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         // In an inset with unlimited length (all in one row),
 257         // force layout to default
 258         if (!pit->forceDefaultParagraphs())
 259                 style = pit->layout();
 260         else
 261                 style = bparams.getTextClass().defaultLayout();
 262
 263         OutputParams runparams = runparams_in;
 264         runparams.moving_arg |= style->needprotect;
 265
 266         // This paragraph's language
 267         Language const * const par_language = pit->getParLanguage(bparams);
 268         // The document's language
 269         Language const * const doc_language = bparams.language;
 270         // The language that was in effect when the environemnt this paragraph is
 271         // inside of was opened
 272         Language const * const outer_language =
 273                 (runparams.local_font != 0) ?
 274                         runparams.local_font->language() : doc_language;
 275         // The previous language that was in effect is either the language of
 276         // the previous paragraph, if there is one, or else the outer language
 277         // if there is no previous paragraph
 278         Language const * const prev_language =
 279                 (pit != paragraphs.begin()) ?
 280                         boost::prior(pit)->getParLanguage(bparams) : outer_language;
 281
 282         if (par_language->babel() != prev_language->babel()
 283             // check if we already put language command in TeXEnvironment()
 284             && !(style->isEnvironment()
 285                  && (pit == paragraphs.begin() ||
 286                      (boost::prior(pit)->layout() != pit->layout() &&
 287                       boost::prior(pit)->getDepth() <= pit->getDepth())
 288                      || boost::prior(pit)->getDepth() < pit->getDepth())))
 289         {
 290                 if (!lyxrc.language_command_end.empty() &&
 291                     prev_language->babel() != outer_language->babel() &&
 292                     !prev_language->babel().empty())
 293                 {
 294                         os << from_ascii(subst(lyxrc.language_command_end,
 295                                 "$$lang",
 296                                 prev_language->babel()))
 297                            << '\n';
 298                         texrow.newline();
 299                 }
 300
 301                 // We need to open a new language if we couldn't close the previous
 302                 // one (because there's no language_command_end); and even if we closed
 303                 // the previous one, if the current language is different than the
 304                 // outer_language (which is currently in effect once the previous one
 305                 // is closed).
 306                 if ((lyxrc.language_command_end.empty() ||
 307                      par_language->babel() != outer_language->babel()) &&
 308                     !par_language->babel().empty()) {
 309                         // If we're inside an inset, and that inset is within an \L or \R
 310                         // (or equivalents), then within the inset, too, any opposite
 311                         // language paragraph should appear within an \L or \R (in addition
 312                         // to, outside of, the normal language switch commands).
 313                         // This behavior is not correct for ArabTeX, though.
 314                         if (    // not for ArabTeX
 315                                         (par_language->lang() != "arabic_arabtex" &&
 316                                          outer_language->lang() != "arabic_arabtex") &&
 317                                         // are we in an inset?
 318                                         runparams.local_font != 0 &&
 319                                         // is the inset within an \L or \R?
 320                                         //
 321                                         // FIXME: currently, we don't check this; this means that
 322                                         // we'll have unnnecessary \L and \R commands, but that
 323                                         // doesn't seem to hurt (though latex will complain)
 324                                         //
 325                                         // is this paragraph in the opposite direction?
 326                                         runparams.local_font->isRightToLeft() !=
 327                                                 par_language->rightToLeft()
 328                                 ) {
 329                                 // FIXME: I don't have a working copy of the Arabi package, so
 330                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 331                                 // or not...
 332                                 if (par_language->lang() == "farsi")
 333                                         os << "\\textFR{";
 334                                 else if (outer_language->lang() == "farsi")
 335                                         os << "\\textLR{";
 336                                 else if (par_language->lang() == "arabic_arabi")
 337                                         os << "\\textAR{";
 338                                 else if (outer_language->lang() == "arabic_arabi")
 339                                         os << "\\textLR{";
 340                                 // remaining RTL languages currently is hebrew
 341                                 else if (par_language->rightToLeft())
 342                                         os << "\\R{";
 343                                 else
 344                                         os << "\\L{";
 345                         }
 346                         os << from_ascii(subst(
 347                                 lyxrc.language_command_begin,
 348                                 "$$lang",
 349                                 par_language->babel()))
 350                            << '\n';
 351                         texrow.newline();
 352                 }
 353         }
 354
 355         // Switch file encoding if necessary; no need to do this for "default"
 356         // encoding, since this only affects the position of the outputted
 357         // \inputencoding command; the encoding switch will occur when necessary
 358         if (bparams.inputenc == "auto" &&
 359             runparams.encoding->package() == Encoding::inputenc) {
 360                 // Look ahead for future encoding changes.
 361                 // We try to output them at the beginning of the paragraph,
 362                 // since the \inputencoding command is not allowed e.g. in
 363                 // sections.
 364                 for (pos_type i = 0; i < pit->size(); ++i) {
 365                         char_type const c = pit->getChar(i);
 366                         if (c < 0x80)
 367                                 continue;
 368                         if (pit->isInset(i))
 369                                 break;
 370                         // All characters before c are in the ASCII range, and
 371                         // c is non-ASCII (but no inset), so change the
 372                         // encoding to that required by the language of c.
 373                         Encoding const * const encoding =
 374                                 pit->getFontSettings(bparams, i).language()->encoding();
 375                         pair<bool, int> enc_switch = switchEncoding(os, bparams, false,
 376                                         *(runparams.encoding), *encoding);
 377                         if (encoding->package() == Encoding::inputenc && enc_switch.first) {
 378                                 runparams.encoding = encoding;
 379                                 if (enc_switch.second > 0) {
 380                                         os << '\n';
 381                                         texrow.newline();
 382                                 }
 383                         }
 384                         break;
 385                 }
 386         }
 387
 388         // In an inset with unlimited length (all in one row),
 389         // don't allow any special options in the paragraph
 390         if (!pit->forceDefaultParagraphs()) {
 391                 if (pit->params().startOfAppendix()) {
 392                         os << "\\appendix\n";
 393                         texrow.newline();
 394                 }
 395
 396                 if (!pit->params().spacing().isDefault()
 397                         && (pit == paragraphs.begin()
 398                             || !boost::prior(pit)->hasSameLayout(*pit)))
 399                 {
 400                         os << from_ascii(pit->params().spacing().writeEnvirBegin())
 401                             << '\n';
 402                         texrow.newline();
 403                 }
 404
 405                 if (style->isCommand()) {
 406                         os << '\n';
 407                         texrow.newline();
 408                 }
 409         }
 410
 411         switch (style->latextype) {
 412         case LATEX_COMMAND:
 413                 os << '\\' << from_ascii(style->latexname());
 414
 415                 // Separate handling of optional argument inset.
 416                 if (style->optionalargs > 0) {
 417                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 418                                                     style->optionalargs);
 419                         while (ret > 0) {
 420                                 texrow.newline();
 421                                 --ret;
 422                         }
 423                 }
 424                 else
 425                         os << from_ascii(style->latexparam());
 426                 break;
 427         case LATEX_ITEM_ENVIRONMENT:
 428         case LATEX_LIST_ENVIRONMENT:
 429                 os << "\\item ";
 430                 break;
 431         case LATEX_BIB_ENVIRONMENT:
 432                 // ignore this, the inset will write itself
 433                 break;
 434         default:
 435                 break;
 436         }
 437
 438         Font const outerfont =
 439                 outerFont(std::distance(paragraphs.begin(), pit),
 440                           paragraphs);
 441
 442         // FIXME UNICODE
 443         os << from_utf8(everypar);
 444         bool need_par = pit->simpleTeXOnePar(buf, bparams, outerfont,
 445                                              os, texrow, runparams);
 446
 447         // Make sure that \\par is done with the font of the last
 448         // character if this has another size as the default.
 449         // This is necessary because LaTeX (and LyX on the screen)
 450         // calculates the space between the baselines according
 451         // to this font. (Matthias)
 452         //
 453         // Is this really needed ? (Dekel)
 454         // We do not need to use to change the font for the last paragraph
 455         // or for a command.
 456
 457         Font const font =
 458                 (pit->empty()
 459                  ? pit->getLayoutFont(bparams, outerfont)
 460                  : pit->getFont(bparams, pit->size() - 1, outerfont));
 461
 462         bool is_command = style->isCommand();
 463
 464         if (style->resfont.size() != font.size()
 465             && boost::next(pit) != paragraphs.end()
 466             && !is_command) {
 467                 if (!need_par)
 468                         os << '{';
 469                 os << "\\" << from_ascii(font.latexSize()) << " \\par}";
 470         } else if (need_par) {
 471                 os << "\\par}";
 472         } else if (is_command)
 473                 os << '}';
 474
 475         bool pending_newline = false;
 476         switch (style->latextype) {
 477         case LATEX_ITEM_ENVIRONMENT:
 478         case LATEX_LIST_ENVIRONMENT:
 479                 if (boost::next(pit) != paragraphs.end()
 480                     && (pit->params().depth() < boost::next(pit)->params().depth()))
 481                         pending_newline = true;
 482                 break;
 483         case LATEX_ENVIRONMENT: {
 484                 // if its the last paragraph of the current environment
 485                 // skip it otherwise fall through
 486                 ParagraphList::const_iterator next = boost::next(pit);
 487
 488                 if (next != paragraphs.end()
 489                     && (next->layout() != pit->layout()
 490                         || next->params().depth() != pit->params().depth()))
 491                         break;
 492         }
 493
 494                 // fall through possible
 495         default:
 496                 // we don't need it for the last paragraph!!!
 497                 if (boost::next(pit) != paragraphs.end())
 498                         pending_newline = true;
 499         }
 500
 501         if (!pit->forceDefaultParagraphs()) {
 502                 if (!pit->params().spacing().isDefault()
 503                         && (boost::next(pit) == paragraphs.end()
 504                             || !boost::next(pit)->hasSameLayout(*pit)))
 505                 {
 506                         if (pending_newline) {
 507                                 os << '\n';
 508                                 texrow.newline();
 509                         }
 510                         os << from_ascii(pit->params().spacing().writeEnvirEnd());
 511                         pending_newline = true;
 512                 }
 513         }
 514
 515         // Closing the language is needed for the last paragraph; it is also
 516         // needed if we're within an \L or \R that we may have opened above (not
 517         // necessarily in this paragraph) and are about to close.
 518         bool closing_rtl_ltr_environment =
 519                 // not for ArabTeX
 520                 (par_language->lang() != "arabic_arabtex" &&
 521                  outer_language->lang() != "arabic_arabtex") &&
 522                 // have we opened and \L or \R environment?
 523                 runparams.local_font != 0 &&
 524                 runparams.local_font->isRightToLeft() != par_language->rightToLeft() &&
 525                 // are we about to close the language?
 526                 ((boost::next(pit) != paragraphs.end() &&
 527                   par_language->babel() !=
 528                         (boost::next(pit)->getParLanguage(bparams))->babel()) ||
 529                  (boost::next(pit) == paragraphs.end() &&
 530                   par_language->babel() != outer_language->babel()));
 531
 532         if (closing_rtl_ltr_environment || (boost::next(pit) == paragraphs.end()
 533             && par_language->babel() != outer_language->babel())) {
 534                 // Since \selectlanguage write the language to the aux file,
 535                 // we need to reset the language at the end of footnote or
 536                 // float.
 537
 538                 if (pending_newline) {
 539                         os << '\n';
 540                         texrow.newline();
 541                 }
 542                 if (lyxrc.language_command_end.empty()) {
 543                         if (!prev_language->babel().empty()) {
 544                                 os << from_ascii(subst(
 545                                         lyxrc.language_command_begin,
 546                                         "$$lang",
 547                                         prev_language->babel()));
 548                                 pending_newline = true;
 549                         }
 550                 } else if (!par_language->babel().empty()) {
 551                         os << from_ascii(subst(
 552                                 lyxrc.language_command_end,
 553                                 "$$lang",
 554                                 par_language->babel()));
 555                         pending_newline = true;
 556                 }
 557         }
 558         if (closing_rtl_ltr_environment)
 559                 os << "}";
 560
 561         if (pending_newline) {
 562                 os << '\n';
 563                 texrow.newline();
 564         }
 565
 566         // If this is the last paragraph, and a local_font was set upon entering
 567         // the inset, the encoding should be set back to that local_font's
 568         // encoding. We don't use switchEncoding(), because no explicit encoding
 569         // switch command is needed, since latex will automatically revert to it
 570         // when this inset closes.
 571         // This switch is only necessary if we're using "auto" or "default"
 572         // encoding.
 573         if (boost::next(pit) == paragraphs.end() && runparams_in.local_font != 0) {
 574                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
 575                 if (bparams.inputenc == "auto" || bparams.inputenc == "default")
 576                         os << setEncoding(runparams_in.encoding->iconvName());
 577
 578         }
 579         // Otherwise, the current encoding should be set for the next paragraph.
 580         else
 581                 runparams_in.encoding = runparams.encoding;
 582
 583
 584         // we don't need it for the last paragraph!!!
 585         // Note from JMarc: we will re-add a \n explicitely in
 586         // TeXEnvironment, because it is needed in this case
 587         if (boost::next(pit) != paragraphs.end()) {
 588                 os << '\n';
 589                 texrow.newline();
 590         }
 591
 592         if (boost::next(pit) != paragraphs.end()) {
 593                 LYXERR(Debug::LATEX) << "TeXOnePar...done " << &*boost::next(pit) << endl;
 594         }
 595
 596         return ++pit;
 597 }
 598
 599 } // anon namespace
 600
 601
 602 // LaTeX all paragraphs
 603 void latexParagraphs(Buffer const & buf,
 604                      ParagraphList const & paragraphs,
 605                      odocstream & os,
 606                      TexRow & texrow,
 607                      OutputParams const & runparams,
 608                      string const & everypar)
 609 {
 610         bool was_title = false;
 611         bool already_title = false;
 612         TextClass const & tclass = buf.params().getTextClass();
 613         ParagraphList::const_iterator par = paragraphs.begin();
 614         ParagraphList::const_iterator endpar = paragraphs.end();
 615
 616         BOOST_ASSERT(runparams.par_begin <= runparams.par_end);
 617         // if only part of the paragraphs will be outputed
 618         if (runparams.par_begin !=  runparams.par_end) {
 619                 par = boost::next(paragraphs.begin(), runparams.par_begin);
 620                 endpar = boost::next(paragraphs.begin(), runparams.par_end);
 621                 // runparams will be passed to nested paragraphs, so
 622                 // we have to reset the range parameters.
 623                 const_cast<OutputParams&>(runparams).par_begin = 0;
 624                 const_cast<OutputParams&>(runparams).par_end = 0;
 625         }
 626
 627         // if only_body
 628         while (par != endpar) {
 629                 ParagraphList::const_iterator lastpar = par;
 630                 // well we have to check if we are in an inset with unlimited
 631                 // length (all in one row) if that is true then we don't allow
 632                 // any special options in the paragraph and also we don't allow
 633                 // any environment other than the default layout of the
 634                 // text class to be valid!
 635                 if (!par->forceDefaultParagraphs()) {
 636                         LayoutPtr const & layout = par->layout();
 637
 638                         if (layout->intitle) {
 639                                 if (already_title) {
 640                                         lyxerr << "Error in latexParagraphs: You"
 641                                                 " should not mix title layouts"
 642                                                 " with normal ones." << endl;
 643                                 } else if (!was_title) {
 644                                         was_title = true;
 645                                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
 646                                                 os << "\\begin{"
 647                                                     << from_ascii(tclass.titlename())
 648                                                     << "}\n";
 649                                                 texrow.newline();
 650                                         }
 651                                 }
 652                         } else if (was_title && !already_title) {
 653                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 654                                         os << "\\end{" << from_ascii(tclass.titlename())
 655                                             << "}\n";
 656                                 }
 657                                 else {
 658                                         os << "\\" << from_ascii(tclass.titlename())
 659                                             << "\n";
 660                                 }
 661                                 texrow.newline();
 662                                 already_title = true;
 663                                 was_title = false;
 664                         }
 665
 666                         if (layout->is_environment) {
 667                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 668                                                 runparams, everypar);
 669                         } else if (layout->isEnvironment() ||
 670                                    !par->params().leftIndent().zero()) {
 671                                 par = TeXEnvironment(buf, paragraphs, par, os,
 672                                                      texrow, runparams);
 673                         } else {
 674                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 675                                                 runparams, everypar);
 676                         }
 677                 } else {
 678                         par = TeXOnePar(buf, paragraphs, par, os, texrow,
 679                                         runparams, everypar);
 680                 }
 681                 if (std::distance(lastpar, par) >= std::distance(lastpar, endpar))
 682                         break;
 683         }
 684         // It might be that we only have a title in this document
 685         if (was_title && !already_title) {
 686                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 687                         os << "\\end{" << from_ascii(tclass.titlename())
 688                             << "}\n";
 689                 }
 690                 else {
 691                         os << "\\" << from_ascii(tclass.titlename())
 692                             << "\n";
 693                                 }
 694                 texrow.newline();
 695         }
 696 }
 697
 698
 699 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
 700                    bool moving_arg, Encoding const & oldEnc,
 701                    Encoding const & newEnc)
 702 {
 703         if ((bparams.inputenc != "auto" && bparams.inputenc != "default")
 704                 || moving_arg)
 705                 return make_pair(false, 0);
 706
 707         // Do nothing if the encoding is unchanged.
 708         if (oldEnc.name() == newEnc.name())
 709                 return make_pair(false, 0);
 710
 711         // FIXME We ignore encoding switches from/to encodings that do
 712         // neither support the inputenc package nor the CJK package here.
 713         // This does of course only work in special cases (e.g. switch from
 714         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
 715         // but it is the best we can do
 716         if (oldEnc.package() == Encoding::none
 717                 || newEnc.package() == Encoding::none)
 718                 return make_pair(false, 0);
 719
 720         LYXERR(Debug::LATEX) << "Changing LaTeX encoding from "
 721                 << oldEnc.name() << " to "
 722                 << newEnc.name() << endl;
 723         os << setEncoding(newEnc.iconvName());
 724         if (bparams.inputenc == "default")
 725                 return make_pair(true, 0);
 726
 727         docstring const inputenc(from_ascii(newEnc.latexName()));
 728         switch (newEnc.package()) {
 729                 case Encoding::none:
 730                         // shouldn't ever reach here, see above
 731                         return make_pair(true, 0);
 732                 case Encoding::inputenc: {
 733                         int count = inputenc.length();
 734                         if (oldEnc.package() == Encoding::CJK) {
 735                                 os << "\\end{CJK}";
 736                                 count += 9;
 737                         }
 738                         os << "\\inputencoding{" << inputenc << '}';
 739                         return make_pair(true, count + 16);
 740                  }
 741                 case Encoding::CJK: {
 742                         int count = inputenc.length();
 743                         if (oldEnc.package() == Encoding::CJK) {
 744                                 os << "\\end{CJK}";
 745                                 count += 9;
 746                         }
 747                         os << "\\begin{CJK}{" << inputenc << "}{}";
 748                         return make_pair(true, count + 15);
 749                 }
 750         }
 751         // Dead code to avoid a warning:
 752         return make_pair(true, 0);
 753 }
 754
 755 } // namespace lyx