src/output_latex.cpp

   1 /**
   2  * \file output_latex.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars Gullik Bjønnes
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "output_latex.h"
  14
  15 #include "Buffer.h"
  16 #include "BufferParams.h"
  17 #include "debug.h"
  18 #include "Encoding.h"
  19 #include "Language.h"
  20 #include "LyXRC.h"
  21 #include "OutputParams.h"
  22 #include "Paragraph.h"
  23 #include "paragraph_funcs.h"
  24 #include "ParagraphParameters.h"
  25 #include "TexRow.h"
  26 #include "VSpace.h"
  27
  28 #include "insets/InsetBibitem.h"
  29 #include "insets/InsetOptArg.h"
  30
  31 #include "support/lstrings.h"
  32
  33
  34 namespace lyx {
  35
  36 using support::subst;
  37
  38 using std::endl;
  39 using std::string;
  40 using std::pair;
  41 using std::make_pair;
  42
  43
  44 namespace {
  45
  46 ParagraphList::const_iterator
  47 TeXEnvironment(Buffer const & buf,
  48                ParagraphList const & paragraphs,
  49                ParagraphList::const_iterator pit,
  50                odocstream & os, TexRow & texrow,
  51                OutputParams const & runparams);
  52
  53 ParagraphList::const_iterator
  54 TeXOnePar(Buffer const & buf,
  55           ParagraphList const & paragraphs,
  56           ParagraphList::const_iterator pit,
  57           odocstream & os, TexRow & texrow,
  58           OutputParams const & runparams,
  59           string const & everypar = string());
  60
  61
  62 ParagraphList::const_iterator
  63 TeXDeeper(Buffer const & buf,
  64           ParagraphList const & paragraphs,
  65           ParagraphList::const_iterator pit,
  66           odocstream & os, TexRow & texrow,
  67           OutputParams const & runparams)
  68 {
  69         LYXERR(Debug::LATEX) << "TeXDeeper...     " << &*pit << endl;
  70         ParagraphList::const_iterator par = pit;
  71
  72         while (par != paragraphs.end() &&
  73                      par->params().depth() == pit->params().depth()) {
  74                 if (par->layout()->isEnvironment()) {
  75                         par = TeXEnvironment(buf, paragraphs, par,
  76                                              os, texrow, runparams);
  77                 } else {
  78                         par = TeXOnePar(buf, paragraphs, par,
  79                                              os, texrow, runparams);
  80                 }
  81         }
  82         LYXERR(Debug::LATEX) << "TeXDeeper...done " << endl;
  83
  84         return par;
  85 }
  86
  87
  88 ParagraphList::const_iterator
  89 TeXEnvironment(Buffer const & buf,
  90                ParagraphList const & paragraphs,
  91                ParagraphList::const_iterator pit,
  92                odocstream & os, TexRow & texrow,
  93                OutputParams const & runparams)
  94 {
  95         LYXERR(Debug::LATEX) << "TeXEnvironment...     " << &*pit << endl;
  96
  97         BufferParams const & bparams = buf.params();
  98
  99         Layout_ptr const & style = pit->layout();
 100
 101         Language const * const par_language = pit->getParLanguage(bparams);
 102         Language const * const doc_language = bparams.language;
 103         Language const * const prev_par_language =
 104                 (pit != paragraphs.begin())
 105                 ? boost::prior(pit)->getParLanguage(bparams)
 106                 : doc_language;
 107         if (par_language->babel() != prev_par_language->babel()) {
 108
 109                 if (!lyxrc.language_command_end.empty() &&
 110                     prev_par_language->babel() != doc_language->babel() &&
 111                     !prev_par_language->babel().empty()) {
 112                         os << from_ascii(subst(
 113                                 lyxrc.language_command_end,
 114                                 "$$lang",
 115                                 prev_par_language->babel()))
 116                            << '\n';
 117                         texrow.newline();
 118                 }
 119
 120                 if ((lyxrc.language_command_end.empty() ||
 121                      par_language->babel() != doc_language->babel()) &&
 122                     !par_language->babel().empty()) {
 123                         os << from_ascii(subst(
 124                                 lyxrc.language_command_begin,
 125                                 "$$lang",
 126                                 par_language->babel()))
 127                            << '\n';
 128                         texrow.newline();
 129                 }
 130         }
 131
 132         bool leftindent_open = false;
 133         if (!pit->params().leftIndent().zero()) {
 134                 os << "\\begin{LyXParagraphLeftIndent}{"
 135                    << from_ascii(pit->params().leftIndent().asLatexString())
 136                    << "}\n";
 137                 texrow.newline();
 138                 leftindent_open = true;
 139         }
 140
 141         if (style->isEnvironment()) {
 142                 os << "\\begin{" << from_ascii(style->latexname()) << '}';
 143                 if (style->optionalargs > 0) {
 144                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 145                                                     style->optionalargs);
 146                         while (ret > 0) {
 147                                 texrow.newline();
 148                                 --ret;
 149                         }
 150                 }
 151                 if (style->latextype == LATEX_LIST_ENVIRONMENT) {
 152                         os << '{'
 153                            << pit->params().labelWidthString()
 154                            << "}\n";
 155                 } else if (style->labeltype == LABEL_BIBLIO) {
 156                         // ale970405
 157                         os << '{' << bibitemWidest(buf) << "}\n";
 158                 } else
 159                         os << from_ascii(style->latexparam()) << '\n';
 160                 texrow.newline();
 161         }
 162         ParagraphList::const_iterator par = pit;
 163         do {
 164                 par = TeXOnePar(buf, paragraphs, par, os, texrow, runparams);
 165
 166                 if (par == paragraphs.end()) {
 167                         // Make sure that the last paragraph is
 168                         // correctly terminated (because TeXOnePar does
 169                         // not add a \n in this case)
 170                         os << '\n';
 171                         texrow.newline();
 172                 } else if (par->params().depth() > pit->params().depth()) {
 173                             if (par->layout()->isParagraph()) {
 174
 175                             // Thinko!
 176                             // How to handle this? (Lgb)
 177                             //&& !suffixIs(os, "\n\n")
 178                                     //) {
 179                                 // There should be at least one '\n' already
 180                                 // but we need there to be two for Standard
 181                                 // paragraphs that are depth-increment'ed to be
 182                                 // output correctly.  However, tables can
 183                                 // also be paragraphs so don't adjust them.
 184                                 // ARRae
 185                                 // Thinkee:
 186                                 // Will it ever harm to have one '\n' too
 187                                 // many? i.e. that we sometimes will have
 188                                 // three in a row. (Lgb)
 189                                 os << '\n';
 190                                 texrow.newline();
 191                         }
 192                         par = TeXDeeper(buf, paragraphs, par, os, texrow,
 193                                         runparams);
 194                 }
 195         } while (par != paragraphs.end()
 196                  && par->layout() == pit->layout()
 197                  && par->params().depth() == pit->params().depth()
 198                  && par->params().leftIndent() == pit->params().leftIndent());
 199
 200         if (style->isEnvironment()) {
 201                 os << "\\end{" << from_ascii(style->latexname()) << "}\n";
 202                 texrow.newline();
 203         }
 204
 205         if (leftindent_open) {
 206                 os << "\\end{LyXParagraphLeftIndent}\n";
 207                 texrow.newline();
 208         }
 209
 210         if (par != paragraphs.end())
 211                 LYXERR(Debug::LATEX) << "TeXEnvironment...done " << &*par << endl;
 212         return par;
 213 }
 214
 215 }
 216
 217
 218 int latexOptArgInsets(Buffer const & buf, Paragraph const & par,
 219                       odocstream & os, OutputParams const & runparams, int number)
 220 {
 221         int lines = 0;
 222
 223         InsetList::const_iterator it = par.insetlist.begin();
 224         InsetList::const_iterator end = par.insetlist.end();
 225         for (; it != end && number > 0 ; ++it) {
 226                 if (it->inset->lyxCode() == Inset::OPTARG_CODE) {
 227                         InsetOptArg * ins =
 228                                 static_cast<InsetOptArg *>(it->inset);
 229                         lines += ins->latexOptional(buf, os, runparams);
 230                         --number;
 231                 }
 232         }
 233         return lines;
 234 }
 235
 236
 237 namespace {
 238
 239 ParagraphList::const_iterator
 240 TeXOnePar(Buffer const & buf,
 241           ParagraphList const & paragraphs,
 242           ParagraphList::const_iterator pit,
 243           odocstream & os, TexRow & texrow,
 244           OutputParams const & runparams_in,
 245           string const & everypar)
 246 {
 247         LYXERR(Debug::LATEX) << "TeXOnePar...     " << &*pit << " '"
 248                 << everypar << "'" << endl;
 249         BufferParams const & bparams = buf.params();
 250         Layout_ptr style;
 251
 252         // In an inset with unlimited length (all in one row),
 253         // force layout to default
 254         if (!pit->forceDefaultParagraphs())
 255                 style = pit->layout();
 256         else
 257                 style = bparams.getTextClass().defaultLayout();
 258
 259         OutputParams runparams = runparams_in;
 260         runparams.moving_arg |= style->needprotect;
 261
 262         // This paragraph's language
 263         Language const * const par_language = pit->getParLanguage(bparams);
 264         // The document's language
 265         Language const * const doc_language = bparams.language;
 266         // The language that was in effect when the environemnt this paragraph is
 267         // inside of was opened
 268         Language const * const outer_language =
 269                 (runparams.local_font != 0) ?
 270                         runparams.local_font->language() : doc_language;
 271         // The previous language that was in effect is either the language of
 272         // the previous paragraph, if there is one, or else the outer language
 273         // if there is no previous paragraph
 274         Language const * const prev_language =
 275                 (pit != paragraphs.begin()) ?
 276                         boost::prior(pit)->getParLanguage(bparams) : outer_language;
 277
 278         if (par_language->babel() != prev_language->babel()
 279             // check if we already put language command in TeXEnvironment()
 280             && !(style->isEnvironment()
 281                  && (pit == paragraphs.begin() ||
 282                      (boost::prior(pit)->layout() != pit->layout() &&
 283                       boost::prior(pit)->getDepth() <= pit->getDepth())
 284                      || boost::prior(pit)->getDepth() < pit->getDepth())))
 285         {
 286                 if (!lyxrc.language_command_end.empty() &&
 287                     prev_language->babel() != outer_language->babel() &&
 288                     !prev_language->babel().empty())
 289                 {
 290                         os << from_ascii(subst(lyxrc.language_command_end,
 291                                 "$$lang",
 292                                 prev_language->babel()))
 293                            << '\n';
 294                         texrow.newline();
 295                 }
 296
 297                 // We need to open a new language if we couldn't close the previous
 298                 // one (because there's no language_command_end); and even if we closed
 299                 // the previous one, if the current language is different than the
 300                 // outer_language (which is currently in effect once the previous one
 301                 // is closed).
 302                 if ((lyxrc.language_command_end.empty() ||
 303                      par_language->babel() != outer_language->babel()) &&
 304                     !par_language->babel().empty()) {
 305                         // If we're inside an inset, and that inset is within an \L or \R
 306                         // (or equivalents), then within the inset, too, any opposite
 307                         // language paragraph should appear within an \L or \R (in addition
 308                         // to, outside of, the normal language switch commands).
 309                         // This behavior is not correct for ArabTeX, though.
 310                         if (    // not for ArabTeX
 311                                         (par_language->lang() != "arabic_arabtex" &&
 312                                          outer_language->lang() != "arabic_arabtex") &&
 313                                         // are we in an inset?
 314                                         runparams.local_font != 0 &&
 315                                         // is the inset within an \L or \R?
 316                                         //
 317                                         // FIXME: currently, we don't check this; this means that
 318                                         // we'll have unnnecessary \L and \R commands, but that
 319                                         // doesn't seem to hurt (though latex will complain)
 320                                         //
 321                                         // is this paragraph in the opposite direction?
 322                                         runparams.local_font->isRightToLeft() !=
 323                                                 par_language->rightToLeft()
 324                                 ) {
 325                                 // FIXME: I don't have a working copy of the Arabi package, so
 326                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 327                                 // or not...
 328                                 if (par_language->lang() == "farsi")
 329                                         os << "\\textFR{";
 330                                 else if (outer_language->lang() == "farsi")
 331                                         os << "\\textLR{";
 332                                 else if (par_language->lang() == "arabic_arabi")
 333                                         os << "\\textAR{";
 334                                 else if (outer_language->lang() == "arabic_arabi")
 335                                         os << "\\textLR{";
 336                                 // remaining RTL languages currently is hebrew
 337                                 else if (par_language->rightToLeft())
 338                                         os << "\\R{";
 339                                 else
 340                                         os << "\\L{";
 341                         }
 342                         os << from_ascii(subst(
 343                                 lyxrc.language_command_begin,
 344                                 "$$lang",
 345                                 par_language->babel()))
 346                            << '\n';
 347                         texrow.newline();
 348                 }
 349         }
 350
 351         // Switch file encoding if necessary; no need to do this for "default"
 352         // encoding, since this only affects the position of the outputted
 353         // \inputencoding command; the encoding switch will occur when necessary
 354         if (bparams.inputenc == "auto" &&
 355             runparams.encoding->package() == Encoding::inputenc) {
 356                 // Look ahead for future encoding changes.
 357                 // We try to output them at the beginning of the paragraph,
 358                 // since the \inputencoding command is not allowed e.g. in
 359                 // sections.
 360                 for (pos_type i = 0; i < pit->size(); ++i) {
 361                         char_type const c = pit->getChar(i);
 362                         if (c < 0x80)
 363                                 continue;
 364                         if (pit->isInset(i))
 365                                 break;
 366                         // All characters before c are in the ASCII range, and
 367                         // c is non-ASCII (but no inset), so change the
 368                         // encoding to that required by the language of c.
 369                         Encoding const * const encoding =
 370                                 pit->getFontSettings(bparams, i).language()->encoding();
 371                         pair<bool, int> enc_switch = switchEncoding(os, bparams, false,
 372                                         *(runparams.encoding), *encoding);
 373                         if (encoding->package() == Encoding::inputenc && enc_switch.first) {
 374                                 runparams.encoding = encoding;
 375                                 if (enc_switch.second > 0) {
 376                                         os << '\n';
 377                                         texrow.newline();
 378                                 }
 379                         }
 380                         break;
 381                 }
 382         }
 383
 384         // In an inset with unlimited length (all in one row),
 385         // don't allow any special options in the paragraph
 386         if (!pit->forceDefaultParagraphs()) {
 387                 if (pit->params().startOfAppendix()) {
 388                         os << "\\appendix\n";
 389                         texrow.newline();
 390                 }
 391
 392                 if (!pit->params().spacing().isDefault()
 393                         && (pit == paragraphs.begin()
 394                             || !boost::prior(pit)->hasSameLayout(*pit)))
 395                 {
 396                         os << from_ascii(pit->params().spacing().writeEnvirBegin())
 397                             << '\n';
 398                         texrow.newline();
 399                 }
 400
 401                 if (style->isCommand()) {
 402                         os << '\n';
 403                         texrow.newline();
 404                 }
 405         }
 406
 407         switch (style->latextype) {
 408         case LATEX_COMMAND:
 409                 os << '\\' << from_ascii(style->latexname());
 410
 411                 // Separate handling of optional argument inset.
 412                 if (style->optionalargs > 0) {
 413                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 414                                                     style->optionalargs);
 415                         while (ret > 0) {
 416                                 texrow.newline();
 417                                 --ret;
 418                         }
 419                 }
 420                 else
 421                         os << from_ascii(style->latexparam());
 422                 break;
 423         case LATEX_ITEM_ENVIRONMENT:
 424         case LATEX_LIST_ENVIRONMENT:
 425                 os << "\\item ";
 426                 break;
 427         case LATEX_BIB_ENVIRONMENT:
 428                 // ignore this, the inset will write itself
 429                 break;
 430         default:
 431                 break;
 432         }
 433
 434         Font const outerfont =
 435                 outerFont(std::distance(paragraphs.begin(), pit),
 436                           paragraphs);
 437
 438         // FIXME UNICODE
 439         os << from_utf8(everypar);
 440         bool need_par = pit->simpleTeXOnePar(buf, bparams, outerfont,
 441                                              os, texrow, runparams);
 442
 443         // Make sure that \\par is done with the font of the last
 444         // character if this has another size as the default.
 445         // This is necessary because LaTeX (and LyX on the screen)
 446         // calculates the space between the baselines according
 447         // to this font. (Matthias)
 448         //
 449         // Is this really needed ? (Dekel)
 450         // We do not need to use to change the font for the last paragraph
 451         // or for a command.
 452
 453         Font const font =
 454                 (pit->empty()
 455                  ? pit->getLayoutFont(bparams, outerfont)
 456                  : pit->getFont(bparams, pit->size() - 1, outerfont));
 457
 458         bool is_command = style->isCommand();
 459
 460         if (style->resfont.size() != font.size()
 461             && boost::next(pit) != paragraphs.end()
 462             && !is_command) {
 463                 if (!need_par)
 464                         os << '{';
 465                 os << "\\" << from_ascii(font.latexSize()) << " \\par}";
 466         } else if (need_par) {
 467                 os << "\\par}";
 468         } else if (is_command)
 469                 os << '}';
 470
 471         bool pending_newline = false;
 472         switch (style->latextype) {
 473         case LATEX_ITEM_ENVIRONMENT:
 474         case LATEX_LIST_ENVIRONMENT:
 475                 if (boost::next(pit) != paragraphs.end()
 476                     && (pit->params().depth() < boost::next(pit)->params().depth()))
 477                         pending_newline = true;
 478                 break;
 479         case LATEX_ENVIRONMENT: {
 480                 // if its the last paragraph of the current environment
 481                 // skip it otherwise fall through
 482                 ParagraphList::const_iterator next = boost::next(pit);
 483
 484                 if (next != paragraphs.end()
 485                     && (next->layout() != pit->layout()
 486                         || next->params().depth() != pit->params().depth()))
 487                         break;
 488         }
 489
 490                 // fall through possible
 491         default:
 492                 // we don't need it for the last paragraph!!!
 493                 if (boost::next(pit) != paragraphs.end())
 494                         pending_newline = true;
 495         }
 496
 497         if (!pit->forceDefaultParagraphs()) {
 498                 if (!pit->params().spacing().isDefault()
 499                         && (boost::next(pit) == paragraphs.end()
 500                             || !boost::next(pit)->hasSameLayout(*pit)))
 501                 {
 502                         if (pending_newline) {
 503                                 os << '\n';
 504                                 texrow.newline();
 505                         }
 506                         os << from_ascii(pit->params().spacing().writeEnvirEnd());
 507                         pending_newline = true;
 508                 }
 509         }
 510
 511         // Closing the language is needed for the last paragraph; it is also
 512         // needed if we're within an \L or \R that we may have opened above (not
 513         // necessarily in this paragraph) and are about to close.
 514         bool closing_rtl_ltr_environment =
 515                 // not for ArabTeX
 516                 (par_language->lang() != "arabic_arabtex" &&
 517                  outer_language->lang() != "arabic_arabtex") &&
 518                 // have we opened and \L or \R environment?
 519                 runparams.local_font != 0 &&
 520                 runparams.local_font->isRightToLeft() != par_language->rightToLeft() &&
 521                 // are we about to close the language?
 522                 ((boost::next(pit) != paragraphs.end() &&
 523                   par_language->babel() !=
 524                         (boost::next(pit)->getParLanguage(bparams))->babel()) ||
 525                  (boost::next(pit) == paragraphs.end() &&
 526                   par_language->babel() != outer_language->babel()));
 527
 528         if (closing_rtl_ltr_environment || (boost::next(pit) == paragraphs.end()
 529             && par_language->babel() != outer_language->babel())) {
 530                 // Since \selectlanguage write the language to the aux file,
 531                 // we need to reset the language at the end of footnote or
 532                 // float.
 533
 534                 if (pending_newline) {
 535                         os << '\n';
 536                         texrow.newline();
 537                 }
 538                 if (lyxrc.language_command_end.empty()) {
 539                         if (!prev_language->babel().empty()) {
 540                                 os << from_ascii(subst(
 541                                         lyxrc.language_command_begin,
 542                                         "$$lang",
 543                                         prev_language->babel()));
 544                                 pending_newline = true;
 545                         }
 546                 } else if (!par_language->babel().empty()) {
 547                         os << from_ascii(subst(
 548                                 lyxrc.language_command_end,
 549                                 "$$lang",
 550                                 par_language->babel()));
 551                         pending_newline = true;
 552                 }
 553         }
 554         if (closing_rtl_ltr_environment)
 555                 os << "}";
 556
 557         if (pending_newline) {
 558                 os << '\n';
 559                 texrow.newline();
 560         }
 561
 562         // If this is the last paragraph, and a local_font was set upon entering
 563         // the inset, the encoding should be set back to that local_font's
 564         // encoding. We don't use switchEncoding(), because no explicit encoding
 565         // switch command is needed, since latex will automatically revert to it
 566         // when this inset closes.
 567         // This switch is only necessary if we're using "auto" or "default"
 568         // encoding.
 569         if (boost::next(pit) == paragraphs.end() && runparams_in.local_font != 0) {
 570                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
 571                 if (bparams.inputenc == "auto" || bparams.inputenc == "default")
 572                         os << setEncoding(runparams_in.encoding->iconvName());
 573
 574         }
 575         // Otherwise, the current encoding should be set for the next paragraph.
 576         else
 577                 runparams_in.encoding = runparams.encoding;
 578
 579
 580         // we don't need it for the last paragraph!!!
 581         // Note from JMarc: we will re-add a \n explicitely in
 582         // TeXEnvironment, because it is needed in this case
 583         if (boost::next(pit) != paragraphs.end()) {
 584                 os << '\n';
 585                 texrow.newline();
 586         }
 587
 588         if (boost::next(pit) != paragraphs.end())
 589                 LYXERR(Debug::LATEX) << "TeXOnePar...done " << &*boost::next(pit) << endl;
 590
 591         return ++pit;
 592 }
 593
 594 } // anon namespace
 595
 596
 597 // LaTeX all paragraphs
 598 void latexParagraphs(Buffer const & buf,
 599                      ParagraphList const & paragraphs,
 600                      odocstream & os,
 601                      TexRow & texrow,
 602                      OutputParams const & runparams,
 603                      string const & everypar)
 604 {
 605         bool was_title = false;
 606         bool already_title = false;
 607         TextClass const & tclass = buf.params().getTextClass();
 608         ParagraphList::const_iterator par = paragraphs.begin();
 609         ParagraphList::const_iterator endpar = paragraphs.end();
 610
 611         BOOST_ASSERT(runparams.par_begin <= runparams.par_end);
 612         // if only part of the paragraphs will be outputed
 613         if (runparams.par_begin !=  runparams.par_end) {
 614                 par = boost::next(paragraphs.begin(), runparams.par_begin);
 615                 endpar = boost::next(paragraphs.begin(), runparams.par_end);
 616                 // runparams will be passed to nested paragraphs, so
 617                 // we have to reset the range parameters.
 618                 const_cast<OutputParams&>(runparams).par_begin = 0;
 619                 const_cast<OutputParams&>(runparams).par_end = 0;
 620         }
 621
 622         // if only_body
 623         while (par != endpar) {
 624                 ParagraphList::const_iterator lastpar = par;
 625                 // well we have to check if we are in an inset with unlimited
 626                 // length (all in one row) if that is true then we don't allow
 627                 // any special options in the paragraph and also we don't allow
 628                 // any environment other than the default layout of the
 629                 // text class to be valid!
 630                 if (!par->forceDefaultParagraphs()) {
 631                         Layout_ptr const & layout = par->layout();
 632
 633                         if (layout->intitle) {
 634                                 if (already_title) {
 635                                         lyxerr << "Error in latexParagraphs: You"
 636                                                 " should not mix title layouts"
 637                                                 " with normal ones." << endl;
 638                                 } else if (!was_title) {
 639                                         was_title = true;
 640                                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
 641                                                 os << "\\begin{"
 642                                                     << from_ascii(tclass.titlename())
 643                                                     << "}\n";
 644                                                 texrow.newline();
 645                                         }
 646                                 }
 647                         } else if (was_title && !already_title) {
 648                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 649                                         os << "\\end{" << from_ascii(tclass.titlename())
 650                                             << "}\n";
 651                                 }
 652                                 else {
 653                                         os << "\\" << from_ascii(tclass.titlename())
 654                                             << "\n";
 655                                 }
 656                                 texrow.newline();
 657                                 already_title = true;
 658                                 was_title = false;
 659                         }
 660
 661                         if (layout->is_environment) {
 662                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 663                                                 runparams, everypar);
 664                         } else if (layout->isEnvironment() ||
 665                                    !par->params().leftIndent().zero()) {
 666                                 par = TeXEnvironment(buf, paragraphs, par, os,
 667                                                      texrow, runparams);
 668                         } else {
 669                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 670                                                 runparams, everypar);
 671                         }
 672                 } else {
 673                         par = TeXOnePar(buf, paragraphs, par, os, texrow,
 674                                         runparams, everypar);
 675                 }
 676                 if (std::distance(lastpar, par) >= std::distance(lastpar, endpar))
 677                         break;
 678         }
 679         // It might be that we only have a title in this document
 680         if (was_title && !already_title) {
 681                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 682                         os << "\\end{" << from_ascii(tclass.titlename())
 683                             << "}\n";
 684                 }
 685                 else {
 686                         os << "\\" << from_ascii(tclass.titlename())
 687                             << "\n";
 688                                 }
 689                 texrow.newline();
 690         }
 691 }
 692
 693
 694 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
 695                    bool moving_arg, Encoding const & oldEnc,
 696                    Encoding const & newEnc)
 697 {
 698         if ((bparams.inputenc != "auto" && bparams.inputenc != "default")
 699                 || moving_arg)
 700                 return make_pair(false, 0);
 701
 702         // Do nothing if the encoding is unchanged.
 703         if (oldEnc.name() == newEnc.name())
 704                 return make_pair(false, 0);
 705
 706         // FIXME We ignore encoding switches from/to encodings that do
 707         // neither support the inputenc package nor the CJK package here.
 708         // This does of course only work in special cases (e.g. switch from
 709         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
 710         // but it is the best we can do
 711         if (oldEnc.package() == Encoding::none
 712                 || newEnc.package() == Encoding::none)
 713                 return make_pair(false, 0);
 714
 715         LYXERR(Debug::LATEX) << "Changing LaTeX encoding from "
 716                 << oldEnc.name() << " to "
 717                 << newEnc.name() << endl;
 718         os << setEncoding(newEnc.iconvName());
 719         if (bparams.inputenc == "default")
 720                 return make_pair(true, 0);
 721
 722         docstring const inputenc(from_ascii(newEnc.latexName()));
 723         switch (newEnc.package()) {
 724                 case Encoding::none:
 725                         // shouldn't ever reach here, see above
 726                         return make_pair(true, 0);
 727                 case Encoding::inputenc: {
 728                         int count = inputenc.length();
 729                         if (oldEnc.package() == Encoding::CJK) {
 730                                 os << "\\end{CJK}";
 731                                 count += 9;
 732                         }
 733                         os << "\\inputencoding{" << inputenc << '}';
 734                         return make_pair(true, count + 16);
 735                  }
 736                 case Encoding::CJK: {
 737                         int count = inputenc.length();
 738                         if (oldEnc.package() == Encoding::CJK) {
 739                                 os << "\\end{CJK}";
 740                                 count += 9;
 741                         }
 742                         os << "\\begin{CJK}{" << inputenc << "}{}";
 743                         return make_pair(true, count + 15);
 744                 }
 745         }
 746         // Dead code to avoid a warning:
 747         return make_pair(true, 0);
 748 }
 749
 750 } // namespace lyx