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