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