src/output_latex.cpp

   1 /**
   2  * \file output_latex.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars Gullik Bjønnes
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "output_latex.h"
  14
  15 #include "Buffer.h"
  16 #include "BufferParams.h"
  17 #include "debug.h"
  18 #include "Encoding.h"
  19 #include "InsetList.h"
  20 #include "Language.h"
  21 #include "Layout.h"
  22 #include "LyXRC.h"
  23 #include "OutputParams.h"
  24 #include "Paragraph.h"
  25 #include "paragraph_funcs.h"
  26 #include "ParagraphParameters.h"
  27 #include "TexRow.h"
  28 #include "VSpace.h"
  29
  30 #include "insets/InsetBibitem.h"
  31 #include "insets/InsetOptArg.h"
  32
  33 #include "support/lstrings.h"
  34
  35 #include <boost/next_prior.hpp>
  36
  37 namespace lyx {
  38
  39 using support::subst;
  40
  41 using std::endl;
  42 using std::string;
  43 using std::pair;
  44 using std::make_pair;
  45
  46
  47 namespace {
  48
  49 ParagraphList::const_iterator
  50 TeXEnvironment(Buffer const & buf,
  51                ParagraphList const & paragraphs,
  52                ParagraphList::const_iterator pit,
  53                odocstream & os, TexRow & texrow,
  54                OutputParams const & runparams);
  55
  56 ParagraphList::const_iterator
  57 TeXOnePar(Buffer const & buf,
  58           ParagraphList const & paragraphs,
  59           ParagraphList::const_iterator pit,
  60           odocstream & os, TexRow & texrow,
  61           OutputParams const & runparams,
  62           string const & everypar = string());
  63
  64
  65 ParagraphList::const_iterator
  66 TeXDeeper(Buffer const & buf,
  67           ParagraphList const & paragraphs,
  68           ParagraphList::const_iterator pit,
  69           odocstream & os, TexRow & texrow,
  70           OutputParams const & runparams)
  71 {
  72         LYXERR(Debug::LATEX) << "TeXDeeper...     " << &*pit << endl;
  73         ParagraphList::const_iterator par = pit;
  74
  75         while (par != paragraphs.end() &&
  76                      par->params().depth() == pit->params().depth()) {
  77                 if (par->layout()->isEnvironment()) {
  78                         par = TeXEnvironment(buf, paragraphs, par,
  79                                              os, texrow, runparams);
  80                 } else {
  81                         par = TeXOnePar(buf, paragraphs, par,
  82                                              os, texrow, runparams);
  83                 }
  84         }
  85         LYXERR(Debug::LATEX) << "TeXDeeper...done " << endl;
  86
  87         return par;
  88 }
  89
  90
  91 ParagraphList::const_iterator
  92 TeXEnvironment(Buffer const & buf,
  93                ParagraphList const & paragraphs,
  94                ParagraphList::const_iterator pit,
  95                odocstream & os, TexRow & texrow,
  96                OutputParams const & runparams)
  97 {
  98         LYXERR(Debug::LATEX) << "TeXEnvironment...     " << &*pit << endl;
  99
 100         BufferParams const & bparams = buf.params();
 101
 102         LayoutPtr const & style = pit->layout();
 103
 104         Language const * const par_language = pit->getParLanguage(bparams);
 105         Language const * const doc_language = bparams.language;
 106         Language const * const prev_par_language =
 107                 (pit != paragraphs.begin())
 108                 ? boost::prior(pit)->getParLanguage(bparams)
 109                 : doc_language;
 110         if (par_language->babel() != prev_par_language->babel()) {
 111
 112                 if (!lyxrc.language_command_end.empty() &&
 113                     prev_par_language->babel() != doc_language->babel() &&
 114                     !prev_par_language->babel().empty()) {
 115                         os << from_ascii(subst(
 116                                 lyxrc.language_command_end,
 117                                 "$$lang",
 118                                 prev_par_language->babel()))
 119                            << '\n';
 120                         texrow.newline();
 121                 }
 122
 123                 if ((lyxrc.language_command_end.empty() ||
 124                      par_language->babel() != doc_language->babel()) &&
 125                     !par_language->babel().empty()) {
 126                         os << from_ascii(subst(
 127                                 lyxrc.language_command_begin,
 128                                 "$$lang",
 129                                 par_language->babel()))
 130                            << '\n';
 131                         texrow.newline();
 132                 }
 133         }
 134
 135         bool leftindent_open = false;
 136         if (!pit->params().leftIndent().zero()) {
 137                 os << "\\begin{LyXParagraphLeftIndent}{"
 138                    << from_ascii(pit->params().leftIndent().asLatexString())
 139                    << "}\n";
 140                 texrow.newline();
 141                 leftindent_open = true;
 142         }
 143
 144         if (style->isEnvironment()) {
 145                 os << "\\begin{" << from_ascii(style->latexname()) << '}';
 146                 if (style->optionalargs > 0) {
 147                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 148                                                     style->optionalargs);
 149                         while (ret > 0) {
 150                                 texrow.newline();
 151                                 --ret;
 152                         }
 153                 }
 154                 if (style->latextype == LATEX_LIST_ENVIRONMENT) {
 155                         os << '{'
 156                            << pit->params().labelWidthString()
 157                            << "}\n";
 158                 } else if (style->labeltype == LABEL_BIBLIO) {
 159                         // ale970405
 160                         os << '{' << bibitemWidest(buf) << "}\n";
 161                 } else
 162                         os << from_ascii(style->latexparam()) << '\n';
 163                 texrow.newline();
 164         }
 165         ParagraphList::const_iterator par = pit;
 166         do {
 167                 par = TeXOnePar(buf, paragraphs, par, os, texrow, runparams);
 168
 169                 if (par == paragraphs.end()) {
 170                         // Make sure that the last paragraph is
 171                         // correctly terminated (because TeXOnePar does
 172                         // not add a \n in this case)
 173                         os << '\n';
 174                         texrow.newline();
 175                 } else if (par->params().depth() > pit->params().depth()) {
 176                         if (par->layout()->isParagraph()) {
 177                           // Thinko!
 178                           // How to handle this? (Lgb)
 179                           //&& !suffixIs(os, "\n\n")
 180                                   //) {
 181
 182                                 // There should be at least one '\n' already
 183                                 // but we need there to be two for Standard
 184                                 // paragraphs that are depth-increment'ed to be
 185                                 // output correctly.  However, tables can
 186                                 // also be paragraphs so don't adjust them.
 187                                 // ARRae
 188                                 // Thinkee:
 189                                 // Will it ever harm to have one '\n' too
 190                                 // many? i.e. that we sometimes will have
 191                                 // three in a row. (Lgb)
 192                                 os << '\n';
 193                                 texrow.newline();
 194                         }
 195                         par = TeXDeeper(buf, paragraphs, par, os, texrow,
 196                                         runparams);
 197                 }
 198         } while (par != paragraphs.end()
 199                  && par->layout() == pit->layout()
 200                  && par->params().depth() == pit->params().depth()
 201                  && par->params().leftIndent() == pit->params().leftIndent());
 202
 203         if (style->isEnvironment()) {
 204                 os << "\\end{" << from_ascii(style->latexname()) << "}\n";
 205                 texrow.newline();
 206         }
 207
 208         if (leftindent_open) {
 209                 os << "\\end{LyXParagraphLeftIndent}\n";
 210                 texrow.newline();
 211         }
 212
 213         if (par != paragraphs.end()) {
 214                 LYXERR(Debug::LATEX) << "TeXEnvironment...done " << &*par << endl;
 215         }
 216         return par;
 217 }
 218
 219 }
 220
 221
 222 int latexOptArgInsets(Buffer const & buf, Paragraph const & par,
 223                       odocstream & os, OutputParams const & runparams, int number)
 224 {
 225         int lines = 0;
 226
 227         InsetList::const_iterator it = par.insetList().begin();
 228         InsetList::const_iterator end = par.insetList().end();
 229         for (; it != end && number > 0 ; ++it) {
 230                 if (it->inset->lyxCode() == OPTARG_CODE) {
 231                         InsetOptArg * ins =
 232                                 static_cast<InsetOptArg *>(it->inset);
 233                         lines += ins->latexOptional(buf, os, runparams);
 234                         --number;
 235                 }
 236         }
 237         return lines;
 238 }
 239
 240
 241 namespace {
 242
 243 ParagraphList::const_iterator
 244 TeXOnePar(Buffer const & buf,
 245           ParagraphList const & paragraphs,
 246           ParagraphList::const_iterator pit,
 247           odocstream & os, TexRow & texrow,
 248           OutputParams const & runparams_in,
 249           string const & everypar)
 250 {
 251         LYXERR(Debug::LATEX) << "TeXOnePar...     " << &*pit << " '"
 252                 << everypar << "'" << endl;
 253         BufferParams const & bparams = buf.params();
 254         LayoutPtr style;
 255
 256         if (runparams_in.verbatim) {
 257                 Font const outerfont =
 258                         outerFont(std::distance(paragraphs.begin(), pit),
 259                                   paragraphs);
 260
 261                 /*bool need_par = */ pit->latex(buf, bparams, outerfont,
 262                         os, texrow, runparams_in);
 263
 264                 os << '\n';
 265                 texrow.newline();
 266                 return ++pit;
 267         }
 268
 269         // In an inset with unlimited length (all in one row),
 270         // force layout to default
 271         if (!pit->forceDefaultParagraphs())
 272                 style = pit->layout();
 273         else
 274                 style = bparams.getTextClass().defaultLayout();
 275
 276         OutputParams runparams = runparams_in;
 277         runparams.moving_arg |= style->needprotect;
 278
 279         // This paragraph's language
 280         Language const * const par_language = pit->getParLanguage(bparams);
 281         // The document's language
 282         Language const * const doc_language = bparams.language;
 283         // The language that was in effect when the environemnt this paragraph is
 284         // inside of was opened
 285         Language const * const outer_language =
 286                 (runparams.local_font != 0) ?
 287                         runparams.local_font->language() : doc_language;
 288         // The previous language that was in effect is either the language of
 289         // the previous paragraph, if there is one, or else the outer language
 290         // if there is no previous paragraph
 291         Language const * const prev_language =
 292                 (pit != paragraphs.begin()) ?
 293                         boost::prior(pit)->getParLanguage(bparams) : outer_language;
 294
 295         if (par_language->babel() != prev_language->babel()
 296             // check if we already put language command in TeXEnvironment()
 297             && !(style->isEnvironment()
 298                  && (pit == paragraphs.begin() ||
 299                      (boost::prior(pit)->layout() != pit->layout() &&
 300                       boost::prior(pit)->getDepth() <= pit->getDepth())
 301                      || boost::prior(pit)->getDepth() < pit->getDepth())))
 302         {
 303                 if (!lyxrc.language_command_end.empty() &&
 304                     prev_language->babel() != outer_language->babel() &&
 305                     !prev_language->babel().empty())
 306                 {
 307                         os << from_ascii(subst(lyxrc.language_command_end,
 308                                 "$$lang",
 309                                 prev_language->babel()))
 310                            << '\n';
 311                         texrow.newline();
 312                 }
 313
 314                 // We need to open a new language if we couldn't close the previous
 315                 // one (because there's no language_command_end); and even if we closed
 316                 // the previous one, if the current language is different than the
 317                 // outer_language (which is currently in effect once the previous one
 318                 // is closed).
 319                 if ((lyxrc.language_command_end.empty() ||
 320                      par_language->babel() != outer_language->babel()) &&
 321                     !par_language->babel().empty()) {
 322                         // If we're inside an inset, and that inset is within an \L or \R
 323                         // (or equivalents), then within the inset, too, any opposite
 324                         // language paragraph should appear within an \L or \R (in addition
 325                         // to, outside of, the normal language switch commands).
 326                         // This behavior is not correct for ArabTeX, though.
 327                         if (    // not for ArabTeX
 328                                         (par_language->lang() != "arabic_arabtex" &&
 329                                          outer_language->lang() != "arabic_arabtex") &&
 330                                         // are we in an inset?
 331                                         runparams.local_font != 0 &&
 332                                         // is the inset within an \L or \R?
 333                                         //
 334                                         // FIXME: currently, we don't check this; this means that
 335                                         // we'll have unnnecessary \L and \R commands, but that
 336                                         // doesn't seem to hurt (though latex will complain)
 337                                         //
 338                                         // is this paragraph in the opposite direction?
 339                                         runparams.local_font->isRightToLeft() !=
 340                                                 par_language->rightToLeft()
 341                                 ) {
 342                                 // FIXME: I don't have a working copy of the Arabi package, so
 343                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 344                                 // or not...
 345                                 if (par_language->lang() == "farsi")
 346                                         os << "\\textFR{";
 347                                 else if (outer_language->lang() == "farsi")
 348                                         os << "\\textLR{";
 349                                 else if (par_language->lang() == "arabic_arabi")
 350                                         os << "\\textAR{";
 351                                 else if (outer_language->lang() == "arabic_arabi")
 352                                         os << "\\textLR{";
 353                                 // remaining RTL languages currently is hebrew
 354                                 else if (par_language->rightToLeft())
 355                                         os << "\\R{";
 356                                 else
 357                                         os << "\\L{";
 358                         }
 359                         os << from_ascii(subst(
 360                                 lyxrc.language_command_begin,
 361                                 "$$lang",
 362                                 par_language->babel()))
 363                            << '\n';
 364                         texrow.newline();
 365                 }
 366         }
 367
 368         // Switch file encoding if necessary; no need to do this for "default"
 369         // encoding, since this only affects the position of the outputted
 370         // \inputencoding command; the encoding switch will occur when necessary
 371         if (bparams.inputenc == "auto" &&
 372             runparams.encoding->package() == Encoding::inputenc) {
 373                 // Look ahead for future encoding changes.
 374                 // We try to output them at the beginning of the paragraph,
 375                 // since the \inputencoding command is not allowed e.g. in
 376                 // sections.
 377                 for (pos_type i = 0; i < pit->size(); ++i) {
 378                         char_type const c = pit->getChar(i);
 379                         if (c < 0x80)
 380                                 continue;
 381                         if (pit->isInset(i))
 382                                 break;
 383                         // All characters before c are in the ASCII range, and
 384                         // c is non-ASCII (but no inset), so change the
 385                         // encoding to that required by the language of c.
 386                         Encoding const * const encoding =
 387                                 pit->getFontSettings(bparams, i).language()->encoding();
 388                         pair<bool, int> enc_switch = switchEncoding(os, bparams, false,
 389                                         *(runparams.encoding), *encoding);
 390                         if (encoding->package() == Encoding::inputenc && enc_switch.first) {
 391                                 runparams.encoding = encoding;
 392                                 if (enc_switch.second > 0) {
 393                                         os << '\n';
 394                                         texrow.newline();
 395                                 }
 396                         }
 397                         break;
 398                 }
 399         }
 400
 401         // In an inset with unlimited length (all in one row),
 402         // don't allow any special options in the paragraph
 403         if (!pit->forceDefaultParagraphs()) {
 404                 if (pit->params().startOfAppendix()) {
 405                         os << "\\appendix\n";
 406                         texrow.newline();
 407                 }
 408
 409                 if (!pit->params().spacing().isDefault()
 410                         && (pit == paragraphs.begin()
 411                             || !boost::prior(pit)->hasSameLayout(*pit)))
 412                 {
 413                         os << from_ascii(pit->params().spacing().writeEnvirBegin())
 414                             << '\n';
 415                         texrow.newline();
 416                 }
 417
 418                 if (style->isCommand()) {
 419                         os << '\n';
 420                         texrow.newline();
 421                 }
 422         }
 423
 424         switch (style->latextype) {
 425         case LATEX_COMMAND:
 426                 os << '\\' << from_ascii(style->latexname());
 427
 428                 // Separate handling of optional argument inset.
 429                 if (style->optionalargs > 0) {
 430                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 431                                                     style->optionalargs);
 432                         while (ret > 0) {
 433                                 texrow.newline();
 434                                 --ret;
 435                         }
 436                 }
 437                 else
 438                         os << from_ascii(style->latexparam());
 439                 break;
 440         case LATEX_ITEM_ENVIRONMENT:
 441         case LATEX_LIST_ENVIRONMENT:
 442                 os << "\\item ";
 443                 break;
 444         case LATEX_BIB_ENVIRONMENT:
 445                 // ignore this, the inset will write itself
 446                 break;
 447         default:
 448                 break;
 449         }
 450
 451         Font const outerfont =
 452                 outerFont(std::distance(paragraphs.begin(), pit),
 453                           paragraphs);
 454
 455         // FIXME UNICODE
 456         os << from_utf8(everypar);
 457         bool need_par = pit->latex(buf, bparams, outerfont,
 458                                              os, texrow, runparams);
 459
 460         // Make sure that \\par is done with the font of the last
 461         // character if this has another size as the default.
 462         // This is necessary because LaTeX (and LyX on the screen)
 463         // calculates the space between the baselines according
 464         // to this font. (Matthias)
 465         //
 466         // Is this really needed ? (Dekel)
 467         // We do not need to use to change the font for the last paragraph
 468         // or for a command.
 469
 470         Font const font =
 471                 (pit->empty()
 472                  ? pit->getLayoutFont(bparams, outerfont)
 473                  : pit->getFont(bparams, pit->size() - 1, outerfont));
 474
 475         bool is_command = style->isCommand();
 476
 477         if (style->resfont.size() != font.fontInfo().size()
 478             && boost::next(pit) != paragraphs.end()
 479             && !is_command) {
 480                 if (!need_par)
 481                         os << '{';
 482                 os << "\\" << from_ascii(font.latexSize()) << " \\par}";
 483         } else if (need_par) {
 484                 os << "\\par}";
 485         } else if (is_command)
 486                 os << '}';
 487
 488         bool pending_newline = false;
 489         switch (style->latextype) {
 490         case LATEX_ITEM_ENVIRONMENT:
 491         case LATEX_LIST_ENVIRONMENT:
 492                 if (boost::next(pit) != paragraphs.end()
 493                     && (pit->params().depth() < boost::next(pit)->params().depth()))
 494                         pending_newline = true;
 495                 break;
 496         case LATEX_ENVIRONMENT: {
 497                 // if its the last paragraph of the current environment
 498                 // skip it otherwise fall through
 499                 ParagraphList::const_iterator next = boost::next(pit);
 500
 501                 if (next != paragraphs.end()
 502                     && (next->layout() != pit->layout()
 503                         || next->params().depth() != pit->params().depth()))
 504                         break;
 505         }
 506
 507                 // fall through possible
 508         default:
 509                 // we don't need it for the last paragraph!!!
 510                 if (boost::next(pit) != paragraphs.end())
 511                         pending_newline = true;
 512         }
 513
 514         if (!pit->forceDefaultParagraphs()) {
 515                 if (!pit->params().spacing().isDefault()
 516                         && (boost::next(pit) == paragraphs.end()
 517                             || !boost::next(pit)->hasSameLayout(*pit)))
 518                 {
 519                         if (pending_newline) {
 520                                 os << '\n';
 521                                 texrow.newline();
 522                         }
 523                         os << from_ascii(pit->params().spacing().writeEnvirEnd());
 524                         pending_newline = true;
 525                 }
 526         }
 527
 528         // Closing the language is needed for the last paragraph; it is also
 529         // needed if we're within an \L or \R that we may have opened above (not
 530         // necessarily in this paragraph) and are about to close.
 531         bool closing_rtl_ltr_environment =
 532                 // not for ArabTeX
 533                 (par_language->lang() != "arabic_arabtex" &&
 534                  outer_language->lang() != "arabic_arabtex") &&
 535                 // have we opened and \L or \R environment?
 536                 runparams.local_font != 0 &&
 537                 runparams.local_font->isRightToLeft() != par_language->rightToLeft() &&
 538                 // are we about to close the language?
 539                 ((boost::next(pit) != paragraphs.end() &&
 540                   par_language->babel() !=
 541                         (boost::next(pit)->getParLanguage(bparams))->babel()) ||
 542                  (boost::next(pit) == paragraphs.end() &&
 543                   par_language->babel() != outer_language->babel()));
 544
 545         if (closing_rtl_ltr_environment || (boost::next(pit) == paragraphs.end()
 546             && par_language->babel() != outer_language->babel())) {
 547                 // Since \selectlanguage write the language to the aux file,
 548                 // we need to reset the language at the end of footnote or
 549                 // float.
 550
 551                 if (pending_newline) {
 552                         os << '\n';
 553                         texrow.newline();
 554                 }
 555                 if (lyxrc.language_command_end.empty()) {
 556                         if (!prev_language->babel().empty()) {
 557                                 os << from_ascii(subst(
 558                                         lyxrc.language_command_begin,
 559                                         "$$lang",
 560                                         prev_language->babel()));
 561                                 pending_newline = true;
 562                         }
 563                 } else if (!par_language->babel().empty()) {
 564                         os << from_ascii(subst(
 565                                 lyxrc.language_command_end,
 566                                 "$$lang",
 567                                 par_language->babel()));
 568                         pending_newline = true;
 569                 }
 570         }
 571         if (closing_rtl_ltr_environment)
 572                 os << "}";
 573
 574         if (pending_newline) {
 575                 os << '\n';
 576                 texrow.newline();
 577         }
 578
 579         // If this is the last paragraph, and a local_font was set upon entering
 580         // the inset, the encoding should be set back to that local_font's
 581         // encoding. We don't use switchEncoding(), because no explicit encoding
 582         // switch command is needed, since latex will automatically revert to it
 583         // when this inset closes.
 584         // This switch is only necessary if we're using "auto" or "default"
 585         // encoding.
 586         if (boost::next(pit) == paragraphs.end() && runparams_in.local_font != 0) {
 587                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
 588                 if (bparams.inputenc == "auto" || bparams.inputenc == "default")
 589                         os << setEncoding(runparams_in.encoding->iconvName());
 590
 591         }
 592         // Otherwise, the current encoding should be set for the next paragraph.
 593         else
 594                 runparams_in.encoding = runparams.encoding;
 595
 596
 597         // we don't need it for the last paragraph!!!
 598         // Note from JMarc: we will re-add a \n explicitely in
 599         // TeXEnvironment, because it is needed in this case
 600         if (boost::next(pit) != paragraphs.end()) {
 601                 os << '\n';
 602                 texrow.newline();
 603         }
 604
 605         if (boost::next(pit) != paragraphs.end()) {
 606                 LYXERR(Debug::LATEX) << "TeXOnePar...done " << &*boost::next(pit) << endl;
 607         }
 608
 609         return ++pit;
 610 }
 611
 612 } // anon namespace
 613
 614
 615 // LaTeX all paragraphs
 616 void latexParagraphs(Buffer const & buf,
 617                      ParagraphList const & paragraphs,
 618                      odocstream & os,
 619                      TexRow & texrow,
 620                      OutputParams const & runparams,
 621                      string const & everypar)
 622 {
 623         bool was_title = false;
 624         bool already_title = false;
 625         TextClass const & tclass = buf.params().getTextClass();
 626         ParagraphList::const_iterator par = paragraphs.begin();
 627         ParagraphList::const_iterator endpar = paragraphs.end();
 628
 629         BOOST_ASSERT(runparams.par_begin <= runparams.par_end);
 630         // if only part of the paragraphs will be outputed
 631         if (runparams.par_begin !=  runparams.par_end) {
 632                 par = boost::next(paragraphs.begin(), runparams.par_begin);
 633                 endpar = boost::next(paragraphs.begin(), runparams.par_end);
 634                 // runparams will be passed to nested paragraphs, so
 635                 // we have to reset the range parameters.
 636                 const_cast<OutputParams&>(runparams).par_begin = 0;
 637                 const_cast<OutputParams&>(runparams).par_end = 0;
 638         }
 639
 640         // if only_body
 641         while (par != endpar) {
 642                 ParagraphList::const_iterator lastpar = par;
 643                 // well we have to check if we are in an inset with unlimited
 644                 // length (all in one row) if that is true then we don't allow
 645                 // any special options in the paragraph and also we don't allow
 646                 // any environment other than the default layout of the
 647                 // text class to be valid!
 648                 if (!par->forceDefaultParagraphs()) {
 649                         LayoutPtr const & layout = par->layout();
 650
 651                         if (layout->intitle) {
 652                                 if (already_title) {
 653                                         lyxerr << "Error in latexParagraphs: You"
 654                                                 " should not mix title layouts"
 655                                                 " with normal ones." << endl;
 656                                 } else if (!was_title) {
 657                                         was_title = true;
 658                                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
 659                                                 os << "\\begin{"
 660                                                     << from_ascii(tclass.titlename())
 661                                                     << "}\n";
 662                                                 texrow.newline();
 663                                         }
 664                                 }
 665                         } else if (was_title && !already_title) {
 666                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 667                                         os << "\\end{" << from_ascii(tclass.titlename())
 668                                             << "}\n";
 669                                 }
 670                                 else {
 671                                         os << "\\" << from_ascii(tclass.titlename())
 672                                             << "\n";
 673                                 }
 674                                 texrow.newline();
 675                                 already_title = true;
 676                                 was_title = false;
 677                         }
 678
 679                         if (layout->is_environment) {
 680                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 681                                                 runparams, everypar);
 682                         } else if (layout->isEnvironment() ||
 683                                    !par->params().leftIndent().zero()) {
 684                                 par = TeXEnvironment(buf, paragraphs, par, os,
 685                                                      texrow, runparams);
 686                         } else {
 687                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 688                                                 runparams, everypar);
 689                         }
 690                 } else {
 691                         par = TeXOnePar(buf, paragraphs, par, os, texrow,
 692                                         runparams, everypar);
 693                 }
 694                 if (std::distance(lastpar, par) >= std::distance(lastpar, endpar))
 695                         break;
 696         }
 697         // It might be that we only have a title in this document
 698         if (was_title && !already_title) {
 699                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 700                         os << "\\end{" << from_ascii(tclass.titlename())
 701                             << "}\n";
 702                 }
 703                 else {
 704                         os << "\\" << from_ascii(tclass.titlename())
 705                             << "\n";
 706                                 }
 707                 texrow.newline();
 708         }
 709 }
 710
 711
 712 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
 713                    bool moving_arg, Encoding const & oldEnc,
 714                    Encoding const & newEnc)
 715 {
 716         if ((bparams.inputenc != "auto" && bparams.inputenc != "default")
 717                 || moving_arg)
 718                 return make_pair(false, 0);
 719
 720         // Do nothing if the encoding is unchanged.
 721         if (oldEnc.name() == newEnc.name())
 722                 return make_pair(false, 0);
 723
 724         // FIXME We ignore encoding switches from/to encodings that do
 725         // neither support the inputenc package nor the CJK package here.
 726         // This does of course only work in special cases (e.g. switch from
 727         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
 728         // but it is the best we can do
 729         if (oldEnc.package() == Encoding::none
 730                 || newEnc.package() == Encoding::none)
 731                 return make_pair(false, 0);
 732
 733         LYXERR(Debug::LATEX) << "Changing LaTeX encoding from "
 734                 << oldEnc.name() << " to "
 735                 << newEnc.name() << endl;
 736         os << setEncoding(newEnc.iconvName());
 737         if (bparams.inputenc == "default")
 738                 return make_pair(true, 0);
 739
 740         docstring const inputenc(from_ascii(newEnc.latexName()));
 741         switch (newEnc.package()) {
 742                 case Encoding::none:
 743                         // shouldn't ever reach here, see above
 744                         return make_pair(true, 0);
 745                 case Encoding::inputenc: {
 746                         int count = inputenc.length();
 747                         if (oldEnc.package() == Encoding::CJK) {
 748                                 os << "\\end{CJK}";
 749                                 count += 9;
 750                         }
 751                         os << "\\inputencoding{" << inputenc << '}';
 752                         return make_pair(true, count + 16);
 753                  }
 754                 case Encoding::CJK: {
 755                         int count = inputenc.length();
 756                         if (oldEnc.package() == Encoding::CJK) {
 757                                 os << "\\end{CJK}";
 758                                 count += 9;
 759                         }
 760                         os << "\\begin{CJK}{" << inputenc << "}{}";
 761                         return make_pair(true, count + 15);
 762                 }
 763         }
 764         // Dead code to avoid a warning:
 765         return make_pair(true, 0);
 766 }
 767
 768 } // namespace lyx