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