src/tex2lyx/preamble.cpp

   1 /**
   2  * \file preamble.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author André Pönitz
   7  * \author Uwe Stöhr
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 // {[(
  13
  14 #include <config.h>
  15
  16 #include "tex2lyx.h"
  17
  18 #include "Layout.h"
  19 #include "Lexer.h"
  20 #include "TextClass.h"
  21 #include "support/convert.h"
  22 #include "support/filetools.h"
  23 #include "support/lstrings.h"
  24
  25 #include <algorithm>
  26 #include <iostream>
  27 #include <sstream>
  28 #include <string>
  29 #include <vector>
  30 #include <map>
  31
  32 using namespace std;
  33
  34 namespace lyx {
  35
  36 using support::FileName;
  37 using support::libFileSearch;
  38 using support::isStrDbl;
  39
  40 // special columntypes
  41 extern std::map<char, int> special_columns;
  42
  43 std::map<string, vector<string> > used_packages;
  44
  45 // needed to handle encodings with babel
  46 bool one_language = true;
  47
  48 // to avoid that the babel options overwrite the documentclass options
  49 bool documentclass_language;
  50
  51 namespace {
  52
  53 const char * const known_languages[] = { "afrikaans", "american", "arabic",
  54 "austrian", "bahasa", "basque", "belarusian", "brazil", "breton", "british",
  55 "bulgarian", "canadian", "canadien", "catalan", "croatian", "czech", "danish",
  56 "dutch", "english", "esperanto", "estonian", "finnish", "francais", "french",
  57 "frenchb", "frenchle", "frenchpro", "galician", "german", "germanb", "greek",
  58 "hebrew", "icelandic", "irish", "italian", "lsorbian", "magyar", "naustrian",
  59 "ngerman", "ngermanb", "norsk", "nynorsk", "polish", "portuges", "romanian",
  60 "russian", "russianb", "scottish", "serbian", "slovak", "slovene", "spanish",
  61 "swedish", "thai", "turkish", "ukraineb", "ukrainian", "usorbian", "welsh", 0};
  62
  63 //note this when updating to lyxformat 305:
  64 //bahasai, indonesian, and indon = equal to bahasa
  65 //malay, and meyalu = equal to bahasam
  66
  67 const char * const known_french_languages[] = {"french", "frenchb", "francais",
  68                                                 "frenchle", "frenchpro", 0};
  69 const char * const known_german_languages[] = {"german", "germanb", 0};
  70 const char * const known_ngerman_languages[] = {"ngerman", "ngermanb", 0};
  71 const char * const known_russian_languages[] = {"russian", "russianb", 0};
  72 const char * const known_ukrainian_languages[] = {"ukrainian", "ukraineb", 0};
  73
  74 char const * const known_fontsizes[] = { "10pt", "11pt", "12pt", 0 };
  75
  76 const char * const known_roman_fonts[] = { "ae", "bookman", "charter",
  77 "cmr", "fourier", "lmodern", "mathpazo", "mathptmx", "newcent", 0};
  78
  79 const char * const known_sans_fonts[] = { "avant", "berasans", "cmbr", "cmss",
  80 "helvet", "lmss", 0};
  81
  82 const char * const known_typewriter_fonts[] = { "beramono", "cmtl", "cmtt",
  83 "courier", "lmtt", "luximono", "fourier", "lmodern", "mathpazo", "mathptmx",
  84 "newcent", 0};
  85
  86 // some ugly stuff
  87 ostringstream h_preamble;
  88 string h_textclass               = "article";
  89 string h_options                 = string();
  90 string h_language                = "english";
  91 string h_inputencoding           = "auto";
  92 string h_font_roman              = "default";
  93 string h_font_sans               = "default";
  94 string h_font_typewriter         = "default";
  95 string h_font_default_family     = "default";
  96 string h_font_sc                 = "false";
  97 string h_font_osf                = "false";
  98 string h_font_sf_scale           = "100";
  99 string h_font_tt_scale           = "100";
 100 string h_graphics                = "default";
 101 string h_paperfontsize           = "default";
 102 string h_spacing                 = "single";
 103 string h_papersize               = "default";
 104 string h_use_geometry            = "false";
 105 string h_use_amsmath             = "0";
 106 string h_cite_engine             = "basic";
 107 string h_use_bibtopic            = "false";
 108 string h_paperorientation        = "portrait";
 109 string h_secnumdepth             = "3";
 110 string h_tocdepth                = "3";
 111 string h_paragraph_separation    = "indent";
 112 string h_defskip                 = "medskip";
 113 string h_quotes_language         = "english";
 114 string h_papercolumns            = "1";
 115 string h_papersides              = string();
 116 string h_paperpagestyle          = "default";
 117 string h_tracking_changes        = "false";
 118 string h_output_changes          = "false";
 119
 120
 121 void handle_opt(vector<string> & opts, char const * const * what, string & target)
 122 {
 123         if (opts.empty())
 124                 return;
 125
 126         // the last language option is the document language (for babel and LyX)
 127         // the last size option is the document font size
 128         vector<string>::iterator it;
 129         vector<string>::iterator position = opts.begin();
 130         for (; *what; ++what) {
 131                 it = find(opts.begin(), opts.end(), *what);
 132                 if (it != opts.end()) {
 133                         documentclass_language = true;
 134                         if (it >= position) {
 135                                 target = *what;
 136                                 position = it;
 137                         }
 138                 }
 139         }
 140 }
 141
 142
 143 void delete_opt(vector<string> & opts, char const * const * what)
 144 {
 145         if (opts.empty())
 146                 return;
 147
 148         // remove found options from the list
 149         // do this after handle_opt to avoid potential memory leaks and to be able
 150         // to find in every case the last language option
 151         vector<string>::iterator it;
 152         for (; *what; ++what) {
 153                 it = find(opts.begin(), opts.end(), *what);
 154                 if (it != opts.end())
 155                         opts.erase(it);
 156         }
 157 }
 158
 159
 160 /*!
 161  * Split a package options string (keyval format) into a vector.
 162  * Example input:
 163  *   authorformat=smallcaps,
 164  *   commabeforerest,
 165  *   titleformat=colonsep,
 166  *   bibformat={tabular,ibidem,numbered}
 167  */
 168 vector<string> split_options(string const & input)
 169 {
 170         vector<string> options;
 171         string option;
 172         Parser p(input);
 173         while (p.good()) {
 174                 Token const & t = p.get_token();
 175                 if (t.asInput() == ",") {
 176                         options.push_back(trim(option));
 177                         option.erase();
 178                 } else if (t.asInput() == "=") {
 179                         option += '=';
 180                         p.skip_spaces(true);
 181                         if (p.next_token().asInput() == "{")
 182                                 option += '{' + p.getArg('{', '}') + '}';
 183                 } else if (t.cat() != catSpace)
 184                         option += t.asInput();
 185         }
 186
 187         if (!option.empty())
 188                 options.push_back(trim(option));
 189
 190         return options;
 191 }
 192
 193
 194 /*!
 195  * Add package \p name with options \p options to used_packages.
 196  * Remove options from \p options that we don't want to output.
 197  */
 198 void add_package(string const & name, vector<string> & options)
 199 {
 200         // every package inherits the global options
 201         if (used_packages.find(name) == used_packages.end())
 202                 used_packages[name] = split_options(h_options);
 203
 204         vector<string> & v = used_packages[name];
 205         v.insert(v.end(), options.begin(), options.end());
 206         if (name == "jurabib") {
 207                 // Don't output the order argument (see the cite command
 208                 // handling code in text.cpp).
 209                 vector<string>::iterator end =
 210                         remove(options.begin(), options.end(), "natbiborder");
 211                 end = remove(options.begin(), end, "jurabiborder");
 212                 options.erase(end, options.end());
 213         }
 214 }
 215
 216
 217 // Given is a string like "scaled=0.9", return 0.9 * 100
 218 string const scale_as_percentage(string const & scale)
 219 {
 220         string::size_type pos = scale.find('=');
 221         if (pos != string::npos) {
 222                 string value = scale.substr(pos + 1);
 223                 if (isStrDbl(value))
 224                         return convert<string>(100 * convert<double>(value));
 225         }
 226         // If the input string didn't match our expectations.
 227         // return the default value "100"
 228         return "100";
 229 }
 230
 231
 232 void handle_package(string const & name, string const & opts)
 233 {
 234         vector<string> options = split_options(opts);
 235         add_package(name, options);
 236         string scale;
 237
 238         // roman fonts
 239         if (is_known(name, known_roman_fonts))
 240                 h_font_roman = name;
 241         if (name == "fourier") {
 242                 h_font_roman = "utopia";
 243                 // when font uses real small capitals
 244                 if (opts == "expert")
 245                         h_font_sc = "true";
 246         }
 247         if (name == "mathpazo")
 248                 h_font_roman = "palatino";
 249         if (name == "mathptmx")
 250                 h_font_roman = "times";
 251         // sansserif fonts
 252         if (is_known(name, known_sans_fonts)) {
 253                 h_font_sans = name;
 254                 if (!opts.empty()) {
 255                         scale = opts;
 256                         h_font_sf_scale = scale_as_percentage(scale);
 257                 }
 258         }
 259         // typewriter fonts
 260         if (is_known(name, known_typewriter_fonts)) {
 261                 h_font_typewriter = name;
 262                 if (!opts.empty()) {
 263                         scale = opts;
 264                         h_font_tt_scale = scale_as_percentage(scale);
 265                 }
 266         }
 267         // font uses old-style figure
 268         if (name == "eco")
 269                 h_font_osf = "true";
 270
 271         else if (name == "amsmath" || name == "amssymb")
 272                 h_use_amsmath = "1";
 273         else if (name == "babel" && !opts.empty()) {
 274                 // check if more than one option was used - used later for inputenc
 275                 // in case inputenc is parsed before babel, set the encoding to auto
 276                 if (options.begin() != options.end() - 1) {
 277                         one_language = false;
 278                         h_inputencoding = "auto";
 279                 }
 280                 // only set the document language when there was not already one set
 281                 // via the documentclass options
 282                 // babel takes the the last language given in the documentclass options
 283                 // as document language. If there is no such language option, the last
 284                 // option of its \usepackage call is used.
 285                 if (documentclass_language == false) {
 286                         handle_opt(options, known_languages, h_language);
 287                         delete_opt(options, known_languages);
 288                         if (is_known(h_language, known_french_languages))
 289                                 h_language = "french";
 290                         else if (is_known(h_language, known_german_languages))
 291                                 h_language = "german";
 292                         else if (is_known(h_language, known_ngerman_languages))
 293                                 h_language = "ngerman";
 294                         else if (is_known(h_language, known_russian_languages))
 295                                 h_language = "russian";
 296                         else if (is_known(h_language, known_ukrainian_languages))
 297                                 h_language = "ukrainian";
 298                         h_quotes_language = h_language;
 299                 }
 300         }
 301         else if (name == "fontenc")
 302                 ; // ignore this
 303         else if (name == "inputenc") {
 304                 // only set when there is not more than one inputenc option
 305                 // therefore check for the "," character
 306                 // also only set when there is not more then one babel language option
 307                 if (opts.find(",") == string::npos && one_language == true)
 308                         h_inputencoding = opts;
 309                 options.clear();
 310         } else if (name == "makeidx")
 311                 ; // ignore this
 312         else if (name == "verbatim")
 313                 ; // ignore this
 314         else if (name == "graphicx")
 315                 ; // ignore this
 316         else if (is_known(name, known_languages)) {
 317                 if (is_known(name, known_french_languages))
 318                         h_language = "french";
 319                 else if (is_known(name, known_german_languages))
 320                         h_language = "german";
 321                 else if (is_known(name, known_ngerman_languages))
 322                         h_language = "ngerman";
 323                 else if (is_known(name, known_russian_languages))
 324                         h_language = "russian";
 325                 else if (is_known(name, known_ukrainian_languages))
 326                         h_language = "ukrainian";
 327                 else
 328                         h_language = name;
 329                 h_quotes_language = h_language;
 330
 331         } else if (name == "natbib") {
 332                 h_cite_engine = "natbib_authoryear";
 333                 vector<string>::iterator it =
 334                         find(options.begin(), options.end(), "authoryear");
 335                 if (it != options.end())
 336                         options.erase(it);
 337                 else {
 338                         it = find(options.begin(), options.end(), "numbers");
 339                         if (it != options.end()) {
 340                                 h_cite_engine = "natbib_numerical";
 341                                 options.erase(it);
 342                         }
 343                 }
 344         } else if (name == "jurabib") {
 345                 h_cite_engine = "jurabib";
 346         } else if (options.empty())
 347                 h_preamble << "\\usepackage{" << name << "}\n";
 348         else {
 349                 h_preamble << "\\usepackage[" << opts << "]{" << name << "}\n";
 350                 options.clear();
 351         }
 352
 353         // We need to do something with the options...
 354         if (!options.empty())
 355                 cerr << "Ignoring options '" << join(options, ",")
 356                      << "' of package " << name << '.' << endl;
 357 }
 358
 359
 360
 361 void end_preamble(ostream & os, TextClass const & /*textclass*/)
 362 {
 363         os << "#LyX file created by tex2lyx " << PACKAGE_VERSION << "\n"
 364            << "\\lyxformat 247\n"
 365            << "\\begin_document\n"
 366            << "\\begin_header\n"
 367            << "\\textclass " << h_textclass << "\n";
 368         if (!h_preamble.str().empty())
 369                 os << "\\begin_preamble\n" << h_preamble.str() << "\n\\end_preamble\n";
 370         if (!h_options.empty())
 371                 os << "\\options " << h_options << "\n";
 372         os << "\\language " << h_language << "\n"
 373            << "\\inputencoding " << h_inputencoding << "\n"
 374            << "\\font_roman " << h_font_roman << "\n"
 375            << "\\font_sans " << h_font_sans << "\n"
 376            << "\\font_typewriter " << h_font_typewriter << "\n"
 377            << "\\font_default_family " << h_font_default_family << "\n"
 378            << "\\font_sc " << h_font_sc << "\n"
 379            << "\\font_osf " << h_font_osf << "\n"
 380            << "\\font_sf_scale " << h_font_sf_scale << "\n"
 381            << "\\font_tt_scale " << h_font_tt_scale << "\n"
 382            << "\\graphics " << h_graphics << "\n"
 383            << "\\paperfontsize " << h_paperfontsize << "\n"
 384            << "\\spacing " << h_spacing << "\n"
 385            << "\\papersize " << h_papersize << "\n"
 386            << "\\use_geometry " << h_use_geometry << "\n"
 387            << "\\use_amsmath " << h_use_amsmath << "\n"
 388            << "\\cite_engine " << h_cite_engine << "\n"
 389            << "\\use_bibtopic " << h_use_bibtopic << "\n"
 390            << "\\paperorientation " << h_paperorientation << "\n"
 391            << "\\secnumdepth " << h_secnumdepth << "\n"
 392            << "\\tocdepth " << h_tocdepth << "\n"
 393            << "\\paragraph_separation " << h_paragraph_separation << "\n"
 394            << "\\defskip " << h_defskip << "\n"
 395            << "\\quotes_language " << h_quotes_language << "\n"
 396            << "\\papercolumns " << h_papercolumns << "\n"
 397            << "\\papersides " << h_papersides << "\n"
 398            << "\\paperpagestyle " << h_paperpagestyle << "\n"
 399            << "\\tracking_changes " << h_tracking_changes << "\n"
 400            << "\\output_changes " << h_output_changes << "\n"
 401            << "\\end_header\n\n"
 402            << "\\begin_body\n";
 403         // clear preamble for subdocuments
 404         h_preamble.str("");
 405 }
 406
 407 } // anonymous namespace
 408
 409 TextClass const parse_preamble(Parser & p, ostream & os, string const & forceclass)
 410 {
 411         // initialize fixed types
 412         special_columns['D'] = 3;
 413         bool is_full_document = false;
 414
 415         // determine whether this is a full document or a fragment for inclusion
 416         while (p.good()) {
 417                 Token const & t = p.get_token();
 418
 419                 if (t.cat() == catEscape && t.cs() == "documentclass") {
 420                         is_full_document = true;
 421                         break;
 422                 }
 423         }
 424         p.reset();
 425
 426         while (is_full_document && p.good()) {
 427                 Token const & t = p.get_token();
 428
 429 #ifdef FILEDEBUG
 430                 cerr << "t: " << t << "\n";
 431 #endif
 432
 433                 //
 434                 // cat codes
 435                 //
 436                 if (t.cat() == catLetter ||
 437                           t.cat() == catSuper ||
 438                           t.cat() == catSub ||
 439                           t.cat() == catOther ||
 440                           t.cat() == catMath ||
 441                           t.cat() == catActive ||
 442                           t.cat() == catBegin ||
 443                           t.cat() == catEnd ||
 444                           t.cat() == catAlign ||
 445                           t.cat() == catParameter)
 446                 h_preamble << t.character();
 447
 448                 else if (t.cat() == catSpace || t.cat() == catNewline)
 449                         h_preamble << t.asInput();
 450
 451                 else if (t.cat() == catComment)
 452                         h_preamble << t.asInput();
 453
 454                 else if (t.cs() == "pagestyle")
 455                         h_paperpagestyle = p.verbatim_item();
 456
 457                 else if (t.cs() == "makeatletter") {
 458                         p.setCatCode('@', catLetter);
 459                 }
 460
 461                 else if (t.cs() == "makeatother") {
 462                         p.setCatCode('@', catOther);
 463                 }
 464
 465                 else if (t.cs() == "newcommand" || t.cs() == "renewcommand"
 466                             || t.cs() == "providecommand") {
 467                         bool star = false;
 468                         if (p.next_token().character() == '*') {
 469                                 p.get_token();
 470                                 star = true;
 471                         }
 472                         string const name = p.verbatim_item();
 473                         string const opt1 = p.getOpt();
 474                         string const opt2 = p.getFullOpt();
 475                         string const body = p.verbatim_item();
 476                         // font settings
 477                         if (name == "\\rmdefault")
 478                                 if (is_known(body, known_roman_fonts))
 479                                         h_font_roman = body;
 480
 481                         if (name == "\\sfdefault")
 482                                 if (is_known(body, known_sans_fonts))
 483                                         h_font_sans = body;
 484
 485                         if (name == "\\ttdefault")
 486                                 if (is_known(body, known_typewriter_fonts))
 487                                         h_font_typewriter = body;
 488
 489                         if (name == "\\familydefault") {
 490                                 string family = body;
 491                                 // remove leading "\"
 492                                 h_font_default_family = family.erase(0,1);
 493                         }
 494                         // only non-lyxspecific stuff
 495                         if (   name != "\\noun"
 496                             && name != "\\tabularnewline"
 497                             && name != "\\LyX"
 498                             && name != "\\lyxline"
 499                             && name != "\\lyxaddress"
 500                             && name != "\\lyxrightaddress"
 501                             && name != "\\lyxdot"
 502                             && name != "\\boldsymbol"
 503                             && name != "\\lyxarrow"
 504                             && name != "\\rmdefault"
 505                             && name != "\\sfdefault"
 506                             && name != "\\ttdefault"
 507                             && name != "\\familydefault") {
 508                                 ostringstream ss;
 509                                 ss << '\\' << t.cs();
 510                                 if (star)
 511                                         ss << '*';
 512                                 ss << '{' << name << '}' << opt1 << opt2
 513                                    << '{' << body << "}";
 514                                 h_preamble << ss.str();
 515
 516                                 // Add the command to the known commands
 517                                 add_known_command(name, opt1, !opt2.empty());
 518 /*
 519                                 ostream & out = in_preamble ? h_preamble : os;
 520                                 out << "\\" << t.cs() << "{" << name << "}"
 521                                     << opts << "{" << body << "}";
 522 */
 523                         }
 524                 }
 525
 526                 else if (t.cs() == "documentclass") {
 527                         vector<string> opts = split_options(p.getArg('[', ']'));
 528                         handle_opt(opts, known_fontsizes, h_paperfontsize);
 529                         delete_opt(opts, known_fontsizes);
 530                         // delete "pt" at the end
 531                         string::size_type i = h_paperfontsize.find("pt");
 532                         if (i != string::npos)
 533                                 h_paperfontsize.erase(i);
 534                         // to avoid that the babel options overwrite the documentclass options
 535                         documentclass_language = false;
 536                         handle_opt(opts, known_languages, h_language);
 537                         delete_opt(opts, known_languages);
 538                         if (is_known(h_language, known_french_languages))
 539                                 h_language = "french";
 540                         else if (is_known(h_language, known_german_languages))
 541                                 h_language = "german";
 542                         else if (is_known(h_language, known_ngerman_languages))
 543                                 h_language = "ngerman";
 544                         else if (is_known(h_language, known_russian_languages))
 545                                 h_language = "russian";
 546                         else if (is_known(h_language, known_ukrainian_languages))
 547                                 h_language = "ukrainian";
 548                         h_quotes_language = h_language;
 549                         h_options = join(opts, ",");
 550                         h_textclass = p.getArg('{', '}');
 551                 }
 552
 553                 else if (t.cs() == "usepackage") {
 554                         string const options = p.getArg('[', ']');
 555                         string const name = p.getArg('{', '}');
 556                         if (options.empty() && name.find(',')) {
 557                                 vector<string> vecnames;
 558                                 split(name, vecnames, ',');
 559                                 vector<string>::const_iterator it  = vecnames.begin();
 560                                 vector<string>::const_iterator end = vecnames.end();
 561                                 for (; it != end; ++it)
 562                                         handle_package(trim(*it), string());
 563                         } else {
 564                                 handle_package(name, options);
 565                         }
 566                 }
 567
 568                 else if (t.cs() == "newenvironment") {
 569                         string const name = p.getArg('{', '}');
 570                         ostringstream ss;
 571                         ss << "\\newenvironment{" << name << "}";
 572                         ss << p.getOpt();
 573                         ss << p.getOpt();
 574                         ss << '{' << p.verbatim_item() << '}';
 575                         ss << '{' << p.verbatim_item() << '}';
 576                         if (name != "lyxcode" && name != "lyxlist" &&
 577                             name != "lyxrightadress" &&
 578                             name != "lyxaddress" && name != "lyxgreyedout")
 579                                 h_preamble << ss.str();
 580                 }
 581
 582                 else if (t.cs() == "def") {
 583                         string name = p.get_token().cs();
 584                         while (p.next_token().cat() != catBegin)
 585                                 name += p.get_token().asString();
 586                         h_preamble << "\\def\\" << name << '{'
 587                                    << p.verbatim_item() << "}";
 588                 }
 589
 590                 else if (t.cs() == "newcolumntype") {
 591                         string const name = p.getArg('{', '}');
 592                         trim(name);
 593                         int nargs = 0;
 594                         string opts = p.getOpt();
 595                         if (!opts.empty()) {
 596                                 istringstream is(string(opts, 1));
 597                                 is >> nargs;
 598                         }
 599                         special_columns[name[0]] = nargs;
 600                         h_preamble << "\\newcolumntype{" << name << "}";
 601                         if (nargs)
 602                                 h_preamble << "[" << nargs << "]";
 603                         h_preamble << "{" << p.verbatim_item() << "}";
 604                 }
 605
 606                 else if (t.cs() == "setcounter") {
 607                         string const name = p.getArg('{', '}');
 608                         string const content = p.getArg('{', '}');
 609                         if (name == "secnumdepth")
 610                                 h_secnumdepth = content;
 611                         else if (name == "tocdepth")
 612                                 h_tocdepth = content;
 613                         else
 614                                 h_preamble << "\\setcounter{" << name << "}{" << content << "}";
 615                 }
 616
 617                 else if (t.cs() == "setlength") {
 618                         string const name = p.verbatim_item();
 619                         string const content = p.verbatim_item();
 620                         // Is this correct?
 621                         if (name == "parskip")
 622                                 h_paragraph_separation = "skip";
 623                         else if (name == "parindent")
 624                                 h_paragraph_separation = "skip";
 625                         else
 626                                 h_preamble << "\\setlength{" << name << "}{" << content << "}";
 627                 }
 628
 629                 else if (t.cs() == "begin") {
 630                         string const name = p.getArg('{', '}');
 631                         if (name == "document")
 632                                 break;
 633                         h_preamble << "\\begin{" << name << "}";
 634                 }
 635
 636                 else if (t.cs() == "jurabibsetup") {
 637                         vector<string> jurabibsetup =
 638                                 split_options(p.getArg('{', '}'));
 639                         // add jurabibsetup to the jurabib package options
 640                         add_package("jurabib", jurabibsetup);
 641                         if (!jurabibsetup.empty()) {
 642                                 h_preamble << "\\jurabibsetup{"
 643                                            << join(jurabibsetup, ",") << '}';
 644                         }
 645                 }
 646
 647                 else if (!t.cs().empty())
 648                         h_preamble << '\\' << t.cs();
 649         }
 650         p.skip_spaces();
 651
 652         // Force textclass if the user wanted it
 653         if (!forceclass.empty())
 654                 h_textclass = forceclass;
 655         if (noweb_mode && !lyx::support::prefixIs(h_textclass, "literate-"))
 656                 h_textclass.insert(0, "literate-");
 657         FileName layoutfilename = libFileSearch("layouts", h_textclass, "layout");
 658         if (layoutfilename.empty()) {
 659                 cerr << "Error: Could not find layout file for textclass \"" << h_textclass << "\"." << endl;
 660                 exit(1);
 661         }
 662         TextClass textclass;
 663         textclass.read(layoutfilename);
 664         if (h_papersides.empty()) {
 665                 ostringstream ss;
 666                 ss << textclass.sides();
 667                 h_papersides = ss.str();
 668         }
 669         end_preamble(os, textclass);
 670         return textclass;
 671 }
 672
 673 // }])
 674
 675
 676 } // namespace lyx