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                                 "$$lang",
 119                                 prev_par_language->babel()))
 120                            // the '%' is necessary to prevent unwanted whitespace
 121                            << "%\n";
 122                         texrow.newline();
 123                 }
 124
 125                 if ((lyxrc.language_command_end.empty() ||
 126                      par_language->babel() != doc_language->babel()) &&
 127                     !par_language->babel().empty()) {
 128                         os << from_ascii(subst(
 129                                 lyxrc.language_command_begin,
 130                                 "$$lang",
 131                                 par_language->babel()))
 132                            // the '%' is necessary to prevent unwanted whitespace
 133                            << "%\n";
 134                         texrow.newline();
 135                 }
 136         }
 137
 138         bool leftindent_open = false;
 139         if (!pit->params().leftIndent().zero()) {
 140                 os << "\\begin{LyXParagraphLeftIndent}{"
 141                    << from_ascii(pit->params().leftIndent().asLatexString())
 142                    << "}\n";
 143                 texrow.newline();
 144                 leftindent_open = true;
 145         }
 146
 147         if (style->isEnvironment()) {
 148                 os << "\\begin{" << from_ascii(style->latexname()) << '}';
 149                 if (style->optionalargs > 0) {
 150                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 151                                                     style->optionalargs);
 152                         while (ret > 0) {
 153                                 texrow.newline();
 154                                 --ret;
 155                         }
 156                 }
 157                 if (style->latextype == LATEX_LIST_ENVIRONMENT) {
 158                         os << '{'
 159                            << pit->params().labelWidthString()
 160                            << "}\n";
 161                 } else if (style->labeltype == LABEL_BIBLIO) {
 162                         // ale970405
 163                         os << '{' << bibitemWidest(buf) << "}\n";
 164                 } else
 165                         os << from_ascii(style->latexparam()) << '\n';
 166                 texrow.newline();
 167         }
 168         ParagraphList::const_iterator par = pit;
 169         do {
 170                 par = TeXOnePar(buf, paragraphs, par, os, texrow, runparams);
 171
 172                 if (par == paragraphs.end()) {
 173                         // Make sure that the last paragraph is
 174                         // correctly terminated (because TeXOnePar does
 175                         // not add a \n in this case)
 176                         os << '\n';
 177                         texrow.newline();
 178                 } else if (par->params().depth() > pit->params().depth()) {
 179                         if (par->layout()->isParagraph()) {
 180                           // Thinko!
 181                           // How to handle this? (Lgb)
 182                           //&& !suffixIs(os, "\n\n")
 183                                   //) {
 184
 185                                 // There should be at least one '\n' already
 186                                 // but we need there to be two for Standard
 187                                 // paragraphs that are depth-increment'ed to be
 188                                 // output correctly.  However, tables can
 189                                 // also be paragraphs so don't adjust them.
 190                                 // ARRae
 191                                 // Thinkee:
 192                                 // Will it ever harm to have one '\n' too
 193                                 // many? i.e. that we sometimes will have
 194                                 // three in a row. (Lgb)
 195                                 os << '\n';
 196                                 texrow.newline();
 197                         }
 198                         par = TeXDeeper(buf, paragraphs, par, os, texrow,
 199                                         runparams);
 200                 }
 201         } while (par != paragraphs.end()
 202                  && par->layout() == pit->layout()
 203                  && par->params().depth() == pit->params().depth()
 204                  && par->params().leftIndent() == pit->params().leftIndent());
 205
 206         if (style->isEnvironment()) {
 207                 os << "\\end{" << from_ascii(style->latexname()) << "}\n";
 208                 texrow.newline();
 209         }
 210
 211         if (leftindent_open) {
 212                 os << "\\end{LyXParagraphLeftIndent}\n";
 213                 texrow.newline();
 214         }
 215
 216         if (par != paragraphs.end())
 217                 LYXERR(Debug::LATEX, "TeXEnvironment...done " << &*par);
 218
 219         return par;
 220 }
 221
 222 }
 223
 224
 225 int latexOptArgInsets(Buffer const & buf, Paragraph const & par,
 226                       odocstream & os, OutputParams const & runparams, int number)
 227 {
 228         int lines = 0;
 229
 230         InsetList::const_iterator it = par.insetList().begin();
 231         InsetList::const_iterator end = par.insetList().end();
 232         for (; it != end && number > 0 ; ++it) {
 233                 if (it->inset->lyxCode() == OPTARG_CODE) {
 234                         InsetOptArg * ins =
 235                                 static_cast<InsetOptArg *>(it->inset);
 236                         lines += ins->latexOptional(buf, os, runparams);
 237                         --number;
 238                 }
 239         }
 240         return lines;
 241 }
 242
 243
 244 namespace {
 245
 246 ParagraphList::const_iterator
 247 TeXOnePar(Buffer const & buf,
 248           ParagraphList const & paragraphs,
 249           ParagraphList::const_iterator pit,
 250           odocstream & os, TexRow & texrow,
 251           OutputParams const & runparams_in,
 252           string const & everypar)
 253 {
 254         LYXERR(Debug::LATEX, "TeXOnePar...     " << &*pit << " '"
 255                 << everypar << "'");
 256         BufferParams const & bparams = buf.params();
 257         LayoutPtr style;
 258
 259         if (runparams_in.verbatim) {
 260                 int const dist = std::distance(paragraphs.begin(), pit);
 261                 Font const outerfont = outerFont(dist, paragraphs);
 262
 263                 // No newline if only one paragraph in this lyxtext
 264                 if (dist > 0) {
 265                         os << '\n';
 266                         texrow.newline();
 267                 }
 268
 269                 /*bool need_par = */ pit->latex(buf, bparams, outerfont,
 270                         os, texrow, runparams_in);
 271
 272                 return ++pit;
 273         }
 274
 275         // In an inset with unlimited length (all in one row),
 276         // force layout to default
 277         if (!pit->forceDefaultParagraphs())
 278                 style = pit->layout();
 279         else
 280                 style = bparams.getTextClass().defaultLayout();
 281
 282         OutputParams runparams = runparams_in;
 283         runparams.moving_arg |= style->needprotect;
 284
 285         // This paragraph's language
 286         Language const * const par_language = pit->getParLanguage(bparams);
 287         // The document's language
 288         Language const * const doc_language = bparams.language;
 289         // The language that was in effect when the environment this paragraph is
 290         // inside of was opened
 291         Language const * const outer_language =
 292                 (runparams.local_font != 0) ?
 293                         runparams.local_font->language() : doc_language;
 294         // The previous language that was in effect is either the language of
 295         // the previous paragraph, if there is one, or else the outer language
 296         // if there is no previous paragraph
 297         Language const * const prev_language =
 298                 (pit != paragraphs.begin()) ?
 299                         boost::prior(pit)->getParLanguage(bparams) : outer_language;
 300
 301         if (par_language->babel() != prev_language->babel()
 302             // check if we already put language command in TeXEnvironment()
 303             && !(style->isEnvironment()
 304                  && (pit == paragraphs.begin() ||
 305                      (boost::prior(pit)->layout() != pit->layout() &&
 306                       boost::prior(pit)->getDepth() <= pit->getDepth())
 307                      || boost::prior(pit)->getDepth() < pit->getDepth())))
 308         {
 309                 if (!lyxrc.language_command_end.empty() &&
 310                     prev_language->babel() != outer_language->babel() &&
 311                     !prev_language->babel().empty())
 312                 {
 313                         os << from_ascii(subst(lyxrc.language_command_end,
 314                                 "$$lang",
 315                                 prev_language->babel()))
 316                            // the '%' is necessary to prevent unwanted whitespace
 317                            << "%\n";
 318                         texrow.newline();
 319                 }
 320
 321                 // We need to open a new language if we couldn't close the previous
 322                 // one (because there's no language_command_end); and even if we closed
 323                 // the previous one, if the current language is different than the
 324                 // outer_language (which is currently in effect once the previous one
 325                 // is closed).
 326                 if ((lyxrc.language_command_end.empty() ||
 327                      par_language->babel() != outer_language->babel()) &&
 328                     !par_language->babel().empty()) {
 329                         // If we're inside an inset, and that inset is within an \L or \R
 330                         // (or equivalents), then within the inset, too, any opposite
 331                         // language paragraph should appear within an \L or \R (in addition
 332                         // to, outside of, the normal language switch commands).
 333                         // This behavior is not correct for ArabTeX, though.
 334                         if (    // not for ArabTeX
 335                                         (par_language->lang() != "arabic_arabtex" &&
 336                                          outer_language->lang() != "arabic_arabtex") &&
 337                                         // are we in an inset?
 338                                         runparams.local_font != 0 &&
 339                                         // is the inset within an \L or \R?
 340                                         //
 341                                         // FIXME: currently, we don't check this; this means that
 342                                         // we'll have unnnecessary \L and \R commands, but that
 343                                         // doesn't seem to hurt (though latex will complain)
 344                                         //
 345                                         // is this paragraph in the opposite direction?
 346                                         runparams.local_font->isRightToLeft() !=
 347                                                 par_language->rightToLeft()
 348                                 ) {
 349                                 // FIXME: I don't have a working copy of the Arabi package, so
 350                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 351                                 // or not...
 352                                 if (par_language->lang() == "farsi")
 353                                         os << "\\textFR{";
 354                                 else if (outer_language->lang() == "farsi")
 355                                         os << "\\textLR{";
 356                                 else if (par_language->lang() == "arabic_arabi")
 357                                         os << "\\textAR{";
 358                                 else if (outer_language->lang() == "arabic_arabi")
 359                                         os << "\\textLR{";
 360                                 // remaining RTL languages currently is hebrew
 361                                 else if (par_language->rightToLeft())
 362                                         os << "\\R{";
 363                                 else
 364                                         os << "\\L{";
 365                         }
 366                         os << from_ascii(subst(
 367                                 lyxrc.language_command_begin,
 368                                 "$$lang",
 369                                 par_language->babel()))
 370                            // the '%' is necessary to prevent unwanted whitespace
 371                            << "%\n";
 372                         texrow.newline();
 373                 }
 374         }
 375
 376         // Switch file encoding if necessary; no need to do this for "default"
 377         // encoding, since this only affects the position of the outputted
 378         // \inputencoding command; the encoding switch will occur when necessary
 379         if (bparams.inputenc == "auto" &&
 380             runparams.encoding->package() == Encoding::inputenc) {
 381                 // Look ahead for future encoding changes.
 382                 // We try to output them at the beginning of the paragraph,
 383                 // since the \inputencoding command is not allowed e.g. in
 384                 // sections.
 385                 for (pos_type i = 0; i < pit->size(); ++i) {
 386                         char_type const c = pit->getChar(i);
 387                         if (c < 0x80)
 388                                 continue;
 389                         if (pit->isInset(i))
 390                                 break;
 391                         // All characters before c are in the ASCII range, and
 392                         // c is non-ASCII (but no inset), so change the
 393                         // encoding to that required by the language of c.
 394                         Encoding const * const encoding =
 395                                 pit->getFontSettings(bparams, i).language()->encoding();
 396                         pair<bool, int> enc_switch = switchEncoding(os, bparams, false,
 397                                         *(runparams.encoding), *encoding);
 398                         if (encoding->package() == Encoding::inputenc && enc_switch.first) {
 399                                 runparams.encoding = encoding;
 400                                 if (enc_switch.second > 0) {
 401                                         // the '%' is necessary to prevent unwanted whitespace
 402                                         os << "%\n";
 403                                         texrow.newline();
 404                                 }
 405                         }
 406                         break;
 407                 }
 408         }
 409
 410         // In an inset with unlimited length (all in one row),
 411         // don't allow any special options in the paragraph
 412         if (!pit->forceDefaultParagraphs()) {
 413                 if (pit->params().startOfAppendix()) {
 414                         os << "\\appendix\n";
 415                         texrow.newline();
 416                 }
 417
 418                 if (!pit->params().spacing().isDefault()
 419                         && (pit == paragraphs.begin()
 420                             || !boost::prior(pit)->hasSameLayout(*pit)))
 421                 {
 422                         os << from_ascii(pit->params().spacing().writeEnvirBegin())
 423                             << '\n';
 424                         texrow.newline();
 425                 }
 426
 427                 if (style->isCommand()) {
 428                         os << '\n';
 429                         texrow.newline();
 430                 }
 431         }
 432
 433         switch (style->latextype) {
 434         case LATEX_COMMAND:
 435                 os << '\\' << from_ascii(style->latexname());
 436
 437                 // Separate handling of optional argument inset.
 438                 if (style->optionalargs > 0) {
 439                         int ret = latexOptArgInsets(buf, *pit, os, runparams,
 440                                                     style->optionalargs);
 441                         while (ret > 0) {
 442                                 texrow.newline();
 443                                 --ret;
 444                         }
 445                 }
 446                 else
 447                         os << from_ascii(style->latexparam());
 448                 break;
 449         case LATEX_ITEM_ENVIRONMENT:
 450         case LATEX_LIST_ENVIRONMENT:
 451                 os << "\\item ";
 452                 break;
 453         case LATEX_BIB_ENVIRONMENT:
 454                 // ignore this, the inset will write itself
 455                 break;
 456         default:
 457                 break;
 458         }
 459
 460         Font const outerfont =
 461                 outerFont(std::distance(paragraphs.begin(), pit),
 462                           paragraphs);
 463
 464         // FIXME UNICODE
 465         os << from_utf8(everypar);
 466         bool need_par = pit->latex(buf, bparams, outerfont,
 467                                              os, texrow, runparams);
 468
 469         // Make sure that \\par is done with the font of the last
 470         // character if this has another size as the default.
 471         // This is necessary because LaTeX (and LyX on the screen)
 472         // calculates the space between the baselines according
 473         // to this font. (Matthias)
 474         //
 475         // Is this really needed ? (Dekel)
 476         // We do not need to use to change the font for the last paragraph
 477         // or for a command.
 478
 479         Font const font =
 480                 (pit->empty()
 481                  ? pit->getLayoutFont(bparams, outerfont)
 482                  : pit->getFont(bparams, pit->size() - 1, outerfont));
 483
 484         bool is_command = style->isCommand();
 485
 486         if (style->resfont.size() != font.fontInfo().size()
 487             && boost::next(pit) != paragraphs.end()
 488             && !is_command) {
 489                 if (!need_par)
 490                         os << '{';
 491                 os << "\\" << from_ascii(font.latexSize()) << " \\par}";
 492         } else if (need_par) {
 493                 os << "\\par}";
 494         } else if (is_command)
 495                 os << '}';
 496
 497         bool pending_newline = false;
 498         switch (style->latextype) {
 499         case LATEX_ITEM_ENVIRONMENT:
 500         case LATEX_LIST_ENVIRONMENT:
 501                 if (boost::next(pit) != paragraphs.end()
 502                     && (pit->params().depth() < boost::next(pit)->params().depth()))
 503                         pending_newline = true;
 504                 break;
 505         case LATEX_ENVIRONMENT: {
 506                 // if its the last paragraph of the current environment
 507                 // skip it otherwise fall through
 508                 ParagraphList::const_iterator next = boost::next(pit);
 509
 510                 if (next != paragraphs.end()
 511                     && (next->layout() != pit->layout()
 512                         || next->params().depth() != pit->params().depth()))
 513                         break;
 514         }
 515
 516                 // fall through possible
 517         default:
 518                 // we don't need it for the last paragraph!!!
 519                 if (boost::next(pit) != paragraphs.end())
 520                         pending_newline = true;
 521         }
 522
 523         if (!pit->forceDefaultParagraphs()) {
 524                 if (!pit->params().spacing().isDefault()
 525                         && (boost::next(pit) == paragraphs.end()
 526                             || !boost::next(pit)->hasSameLayout(*pit)))
 527                 {
 528                         if (pending_newline) {
 529                                 os << '\n';
 530                                 texrow.newline();
 531                         }
 532                         os << from_ascii(pit->params().spacing().writeEnvirEnd());
 533                         pending_newline = true;
 534                 }
 535         }
 536
 537         // Closing the language is needed for the last paragraph; it is also
 538         // needed if we're within an \L or \R that we may have opened above (not
 539         // necessarily in this paragraph) and are about to close.
 540         bool closing_rtl_ltr_environment =
 541                 // not for ArabTeX
 542                 (par_language->lang() != "arabic_arabtex" &&
 543                  outer_language->lang() != "arabic_arabtex") &&
 544                 // have we opened and \L or \R environment?
 545                 runparams.local_font != 0 &&
 546                 runparams.local_font->isRightToLeft() != par_language->rightToLeft() &&
 547                 // are we about to close the language?
 548                 ((boost::next(pit) != paragraphs.end() &&
 549                   par_language->babel() !=
 550                         (boost::next(pit)->getParLanguage(bparams))->babel()) ||
 551                  (boost::next(pit) == paragraphs.end() &&
 552                   par_language->babel() != outer_language->babel()));
 553
 554         if (closing_rtl_ltr_environment || (boost::next(pit) == paragraphs.end()
 555             && par_language->babel() != outer_language->babel())) {
 556                 // Since \selectlanguage write the language to the aux file,
 557                 // we need to reset the language at the end of footnote or
 558                 // float.
 559
 560                 if (pending_newline) {
 561                         os << '\n';
 562                         texrow.newline();
 563                 }
 564                 if (lyxrc.language_command_end.empty()) {
 565                         if (!prev_language->babel().empty()) {
 566                                 os << from_ascii(subst(
 567                                         lyxrc.language_command_begin,
 568                                         "$$lang",
 569                                         prev_language->babel()));
 570                                 pending_newline = true;
 571                         }
 572                 } else if (!par_language->babel().empty()) {
 573                         os << from_ascii(subst(
 574                                 lyxrc.language_command_end,
 575                                 "$$lang",
 576                                 par_language->babel()));
 577                         pending_newline = true;
 578                 }
 579         }
 580         if (closing_rtl_ltr_environment)
 581                 os << "}";
 582
 583         if (pending_newline) {
 584                 os << '\n';
 585                 texrow.newline();
 586         }
 587
 588         // If this is the last paragraph, and a local_font was set upon entering
 589         // the inset, the encoding should be set back to that local_font's
 590         // encoding. We don't use switchEncoding(), because no explicit encoding
 591         // switch command is needed, since latex will automatically revert to it
 592         // when this inset closes.
 593         // This switch is only necessary if we're using "auto" or "default"
 594         // encoding.
 595         if (boost::next(pit) == paragraphs.end() && runparams_in.local_font != 0) {
 596                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
 597                 if (bparams.inputenc == "auto" || bparams.inputenc == "default")
 598                         os << setEncoding(runparams_in.encoding->iconvName());
 599
 600         }
 601         // Otherwise, the current encoding should be set for the next paragraph.
 602         else
 603                 runparams_in.encoding = runparams.encoding;
 604
 605
 606         // we don't need it for the last paragraph!!!
 607         // Note from JMarc: we will re-add a \n explicitely in
 608         // TeXEnvironment, because it is needed in this case
 609         if (boost::next(pit) != paragraphs.end()) {
 610                 os << '\n';
 611                 texrow.newline();
 612         }
 613
 614         if (boost::next(pit) != paragraphs.end())
 615                 LYXERR(Debug::LATEX, "TeXOnePar...done " << &*boost::next(pit));
 616
 617         return ++pit;
 618 }
 619
 620 } // anon namespace
 621
 622
 623 // LaTeX all paragraphs
 624 void latexParagraphs(Buffer const & buf,
 625                      ParagraphList const & paragraphs,
 626                      odocstream & os,
 627                      TexRow & texrow,
 628                      OutputParams const & runparams,
 629                      string const & everypar)
 630 {
 631         bool was_title = false;
 632         bool already_title = false;
 633         TextClass const & tclass = buf.params().getTextClass();
 634         ParagraphList::const_iterator par = paragraphs.begin();
 635         ParagraphList::const_iterator endpar = paragraphs.end();
 636
 637         BOOST_ASSERT(runparams.par_begin <= runparams.par_end);
 638         // if only part of the paragraphs will be outputed
 639         if (runparams.par_begin !=  runparams.par_end) {
 640                 par = boost::next(paragraphs.begin(), runparams.par_begin);
 641                 endpar = boost::next(paragraphs.begin(), runparams.par_end);
 642                 // runparams will be passed to nested paragraphs, so
 643                 // we have to reset the range parameters.
 644                 const_cast<OutputParams&>(runparams).par_begin = 0;
 645                 const_cast<OutputParams&>(runparams).par_end = 0;
 646         }
 647
 648         // if only_body
 649         while (par != endpar) {
 650                 ParagraphList::const_iterator lastpar = par;
 651                 // well we have to check if we are in an inset with unlimited
 652                 // length (all in one row) if that is true then we don't allow
 653                 // any special options in the paragraph and also we don't allow
 654                 // any environment other than the default layout of the
 655                 // text class to be valid!
 656                 if (!par->forceDefaultParagraphs()) {
 657                         LayoutPtr const & layout = par->layout();
 658
 659                         if (layout->intitle) {
 660                                 if (already_title) {
 661                                         lyxerr << "Error in latexParagraphs: You"
 662                                                 " should not mix title layouts"
 663                                                 " with normal ones." << endl;
 664                                 } else if (!was_title) {
 665                                         was_title = true;
 666                                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
 667                                                 os << "\\begin{"
 668                                                     << from_ascii(tclass.titlename())
 669                                                     << "}\n";
 670                                                 texrow.newline();
 671                                         }
 672                                 }
 673                         } else if (was_title && !already_title) {
 674                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 675                                         os << "\\end{" << from_ascii(tclass.titlename())
 676                                             << "}\n";
 677                                 }
 678                                 else {
 679                                         os << "\\" << from_ascii(tclass.titlename())
 680                                             << "\n";
 681                                 }
 682                                 texrow.newline();
 683                                 already_title = true;
 684                                 was_title = false;
 685                         }
 686
 687                         if (layout->is_environment) {
 688                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 689                                                 runparams, everypar);
 690                         } else if (layout->isEnvironment() ||
 691                                    !par->params().leftIndent().zero()) {
 692                                 par = TeXEnvironment(buf, paragraphs, par, os,
 693                                                      texrow, runparams);
 694                         } else {
 695                                 par = TeXOnePar(buf, paragraphs, par, os, texrow,
 696                                                 runparams, everypar);
 697                         }
 698                 } else {
 699                         par = TeXOnePar(buf, paragraphs, par, os, texrow,
 700                                         runparams, everypar);
 701                 }
 702                 if (std::distance(lastpar, par) >= std::distance(lastpar, endpar))
 703                         break;
 704         }
 705         // It might be that we only have a title in this document
 706         if (was_title && !already_title) {
 707                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 708                         os << "\\end{" << from_ascii(tclass.titlename())
 709                             << "}\n";
 710                 }
 711                 else {
 712                         os << "\\" << from_ascii(tclass.titlename())
 713                             << "\n";
 714                                 }
 715                 texrow.newline();
 716         }
 717 }
 718
 719
 720 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
 721                    bool moving_arg, Encoding const & oldEnc,
 722                    Encoding const & newEnc)
 723 {
 724         if ((bparams.inputenc != "auto" && bparams.inputenc != "default")
 725                 || moving_arg)
 726                 return make_pair(false, 0);
 727
 728         // Do nothing if the encoding is unchanged.
 729         if (oldEnc.name() == newEnc.name())
 730                 return make_pair(false, 0);
 731
 732         // FIXME We ignore encoding switches from/to encodings that do
 733         // neither support the inputenc package nor the CJK package here.
 734         // This does of course only work in special cases (e.g. switch from
 735         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
 736         // but it is the best we can do
 737         if (oldEnc.package() == Encoding::none
 738                 || newEnc.package() == Encoding::none)
 739                 return make_pair(false, 0);
 740
 741         LYXERR(Debug::LATEX, "Changing LaTeX encoding from "
 742                 << oldEnc.name() << " to " << newEnc.name());
 743         os << setEncoding(newEnc.iconvName());
 744         if (bparams.inputenc == "default")
 745                 return make_pair(true, 0);
 746
 747         docstring const inputenc = from_ascii(newEnc.latexName());
 748         switch (newEnc.package()) {
 749                 case Encoding::none:
 750                         // shouldn't ever reach here, see above
 751                         return make_pair(true, 0);
 752                 case Encoding::inputenc: {
 753                         int count = inputenc.length();
 754                         if (oldEnc.package() == Encoding::CJK) {
 755                                 os << "\\end{CJK}";
 756                                 count += 9;
 757                         }
 758                         os << "\\inputencoding{" << inputenc << '}';
 759                         return make_pair(true, count + 16);
 760                 }
 761                 case Encoding::CJK: {
 762                         int count = inputenc.length();
 763                         if (oldEnc.package() == Encoding::CJK) {
 764                                 os << "\\end{CJK}";
 765                                 count += 9;
 766                         }
 767                         os << "\\begin{CJK}{" << inputenc << "}{}";
 768                         return make_pair(true, count + 15);
 769                 }
 770         }
 771         // Dead code to avoid a warning:
 772         return make_pair(true, 0);
 773 }
 774
 775 } // namespace lyx