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