src/output_latex.cpp

   1 /**
   2  * \file output_latex.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars Gullik Bjønnes
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "output_latex.h"
  14
  15 #include "Buffer.h"
  16 #include "BufferParams.h"
  17 #include "Encoding.h"
  18 #include "Font.h"
  19 #include "InsetList.h"
  20 #include "Language.h"
  21 #include "Layout.h"
  22 #include "LyXRC.h"
  23 #include "OutputParams.h"
  24 #include "Paragraph.h"
  25 #include "ParagraphParameters.h"
  26 #include "texstream.h"
  27 #include "TextClass.h"
  28
  29 #include "insets/InsetBibitem.h"
  30 #include "insets/InsetArgument.h"
  31
  32 #include "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/lyxalgo.h"
  39 #include "support/textutils.h"
  40 #include "support/gettext.h"
  41
  42 #include <QThreadStorage>
  43
  44 #include <list>
  45 #include <stack>
  46
  47 using namespace std;
  48 using namespace lyx::support;
  49
  50
  51 namespace lyx {
  52
  53 namespace {
  54
  55 enum OpenEncoding {
  56         none,
  57         inputenc,
  58         CJK
  59 };
  60
  61
  62 struct OutputState
  63 {
  64         OutputState() : open_encoding_(none), cjk_inherited_(0),
  65                         prev_env_language_(0), nest_level_(0)
  66         {
  67         }
  68         OpenEncoding open_encoding_;
  69         int cjk_inherited_;
  70         Language const * prev_env_language_;
  71         int nest_level_;
  72         stack<int> lang_switch_depth_;          // Both are always empty when
  73         stack<string> open_polyglossia_lang_;   // not using polyglossia
  74 };
  75
  76
  77 OutputState * getOutputState()
  78 {
  79         // FIXME An instance of OutputState should be kept around for each export
  80         //       instead of using local thread storage
  81         static QThreadStorage<OutputState *> outputstate;
  82         if (!outputstate.hasLocalData())
  83                 outputstate.setLocalData(new OutputState);
  84         return outputstate.localData();
  85 }
  86
  87
  88 string const & openLanguageName(OutputState const * state)
  89 {
  90         // Return a reference to the last active language opened with
  91         // polyglossia or when using begin/end commands. If none or when
  92         // using babel with only a begin command, return a reference to
  93         // an empty string.
  94
  95         static string const empty;
  96
  97         return state->open_polyglossia_lang_.empty()
  98                 ? empty
  99                 : state->open_polyglossia_lang_.top();
 100 }
 101
 102
 103 bool atSameLastLangSwitchDepth(OutputState const * state)
 104 {
 105         // Return true if the actual nest level is the same at which the
 106         // language was switched when using polyglossia or begin/end
 107         // commands. Instead, return always true when using babel with
 108         // only a begin command.
 109
 110         return state->lang_switch_depth_.size() == 0
 111                         ? true
 112                         : abs(state->lang_switch_depth_.top()) == state->nest_level_;
 113 }
 114
 115
 116 bool isLocalSwitch(OutputState const * state)
 117 {
 118         // Return true if the language was opened by a local command switch.
 119
 120         return state->lang_switch_depth_.size()
 121                 && state->lang_switch_depth_.top() < 0;
 122 }
 123
 124
 125 bool langOpenedAtThisLevel(OutputState const * state)
 126 {
 127         // Return true if the language was opened at the current nesting level.
 128
 129         return state->lang_switch_depth_.size()
 130                 && abs(state->lang_switch_depth_.top()) == state->nest_level_;
 131 }
 132
 133
 134 string const getPolyglossiaEnvName(Language const * lang)
 135 {
 136         string result = lang->polyglossia();
 137         if (result == "arabic")
 138                 // exceptional spelling; see polyglossia docs.
 139                 result = "Arabic";
 140         return result;
 141 }
 142
 143
 144 string const getPolyglossiaBegin(string const & lang_begin_command,
 145                                  string const & lang, string const & opts,
 146                                  bool const localswitch = false)
 147 {
 148         string result;
 149         if (!lang.empty()) {
 150                 // we need to revert the upcasing done in getPolyglossiaEnvName()
 151                 // in case we have a local polyglossia command (\textarabic).
 152                 string language = localswitch ? ascii_lowercase(lang) : lang;
 153                 result = subst(lang_begin_command, "$$lang", language);
 154         }
 155         string options = opts.empty() ?
 156                     string() : "[" + opts + "]";
 157         result = subst(result, "$$opts", options);
 158
 159         return result;
 160 }
 161
 162
 163 struct TeXEnvironmentData
 164 {
 165         bool cjk_nested;
 166         Layout const * style;
 167         Language const * par_language;
 168         Encoding const * prev_encoding;
 169         bool leftindent_open;
 170 };
 171
 172
 173 static TeXEnvironmentData prepareEnvironment(Buffer const & buf,
 174                                         Text const & text,
 175                                         ParagraphList::const_iterator pit,
 176                                         otexstream & os,
 177                                         OutputParams const & runparams)
 178 {
 179         TeXEnvironmentData data;
 180
 181         BufferParams const & bparams = buf.params();
 182
 183         // FIXME This test should not be necessary.
 184         // We should perhaps issue an error if it is.
 185         Layout const & style = text.inset().forcePlainLayout() ?
 186                 bparams.documentClass().plainLayout() : pit->layout();
 187
 188         ParagraphList const & paragraphs = text.paragraphs();
 189         ParagraphList::const_iterator const priorpit =
 190                 pit == paragraphs.begin() ? pit : prev(pit, 1);
 191
 192         OutputState * state = getOutputState();
 193         bool const use_prev_env_language = state->prev_env_language_ != 0
 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                 (pit != paragraphs.begin())
 204                 ? (use_prev_env_language ? state->prev_env_language_
 205                                          : priorpit->getParLanguage(bparams))
 206                 : doc_language;
 207
 208         bool const use_polyglossia = runparams.use_polyglossia;
 209         string const par_lang = use_polyglossia ?
 210                 getPolyglossiaEnvName(data.par_language) : data.par_language->babel();
 211         string const prev_par_lang = use_polyglossia ?
 212                 getPolyglossiaEnvName(prev_par_language) : prev_par_language->babel();
 213         string const doc_lang = use_polyglossia ?
 214                 getPolyglossiaEnvName(doc_language) : doc_language->babel();
 215         string const lang_begin_command = use_polyglossia ?
 216                 "\\begin{$$lang}" : lyxrc.language_command_begin;
 217         string const lang_end_command = use_polyglossia ?
 218                 "\\end{$$lang}" : lyxrc.language_command_end;
 219         bool const using_begin_end = use_polyglossia ||
 220                                         !lang_end_command.empty();
 221
 222         // For polyglossia, switch language outside of environment, if possible.
 223         if (par_lang != prev_par_lang) {
 224                 if ((!using_begin_end || langOpenedAtThisLevel(state)) &&
 225                     !lang_end_command.empty() &&
 226                     prev_par_lang != doc_lang &&
 227                     !prev_par_lang.empty()) {
 228                         os << from_ascii(subst(
 229                                 lang_end_command,
 230                                 "$$lang",
 231                                 prev_par_lang))
 232                           // the '%' is necessary to prevent unwanted whitespace
 233                           << "%\n";
 234                         if (using_begin_end)
 235                                 popLanguageName();
 236                 }
 237
 238                 // If no language was explicitly opened and we are using
 239                 // polyglossia or begin/end commands, then the current
 240                 // language is the document language.
 241                 string const & cur_lang = using_begin_end
 242                                           && state->lang_switch_depth_.size()
 243                                                   ? openLanguageName(state)
 244                                                   : doc_lang;
 245
 246                 if ((lang_end_command.empty() ||
 247                     par_lang != doc_lang ||
 248                     par_lang != cur_lang) &&
 249                     !par_lang.empty()) {
 250                             string bc = use_polyglossia ?
 251                                         getPolyglossiaBegin(lang_begin_command, par_lang,
 252                                                             data.par_language->polyglossiaOpts())
 253                                       : subst(lang_begin_command, "$$lang", par_lang);
 254                             os << bc;
 255                             // the '%' is necessary to prevent unwanted whitespace
 256                             os << "%\n";
 257                             if (using_begin_end)
 258                                     pushLanguageName(par_lang);
 259                 }
 260         }
 261
 262         data.leftindent_open = false;
 263         if (!pit->params().leftIndent().zero()) {
 264                 os << "\\begin{LyXParagraphLeftIndent}{"
 265                    << from_ascii(pit->params().leftIndent().asLatexString())
 266                    << "}\n";
 267                 data.leftindent_open = true;
 268         }
 269
 270         if (style.isEnvironment())
 271                 state->nest_level_ += 1;
 272
 273         if (style.isEnvironment() && !style.latexname().empty()) {
 274                 os << "\\begin{" << from_ascii(style.latexname()) << '}';
 275                 if (!style.latexargs().empty()) {
 276                         OutputParams rp = runparams;
 277                         rp.local_font = &pit->getFirstFontSettings(bparams);
 278                         latexArgInsets(paragraphs, pit, os, rp, style.latexargs());
 279                 }
 280                 if (style.latextype == LATEX_LIST_ENVIRONMENT) {
 281                         os << '{'
 282                            << pit->params().labelWidthString()
 283                            << "}\n";
 284                 } else if (style.labeltype == LABEL_BIBLIO) {
 285                         if (pit->params().labelWidthString().empty())
 286                                 os << '{' << bibitemWidest(buf, runparams) << "}\n";
 287                         else
 288                                 os << '{'
 289                                   << pit->params().labelWidthString()
 290                                   << "}\n";
 291                 } else
 292                         os << from_ascii(style.latexparam()) << '\n';
 293                 if (style.latextype == LATEX_BIB_ENVIRONMENT
 294                     || style.latextype == LATEX_ITEM_ENVIRONMENT
 295                     || style.latextype ==  LATEX_LIST_ENVIRONMENT) {
 296                         OutputParams rp = runparams;
 297                         rp.local_font = &pit->getFirstFontSettings(bparams);
 298                         latexArgInsets(paragraphs, pit, os, rp, style.listpreamble(),
 299                                        "listpreamble:");
 300                 }
 301         }
 302         data.style = &style;
 303
 304         // in multilingual environments, the CJK tags have to be nested properly
 305         data.cjk_nested = false;
 306         if (data.par_language->encoding()->package() == Encoding::CJK &&
 307             state->open_encoding_ != CJK && pit->isMultiLingual(bparams)) {
 308                 if (prev_par_language->encoding()->package() == Encoding::CJK)
 309                         os << "\\begin{CJK}{" << from_ascii(data.par_language->encoding()->latexName())
 310                            << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 311                 state->open_encoding_ = CJK;
 312                 data.cjk_nested = true;
 313         }
 314         return data;
 315 }
 316
 317
 318 static void finishEnvironment(otexstream & os, OutputParams const & runparams,
 319                               TeXEnvironmentData const & data)
 320 {
 321         OutputState * state = getOutputState();
 322         // BufferParams const & bparams = buf.params(); // FIXME: for speedup shortcut below, would require passing of "buf" as argument
 323         if (state->open_encoding_ == CJK && data.cjk_nested) {
 324                 // We need to close the encoding even if it does not change
 325                 // to do correct environment nesting
 326                 os << "\\end{CJK}\n";
 327                 state->open_encoding_ = none;
 328         }
 329
 330         if (data.style->isEnvironment()) {
 331                 os << breakln;
 332                 bool const using_begin_end =
 333                         runparams.use_polyglossia ||
 334                                 !lyxrc.language_command_end.empty();
 335                 // Close any language opened at this nest level
 336                 if (using_begin_end) {
 337                         while (langOpenedAtThisLevel(state)) {
 338                                 if (isLocalSwitch(state)) {
 339                                         os << "}";
 340                                 } else {
 341                                         os << "\\end{"
 342                                            << openLanguageName(state)
 343                                            << "}%\n";
 344                                 }
 345                                 popLanguageName();
 346                         }
 347                 }
 348                 state->nest_level_ -= 1;
 349                 string const & name = data.style->latexname();
 350                 if (!name.empty())
 351                         os << "\\end{" << from_ascii(name) << "}\n";
 352                 state->prev_env_language_ = data.par_language;
 353                 if (runparams.encoding != data.prev_encoding) {
 354                         runparams.encoding = data.prev_encoding;
 355                         os << setEncoding(data.prev_encoding->iconvName());
 356                 }
 357         }
 358
 359         if (data.leftindent_open) {
 360                 os << breakln << "\\end{LyXParagraphLeftIndent}\n";
 361                 state->prev_env_language_ = data.par_language;
 362                 if (runparams.encoding != data.prev_encoding) {
 363                         runparams.encoding = data.prev_encoding;
 364                         os << setEncoding(data.prev_encoding->iconvName());
 365                 }
 366         }
 367
 368         // Check whether we should output a blank line after the environment
 369         if (!data.style->nextnoindent)
 370                 os << '\n';
 371 }
 372
 373
 374 void TeXEnvironment(Buffer const & buf, Text const & text,
 375                     OutputParams const & runparams,
 376                     pit_type & pit, otexstream & os)
 377 {
 378         ParagraphList const & paragraphs = text.paragraphs();
 379         ParagraphList::const_iterator ipar = paragraphs.constIterator(pit);
 380         LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << pit);
 381
 382         Layout const & current_layout = ipar->layout();
 383         depth_type const current_depth = ipar->params().depth();
 384         Length const & current_left_indent = ipar->params().leftIndent();
 385
 386         // This is for debugging purpose at the end.
 387         pit_type const par_begin = pit;
 388         for (; pit < runparams.par_end; ++pit) {
 389                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 390
 391                 // check first if this is an higher depth paragraph.
 392                 bool go_out = (par->params().depth() < current_depth);
 393                 if (par->params().depth() == current_depth) {
 394                         // This environment is finished.
 395                         go_out |= (par->layout() != current_layout);
 396                         go_out |= (par->params().leftIndent() != current_left_indent);
 397                 }
 398                 if (go_out) {
 399                         // nothing to do here, restore pit and go out.
 400                         pit--;
 401                         break;
 402                 }
 403
 404                 if (par->layout() == current_layout
 405                         && par->params().depth() == current_depth
 406                         && par->params().leftIndent() == current_left_indent) {
 407                         // We are still in the same environment so TeXOnePar and continue;
 408                         TeXOnePar(buf, text, pit, os, runparams);
 409                         continue;
 410                 }
 411
 412                 // We are now in a deeper environment.
 413                 // Either par->layout() != current_layout
 414                 // Or     par->params().depth() > current_depth
 415                 // Or     par->params().leftIndent() != current_left_indent)
 416
 417                 // FIXME This test should not be necessary.
 418                 // We should perhaps issue an error if it is.
 419                 bool const force_plain_layout = text.inset().forcePlainLayout();
 420                 Layout const & style = force_plain_layout
 421                         ? buf.params().documentClass().plainLayout()
 422                         : par->layout();
 423
 424                 if (!style.isEnvironment()) {
 425                         // This is a standard paragraph, no need to call TeXEnvironment.
 426                         TeXOnePar(buf, text, pit, os, runparams);
 427                         continue;
 428                 }
 429
 430                 // This is a new environment.
 431                 TeXEnvironmentData const data =
 432                         prepareEnvironment(buf, text, par, os, runparams);
 433                 // Recursive call to TeXEnvironment!
 434                 TeXEnvironment(buf, text, runparams, pit, os);
 435                 finishEnvironment(os, runparams, data);
 436         }
 437
 438         if (pit != runparams.par_end)
 439                 LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << par_begin << " done.");
 440 }
 441
 442
 443 void getArgInsets(otexstream & os, OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs,
 444                   map<int, lyx::InsetArgument const *> ilist, vector<string> required, string const & prefix)
 445 {
 446         unsigned int const argnr = latexargs.size();
 447         if (argnr == 0)
 448                 return;
 449
 450         // Default and preset args are always output, so if they require
 451         // other arguments, consider this.
 452         for (auto const & larg : latexargs) {
 453                 Layout::latexarg const & arg = larg.second;
 454                 if ((!arg.presetarg.empty() || !arg.defaultarg.empty()) && !arg.requires.empty()) {
 455                                 vector<string> req = getVectorFromString(arg.requires);
 456                                 required.insert(required.end(), req.begin(), req.end());
 457                         }
 458         }
 459
 460         for (unsigned int i = 1; i <= argnr; ++i) {
 461                 map<int, InsetArgument const *>::const_iterator lit = ilist.find(i);
 462                 bool inserted = false;
 463                 if (lit != ilist.end()) {
 464                         InsetArgument const * ins = (*lit).second;
 465                         if (ins) {
 466                                 Layout::LaTeXArgMap::const_iterator const lait =
 467                                                 latexargs.find(ins->name());
 468                                 if (lait != latexargs.end()) {
 469                                         Layout::latexarg arg = (*lait).second;
 470                                         docstring ldelim;
 471                                         docstring rdelim;
 472                                         if (!arg.nodelims) {
 473                                                 ldelim = arg.mandatory ?
 474                                                         from_ascii("{") : from_ascii("[");
 475                                                 rdelim = arg.mandatory ?
 476                                                         from_ascii("}") : from_ascii("]");
 477                                         }
 478                                         if (!arg.ldelim.empty())
 479                                                 ldelim = arg.ldelim;
 480                                         if (!arg.rdelim.empty())
 481                                                 rdelim = arg.rdelim;
 482                                         ins->latexArgument(os, runparams, ldelim, rdelim, arg.presetarg);
 483                                         if (prefix == "listpreamble:")
 484                                                 os << breakln;
 485                                         inserted = true;
 486                                 }
 487                         }
 488                 }
 489                 if (!inserted) {
 490                         Layout::LaTeXArgMap::const_iterator lait = latexargs.begin();
 491                         Layout::LaTeXArgMap::const_iterator const laend = latexargs.end();
 492                         for (; lait != laend; ++lait) {
 493                                 string const name = prefix + convert<string>(i);
 494                                 if ((*lait).first == name) {
 495                                         Layout::latexarg arg = (*lait).second;
 496                                         docstring preset = arg.presetarg;
 497                                         if (!arg.defaultarg.empty()) {
 498                                                 if (!preset.empty())
 499                                                         preset += ",";
 500                                                 preset += arg.defaultarg;
 501                                         }
 502                                         if (arg.mandatory) {
 503                                                 docstring ldelim = arg.ldelim.empty() ?
 504                                                                 from_ascii("{") : arg.ldelim;
 505                                                 docstring rdelim = arg.rdelim.empty() ?
 506                                                                 from_ascii("}") : arg.rdelim;
 507                                                 os << ldelim << preset << rdelim;
 508                                         } else if (!preset.empty()) {
 509                                                 docstring ldelim = arg.ldelim.empty() ?
 510                                                                 from_ascii("[") : arg.ldelim;
 511                                                 docstring rdelim = arg.rdelim.empty() ?
 512                                                                 from_ascii("]") : arg.rdelim;
 513                                                 os << ldelim << preset << rdelim;
 514                                         } else if (find(required.begin(), required.end(),
 515                                                    (*lait).first) != required.end()) {
 516                                                 docstring ldelim = arg.ldelim.empty() ?
 517                                                                 from_ascii("[") : arg.ldelim;
 518                                                 docstring rdelim = arg.rdelim.empty() ?
 519                                                                 from_ascii("]") : arg.rdelim;
 520                                                 os << ldelim << rdelim;
 521                                         } else
 522                                                 break;
 523                                 }
 524                         }
 525                 }
 526         }
 527 }
 528
 529
 530 } // namespace
 531
 532
 533 void pushLanguageName(string const & lang_name, bool localswitch)
 534 {
 535         OutputState * state = getOutputState();
 536
 537         int nest_level = localswitch ? -state->nest_level_ : state->nest_level_;
 538         state->lang_switch_depth_.push(nest_level);
 539         state->open_polyglossia_lang_.push(lang_name);
 540 }
 541
 542
 543 void popLanguageName()
 544 {
 545         OutputState * state = getOutputState();
 546
 547         state->lang_switch_depth_.pop();
 548         state->open_polyglossia_lang_.pop();
 549 }
 550
 551
 552 string const & openLanguageName()
 553 {
 554         OutputState * state = getOutputState();
 555
 556         return openLanguageName(state);
 557 }
 558
 559
 560 namespace {
 561
 562 void addArgInsets(Paragraph const & par, string const & prefix,
 563                  Layout::LaTeXArgMap const & latexargs,
 564                  map<int, InsetArgument const *> & ilist,
 565                  vector<string> & required)
 566 {
 567         for (auto const & table : par.insetList()) {
 568                 InsetArgument const * arg = table.inset->asInsetArgument();
 569                 if (!arg)
 570                         continue;
 571                 if (arg->name().empty()) {
 572                         LYXERR0("Error: Unnamed argument inset!");
 573                         continue;
 574                 }
 575                 string const name = prefix.empty() ?
 576                         arg->name() : split(arg->name(), ':');
 577                 // why converting into an integer?
 578                 unsigned int const nr = convert<unsigned int>(name);
 579                 if (ilist.find(nr) == ilist.end())
 580                         ilist[nr] = arg;
 581                 Layout::LaTeXArgMap::const_iterator const lit =
 582                         latexargs.find(arg->name());
 583                 if (lit != latexargs.end()) {
 584                         Layout::latexarg const & larg = lit->second;
 585                         vector<string> req = getVectorFromString(larg.requires);
 586                         move(req.begin(), req.end(), back_inserter(required));
 587                 }
 588         }
 589 }
 590
 591 } // namespace
 592
 593
 594 void latexArgInsets(Paragraph const & par, otexstream & os,
 595                     OutputParams const & runparams,
 596                     Layout::LaTeXArgMap const & latexargs,
 597                     string const & prefix)
 598 {
 599         map<int, InsetArgument const *> ilist;
 600         vector<string> required;
 601         addArgInsets(par, prefix, latexargs, ilist, required);
 602         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 603 }
 604
 605
 606 void latexArgInsets(ParagraphList const & pars,
 607                     ParagraphList::const_iterator pit,
 608                     otexstream & os, OutputParams const & runparams,
 609                     Layout::LaTeXArgMap const & latexargs,
 610                     string const & prefix)
 611 {
 612         map<int, InsetArgument const *> ilist;
 613         vector<string> required;
 614
 615         depth_type const current_depth = pit->params().depth();
 616         Layout const current_layout = pit->layout();
 617
 618         // get the first paragraph in sequence with this layout and depth
 619         pit_type offset = 0;
 620         while (true) {
 621                 if (lyx::prev(pit, offset) == pars.begin())
 622                         break;
 623                 ParagraphList::const_iterator priorpit = lyx::prev(pit, offset + 1);
 624                 if (priorpit->layout() == current_layout
 625                     && priorpit->params().depth() == current_depth)
 626                         ++offset;
 627                 else
 628                         break;
 629         }
 630
 631         ParagraphList::const_iterator spit = lyx::prev(pit, offset);
 632
 633         for (; spit != pars.end(); ++spit) {
 634                 if (spit->layout() != current_layout ||
 635                     spit->params().depth() < current_depth)
 636                         break;
 637                 if (spit->params().depth() > current_depth)
 638                         continue;
 639                 addArgInsets(*spit, prefix, latexargs, ilist, required);
 640         }
 641         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 642 }
 643
 644
 645 void latexArgInsetsForParent(ParagraphList const & pars, otexstream & os,
 646                              OutputParams const & runparams,
 647                              Layout::LaTeXArgMap const & latexargs,
 648                              string const & prefix)
 649 {
 650         map<int, InsetArgument const *> ilist;
 651         vector<string> required;
 652
 653         for (Paragraph const & par : pars) {
 654                 if (par.layout().hasArgs())
 655                         // The InsetArguments inside this paragraph refer to this paragraph
 656                         continue;
 657                 addArgInsets(par, prefix, latexargs, ilist, required);
 658         }
 659         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 660 }
 661
 662
 663 namespace {
 664
 665 // output the proper paragraph start according to latextype.
 666 void parStartCommand(Paragraph const & par, otexstream & os,
 667                      OutputParams const & runparams, Layout const & style)
 668 {
 669         switch (style.latextype) {
 670         case LATEX_COMMAND:
 671                 if (par.needsCProtection(runparams.moving_arg))
 672                         os << "\\cprotect";
 673                 os << '\\' << from_ascii(style.latexname());
 674
 675                 // Command arguments
 676                 if (!style.latexargs().empty())
 677                         latexArgInsets(par, os, runparams, style.latexargs());
 678                 os << from_ascii(style.latexparam());
 679                 break;
 680         case LATEX_ITEM_ENVIRONMENT:
 681         case LATEX_LIST_ENVIRONMENT:
 682                 if (runparams.for_search) {
 683                         os << "\\" + style.itemcommand() << "{" << style.latexname() << "}";
 684                 }
 685                 else {
 686                         os << "\\" + style.itemcommand();
 687                         // Item arguments
 688                         if (!style.itemargs().empty())
 689                                 latexArgInsets(par, os, runparams, style.itemargs(), "item:");
 690                         os << " ";
 691                 }
 692                 break;
 693         case LATEX_BIB_ENVIRONMENT:
 694                 // ignore this, the inset will write itself
 695                 break;
 696         default:
 697                 break;
 698         }
 699 }
 700
 701 } // namespace
 702
 703 // FIXME: this should be anonymous
 704 void TeXOnePar(Buffer const & buf,
 705                Text const & text,
 706                pit_type pit,
 707                otexstream & os,
 708                OutputParams const & runparams_in,
 709                string const & everypar,
 710                int start_pos, int end_pos,
 711                bool const force)
 712 {
 713         BufferParams const & bparams = runparams_in.is_child
 714                 ? buf.masterParams() : buf.params();
 715         ParagraphList const & paragraphs = text.paragraphs();
 716         Paragraph const & par = paragraphs.at(pit);
 717         // FIXME This check should not really be needed.
 718         // Perhaps we should issue an error if it is.
 719         Layout const & style = text.inset().forcePlainLayout() ?
 720                 bparams.documentClass().plainLayout() : par.layout();
 721
 722         if (style.inpreamble && !force)
 723                 return;
 724
 725         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " ptr " << &par << " '"
 726                 << everypar << "'");
 727
 728         OutputParams runparams = runparams_in;
 729         runparams.isLastPar = (pit == pit_type(paragraphs.size() - 1));
 730         // We reinitialze par begin and end to be on the safe side
 731         // with embedded inset as we don't know if they set those
 732         // value correctly.
 733         runparams.par_begin = 0;
 734         runparams.par_end = 0;
 735
 736         bool const maintext = text.isMainText();
 737         // we are at the beginning of an inset and CJK is already open;
 738         // we count inheritation levels to get the inset nesting right.
 739         OutputState * state = getOutputState();
 740         if (pit == 0 && !maintext
 741             && (state->cjk_inherited_ > 0 || state->open_encoding_ == CJK)) {
 742                 state->cjk_inherited_ += 1;
 743                 state->open_encoding_ = none;
 744         }
 745
 746         if (text.inset().isPassThru()) {
 747                 Font const outerfont = text.outerFont(pit);
 748
 749                 // No newline before first paragraph in this lyxtext
 750                 if (pit > 0) {
 751                         os << '\n';
 752                         if (!text.inset().getLayout().parbreakIsNewline())
 753                                 os << '\n';
 754                 }
 755
 756                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos, force);
 757                 return;
 758         }
 759
 760         Paragraph const * nextpar = runparams.isLastPar
 761                 ? 0 : &paragraphs.at(pit + 1);
 762
 763         bool const intitle_command = style.intitle && style.latextype == LATEX_COMMAND;
 764
 765         if (style.pass_thru) {
 766                 Font const outerfont = text.outerFont(pit);
 767                 parStartCommand(par, os, runparams, style);
 768                 if (intitle_command)
 769                         os << '{';
 770
 771                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos, force);
 772
 773                 // I did not create a parEndCommand for this minuscule
 774                 // task because in the other user of parStartCommand
 775                 // the code is different (JMarc)
 776                 if (style.isCommand())
 777                         os << "}\n";
 778                 else
 779                         os << '\n';
 780                 if (!style.parbreak_is_newline) {
 781                         os << '\n';
 782                 } else if (nextpar && !style.isEnvironment()) {
 783                         Layout const nextstyle = text.inset().forcePlainLayout()
 784                                 ? bparams.documentClass().plainLayout()
 785                                 : nextpar->layout();
 786                         if (nextstyle.name() != style.name())
 787                                 os << '\n';
 788                 }
 789
 790                 return;
 791         }
 792
 793         // This paragraph's language
 794         Language const * const par_language = par.getParLanguage(bparams);
 795         Language const * const nextpar_language = nextpar ?
 796                 nextpar->getParLanguage(bparams) : 0;
 797         // The document's language
 798         Language const * const doc_language = bparams.language;
 799         // The language that was in effect when the environment this paragraph is
 800         // inside of was opened
 801         Language const * const outer_language =
 802                 (runparams.local_font != 0) ?
 803                         runparams.local_font->language() : doc_language;
 804
 805         Paragraph const * priorpar = (pit == 0) ? 0 : &paragraphs.at(pit - 1);
 806
 807         // The previous language that was in effect is the language of the
 808         // previous paragraph, unless the previous paragraph is inside an
 809         // environment with nesting depth greater than (or equal to, but with
 810         // a different layout) the current one. If there is no previous
 811         // paragraph, the previous language is the outer language.
 812         // Note further that we take the outer language also if the prior par
 813         // is PassThru, since in that case it has latex_language, and all secondary
 814         // languages have been closed (#10793).
 815         bool const use_prev_env_language = state->prev_env_language_ != 0
 816                         && priorpar
 817                         && priorpar->layout().isEnvironment()
 818                         && (priorpar->getDepth() > par.getDepth()
 819                             || (priorpar->getDepth() == par.getDepth()
 820                                     && priorpar->layout() != par.layout()));
 821         Language const * const prev_language =
 822                 runparams_in.for_search ?
 823                         languages.getLanguage("ignore")
 824                 :(priorpar && !priorpar->isPassThru())
 825                         ? (use_prev_env_language ? state->prev_env_language_
 826                                                 : priorpar->getParLanguage(bparams))
 827                         : outer_language;
 828
 829         bool const use_polyglossia = runparams.use_polyglossia;
 830         string const par_lang = use_polyglossia ?
 831                 getPolyglossiaEnvName(par_language): par_language->babel();
 832         string const prev_lang = use_polyglossia ?
 833                 getPolyglossiaEnvName(prev_language) : prev_language->babel();
 834         string const outer_lang = use_polyglossia ?
 835                 getPolyglossiaEnvName(outer_language) : outer_language->babel();
 836         string const nextpar_lang = nextpar_language ? (use_polyglossia ?
 837                 getPolyglossiaEnvName(nextpar_language) :
 838                 nextpar_language->babel()) : string();
 839         string lang_begin_command = use_polyglossia ?
 840                 "\\begin{$$lang}$$opts" : lyxrc.language_command_begin;
 841         string lang_end_command = use_polyglossia ?
 842                 "\\end{$$lang}" : lyxrc.language_command_end;
 843         // the '%' is necessary to prevent unwanted whitespace
 844         string lang_command_termination = "%\n";
 845         bool const using_begin_end = use_polyglossia ||
 846                                         !lang_end_command.empty();
 847
 848         // For InTitle commands, we need to switch the language inside the command
 849         // (see #10849); thus open the command here.
 850         if (intitle_command) {
 851                 parStartCommand(par, os, runparams, style);
 852                 os << '{';
 853         }
 854
 855         // In some insets (such as Arguments), we cannot use \selectlanguage.
 856         // Also, if an RTL language is set via environment in polyglossia,
 857         // only a nested \\text<lang> command will reset the direction for LTR
 858         // languages (see # 10111).
 859         bool const in_polyglossia_rtl_env =
 860                 use_polyglossia
 861                 && runparams.local_font != 0
 862                 && outer_language->rightToLeft()
 863                 && !par_language->rightToLeft();
 864         bool const localswitch = runparams_in.for_search
 865                         || text.inset().forceLocalFontSwitch()
 866                         || (using_begin_end && text.inset().forcePlainLayout())
 867                         || in_polyglossia_rtl_env;
 868         if (localswitch) {
 869                 lang_begin_command = use_polyglossia ?
 870                             "\\text$$lang$$opts{" : lyxrc.language_command_local;
 871                 lang_end_command = "}";
 872                 lang_command_termination.clear();
 873         }
 874
 875         bool const localswitch_needed = localswitch && par_lang != outer_lang;
 876
 877         // localswitches need to be closed and reopened at each par
 878         if (runparams_in.for_search || ((par_lang != prev_lang || localswitch_needed)
 879              // check if we already put language command in TeXEnvironment()
 880              && !(style.isEnvironment()
 881                   && (pit == 0 || (priorpar->layout() != par.layout()
 882                                    && priorpar->getDepth() <= par.getDepth())
 883                       || priorpar->getDepth() < par.getDepth())))) {
 884                 if (!localswitch
 885                     && (!using_begin_end || langOpenedAtThisLevel(state))
 886                     && !lang_end_command.empty()
 887                     && prev_lang != outer_lang
 888                     && !prev_lang.empty()
 889                     && (!using_begin_end || !style.isEnvironment())) {
 890                         os << from_ascii(subst(lang_end_command,
 891                                                "$$lang",
 892                                                prev_lang))
 893                            << lang_command_termination;
 894                         if (using_begin_end)
 895                                 popLanguageName();
 896                 }
 897
 898                 // We need to open a new language if we couldn't close the previous
 899                 // one (because there's no language_command_end); and even if we closed
 900                 // the previous one, if the current language is different than the
 901                 // outer_language (which is currently in effect once the previous one
 902                 // is closed).
 903                 if ((lang_end_command.empty() || par_lang != outer_lang
 904                      || (!using_begin_end
 905                          || (style.isEnvironment() && par_lang != prev_lang)))
 906                         && !par_lang.empty()) {
 907                         // If we're inside an inset, and that inset is within an \L or \R
 908                         // (or equivalents), then within the inset, too, any opposite
 909                         // language paragraph should appear within an \L or \R (in addition
 910                         // to, outside of, the normal language switch commands).
 911                         // This behavior is not correct for ArabTeX, though.
 912                         if (!using_begin_end
 913                             // not for ArabTeX
 914                             && par_language->lang() != "arabic_arabtex"
 915                             && outer_language->lang() != "arabic_arabtex"
 916                             // are we in an inset?
 917                             && runparams.local_font != 0
 918                             // is the inset within an \L or \R?
 919                             //
 920                             // FIXME: currently, we don't check this; this means that
 921                             // we'll have unnnecessary \L and \R commands, but that
 922                             // doesn't seem to hurt (though latex will complain)
 923                             //
 924                             // is this paragraph in the opposite direction?
 925                             && runparams.local_font->isRightToLeft() != par_language->rightToLeft()) {
 926                                 // FIXME: I don't have a working copy of the Arabi package, so
 927                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 928                                 // or not...
 929                                 if (par_language->lang() == "farsi")
 930                                         os << "\\textFR{";
 931                                 else if (outer_language->lang() == "farsi")
 932                                         os << "\\textLR{";
 933                                 else if (par_language->lang() == "arabic_arabi")
 934                                         os << "\\textAR{";
 935                                 else if (outer_language->lang() == "arabic_arabi")
 936                                         os << "\\textLR{";
 937                                 // remaining RTL languages currently is hebrew
 938                                 else if (par_language->rightToLeft())
 939                                         os << "\\R{";
 940                                 else
 941                                         os << "\\L{";
 942                         }
 943                         // With CJK, the CJK tag has to be closed first (see below)
 944                         if ((runparams.encoding->package() != Encoding::CJK || runparams.for_search)
 945                             && (par_lang != openLanguageName(state) || localswitch)
 946                             && !par_lang.empty()) {
 947                                 string bc = use_polyglossia ?
 948                                           getPolyglossiaBegin(lang_begin_command, par_lang,
 949                                                               par_language->polyglossiaOpts(),
 950                                                               localswitch)
 951                                           : subst(lang_begin_command, "$$lang", par_lang);
 952                                 os << bc;
 953                                 os << lang_command_termination;
 954                                 if (using_begin_end)
 955                                         pushLanguageName(par_lang, localswitch);
 956                         }
 957                 }
 958         }
 959
 960         // Switch file encoding if necessary; no need to do this for "default"
 961         // encoding, since this only affects the position of the outputted
 962         // \inputencoding command; the encoding switch will occur when necessary
 963         if (bparams.inputenc == "auto"
 964                 && !runparams.isFullUnicode() // Xe/LuaTeX use one document-wide encoding  (see also switchEncoding())
 965                 && runparams.encoding->package() != Encoding::none) {
 966                 // Look ahead for future encoding changes.
 967                 // We try to output them at the beginning of the paragraph,
 968                 // since the \inputencoding command is not allowed e.g. in
 969                 // sections. For this reason we only set runparams.moving_arg
 970                 // after checking for the encoding change, otherwise the
 971                 // change would be always avoided by switchEncoding().
 972                 for (pos_type i = 0; i < par.size(); ++i) {
 973                         char_type const c = par.getChar(i);
 974                         Encoding const * const encoding =
 975                                 par.getFontSettings(bparams, i).language()->encoding();
 976                         if (encoding->package() != Encoding::CJK
 977                                 && runparams.encoding->package() == Encoding::inputenc
 978                                 && isASCII(c))
 979                                 continue;
 980                         if (par.isInset(i))
 981                                 break;
 982                         // All characters before c are in the ASCII range, and
 983                         // c is non-ASCII (but no inset), so change the
 984                         // encoding to that required by the language of c.
 985                         // With CJK, only add switch if we have CJK content at the beginning
 986                         // of the paragraph
 987                         if (i != 0 && encoding->package() == Encoding::CJK)
 988                                 continue;
 989
 990                         pair<bool, int> enc_switch = switchEncoding(os.os(),
 991                                                 bparams, runparams, *encoding);
 992                         // the following is necessary after a CJK environment in a multilingual
 993                         // context (nesting issue).
 994                         if (par_language->encoding()->package() == Encoding::CJK
 995                                 && state->open_encoding_ != CJK && state->cjk_inherited_ == 0) {
 996                                 os << "\\begin{CJK}{" << from_ascii(par_language->encoding()->latexName())
 997                                    << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 998                                 state->open_encoding_ = CJK;
 999                         }
1000                         if (encoding->package() != Encoding::none && enc_switch.first) {
1001                                 if (enc_switch.second > 0) {
1002                                         // the '%' is necessary to prevent unwanted whitespace
1003                                         os << "%\n";
1004                                 }
1005                                 // With CJK, the CJK tag had to be closed first (see above)
1006                                 if (runparams.encoding->package() == Encoding::CJK
1007                                     && par_lang != openLanguageName(state)
1008                                     && !par_lang.empty()) {
1009                                         string bc = use_polyglossia ?
1010                                                     getPolyglossiaBegin(lang_begin_command, par_lang,
1011                                                                         par_language->polyglossiaOpts(),
1012                                                                         localswitch)
1013                                                     : subst(lang_begin_command, "$$lang", par_lang);
1014                                         os << bc
1015                                            << lang_command_termination;
1016                                         if (using_begin_end)
1017                                                 pushLanguageName(par_lang, localswitch);
1018                                 }
1019                                 runparams.encoding = encoding;
1020                         }
1021                         break;
1022                 }
1023         }
1024
1025         runparams.moving_arg |= style.needprotect;
1026         Encoding const * const prev_encoding = runparams.encoding;
1027
1028         bool const useSetSpace = bparams.documentClass().provides("SetSpace");
1029         if (par.allowParagraphCustomization()) {
1030                 if (par.params().startOfAppendix()) {
1031                         os << "\n\\appendix\n";
1032                 }
1033
1034                 // InTitle commands must use switches (not environments)
1035                 // inside the commands (see #9332)
1036                 if (style.intitle) {
1037                         if (!par.params().spacing().isDefault())
1038                         {
1039                                 if (runparams.moving_arg)
1040                                         os << "\\protect";
1041                                 os << from_ascii(par.params().spacing().writeCmd(useSetSpace));
1042                         }
1043                 } else {
1044                         if (!par.params().spacing().isDefault()
1045                                 && (pit == 0 || !priorpar->hasSameLayout(par)))
1046                         {
1047                                 os << from_ascii(par.params().spacing().writeEnvirBegin(useSetSpace))
1048                                     << '\n';
1049                         }
1050
1051                         if (style.isCommand()) {
1052                                 os << '\n';
1053                         }
1054                 }
1055         }
1056
1057         // For InTitle commands, we already started the command before
1058         // the language switch
1059         if (!intitle_command)
1060                 parStartCommand(par, os, runparams, style);
1061
1062         Font const outerfont = text.outerFont(pit);
1063
1064         // FIXME UNICODE
1065         os << from_utf8(everypar);
1066         par.latex(bparams, outerfont, os, runparams, start_pos, end_pos, force);
1067
1068         Font const font = par.empty()
1069                  ? par.getLayoutFont(bparams, outerfont)
1070                  : par.getFont(bparams, par.size() - 1, outerfont);
1071
1072         bool const is_command = style.isCommand();
1073
1074         // InTitle commands need to be closed after the language has been closed.
1075         if (!intitle_command) {
1076                 if (is_command) {
1077                         os << '}';
1078                         if (!style.postcommandargs().empty())
1079                                 latexArgInsets(par, os, runparams, style.postcommandargs(), "post:");
1080                         if (runparams.encoding != prev_encoding) {
1081                                 runparams.encoding = prev_encoding;
1082                                 os << setEncoding(prev_encoding->iconvName());
1083                         }
1084                 }
1085         }
1086
1087         bool pending_newline = false;
1088         bool unskip_newline = false;
1089         bool close_lang_switch = false;
1090         switch (style.latextype) {
1091         case LATEX_ITEM_ENVIRONMENT:
1092         case LATEX_LIST_ENVIRONMENT:
1093                 if ((nextpar && par_lang != nextpar_lang
1094                              && nextpar->getDepth() == par.getDepth())
1095                     || (atSameLastLangSwitchDepth(state) && nextpar
1096                             && nextpar->getDepth() < par.getDepth()))
1097                         close_lang_switch = using_begin_end;
1098                 if (nextpar && par.params().depth() < nextpar->params().depth())
1099                         pending_newline = true;
1100                 break;
1101         case LATEX_ENVIRONMENT: {
1102                 // if its the last paragraph of the current environment
1103                 // skip it otherwise fall through
1104                 if (nextpar
1105                     && ((nextpar->layout() != par.layout()
1106                            || nextpar->params().depth() != par.params().depth())
1107                         || (!using_begin_end || par_lang != nextpar_lang)))
1108                 {
1109                         close_lang_switch = using_begin_end;
1110                         break;
1111                 }
1112         }
1113         // possible
1114         // fall through
1115         default:
1116                 // we don't need it for the last paragraph and in InTitle commands!!!
1117                 if (nextpar && !intitle_command)
1118                         pending_newline = true;
1119         }
1120
1121         // InTitle commands use switches (not environments) for space settings
1122         if (par.allowParagraphCustomization() && !style.intitle) {
1123                 if (!par.params().spacing().isDefault()
1124                         && (runparams.isLastPar || !nextpar->hasSameLayout(par))) {
1125                         if (pending_newline)
1126                                 os << '\n';
1127
1128                         string const endtag =
1129                                 par.params().spacing().writeEnvirEnd(useSetSpace);
1130                         if (prefixIs(endtag, "\\end{"))
1131                                 os << breakln;
1132
1133                         os << from_ascii(endtag);
1134                         pending_newline = true;
1135                 }
1136         }
1137
1138         // Closing the language is needed for the last paragraph in a given language
1139         // as well as for any InTitleCommand (since these set the language locally);
1140         // it is also needed if we're within an \L or \R that we may have opened above
1141         // (not necessarily in this paragraph) and are about to close.
1142         bool closing_rtl_ltr_environment = !using_begin_end
1143                 // not for ArabTeX
1144                 && (par_language->lang() != "arabic_arabtex"
1145                     && outer_language->lang() != "arabic_arabtex")
1146                 // have we opened an \L or \R environment?
1147                 && runparams.local_font != 0
1148                 && runparams.local_font->isRightToLeft() != par_language->rightToLeft()
1149                 // are we about to close the language?
1150                 &&((nextpar && par_lang != nextpar_lang)
1151                    || (runparams.isLastPar && par_lang != outer_lang));
1152
1153         if (localswitch_needed
1154             || (intitle_command && using_begin_end)
1155             || closing_rtl_ltr_environment
1156             || ((runparams.isLastPar || close_lang_switch)
1157                 && (par_lang != outer_lang || (using_begin_end
1158                                                 && style.isEnvironment()
1159                                                 && par_lang != nextpar_lang)))) {
1160                 // Since \selectlanguage write the language to the aux file,
1161                 // we need to reset the language at the end of footnote or
1162                 // float.
1163
1164                 if (!localswitch && (pending_newline || close_lang_switch))
1165                         os << '\n';
1166
1167                 // when the paragraph uses CJK, the language has to be closed earlier
1168                 if ((font.language()->encoding()->package() != Encoding::CJK) || runparams_in.for_search) {
1169                         if (lang_end_command.empty()) {
1170                                 // If this is a child, we should restore the
1171                                 // master language after the last paragraph.
1172                                 Language const * const current_language =
1173                                         (runparams.isLastPar && runparams.master_language)
1174                                                 ? runparams.master_language
1175                                                 : outer_language;
1176                                 string const current_lang = use_polyglossia
1177                                         ? getPolyglossiaEnvName(current_language)
1178                                         : current_language->babel();
1179                                 if (!current_lang.empty()
1180                                     && current_lang != openLanguageName(state)) {
1181                                         string bc = use_polyglossia ?
1182                                                     getPolyglossiaBegin(lang_begin_command, current_lang,
1183                                                                         current_language->polyglossiaOpts(),
1184                                                                         localswitch)
1185                                                   : subst(lang_begin_command, "$$lang", current_lang);
1186                                         os << bc;
1187                                         pending_newline = !localswitch;
1188                                         unskip_newline = !localswitch;
1189                                         if (using_begin_end)
1190                                                 pushLanguageName(current_lang, localswitch);
1191                                 }
1192                         } else if ((!using_begin_end ||
1193                                     langOpenedAtThisLevel(state)) &&
1194                                    !par_lang.empty()) {
1195                                 // If we are in an environment, we have to
1196                                 // close the "outer" language afterwards
1197                                 string const & cur_lang = openLanguageName(state);
1198                                 if (!style.isEnvironment()
1199                                     || (close_lang_switch
1200                                         && atSameLastLangSwitchDepth(state)
1201                                         && par_lang != outer_lang
1202                                         && (par_lang != cur_lang
1203                                             || (cur_lang != outer_lang
1204                                                 && nextpar
1205                                                 && style != nextpar->layout())))
1206                                     || (atSameLastLangSwitchDepth(state)
1207                                         && state->lang_switch_depth_.size()
1208                                         && cur_lang != par_lang)
1209                                     || in_polyglossia_rtl_env)
1210                                 {
1211                                         if (using_begin_end && !localswitch)
1212                                                 os << breakln;
1213                                         os << from_ascii(subst(
1214                                                 lang_end_command,
1215                                                 "$$lang",
1216                                                 par_lang));
1217                                         pending_newline = !localswitch;
1218                                         unskip_newline = !localswitch;
1219                                         if (using_begin_end)
1220                                                 popLanguageName();
1221                                 }
1222                         }
1223                 }
1224         }
1225         if (closing_rtl_ltr_environment)
1226                 os << "}";
1227
1228         // InTitle commands need to be closed after the language has been closed.
1229         if (intitle_command) {
1230                 if (is_command) {
1231                         os << '}';
1232                         if (!style.postcommandargs().empty())
1233                                 latexArgInsets(par, os, runparams, style.postcommandargs(), "post:");
1234                         if (runparams.encoding != prev_encoding) {
1235                                 runparams.encoding = prev_encoding;
1236                                 os << setEncoding(prev_encoding->iconvName());
1237                         }
1238                 }
1239         }
1240
1241         bool const last_was_separator =
1242                 par.size() > 0 && par.isEnvSeparator(par.size() - 1);
1243
1244         if (pending_newline) {
1245                 if (unskip_newline)
1246                         // prevent unwanted whitespace
1247                         os << '%';
1248                 if (!os.afterParbreak() && !last_was_separator)
1249                         os << '\n';
1250         }
1251
1252         // if this is a CJK-paragraph and the next isn't, close CJK
1253         // also if the next paragraph is a multilingual environment (because of nesting)
1254         if (nextpar
1255                 && state->open_encoding_ == CJK
1256                 && (nextpar_language->encoding()->package() != Encoding::CJK
1257                    || (nextpar->layout().isEnvironment() && nextpar->isMultiLingual(bparams)))
1258                 // inbetween environments, CJK has to be closed later (nesting!)
1259                 && (!style.isEnvironment() || !nextpar->layout().isEnvironment())) {
1260                 os << "\\end{CJK}\n";
1261                 state->open_encoding_ = none;
1262         }
1263
1264         // If this is the last paragraph, close the CJK environment
1265         // if necessary. If it's an environment, we'll have to \end that first.
1266         if (runparams.isLastPar && !style.isEnvironment()) {
1267                 switch (state->open_encoding_) {
1268                         case CJK: {
1269                                 // do nothing at the end of child documents
1270                                 if (maintext && buf.masterBuffer() != &buf)
1271                                         break;
1272                                 // end of main text
1273                                 if (maintext) {
1274                                         os << "\n\\end{CJK}\n";
1275                                 // end of an inset
1276                                 } else
1277                                         os << "\\end{CJK}";
1278                                 state->open_encoding_ = none;
1279                                 break;
1280                         }
1281                         case inputenc: {
1282                                 os << "\\egroup";
1283                                 state->open_encoding_ = none;
1284                                 break;
1285                         }
1286                         case none:
1287                         default:
1288                                 // do nothing
1289                                 break;
1290                 }
1291         }
1292
1293         // If this is the last paragraph, and a local_font was set upon entering
1294         // the inset, and we're using "auto" or "default" encoding, and not
1295         // compiling with XeTeX or LuaTeX, the encoding
1296         // should be set back to that local_font's encoding.
1297         if (runparams.isLastPar && runparams_in.local_font != 0
1298             && runparams_in.encoding != runparams_in.local_font->language()->encoding()
1299             && (bparams.inputenc == "auto" || bparams.inputenc == "default")
1300                 && !runparams.isFullUnicode()
1301            ) {
1302                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
1303                 os << setEncoding(runparams_in.encoding->iconvName());
1304         }
1305         // Otherwise, the current encoding should be set for the next paragraph.
1306         else
1307                 runparams_in.encoding = runparams.encoding;
1308
1309
1310         // we don't need a newline for the last paragraph!!!
1311         // Note from JMarc: we will re-add a \n explicitly in
1312         // TeXEnvironment, because it is needed in this case
1313         if (nextpar && !os.afterParbreak() && !last_was_separator) {
1314                 // Make sure to start a new line
1315                 os << breakln;
1316                 Layout const & next_layout = nextpar->layout();
1317                 // A newline '\n' is always output before a command,
1318                 // so avoid doubling it.
1319                 if (!next_layout.isCommand()) {
1320                         // Here we now try to avoid spurious empty lines by
1321                         // outputting a paragraph break only if: (case 1) the
1322                         // paragraph style allows parbreaks and no \begin, \end
1323                         // or \item tags are going to follow (i.e., if the next
1324                         // isn't the first or the current isn't the last
1325                         // paragraph of an environment or itemize) and the
1326                         // depth and alignment of the following paragraph is
1327                         // unchanged, or (case 2) the following is a
1328                         // non-environment paragraph whose depth is increased
1329                         // but whose alignment is unchanged, or (case 3) the
1330                         // paragraph is not an environment and the next one is a
1331                         // non-itemize-like env at lower depth, or (case 4) the
1332                         // paragraph is a command not followed by an environment
1333                         // and the alignment of the current and next paragraph
1334                         // is unchanged, or (case 5) the current alignment is
1335                         // changed and a standard paragraph follows.
1336                         DocumentClass const & tclass = bparams.documentClass();
1337                         if ((style == next_layout
1338                              && !style.parbreak_is_newline
1339                              && !text.inset().getLayout().parbreakIsNewline()
1340                              && style.latextype != LATEX_ITEM_ENVIRONMENT
1341                              && style.latextype != LATEX_LIST_ENVIRONMENT
1342                              && style.align == par.getAlign()
1343                              && nextpar->getDepth() == par.getDepth()
1344                              && nextpar->getAlign() == par.getAlign())
1345                             || (!next_layout.isEnvironment()
1346                                 && nextpar->getDepth() > par.getDepth()
1347                                 && nextpar->getAlign() == par.getAlign())
1348                             || (!style.isEnvironment()
1349                                 && next_layout.latextype == LATEX_ENVIRONMENT
1350                                 && nextpar->getDepth() < par.getDepth())
1351                             || (style.isCommand()
1352                                 && !next_layout.isEnvironment()
1353                                 && style.align == par.getAlign()
1354                                 && next_layout.align == nextpar->getAlign())
1355                             || (style.align != par.getAlign()
1356                                 && tclass.isDefaultLayout(next_layout))) {
1357                                 os << '\n';
1358                         }
1359                 }
1360         }
1361
1362         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " done; ptr "
1363                 << &par << " next " << nextpar);
1364
1365         return;
1366 }
1367
1368
1369 // LaTeX all paragraphs
1370 void latexParagraphs(Buffer const & buf,
1371                      Text const & text,
1372                      otexstream & os,
1373                      OutputParams const & runparams,
1374                      string const & everypar)
1375 {
1376         LASSERT(runparams.par_begin <= runparams.par_end,
1377                 { os << "% LaTeX Output Error\n"; return; } );
1378
1379         BufferParams const & bparams = buf.params();
1380         BufferParams const & mparams = buf.masterParams();
1381
1382         bool const maintext = text.isMainText();
1383         bool const is_child = buf.masterBuffer() != &buf;
1384         bool const multibib_child = maintext && is_child
1385                         && mparams.multibib == "child";
1386
1387         if (multibib_child && mparams.useBiblatex())
1388                 os << "\\newrefsection";
1389         else if (multibib_child && mparams.useBibtopic()) {
1390                 os << "\\begin{btUnit}\n";
1391                 runparams.openbtUnit = true;
1392         }
1393
1394         // Open a CJK environment at the beginning of the main buffer
1395         // if the document's language is a CJK language
1396         // (but not in child documents)
1397         OutputState * state = getOutputState();
1398         if (maintext && !is_child
1399             && bparams.encoding().package() == Encoding::CJK) {
1400                 os << "\\begin{CJK}{" << from_ascii(bparams.encoding().latexName())
1401                 << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
1402                 state->open_encoding_ = CJK;
1403         }
1404         // if "auto begin" is switched off, explicitly switch the
1405         // language on at start
1406         string const mainlang = runparams.use_polyglossia
1407                 ? getPolyglossiaEnvName(bparams.language)
1408                 : bparams.language->babel();
1409         string const lang_begin_command = runparams.use_polyglossia ?
1410                 "\\begin{$$lang}$$opts" : lyxrc.language_command_begin;
1411         string const lang_end_command = runparams.use_polyglossia ?
1412                 "\\end{$$lang}" : lyxrc.language_command_end;
1413         bool const using_begin_end = runparams.use_polyglossia ||
1414                                         !lang_end_command.empty();
1415
1416         if (maintext && !lyxrc.language_auto_begin &&
1417             !mainlang.empty()) {
1418                 // FIXME UNICODE
1419                 string bc = runparams.use_polyglossia ?
1420                             getPolyglossiaBegin(lang_begin_command, mainlang,
1421                                                 bparams.language->polyglossiaOpts())
1422                           : subst(lang_begin_command, "$$lang", mainlang);
1423                 os << bc;
1424                 os << '\n';
1425                 if (using_begin_end)
1426                         pushLanguageName(mainlang);
1427         }
1428
1429         ParagraphList const & paragraphs = text.paragraphs();
1430
1431         if (runparams.par_begin == runparams.par_end) {
1432                 // The full doc will be exported but it is easier to just rely on
1433                 // runparams range parameters that will be passed TeXEnvironment.
1434                 runparams.par_begin = 0;
1435                 runparams.par_end = paragraphs.size();
1436         }
1437
1438         pit_type pit = runparams.par_begin;
1439         // lastpit is for the language check after the loop.
1440         pit_type lastpit = pit;
1441         // variables used in the loop:
1442         bool was_title = false;
1443         bool already_title = false;
1444         DocumentClass const & tclass = bparams.documentClass();
1445
1446         // Did we already warn about inTitle layout mixing? (we only warn once)
1447         bool gave_layout_warning = false;
1448         for (; pit < runparams.par_end; ++pit) {
1449                 lastpit = pit;
1450                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
1451
1452                 // FIXME This check should not be needed. We should
1453                 // perhaps issue an error if it is.
1454                 Layout const & layout = text.inset().forcePlainLayout() ?
1455                                 tclass.plainLayout() : par->layout();
1456
1457                 if (layout.intitle) {
1458                         if (already_title) {
1459                                 if (!gave_layout_warning && !runparams.dryrun) {
1460                                         gave_layout_warning = true;
1461                                         frontend::Alert::warning(_("Error in latexParagraphs"),
1462                                                         bformat(_("You are using at least one "
1463                                                           "layout (%1$s) intended for the title, "
1464                                                           "after using non-title layouts. This "
1465                                                           "could lead to missing or incorrect output."
1466                                                           ), layout.name()));
1467                                 }
1468                         } else if (!was_title) {
1469                                 was_title = true;
1470                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1471                                         os << "\\begin{"
1472                                                         << from_ascii(tclass.titlename())
1473                                                         << "}\n";
1474                                 }
1475                         }
1476                 } else if (was_title && !already_title && !layout.inpreamble) {
1477                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
1478                                 os << "\\end{" << from_ascii(tclass.titlename())
1479                                                 << "}\n";
1480                         }
1481                         else {
1482                                 os << "\\" << from_ascii(tclass.titlename())
1483                                                 << "\n";
1484                         }
1485                         already_title = true;
1486                         was_title = false;
1487                 }
1488
1489                 if (layout.isCommand() && !layout.latexname().empty()
1490                     && layout.latexname() == bparams.multibib) {
1491                         if (runparams.openbtUnit)
1492                                 os << "\\end{btUnit}\n";
1493                         if (!bparams.useBiblatex()) {
1494                                 os << '\n' << "\\begin{btUnit}\n";
1495                                 runparams.openbtUnit = true;
1496                         }
1497                 }
1498
1499                 if (!layout.isEnvironment() && par->params().leftIndent().zero()) {
1500                         // This is a standard top level paragraph, TeX it and continue.
1501                         TeXOnePar(buf, text, pit, os, runparams, everypar);
1502                         continue;
1503                 }
1504
1505                 TeXEnvironmentData const data =
1506                         prepareEnvironment(buf, text, par, os, runparams);
1507                 // pit can be changed in TeXEnvironment.
1508                 TeXEnvironment(buf, text, runparams, pit, os);
1509                 finishEnvironment(os, runparams, data);
1510         }
1511
1512         if (pit == runparams.par_end) {
1513                         // Make sure that the last paragraph is
1514                         // correctly terminated (because TeXOnePar does
1515                         // not add a \n in this case)
1516                         //os << '\n';
1517         }
1518
1519         // It might be that we only have a title in this document
1520         if (was_title && !already_title) {
1521                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1522                         os << "\\end{" << from_ascii(tclass.titlename())
1523                            << "}\n";
1524                 } else {
1525                         os << "\\" << from_ascii(tclass.titlename())
1526                            << "\n";
1527                 }
1528         }
1529
1530         if (maintext && !is_child && runparams.openbtUnit)
1531                 os << "\\end{btUnit}\n";
1532
1533         // if "auto end" is switched off, explicitly close the language at the end
1534         // but only if the last par is in a babel or polyglossia language
1535         if (maintext && !lyxrc.language_auto_end && !mainlang.empty() &&
1536                 paragraphs.at(lastpit).getParLanguage(bparams)->encoding()->package() != Encoding::CJK) {
1537                 os << from_utf8(subst(lang_end_command,
1538                                         "$$lang",
1539                                         mainlang))
1540                         << '\n';
1541                 if (using_begin_end)
1542                         popLanguageName();
1543         }
1544
1545         // If the last paragraph is an environment, we'll have to close
1546         // CJK at the very end to do proper nesting.
1547         if (maintext && !is_child && state->open_encoding_ == CJK) {
1548                 os << "\\end{CJK}\n";
1549                 state->open_encoding_ = none;
1550         }
1551         // Likewise for polyglossia or when using begin/end commands
1552         string const & cur_lang = openLanguageName(state);
1553         if (maintext && !is_child && !cur_lang.empty()) {
1554                 os << from_utf8(subst(lang_end_command,
1555                                         "$$lang",
1556                                         cur_lang))
1557                    << '\n';
1558                 if (using_begin_end)
1559                         popLanguageName();
1560         }
1561
1562         // reset inherited encoding
1563         if (state->cjk_inherited_ > 0) {
1564                 state->cjk_inherited_ -= 1;
1565                 if (state->cjk_inherited_ == 0)
1566                         state->open_encoding_ = CJK;
1567         }
1568
1569         if (multibib_child && mparams.useBibtopic()) {
1570                 os << "\\end{btUnit}\n";
1571                 runparams.openbtUnit = false;
1572         }
1573 }
1574
1575
1576 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
1577                    OutputParams const & runparams, Encoding const & newEnc,
1578                    bool force, bool noswitchmacro)
1579 {
1580         // XeTeX/LuaTeX use only one encoding per document:
1581         // * with useNonTeXFonts: "utf8plain",
1582         // * with XeTeX and TeX fonts: "ascii" (inputenc fails),
1583         // * with LuaTeX and TeX fonts: only one encoding accepted by luainputenc.
1584         if (runparams.isFullUnicode() || newEnc.name() == "inherit")
1585                 return make_pair(false, 0);
1586
1587         Encoding const & oldEnc = *runparams.encoding;
1588         bool moving_arg = runparams.moving_arg;
1589         // If we switch from/to CJK, we need to switch anyway, despite custom inputenc
1590         bool const from_to_cjk =
1591                 (oldEnc.package() == Encoding::CJK && newEnc.package() != Encoding::CJK)
1592                 || (oldEnc.package() != Encoding::CJK && newEnc.package() == Encoding::CJK);
1593         if (!force && !from_to_cjk
1594             && ((bparams.inputenc != "auto" && bparams.inputenc != "default") || moving_arg))
1595                 return make_pair(false, 0);
1596
1597         // Do nothing if the encoding is unchanged.
1598         if (oldEnc.name() == newEnc.name())
1599                 return make_pair(false, 0);
1600
1601         // FIXME We ignore encoding switches from/to encodings that do
1602         // neither support the inputenc package nor the CJK package here.
1603         // This does of course only work in special cases (e.g. switch from
1604         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
1605         // but it is the best we can do
1606         if (oldEnc.package() == Encoding::none
1607                 || newEnc.package() == Encoding::none)
1608                 return make_pair(false, 0);
1609
1610         LYXERR(Debug::LATEX, "Changing LaTeX encoding from "
1611                 << oldEnc.name() << " to " << newEnc.name());
1612         os << setEncoding(newEnc.iconvName());
1613         if (bparams.inputenc == "default")
1614                 return make_pair(true, 0);
1615
1616         docstring const inputenc_arg(from_ascii(newEnc.latexName()));
1617         OutputState * state = getOutputState();
1618         switch (newEnc.package()) {
1619                 case Encoding::none:
1620                 case Encoding::japanese:
1621                         // shouldn't ever reach here, see above
1622                         return make_pair(true, 0);
1623                 case Encoding::inputenc: {
1624                         int count = inputenc_arg.length();
1625                         if (oldEnc.package() == Encoding::CJK &&
1626                             state->open_encoding_ == CJK) {
1627                                 os << "\\end{CJK}";
1628                                 state->open_encoding_ = none;
1629                                 count += 9;
1630                         }
1631                         else if (oldEnc.package() == Encoding::inputenc &&
1632                                  state->open_encoding_ == inputenc) {
1633                                 os << "\\egroup";
1634                                 state->open_encoding_ = none;
1635                                 count += 7;
1636                         }
1637                         if (runparams.local_font != 0
1638                             &&  oldEnc.package() == Encoding::CJK) {
1639                                 // within insets, \inputenc switches need
1640                                 // to be embraced within \bgroup...\egroup;
1641                                 // else CJK fails.
1642                                 os << "\\bgroup";
1643                                 count += 7;
1644                                 state->open_encoding_ = inputenc;
1645                         }
1646                         // with the japanese option, inputenc is omitted.
1647                         if (runparams.use_japanese || noswitchmacro)
1648                                 return make_pair(true, count);
1649                         os << "\\inputencoding{" << inputenc_arg << '}';
1650                         return make_pair(true, count + 16);
1651                 }
1652                 case Encoding::CJK: {
1653                         int count = inputenc_arg.length();
1654                         if (oldEnc.package() == Encoding::CJK &&
1655                             state->open_encoding_ == CJK) {
1656                                 os << "\\end{CJK}";
1657                                 count += 9;
1658                         }
1659                         if (oldEnc.package() == Encoding::inputenc &&
1660                             state->open_encoding_ == inputenc) {
1661                                 os << "\\egroup";
1662                                 count += 7;
1663                         }
1664                         os << "\\begin{CJK}{" << inputenc_arg << "}{"
1665                            << from_ascii(bparams.fonts_cjk) << "}";
1666                         state->open_encoding_ = CJK;
1667                         return make_pair(true, count + 15);
1668                 }
1669         }
1670         // Dead code to avoid a warning:
1671         return make_pair(true, 0);
1672
1673 }
1674
1675 } // namespace lyx