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 "Encoding.h"
  18 #include "Font.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 "ParagraphParameters.h"
  26 #include "texstream.h"
  27 #include "TextClass.h"
  28
  29 #include "insets/InsetBibitem.h"
  30 #include "insets/InsetArgument.h"
  31
  32 #include "support/lassert.h"
  33 #include "support/convert.h"
  34 #include "support/debug.h"
  35 #include "support/lstrings.h"
  36 #include "support/lyxalgo.h"
  37 #include "support/textutils.h"
  38
  39 #include <QThreadStorage>
  40
  41 #include <list>
  42
  43 using namespace std;
  44 using namespace lyx::support;
  45
  46
  47 namespace lyx {
  48
  49 namespace {
  50
  51 enum OpenEncoding {
  52         none,
  53         inputenc,
  54         CJK
  55 };
  56
  57
  58 struct OutputState
  59 {
  60         OutputState() : open_encoding_(none), cjk_inherited_(0),
  61                         prev_env_language_(0), open_polyglossia_lang_("")
  62         {
  63         }
  64         OpenEncoding open_encoding_;
  65         int cjk_inherited_;
  66         Language const * prev_env_language_;
  67         string open_polyglossia_lang_;
  68 };
  69
  70
  71 OutputState * getOutputState()
  72 {
  73         // FIXME An instance of OutputState should be kept around for each export
  74         //       instead of using local thread storage
  75         static QThreadStorage<OutputState *> outputstate;
  76         if (!outputstate.hasLocalData())
  77                 outputstate.setLocalData(new OutputState);
  78         return outputstate.localData();
  79 }
  80
  81
  82 string const getPolyglossiaEnvName(Language const * lang)
  83 {
  84         string result = lang->polyglossia();
  85         if (result == "arabic")
  86                 // exceptional spelling; see polyglossia docs.
  87                 result = "Arabic";
  88         return result;
  89 }
  90
  91
  92 string const getPolyglossiaBegin(string const & lang_begin_command,
  93                                  string const & lang, string const & opts)
  94 {
  95         string result;
  96         if (!lang.empty())
  97                 result = subst(lang_begin_command, "$$lang", lang);
  98         string options = opts.empty() ?
  99                     string() : "[" + opts + "]";
 100         result = subst(result, "$$opts", options);
 101
 102         return result;
 103 }
 104
 105
 106 struct TeXEnvironmentData
 107 {
 108         bool cjk_nested;
 109         Layout const * style;
 110         Language const * par_language;
 111         Encoding const * prev_encoding;
 112         bool leftindent_open;
 113 };
 114
 115
 116 static TeXEnvironmentData prepareEnvironment(Buffer const & buf,
 117                                         Text const & text,
 118                                         ParagraphList::const_iterator pit,
 119                                         otexstream & os,
 120                                         OutputParams const & runparams)
 121 {
 122         TeXEnvironmentData data;
 123
 124         BufferParams const & bparams = buf.params();
 125
 126         // FIXME This test should not be necessary.
 127         // We should perhaps issue an error if it is.
 128         Layout const & style = text.inset().forcePlainLayout() ?
 129                 bparams.documentClass().plainLayout() : pit->layout();
 130
 131         ParagraphList const & paragraphs = text.paragraphs();
 132         ParagraphList::const_iterator const priorpit =
 133                 pit == paragraphs.begin() ? pit : prev(pit, 1);
 134
 135         OutputState * state = getOutputState();
 136         bool const use_prev_env_language = state->prev_env_language_ != 0
 137                         && priorpit->layout().isEnvironment()
 138                         && (priorpit->getDepth() > pit->getDepth()
 139                             || (priorpit->getDepth() == pit->getDepth()
 140                                 && priorpit->layout() != pit->layout()));
 141
 142         data.prev_encoding = runparams.encoding;
 143         data.par_language = pit->getParLanguage(bparams);
 144         Language const * const doc_language = bparams.language;
 145         Language const * const prev_par_language =
 146                 (pit != paragraphs.begin())
 147                 ? (use_prev_env_language ? state->prev_env_language_
 148                                          : priorpit->getParLanguage(bparams))
 149                 : doc_language;
 150
 151         bool const use_polyglossia = runparams.use_polyglossia;
 152         string const par_lang = use_polyglossia ?
 153                 getPolyglossiaEnvName(data.par_language) : data.par_language->babel();
 154         string const prev_par_lang = use_polyglossia ?
 155                 getPolyglossiaEnvName(prev_par_language) : prev_par_language->babel();
 156         string const doc_lang = use_polyglossia ?
 157                 getPolyglossiaEnvName(doc_language) : doc_language->babel();
 158         string const lang_begin_command = use_polyglossia ?
 159                 "\\begin{$$lang}" : lyxrc.language_command_begin;
 160         string const lang_end_command = use_polyglossia ?
 161                 "\\end{$$lang}" : lyxrc.language_command_end;
 162
 163         if (par_lang != prev_par_lang) {
 164                 if (!lang_end_command.empty() &&
 165                     prev_par_lang != doc_lang &&
 166                     !prev_par_lang.empty()) {
 167                         os << from_ascii(subst(
 168                                 lang_end_command,
 169                                 "$$lang",
 170                                 prev_par_lang))
 171                           // the '%' is necessary to prevent unwanted whitespace
 172                           << "%\n";
 173                 }
 174
 175                 if ((lang_end_command.empty() ||
 176                     par_lang != doc_lang) &&
 177                     !par_lang.empty()) {
 178                             string bc = use_polyglossia ?
 179                                         getPolyglossiaBegin(lang_begin_command, par_lang,
 180                                                             data.par_language->polyglossiaOpts())
 181                                       : subst(lang_begin_command, "$$lang", par_lang);
 182                             os << bc;
 183                             // the '%' is necessary to prevent unwanted whitespace
 184                             os << "%\n";
 185                 }
 186         }
 187
 188         data.leftindent_open = false;
 189         if (!pit->params().leftIndent().zero()) {
 190                 os << "\\begin{LyXParagraphLeftIndent}{"
 191                    << from_ascii(pit->params().leftIndent().asLatexString())
 192                    << "}\n";
 193                 data.leftindent_open = true;
 194         }
 195
 196         if (style.isEnvironment()) {
 197                 if (par_lang != doc_lang)
 198                         state->open_polyglossia_lang_ = par_lang;
 199                 os << "\\begin{" << from_ascii(style.latexname()) << '}';
 200                 if (!style.latexargs().empty()) {
 201                         OutputParams rp = runparams;
 202                         rp.local_font = &pit->getFirstFontSettings(bparams);
 203                         latexArgInsets(paragraphs, pit, os, rp, style.latexargs());
 204                 }
 205                 if (style.latextype == LATEX_LIST_ENVIRONMENT) {
 206                         os << '{'
 207                            << pit->params().labelWidthString()
 208                            << "}\n";
 209                 } else if (style.labeltype == LABEL_BIBLIO) {
 210                         if (pit->params().labelWidthString().empty())
 211                                 os << '{' << bibitemWidest(buf, runparams) << "}\n";
 212                         else
 213                                 os << '{'
 214                                   << pit->params().labelWidthString()
 215                                   << "}\n";
 216                 } else
 217                         os << from_ascii(style.latexparam()) << '\n';
 218         }
 219         data.style = &style;
 220
 221         // in multilingual environments, the CJK tags have to be nested properly
 222         data.cjk_nested = false;
 223         if (data.par_language->encoding()->package() == Encoding::CJK &&
 224             state->open_encoding_ != CJK && pit->isMultiLingual(bparams)) {
 225                 if (prev_par_language->encoding()->package() == Encoding::CJK)
 226                         os << "\\begin{CJK}{" << from_ascii(data.par_language->encoding()->latexName())
 227                            << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 228                 state->open_encoding_ = CJK;
 229                 data.cjk_nested = true;
 230         }
 231         return data;
 232 }
 233
 234
 235 static void finishEnvironment(otexstream & os, OutputParams const & runparams,
 236                               TeXEnvironmentData const & data)
 237 {
 238         OutputState * state = getOutputState();
 239         // BufferParams const & bparams = buf.params(); // FIXME: for speedup shortcut below, would require passing of "buf" as argument
 240         if (state->open_encoding_ == CJK && data.cjk_nested) {
 241                 // We need to close the encoding even if it does not change
 242                 // to do correct environment nesting
 243                 os << "\\end{CJK}\n";
 244                 state->open_encoding_ = none;
 245         }
 246
 247         if (data.style->isEnvironment()) {
 248                 os << breakln
 249                    << "\\end{" << from_ascii(data.style->latexname()) << "}\n";
 250                 state->prev_env_language_ = data.par_language;
 251                 if (runparams.encoding != data.prev_encoding) {
 252                         runparams.encoding = data.prev_encoding;
 253                         os << setEncoding(data.prev_encoding->iconvName());
 254                 }
 255         }
 256
 257         if (data.leftindent_open) {
 258                 os << breakln << "\\end{LyXParagraphLeftIndent}\n";
 259                 state->prev_env_language_ = data.par_language;
 260                 if (runparams.encoding != data.prev_encoding) {
 261                         runparams.encoding = data.prev_encoding;
 262                         os << setEncoding(data.prev_encoding->iconvName());
 263                 }
 264         }
 265
 266         // Check whether we should output a blank line after the environment
 267         if (!data.style->nextnoindent)
 268                 os << '\n';
 269 }
 270
 271
 272 void TeXEnvironment(Buffer const & buf, Text const & text,
 273                     OutputParams const & runparams,
 274                     pit_type & pit, otexstream & os)
 275 {
 276         ParagraphList const & paragraphs = text.paragraphs();
 277         ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 278         LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << pit);
 279
 280         Layout const & current_layout = par->layout();
 281         depth_type const current_depth = par->params().depth();
 282         Length const & current_left_indent = par->params().leftIndent();
 283
 284         // This is for debugging purpose at the end.
 285         pit_type const par_begin = pit;
 286         for (; pit < runparams.par_end; ++pit) {
 287                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 288
 289                 // check first if this is an higher depth paragraph.
 290                 bool go_out = (par->params().depth() < current_depth);
 291                 if (par->params().depth() == current_depth) {
 292                         // This environment is finished.
 293                         go_out |= (par->layout() != current_layout);
 294                         go_out |= (par->params().leftIndent() != current_left_indent);
 295                 }
 296                 if (go_out) {
 297                         // nothing to do here, restore pit and go out.
 298                         pit--;
 299                         break;
 300                 }
 301
 302                 if (par->layout() == current_layout
 303                         && par->params().depth() == current_depth
 304                         && par->params().leftIndent() == current_left_indent) {
 305                         // We are still in the same environment so TeXOnePar and continue;
 306                         TeXOnePar(buf, text, pit, os, runparams);
 307                         continue;
 308                 }
 309
 310                 // We are now in a deeper environment.
 311                 // Either par->layout() != current_layout
 312                 // Or     par->params().depth() > current_depth
 313                 // Or     par->params().leftIndent() != current_left_indent)
 314
 315                 // FIXME This test should not be necessary.
 316                 // We should perhaps issue an error if it is.
 317                 bool const force_plain_layout = text.inset().forcePlainLayout();
 318                 Layout const & style = force_plain_layout
 319                         ? buf.params().documentClass().plainLayout()
 320                         : par->layout();
 321
 322                 if (!style.isEnvironment()) {
 323                         // This is a standard paragraph, no need to call TeXEnvironment.
 324                         TeXOnePar(buf, text, pit, os, runparams);
 325                         continue;
 326                 }
 327
 328                 // This is a new environment.
 329                 TeXEnvironmentData const data =
 330                         prepareEnvironment(buf, text, par, os, runparams);
 331                 // Recursive call to TeXEnvironment!
 332                 TeXEnvironment(buf, text, runparams, pit, os);
 333                 finishEnvironment(os, runparams, data);
 334         }
 335
 336         if (pit != runparams.par_end)
 337                 LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << par_begin << " done.");
 338 }
 339
 340
 341 void getArgInsets(otexstream & os, OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs,
 342                   map<int, lyx::InsetArgument const *> ilist, vector<string> required, string const & prefix)
 343 {
 344         unsigned int const argnr = latexargs.size();
 345         if (argnr == 0)
 346                 return;
 347
 348         // Default and preset args are always output, so if they require
 349         // other arguments, consider this.
 350         Layout::LaTeXArgMap::const_iterator lit = latexargs.begin();
 351         Layout::LaTeXArgMap::const_iterator const lend = latexargs.end();
 352         for (; lit != lend; ++lit) {
 353                 Layout::latexarg arg = (*lit).second;
 354                 if ((!arg.presetarg.empty() || !arg.defaultarg.empty()) && !arg.requires.empty()) {
 355                                 vector<string> req = getVectorFromString(arg.requires);
 356                                 required.insert(required.end(), req.begin(), req.end());
 357                         }
 358         }
 359
 360         for (unsigned int i = 1; i <= argnr; ++i) {
 361                 map<int, InsetArgument const *>::const_iterator lit = ilist.find(i);
 362                 bool inserted = false;
 363                 if (lit != ilist.end()) {
 364                         InsetArgument const * ins = (*lit).second;
 365                         if (ins) {
 366                                 Layout::LaTeXArgMap::const_iterator const lait =
 367                                                 latexargs.find(ins->name());
 368                                 if (lait != latexargs.end()) {
 369                                         Layout::latexarg arg = (*lait).second;
 370                                         docstring ldelim = arg.mandatory ?
 371                                                         from_ascii("{") : from_ascii("[");
 372                                         docstring rdelim = arg.mandatory ?
 373                                                         from_ascii("}") : from_ascii("]");
 374                                         if (!arg.ldelim.empty())
 375                                                 ldelim = arg.ldelim;
 376                                         if (!arg.rdelim.empty())
 377                                                 rdelim = arg.rdelim;
 378                                         ins->latexArgument(os, runparams, ldelim, rdelim, arg.presetarg);
 379                                         inserted = true;
 380                                 }
 381                         }
 382                 }
 383                 if (!inserted) {
 384                         Layout::LaTeXArgMap::const_iterator lait = latexargs.begin();
 385                         Layout::LaTeXArgMap::const_iterator const laend = latexargs.end();
 386                         for (; lait != laend; ++lait) {
 387                                 string const name = prefix + convert<string>(i);
 388                                 if ((*lait).first == name) {
 389                                         Layout::latexarg arg = (*lait).second;
 390                                         docstring preset = arg.presetarg;
 391                                         if (!arg.defaultarg.empty()) {
 392                                                 if (!preset.empty())
 393                                                         preset += ",";
 394                                                 preset += arg.defaultarg;
 395                                         }
 396                                         if (arg.mandatory) {
 397                                                 docstring ldelim = arg.ldelim.empty() ?
 398                                                                 from_ascii("{") : arg.ldelim;
 399                                                 docstring rdelim = arg.rdelim.empty() ?
 400                                                                 from_ascii("}") : arg.rdelim;
 401                                                 os << ldelim << preset << rdelim;
 402                                         } else if (!preset.empty()) {
 403                                                 docstring ldelim = arg.ldelim.empty() ?
 404                                                                 from_ascii("[") : arg.ldelim;
 405                                                 docstring rdelim = arg.rdelim.empty() ?
 406                                                                 from_ascii("]") : arg.rdelim;
 407                                                 os << ldelim << preset << rdelim;
 408                                         } else if (find(required.begin(), required.end(),
 409                                                    (*lait).first) != required.end()) {
 410                                                 docstring ldelim = arg.ldelim.empty() ?
 411                                                                 from_ascii("[") : arg.ldelim;
 412                                                 docstring rdelim = arg.rdelim.empty() ?
 413                                                                 from_ascii("]") : arg.rdelim;
 414                                                 os << ldelim << rdelim;
 415                                         } else
 416                                                 break;
 417                                 }
 418                         }
 419                 }
 420         }
 421 }
 422
 423
 424 } // namespace anon
 425
 426
 427 void latexArgInsets(Paragraph const & par, otexstream & os,
 428         OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs, string const & prefix)
 429 {
 430         map<int, InsetArgument const *> ilist;
 431         vector<string> required;
 432
 433         InsetList::const_iterator it = par.insetList().begin();
 434         InsetList::const_iterator end = par.insetList().end();
 435         for (; it != end; ++it) {
 436                 if (it->inset->lyxCode() == ARG_CODE) {
 437                         InsetArgument const * ins =
 438                                 static_cast<InsetArgument const *>(it->inset);
 439                         if (ins->name().empty())
 440                                 LYXERR0("Error: Unnamed argument inset!");
 441                         else {
 442                                 string const name = prefix.empty() ? ins->name() : split(ins->name(), ':');
 443                                 unsigned int const nr = convert<unsigned int>(name);
 444                                 ilist[nr] = ins;
 445                                 Layout::LaTeXArgMap::const_iterator const lit =
 446                                                 latexargs.find(ins->name());
 447                                 if (lit != latexargs.end()) {
 448                                         Layout::latexarg const & arg = (*lit).second;
 449                                         if (!arg.requires.empty()) {
 450                                                 vector<string> req = getVectorFromString(arg.requires);
 451                                                 required.insert(required.end(), req.begin(), req.end());
 452                                         }
 453                                 }
 454                         }
 455                 }
 456         }
 457         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 458 }
 459
 460
 461 void latexArgInsets(ParagraphList const & pars, ParagraphList::const_iterator pit,
 462         otexstream & os, OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs,
 463         string const & prefix)
 464 {
 465         map<int, InsetArgument const *> ilist;
 466         vector<string> required;
 467
 468         depth_type const current_depth = pit->params().depth();
 469         Layout const current_layout = pit->layout();
 470
 471         // get the first paragraph in sequence with this layout and depth
 472         pit_type offset = 0;
 473         while (true) {
 474                 if (lyx::prev(pit, offset) == pars.begin())
 475                         break;
 476                 ParagraphList::const_iterator priorpit = lyx::prev(pit, offset + 1);
 477                 if (priorpit->layout() == current_layout
 478                     && priorpit->params().depth() == current_depth)
 479                         ++offset;
 480                 else
 481                         break;
 482         }
 483
 484         ParagraphList::const_iterator spit = lyx::prev(pit, offset);
 485
 486         for (; spit != pars.end(); ++spit) {
 487                 if (spit->layout() != current_layout || spit->params().depth() < current_depth)
 488                         break;
 489                 if (spit->params().depth() > current_depth)
 490                         continue;
 491                 InsetList::const_iterator it = spit->insetList().begin();
 492                 InsetList::const_iterator end = spit->insetList().end();
 493                 for (; it != end; ++it) {
 494                         if (it->inset->lyxCode() == ARG_CODE) {
 495                                 InsetArgument const * ins =
 496                                         static_cast<InsetArgument const *>(it->inset);
 497                                 if (ins->name().empty())
 498                                         LYXERR0("Error: Unnamed argument inset!");
 499                                 else {
 500                                         string const name = prefix.empty() ? ins->name() : split(ins->name(), ':');
 501                                         unsigned int const nr = convert<unsigned int>(name);
 502                                         if (ilist.find(nr) == ilist.end())
 503                                                 ilist[nr] = ins;
 504                                         Layout::LaTeXArgMap::const_iterator const lit =
 505                                                         latexargs.find(ins->name());
 506                                         if (lit != latexargs.end()) {
 507                                                 Layout::latexarg const & arg = (*lit).second;
 508                                                 if (!arg.requires.empty()) {
 509                                                         vector<string> req = getVectorFromString(arg.requires);
 510                                                         required.insert(required.end(), req.begin(), req.end());
 511                                                 }
 512                                         }
 513                                 }
 514                         }
 515                 }
 516         }
 517         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 518 }
 519
 520 namespace {
 521
 522 // output the proper paragraph start according to latextype.
 523 void parStartCommand(Paragraph const & par, otexstream & os,
 524                      OutputParams const & runparams, Layout const & style)
 525 {
 526         switch (style.latextype) {
 527         case LATEX_COMMAND:
 528                 os << '\\' << from_ascii(style.latexname());
 529
 530                 // Command arguments
 531                 if (!style.latexargs().empty())
 532                         latexArgInsets(par, os, runparams, style.latexargs());
 533                 os << from_ascii(style.latexparam());
 534                 break;
 535         case LATEX_ITEM_ENVIRONMENT:
 536         case LATEX_LIST_ENVIRONMENT:
 537                 os << "\\" + style.itemcommand();
 538                 // Item arguments
 539                 if (!style.itemargs().empty())
 540                         latexArgInsets(par, os, runparams, style.itemargs(), "item:");
 541                 os << " ";
 542                 break;
 543         case LATEX_BIB_ENVIRONMENT:
 544                 // ignore this, the inset will write itself
 545                 break;
 546         default:
 547                 break;
 548         }
 549 }
 550
 551 } // namespace anon
 552
 553 // FIXME: this should be anonymous
 554 void TeXOnePar(Buffer const & buf,
 555                Text const & text,
 556                pit_type pit,
 557                otexstream & os,
 558                OutputParams const & runparams_in,
 559                string const & everypar,
 560                int start_pos, int end_pos)
 561 {
 562         BufferParams const & bparams = runparams_in.is_child
 563                 ? buf.masterParams() : buf.params();
 564         ParagraphList const & paragraphs = text.paragraphs();
 565         Paragraph const & par = paragraphs.at(pit);
 566         // FIXME This check should not really be needed.
 567         // Perhaps we should issue an error if it is.
 568         Layout const & style = text.inset().forcePlainLayout() ?
 569                 bparams.documentClass().plainLayout() : par.layout();
 570
 571         if (style.inpreamble)
 572                 return;
 573
 574         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " ptr " << &par << " '"
 575                 << everypar << "'");
 576
 577         OutputParams runparams = runparams_in;
 578         runparams.isLastPar = (pit == pit_type(paragraphs.size() - 1));
 579         // We reinitialze par begin and end to be on the safe side
 580         // with embedded inset as we don't know if they set those
 581         // value correctly.
 582         runparams.par_begin = 0;
 583         runparams.par_end = 0;
 584
 585         bool const maintext = text.isMainText();
 586         // we are at the beginning of an inset and CJK is already open;
 587         // we count inheritation levels to get the inset nesting right.
 588         OutputState * state = getOutputState();
 589         if (pit == 0 && !maintext
 590             && (state->cjk_inherited_ > 0 || state->open_encoding_ == CJK)) {
 591                 state->cjk_inherited_ += 1;
 592                 state->open_encoding_ = none;
 593         }
 594
 595         if (text.inset().isPassThru()) {
 596                 Font const outerfont = text.outerFont(pit);
 597
 598                 // No newline before first paragraph in this lyxtext
 599                 if (pit > 0) {
 600                         os << '\n';
 601                         if (!text.inset().getLayout().parbreakIsNewline())
 602                                 os << '\n';
 603                 }
 604
 605                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 606                 return;
 607         }
 608
 609         Paragraph const * nextpar = runparams.isLastPar
 610                 ? 0 : &paragraphs.at(pit + 1);
 611
 612         if (style.pass_thru) {
 613                 Font const outerfont = text.outerFont(pit);
 614                 parStartCommand(par, os, runparams, style);
 615
 616                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 617
 618                 // I did not create a parEndCommand for this minuscule
 619                 // task because in the other user of parStartCommand
 620                 // the code is different (JMarc)
 621                 if (style.isCommand())
 622                         os << "}\n";
 623                 else
 624                         os << '\n';
 625                 if (!style.parbreak_is_newline) {
 626                         os << '\n';
 627                 } else if (nextpar && !style.isEnvironment()) {
 628                         Layout const nextstyle = text.inset().forcePlainLayout()
 629                                 ? bparams.documentClass().plainLayout()
 630                                 : nextpar->layout();
 631                         if (nextstyle.name() != style.name())
 632                                 os << '\n';
 633                 }
 634
 635                 return;
 636         }
 637
 638         // This paragraph's language
 639         Language const * const par_language = par.getParLanguage(bparams);
 640         Language const * const nextpar_language = nextpar ?
 641                 nextpar->getParLanguage(bparams) : 0;
 642         // The document's language
 643         Language const * const doc_language = bparams.language;
 644         // The language that was in effect when the environment this paragraph is
 645         // inside of was opened
 646         Language const * const outer_language =
 647                 (runparams.local_font != 0) ?
 648                         runparams.local_font->language() : doc_language;
 649
 650         Paragraph const * priorpar = (pit == 0) ? 0 : &paragraphs.at(pit - 1);
 651
 652         // The previous language that was in effect is the language of the
 653         // previous paragraph, unless the previous paragraph is inside an
 654         // environment with nesting depth greater than (or equal to, but with
 655         // a different layout) the current one. If there is no previous
 656         // paragraph, the previous language is the outer language.
 657         bool const use_prev_env_language = state->prev_env_language_ != 0
 658                         && priorpar
 659                         && priorpar->layout().isEnvironment()
 660                         && (priorpar->getDepth() > par.getDepth()
 661                             || (priorpar->getDepth() == par.getDepth()
 662                                     && priorpar->layout() != par.layout()));
 663         Language const * const prev_language =
 664                 (pit != 0)
 665                 ? (use_prev_env_language ? state->prev_env_language_
 666                                          : priorpar->getParLanguage(bparams))
 667                 : outer_language;
 668
 669
 670         bool const use_polyglossia = runparams.use_polyglossia;
 671         string const par_lang = use_polyglossia ?
 672                 getPolyglossiaEnvName(par_language): par_language->babel();
 673         string const prev_lang = use_polyglossia ?
 674                 getPolyglossiaEnvName(prev_language) : prev_language->babel();
 675         string const outer_lang = use_polyglossia ?
 676                 getPolyglossiaEnvName(outer_language) : outer_language->babel();
 677         string const nextpar_lang = nextpar_language ? (use_polyglossia ?
 678                 getPolyglossiaEnvName(nextpar_language) :
 679                 nextpar_language->babel()) : string();
 680         string lang_begin_command = use_polyglossia ?
 681                 "\\begin{$$lang}$$opts" : lyxrc.language_command_begin;
 682         string lang_end_command = use_polyglossia ?
 683                 "\\end{$$lang}" : lyxrc.language_command_end;
 684         // the '%' is necessary to prevent unwanted whitespace
 685         string lang_command_termination = "%\n";
 686
 687         // In some insets (such as Arguments), we cannot use \selectlanguage
 688         bool const localswitch = text.inset().forceLocalFontSwitch();
 689         if (localswitch) {
 690                 lang_begin_command = use_polyglossia ?
 691                             "\\text$$lang$$opts{" : lyxrc.language_command_local;
 692                 lang_end_command = "}";
 693                 lang_command_termination.clear();
 694         }
 695
 696         if (par_lang != prev_lang
 697                 // check if we already put language command in TeXEnvironment()
 698                 && !(style.isEnvironment()
 699                      && (pit == 0 || (priorpar->layout() != par.layout()
 700                                           && priorpar->getDepth() <= par.getDepth())
 701                                   || priorpar->getDepth() < par.getDepth())))
 702         {
 703                 if (!lang_end_command.empty() &&
 704                     prev_lang != outer_lang &&
 705                     !prev_lang.empty())
 706                 {
 707                         os << from_ascii(subst(lang_end_command,
 708                                 "$$lang",
 709                                 prev_lang))
 710                            << lang_command_termination;
 711                         if (prev_lang == state->open_polyglossia_lang_)
 712                                 state->open_polyglossia_lang_ = "";
 713                 }
 714
 715                 // We need to open a new language if we couldn't close the previous
 716                 // one (because there's no language_command_end); and even if we closed
 717                 // the previous one, if the current language is different than the
 718                 // outer_language (which is currently in effect once the previous one
 719                 // is closed).
 720                 if ((lang_end_command.empty() || par_lang != outer_lang)
 721                         && !par_lang.empty()) {
 722                         // If we're inside an inset, and that inset is within an \L or \R
 723                         // (or equivalents), then within the inset, too, any opposite
 724                         // language paragraph should appear within an \L or \R (in addition
 725                         // to, outside of, the normal language switch commands).
 726                         // This behavior is not correct for ArabTeX, though.
 727                         if (!use_polyglossia
 728                             // not for ArabTeX
 729                                 && par_language->lang() != "arabic_arabtex"
 730                                 && outer_language->lang() != "arabic_arabtex"
 731                             // are we in an inset?
 732                             && runparams.local_font != 0
 733                             // is the inset within an \L or \R?
 734                             //
 735                             // FIXME: currently, we don't check this; this means that
 736                             // we'll have unnnecessary \L and \R commands, but that
 737                             // doesn't seem to hurt (though latex will complain)
 738                             //
 739                             // is this paragraph in the opposite direction?
 740                             && runparams.local_font->isRightToLeft() != par_language->rightToLeft()) {
 741                                 // FIXME: I don't have a working copy of the Arabi package, so
 742                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 743                                 // or not...
 744                                 if (par_language->lang() == "farsi")
 745                                         os << "\\textFR{";
 746                                 else if (outer_language->lang() == "farsi")
 747                                         os << "\\textLR{";
 748                                 else if (par_language->lang() == "arabic_arabi")
 749                                         os << "\\textAR{";
 750                                 else if (outer_language->lang() == "arabic_arabi")
 751                                         os << "\\textLR{";
 752                                 // remaining RTL languages currently is hebrew
 753                                 else if (par_language->rightToLeft())
 754                                         os << "\\R{";
 755                                 else
 756                                         os << "\\L{";
 757                         }
 758                         // With CJK, the CJK tag has to be closed first (see below)
 759                         if (runparams.encoding->package() != Encoding::CJK
 760                             && !par_lang.empty()) {
 761                                 string bc = use_polyglossia ?
 762                                           getPolyglossiaBegin(lang_begin_command, par_lang, par_language->polyglossiaOpts())
 763                                           : subst(lang_begin_command, "$$lang", par_lang);
 764                                 os << bc;
 765                                 os << lang_command_termination;
 766                         }
 767                 }
 768         }
 769
 770         // Switch file encoding if necessary; no need to do this for "default"
 771         // encoding, since this only affects the position of the outputted
 772         // \inputencoding command; the encoding switch will occur when necessary
 773         if (bparams.inputenc == "auto"
 774                 && !runparams.isFullUnicode() // Xe/LuaTeX use one document-wide encoding  (see also switchEncoding())
 775                 && runparams.encoding->package() != Encoding::none) {
 776                 // Look ahead for future encoding changes.
 777                 // We try to output them at the beginning of the paragraph,
 778                 // since the \inputencoding command is not allowed e.g. in
 779                 // sections. For this reason we only set runparams.moving_arg
 780                 // after checking for the encoding change, otherwise the
 781                 // change would be always avoided by switchEncoding().
 782                 for (pos_type i = 0; i < par.size(); ++i) {
 783                         char_type const c = par.getChar(i);
 784                         Encoding const * const encoding =
 785                                 par.getFontSettings(bparams, i).language()->encoding();
 786                         if (encoding->package() != Encoding::CJK
 787                                 && runparams.encoding->package() == Encoding::inputenc
 788                                 && isASCII(c))
 789                                 continue;
 790                         if (par.isInset(i))
 791                                 break;
 792                         // All characters before c are in the ASCII range, and
 793                         // c is non-ASCII (but no inset), so change the
 794                         // encoding to that required by the language of c.
 795                         // With CJK, only add switch if we have CJK content at the beginning
 796                         // of the paragraph
 797                         if (i != 0 && encoding->package() == Encoding::CJK)
 798                                 continue;
 799
 800                         pair<bool, int> enc_switch = switchEncoding(os.os(),
 801                                                 bparams, runparams, *encoding);
 802                         // the following is necessary after a CJK environment in a multilingual
 803                         // context (nesting issue).
 804                         if (par_language->encoding()->package() == Encoding::CJK
 805                                 && state->open_encoding_ != CJK && state->cjk_inherited_ == 0) {
 806                                 os << "\\begin{CJK}{" << from_ascii(par_language->encoding()->latexName())
 807                                    << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 808                                 state->open_encoding_ = CJK;
 809                         }
 810                         if (encoding->package() != Encoding::none && enc_switch.first) {
 811                                 if (enc_switch.second > 0) {
 812                                         // the '%' is necessary to prevent unwanted whitespace
 813                                         os << "%\n";
 814                                 }
 815                                 // With CJK, the CJK tag had to be closed first (see above)
 816                                 if (runparams.encoding->package() == Encoding::CJK
 817                                     && !par_lang.empty()) {
 818                                         os << from_ascii(subst(
 819                                                 lang_begin_command,
 820                                                 "$$lang",
 821                                                 par_lang))
 822                                         << lang_command_termination;
 823                                 }
 824                                 runparams.encoding = encoding;
 825                         }
 826                         break;
 827                 }
 828         }
 829
 830         runparams.moving_arg |= style.needprotect;
 831         Encoding const * const prev_encoding = runparams.encoding;
 832
 833         bool const useSetSpace = bparams.documentClass().provides("SetSpace");
 834         if (par.allowParagraphCustomization()) {
 835                 if (par.params().startOfAppendix()) {
 836                         os << "\n\\appendix\n";
 837                 }
 838
 839                 if (!par.params().spacing().isDefault()
 840                         && (pit == 0 || !priorpar->hasSameLayout(par)))
 841                 {
 842                         os << from_ascii(par.params().spacing().writeEnvirBegin(useSetSpace))
 843                             << '\n';
 844                 }
 845
 846                 if (style.isCommand()) {
 847                         os << '\n';
 848                 }
 849         }
 850
 851         parStartCommand(par, os, runparams, style);
 852         Font const outerfont = text.outerFont(pit);
 853
 854         // FIXME UNICODE
 855         os << from_utf8(everypar);
 856         par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 857
 858         // Make sure that \\par is done with the font of the last
 859         // character if this has another size as the default.
 860         // This is necessary because LaTeX (and LyX on the screen)
 861         // calculates the space between the baselines according
 862         // to this font. (Matthias)
 863         //
 864         // We must not change the font for the last paragraph
 865         // of non-multipar insets, tabular cells or commands,
 866         // since this produces unwanted whitespace.
 867
 868         Font const font = par.empty()
 869                  ? par.getLayoutFont(bparams, outerfont)
 870                  : par.getFont(bparams, par.size() - 1, outerfont);
 871
 872         bool const is_command = style.isCommand();
 873
 874         if (style.resfont.size() != font.fontInfo().size()
 875             && (nextpar || maintext
 876                 || (text.inset().paragraphs().size() > 1
 877                     && text.inset().lyxCode() != CELL_CODE))
 878             && !is_command) {
 879                 os << '{';
 880                 os << "\\" << from_ascii(font.latexSize()) << " \\par}";
 881         } else if (is_command) {
 882                 os << '}';
 883                 if (!style.postcommandargs().empty())
 884                         latexArgInsets(par, os, runparams, style.postcommandargs(), "post:");
 885                 if (runparams.encoding != prev_encoding) {
 886                         runparams.encoding = prev_encoding;
 887                         os << setEncoding(prev_encoding->iconvName());
 888                 }
 889         }
 890
 891         bool pending_newline = false;
 892         bool unskip_newline = false;
 893         switch (style.latextype) {
 894         case LATEX_ITEM_ENVIRONMENT:
 895         case LATEX_LIST_ENVIRONMENT:
 896                 if (nextpar && par.params().depth() < nextpar->params().depth())
 897                         pending_newline = true;
 898                 break;
 899         case LATEX_ENVIRONMENT: {
 900                 // if its the last paragraph of the current environment
 901                 // skip it otherwise fall through
 902                 if (nextpar
 903                         && (nextpar->layout() != par.layout()
 904                         || nextpar->params().depth() != par.params().depth()))
 905                         break;
 906         }
 907
 908         // fall through possible
 909         default:
 910                 // we don't need it for the last paragraph!!!
 911                 if (nextpar)
 912                         pending_newline = true;
 913         }
 914
 915         if (par.allowParagraphCustomization()) {
 916                 if (!par.params().spacing().isDefault()
 917                         && (runparams.isLastPar || !nextpar->hasSameLayout(par))) {
 918                         if (pending_newline)
 919                                 os << '\n';
 920
 921                         string const endtag =
 922                                 par.params().spacing().writeEnvirEnd(useSetSpace);
 923                         if (prefixIs(endtag, "\\end{"))
 924                                 os << breakln;
 925
 926                         os << from_ascii(endtag);
 927                         pending_newline = true;
 928                 }
 929         }
 930
 931         // Closing the language is needed for the last paragraph; it is also
 932         // needed if we're within an \L or \R that we may have opened above (not
 933         // necessarily in this paragraph) and are about to close.
 934         bool closing_rtl_ltr_environment = !use_polyglossia
 935                 // not for ArabTeX
 936                 && (par_language->lang() != "arabic_arabtex"
 937                     && outer_language->lang() != "arabic_arabtex")
 938                 // have we opened an \L or \R environment?
 939                 && runparams.local_font != 0
 940                 && runparams.local_font->isRightToLeft() != par_language->rightToLeft()
 941                 // are we about to close the language?
 942                 &&((nextpar && par_lang != nextpar_lang)
 943                    || (runparams.isLastPar && par_lang != outer_lang));
 944
 945         if (closing_rtl_ltr_environment
 946             || (runparams.isLastPar
 947                 && par_lang != outer_lang)) {
 948                 // Since \selectlanguage write the language to the aux file,
 949                 // we need to reset the language at the end of footnote or
 950                 // float.
 951
 952                 if (pending_newline)
 953                         os << '\n';
 954
 955                 // when the paragraph uses CJK, the language has to be closed earlier
 956                 if (font.language()->encoding()->package() != Encoding::CJK) {
 957                         if (lang_end_command.empty()) {
 958                                 // If this is a child, we should restore the
 959                                 // master language after the last paragraph.
 960                                 Language const * const current_language =
 961                                         (runparams.isLastPar && runparams.master_language)
 962                                                 ? runparams.master_language
 963                                                 : outer_language;
 964                                 string const current_lang = use_polyglossia
 965                                         ? getPolyglossiaEnvName(current_language)
 966                                         : current_language->babel();
 967                                 if (!current_lang.empty()) {
 968                                         string bc = use_polyglossia ?
 969                                                     getPolyglossiaBegin(lang_begin_command, current_lang,
 970                                                                         current_language->polyglossiaOpts())
 971                                                   : subst(lang_begin_command, "$$lang", current_lang);
 972                                         os << bc;
 973                                         pending_newline = !localswitch;
 974                                         unskip_newline = !localswitch;
 975                                 }
 976                         } else if (!par_lang.empty()) {
 977                                 // If we are in an environment, we have to close the "outer" language afterwards
 978                                 if (!style.isEnvironment() || state->open_polyglossia_lang_ != par_lang) {
 979                                         os << from_ascii(subst(
 980                                                 lang_end_command,
 981                                                 "$$lang",
 982                                                 par_lang));
 983                                         pending_newline = !localswitch;
 984                                         unskip_newline = !localswitch;
 985                                 }
 986                         }
 987                 }
 988         }
 989         if (closing_rtl_ltr_environment)
 990                 os << "}";
 991
 992         bool const last_was_separator =
 993                 par.size() > 0 && par.isEnvSeparator(par.size() - 1);
 994
 995         if (pending_newline) {
 996                 if (unskip_newline)
 997                         // prevent unwanted whitespace
 998                         os << '%';
 999                 if (!os.afterParbreak() && !last_was_separator)
1000                         os << '\n';
1001         }
1002
1003         // if this is a CJK-paragraph and the next isn't, close CJK
1004         // also if the next paragraph is a multilingual environment (because of nesting)
1005         if (nextpar
1006                 && state->open_encoding_ == CJK
1007                 && (nextpar_language->encoding()->package() != Encoding::CJK
1008                    || (nextpar->layout().isEnvironment() && nextpar->isMultiLingual(bparams)))
1009                 // inbetween environments, CJK has to be closed later (nesting!)
1010                 && (!style.isEnvironment() || !nextpar->layout().isEnvironment())) {
1011                 os << "\\end{CJK}\n";
1012                 state->open_encoding_ = none;
1013         }
1014
1015         // If this is the last paragraph, close the CJK environment
1016         // if necessary. If it's an environment, we'll have to \end that first.
1017         if (runparams.isLastPar && !style.isEnvironment()) {
1018                 switch (state->open_encoding_) {
1019                         case CJK: {
1020                                 // do nothing at the end of child documents
1021                                 if (maintext && buf.masterBuffer() != &buf)
1022                                         break;
1023                                 // end of main text
1024                                 if (maintext) {
1025                                         os << "\n\\end{CJK}\n";
1026                                 // end of an inset
1027                                 } else
1028                                         os << "\\end{CJK}";
1029                                 state->open_encoding_ = none;
1030                                 break;
1031                         }
1032                         case inputenc: {
1033                                 os << "\\egroup";
1034                                 state->open_encoding_ = none;
1035                                 break;
1036                         }
1037                         case none:
1038                         default:
1039                                 // do nothing
1040                                 break;
1041                 }
1042         }
1043
1044         // If this is the last paragraph, and a local_font was set upon entering
1045         // the inset, and we're using "auto" or "default" encoding, and not
1046         // compiling with XeTeX or LuaTeX, the encoding
1047         // should be set back to that local_font's encoding.
1048         if (runparams.isLastPar && runparams_in.local_font != 0
1049             && runparams_in.encoding != runparams_in.local_font->language()->encoding()
1050             && (bparams.inputenc == "auto" || bparams.inputenc == "default")
1051                 && !runparams.isFullUnicode()
1052            ) {
1053                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
1054                 os << setEncoding(runparams_in.encoding->iconvName());
1055         }
1056         // Otherwise, the current encoding should be set for the next paragraph.
1057         else
1058                 runparams_in.encoding = runparams.encoding;
1059
1060
1061         // we don't need a newline for the last paragraph!!!
1062         // Note from JMarc: we will re-add a \n explicitly in
1063         // TeXEnvironment, because it is needed in this case
1064         if (nextpar && !os.afterParbreak() && !last_was_separator) {
1065                 // Make sure to start a new line
1066                 os << breakln;
1067                 Layout const & next_layout = nextpar->layout();
1068                 // A newline '\n' is always output before a command,
1069                 // so avoid doubling it.
1070                 if (!next_layout.isCommand()) {
1071                         // Here we now try to avoid spurious empty lines by
1072                         // outputting a paragraph break only if: (case 1) the
1073                         // paragraph style allows parbreaks and no \begin, \end
1074                         // or \item tags are going to follow (i.e., if the next
1075                         // isn't the first or the current isn't the last
1076                         // paragraph of an environment or itemize) and the
1077                         // depth and alignment of the following paragraph is
1078                         // unchanged, or (case 2) the following is a
1079                         // non-environment paragraph whose depth is increased
1080                         // but whose alignment is unchanged, or (case 3) the
1081                         // paragraph is not an environment and the next one is a
1082                         // non-itemize-like env at lower depth, or (case 4) the
1083                         // paragraph is a command not followed by an environment
1084                         // and the alignment of the current and next paragraph
1085                         // is unchanged, or (case 5) the current alignment is
1086                         // changed and a standard paragraph follows.
1087                         DocumentClass const & tclass = bparams.documentClass();
1088                         if ((style == next_layout
1089                              && !style.parbreak_is_newline
1090                              && !text.inset().getLayout().parbreakIsNewline()
1091                              && style.latextype != LATEX_ITEM_ENVIRONMENT
1092                              && style.latextype != LATEX_LIST_ENVIRONMENT
1093                              && style.align == par.getAlign()
1094                              && nextpar->getDepth() == par.getDepth()
1095                              && nextpar->getAlign() == par.getAlign())
1096                             || (!next_layout.isEnvironment()
1097                                 && nextpar->getDepth() > par.getDepth()
1098                                 && nextpar->getAlign() == par.getAlign())
1099                             || (!style.isEnvironment()
1100                                 && next_layout.latextype == LATEX_ENVIRONMENT
1101                                 && nextpar->getDepth() < par.getDepth())
1102                             || (style.isCommand()
1103                                 && !next_layout.isEnvironment()
1104                                 && style.align == par.getAlign()
1105                                 && next_layout.align == nextpar->getAlign())
1106                             || (style.align != par.getAlign()
1107                                 && tclass.isDefaultLayout(next_layout))) {
1108                                 os << '\n';
1109                         }
1110                 }
1111         }
1112
1113         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " done; ptr "
1114                 << &par << " next " << nextpar);
1115
1116         return;
1117 }
1118
1119
1120 // LaTeX all paragraphs
1121 void latexParagraphs(Buffer const & buf,
1122                      Text const & text,
1123                      otexstream & os,
1124                      OutputParams const & runparams,
1125                      string const & everypar)
1126 {
1127         LASSERT(runparams.par_begin <= runparams.par_end,
1128                 { os << "% LaTeX Output Error\n"; return; } );
1129
1130         BufferParams const & bparams = buf.params();
1131
1132         bool const maintext = text.isMainText();
1133         bool const is_child = buf.masterBuffer() != &buf;
1134
1135         // Open a CJK environment at the beginning of the main buffer
1136         // if the document's language is a CJK language
1137         // (but not in child documents)
1138         OutputState * state = getOutputState();
1139         if (maintext && !is_child
1140             && bparams.encoding().package() == Encoding::CJK) {
1141                 os << "\\begin{CJK}{" << from_ascii(bparams.encoding().latexName())
1142                 << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
1143                 state->open_encoding_ = CJK;
1144         }
1145         // if "auto begin" is switched off, explicitly switch the
1146         // language on at start
1147         string const mainlang = runparams.use_polyglossia
1148                 ? getPolyglossiaEnvName(bparams.language)
1149                 : bparams.language->babel();
1150         string const lang_begin_command = runparams.use_polyglossia ?
1151                 "\\begin{$$lang}$$opts" : lyxrc.language_command_begin;
1152
1153         if (maintext && !lyxrc.language_auto_begin &&
1154             !mainlang.empty()) {
1155                 // FIXME UNICODE
1156                 string bc = runparams.use_polyglossia ?
1157                             getPolyglossiaBegin(lang_begin_command, mainlang,
1158                                                 bparams.language->polyglossiaOpts())
1159                           : subst(lang_begin_command, "$$lang", mainlang);
1160                 os << bc;
1161                 os << '\n';
1162         }
1163
1164         ParagraphList const & paragraphs = text.paragraphs();
1165
1166         if (runparams.par_begin == runparams.par_end) {
1167                 // The full doc will be exported but it is easier to just rely on
1168                 // runparams range parameters that will be passed TeXEnvironment.
1169                 runparams.par_begin = 0;
1170                 runparams.par_end = paragraphs.size();
1171         }
1172
1173         pit_type pit = runparams.par_begin;
1174         // lastpit is for the language check after the loop.
1175         pit_type lastpit = pit;
1176         // variables used in the loop:
1177         bool was_title = false;
1178         bool already_title = false;
1179         DocumentClass const & tclass = bparams.documentClass();
1180
1181         for (; pit < runparams.par_end; ++pit) {
1182                 lastpit = pit;
1183                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
1184
1185                 // FIXME This check should not be needed. We should
1186                 // perhaps issue an error if it is.
1187                 Layout const & layout = text.inset().forcePlainLayout() ?
1188                                 tclass.plainLayout() : par->layout();
1189
1190                 if (layout.intitle) {
1191                         if (already_title) {
1192                                 LYXERR0("Error in latexParagraphs: You"
1193                                         " should not mix title layouts"
1194                                         " with normal ones.");
1195                         } else if (!was_title) {
1196                                 was_title = true;
1197                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1198                                         os << "\\begin{"
1199                                                         << from_ascii(tclass.titlename())
1200                                                         << "}\n";
1201                                 }
1202                         }
1203                 } else if (was_title && !already_title) {
1204                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
1205                                 os << "\\end{" << from_ascii(tclass.titlename())
1206                                                 << "}\n";
1207                         }
1208                         else {
1209                                 os << "\\" << from_ascii(tclass.titlename())
1210                                                 << "\n";
1211                         }
1212                         already_title = true;
1213                         was_title = false;
1214                 }
1215
1216
1217                 if (!layout.isEnvironment() && par->params().leftIndent().zero()) {
1218                         // This is a standard top level paragraph, TeX it and continue.
1219                         TeXOnePar(buf, text, pit, os, runparams, everypar);
1220                         continue;
1221                 }
1222
1223                 TeXEnvironmentData const data =
1224                         prepareEnvironment(buf, text, par, os, runparams);
1225                 // pit can be changed in TeXEnvironment.
1226                 TeXEnvironment(buf, text, runparams, pit, os);
1227                 finishEnvironment(os, runparams, data);
1228         }
1229
1230         if (pit == runparams.par_end) {
1231                         // Make sure that the last paragraph is
1232                         // correctly terminated (because TeXOnePar does
1233                         // not add a \n in this case)
1234                         //os << '\n';
1235         }
1236
1237         // It might be that we only have a title in this document
1238         if (was_title && !already_title) {
1239                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1240                         os << "\\end{" << from_ascii(tclass.titlename())
1241                            << "}\n";
1242                 } else {
1243                         os << "\\" << from_ascii(tclass.titlename())
1244                            << "\n";
1245                 }
1246         }
1247
1248         // if "auto end" is switched off, explicitly close the language at the end
1249         // but only if the last par is in a babel or polyglossia language
1250         string const lang_end_command = runparams.use_polyglossia ?
1251                 "\\end{$$lang}" : lyxrc.language_command_end;
1252         if (maintext && !lyxrc.language_auto_end && !mainlang.empty() &&
1253                 paragraphs.at(lastpit).getParLanguage(bparams)->encoding()->package() != Encoding::CJK) {
1254                 os << from_utf8(subst(lang_end_command,
1255                                         "$$lang",
1256                                         mainlang))
1257                         << '\n';
1258                 if (state->open_polyglossia_lang_ == mainlang)
1259                         state->open_polyglossia_lang_ = "";
1260         }
1261
1262         // If the last paragraph is an environment, we'll have to close
1263         // CJK at the very end to do proper nesting.
1264         if (maintext && !is_child && state->open_encoding_ == CJK) {
1265                 os << "\\end{CJK}\n";
1266                 state->open_encoding_ = none;
1267         }
1268         // Likewise for polyglossia
1269         if (maintext && !is_child && state->open_polyglossia_lang_ != "") {
1270                 os << from_utf8(subst(lang_end_command,
1271                                         "$$lang",
1272                                         state->open_polyglossia_lang_))
1273                    << '\n';
1274                 state->open_polyglossia_lang_ = "";
1275         }
1276
1277         // reset inherited encoding
1278         if (state->cjk_inherited_ > 0) {
1279                 state->cjk_inherited_ -= 1;
1280                 if (state->cjk_inherited_ == 0)
1281                         state->open_encoding_ = CJK;
1282         }
1283 }
1284
1285
1286 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
1287                    OutputParams const & runparams, Encoding const & newEnc,
1288                    bool force)
1289 {
1290         // XeTeX/LuaTeX use only one encoding per document:
1291         // * with useNonTeXFonts: "utf8plain",
1292         // * with XeTeX and TeX fonts: "ascii" (inputenc fails),
1293         // * with LuaTeX and TeX fonts: only one encoding accepted by luainputenc.
1294         if (runparams.isFullUnicode())
1295                 return make_pair(false, 0);
1296
1297         Encoding const & oldEnc = *runparams.encoding;
1298         bool moving_arg = runparams.moving_arg;
1299         // If we switch from/to CJK, we need to switch anyway, despite custom inputenc
1300         bool const from_to_cjk =
1301                 (oldEnc.package() == Encoding::CJK && newEnc.package() != Encoding::CJK)
1302                 || (oldEnc.package() != Encoding::CJK && newEnc.package() == Encoding::CJK);
1303         if (!force && !from_to_cjk
1304             && ((bparams.inputenc != "auto" && bparams.inputenc != "default") || moving_arg))
1305                 return make_pair(false, 0);
1306
1307         // Do nothing if the encoding is unchanged.
1308         if (oldEnc.name() == newEnc.name())
1309                 return make_pair(false, 0);
1310
1311         // FIXME We ignore encoding switches from/to encodings that do
1312         // neither support the inputenc package nor the CJK package here.
1313         // This does of course only work in special cases (e.g. switch from
1314         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
1315         // but it is the best we can do
1316         if (oldEnc.package() == Encoding::none
1317                 || newEnc.package() == Encoding::none)
1318                 return make_pair(false, 0);
1319
1320         LYXERR(Debug::LATEX, "Changing LaTeX encoding from "
1321                 << oldEnc.name() << " to " << newEnc.name());
1322         os << setEncoding(newEnc.iconvName());
1323         if (bparams.inputenc == "default")
1324                 return make_pair(true, 0);
1325
1326         docstring const inputenc_arg(from_ascii(newEnc.latexName()));
1327         OutputState * state = getOutputState();
1328         switch (newEnc.package()) {
1329                 case Encoding::none:
1330                 case Encoding::japanese:
1331                         // shouldn't ever reach here, see above
1332                         return make_pair(true, 0);
1333                 case Encoding::inputenc: {
1334                         int count = inputenc_arg.length();
1335                         if (oldEnc.package() == Encoding::CJK &&
1336                             state->open_encoding_ == CJK) {
1337                                 os << "\\end{CJK}";
1338                                 state->open_encoding_ = none;
1339                                 count += 9;
1340                         }
1341                         else if (oldEnc.package() == Encoding::inputenc &&
1342                                  state->open_encoding_ == inputenc) {
1343                                 os << "\\egroup";
1344                                 state->open_encoding_ = none;
1345                                 count += 7;
1346                         }
1347                         if (runparams.local_font != 0
1348                             &&  oldEnc.package() == Encoding::CJK) {
1349                                 // within insets, \inputenc switches need
1350                                 // to be embraced within \bgroup...\egroup;
1351                                 // else CJK fails.
1352                                 os << "\\bgroup";
1353                                 count += 7;
1354                                 state->open_encoding_ = inputenc;
1355                         }
1356                         // with the japanese option, inputenc is omitted.
1357                         if (runparams.use_japanese)
1358                                 return make_pair(true, count);
1359                         os << "\\inputencoding{" << inputenc_arg << '}';
1360                         return make_pair(true, count + 16);
1361                 }
1362                 case Encoding::CJK: {
1363                         int count = inputenc_arg.length();
1364                         if (oldEnc.package() == Encoding::CJK &&
1365                             state->open_encoding_ == CJK) {
1366                                 os << "\\end{CJK}";
1367                                 count += 9;
1368                         }
1369                         if (oldEnc.package() == Encoding::inputenc &&
1370                             state->open_encoding_ == inputenc) {
1371                                 os << "\\egroup";
1372                                 count += 7;
1373                         }
1374                         os << "\\begin{CJK}{" << inputenc_arg << "}{"
1375                            << from_ascii(bparams.fonts_cjk) << "}";
1376                         state->open_encoding_ = CJK;
1377                         return make_pair(true, count + 15);
1378                 }
1379         }
1380         // Dead code to avoid a warning:
1381         return make_pair(true, 0);
1382
1383 }
1384
1385 } // namespace lyx