
 251         // can't handle "files with spaces" and Windows users tend to
 252         // use such filenames.)
 253         // Otherwise, store the (maybe absolute) path to the original,
 254         // unmangled database name.
 255         vector<docstring> bibfilelist = getVectorFromString(getParam("bibfiles"));
 256         vector<docstring>::const_iterator it = bibfilelist.begin();
 257         vector<docstring>::const_iterator en = bibfilelist.end();
 258         odocstringstream dbs;
 259         bool didone = false;
 260
 261         for (; it != en; ++it) {
 262                 string utf8input = to_utf8(*it);
 263                 string database =
 264                         normalizeName(buffer(), runparams, utf8input, ".bib");
 265                 FileName const try_in_file =
 266                         makeAbsPath(database + ".bib", buffer().filePath());
 267                 bool const not_from_texmf = try_in_file.isReadableFile();
 268
 269                 if (!runparams.inComment && !runparams.dryrun && !runparams.nice &&
 270                     not_from_texmf) {
 271                         // mangledFilename() needs the extension
 272                         DocFileName const in_file = DocFileName(try_in_file);
 273                         database = removeExtension(in_file.mangledFilename());
 274                         FileName const out_file = makeAbsPath(database + ".bib",
 275                                         buffer().masterBuffer()->temppath());
 276
 277                         bool const success = in_file.copyTo(out_file);
 278                         if (!success) {
 279                                 lyxerr << "Failed to copy '" << in_file
 280                                        << "' to '" << out_file << "'"
 281                                        << endl;
 282                         }
 283                 } else if (!runparams.inComment && runparams.nice && not_from_texmf &&
 284                            !isValidLaTeXFilename(database)) {
 285                                 frontend::Alert::warning(_("Invalid filename"),
 286                                                          _("The following filename is likely to cause trouble "
 287                                                            "when running the exported file through LaTeX: ") +
 288                                                             from_utf8(database));
 289                 }
 290
 291                 if (didone)
 292                         dbs << ',';
 293                 else
 294                         didone = true;
 295                 // FIXME UNICODE
 296                 dbs << from_utf8(latex_path(database));
 297         }
 298         docstring const db_out = dbs.str();
 299
 300         // Post this warning only once.
 301         static bool warned_about_spaces = false;
 302         if (!warned_about_spaces &&
 303             runparams.nice && db_out.find(' ') != docstring::npos) {
 304                 warned_about_spaces = true;
 305                 Alert::warning(_("Export Warning!"),
 306                                _("There are spaces in the paths to your BibTeX databases.\n"
 307                                               "BibTeX will be unable to find them."));
 308         }
 309         // Style-Options
 310         string style = to_utf8(getParam("options")); // maybe empty! and with bibtotoc
 311         string bibtotoc;
 312         if (prefixIs(style, "bibtotoc")) {
 313                 bibtotoc = "bibtotoc";
 314                 if (contains(style, ','))
 315                         style = split(style, bibtotoc, ',');
 316         }
 317
 318         // line count
 319         int nlines = 0;
 320
 321         if (!style.empty()) {
 322                 string base = normalizeName(buffer(), runparams, style, ".bst");
 323                 FileName const try_in_file =
 324                         makeAbsPath(base + ".bst", buffer().filePath());
 325                 bool const not_from_texmf = try_in_file.isReadableFile();
 326                 // If this style does not come from texmf and we are not
 327                 // exporting to .tex copy it to the tmp directory.
 328                 // This prevents problems with spaces and 8bit charcaters
 329                 // in the file name.
 330                 if (!runparams.inComment && !runparams.dryrun && !runparams.nice &&
 331                     not_from_texmf) {
 332                         // use new style name
 333                         DocFileName const in_file = DocFileName(try_in_file);
 334                         base = removeExtension(in_file.mangledFilename());
 335                         FileName const out_file = makeAbsPath(base + ".bst",
 336                                         buffer().masterBuffer()->temppath());
 337                         bool const success = in_file.copyTo(out_file);
 338                         if (!success) {
 339                                 lyxerr << "Failed to copy '" << in_file
 340                                        << "' to '" << out_file << "'"
 341                                        << endl;
 342                         }
 343                 }
 344                 // FIXME UNICODE
 345                 os << "\\bibliographystyle{"
 346                    << from_utf8(latex_path(normalizeName(buffer(), runparams, base, ".bst")))
 347                    << "}\n";
 348                 nlines += 1;
 349         }
 350
 351         // Post this warning only once.
 352         static bool warned_about_bst_spaces = false;
 353         if (!warned_about_bst_spaces && runparams.nice && contains(style, ' ')) {
 354                 warned_about_bst_spaces = true;
 355                 Alert::warning(_("Export Warning!"),
 356                                _("There are spaces in the path to your BibTeX style file.\n"
 357                                               "BibTeX will be unable to find it."));
 358         }
 359
 360         if (!db_out.empty() && buffer().params().use_bibtopic) {
 361                 os << "\\begin{btSect}{" << db_out << "}\n";
 362                 docstring btprint = getParam("btprint");
 363                 if (btprint.empty())
 364                         // default
 365                         btprint = from_ascii("btPrintCited");
 366                 os << "\\" << btprint << "\n"
 367                    << "\\end{btSect}\n";
 368                 nlines += 3;
 369         }
 370
 371         // bibtotoc-Option
 372         if (!bibtotoc.empty() && !buffer().params().use_bibtopic) {
 373                 if (buffer().params().documentClass().hasLaTeXLayout("chapter")) {
 374                         if (buffer().params().sides == OneSide) {
 375                                 // oneside
 376                                 os << "\\clearpage";
 377                         } else {
 378                                 // twoside
 379                                 os << "\\cleardoublepage";
 380                         }
 381                         os << "\\addcontentsline{toc}{chapter}{\\bibname}";
 382                 } else if (buffer().params().documentClass().hasLaTeXLayout("section"))
 383                         os << "\\addcontentsline{toc}{section}{\\refname}";
 384         }
 385
 386         if (!db_out.empty() && !buffer().params().use_bibtopic) {
 387                 docstring btprint = getParam("btprint");
 388                 if (btprint == "btPrintAll") {
 389                         os << "\\nocite{*}\n";
 390                         nlines += 1;
 391                 }
 392                 os << "\\bibliography{" << db_out << "}\n";
 393                 nlines += 1;
 394         }
 395
 396         return nlines;
 397 }
 398
 399
 400 support::FileNameList InsetBibtex::getBibFiles() const
 401 {
 402         FileName path(buffer().filePath());
 403         support::PathChanger p(path);
 404
 405         support::FileNameList vec;
 406
 407         vector<docstring> bibfilelist = getVectorFromString(getParam("bibfiles"));
 408         vector<docstring>::const_iterator it = bibfilelist.begin();
 409         vector<docstring>::const_iterator en = bibfilelist.end();
 410         for (; it != en; ++it) {
 411                 FileName const file =
 412                         findtexfile(changeExtension(to_utf8(*it), "bib"), "bib");
 413
 414                 if (!file.empty())
 415                         vec.push_back(file);
 416                 else
 417                         LYXERR0("Couldn't find " + to_utf8(*it) + " in InsetBibtex::getBibFiles()!");
 418         }
 419
 420         return vec;
 421
 422 }
 423
 424 namespace {
 425
 426         // methods for parsing bibtex files
 427
 428         typedef map<docstring, docstring> VarMap;
 429
 430         /// remove whitespace characters, optionally a single comma,
 431         /// and further whitespace characters from the stream.
 432         /// @return true if a comma was found, false otherwise
 433         ///
 434         bool removeWSAndComma(ifdocstream & ifs) {
 435                 char_type ch;
 436
 437                 if (!ifs)
 438                         return false;
 439
 440                 // skip whitespace
 441                 do {
 442                         ifs.get(ch);
 443                 } while (ifs && isSpace(ch));
 444
 445                 if (!ifs)
 446                         return false;
 447
 448                 if (ch != ',') {
 449                         ifs.putback(ch);
 450                         return false;
 451                 }
 452
 453                 // skip whitespace
 454                 do {
 455                         ifs.get(ch);
 456                 } while (ifs && isSpace(ch));
 457
 458                 if (ifs) {
 459                         ifs.putback(ch);
 460                 }
 461
 462                 return true;
 463         }
 464
 465
 466         enum charCase {
 467                 makeLowerCase,
 468                 keepCase
 469         };
 470
 471         /// remove whitespace characters, read characer sequence
 472         /// not containing whitespace characters or characters in
 473         /// delimChars, and remove further whitespace characters.
 474         ///
 475         /// @return true if a string of length > 0 could be read.
 476         ///
 477         bool readTypeOrKey(docstring & val, ifdocstream & ifs,
 478                 docstring const & delimChars, docstring const &illegalChars,
 479                 charCase chCase) {
 480
 481                 char_type ch;
 482
 483                 val.clear();
 484
 485                 if (!ifs)
 486                         return false;
 487
 488                 // skip whitespace
 489                 do {
 490                         ifs.get(ch);
 491                 } while (ifs && isSpace(ch));
 492
 493                 if (!ifs)
 494                         return false;
 495
 496                 // read value
 497                 bool legalChar = true;
 498                 while (ifs && !isSpace(ch) &&
 499                                                  delimChars.find(ch) == docstring::npos &&
 500                                                  (legalChar = (illegalChars.find(ch) == docstring::npos))
 501                                         )
 502                 {
 503                         if (chCase == makeLowerCase)
 504                                 val += lowercase(ch);
 505                         else
 506                                 val += ch;
 507                         ifs.get(ch);
 508                 }
 509
 510                 if (!legalChar) {
 511                         ifs.putback(ch);
 512                         return false;
 513                 }
 514
 515                 // skip whitespace
 516                 while (ifs && isSpace(ch)) {
 517                         ifs.get(ch);
 518                 }
 519
 520                 if (ifs) {
 521                         ifs.putback(ch);
 522                 }
 523
 524                 return val.length() > 0;
 525         }
 526
 527         /// read subsequent bibtex values that are delimited with a #-character.
 528         /// Concatenate all parts and replace names with the associated string in
 529         /// the variable strings.
 530         /// @return true if reading was successfull (all single parts were delimited
 531         /// correctly)
 532         bool readValue(docstring & val, ifdocstream & ifs, const VarMap & strings) {
 533
 534                 char_type ch;
 535
 536                 val.clear();
 537
 538                 if (!ifs)
 539                         return false;
 540
 541                 do {
 542                         // skip whitespace
 543                         do {
 544                                 ifs.get(ch);
 545                         } while (ifs && isSpace(ch));
 546
 547                         if (!ifs)
 548                                 return false;
 549
 550                         // check for field type
 551                         if (isDigit(ch)) {
 552
 553                                 // read integer value
 554                                 do {
 555                                         val += ch;
 556                                         ifs.get(ch);
 557                                 } while (ifs && isDigit(ch));
 558
 559                                 if (!ifs)
 560                                         return false;
 561
 562                         } else if (ch == '"' || ch == '{') {
 563                                 // set end delimiter
 564                                 char_type delim = ch == '"' ? '"': '}';
 565
 566                                 // Skip whitespace
 567                                 do {
 568                                         ifs.get(ch);
 569                                 } while (ifs && isSpace(ch));
 570
 571                                 if (!ifs)
 572                                         return false;
 573
 574                                 // We now have the first non-whitespace character
 575                                 // We'll collapse adjacent whitespace.
 576                                 bool lastWasWhiteSpace = false;
 577
 578                                 // inside this delimited text braces must match.
 579                                 // Thus we can have a closing delimiter only
 580                                 // when nestLevel == 0
 581                                 int nestLevel = 0;
 582
 583                                 while (ifs && (nestLevel > 0 || ch != delim)) {
 584                                         if (isSpace(ch)) {
 585                                                 lastWasWhiteSpace = true;
 586                                                 ifs.get(ch);
 587                                                 continue;
 588                                         }
 589                                         // We output the space only after we stop getting
 590                                         // whitespace so as not to output any whitespace
 591                                         // at the end of the value.
 592                                         if (lastWasWhiteSpace) {
 593                                                 lastWasWhiteSpace = false;
 594                                                 val += ' ';
 595                                         }
 596
 597                                         val += ch;
 598
 599                                         // update nesting level
 600                                         switch (ch) {
 601                                                 case '{':
 602                                                         ++nestLevel;
 603                                                         break;
 604                                                 case '}':
 605                                                         --nestLevel;
 606                                                         if (nestLevel < 0) return false;
 607                                                         break;
 608                                         }
 609
 610                                         ifs.get(ch);
 611                                 }
 612
 613                                 if (!ifs)
 614                                         return false;
 615
 616                                 ifs.get(ch);
 617
 618                                 if (!ifs)
 619                                         return false;
 620
 621                         } else {
 622
 623                                 // reading a string name
 624                                 docstring strName;
 625
 626                                 while (ifs && !isSpace(ch) && ch != '#' && ch != ',' && ch != '}' && ch != ')') {
 627                                         strName += lowercase(ch);
 628                                         ifs.get(ch);
 629                                 }
 630
 631                                 if (!ifs)
 632                                         return false;
 633
 634                                 // replace the string with its assigned value or
 635                                 // discard it if it's not assigned
 636                                 if (strName.length()) {
 637                                         VarMap::const_iterator pos = strings.find(strName);
 638                                         if (pos != strings.end()) {
 639                                                 val += pos->second;
 640                                         }
 641                                 }
 642                         }
 643
 644                         // skip WS
 645                         while (ifs && isSpace(ch)) {
 646                                 ifs.get(ch);
 647                         }
 648
 649                         if (!ifs)
 650                                 return false;
 651
 652                         // continue reading next value on concatenate with '#'
 653                 } while (ch == '#');
 654
 655                 ifs.putback(ch);
 656
 657                 return true;
 658         }
 659 }
 660
 661
 662 // This method returns a comma separated list of Bibtex entries
 663 void InsetBibtex::fillWithBibKeys(BiblioInfo & keylist,
 664         InsetIterator const & /*di*/) const
 665 {
 666         // This bibtex parser is a first step to parse bibtex files
 667         // more precisely.
 668         //
 669         // - it reads the whole bibtex entry and does a syntax check
 670         //   (matching delimiters, missing commas,...
 671         // - it recovers from errors starting with the next @-character
 672         // - it reads @string definitions and replaces them in the
 673         //   field values.
 674         // - it accepts more characters in keys or value names than
 675         //   bibtex does.
 676         //
 677         // Officially bibtex does only support ASCII, but in practice
 678         // you can use the encoding of the main document as long as
 679         // some elements like keys and names are pure ASCII. Therefore
 680         // we convert the file from the buffer encoding.
 681         // We don't restrict keys to ASCII in LyX, since our own
 682         // InsetBibitem can generate non-ASCII keys, and nonstandard
 683         // 8bit clean bibtex forks exist.
 684         support::FileNameList const files = getBibFiles();
 685         support::FileNameList::const_iterator it = files.begin();
 686         support::FileNameList::const_iterator en = files.end();
 687         for (; it != en; ++ it) {
 688                 ifdocstream ifs(it->toFilesystemEncoding().c_str(),
 689                         ios_base::in, buffer().params().encoding().iconvName());
 690
 691                 char_type ch;
 692                 VarMap strings;
 693
 694                 while (ifs) {
 695
 696                         ifs.get(ch);
 697                         if (!ifs)
 698                                 break;
 699
 700                         if (ch != '@')
 701                                 continue;
 702
 703                         docstring entryType;
 704
 705                         if (!readTypeOrKey(entryType, ifs, from_ascii("{("), docstring(), makeLowerCase)) {
 706                                 lyxerr << "InsetBibtex::fillWithBibKeys: Error reading entry type." << std::endl;
 707                                 continue;
 708                         }
 709
 710                         if (!ifs) {
 711                                 lyxerr << "InsetBibtex::fillWithBibKeys: Unexpected end of file." << std::endl;
 712                                 continue;
 713                         }
 714
 715                         if (entryType == from_ascii("comment")) {
 716                                 ifs.ignore(numeric_limits<int>::max(), '\n');
 717                                 continue;
 718                         }
 719
 720                         ifs.get(ch);
 721                         if (!ifs) {
 722                                 lyxerr << "InsetBibtex::fillWithBibKeys: Unexpected end of file." << std::endl;
 723                                 break;
 724                         }
 725
 726                         if ((ch != '(') && (ch != '{')) {
 727                                 lyxerr << "InsetBibtex::fillWithBibKeys: Invalid entry delimiter." << std::endl;
 728                                 ifs.putback(ch);
 729                                 continue;
 730                         }
 731
 732                         // process the entry
 733                         if (entryType == from_ascii("string")) {
 734
 735                                 // read string and add it to the strings map
 736                                 // (or replace it's old value)
 737                                 docstring name;
 738                                 docstring value;
 739
 740                                 if (!readTypeOrKey(name, ifs, from_ascii("="), from_ascii("#{}(),"), makeLowerCase)) {
 741                                         lyxerr << "InsetBibtex::fillWithBibKeys: Error reading string name." << std::endl;
 742                                         continue;
 743                                 }
 744
 745                                 if (!ifs) {
 746                                         lyxerr << "InsetBibtex::fillWithBibKeys: Unexpected end of file." << std::endl;
 747                                         continue;
 748                                 }
 749
 750                                 // next char must be an equal sign
 751                                 ifs.get(ch);
 752                                 if (!ifs || ch != '=') {
 753                                         lyxerr << "InsetBibtex::fillWithBibKeys: No `=' after string name: " <<
 754                                                         name << "." << std::endl;
 755                                         continue;
 756                                 }
 757
 758                                 if (!readValue(value, ifs, strings)) {
 759                                         lyxerr << "InsetBibtex::fillWithBibKeys: Unable to read value for string: " <<
 760                                                         name << "." << std::endl;
 761                                         continue;
 762                                 }
 763
 764                                 strings[name] = value;
 765
 766                         } else if (entryType == from_ascii("preamble")) {
 767
 768                                 // preamble definitions are discarded.
 769                                 // can they be of any use in lyx?
 770                                 docstring value;
 771
 772                                 if (!readValue(value, ifs, strings)) {
 773                                         lyxerr << "InsetBibtex::fillWithBibKeys: Unable to read preamble value." << std::endl;
 774                                         continue;
 775                                 }
 776
 777                         } else {
 778
 779                                 // Citation entry. Try to read the key.
 780                                 docstring key;
 781
 782                                 if (!readTypeOrKey(key, ifs, from_ascii(","), from_ascii("}"), keepCase)) {
 783                                         lyxerr << "InsetBibtex::fillWithBibKeys: Unable to read key for entry type:" <<
 784                                                         entryType << "." << std::endl;
 785                                         continue;
 786                                 }
 787
 788                                 if (!ifs) {
 789                                         lyxerr << "InsetBibtex::fillWithBibKeys: Unexpected end of file." << std::endl;
 790                                         continue;
 791                                 }
 792
 793                                 /////////////////////////////////////////////
 794                                 // now we have a key, so we will add an entry
 795                                 // (even if it's empty, as bibtex does)
 796                                 //
 797                                 // we now read the field = value pairs.
 798                                 // all items must be separated by a comma. If
 799                                 // it is missing the scanning of this entry is
 800                                 // stopped and the next is searched.
 801                                 docstring fields;
 802                                 docstring name;
 803                                 docstring value;
 804                                 docstring commaNewline;
 805                                 docstring data;
 806                                 BibTeXInfo keyvalmap(key, entryType);
 807
 808                                 bool readNext = removeWSAndComma(ifs);
 809
 810                                 while (ifs && readNext) {
 811
 812                                         // read field name
 813                                         if (!readTypeOrKey(name, ifs, from_ascii("="),
 814                                                            from_ascii("{}(),"), makeLowerCase) || !ifs)
 815                                                 break;
 816
 817                                         // next char must be an equal sign
 818                                         ifs.get(ch);
 819                                         if (!ifs) {
 820                                                 lyxerr << "InsetBibtex::fillWithBibKeys: Unexpected end of file." << std::endl;
 821                                                 break;
 822                                         }
 823                                         if (ch != '=') {
 824                                                 lyxerr << "InsetBibtex::fillWithBibKeys: Missing `=' after field name: " <<
 825                                                                 name << ", for key: " << key << "." << std::endl;
 826                                                 ifs.putback(ch);
 827                                                 break;
 828                                         }
 829
 830                                         // read field value
 831                                         if (!readValue(value, ifs, strings)) {
 832                                                 lyxerr << "InsetBibtex::fillWithBibKeys: Unable to read value for field: " <<
 833                                                                 name << ", for key: " << key << "." << std::endl;
 834                                                 break;
 835                                         }
 836
 837                                         keyvalmap[name] = value;
 838                                         data += "\n\n" + value;
 839                                         keylist.addFieldName(name);
 840                                         readNext = removeWSAndComma(ifs);
 841                                 }
 842
 843                                 // add the new entry
 844                                 keylist.addEntryType(entryType);
 845                                 keyvalmap.setAllData(data);
 846                                 keylist[key] = keyvalmap;
 847                         } //< else (citation entry)
 848                 } //< searching '@'
 849         } //< for loop over files
 850 }
 851
 852
 853 FileName InsetBibtex::getBibTeXPath(docstring const & filename, Buffer const & buf)
 854 {
 855         string texfile = changeExtension(to_utf8(filename), "bib");
 856         // note that, if the filename can be found directly from the path,
 857         // findtexfile will just return a FileName object for that path.
 858         FileName file(findtexfile(texfile, "bib"));
 859         if (file.empty())
 860                 file = FileName(makeAbsPath(texfile, buf.filePath()));
 861         return file;
 862 }
 863
 864
 865 bool InsetBibtex::addDatabase(docstring const & db)
 866 {
 867         docstring bibfiles = getParam("bibfiles");
 868         if (tokenPos(bibfiles, ',', db) != -1)
 869                 return false;
 870         if (!bibfiles.empty())
 871                 bibfiles += ',';
 872         setParam("bibfiles", bibfiles + db);
 873         return true;
 874 }
 875
 876
 877 bool InsetBibtex::delDatabase(docstring const & db)
 878 {
 879         docstring bibfiles = getParam("bibfiles");
 880         if (contains(bibfiles, db)) {
 881                 int const n = tokenPos(bibfiles, ',', db);
 882                 docstring bd = db;
 883                 if (n > 0) {
 884                         // this is not the first database
 885                         docstring tmp = ',' + bd;
 886                         setParam("bibfiles", subst(bibfiles, tmp, docstring()));
 887                 } else if (n == 0)
 888                         // this is the first (or only) database
 889                         setParam("bibfiles", split(bibfiles, bd, ','));
 890                 else
 891                         return false;
 892         }
 893         return true;
 894 }
 895
 896
 897 void InsetBibtex::validate(LaTeXFeatures & features) const
 898 {
 899         if (features.bufferParams().use_bibtopic)
 900                 features.require("bibtopic");
 901 }
 902
 903
 904 docstring InsetBibtex::contextMenu(BufferView const &, int, int) const
 905 {
 906         return from_ascii("context-bibtex");
 907 }
 908
 909
 910 } // namespace lyx