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 "TextClass.h"
  28 #include "TexRow.h"
  29 #include "VSpace.h"
  30
  31 #include "insets/InsetBibitem.h"
  32 #include "insets/InsetOptArg.h"
  33
  34 #include "support/lstrings.h"
  35
  36 #include <boost/next_prior.hpp>
  37
  38 namespace lyx {
  39
  40 using support::subst;
  41
  42 using std::endl;
  43 using std::string;
  44 using std::pair;
  45 using std::make_pair;
  46
  47
  48 namespace {
  49
  50 ParagraphList::const_iterator
  51 TeXEnvironment(Buffer const & buf,
  52                ParagraphList const & paragraphs,
  53                ParagraphList::const_iterator pit,
  54                odocstream & os, TexRow & texrow,
  55                OutputParams const & runparams);
  56
  57 ParagraphList::const_iterator
  58 TeXOnePar(Buffer const & buf,
  59           ParagraphList const & paragraphs,
  60           ParagraphList::const_iterator pit,
  61           odocstream & os, TexRow & texrow,
  62           OutputParams const & runparams,
  63           string const & everypar = string());
  64
  65
  66 ParagraphList::const_iterator
  67 TeXDeeper(Buffer const & buf,
  68           ParagraphList const & paragraphs,
  69           ParagraphList::const_iterator pit,
  70           odocstream & os, TexRow & texrow,
  71           OutputParams const & runparams)
  72 {
  73         LYXERR(Debug::LATEX, "TeXDeeper...     " << &*pit);
  74         ParagraphList::const_iterator par = pit;
  75
  76         while (par != paragraphs.end() &&
  77                      par->params().depth() == pit->params().depth()) {
  78                 if (par->layout()->isEnvironment()) {
  79                         par = TeXEnvironment(buf, paragraphs, par,
  80                                              os, texrow, runparams);
  81                 } else {
  82                         par = TeXOnePar(buf, paragraphs, par,
  83                                              os, texrow, runparams);
  84                 }
  85         }
  86         LYXERR(Debug::LATEX, "TeXDeeper...done ");
  87
  88         return par;
  89 }
  90
  91
  92 ParagraphList::const_iterator
  93 TeXEnvironment(Buffer const & buf,
  94                ParagraphList const & paragraphs,
  95                ParagraphList::const_iterator pit,
  96                odocstream & os, TexRow & texrow,
  97                OutputParams const & runparams)
  98 {
  99         LYXERR(Debug::LATEX, "TeXEnvironment...     " << &*pit);
 100
 101         BufferParams const & bparams = buf.params();
 102
 103         LayoutPtr const & style = pit->layout();
 104
 105         Language const * const par_language = pit->getParLanguage(bparams);
 106         Language const * const doc_language = bparams.language;
 107         Language const * const prev_par_language =
 108                 (pit != paragraphs.begin())
 109                 ? boost::prior(pit)->getParLanguage(bparams)
 110                 : doc_language;
 111         if (par_language->babel() != prev_par_language->babel()) {
 112
 113                 if (!lyxrc.language_command_end.empty() &&
 114                     prev_par_language->babel() != doc_language->babel() &&
 115                     !prev_par_language->babel().empty()) {
 116                         os << from_ascii(subst(
 117                                 lyxrc.language_command_end,
 118                                 "$$lang",
 119                                 prev_par_language->babel()))
 120                            << '\n';
 121                         texrow.newline();
 122                 }
 123
 124                 if ((lyxrc.language_command_end.empty() ||
 125                      par_language->babel() != doc_language->babel()) &&
 126                     !par_language->babel().empty()) {
 127                         os << from_ascii(subst(
 128                                 lyxrc.language_command_begin,
 129                                 "$$lang",
 130                                 par_language->babel()))
 131                            << '\n';
 132                         texrow.newline();
 133                 }
 134         }
 135
 136         bool leftindent_open = false;
 137         if (!pit->params().leftIndent().zero()) {
 138                 os << "\\begin{LyXParagraphLeftIndent}{"
 139                    << from_ascii(pit->params().leftIndent().asLatexString())
 140                    << "}\n";
 141                 texrow.newline();
 142                 leftindent_open = true;
 143         }
 144
 145         if (style->isEnvironment()) {
 146                 os << "\\begin{" << from_ascii(style->latexname()) << '}';
 147                 if (style->optionalargs > 0) {
 148                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 149                                                     style->optionalargs);
 150                         while (ret > 0) {
 151                                 texrow.newline();
 152                                 --ret;
 153                         }
 154                 }
 155                 if (style->latextype == LATEX_LIST_ENVIRONMENT) {
 156                         os << '{'
 157                            << pit->params().labelWidthString()
 158                            << "}\n";
 159                 } else if (style->labeltype == LABEL_BIBLIO) {
 160                         // ale970405
 161                         os << '{' << bibitemWidest(buf) << "}\n";
 162                 } else
 163                         os << from_ascii(style->latexparam()) << '\n';
 164                 texrow.newline();
 165         }
 166         ParagraphList::const_iterator par = pit;
 167         do {
 168                 par = TeXOnePar(buf, paragraphs, par, os, texrow, runparams);
 169
 170                 if (par == paragraphs.end()) {
 171                         // Make sure that the last paragraph is
 172                         // correctly terminated (because TeXOnePar does
 173                         // not add a \n in this case)
 174                         os << '\n';
 175                         texrow.newline();
 176                 } else if (par->params().depth() > pit->params().depth()) {
 177                         if (par->layout()->isParagraph()) {
 178                           // Thinko!
 179                           // How to handle this? (Lgb)
 180                           //&& !suffixIs(os, "\n\n")
 181                                   //) {
 182
 183                                 // There should be at least one '\n' already
 184                                 // but we need there to be two for Standard
 185                                 // paragraphs that are depth-increment'ed to be
 186                                 // output correctly.  However, tables can
 187                                 // also be paragraphs so don't adjust them.
 188                                 // ARRae
 189                                 // Thinkee:
 190                                 // Will it ever harm to have one '\n' too
 191                                 // many? i.e. that we sometimes will have
 192                                 // three in a row. (Lgb)
 193                                 os << '\n';
 194                                 texrow.newline();
 195                         }
 196                         par = TeXDeeper(buf, paragraphs, par, os, texrow,
 197                                         runparams);
 198                 }
 199         } while (par != paragraphs.end()
 200                  && par->layout() == pit->layout()
 201                  && par->params().depth() == pit->params().depth()
 202                  && par->params().leftIndent() == pit->params().leftIndent());
 203
 204         if (style->isEnvironment()) {
 205                 os << "\\end{" << from_ascii(style->latexname()) << "}\n";
 206                 texrow.newline();
 207         }
 208
 209         if (leftindent_open) {
 210                 os << "\\end{LyXParagraphLeftIndent}\n";
 211                 texrow.newline();
 212         }
 213
 214         if (par != paragraphs.end())
 215                 LYXERR(Debug::LATEX, "TeXEnvironment...done " << &*par);
 216
 217         return par;
 218 }
 219
 220 }
 221
 222
 223 int latexOptArgInsets(Buffer const & buf, Paragraph const & par,
 224                       odocstream & os, OutputParams const & runparams, int number)
 225 {
 226         int lines = 0;
 227
 228         InsetList::const_iterator it = par.insetList().begin();
 229         InsetList::const_iterator end = par.insetList().end();
 230         for (; it != end && number > 0 ; ++it) {
 231                 if (it->inset->lyxCode() == OPTARG_CODE) {
 232                         InsetOptArg * ins =
 233                                 static_cast<InsetOptArg *>(it->inset);
 234                         lines += ins->latexOptional(buf, os, runparams);
 235                         --number;
 236                 }
 237         }
 238         return lines;
 239 }
 240
 241
 242 namespace {
 243
 244 ParagraphList::const_iterator
 245 TeXOnePar(Buffer const & buf,
 246           ParagraphList const & paragraphs,
 247           ParagraphList::const_iterator pit,
 248           odocstream & os, TexRow & texrow,
 249           OutputParams const & runparams_in,
 250           string const & everypar)
 251 {
 252         LYXERR(Debug::LATEX, "TeXOnePar...     " << &*pit << " '"
 253                 << everypar << "'");
 254         BufferParams const & bparams = buf.params();
 255         LayoutPtr style;
 256
 257         if (runparams_in.verbatim) {
 258                 int const dist = std::distance(paragraphs.begin(), pit);
 259                 Font const outerfont = outerFont(dist, paragraphs);
 260
 261                 // No newline if only one paragraph in this lyxtext
 262                 if (dist > 0) {
 263                         os << '\n';
 264                         texrow.newline();
 265                 }
 266
 267                 /*bool need_par = */ pit->latex(buf, bparams, outerfont,
 268                         os, texrow, runparams_in);
 269
 270                 return ++pit;
 271         }
 272
 273         // In an inset with unlimited length (all in one row),
 274         // force layout to default
 275         if (!pit->forceDefaultParagraphs())
 276                 style = pit->layout();
 277         else
 278                 style = bparams.getTextClass().defaultLayout();
 279
 280         OutputParams runparams = runparams_in;
 281         runparams.moving_arg |= style->needprotect;
 282
 283         // This paragraph's language
 284         Language const * const par_language = pit->getParLanguage(bparams);
 285         // The document's language
 286         Language const * const doc_language = bparams.language;
 287         // The language that was in effect when the environemnt this paragraph is
 288         // inside of was opened
 289         Language const * const outer_language =
 290                 (runparams.local_font != 0) ?
 291                         runparams.local_font->language() : doc_language;
 292         // The previous language that was in effect is either the language of
 293         // the previous paragraph, if there is one, or else the outer language
 294         // if there is no previous paragraph
 295         Language const * const prev_language =
 296                 (pit != paragraphs.begin()) ?
 297                         boost::prior(pit)->getParLanguage(bparams) : outer_language;
 298
 299         if (par_language->babel() != prev_language->babel()
 300             // check if we already put language command in TeXEnvironment()
 301             && !(style->isEnvironment()
 302                  && (pit == paragraphs.begin() ||
 303                      (boost::prior(pit)->layout() != pit->layout() &&
 304                       boost::prior(pit)->getDepth() <= pit->getDepth())
 305                      || boost::prior(pit)->getDepth() < pit->getDepth())))
 306         {
 307                 if (!lyxrc.language_command_end.empty() &&
 308                     prev_language->babel() != outer_language->babel() &&
 309                     !prev_language->babel().empty())
 310                 {
 311                         os << from_ascii(subst(lyxrc.language_command_end,
 312                                 "$$lang",
 313                                 prev_language->babel()))
 314                            << '\n';
 315                         texrow.newline();
 316                 }
 317
 318                 // We need to open a new language if we couldn't close the previous
 319                 // one (because there's no language_command_end); and even if we closed
 320                 // the previous one, if the current language is different than the
 321                 // outer_language (which is currently in effect once the previous one
 322                 // is closed).
 323                 if ((lyxrc.language_command_end.empty() ||
 324                      par_language->babel() != outer_language->babel()) &&
 325                     !par_language->babel().empty()) {
 326                         // If we're inside an inset, and that inset is within an \L or \R
 327                         // (or equivalents), then within the inset, too, any opposite
 328                         // language paragraph should appear within an \L or \R (in addition
 329                         // to, outside of, the normal language switch commands).
 330                         // This behavior is not correct for ArabTeX, though.
 331                         if (    // not for ArabTeX
 332                                         (par_language->lang() != "arabic_arabtex" &&
 333                                          outer_language->lang() != "arabic_arabtex") &&
 334                                         // are we in an inset?
 335                                         runparams.local_font != 0 &&
 336                                         // is the inset within an \L or \R?
 337                                         //
 338                                         // FIXME: currently, we don't check this; this means that
 339                                         // we'll have unnnecessary \L and \R commands, but that
 340                                         // doesn't seem to hurt (though latex will complain)
 341                                         //
 342                                         // is this paragraph in the opposite direction?
 343                                         runparams.local_font->isRightToLeft() !=
 344                                                 par_language->rightToLeft()
 345                                 ) {
 346                                 // FIXME: I don't have a working copy of the Arabi package, so
 347                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 348                                 // or not...
 349                                 if (par_language->lang() == "farsi")
 350                                         os << "\\textFR{";
 351                                 else if (outer_language->lang() == "farsi")
 352                                         os << "\\textLR{";
 353                                 else if (par_language->lang() == "arabic_arabi")
 354                                         os << "\\textAR{";
 355                                 else if (outer_language->lang() == "arabic_arabi")
 356                                         os << "\\textLR{";
 357                                 // remaining RTL languages currently is hebrew
 358                                 else if (par_language->rightToLeft())
 359                                         os << "\\R{";
 360                                 else
 361                                         os << "\\L{";
 362                         }
 363                         os << from_ascii(subst(
 364                                 lyxrc.language_command_begin,
 365                                 "$$lang",
 366                                 par_language->babel()))
 367                            << '\n';
 368                         texrow.newline();
 369                 }
 370         }
 371
 372         // Switch file encoding if necessary; no need to do this for "default"
 373         // encoding, since this only affects the position of the outputted
 374         // \inputencoding command; the encoding switch will occur when necessary
 375         if (bparams.inputenc == "auto" &&
 376             runparams.encoding->package() == Encoding::inputenc) {
 377                 // Look ahead for future encoding changes.
 378                 // We try to output them at the beginning of the paragraph,
 379                 // since the \inputencoding command is not allowed e.g. in
 380                 // sections.
 381                 for (pos_type i = 0; i < pit->size(); ++i) {
 382                         char_type const c = pit->getChar(i);
 383                         if (c < 0x80)
 384                                 continue;
 385                         if (pit->isInset(i))
 386                                 break;
 387                         // All characters before c are in the ASCII range, and
 388                         // c is non-ASCII (but no inset), so change the
 389                         // encoding to that required by the language of c.
 390                         Encoding const * const encoding =
 391                                 pit->getFontSettings(bparams, i).language()->encoding();
 392                         pair<bool, int> enc_switch = switchEncoding(os, bparams, false,
 393                                         *(runparams.encoding), *encoding);
 394                         if (encoding->package() == Encoding::inputenc && enc_switch.first) {
 395                                 runparams.encoding = encoding;
 396                                 if (enc_switch.second > 0) {
 397                                         os << '\n';
 398                                         texrow.newline();
 399                                 }
 400                         }
 401                         break;
 402                 }
 403         }
 404
 405         // In an inset with unlimited length (all in one row),
 406         // don't allow any special options in the paragraph
 407         if (!pit->forceDefaultParagraphs()) {
 408                 if (pit->params().startOfAppendix()) {
 409                         os << "\\appendix\n";
 410                         texrow.newline();
 411                 }
 412
 413                 if (!pit->params().spacing().isDefault()
 414                         && (pit == paragraphs.begin()
 415                             || !boost::prior(pit)->hasSameLayout(*pit)))
 416                 {
 417                         os << from_ascii(pit->params().spacing().writeEnvirBegin())
 418                             << '\n';
 419                         texrow.newline();
 420                 }
 421
 422                 if (style->isCommand()) {
 423                         os << '\n';
 424                         texrow.newline();
 425                 }
 426         }
 427
 428         switch (style->latextype) {
 429         case LATEX_COMMAND:
 430                 os << '\\' << from_ascii(style->latexname());
 431
 432                 // Separate handling of optional argument inset.
 433                 if (style->optionalargs > 0) {
 434                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 435                                                     style->optionalargs);
 436                         while (ret > 0) {
 437                                 texrow.newline();
 438                                 --ret;
 439                         }
 440                 }
 441                 else
 442                         os << from_ascii(style->latexparam());
 443                 break;
 444         case LATEX_ITEM_ENVIRONMENT:
 445         case LATEX_LIST_ENVIRONMENT:
 446                 os << "\\item ";
 447                 break;
 448         case LATEX_BIB_ENVIRONMENT:
 449                 // ignore this, the inset will write itself
 450                 break;
 451         default:
 452                 break;
 453         }
 454
 455         Font const outerfont =
 456                 outerFont(std::distance(paragraphs.begin(), pit),
 457                           paragraphs);
 458
 459         // FIXME UNICODE
 460         os << from_utf8(everypar);
 461         bool need_par = pit->latex(buf, bparams, outerfont,
 462                                              os, texrow, runparams);
 463
 464         // Make sure that \\par is done with the font of the last
 465         // character if this has another size as the default.
 466         // This is necessary because LaTeX (and LyX on the screen)
 467         // calculates the space between the baselines according
 468         // to this font. (Matthias)
 469         //
 470         // Is this really needed ? (Dekel)
 471         // We do not need to use to change the font for the last paragraph
 472         // or for a command.
 473
 474         Font const font =
 475                 (pit->empty()
 476                  ? pit->getLayoutFont(bparams, outerfont)
 477                  : pit->getFont(bparams, pit->size() - 1, outerfont));
 478
 479         bool is_command = style->isCommand();
 480
 481         if (style->resfont.size() != font.fontInfo().size()
 482             && boost::next(pit) != paragraphs.end()
 483             && !is_command) {
 484                 if (!need_par)
 485                         os << '{';
 486                 os << "\\" << from_ascii(font.latexSize()) << " \\par}";
 487         } else if (need_par) {
 488                 os << "\\par}";
 489         } else if (is_command)
 490                 os << '}';
 491
 492         bool pending_newline = false;
 493         switch (style->latextype) {
 494         case LATEX_ITEM_ENVIRONMENT:
 495         case LATEX_LIST_ENVIRONMENT:
 496                 if (boost::next(pit) != paragraphs.end()
 497                     && (pit->params().depth() < boost::next(pit)->params().depth()))
 498                         pending_newline = true;
 499                 break;
 500         case LATEX_ENVIRONMENT: {
 501                 // if its the last paragraph of the current environment
 502                 // skip it otherwise fall through
 503                 ParagraphList::const_iterator next = boost::next(pit);
 504
 505                 if (next != paragraphs.end()
 506                     && (next->layout() != pit->layout()
 507                         || next->params().depth() != pit->params().depth()))
 508                         break;
 509         }
 510
 511                 // fall through possible
 512         default:
 513                 // we don't need it for the last paragraph!!!
 514                 if (boost::next(pit) != paragraphs.end())
 515                         pending_newline = true;
 516         }
 517
 518         if (!pit->forceDefaultParagraphs()) {
 519                 if (!pit->params().spacing().isDefault()
 520                         && (boost::next(pit) == paragraphs.end()
 521                             || !boost::next(pit)->hasSameLayout(*pit)))
 522                 {
 523                         if (pending_newline) {
 524                                 os << '\n';
 525                                 texrow.newline();
 526                         }
 527                         os << from_ascii(pit->params().spacing().writeEnvirEnd());
 528                         pending_newline = true;
 529                 }
 530         }
 531
 532         // Closing the language is needed for the last paragraph; it is also
 533         // needed if we're within an \L or \R that we may have opened above (not
 534         // necessarily in this paragraph) and are about to close.
 535         bool closing_rtl_ltr_environment =
 536                 // not for ArabTeX
 537                 (par_language->lang() != "arabic_arabtex" &&
 538                  outer_language->lang() != "arabic_arabtex") &&
 539                 // have we opened and \L or \R environment?
 540                 runparams.local_font != 0 &&
 541                 runparams.local_font->isRightToLeft() != par_language->rightToLeft() &&
 542                 // are we about to close the language?
 543                 ((boost::next(pit) != paragraphs.end() &&
 544                   par_language->babel() !=
 545                         (boost::next(pit)->getParLanguage(bparams))->babel()) ||
 546                  (boost::next(pit) == paragraphs.end() &&
 547                   par_language->babel() != outer_language->babel()));
 548
 549         if (closing_rtl_ltr_environment || (boost::next(pit) == paragraphs.end()
 550             && par_language->babel() != outer_language->babel())) {
 551                 // Since \selectlanguage write the language to the aux file,
 552                 // we need to reset the language at the end of footnote or
 553                 // float.
 554
 555                 if (pending_newline) {
 556                         os << '\n';
 557                         texrow.newline();
 558                 }
 559                 if (lyxrc.language_command_end.empty()) {
 560                         if (!prev_language->babel().empty()) {
 561                                 os << from_ascii(subst(
 562                                         lyxrc.language_command_begin,
 563                                         "$$lang",
 564                                         prev_language->babel()));
 565                                 pending_newline = true;
 566                         }
 567                 } else if (!par_language->babel().empty()) {
 568                         os << from_ascii(subst(
 569                                 lyxrc.language_command_end,
 570                                 "$$lang",
 571                                 par_language->babel()));
 572                         pending_newline = true;
 573                 }
 574         }
 575         if (closing_rtl_ltr_environment)
 576                 os << "}";
 577
 578         if (pending_newline) {
 579                 os << '\n';
 580                 texrow.newline();
 581         }
 582
 583         // If this is the last paragraph, and a local_font was set upon entering
 584         // the inset, the encoding should be set back to that local_font's
 585         // encoding. We don't use switchEncoding(), because no explicit encoding
 586         // switch command is needed, since latex will automatically revert to it
 587         // when this inset closes.
 588         // This switch is only necessary if we're using "auto" or "default"
 589         // encoding.
 590         if (boost::next(pit) == paragraphs.end() && runparams_in.local_font != 0) {
 591                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
 592                 if (bparams.inputenc == "auto" || bparams.inputenc == "default")
 593                         os << setEncoding(runparams_in.encoding->iconvName());
 594
 595         }
 596         // Otherwise, the current encoding should be set for the next paragraph.
 597         else
 598                 runparams_in.encoding = runparams.encoding;
 599
 600
 601         // we don't need it for the last paragraph!!!
 602         // Note from JMarc: we will re-add a \n explicitely in
 603         // TeXEnvironment, because it is needed in this case
 604         if (boost::next(pit) != paragraphs.end()) {
 605                 os << '\n';
 606                 texrow.newline();
 607         }
 608
 609         if (boost::next(pit) != paragraphs.end())
 610                 LYXERR(Debug::LATEX, "TeXOnePar...done " << &*boost::next(pit));
 611
 612         return ++pit;
 613 }
 614
 615 } // anon namespace
 616
 617
 618 // LaTeX all paragraphs
 619 void latexParagraphs(Buffer const & buf,
 620                      ParagraphList const & paragraphs,
 621                      odocstream & os,
 622                      TexRow & texrow,
 623                      OutputParams const & runparams,
 624                      string const & everypar)
 625 {
 626         bool was_title = false;
 627         bool already_title = false;
 628         TextClass const & tclass = buf.params().getTextClass();
 629         ParagraphList::const_iterator par = paragraphs.begin();
 630         ParagraphList::const_iterator endpar = paragraphs.end();
 631
 632         BOOST_ASSERT(runparams.par_begin <= runparams.par_end);
 633         // if only part of the paragraphs will be outputed
 634         if (runparams.par_begin !=  runparams.par_end) {
 635                 par = boost::next(paragraphs.begin(), runparams.par_begin);
 636                 endpar = boost::next(paragraphs.begin(), runparams.par_end);
 637                 // runparams will be passed to nested paragraphs, so
 638                 // we have to reset the range parameters.
 639                 const_cast<OutputParams&>(runparams).par_begin = 0;
 640                 const_cast<OutputParams&>(runparams).par_end = 0;
 641         }
 642
 643         // if only_body
 644         while (par != endpar) {
 645                 ParagraphList::const_iterator lastpar = par;
 646                 // well we have to check if we are in an inset with unlimited
 647                 // length (all in one row) if that is true then we don't allow
 648                 // any special options in the paragraph and also we don't allow
 649                 // any environment other than the default layout of the
 650                 // text class to be valid!
 651                 if (!par->forceDefaultParagraphs()) {
 652                         LayoutPtr const & layout = par->layout();
 653
 654                         if (layout->intitle) {
 655                                 if (already_title) {
 656                                         lyxerr << "Error in latexParagraphs: You"
 657                                                 " should not mix title layouts"
 658                                                 " with normal ones." << endl;
 659                                 } else if (!was_title) {
 660                                         was_title = true;
 661                                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
 662                                                 os << "\\begin{"
 663                                                     << from_ascii(tclass.titlename())
 664                                                     << "}\n";
 665                                                 texrow.newline();
 666                                         }
 667                                 }
 668                         } else if (was_title && !already_title) {
 669                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 670                                         os << "\\end{" << from_ascii(tclass.titlename())
 671                                             << "}\n";
 672                                 }
 673                                 else {
 674                                         os << "\\" << from_ascii(tclass.titlename())
 675                                             << "\n";
 676                                 }
 677                                 texrow.newline();
 678                                 already_title = true;
 679                                 was_title = false;
 680                         }
 681
 682                         if (layout->is_environment) {
 683                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 684                                                 runparams, everypar);
 685                         } else if (layout->isEnvironment() ||
 686                                    !par->params().leftIndent().zero()) {
 687                                 par = TeXEnvironment(buf, paragraphs, par, os,
 688                                                      texrow, runparams);
 689                         } else {
 690                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 691                                                 runparams, everypar);
 692                         }
 693                 } else {
 694                         par = TeXOnePar(buf, paragraphs, par, os, texrow,
 695                                         runparams, everypar);
 696                 }
 697                 if (std::distance(lastpar, par) >= std::distance(lastpar, endpar))
 698                         break;
 699         }
 700         // It might be that we only have a title in this document
 701         if (was_title && !already_title) {
 702                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 703                         os << "\\end{" << from_ascii(tclass.titlename())
 704                             << "}\n";
 705                 }
 706                 else {
 707                         os << "\\" << from_ascii(tclass.titlename())
 708                             << "\n";
 709                                 }
 710                 texrow.newline();
 711         }
 712 }
 713
 714
 715 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
 716                    bool moving_arg, Encoding const & oldEnc,
 717                    Encoding const & newEnc)
 718 {
 719         if ((bparams.inputenc != "auto" && bparams.inputenc != "default")
 720                 || moving_arg)
 721                 return make_pair(false, 0);
 722
 723         // Do nothing if the encoding is unchanged.
 724         if (oldEnc.name() == newEnc.name())
 725                 return make_pair(false, 0);
 726
 727         // FIXME We ignore encoding switches from/to encodings that do
 728         // neither support the inputenc package nor the CJK package here.
 729         // This does of course only work in special cases (e.g. switch from
 730         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
 731         // but it is the best we can do
 732         if (oldEnc.package() == Encoding::none
 733                 || newEnc.package() == Encoding::none)
 734                 return make_pair(false, 0);
 735
 736         LYXERR(Debug::LATEX, "Changing LaTeX encoding from "
 737                 << oldEnc.name() << " to " << newEnc.name());
 738         os << setEncoding(newEnc.iconvName());
 739         if (bparams.inputenc == "default")
 740                 return make_pair(true, 0);
 741
 742         docstring const inputenc = from_ascii(newEnc.latexName());
 743         switch (newEnc.package()) {
 744                 case Encoding::none:
 745                         // shouldn't ever reach here, see above
 746                         return make_pair(true, 0);
 747                 case Encoding::inputenc: {
 748                         int count = inputenc.length();
 749                         if (oldEnc.package() == Encoding::CJK) {
 750                                 os << "\\end{CJK}";
 751                                 count += 9;
 752                         }
 753                         os << "\\inputencoding{" << inputenc << '}';
 754                         return make_pair(true, count + 16);
 755                 }
 756                 case Encoding::CJK: {
 757                         int count = inputenc.length();
 758                         if (oldEnc.package() == Encoding::CJK) {
 759                                 os << "\\end{CJK}";
 760                                 count += 9;
 761                         }
 762                         os << "\\begin{CJK}{" << inputenc << "}{}";
 763                         return make_pair(true, count + 15);
 764                 }
 765         }
 766         // Dead code to avoid a warning:
 767         return make_pair(true, 0);
 768 }
 769
 770 } // namespace lyx