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 "BiblioInfo.h"
  16 #include "Buffer.h"
  17 #include "BufferParams.h"
  18 #include "Encoding.h"
  19 #include "Font.h"
  20 #include "InsetList.h"
  21 #include "Language.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 "frontends/alert.h"
  33
  34 #include "support/lassert.h"
  35 #include "support/convert.h"
  36 #include "support/debug.h"
  37 #include "support/lstrings.h"
  38 #include "support/textutils.h"
  39 #include "support/gettext.h"
  40
  41 #include <QThreadStorage>
  42
  43 #include <list>
  44 #include <stack>
  45
  46 using namespace std;
  47 using namespace lyx::support;
  48
  49
  50 namespace lyx {
  51
  52 namespace {
  53
  54 enum OpenEncoding {
  55         none,
  56         inputenc,
  57         CJK
  58 };
  59
  60
  61 struct OutputState
  62 {
  63         OutputState() : prev_env_language_(nullptr), open_encoding_(none),
  64                 cjk_inherited_(0), nest_level_(0)
  65         {
  66         }
  67         Language const * prev_env_language_;
  68         stack<int> lang_switch_depth_;          // Both are always empty when
  69         stack<string> open_polyglossia_lang_;   // not using polyglossia
  70         OpenEncoding open_encoding_;
  71         int cjk_inherited_;
  72         int nest_level_;
  73 };
  74
  75
  76 OutputState * getOutputState()
  77 {
  78         // FIXME An instance of OutputState should be kept around for each export
  79         //       instead of using local thread storage
  80         static QThreadStorage<OutputState *> outputstate;
  81         if (!outputstate.hasLocalData())
  82                 outputstate.setLocalData(new OutputState);
  83         return outputstate.localData();
  84 }
  85
  86
  87 string const & openLanguageName(OutputState const * state)
  88 {
  89         // Return a reference to the last active language opened with
  90         // polyglossia or when using begin/end commands. If none or when
  91         // using babel with only a begin command, return a reference to
  92         // an empty string.
  93
  94         static string const empty;
  95
  96         return state->open_polyglossia_lang_.empty()
  97                 ? empty
  98                 : state->open_polyglossia_lang_.top();
  99 }
 100
 101
 102 bool atSameLastLangSwitchDepth(OutputState const * state)
 103 {
 104         // Return true if the actual nest level is the same at which the
 105         // language was switched when using polyglossia or begin/end
 106         // commands. Instead, return always true when using babel with
 107         // only a begin command.
 108
 109         return state->lang_switch_depth_.empty()
 110                         ? true
 111                         : abs(state->lang_switch_depth_.top()) == state->nest_level_;
 112 }
 113
 114
 115 bool isLocalSwitch(OutputState const * state)
 116 {
 117         // Return true if the language was opened by a local command switch.
 118
 119         return !state->lang_switch_depth_.empty()
 120                 && state->lang_switch_depth_.top() < 0;
 121 }
 122
 123
 124 bool langOpenedAtThisLevel(OutputState const * state)
 125 {
 126         // Return true if the language was opened at the current nesting level.
 127
 128         return !state->lang_switch_depth_.empty()
 129                 && abs(state->lang_switch_depth_.top()) == state->nest_level_;
 130 }
 131
 132
 133 string const getPolyglossiaEnvName(Language const * lang)
 134 {
 135         string result = lang->polyglossia();
 136         if (result == "arabic")
 137                 // exceptional spelling; see polyglossia docs.
 138                 result = "Arabic";
 139         return result;
 140 }
 141
 142
 143 string const getPolyglossiaBegin(string const & lang_begin_command,
 144                                  string const & lang, string const & opts,
 145                                  bool const localswitch = false)
 146 {
 147         string result;
 148         if (!lang.empty()) {
 149                 // we need to revert the upcasing done in getPolyglossiaEnvName()
 150                 // in case we have a local polyglossia command (\textarabic).
 151                 string language = localswitch ? ascii_lowercase(lang) : lang;
 152                 result = subst(lang_begin_command, "$$lang", language);
 153         }
 154         string options = opts.empty() ?
 155                     string() : "[" + opts + "]";
 156         result = subst(result, "$$opts", options);
 157
 158         return result;
 159 }
 160
 161
 162 struct TeXEnvironmentData
 163 {
 164         Layout const * style;
 165         Language const * par_language;
 166         Encoding const * prev_encoding;
 167         bool cjk_nested;
 168         bool leftindent_open;
 169 };
 170
 171
 172 static TeXEnvironmentData prepareEnvironment(Buffer const & buf,
 173                                         Text const & text,
 174                                         ParagraphList::const_iterator pit,
 175                                         otexstream & os,
 176                                         OutputParams const & runparams)
 177 {
 178         TeXEnvironmentData data;
 179
 180         BufferParams const & bparams = buf.params();
 181
 182         // FIXME This test should not be necessary.
 183         // We should perhaps issue an error if it is.
 184         Layout const & style = text.inset().forcePlainLayout() ?
 185                 bparams.documentClass().plainLayout() : pit->layout();
 186
 187         ParagraphList const & paragraphs = text.paragraphs();
 188         bool const firstpar = pit == paragraphs.begin();
 189         ParagraphList::const_iterator const priorpit =
 190                 firstpar ? pit : prev(pit, 1);
 191
 192         OutputState * state = getOutputState();
 193         bool const use_prev_env_language = state->prev_env_language_ != nullptr
 194                         && priorpit->layout().isEnvironment()
 195                         && (priorpit->getDepth() > pit->getDepth()
 196                             || (priorpit->getDepth() == pit->getDepth()
 197                                 && priorpit->layout() != pit->layout()));
 198
 199         data.prev_encoding = runparams.encoding;
 200         data.par_language = pit->getParLanguage(bparams);
 201         Language const * const doc_language = bparams.language;
 202         Language const * const prev_par_language =
 203                 // use font at inset or document language in first paragraph
 204                 firstpar ? (runparams.local_font ?
 205                                     runparams.local_font->language()
 206                                   : doc_language)
 207                          : (use_prev_env_language ?
 208                                     state->prev_env_language_
 209                                   : priorpit->getParLanguage(bparams));
 210
 211         bool const use_polyglossia = runparams.use_polyglossia;
 212         string const par_lang = use_polyglossia ?
 213                 getPolyglossiaEnvName(data.par_language) : data.par_language->babel();
 214         string const prev_par_lang = use_polyglossia ?
 215                 getPolyglossiaEnvName(prev_par_language) : prev_par_language->babel();
 216         string const doc_lang = use_polyglossia ?
 217                 getPolyglossiaEnvName(doc_language) : doc_language->babel();
 218         string const lang_begin_command = use_polyglossia ?
 219                 "\\begin{$$lang}" : lyxrc.language_command_begin;
 220         string const lang_end_command = use_polyglossia ?
 221                 "\\end{$$lang}" : lyxrc.language_command_end;
 222         bool const using_begin_end = use_polyglossia ||
 223                                         !lang_end_command.empty();
 224
 225         // For polyglossia, switch language outside of environment, if possible.
 226         // However, if we are at the start of an inset, do not close languages
 227         // opened outside.
 228         if (par_lang != prev_par_lang) {
 229                 if (!firstpar
 230                     && (!using_begin_end || langOpenedAtThisLevel(state))
 231                     && !lang_end_command.empty()
 232                     && prev_par_lang != doc_lang
 233                     && !prev_par_lang.empty()) {
 234                         os << from_ascii(subst(
 235                                 lang_end_command,
 236                                 "$$lang",
 237                                 prev_par_lang))
 238                           // the '%' is necessary to prevent unwanted whitespace
 239                           << "%\n";
 240                         if (using_begin_end)
 241                                 popLanguageName();
 242                 }
 243
 244                 // If no language was explicitly opened and we are using
 245                 // polyglossia or begin/end commands, then the current
 246                 // language is the document language.
 247                 string const & cur_lang = using_begin_end
 248                                           && !state->lang_switch_depth_.empty()
 249                                                   ? openLanguageName(state)
 250                                                   : doc_lang;
 251
 252                 if ((lang_end_command.empty() ||
 253                     par_lang != doc_lang ||
 254                     par_lang != cur_lang) &&
 255                     !par_lang.empty()) {
 256                             string bc = use_polyglossia ?
 257                                         getPolyglossiaBegin(lang_begin_command, par_lang,
 258                                                             data.par_language->polyglossiaOpts())
 259                                       : subst(lang_begin_command, "$$lang", par_lang);
 260                             os << bc;
 261                             // the '%' is necessary to prevent unwanted whitespace
 262                             os << "%\n";
 263                             if (using_begin_end)
 264                                     pushLanguageName(par_lang);
 265                 }
 266         }
 267
 268         data.leftindent_open = false;
 269         if (!pit->params().leftIndent().zero()) {
 270                 os << "\\begin{LyXParagraphLeftIndent}{"
 271                    << from_ascii(pit->params().leftIndent().asLatexString())
 272                    << "}\n";
 273                 data.leftindent_open = true;
 274         }
 275
 276         if (style.isEnvironment())
 277                 state->nest_level_ += 1;
 278
 279         if (style.isEnvironment() && !style.latexname().empty()) {
 280                 os << "\\begin{" << from_ascii(style.latexname()) << '}';
 281                 if (!style.latexargs().empty()) {
 282                         OutputParams rp = runparams;
 283                         rp.local_font = &pit->getFirstFontSettings(bparams);
 284                         latexArgInsets(paragraphs, pit, os, rp, style.latexargs());
 285                 }
 286                 if (style.latextype == LATEX_LIST_ENVIRONMENT) {
 287                         os << '{'
 288                            << pit->params().labelWidthString()
 289                            << "}\n";
 290                 } else if (style.labeltype == LABEL_BIBLIO) {
 291                         if (pit->params().labelWidthString().empty())
 292                                 os << '{' << bibitemWidest(buf, runparams) << "}\n";
 293                         else
 294                                 os << '{'
 295                                   << pit->params().labelWidthString()
 296                                   << "}\n";
 297                 } else
 298                         os << from_ascii(style.latexparam()) << '\n';
 299                 if (style.latextype == LATEX_BIB_ENVIRONMENT
 300                     || style.latextype == LATEX_ITEM_ENVIRONMENT
 301                     || style.latextype ==  LATEX_LIST_ENVIRONMENT) {
 302                         OutputParams rp = runparams;
 303                         rp.local_font = &pit->getFirstFontSettings(bparams);
 304                         latexArgInsets(paragraphs, pit, os, rp, style.listpreamble(),
 305                                        "listpreamble:");
 306                 }
 307         }
 308         data.style = &style;
 309
 310         // in multilingual environments, the CJK tags have to be nested properly
 311         data.cjk_nested = false;
 312         if (!bparams.useNonTeXFonts
 313             && (bparams.inputenc == "auto-legacy"
 314                         || bparams.inputenc == "auto-legacy-plain")
 315             && data.par_language->encoding()->package() == Encoding::CJK
 316             && state->open_encoding_ != CJK && pit->isMultiLingual(bparams)) {
 317                 if (prev_par_language->encoding()->package() == Encoding::CJK) {
 318                         os << "\\begin{CJK}{"
 319                            << from_ascii(data.par_language->encoding()->latexName())
 320                            << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 321                 }
 322                 state->open_encoding_ = CJK;
 323                 data.cjk_nested = true;
 324         }
 325         return data;
 326 }
 327
 328
 329 static void finishEnvironment(otexstream & os, OutputParams const & runparams,
 330                               TeXEnvironmentData const & data, bool const maintext,
 331                               bool const lastpar)
 332 {
 333         OutputState * state = getOutputState();
 334         // BufferParams const & bparams = buf.params();
 335         // FIXME: for speedup shortcut below, would require passing of "buf" as argument
 336         if (state->open_encoding_ == CJK && data.cjk_nested) {
 337                 // We need to close the encoding even if it does not change
 338                 // to do correct environment nesting
 339                 os << "\\end{CJK}\n";
 340                 state->open_encoding_ = none;
 341         }
 342
 343         if (data.style->isEnvironment()) {
 344                 os << breakln;
 345                 bool const using_begin_end =
 346                         runparams.use_polyglossia ||
 347                                 !lyxrc.language_command_end.empty();
 348                 // Close any language opened at this nest level
 349                 if (using_begin_end) {
 350                         while (langOpenedAtThisLevel(state)) {
 351                                 if (isLocalSwitch(state)) {
 352                                         os << "}";
 353                                 } else {
 354                                         os << "\\end{"
 355                                            << openLanguageName(state)
 356                                            << "}%\n";
 357                                 }
 358                                 popLanguageName();
 359                         }
 360                 }
 361                 if (data.style->latextype == LATEX_BIB_ENVIRONMENT)
 362                         // bibliography needs a blank line after
 363                         // each item for backref to function properly
 364                         // (see #12041)
 365                         os << '\n';
 366                 state->nest_level_ -= 1;
 367                 string const & name = data.style->latexname();
 368                 if (!name.empty())
 369                         os << "\\end{" << from_ascii(name) << "}\n";
 370                 state->prev_env_language_ = data.par_language;
 371                 if (runparams.encoding != data.prev_encoding) {
 372                         runparams.encoding = data.prev_encoding;
 373                         os << setEncoding(data.prev_encoding->iconvName());
 374                 }
 375                 // If this is the last par of an inset, the language needs
 376                 // to be closed after the environment
 377                 if (lastpar && !maintext) {
 378                         if (using_begin_end && langOpenedAtThisLevel(state)) {
 379                                 if (isLocalSwitch(state)) {
 380                                         os << "}";
 381                                 } else {
 382                                         os << "\\end{"
 383                                            << openLanguageName(state)
 384                                            << "}%\n";
 385                                 }
 386                                 popLanguageName();
 387                         }
 388                 }
 389         }
 390
 391         if (data.leftindent_open) {
 392                 os << breakln << "\\end{LyXParagraphLeftIndent}\n";
 393                 state->prev_env_language_ = data.par_language;
 394                 if (runparams.encoding != data.prev_encoding) {
 395                         runparams.encoding = data.prev_encoding;
 396                         os << setEncoding(data.prev_encoding->iconvName());
 397                 }
 398         }
 399
 400         // Check whether we should output a blank line after the environment
 401         if (!data.style->nextnoindent)
 402                 os << '\n';
 403 }
 404
 405
 406 void TeXEnvironment(Buffer const & buf, Text const & text,
 407                     OutputParams const & runparams,
 408                     pit_type & pit, otexstream & os)
 409 {
 410         ParagraphList const & paragraphs = text.paragraphs();
 411         ParagraphList::const_iterator ipar = paragraphs.iterator_at(pit);
 412         LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << pit);
 413
 414         Layout const & current_layout = ipar->layout();
 415         depth_type const current_depth = ipar->params().depth();
 416         Length const & current_left_indent = ipar->params().leftIndent();
 417
 418         // This is for debugging purpose at the end.
 419         pit_type const par_begin = pit;
 420         for (; pit < runparams.par_end; ++pit) {
 421                 ParagraphList::const_iterator par = paragraphs.iterator_at(pit);
 422
 423                 // check first if this is an higher depth paragraph.
 424                 bool go_out = (par->params().depth() < current_depth);
 425                 if (par->params().depth() == current_depth) {
 426                         // This environment is finished.
 427                         go_out |= (par->layout() != current_layout);
 428                         go_out |= (par->params().leftIndent() != current_left_indent);
 429                 }
 430                 if (go_out) {
 431                         // nothing to do here, restore pit and go out.
 432                         pit--;
 433                         break;
 434                 }
 435
 436                 if (par->layout() == current_layout
 437                         && par->params().depth() == current_depth
 438                         && par->params().leftIndent() == current_left_indent) {
 439                         // We are still in the same environment so TeXOnePar and continue;
 440                         TeXOnePar(buf, text, pit, os, runparams);
 441                         continue;
 442                 }
 443
 444                 // We are now in a deeper environment.
 445                 // Either par->layout() != current_layout
 446                 // Or     par->params().depth() > current_depth
 447                 // Or     par->params().leftIndent() != current_left_indent)
 448
 449                 // FIXME This test should not be necessary.
 450                 // We should perhaps issue an error if it is.
 451                 bool const force_plain_layout = text.inset().forcePlainLayout();
 452                 Layout const & style = force_plain_layout
 453                         ? buf.params().documentClass().plainLayout()
 454                         : par->layout();
 455
 456                 if (!style.isEnvironment()) {
 457                         // This is a standard paragraph, no need to call TeXEnvironment.
 458                         TeXOnePar(buf, text, pit, os, runparams);
 459                         continue;
 460                 }
 461
 462                 // Do not output empty environments if the whole paragraph has
 463                 // been deleted with ct and changes are not output.
 464                 bool output_changes;
 465                 if (runparams.for_searchAdv == OutputParams::NoSearch)
 466                         output_changes = buf.params().output_changes;
 467                 else
 468                         output_changes = (runparams.for_searchAdv == OutputParams::SearchWithDeleted);
 469                 if (size_t(pit + 1) < paragraphs.size()) {
 470                         ParagraphList::const_iterator nextpar = paragraphs.iterator_at(pit + 1);
 471                         Paragraph const & cpar = paragraphs.at(pit);
 472                         if ((par->layout() != nextpar->layout()
 473                              || par->params().depth() == nextpar->params().depth()
 474                              || par->params().leftIndent() == nextpar->params().leftIndent())
 475                             && !cpar.empty()
 476                             && cpar.isDeleted(0, cpar.size()) && !output_changes) {
 477                                 if (!output_changes && !cpar.parEndChange().deleted())
 478                                         os << '\n' << '\n';
 479                                 continue;
 480                         }
 481                 }
 482
 483                 // This is a new environment.
 484                 TeXEnvironmentData const data =
 485                         prepareEnvironment(buf, text, par, os, runparams);
 486                 // Recursive call to TeXEnvironment!
 487                 TeXEnvironment(buf, text, runparams, pit, os);
 488                 bool const lastpar = size_t(pit + 1) >= paragraphs.size();
 489                 finishEnvironment(os, runparams, data, text.isMainText(), lastpar);
 490         }
 491
 492         if (pit != runparams.par_end)
 493                 LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << par_begin << " done.");
 494 }
 495
 496
 497 void getArgInsets(otexstream & os, OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs,
 498                   map<size_t, lyx::InsetArgument const *> ilist, vector<string> required, string const & prefix)
 499 {
 500         size_t const argnr = latexargs.size();
 501         if (argnr == 0)
 502                 return;
 503
 504         // Default and preset args are always output, so if they require
 505         // other arguments, consider this.
 506         for (auto const & larg : latexargs) {
 507                 Layout::latexarg const & arg = larg.second;
 508                 if ((!arg.presetarg.empty() || !arg.defaultarg.empty()) && !arg.required.empty()) {
 509                                 vector<string> req = getVectorFromString(arg.required);
 510                                 required.insert(required.end(), req.begin(), req.end());
 511                         }
 512         }
 513
 514         for (size_t i = 1; i <= argnr; ++i) {
 515                 map<size_t, InsetArgument const *>::const_iterator lit = ilist.find(i);
 516                 bool inserted = false;
 517                 if (lit != ilist.end()) {
 518                         InsetArgument const * ins = lit->second;
 519                         if (ins) {
 520                                 Layout::LaTeXArgMap::const_iterator const lait =
 521                                                 latexargs.find(ins->name());
 522                                 if (lait != latexargs.end()) {
 523                                         Layout::latexarg arg = lait->second;
 524                                         docstring ldelim;
 525                                         docstring rdelim;
 526                                         if (!arg.nodelims) {
 527                                                 ldelim = arg.mandatory ?
 528                                                         from_ascii("{") : from_ascii("[");
 529                                                 rdelim = arg.mandatory ?
 530                                                         from_ascii("}") : from_ascii("]");
 531                                         }
 532                                         if (!arg.ldelim.empty())
 533                                                 ldelim = arg.ldelim;
 534                                         if (!arg.rdelim.empty())
 535                                                 rdelim = arg.rdelim;
 536                                         ins->latexArgument(os, runparams, ldelim, rdelim, arg.presetarg);
 537                                         if (prefix == "listpreamble:")
 538                                                 os << breakln;
 539                                         inserted = true;
 540                                 }
 541                         }
 542                 }
 543                 if (!inserted) {
 544                         Layout::LaTeXArgMap::const_iterator lait = latexargs.begin();
 545                         Layout::LaTeXArgMap::const_iterator const laend = latexargs.end();
 546                         for (; lait != laend; ++lait) {
 547                                 string const name = prefix + convert<string>(i);
 548                                 if ((*lait).first == name) {
 549                                         Layout::latexarg arg = (*lait).second;
 550                                         docstring preset = arg.presetarg;
 551                                         if (!arg.defaultarg.empty()) {
 552                                                 if (!preset.empty())
 553                                                         preset += ",";
 554                                                 preset += arg.defaultarg;
 555                                         }
 556                                         if (arg.mandatory) {
 557                                                 docstring ldelim = arg.ldelim.empty() ?
 558                                                                 from_ascii("{") : arg.ldelim;
 559                                                 docstring rdelim = arg.rdelim.empty() ?
 560                                                                 from_ascii("}") : arg.rdelim;
 561                                                 os << ldelim << preset << rdelim;
 562                                         } else if (!preset.empty()) {
 563                                                 docstring ldelim = arg.ldelim.empty() ?
 564                                                                 from_ascii("[") : arg.ldelim;
 565                                                 docstring rdelim = arg.rdelim.empty() ?
 566                                                                 from_ascii("]") : arg.rdelim;
 567                                                 os << ldelim << preset << rdelim;
 568                                         } else if (find(required.begin(), required.end(),
 569                                                    (*lait).first) != required.end()) {
 570                                                 docstring ldelim = arg.ldelim.empty() ?
 571                                                                 from_ascii("[") : arg.ldelim;
 572                                                 docstring rdelim = arg.rdelim.empty() ?
 573                                                                 from_ascii("]") : arg.rdelim;
 574                                                 os << ldelim << rdelim;
 575                                         } else
 576                                                 break;
 577                                 }
 578                         }
 579                 }
 580         }
 581         if ((runparams.for_searchAdv != OutputParams::NoSearch) && argnr > 1) {
 582                 // Mark end of arguments for findadv() only
 583                 os << "\\endarguments{}";
 584         }
 585 }
 586
 587
 588 } // namespace
 589
 590
 591 void pushLanguageName(string const & lang_name, bool localswitch)
 592 {
 593         OutputState * state = getOutputState();
 594
 595         int nest_level = localswitch ? -state->nest_level_ : state->nest_level_;
 596         state->lang_switch_depth_.push(nest_level);
 597         state->open_polyglossia_lang_.push(lang_name);
 598 }
 599
 600
 601 void popLanguageName()
 602 {
 603         OutputState * state = getOutputState();
 604
 605         state->lang_switch_depth_.pop();
 606         state->open_polyglossia_lang_.pop();
 607 }
 608
 609
 610 string const & openLanguageName()
 611 {
 612         OutputState * state = getOutputState();
 613
 614         return openLanguageName(state);
 615 }
 616
 617
 618 namespace {
 619
 620 void addArgInsets(Paragraph const & par, string const & prefix,
 621                  Layout::LaTeXArgMap const & latexargs,
 622                  map<size_t, InsetArgument const *> & ilist,
 623                  vector<string> & required)
 624 {
 625         for (auto const & table : par.insetList()) {
 626                 InsetArgument const * arg = table.inset->asInsetArgument();
 627                 if (!arg)
 628                         continue;
 629                 if (arg->name().empty()) {
 630                         LYXERR0("Error: Unnamed argument inset!");
 631                         continue;
 632                 }
 633                 string const name = prefix.empty() ?
 634                         arg->name() : split(arg->name(), ':');
 635                 size_t const nr = convert<size_t>(name);
 636                 ilist.insert({nr, arg});
 637                 Layout::LaTeXArgMap::const_iterator const lit =
 638                         latexargs.find(arg->name());
 639                 if (lit != latexargs.end()) {
 640                         Layout::latexarg const & larg = lit->second;
 641                         vector<string> req = getVectorFromString(larg.required);
 642                         move(req.begin(), req.end(), back_inserter(required));
 643                 }
 644         }
 645 }
 646
 647 } // namespace
 648
 649
 650 void latexArgInsets(Paragraph const & par, otexstream & os,
 651                     OutputParams const & runparams,
 652                     Layout::LaTeXArgMap const & latexargs,
 653                     string const & prefix)
 654 {
 655         map<size_t, InsetArgument const *> ilist;
 656         vector<string> required;
 657         addArgInsets(par, prefix, latexargs, ilist, required);
 658         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 659 }
 660
 661
 662 void latexArgInsets(ParagraphList const & pars,
 663                     ParagraphList::const_iterator pit,
 664                     otexstream & os, OutputParams const & runparams,
 665                     Layout::LaTeXArgMap const & latexargs,
 666                     string const & prefix)
 667 {
 668         map<size_t, InsetArgument const *> ilist;
 669         vector<string> required;
 670
 671         depth_type const current_depth = pit->params().depth();
 672         Layout const current_layout = pit->layout();
 673
 674         // get the first paragraph in sequence with this layout and depth
 675         ptrdiff_t offset = 0;
 676         while (true) {
 677                 if (prev(pit, offset) == pars.begin())
 678                         break;
 679                 ParagraphList::const_iterator priorpit = prev(pit, offset + 1);
 680                 if (priorpit->layout() == current_layout
 681                     && priorpit->params().depth() == current_depth)
 682                         ++offset;
 683                 else
 684                         break;
 685         }
 686
 687         ParagraphList::const_iterator spit = prev(pit, offset);
 688         for (; spit != pars.end(); ++spit) {
 689                 if (spit->layout() != current_layout ||
 690                     spit->params().depth() < current_depth)
 691                         break;
 692                 if (spit->params().depth() > current_depth)
 693                         continue;
 694                 addArgInsets(*spit, prefix, latexargs, ilist, required);
 695         }
 696         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 697 }
 698
 699
 700 void latexArgInsetsForParent(ParagraphList const & pars, otexstream & os,
 701                              OutputParams const & runparams,
 702                              Layout::LaTeXArgMap const & latexargs,
 703                              string const & prefix)
 704 {
 705         map<size_t, InsetArgument const *> ilist;
 706         vector<string> required;
 707
 708         for (Paragraph const & par : pars) {
 709                 if (par.layout().hasArgs())
 710                         // The InsetArguments inside this paragraph refer to this paragraph
 711                         continue;
 712                 addArgInsets(par, prefix, latexargs, ilist, required);
 713         }
 714         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 715 }
 716
 717
 718 namespace {
 719
 720 // output the proper paragraph start according to latextype.
 721 void parStartCommand(Paragraph const & par, otexstream & os,
 722                      OutputParams const & runparams, Layout const & style)
 723 {
 724         switch (style.latextype) {
 725         case LATEX_COMMAND:
 726                 if (par.needsCProtection(runparams.moving_arg)) {
 727                         if (contains(runparams.active_chars, '^'))
 728                                 // cprotect relies on ^ being on catcode 7
 729                                 os << "\\begingroup\\catcode`\\^=7";
 730                         os << "\\cprotect";
 731                 }
 732                 os << '\\' << from_ascii(style.latexname());
 733
 734                 // Command arguments
 735                 if (!style.latexargs().empty())
 736                         latexArgInsets(par, os, runparams, style.latexargs());
 737                 os << from_ascii(style.latexparam());
 738                 break;
 739         case LATEX_ITEM_ENVIRONMENT:
 740         case LATEX_LIST_ENVIRONMENT:
 741                 if (runparams.for_searchAdv != OutputParams::NoSearch) {
 742                         os << "\\" + style.itemcommand() << "{" << style.latexname() << "}";
 743                 }
 744                 else {
 745                         os << "\\" + style.itemcommand();
 746                         // Item arguments
 747                         if (!style.itemargs().empty())
 748                                 latexArgInsets(par, os, runparams, style.itemargs(), "item:");
 749                         os << " ";
 750                 }
 751                 break;
 752         case LATEX_ENVIRONMENT:
 753                 if (runparams.for_searchAdv != OutputParams::NoSearch) {
 754                         os << "\\latexenvironment{" << style.latexname() << "}{";
 755                 }
 756                 break;
 757         case LATEX_BIB_ENVIRONMENT:
 758                 // ignore this, the inset will write itself
 759                 break;
 760         default:
 761                 break;
 762         }
 763 }
 764
 765 } // namespace
 766
 767 // FIXME: this should be anonymous
 768 void TeXOnePar(Buffer const & buf,
 769                Text const & text,
 770                pit_type pit,
 771                otexstream & os,
 772                OutputParams const & runparams_in,
 773                string const & everypar,
 774                int start_pos, int end_pos,
 775                bool const force)
 776 {
 777         BufferParams const & bparams = runparams_in.is_child
 778                 ? buf.masterParams() : buf.params();
 779         ParagraphList const & paragraphs = text.paragraphs();
 780         Paragraph const & par = paragraphs.at(pit);
 781         // FIXME This check should not really be needed.
 782         // Perhaps we should issue an error if it is.
 783         Layout const & style = text.inset().forcePlainLayout() ?
 784                 bparams.documentClass().plainLayout() : par.layout();
 785
 786         if (style.inpreamble && !force)
 787                 return;
 788
 789         // Do not output empty commands if the whole paragraph has
 790         // been deleted with ct and changes are not output.
 791         if ((runparams_in.for_searchAdv != OutputParams::SearchWithDeleted) && style.latextype != LATEX_ENVIRONMENT
 792             && !par.empty() && par.isDeleted(0, par.size()) && !bparams.output_changes)
 793                 return;
 794
 795         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " ptr " << &par << " '"
 796                 << everypar << "'");
 797
 798         OutputParams runparams = runparams_in;
 799         runparams.isLastPar = (pit == pit_type(paragraphs.size() - 1));
 800         // We reinitialize par begin and end to be on the safe side
 801         // with embedded inset as we don't know if they set those
 802         // value correctly.
 803         runparams.par_begin = 0;
 804         runparams.par_end = 0;
 805
 806         bool const maintext = text.isMainText();
 807         // we are at the beginning of an inset and CJK is already open;
 808         // we count inheritation levels to get the inset nesting right.
 809         OutputState * state = getOutputState();
 810         if (pit == 0 && !maintext
 811             && (state->cjk_inherited_ > 0 || state->open_encoding_ == CJK)) {
 812                 state->cjk_inherited_ += 1;
 813                 state->open_encoding_ = none;
 814         }
 815
 816         // This paragraph is merged and we do not show changes in the output
 817         bool const merged_par = !bparams.output_changes && par.parEndChange().deleted();
 818
 819         if (text.inset().isPassThru()) {
 820                 Font const outerfont = text.outerFont(pit);
 821
 822                 // No newline before first paragraph in this lyxtext
 823                 if (pit > 0 && !text.inset().getLayout().parbreakIgnored() && !merged_par) {
 824                         os << '\n';
 825                         if (!text.inset().getLayout().parbreakIsNewline())
 826                                 os << '\n';
 827                 }
 828
 829                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos, force);
 830                 return;
 831         }
 832
 833         Paragraph const * nextpar = runparams.isLastPar
 834                 ? nullptr : &paragraphs.at(pit + 1);
 835
 836         bool const intitle_command = style.intitle && style.isCommand();
 837         // Intitle commands switch languages locally, thus increase
 838         // language nesting level
 839         if (intitle_command)
 840                 state->nest_level_ += 1;
 841
 842         if (style.pass_thru) {
 843                 Font const outerfont = text.outerFont(pit);
 844                 parStartCommand(par, os, runparams, style);
 845                 if (style.isCommand() && style.needprotect)
 846                         // Due to the moving argument, some fragile
 847                         // commands (labels, index entries)
 848                         // are output after this command (#2154)
 849                         runparams.postpone_fragile_stuff =
 850                                 bparams.postpone_fragile_content;
 851                 if (intitle_command)
 852                         os << '{';
 853
 854                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos, force);
 855
 856                 // I did not create a parEndCommand for this minuscule
 857                 // task because in the other user of parStartCommand
 858                 // the code is different (JMarc)
 859                 if (style.isCommand()) {
 860                         os << "}";
 861                         if (par.needsCProtection(runparams.moving_arg)
 862                             && contains(runparams.active_chars, '^'))
 863                                 os << "\\endgroup";
 864                         if (merged_par)
 865                                 os << "{}";
 866                         else
 867                                 os << "\n";
 868                 }
 869                 else if (!merged_par)
 870                         os << '\n';
 871                 if (!style.parbreak_is_newline && !merged_par) {
 872                         os << '\n';
 873                 } else if (nextpar && !style.isEnvironment()) {
 874                         Layout const nextstyle = text.inset().forcePlainLayout()
 875                                 ? bparams.documentClass().plainLayout()
 876                                 : nextpar->layout();
 877                         if (nextstyle.name() != style.name() && !merged_par)
 878                                 os << '\n';
 879                 }
 880
 881                 return;
 882         }
 883
 884         // This paragraph's language
 885         Language const * const par_language = par.getParLanguage(bparams);
 886         Language const * const nextpar_language = nextpar ?
 887                 nextpar->getParLanguage(bparams) : nullptr;
 888         // The document's language
 889         Language const * const doc_language = bparams.language;
 890         // The language that was in effect when the environment this paragraph is
 891         // inside of was opened
 892         Language const * const outer_language =
 893                 (runparams.local_font != nullptr) ?
 894                         runparams.local_font->language() : doc_language;
 895
 896         Paragraph const * priorpar = (pit == 0) ? nullptr : &paragraphs.at(pit - 1);
 897
 898         // The previous language that was in effect is the language of the
 899         // previous paragraph, unless the previous paragraph is inside an
 900         // environment with nesting depth greater than (or equal to, but with
 901         // a different layout) the current one. If there is no previous
 902         // paragraph, the previous language is the outer language.
 903         // Note further that we take the outer language also if the prior par
 904         // is PassThru, since in that case it has latex_language, and all secondary
 905         // languages have been closed (#10793).
 906         bool const use_prev_env_language = state->prev_env_language_ != nullptr
 907                         && priorpar
 908                         && priorpar->layout().isEnvironment()
 909                         && (priorpar->getDepth() > par.getDepth()
 910                             || (priorpar->getDepth() == par.getDepth()
 911                                 && priorpar->layout() != par.layout()));
 912
 913         // We need to ignore previous intitle commands since languages
 914         // are switched locally there (# 11514)
 915         // There might be paragraphs before the title, so we check this.
 916         Paragraph * prior_nontitle_par = nullptr;
 917         if (!intitle_command) {
 918                 pit_type ppit = pit;
 919                 while (ppit > 0) {
 920                         --ppit;
 921                         Paragraph const * tmppar = &paragraphs.at(ppit);
 922                         if (tmppar->layout().intitle && tmppar->layout().isCommand())
 923                                 continue;
 924                         prior_nontitle_par = const_cast<Paragraph*>(tmppar);
 925                         break;
 926                 }
 927         }
 928         Language const * const prev_language =
 929                 runparams_in.for_searchAdv != OutputParams::NoSearch
 930                         ? languages.getLanguage("ignore")
 931                         : (prior_nontitle_par && !prior_nontitle_par->isPassThru())
 932                                 ? (use_prev_env_language
 933                                         ? state->prev_env_language_
 934                                         : prior_nontitle_par->getParLanguage(bparams))
 935                                 : outer_language;
 936
 937         bool const use_polyglossia = runparams.use_polyglossia;
 938         string const par_lang = use_polyglossia ?
 939                 getPolyglossiaEnvName(par_language): par_language->babel();
 940         string const prev_lang = use_polyglossia ?
 941                 getPolyglossiaEnvName(prev_language) : prev_language->babel();
 942         string const outer_lang = use_polyglossia ?
 943                 getPolyglossiaEnvName(outer_language) : outer_language->babel();
 944         string const nextpar_lang = nextpar_language ? (use_polyglossia ?
 945                 getPolyglossiaEnvName(nextpar_language) :
 946                 nextpar_language->babel()) : string();
 947         string lang_begin_command = use_polyglossia ?
 948                 "\\begin{$$lang}$$opts" : lyxrc.language_command_begin;
 949         string lang_end_command = use_polyglossia ?
 950                 "\\end{$$lang}" : lyxrc.language_command_end;
 951         // the '%' is necessary to prevent unwanted whitespace
 952         string lang_command_termination = "%\n";
 953         bool const using_begin_end = use_polyglossia ||
 954                                         !lang_end_command.empty();
 955
 956         // For InTitle commands, we need to switch the language inside the command
 957         // (see #10849); thus open the command here.
 958         if (intitle_command) {
 959                 parStartCommand(par, os, runparams, style);
 960                 if (style.isCommand() && style.needprotect)
 961                         // Due to the moving argument, some fragile
 962                         // commands (labels, index entries)
 963                         // are output after this command (#2154)
 964                         runparams.postpone_fragile_stuff =
 965                                 bparams.postpone_fragile_content;
 966                 os << '{';
 967         }
 968
 969         // In some insets (such as Arguments), we cannot use \selectlanguage.
 970         // Also, if an RTL language is set via environment in polyglossia,
 971         // only a nested \\text<lang> command will reset the direction for LTR
 972         // languages (see # 10111).
 973         bool const in_polyglossia_rtl_env =
 974                 use_polyglossia
 975                 && runparams.local_font != nullptr
 976                 && outer_language->rightToLeft()
 977                 && !par_language->rightToLeft();
 978         bool const localswitch =
 979                         (runparams_in.for_searchAdv != OutputParams::NoSearch
 980                         || text.inset().forceLocalFontSwitch()
 981                         || (using_begin_end && text.inset().forcePlainLayout())
 982                         || in_polyglossia_rtl_env)
 983                         && !text.inset().forceParDirectionSwitch();
 984         if (localswitch) {
 985                 lang_begin_command = use_polyglossia ?
 986                             "\\text$$lang$$opts{" : lyxrc.language_command_local;
 987                 lang_end_command = "}";
 988                 lang_command_termination.clear();
 989         }
 990
 991         bool const localswitch_needed = localswitch && par_lang != outer_lang;
 992
 993         // localswitches need to be closed and reopened at each par
 994         if ((runparams_in.for_searchAdv != OutputParams::NoSearch) || ((par_lang != prev_lang || localswitch_needed)
 995              // check if we already put language command in TeXEnvironment()
 996              && !(style.isEnvironment()
 997                   && (pit == 0 || (priorpar->layout() != par.layout()
 998                                    && priorpar->getDepth() <= par.getDepth())
 999                       || priorpar->getDepth() < par.getDepth())))) {
1000                 if (!localswitch
1001                     && (!using_begin_end || langOpenedAtThisLevel(state))
1002                     && !lang_end_command.empty()
1003                     && prev_lang != outer_lang
1004                     && !prev_lang.empty()
1005                     && (!using_begin_end || !style.isEnvironment())) {
1006                         os << from_ascii(subst(lang_end_command,
1007                                                "$$lang",
1008                                                prev_lang))
1009                            << lang_command_termination;
1010                         if (using_begin_end)
1011                                 popLanguageName();
1012                 }
1013
1014                 // We need to open a new language if we couldn't close the previous
1015                 // one (because there's no language_command_end); and even if we closed
1016                 // the previous one, if the current language is different than the
1017                 // outer_language (which is currently in effect once the previous one
1018                 // is closed).
1019                 if ((lang_end_command.empty() || par_lang != outer_lang
1020                      || (!using_begin_end
1021                          || (style.isEnvironment() && par_lang != prev_lang)))
1022                         && !par_lang.empty()) {
1023                         // If we're inside an inset, and that inset is within an \L or \R
1024                         // (or equivalents), then within the inset, too, any opposite
1025                         // language paragraph should appear within an \L or \R (in addition
1026                         // to, outside of, the normal language switch commands).
1027                         // This behavior is not correct for ArabTeX, though.
1028                         if (!using_begin_end
1029                             // not for ArabTeX
1030                             && par_language->lang() != "arabic_arabtex"
1031                             && outer_language->lang() != "arabic_arabtex"
1032                             // are we in an inset?
1033                             && runparams.local_font != nullptr
1034                             // is the inset within an \L or \R?
1035                             //
1036                             // FIXME: currently, we don't check this; this means that
1037                             // we'll have unnnecessary \L and \R commands, but that
1038                             // doesn't seem to hurt (though latex will complain)
1039                             //
1040                             // is this paragraph in the opposite direction?
1041                             && runparams.local_font->isRightToLeft() != par_language->rightToLeft()) {
1042                                 // FIXME: I don't have a working copy of the Arabi package, so
1043                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
1044                                 // or not...
1045                                 if (par_language->lang() == "farsi")
1046                                         os << "\\textFR{";
1047                                 else if (outer_language->lang() == "farsi")
1048                                         os << "\\textLR{";
1049                                 else if (par_language->lang() == "arabic_arabi")
1050                                         os << "\\textAR{";
1051                                 else if (outer_language->lang() == "arabic_arabi")
1052                                         os << "\\textLR{";
1053                                 // remaining RTL languages currently is hebrew
1054                                 else if (par_language->rightToLeft())
1055                                         os << "\\R{";
1056                                 else
1057                                         os << "\\L{";
1058                         }
1059                         // With CJK, the CJK tag has to be closed first (see below)
1060                         if ((runparams.encoding->package() != Encoding::CJK
1061                                  || bparams.useNonTeXFonts
1062                                  || (runparams.for_searchAdv != OutputParams::NoSearch))
1063                             && (par_lang != openLanguageName(state) || localswitch || intitle_command)
1064                             && !par_lang.empty()) {
1065                                 string bc = use_polyglossia ?
1066                                           getPolyglossiaBegin(lang_begin_command, par_lang,
1067                                                               par_language->polyglossiaOpts(),
1068                                                               localswitch)
1069                                           : subst(lang_begin_command, "$$lang", par_lang);
1070                                 os << bc;
1071                                 os << lang_command_termination;
1072                                 if (using_begin_end)
1073                                         pushLanguageName(par_lang, localswitch);
1074                         }
1075                 }
1076         }
1077
1078         // Switch file encoding if necessary; no need to do this for "auto-legacy-plain"
1079         // encoding, since this only affects the position of the outputted
1080         // \inputencoding command; the encoding switch will occur when necessary
1081         if (bparams.inputenc == "auto-legacy"
1082                 && !runparams.isFullUnicode() // Xe/LuaTeX use one document-wide encoding  (see also switchEncoding())
1083                 && runparams.encoding->package() != Encoding::japanese
1084                 && runparams.encoding->package() != Encoding::none) {
1085                 // Look ahead for future encoding changes.
1086                 // We try to output them at the beginning of the paragraph,
1087                 // since the \inputencoding command is not allowed e.g. in
1088                 // sections. For this reason we only set runparams.moving_arg
1089                 // after checking for the encoding change, otherwise the
1090                 // change would be always avoided by switchEncoding().
1091                 for (pos_type i = 0; i < par.size(); ++i) {
1092                         char_type const c = par.getChar(i);
1093                         Encoding const * const encoding =
1094                                 par.getFontSettings(bparams, i).language()->encoding();
1095                         if (encoding->package() != Encoding::CJK
1096                                 && runparams.encoding->package() == Encoding::inputenc
1097                                 && isASCII(c))
1098                                 continue;
1099                         if (par.isInset(i))
1100                                 break;
1101                         // All characters before c are in the ASCII range, and
1102                         // c is non-ASCII (but no inset), so change the
1103                         // encoding to that required by the language of c.
1104                         // With CJK, only add switch if we have CJK content at the beginning
1105                         // of the paragraph
1106                         if (i != 0 && encoding->package() == Encoding::CJK)
1107                                 continue;
1108
1109                         pair<bool, int> enc_switch = switchEncoding(os.os(),
1110                                                 bparams, runparams, *encoding);
1111                         // the following is necessary after a CJK environment in a multilingual
1112                         // context (nesting issue).
1113                         if (par_language->encoding()->package() == Encoding::CJK
1114                                 && state->open_encoding_ != CJK && state->cjk_inherited_ == 0) {
1115                                 os << "\\begin{CJK}{"
1116                                    << from_ascii(par_language->encoding()->latexName())
1117                                    << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
1118                                 state->open_encoding_ = CJK;
1119                         }
1120                         if (encoding->package() != Encoding::none && enc_switch.first) {
1121                                 if (enc_switch.second > 0) {
1122                                         // the '%' is necessary to prevent unwanted whitespace
1123                                         os << "%\n";
1124                                 }
1125                                 // With CJK, the CJK tag had to be closed first (see above)
1126                                 if (runparams.encoding->package() == Encoding::CJK
1127                                     && par_lang != openLanguageName(state)
1128                                     && !par_lang.empty()) {
1129                                         os << subst(lang_begin_command, "$$lang", par_lang)
1130                                            << lang_command_termination;
1131                                         if (using_begin_end)
1132                                                 pushLanguageName(par_lang, localswitch);
1133                                 }
1134                                 runparams.encoding = encoding;
1135                         }
1136                         break;
1137                 }
1138         }
1139
1140         runparams.moving_arg |= style.needprotect;
1141         if (style.needmboxprotect)
1142                 ++runparams.inulemcmd;
1143         Encoding const * const prev_encoding = runparams.encoding;
1144
1145         bool const useSetSpace = bparams.documentClass().provides("SetSpace");
1146         if (par.allowParagraphCustomization()) {
1147                 if (par.params().startOfAppendix()) {
1148                         os << "\n\\appendix\n";
1149                 }
1150
1151                 // InTitle commands must use switches (not environments)
1152                 // inside the commands (see #9332)
1153                 if (style.intitle) {
1154                         if (!par.params().spacing().isDefault())
1155                         {
1156                                 if (runparams.moving_arg)
1157                                         os << "\\protect";
1158                                 os << from_ascii(par.params().spacing().writeCmd(useSetSpace));
1159                         }
1160                 } else {
1161                         if (!par.params().spacing().isDefault()
1162                                 && (pit == 0 || !priorpar->hasSameLayout(par)))
1163                         {
1164                                 os << from_ascii(par.params().spacing().writeEnvirBegin(useSetSpace))
1165                                     << '\n';
1166                         }
1167
1168                         if (style.isCommand()) {
1169                                 os << '\n';
1170                         }
1171                 }
1172         }
1173
1174         // For InTitle commands, we already started the command before
1175         // the language switch
1176         if (!intitle_command) {
1177                 parStartCommand(par, os, runparams, style);
1178                 if (style.isCommand() && style.needprotect)
1179                         // Due to the moving argument, some fragile
1180                         // commands (labels, index entries)
1181                         // are output after this command (#2154)
1182                         runparams.postpone_fragile_stuff =
1183                                 bparams.postpone_fragile_content;
1184         }
1185
1186         Font const outerfont = text.outerFont(pit);
1187
1188         // FIXME UNICODE
1189         os << from_utf8(everypar);
1190         par.latex(bparams, outerfont, os, runparams, start_pos, end_pos, force);
1191
1192         Font const font = par.empty()
1193                  ? par.getLayoutFont(bparams, outerfont)
1194                  : par.getFont(bparams, par.size() - 1, outerfont);
1195
1196         bool const is_command = style.isCommand();
1197
1198         // InTitle commands need to be closed after the language has been closed.
1199         if (!intitle_command) {
1200                 if (is_command) {
1201                         os << '}';
1202                         if (!style.postcommandargs().empty())
1203                                 latexArgInsets(par, os, runparams, style.postcommandargs(), "post:");
1204                         if (!runparams.post_macro.empty()) {
1205                                 // Output the stored fragile commands (labels, indices etc.)
1206                                 // that need to be output after the command with moving argument.
1207                                 os << runparams.post_macro;
1208                                 runparams.post_macro.clear();
1209                         }
1210                         if (par.needsCProtection(runparams.moving_arg)
1211                             && contains(runparams.active_chars, '^'))
1212                                 os << "\\endgroup";
1213                         if (runparams.encoding != prev_encoding) {
1214                                 runparams.encoding = prev_encoding;
1215                                 os << setEncoding(prev_encoding->iconvName());
1216                         }
1217                 }
1218         }
1219
1220         bool pending_newline = false;
1221         bool unskip_newline = false;
1222         bool close_lang_switch = false;
1223         switch (style.latextype) {
1224         case LATEX_ITEM_ENVIRONMENT:
1225         case LATEX_LIST_ENVIRONMENT:
1226                 if ((nextpar && par_lang != nextpar_lang
1227                              && nextpar->getDepth() == par.getDepth())
1228                     || (atSameLastLangSwitchDepth(state) && nextpar
1229                             && nextpar->getDepth() < par.getDepth()))
1230                         close_lang_switch = using_begin_end;
1231                 if (nextpar && par.params().depth() < nextpar->params().depth())
1232                         pending_newline = !text.inset().getLayout().parbreakIgnored() && !merged_par;
1233                 break;
1234         case LATEX_ENVIRONMENT: {
1235                 // if it's the last paragraph of the current environment
1236                 // skip it otherwise fall through
1237                 if (nextpar
1238                     && ((nextpar->layout() != par.layout()
1239                            || nextpar->params().depth() != par.params().depth())
1240                         || (!using_begin_end || par_lang != nextpar_lang)))
1241                 {
1242                         close_lang_switch = using_begin_end;
1243                         break;
1244                 }
1245         }
1246         // possible
1247         // fall through
1248         default:
1249                 // we don't need it for the last paragraph and in InTitle commands!!!
1250                 if (nextpar && !intitle_command)
1251                         pending_newline = !text.inset().getLayout().parbreakIgnored() && !merged_par;
1252         }
1253
1254         // InTitle commands use switches (not environments) for space settings
1255         if (par.allowParagraphCustomization() && !style.intitle) {
1256                 if (!par.params().spacing().isDefault()
1257                         && (runparams.isLastPar || !nextpar->hasSameLayout(par))) {
1258                         if (pending_newline)
1259                                 os << '\n';
1260
1261                         string const endtag =
1262                                 par.params().spacing().writeEnvirEnd(useSetSpace);
1263                         if (prefixIs(endtag, "\\end{"))
1264                                 os << breakln;
1265
1266                         os << from_ascii(endtag);
1267                         pending_newline = true;
1268                 }
1269         }
1270
1271         // Closing the language is needed for the last paragraph in a given language
1272         // as well as for any InTitleCommand (since these set the language locally);
1273         // it is also needed if we're within an \L or \R that we may have opened above
1274         // (not necessarily in this paragraph) and are about to close.
1275         bool closing_rtl_ltr_environment = !using_begin_end
1276                 // not for ArabTeX
1277                 && (par_language->lang() != "arabic_arabtex"
1278                     && outer_language->lang() != "arabic_arabtex")
1279                 // have we opened an \L or \R environment?
1280                 && runparams.local_font != nullptr
1281                 && runparams.local_font->isRightToLeft() != par_language->rightToLeft()
1282                 // are we about to close the language?
1283                 &&((nextpar && par_lang != nextpar_lang)
1284                    || (runparams.isLastPar && par_lang != outer_lang));
1285
1286         if (localswitch_needed
1287             || (intitle_command && using_begin_end)
1288             || closing_rtl_ltr_environment
1289             || (((runparams.isLastPar && !runparams.inbranch) || close_lang_switch)
1290                 && (par_lang != outer_lang || (using_begin_end
1291                                                 && style.isEnvironment()
1292                                                 && par_lang != nextpar_lang)))) {
1293                 // Since \selectlanguage write the language to the aux file,
1294                 // we need to reset the language at the end of footnote or
1295                 // float.
1296
1297                 if (!localswitch && (pending_newline || close_lang_switch))
1298                         os << '\n';
1299
1300                 // when the paragraph uses CJK, the language has to be closed earlier
1301                 if ((font.language()->encoding()->package() != Encoding::CJK)
1302                         || bparams.useNonTeXFonts
1303                         || (runparams_in.for_searchAdv != OutputParams::NoSearch)) {
1304                         if (lang_end_command.empty()) {
1305                                 // If this is a child, we should restore the
1306                                 // master language after the last paragraph.
1307                                 Language const * const current_language =
1308                                         (runparams.isLastPar && runparams.master_language)
1309                                                 ? runparams.master_language
1310                                                 : outer_language;
1311                                 string const current_lang = use_polyglossia
1312                                         ? getPolyglossiaEnvName(current_language)
1313                                         : current_language->babel();
1314                                 if (!current_lang.empty()
1315                                     && current_lang != openLanguageName(state)) {
1316                                         string bc = use_polyglossia ?
1317                                                     getPolyglossiaBegin(lang_begin_command, current_lang,
1318                                                                         current_language->polyglossiaOpts(),
1319                                                                         localswitch)
1320                                                   : subst(lang_begin_command, "$$lang", current_lang);
1321                                         os << bc;
1322                                         pending_newline = !localswitch
1323                                                         && !text.inset().getLayout().parbreakIgnored();
1324                                         unskip_newline = !localswitch;
1325                                         if (using_begin_end)
1326                                                 pushLanguageName(current_lang, localswitch);
1327                                 }
1328                         } else if ((!using_begin_end ||
1329                                     langOpenedAtThisLevel(state)) &&
1330                                    !par_lang.empty()) {
1331                                 // If we are in an environment, we have to
1332                                 // close the "outer" language afterwards
1333                                 string const & cur_lang = openLanguageName(state);
1334                                 if (!style.isEnvironment()
1335                                     || (close_lang_switch
1336                                         && atSameLastLangSwitchDepth(state)
1337                                         && par_lang != outer_lang
1338                                         && (par_lang != cur_lang
1339                                             || (cur_lang != outer_lang
1340                                                 && nextpar
1341                                                 && style != nextpar->layout())))
1342                                     || (atSameLastLangSwitchDepth(state)
1343                                         && !state->lang_switch_depth_.empty()
1344                                         && cur_lang != par_lang)
1345                                     || in_polyglossia_rtl_env)
1346                                 {
1347                                         if (using_begin_end && !localswitch)
1348                                                 os << breakln;
1349                                         os << from_ascii(subst(
1350                                                 lang_end_command,
1351                                                 "$$lang",
1352                                                 par_lang));
1353                                         pending_newline = !localswitch
1354                                                         && !text.inset().getLayout().parbreakIgnored();
1355                                         unskip_newline = !localswitch;
1356                                         if (using_begin_end)
1357                                                 popLanguageName();
1358                                 }
1359                         }
1360                 }
1361         }
1362         if (closing_rtl_ltr_environment)
1363                 os << "}";
1364
1365         // InTitle commands need to be closed after the language has been closed.
1366         if (intitle_command) {
1367                 os << '}';
1368                 if (!style.postcommandargs().empty())
1369                         latexArgInsets(par, os, runparams, style.postcommandargs(), "post:");
1370                 if (!runparams.post_macro.empty()) {
1371                         // Output the stored fragile commands (labels, indices etc.)
1372                         // that need to be output after the command with moving argument.
1373                         os << runparams.post_macro;
1374                         runparams.post_macro.clear();
1375                 }
1376                 if (par.needsCProtection(runparams.moving_arg)
1377                     && contains(runparams.active_chars, '^'))
1378                         os << "\\endgroup";
1379                 if (runparams.encoding != prev_encoding) {
1380                         runparams.encoding = prev_encoding;
1381                         os << setEncoding(prev_encoding->iconvName());
1382                 }
1383         }
1384
1385         bool const last_was_separator =
1386                 !par.empty() && par.isEnvSeparator(par.size() - 1);
1387
1388         // Signify added/deleted par break in output if show changes in output
1389         if (nextpar && !os.afterParbreak() && !last_was_separator
1390             && bparams.output_changes && par.parEndChange().changed()) {
1391                 Changes::latexMarkChange(os, bparams, Change(Change::UNCHANGED),
1392                                          par.parEndChange(), runparams);
1393                 os << bparams.encoding().latexString(docstring(1, 0x00b6)).first << "}";
1394         }
1395
1396         if (pending_newline) {
1397                 if (unskip_newline)
1398                         // prevent unwanted whitespace
1399                         os << '%';
1400                 if (!os.afterParbreak() && !last_was_separator)
1401                         os << '\n';
1402         }
1403
1404         // if this is a CJK-paragraph and the next isn't, close CJK
1405         // also if the next paragraph is a multilingual environment (because of nesting)
1406         if (nextpar && state->open_encoding_ == CJK
1407                 && bparams.encoding().iconvName() != "UTF-8"
1408                 && bparams.encoding().package() != Encoding::CJK
1409                 && ((nextpar_language &&
1410                         nextpar_language->encoding()->package() != Encoding::CJK)
1411                         || (nextpar->layout().isEnvironment() && nextpar->isMultiLingual(bparams)))
1412                 // inbetween environments, CJK has to be closed later (nesting!)
1413                 && (!style.isEnvironment() || !nextpar->layout().isEnvironment())) {
1414                 os << "\\end{CJK}\n";
1415                 state->open_encoding_ = none;
1416         }
1417
1418         // If this is the last paragraph, close the CJK environment
1419         // if necessary. If it's an environment or nested in an environment,
1420         // we'll have to \end that first.
1421         if (runparams.isLastPar && !style.isEnvironment()
1422                 && par.params().depth() < 1) {
1423                 switch (state->open_encoding_) {
1424                         case CJK: {
1425                                 // do nothing at the end of child documents
1426                                 if (maintext && buf.masterBuffer() != &buf)
1427                                         break;
1428                                 // end of main text: also insert a \clearpage (see #5386)
1429                                 if (maintext) {
1430                                         os << "\n\\clearpage\n\\end{CJK}\n";
1431                                 // end of an inset
1432                                 } else
1433                                         os << "\\end{CJK}";
1434                                 state->open_encoding_ = none;
1435                                 break;
1436                         }
1437                         case inputenc: {
1438                                 // FIXME: If we are in an inset and the switch happened outside this inset,
1439                                 // do not switch back at the end of the inset (bug #8479)
1440                                 // The following attempt does not help with listings-caption in a CJK document:
1441                                 // if (runparams_in.local_font != 0
1442                                 //    && runparams_in.encoding == runparams_in.local_font->language()->encoding())
1443                                 //      break;
1444                                 os << "\\egroup";
1445                                 state->open_encoding_ = none;
1446                                 break;
1447                         }
1448                         case none:
1449                         default:
1450                                 // do nothing
1451                                 break;
1452                 }
1453         }
1454
1455         // Information about local language is stored as a font feature.
1456         // If this is the last paragraph of the inset and a local_font was set upon entering
1457         // and we are mixing encodings ("auto-legacy" or "auto-legacy-plain" and no XeTeX or LuaTeX),
1458         // ensure the encoding is set back to the default encoding of the local language.
1459         if (runparams.isLastPar && runparams_in.local_font != nullptr
1460             && runparams_in.encoding != runparams_in.local_font->language()->encoding()
1461             && (bparams.inputenc == "auto-legacy" || bparams.inputenc == "auto-legacy-plain")
1462                 && !runparams.isFullUnicode()
1463            ) {
1464                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
1465                 os << setEncoding(runparams_in.encoding->iconvName());
1466         }
1467         // Otherwise, the current encoding should be set for the next paragraph.
1468         else
1469                 runparams_in.encoding = runparams.encoding;
1470
1471         // Also pass the post_macros upstream
1472         runparams_in.post_macro = runparams.post_macro;
1473         // These need to be passed upstream as well
1474         runparams_in.need_maketitle = runparams.need_maketitle;
1475         runparams_in.have_maketitle = runparams.have_maketitle;
1476
1477
1478         // we don't need a newline for the last paragraph!!!
1479         // Note from JMarc: we will re-add a \n explicitly in
1480         // TeXEnvironment, because it is needed in this case
1481         if (nextpar && !os.afterParbreak() && !last_was_separator) {
1482                 if (!text.inset().getLayout().parbreakIgnored() && !merged_par)
1483                         // Make sure to start a new line
1484                         os << breakln;
1485                 // A newline '\n' is always output before a command,
1486                 // so avoid doubling it.
1487                 Layout const & next_layout = nextpar->layout();
1488                 if (!next_layout.isCommand()) {
1489                         // Here we now try to avoid spurious empty lines by
1490                         // outputting a paragraph break only if: (case 1) the
1491                         // paragraph style allows parbreaks and no \begin, \end
1492                         // or \item tags are going to follow (i.e., if the next
1493                         // isn't the first or the current isn't the last
1494                         // paragraph of an environment or itemize) and the
1495                         // depth and alignment of the following paragraph is
1496                         // unchanged, or (case 2) the following is a
1497                         // non-environment paragraph whose depth is increased
1498                         // but whose alignment is unchanged, or (case 3) the
1499                         // paragraph is not an environment and the next one is a
1500                         // non-itemize-like env at lower depth, or (case 4) the
1501                         // paragraph is a command not followed by an environment
1502                         // and the alignment of the current and next paragraph
1503                         // is unchanged, or (case 5) the current alignment is
1504                         // changed and a standard paragraph follows.
1505                         DocumentClass const & tclass = bparams.documentClass();
1506                         if ((style == next_layout
1507                              && !style.parbreak_is_newline
1508                              && !text.inset().getLayout().parbreakIsNewline()
1509                              && !text.inset().getLayout().parbreakIgnored()
1510                              && style.latextype != LATEX_ITEM_ENVIRONMENT
1511                              && style.latextype != LATEX_LIST_ENVIRONMENT
1512                              && style.align == par.getAlign(bparams)
1513                              && nextpar->getDepth() == par.getDepth()
1514                              && nextpar->getAlign(bparams) == par.getAlign(bparams))
1515                             || (!next_layout.isEnvironment()
1516                                 && nextpar->getDepth() > par.getDepth()
1517                                 && nextpar->getAlign(bparams) == next_layout.align)
1518                             || (!style.isEnvironment()
1519                                 && next_layout.latextype == LATEX_ENVIRONMENT
1520                                 && nextpar->getDepth() < par.getDepth())
1521                             || (style.isCommand()
1522                                 && !next_layout.isEnvironment()
1523                                 && style.align == par.getAlign(bparams)
1524                                 && next_layout.align == nextpar->getAlign(bparams))
1525                             || (style.align != par.getAlign(bparams)
1526                                 && tclass.isDefaultLayout(next_layout))) {
1527                                 // and omit paragraph break if it has been deleted with ct
1528                                 // and changes are not shown in output
1529                                 if (!merged_par) {
1530                                         if (runparams.isNonLong)
1531                                                 // This is to allow parbreak in multirow
1532                                                 // It could also be used for other non-long
1533                                                 // contexts
1534                                                 os << "\\endgraf\n";
1535                                         else
1536                                                 os << '\n';
1537                                 }
1538                         }
1539                 }
1540         }
1541
1542         // Reset language nesting level after intitle command
1543         if (intitle_command)
1544                 state->nest_level_ -= 1;
1545
1546         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " done; ptr "
1547                 << &par << " next " << nextpar);
1548
1549         return;
1550 }
1551
1552
1553 // LaTeX all paragraphs
1554 void latexParagraphs(Buffer const & buf,
1555                      Text const & text,
1556                      otexstream & os,
1557                      OutputParams const & runparams,
1558                      string const & everypar)
1559 {
1560         LASSERT(runparams.par_begin <= runparams.par_end,
1561                 { os << "% LaTeX Output Error\n"; return; } );
1562
1563         BufferParams const & bparams = buf.params();
1564         BufferParams const & mparams = buf.masterParams();
1565
1566         bool const maintext = text.isMainText();
1567         bool const is_child = buf.masterBuffer() != &buf;
1568         bool const multibib_child = maintext && is_child
1569                         && mparams.multibib == "child";
1570
1571         if (multibib_child && mparams.useBiblatex())
1572                 os << "\\newrefsection";
1573         else if (multibib_child && mparams.useBibtopic()
1574                  && !buf.masterBibInfo().empty()) {
1575                 os << "\\begin{btUnit}\n";
1576                 runparams.openbtUnit = true;
1577         }
1578
1579         // Open a CJK environment at the beginning of the main buffer
1580         // if the document's main encoding requires the CJK package
1581         // or the document encoding is utf8 and the CJK package is required
1582         // (but not in child documents or documents using system fonts):
1583         OutputState * state = getOutputState();
1584         if (maintext && !is_child && !bparams.useNonTeXFonts
1585             && (bparams.encoding().package() == Encoding::CJK
1586                         || (bparams.encoding().name() == "utf8"
1587                                 && runparams.use_CJK))
1588            ) {
1589                 docstring const cjkenc = bparams.encoding().iconvName() == "UTF-8"
1590                                                                  ? from_ascii("UTF8")
1591                                                                  : from_ascii(bparams.encoding().latexName());
1592                 os << "\\begin{CJK}{" << cjkenc
1593                    << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
1594                 state->open_encoding_ = CJK;
1595         }
1596         // if "auto begin" is switched off, explicitly switch the
1597         // language on at start
1598         string const mainlang = runparams.use_polyglossia
1599                 ? getPolyglossiaEnvName(bparams.language)
1600                 : bparams.language->babel();
1601         string const lang_begin_command = runparams.use_polyglossia ?
1602                 "\\begin{$$lang}$$opts" : lyxrc.language_command_begin;
1603         string const lang_end_command = runparams.use_polyglossia ?
1604                 "\\end{$$lang}" : lyxrc.language_command_end;
1605         bool const using_begin_end = runparams.use_polyglossia ||
1606                                         !lang_end_command.empty();
1607
1608         if (maintext && !lyxrc.language_auto_begin &&
1609             !mainlang.empty()) {
1610                 // FIXME UNICODE
1611                 string bc = runparams.use_polyglossia ?
1612                             getPolyglossiaBegin(lang_begin_command, mainlang,
1613                                                 bparams.language->polyglossiaOpts())
1614                           : subst(lang_begin_command, "$$lang", mainlang);
1615                 os << bc;
1616                 os << '\n';
1617                 if (using_begin_end)
1618                         pushLanguageName(mainlang);
1619         }
1620
1621         ParagraphList const & paragraphs = text.paragraphs();
1622
1623         if (runparams.par_begin == runparams.par_end) {
1624                 // The full doc will be exported but it is easier to just rely on
1625                 // runparams range parameters that will be passed TeXEnvironment.
1626                 runparams.par_begin = 0;
1627                 runparams.par_end = static_cast<int>(paragraphs.size());
1628         }
1629
1630         pit_type pit = runparams.par_begin;
1631         // lastpit is for the language check after the loop.
1632         pit_type lastpit = pit;
1633         DocumentClass const & tclass = bparams.documentClass();
1634
1635         // Did we already warn about inTitle layout mixing? (we only warn once)
1636         bool gave_layout_warning = false;
1637         for (; pit < runparams.par_end; ++pit) {
1638                 lastpit = pit;
1639                 ParagraphList::const_iterator par = paragraphs.iterator_at(pit);
1640
1641                 // FIXME This check should not be needed. We should
1642                 // perhaps issue an error if it is.
1643                 Layout const & layout = text.inset().forcePlainLayout() ?
1644                                 tclass.plainLayout() : par->layout();
1645
1646                 if (layout.intitle) {
1647                         if (runparams.have_maketitle) {
1648                                 if (!gave_layout_warning && !runparams.dryrun) {
1649                                         gave_layout_warning = true;
1650                                         frontend::Alert::warning(_("Error in latexParagraphs"),
1651                                                         bformat(_("You are using at least one "
1652                                                           "layout (%1$s) intended for the title, "
1653                                                           "after using non-title layouts. This "
1654                                                           "could lead to missing or incorrect output."
1655                                                           ), layout.name()));
1656                                 }
1657                         } else if (!runparams.need_maketitle) {
1658                                 runparams.need_maketitle = true;
1659                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1660                                         os << "\\begin{"
1661                                                         << from_ascii(tclass.titlename())
1662                                                         << "}\n";
1663                                 }
1664                         }
1665                 } else if (runparams.need_maketitle && !runparams.have_maketitle
1666                            && !layout.inpreamble && !text.inset().isInTitle()) {
1667                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
1668                                 os << "\\end{" << from_ascii(tclass.titlename())
1669                                                 << "}\n";
1670                         }
1671                         else {
1672                                 os << "\\" << from_ascii(tclass.titlename())
1673                                                 << "\n";
1674                         }
1675                         runparams.have_maketitle = true;
1676                         runparams.need_maketitle = false;
1677                 }
1678
1679                 if (layout.isCommand() && !layout.latexname().empty()
1680                     && layout.latexname() == bparams.multibib) {
1681                         if (runparams.openbtUnit)
1682                                 os << "\\end{btUnit}\n";
1683                         if (!bparams.useBiblatex()
1684                             && !buf.masterBibInfo().empty()) {
1685                                 os << '\n' << "\\begin{btUnit}\n";
1686                                 runparams.openbtUnit = true;
1687                         }
1688                 }
1689
1690                 if (!layout.isEnvironment() && par->params().leftIndent().zero()) {
1691                         // This is a standard top level paragraph, TeX it and continue.
1692                         TeXOnePar(buf, text, pit, os, runparams, everypar);
1693                         continue;
1694                 }
1695
1696                 // Do not output empty environments if the whole paragraph has
1697                 // been deleted with ct and changes are not output.
1698                 bool output_changes;
1699                 if (runparams.for_searchAdv == OutputParams::NoSearch)
1700                         output_changes = bparams.output_changes;
1701                 else
1702                         output_changes = (runparams.for_searchAdv == OutputParams::SearchWithDeleted);
1703                 bool const lastpar = size_t(pit + 1) >= paragraphs.size();
1704                 if (!lastpar) {
1705                         ParagraphList::const_iterator nextpar = paragraphs.iterator_at(pit + 1);
1706                         Paragraph const & cpar = paragraphs.at(pit);
1707                         if ((par->layout() != nextpar->layout()
1708                              || par->params().depth() == nextpar->params().depth()
1709                              || par->params().leftIndent() == nextpar->params().leftIndent())
1710                             && !cpar.empty()
1711                             && cpar.isDeleted(0, cpar.size()) && !output_changes) {
1712                                 if (!cpar.parEndChange().deleted())
1713                                         os << '\n' << '\n';
1714                                 continue;
1715                         }
1716                 } else {
1717                         // This is the last par
1718                         Paragraph const & cpar = paragraphs.at(pit);
1719                         if ( !cpar.empty()
1720                             && cpar.isDeleted(0, cpar.size()) && !output_changes) {
1721                                 if (!cpar.parEndChange().deleted())
1722                                         os << '\n' << '\n';
1723                                 continue;
1724                         }
1725                 }
1726
1727                 TeXEnvironmentData const data =
1728                         prepareEnvironment(buf, text, par, os, runparams);
1729                 // pit can be changed in TeXEnvironment.
1730                 TeXEnvironment(buf, text, runparams, pit, os);
1731                 finishEnvironment(os, runparams, data, maintext, lastpar);
1732         }
1733
1734         // FIXME: uncomment the content or remove this block
1735         if (pit == runparams.par_end) {
1736                         // Make sure that the last paragraph is
1737                         // correctly terminated (because TeXOnePar does
1738                         // not add a \n in this case)
1739                         //os << '\n';
1740         }
1741
1742         // It might be that we only have a title in this document.
1743         // But if we're in an inset, this is not the end of
1744         // the document. (There may be some other checks of this
1745         // kind that are needed.)
1746         if (runparams.need_maketitle && !runparams.have_maketitle && maintext) {
1747                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1748                         os << "\\end{" << from_ascii(tclass.titlename())
1749                            << "}\n";
1750                 } else {
1751                         os << "\\" << from_ascii(tclass.titlename())
1752                            << "\n";
1753                 }
1754         }
1755
1756         if (maintext && !is_child && runparams.openbtUnit)
1757                 os << "\\end{btUnit}\n";
1758
1759         // if "auto end" is switched off, explicitly close the language at the end
1760         // but only if the last par is in a babel or polyglossia language
1761         Language const * const lastpar_language =
1762                         paragraphs.at(lastpit).getParLanguage(bparams);
1763         if (maintext && !lyxrc.language_auto_end && !mainlang.empty() &&
1764                 lastpar_language->encoding()->package() != Encoding::CJK) {
1765                 os << from_utf8(subst(lang_end_command,
1766                                         "$$lang",
1767                                         mainlang))
1768                         << '\n';
1769                 // If we have language_auto_begin, the stack will
1770                 // already be empty, nothing to pop()
1771                 if (using_begin_end && !lyxrc.language_auto_begin)
1772                         popLanguageName();
1773         }
1774
1775         // If the last paragraph is an environment, we'll have to close
1776         // CJK at the very end to do proper nesting.
1777         if (maintext && !is_child && state->open_encoding_ == CJK) {
1778                 os << "\\clearpage\n\\end{CJK}\n";
1779                 state->open_encoding_ = none;
1780         }
1781         // Likewise for polyglossia or when using begin/end commands
1782         // or at the very end of an active branch inset with a language switch
1783         Language const * const outer_language = (runparams.local_font != nullptr)
1784                         ? runparams.local_font->language() : bparams.language;
1785         string const & prev_lang = runparams.use_polyglossia
1786                         ? getPolyglossiaEnvName(outer_language)
1787                         : outer_language->babel();
1788         string const lastpar_lang = runparams.use_polyglossia ?
1789                 getPolyglossiaEnvName(lastpar_language): lastpar_language->babel();
1790         string const & cur_lang = openLanguageName(state);
1791         if (((runparams.inbranch && langOpenedAtThisLevel(state) && prev_lang != cur_lang)
1792              || (maintext && !is_child)) && !cur_lang.empty()) {
1793                 os << from_utf8(subst(lang_end_command,
1794                                         "$$lang",
1795                                         cur_lang))
1796                    << '\n';
1797                 if (using_begin_end)
1798                         popLanguageName();
1799         } else if (runparams.inbranch && !using_begin_end
1800                    && prev_lang != lastpar_lang && !lastpar_lang.empty()) {
1801                 // with !using_begin_end, cur_lang is empty, so we need to
1802                 // compare against the paragraph language (and we are in the
1803                 // last paragraph at this point)
1804                 os << subst(lang_begin_command, "$$lang", prev_lang) << '\n';
1805         }
1806
1807         // reset inherited encoding
1808         if (state->cjk_inherited_ > 0) {
1809                 state->cjk_inherited_ -= 1;
1810                 if (state->cjk_inherited_ == 0)
1811                         state->open_encoding_ = CJK;
1812         }
1813
1814         if (multibib_child && mparams.useBibtopic()) {
1815                 os << "\\end{btUnit}\n";
1816                 runparams.openbtUnit = false;
1817         }
1818 }
1819
1820 // Switch the input encoding for some part(s) of the document.
1821 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
1822                    OutputParams const & runparams, Encoding const & newEnc,
1823                    bool force, bool noswitchmacro)
1824 {
1825         // Never switch encoding with XeTeX/LuaTeX
1826         // or if we're in a moving argument or inherit the outer encoding.
1827         if (runparams.isFullUnicode() || newEnc.name() == "inherit")
1828                 return make_pair(false, 0);
1829
1830         // Only switch for auto-selected legacy encodings (inputenc setting
1831         // "auto-legacy" or "auto-legacy-plain").
1832         // The "listings" environment can force a switch also with other
1833         // encoding settings (it does not support variable width encodings
1834         // (utf8, jis, ...) under 8-bit latex engines).
1835         if (!force && ((bparams.inputenc != "auto-legacy" && bparams.inputenc != "auto-legacy-plain")
1836                                    || runparams.moving_arg))
1837                 return make_pair(false, 0);
1838
1839         Encoding const & oldEnc = *runparams.encoding;
1840         // Do not switch, if the encoding is unchanged or switching is not supported.
1841         if (oldEnc.name() == newEnc.name()
1842                 || oldEnc.package() == Encoding::japanese
1843                 || oldEnc.package() == Encoding::none
1844                 || newEnc.package() == Encoding::none
1845                 || (runparams.for_searchAdv != OutputParams::NoSearch))
1846                 return make_pair(false, 0);
1847         // FIXME We ignore encoding switches from/to encodings that do
1848         // neither support the inputenc package nor the CJK package here.
1849         // This may fail for characters not supported by "unicodesymbols"
1850         // or for non-ASCII characters in "listings"
1851         // but it is the best we can do.
1852
1853         // change encoding
1854         LYXERR(Debug::LATEX, "Changing LaTeX encoding from "
1855                    << oldEnc.name() << " to " << newEnc.name());
1856         os << setEncoding(newEnc.iconvName());
1857         if (bparams.inputenc == "auto-legacy-plain")
1858           return make_pair(true, 0);
1859
1860         docstring const inputenc_arg(from_ascii(newEnc.latexName()));
1861         OutputState * state = getOutputState();
1862         switch (newEnc.package()) {
1863                 case Encoding::none:
1864                 case Encoding::japanese:
1865                         // shouldn't ever reach here (see above) but avoids warning.
1866                         return make_pair(true, 0);
1867                 case Encoding::inputenc: {
1868                         size_t count = inputenc_arg.length();
1869                         if (oldEnc.package() == Encoding::CJK &&
1870                             state->open_encoding_ == CJK) {
1871                                 os << "\\end{CJK}";
1872                                 state->open_encoding_ = none;
1873                                 count += 9;
1874                         }
1875                         else if (oldEnc.package() == Encoding::inputenc &&
1876                                  state->open_encoding_ == inputenc) {
1877                                 os << "\\egroup";
1878                                 state->open_encoding_ = none;
1879                                 count += 7;
1880                         }
1881                         if (runparams.local_font != nullptr
1882                             &&  oldEnc.package() == Encoding::CJK) {
1883                                 // within insets, \inputenc switches need
1884                                 // to be embraced within \bgroup...\egroup;
1885                                 // else CJK fails.
1886                                 os << "\\bgroup";
1887                                 count += 7;
1888                                 state->open_encoding_ = inputenc;
1889                         }
1890                         if (noswitchmacro)
1891                                 return make_pair(true, count);
1892                         os << "\\inputencoding{" << inputenc_arg << '}';
1893                         return make_pair(true, count + 16);
1894                 }
1895                 case Encoding::CJK: {
1896                         size_t count = inputenc_arg.length();
1897                         if (oldEnc.package() == Encoding::CJK &&
1898                             state->open_encoding_ == CJK) {
1899                                 os << "\\end{CJK}";
1900                                 count += 9;
1901                         }
1902                         if (oldEnc.package() == Encoding::inputenc &&
1903                             state->open_encoding_ == inputenc) {
1904                                 os << "\\egroup";
1905                                 count += 7;
1906                         }
1907                         os << "\\begin{CJK}{"
1908                            << from_ascii(newEnc.latexName()) << "}{"
1909                            << from_ascii(bparams.fonts_cjk) << "}";
1910                         state->open_encoding_ = CJK;
1911                         return make_pair(true, count + 15);
1912                 }
1913         }
1914         // Dead code to avoid a warning:
1915         return make_pair(true, 0);
1916 }
1917
1918 } // namespace lyx