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 "InsetList.h"
  20 #include "Language.h"
  21 #include "Layout.h"
  22 #include "LyXRC.h"
  23 #include "OutputParams.h"
  24 #include "Paragraph.h"
  25 #include "paragraph_funcs.h"
  26 #include "ParagraphParameters.h"
  27 #include "TexRow.h"
  28 #include "VSpace.h"
  29
  30 #include "insets/InsetBibitem.h"
  31 #include "insets/InsetOptArg.h"
  32
  33 #include "support/lstrings.h"
  34
  35 #include <boost/next_prior.hpp>
  36
  37 namespace lyx {
  38
  39 using support::subst;
  40
  41 using std::endl;
  42 using std::string;
  43 using std::pair;
  44 using std::make_pair;
  45
  46
  47 namespace {
  48
  49 ParagraphList::const_iterator
  50 TeXEnvironment(Buffer const & buf,
  51                ParagraphList const & paragraphs,
  52                ParagraphList::const_iterator pit,
  53                odocstream & os, TexRow & texrow,
  54                OutputParams const & runparams);
  55
  56 ParagraphList::const_iterator
  57 TeXOnePar(Buffer const & buf,
  58           ParagraphList const & paragraphs,
  59           ParagraphList::const_iterator pit,
  60           odocstream & os, TexRow & texrow,
  61           OutputParams const & runparams,
  62           string const & everypar = string());
  63
  64
  65 ParagraphList::const_iterator
  66 TeXDeeper(Buffer const & buf,
  67           ParagraphList const & paragraphs,
  68           ParagraphList::const_iterator pit,
  69           odocstream & os, TexRow & texrow,
  70           OutputParams const & runparams)
  71 {
  72         LYXERR(Debug::LATEX) << "TeXDeeper...     " << &*pit << endl;
  73         ParagraphList::const_iterator par = pit;
  74
  75         while (par != paragraphs.end() &&
  76                      par->params().depth() == pit->params().depth()) {
  77                 if (par->layout()->isEnvironment()) {
  78                         par = TeXEnvironment(buf, paragraphs, par,
  79                                              os, texrow, runparams);
  80                 } else {
  81                         par = TeXOnePar(buf, paragraphs, par,
  82                                              os, texrow, runparams);
  83                 }
  84         }
  85         LYXERR(Debug::LATEX) << "TeXDeeper...done " << endl;
  86
  87         return par;
  88 }
  89
  90
  91 ParagraphList::const_iterator
  92 TeXEnvironment(Buffer const & buf,
  93                ParagraphList const & paragraphs,
  94                ParagraphList::const_iterator pit,
  95                odocstream & os, TexRow & texrow,
  96                OutputParams const & runparams)
  97 {
  98         LYXERR(Debug::LATEX) << "TeXEnvironment...     " << &*pit << endl;
  99
 100         BufferParams const & bparams = buf.params();
 101
 102         LayoutPtr const & style = pit->layout();
 103
 104         Language const * const par_language = pit->getParLanguage(bparams);
 105         Language const * const doc_language = bparams.language;
 106         Language const * const prev_par_language =
 107                 (pit != paragraphs.begin())
 108                 ? boost::prior(pit)->getParLanguage(bparams)
 109                 : doc_language;
 110         if (par_language->babel() != prev_par_language->babel()) {
 111
 112                 if (!lyxrc.language_command_end.empty() &&
 113                     prev_par_language->babel() != doc_language->babel() &&
 114                     !prev_par_language->babel().empty()) {
 115                         os << from_ascii(subst(
 116                                 lyxrc.language_command_end,
 117                                 "$$lang",
 118                                 prev_par_language->babel()))
 119                            << '\n';
 120                         texrow.newline();
 121                 }
 122
 123                 if ((lyxrc.language_command_end.empty() ||
 124                      par_language->babel() != doc_language->babel()) &&
 125                     !par_language->babel().empty()) {
 126                         os << from_ascii(subst(
 127                                 lyxrc.language_command_begin,
 128                                 "$$lang",
 129                                 par_language->babel()))
 130                            << '\n';
 131                         texrow.newline();
 132                 }
 133         }
 134
 135         bool leftindent_open = false;
 136         if (!pit->params().leftIndent().zero()) {
 137                 os << "\\begin{LyXParagraphLeftIndent}{"
 138                    << from_ascii(pit->params().leftIndent().asLatexString())
 139                    << "}\n";
 140                 texrow.newline();
 141                 leftindent_open = true;
 142         }
 143
 144         if (style->isEnvironment()) {
 145                 os << "\\begin{" << from_ascii(style->latexname()) << '}';
 146                 if (style->optionalargs > 0) {
 147                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 148                                                     style->optionalargs);
 149                         while (ret > 0) {
 150                                 texrow.newline();
 151                                 --ret;
 152                         }
 153                 }
 154                 if (style->latextype == LATEX_LIST_ENVIRONMENT) {
 155                         os << '{'
 156                            << pit->params().labelWidthString()
 157                            << "}\n";
 158                 } else if (style->labeltype == LABEL_BIBLIO) {
 159                         // ale970405
 160                         os << '{' << bibitemWidest(buf) << "}\n";
 161                 } else
 162                         os << from_ascii(style->latexparam()) << '\n';
 163                 texrow.newline();
 164         }
 165         ParagraphList::const_iterator par = pit;
 166         do {
 167                 par = TeXOnePar(buf, paragraphs, par, os, texrow, runparams);
 168
 169                 if (par == paragraphs.end()) {
 170                         // Make sure that the last paragraph is
 171                         // correctly terminated (because TeXOnePar does
 172                         // not add a \n in this case)
 173                         os << '\n';
 174                         texrow.newline();
 175                 } else if (par->params().depth() > pit->params().depth()) {
 176                         if (par->layout()->isParagraph()) {
 177                           // Thinko!
 178                           // How to handle this? (Lgb)
 179                           //&& !suffixIs(os, "\n\n")
 180                                   //) {
 181
 182                                 // There should be at least one '\n' already
 183                                 // but we need there to be two for Standard
 184                                 // paragraphs that are depth-increment'ed to be
 185                                 // output correctly.  However, tables can
 186                                 // also be paragraphs so don't adjust them.
 187                                 // ARRae
 188                                 // Thinkee:
 189                                 // Will it ever harm to have one '\n' too
 190                                 // many? i.e. that we sometimes will have
 191                                 // three in a row. (Lgb)
 192                                 os << '\n';
 193                                 texrow.newline();
 194                         }
 195                         par = TeXDeeper(buf, paragraphs, par, os, texrow,
 196                                         runparams);
 197                 }
 198         } while (par != paragraphs.end()
 199                  && par->layout() == pit->layout()
 200                  && par->params().depth() == pit->params().depth()
 201                  && par->params().leftIndent() == pit->params().leftIndent());
 202
 203         if (style->isEnvironment()) {
 204                 os << "\\end{" << from_ascii(style->latexname()) << "}\n";
 205                 texrow.newline();
 206         }
 207
 208         if (leftindent_open) {
 209                 os << "\\end{LyXParagraphLeftIndent}\n";
 210                 texrow.newline();
 211         }
 212
 213         if (par != paragraphs.end()) {
 214                 LYXERR(Debug::LATEX) << "TeXEnvironment...done " << &*par << endl;
 215         }
 216         return par;
 217 }
 218
 219 }
 220
 221
 222 int latexOptArgInsets(Buffer const & buf, Paragraph const & par,
 223                       odocstream & os, OutputParams const & runparams, int number)
 224 {
 225         int lines = 0;
 226
 227         InsetList::const_iterator it = par.insetList().begin();
 228         InsetList::const_iterator end = par.insetList().end();
 229         for (; it != end && number > 0 ; ++it) {
 230                 if (it->inset->lyxCode() == OPTARG_CODE) {
 231                         InsetOptArg * ins =
 232                                 static_cast<InsetOptArg *>(it->inset);
 233                         lines += ins->latexOptional(buf, os, runparams);
 234                         --number;
 235                 }
 236         }
 237         return lines;
 238 }
 239
 240
 241 namespace {
 242
 243 ParagraphList::const_iterator
 244 TeXOnePar(Buffer const & buf,
 245           ParagraphList const & paragraphs,
 246           ParagraphList::const_iterator pit,
 247           odocstream & os, TexRow & texrow,
 248           OutputParams const & runparams_in,
 249           string const & everypar)
 250 {
 251         LYXERR(Debug::LATEX) << "TeXOnePar...     " << &*pit << " '"
 252                 << everypar << "'" << endl;
 253         BufferParams const & bparams = buf.params();
 254         LayoutPtr style;
 255
 256         if (runparams_in.verbatim) {
 257                 Font const outerfont =
 258                         outerFont(std::distance(paragraphs.begin(), pit),
 259                                   paragraphs);
 260                 // FIXME UNICODE
 261                 bool need_par = pit->latex(buf, bparams, outerfont,
 262                                              os, texrow, runparams_in);
 263                 os << '\n';
 264                 texrow.newline();
 265                 return ++pit;
 266         }
 267
 268         // In an inset with unlimited length (all in one row),
 269         // force layout to default
 270         if (!pit->forceDefaultParagraphs())
 271                 style = pit->layout();
 272         else
 273                 style = bparams.getTextClass().defaultLayout();
 274
 275         OutputParams runparams = runparams_in;
 276         runparams.moving_arg |= style->needprotect;
 277
 278         // This paragraph's language
 279         Language const * const par_language = pit->getParLanguage(bparams);
 280         // The document's language
 281         Language const * const doc_language = bparams.language;
 282         // The language that was in effect when the environemnt this paragraph is
 283         // inside of was opened
 284         Language const * const outer_language =
 285                 (runparams.local_font != 0) ?
 286                         runparams.local_font->language() : doc_language;
 287         // The previous language that was in effect is either the language of
 288         // the previous paragraph, if there is one, or else the outer language
 289         // if there is no previous paragraph
 290         Language const * const prev_language =
 291                 (pit != paragraphs.begin()) ?
 292                         boost::prior(pit)->getParLanguage(bparams) : outer_language;
 293
 294         if (par_language->babel() != prev_language->babel()
 295             // check if we already put language command in TeXEnvironment()
 296             && !(style->isEnvironment()
 297                  && (pit == paragraphs.begin() ||
 298                      (boost::prior(pit)->layout() != pit->layout() &&
 299                       boost::prior(pit)->getDepth() <= pit->getDepth())
 300                      || boost::prior(pit)->getDepth() < pit->getDepth())))
 301         {
 302                 if (!lyxrc.language_command_end.empty() &&
 303                     prev_language->babel() != outer_language->babel() &&
 304                     !prev_language->babel().empty())
 305                 {
 306                         os << from_ascii(subst(lyxrc.language_command_end,
 307                                 "$$lang",
 308                                 prev_language->babel()))
 309                            << '\n';
 310                         texrow.newline();
 311                 }
 312
 313                 // We need to open a new language if we couldn't close the previous
 314                 // one (because there's no language_command_end); and even if we closed
 315                 // the previous one, if the current language is different than the
 316                 // outer_language (which is currently in effect once the previous one
 317                 // is closed).
 318                 if ((lyxrc.language_command_end.empty() ||
 319                      par_language->babel() != outer_language->babel()) &&
 320                     !par_language->babel().empty()) {
 321                         // If we're inside an inset, and that inset is within an \L or \R
 322                         // (or equivalents), then within the inset, too, any opposite
 323                         // language paragraph should appear within an \L or \R (in addition
 324                         // to, outside of, the normal language switch commands).
 325                         // This behavior is not correct for ArabTeX, though.
 326                         if (    // not for ArabTeX
 327                                         (par_language->lang() != "arabic_arabtex" &&
 328                                          outer_language->lang() != "arabic_arabtex") &&
 329                                         // are we in an inset?
 330                                         runparams.local_font != 0 &&
 331                                         // is the inset within an \L or \R?
 332                                         //
 333                                         // FIXME: currently, we don't check this; this means that
 334                                         // we'll have unnnecessary \L and \R commands, but that
 335                                         // doesn't seem to hurt (though latex will complain)
 336                                         //
 337                                         // is this paragraph in the opposite direction?
 338                                         runparams.local_font->isRightToLeft() !=
 339                                                 par_language->rightToLeft()
 340                                 ) {
 341                                 // FIXME: I don't have a working copy of the Arabi package, so
 342                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 343                                 // or not...
 344                                 if (par_language->lang() == "farsi")
 345                                         os << "\\textFR{";
 346                                 else if (outer_language->lang() == "farsi")
 347                                         os << "\\textLR{";
 348                                 else if (par_language->lang() == "arabic_arabi")
 349                                         os << "\\textAR{";
 350                                 else if (outer_language->lang() == "arabic_arabi")
 351                                         os << "\\textLR{";
 352                                 // remaining RTL languages currently is hebrew
 353                                 else if (par_language->rightToLeft())
 354                                         os << "\\R{";
 355                                 else
 356                                         os << "\\L{";
 357                         }
 358                         os << from_ascii(subst(
 359                                 lyxrc.language_command_begin,
 360                                 "$$lang",
 361                                 par_language->babel()))
 362                            << '\n';
 363                         texrow.newline();
 364                 }
 365         }
 366
 367         // Switch file encoding if necessary; no need to do this for "default"
 368         // encoding, since this only affects the position of the outputted
 369         // \inputencoding command; the encoding switch will occur when necessary
 370         if (bparams.inputenc == "auto" &&
 371             runparams.encoding->package() == Encoding::inputenc) {
 372                 // Look ahead for future encoding changes.
 373                 // We try to output them at the beginning of the paragraph,
 374                 // since the \inputencoding command is not allowed e.g. in
 375                 // sections.
 376                 for (pos_type i = 0; i < pit->size(); ++i) {
 377                         char_type const c = pit->getChar(i);
 378                         if (c < 0x80)
 379                                 continue;
 380                         if (pit->isInset(i))
 381                                 break;
 382                         // All characters before c are in the ASCII range, and
 383                         // c is non-ASCII (but no inset), so change the
 384                         // encoding to that required by the language of c.
 385                         Encoding const * const encoding =
 386                                 pit->getFontSettings(bparams, i).language()->encoding();
 387                         pair<bool, int> enc_switch = switchEncoding(os, bparams, false,
 388                                         *(runparams.encoding), *encoding);
 389                         if (encoding->package() == Encoding::inputenc && enc_switch.first) {
 390                                 runparams.encoding = encoding;
 391                                 if (enc_switch.second > 0) {
 392                                         os << '\n';
 393                                         texrow.newline();
 394                                 }
 395                         }
 396                         break;
 397                 }
 398         }
 399
 400         // In an inset with unlimited length (all in one row),
 401         // don't allow any special options in the paragraph
 402         if (!pit->forceDefaultParagraphs()) {
 403                 if (pit->params().startOfAppendix()) {
 404                         os << "\\appendix\n";
 405                         texrow.newline();
 406                 }
 407
 408                 if (!pit->params().spacing().isDefault()
 409                         && (pit == paragraphs.begin()
 410                             || !boost::prior(pit)->hasSameLayout(*pit)))
 411                 {
 412                         os << from_ascii(pit->params().spacing().writeEnvirBegin())
 413                             << '\n';
 414                         texrow.newline();
 415                 }
 416
 417                 if (style->isCommand()) {
 418                         os << '\n';
 419                         texrow.newline();
 420                 }
 421         }
 422
 423         switch (style->latextype) {
 424         case LATEX_COMMAND:
 425                 os << '\\' << from_ascii(style->latexname());
 426
 427                 // Separate handling of optional argument inset.
 428                 if (style->optionalargs > 0) {
 429                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 430                                                     style->optionalargs);
 431                         while (ret > 0) {
 432                                 texrow.newline();
 433                                 --ret;
 434                         }
 435                 }
 436                 else
 437                         os << from_ascii(style->latexparam());
 438                 break;
 439         case LATEX_ITEM_ENVIRONMENT:
 440         case LATEX_LIST_ENVIRONMENT:
 441                 os << "\\item ";
 442                 break;
 443         case LATEX_BIB_ENVIRONMENT:
 444                 // ignore this, the inset will write itself
 445                 break;
 446         default:
 447                 break;
 448         }
 449
 450         Font const outerfont =
 451                 outerFont(std::distance(paragraphs.begin(), pit),
 452                           paragraphs);
 453
 454         // FIXME UNICODE
 455         os << from_utf8(everypar);
 456         bool need_par = pit->latex(buf, bparams, outerfont,
 457                                              os, texrow, runparams);
 458
 459         // Make sure that \\par is done with the font of the last
 460         // character if this has another size as the default.
 461         // This is necessary because LaTeX (and LyX on the screen)
 462         // calculates the space between the baselines according
 463         // to this font. (Matthias)
 464         //
 465         // Is this really needed ? (Dekel)
 466         // We do not need to use to change the font for the last paragraph
 467         // or for a command.
 468
 469         Font const font =
 470                 (pit->empty()
 471                  ? pit->getLayoutFont(bparams, outerfont)
 472                  : pit->getFont(bparams, pit->size() - 1, outerfont));
 473
 474         bool is_command = style->isCommand();
 475
 476         if (style->resfont.size() != font.size()
 477             && boost::next(pit) != paragraphs.end()
 478             && !is_command) {
 479                 if (!need_par)
 480                         os << '{';
 481                 os << "\\" << from_ascii(font.latexSize()) << " \\par}";
 482         } else if (need_par) {
 483                 os << "\\par}";
 484         } else if (is_command)
 485                 os << '}';
 486
 487         bool pending_newline = false;
 488         switch (style->latextype) {
 489         case LATEX_ITEM_ENVIRONMENT:
 490         case LATEX_LIST_ENVIRONMENT:
 491                 if (boost::next(pit) != paragraphs.end()
 492                     && (pit->params().depth() < boost::next(pit)->params().depth()))
 493                         pending_newline = true;
 494                 break;
 495         case LATEX_ENVIRONMENT: {
 496                 // if its the last paragraph of the current environment
 497                 // skip it otherwise fall through
 498                 ParagraphList::const_iterator next = boost::next(pit);
 499
 500                 if (next != paragraphs.end()
 501                     && (next->layout() != pit->layout()
 502                         || next->params().depth() != pit->params().depth()))
 503                         break;
 504         }
 505
 506                 // fall through possible
 507         default:
 508                 // we don't need it for the last paragraph!!!
 509                 if (boost::next(pit) != paragraphs.end())
 510                         pending_newline = true;
 511         }
 512
 513         if (!pit->forceDefaultParagraphs()) {
 514                 if (!pit->params().spacing().isDefault()
 515                         && (boost::next(pit) == paragraphs.end()
 516                             || !boost::next(pit)->hasSameLayout(*pit)))
 517                 {
 518                         if (pending_newline) {
 519                                 os << '\n';
 520                                 texrow.newline();
 521                         }
 522                         os << from_ascii(pit->params().spacing().writeEnvirEnd());
 523                         pending_newline = true;
 524                 }
 525         }
 526
 527         // Closing the language is needed for the last paragraph; it is also
 528         // needed if we're within an \L or \R that we may have opened above (not
 529         // necessarily in this paragraph) and are about to close.
 530         bool closing_rtl_ltr_environment =
 531                 // not for ArabTeX
 532                 (par_language->lang() != "arabic_arabtex" &&
 533                  outer_language->lang() != "arabic_arabtex") &&
 534                 // have we opened and \L or \R environment?
 535                 runparams.local_font != 0 &&
 536                 runparams.local_font->isRightToLeft() != par_language->rightToLeft() &&
 537                 // are we about to close the language?
 538                 ((boost::next(pit) != paragraphs.end() &&
 539                   par_language->babel() !=
 540                         (boost::next(pit)->getParLanguage(bparams))->babel()) ||
 541                  (boost::next(pit) == paragraphs.end() &&
 542                   par_language->babel() != outer_language->babel()));
 543
 544         if (closing_rtl_ltr_environment || (boost::next(pit) == paragraphs.end()
 545             && par_language->babel() != outer_language->babel())) {
 546                 // Since \selectlanguage write the language to the aux file,
 547                 // we need to reset the language at the end of footnote or
 548                 // float.
 549
 550                 if (pending_newline) {
 551                         os << '\n';
 552                         texrow.newline();
 553                 }
 554                 if (lyxrc.language_command_end.empty()) {
 555                         if (!prev_language->babel().empty()) {
 556                                 os << from_ascii(subst(
 557                                         lyxrc.language_command_begin,
 558                                         "$$lang",
 559                                         prev_language->babel()));
 560                                 pending_newline = true;
 561                         }
 562                 } else if (!par_language->babel().empty()) {
 563                         os << from_ascii(subst(
 564                                 lyxrc.language_command_end,
 565                                 "$$lang",
 566                                 par_language->babel()));
 567                         pending_newline = true;
 568                 }
 569         }
 570         if (closing_rtl_ltr_environment)
 571                 os << "}";
 572
 573         if (pending_newline) {
 574                 os << '\n';
 575                 texrow.newline();
 576         }
 577
 578         // If this is the last paragraph, and a local_font was set upon entering
 579         // the inset, the encoding should be set back to that local_font's
 580         // encoding. We don't use switchEncoding(), because no explicit encoding
 581         // switch command is needed, since latex will automatically revert to it
 582         // when this inset closes.
 583         // This switch is only necessary if we're using "auto" or "default"
 584         // encoding.
 585         if (boost::next(pit) == paragraphs.end() && runparams_in.local_font != 0) {
 586                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
 587                 if (bparams.inputenc == "auto" || bparams.inputenc == "default")
 588                         os << setEncoding(runparams_in.encoding->iconvName());
 589
 590         }
 591         // Otherwise, the current encoding should be set for the next paragraph.
 592         else
 593                 runparams_in.encoding = runparams.encoding;
 594
 595
 596         // we don't need it for the last paragraph!!!
 597         // Note from JMarc: we will re-add a \n explicitely in
 598         // TeXEnvironment, because it is needed in this case
 599         if (boost::next(pit) != paragraphs.end()) {
 600                 os << '\n';
 601                 texrow.newline();
 602         }
 603
 604         if (boost::next(pit) != paragraphs.end()) {
 605                 LYXERR(Debug::LATEX) << "TeXOnePar...done " << &*boost::next(pit) << endl;
 606         }
 607
 608         return ++pit;
 609 }
 610
 611 } // anon namespace
 612
 613
 614 // LaTeX all paragraphs
 615 void latexParagraphs(Buffer const & buf,
 616                      ParagraphList const & paragraphs,
 617                      odocstream & os,
 618                      TexRow & texrow,
 619                      OutputParams const & runparams,
 620                      string const & everypar)
 621 {
 622         bool was_title = false;
 623         bool already_title = false;
 624         TextClass const & tclass = buf.params().getTextClass();
 625         ParagraphList::const_iterator par = paragraphs.begin();
 626         ParagraphList::const_iterator endpar = paragraphs.end();
 627
 628         BOOST_ASSERT(runparams.par_begin <= runparams.par_end);
 629         // if only part of the paragraphs will be outputed
 630         if (runparams.par_begin !=  runparams.par_end) {
 631                 par = boost::next(paragraphs.begin(), runparams.par_begin);
 632                 endpar = boost::next(paragraphs.begin(), runparams.par_end);
 633                 // runparams will be passed to nested paragraphs, so
 634                 // we have to reset the range parameters.
 635                 const_cast<OutputParams&>(runparams).par_begin = 0;
 636                 const_cast<OutputParams&>(runparams).par_end = 0;
 637         }
 638
 639         // if only_body
 640         while (par != endpar) {
 641                 ParagraphList::const_iterator lastpar = par;
 642                 // well we have to check if we are in an inset with unlimited
 643                 // length (all in one row) if that is true then we don't allow
 644                 // any special options in the paragraph and also we don't allow
 645                 // any environment other than the default layout of the
 646                 // text class to be valid!
 647                 if (!par->forceDefaultParagraphs()) {
 648                         LayoutPtr const & layout = par->layout();
 649
 650                         if (layout->intitle) {
 651                                 if (already_title) {
 652                                         lyxerr << "Error in latexParagraphs: You"
 653                                                 " should not mix title layouts"
 654                                                 " with normal ones." << endl;
 655                                 } else if (!was_title) {
 656                                         was_title = true;
 657                                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
 658                                                 os << "\\begin{"
 659                                                     << from_ascii(tclass.titlename())
 660                                                     << "}\n";
 661                                                 texrow.newline();
 662                                         }
 663                                 }
 664                         } else if (was_title && !already_title) {
 665                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 666                                         os << "\\end{" << from_ascii(tclass.titlename())
 667                                             << "}\n";
 668                                 }
 669                                 else {
 670                                         os << "\\" << from_ascii(tclass.titlename())
 671                                             << "\n";
 672                                 }
 673                                 texrow.newline();
 674                                 already_title = true;
 675                                 was_title = false;
 676                         }
 677
 678                         if (layout->is_environment) {
 679                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 680                                                 runparams, everypar);
 681                         } else if (layout->isEnvironment() ||
 682                                    !par->params().leftIndent().zero()) {
 683                                 par = TeXEnvironment(buf, paragraphs, par, os,
 684                                                      texrow, runparams);
 685                         } else {
 686                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 687                                                 runparams, everypar);
 688                         }
 689                 } else {
 690                         par = TeXOnePar(buf, paragraphs, par, os, texrow,
 691                                         runparams, everypar);
 692                 }
 693                 if (std::distance(lastpar, par) >= std::distance(lastpar, endpar))
 694                         break;
 695         }
 696         // It might be that we only have a title in this document
 697         if (was_title && !already_title) {
 698                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 699                         os << "\\end{" << from_ascii(tclass.titlename())
 700                             << "}\n";
 701                 }
 702                 else {
 703                         os << "\\" << from_ascii(tclass.titlename())
 704                             << "\n";
 705                                 }
 706                 texrow.newline();
 707         }
 708 }
 709
 710
 711 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
 712                    bool moving_arg, Encoding const & oldEnc,
 713                    Encoding const & newEnc)
 714 {
 715         if ((bparams.inputenc != "auto" && bparams.inputenc != "default")
 716                 || moving_arg)
 717                 return make_pair(false, 0);
 718
 719         // Do nothing if the encoding is unchanged.
 720         if (oldEnc.name() == newEnc.name())
 721                 return make_pair(false, 0);
 722
 723         // FIXME We ignore encoding switches from/to encodings that do
 724         // neither support the inputenc package nor the CJK package here.
 725         // This does of course only work in special cases (e.g. switch from
 726         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
 727         // but it is the best we can do
 728         if (oldEnc.package() == Encoding::none
 729                 || newEnc.package() == Encoding::none)
 730                 return make_pair(false, 0);
 731
 732         LYXERR(Debug::LATEX) << "Changing LaTeX encoding from "
 733                 << oldEnc.name() << " to "
 734                 << newEnc.name() << endl;
 735         os << setEncoding(newEnc.iconvName());
 736         if (bparams.inputenc == "default")
 737                 return make_pair(true, 0);
 738
 739         docstring const inputenc(from_ascii(newEnc.latexName()));
 740         switch (newEnc.package()) {
 741                 case Encoding::none:
 742                         // shouldn't ever reach here, see above
 743                         return make_pair(true, 0);
 744                 case Encoding::inputenc: {
 745                         int count = inputenc.length();
 746                         if (oldEnc.package() == Encoding::CJK) {
 747                                 os << "\\end{CJK}";
 748                                 count += 9;
 749                         }
 750                         os << "\\inputencoding{" << inputenc << '}';
 751                         return make_pair(true, count + 16);
 752                  }
 753                 case Encoding::CJK: {
 754                         int count = inputenc.length();
 755                         if (oldEnc.package() == Encoding::CJK) {
 756                                 os << "\\end{CJK}";
 757                                 count += 9;
 758                         }
 759                         os << "\\begin{CJK}{" << inputenc << "}{}";
 760                         return make_pair(true, count + 15);
 761                 }
 762         }
 763         // Dead code to avoid a warning:
 764         return make_pair(true, 0);
 765 }
 766
 767 } // namespace lyx