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 {
 147         string result;
 148         if (!lang.empty())
 149                 result = subst(lang_begin_command, "$$lang", lang);
 150         string options = opts.empty() ?
 151                     string() : "[" + opts + "]";
 152         result = subst(result, "$$opts", options);
 153
 154         return result;
 155 }
 156
 157
 158 struct TeXEnvironmentData
 159 {
 160         bool cjk_nested;
 161         Layout const * style;
 162         Language const * par_language;
 163         Encoding const * prev_encoding;
 164         bool leftindent_open;
 165 };
 166
 167
 168 static TeXEnvironmentData prepareEnvironment(Buffer const & buf,
 169                                         Text const & text,
 170                                         ParagraphList::const_iterator pit,
 171                                         otexstream & os,
 172                                         OutputParams const & runparams)
 173 {
 174         TeXEnvironmentData data;
 175
 176         BufferParams const & bparams = buf.params();
 177
 178         // FIXME This test should not be necessary.
 179         // We should perhaps issue an error if it is.
 180         Layout const & style = text.inset().forcePlainLayout() ?
 181                 bparams.documentClass().plainLayout() : pit->layout();
 182
 183         ParagraphList const & paragraphs = text.paragraphs();
 184         ParagraphList::const_iterator const priorpit =
 185                 pit == paragraphs.begin() ? pit : prev(pit, 1);
 186
 187         OutputState * state = getOutputState();
 188         bool const use_prev_env_language = state->prev_env_language_ != 0
 189                         && priorpit->layout().isEnvironment()
 190                         && (priorpit->getDepth() > pit->getDepth()
 191                             || (priorpit->getDepth() == pit->getDepth()
 192                                 && priorpit->layout() != pit->layout()));
 193
 194         data.prev_encoding = runparams.encoding;
 195         data.par_language = pit->getParLanguage(bparams);
 196         Language const * const doc_language = bparams.language;
 197         Language const * const prev_par_language =
 198                 (pit != paragraphs.begin())
 199                 ? (use_prev_env_language ? state->prev_env_language_
 200                                          : priorpit->getParLanguage(bparams))
 201                 : doc_language;
 202
 203         bool const use_polyglossia = runparams.use_polyglossia;
 204         string const par_lang = use_polyglossia ?
 205                 getPolyglossiaEnvName(data.par_language) : data.par_language->babel();
 206         string const prev_par_lang = use_polyglossia ?
 207                 getPolyglossiaEnvName(prev_par_language) : prev_par_language->babel();
 208         string const doc_lang = use_polyglossia ?
 209                 getPolyglossiaEnvName(doc_language) : doc_language->babel();
 210         string const lang_begin_command = use_polyglossia ?
 211                 "\\begin{$$lang}" : lyxrc.language_command_begin;
 212         string const lang_end_command = use_polyglossia ?
 213                 "\\end{$$lang}" : lyxrc.language_command_end;
 214         bool const using_begin_end = use_polyglossia ||
 215                                         !lang_end_command.empty();
 216
 217         // For polyglossia, switch language outside of environment, if possible.
 218         if (par_lang != prev_par_lang) {
 219                 if ((!using_begin_end || langOpenedAtThisLevel(state)) &&
 220                     !lang_end_command.empty() &&
 221                     prev_par_lang != doc_lang &&
 222                     !prev_par_lang.empty()) {
 223                         os << from_ascii(subst(
 224                                 lang_end_command,
 225                                 "$$lang",
 226                                 prev_par_lang))
 227                           // the '%' is necessary to prevent unwanted whitespace
 228                           << "%\n";
 229                         if (using_begin_end)
 230                                 popLanguageName();
 231                 }
 232
 233                 // If no language was explicitly opened and we are using
 234                 // polyglossia or begin/end commands, then the current
 235                 // language is the document language.
 236                 string const & cur_lang = using_begin_end
 237                                           && state->lang_switch_depth_.size()
 238                                                   ? openLanguageName(state)
 239                                                   : doc_lang;
 240
 241                 if ((lang_end_command.empty() ||
 242                     par_lang != doc_lang ||
 243                     par_lang != cur_lang) &&
 244                     !par_lang.empty()) {
 245                             string bc = use_polyglossia ?
 246                                         getPolyglossiaBegin(lang_begin_command, par_lang,
 247                                                             data.par_language->polyglossiaOpts())
 248                                       : subst(lang_begin_command, "$$lang", par_lang);
 249                             os << bc;
 250                             // the '%' is necessary to prevent unwanted whitespace
 251                             os << "%\n";
 252                             if (using_begin_end)
 253                                     pushLanguageName(par_lang);
 254                 }
 255         }
 256
 257         data.leftindent_open = false;
 258         if (!pit->params().leftIndent().zero()) {
 259                 os << "\\begin{LyXParagraphLeftIndent}{"
 260                    << from_ascii(pit->params().leftIndent().asLatexString())
 261                    << "}\n";
 262                 data.leftindent_open = true;
 263         }
 264
 265         if (style.isEnvironment())
 266                 state->nest_level_ += 1;
 267
 268         if (style.isEnvironment() && !style.latexname().empty()) {
 269                 os << "\\begin{" << from_ascii(style.latexname()) << '}';
 270                 if (!style.latexargs().empty()) {
 271                         OutputParams rp = runparams;
 272                         rp.local_font = &pit->getFirstFontSettings(bparams);
 273                         latexArgInsets(paragraphs, pit, os, rp, style.latexargs());
 274                 }
 275                 if (style.latextype == LATEX_LIST_ENVIRONMENT) {
 276                         os << '{'
 277                            << pit->params().labelWidthString()
 278                            << "}\n";
 279                 } else if (style.labeltype == LABEL_BIBLIO) {
 280                         if (pit->params().labelWidthString().empty())
 281                                 os << '{' << bibitemWidest(buf, runparams) << "}\n";
 282                         else
 283                                 os << '{'
 284                                   << pit->params().labelWidthString()
 285                                   << "}\n";
 286                 } else
 287                         os << from_ascii(style.latexparam()) << '\n';
 288         }
 289         data.style = &style;
 290
 291         // in multilingual environments, the CJK tags have to be nested properly
 292         data.cjk_nested = false;
 293         if (data.par_language->encoding()->package() == Encoding::CJK &&
 294             state->open_encoding_ != CJK && pit->isMultiLingual(bparams)) {
 295                 if (prev_par_language->encoding()->package() == Encoding::CJK)
 296                         os << "\\begin{CJK}{" << from_ascii(data.par_language->encoding()->latexName())
 297                            << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 298                 state->open_encoding_ = CJK;
 299                 data.cjk_nested = true;
 300         }
 301         return data;
 302 }
 303
 304
 305 static void finishEnvironment(otexstream & os, OutputParams const & runparams,
 306                               TeXEnvironmentData const & data)
 307 {
 308         OutputState * state = getOutputState();
 309         // BufferParams const & bparams = buf.params(); // FIXME: for speedup shortcut below, would require passing of "buf" as argument
 310         if (state->open_encoding_ == CJK && data.cjk_nested) {
 311                 // We need to close the encoding even if it does not change
 312                 // to do correct environment nesting
 313                 os << "\\end{CJK}\n";
 314                 state->open_encoding_ = none;
 315         }
 316
 317         if (data.style->isEnvironment()) {
 318                 os << breakln;
 319                 bool const using_begin_end =
 320                         runparams.use_polyglossia ||
 321                                 !lyxrc.language_command_end.empty();
 322                 // Close any language opened at this nest level
 323                 if (using_begin_end) {
 324                         while (langOpenedAtThisLevel(state)) {
 325                                 if (isLocalSwitch(state)) {
 326                                         os << "}";
 327                                 } else {
 328                                         os << "\\end{"
 329                                            << openLanguageName(state)
 330                                            << "}%\n";
 331                                 }
 332                                 popLanguageName();
 333                         }
 334                 }
 335                 state->nest_level_ -= 1;
 336                 string const & name = data.style->latexname();
 337                 if (!name.empty())
 338                         os << "\\end{" << from_ascii(name) << "}\n";
 339                 state->prev_env_language_ = data.par_language;
 340                 if (runparams.encoding != data.prev_encoding) {
 341                         runparams.encoding = data.prev_encoding;
 342                         os << setEncoding(data.prev_encoding->iconvName());
 343                 }
 344         }
 345
 346         if (data.leftindent_open) {
 347                 os << breakln << "\\end{LyXParagraphLeftIndent}\n";
 348                 state->prev_env_language_ = data.par_language;
 349                 if (runparams.encoding != data.prev_encoding) {
 350                         runparams.encoding = data.prev_encoding;
 351                         os << setEncoding(data.prev_encoding->iconvName());
 352                 }
 353         }
 354
 355         // Check whether we should output a blank line after the environment
 356         if (!data.style->nextnoindent)
 357                 os << '\n';
 358 }
 359
 360
 361 void TeXEnvironment(Buffer const & buf, Text const & text,
 362                     OutputParams const & runparams,
 363                     pit_type & pit, otexstream & os)
 364 {
 365         ParagraphList const & paragraphs = text.paragraphs();
 366         ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 367         LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << pit);
 368
 369         Layout const & current_layout = par->layout();
 370         depth_type const current_depth = par->params().depth();
 371         Length const & current_left_indent = par->params().leftIndent();
 372
 373         // This is for debugging purpose at the end.
 374         pit_type const par_begin = pit;
 375         for (; pit < runparams.par_end; ++pit) {
 376                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 377
 378                 // check first if this is an higher depth paragraph.
 379                 bool go_out = (par->params().depth() < current_depth);
 380                 if (par->params().depth() == current_depth) {
 381                         // This environment is finished.
 382                         go_out |= (par->layout() != current_layout);
 383                         go_out |= (par->params().leftIndent() != current_left_indent);
 384                 }
 385                 if (go_out) {
 386                         // nothing to do here, restore pit and go out.
 387                         pit--;
 388                         break;
 389                 }
 390
 391                 if (par->layout() == current_layout
 392                         && par->params().depth() == current_depth
 393                         && par->params().leftIndent() == current_left_indent) {
 394                         // We are still in the same environment so TeXOnePar and continue;
 395                         TeXOnePar(buf, text, pit, os, runparams);
 396                         continue;
 397                 }
 398
 399                 // We are now in a deeper environment.
 400                 // Either par->layout() != current_layout
 401                 // Or     par->params().depth() > current_depth
 402                 // Or     par->params().leftIndent() != current_left_indent)
 403
 404                 // FIXME This test should not be necessary.
 405                 // We should perhaps issue an error if it is.
 406                 bool const force_plain_layout = text.inset().forcePlainLayout();
 407                 Layout const & style = force_plain_layout
 408                         ? buf.params().documentClass().plainLayout()
 409                         : par->layout();
 410
 411                 if (!style.isEnvironment()) {
 412                         // This is a standard paragraph, no need to call TeXEnvironment.
 413                         TeXOnePar(buf, text, pit, os, runparams);
 414                         continue;
 415                 }
 416
 417                 // This is a new environment.
 418                 TeXEnvironmentData const data =
 419                         prepareEnvironment(buf, text, par, os, runparams);
 420                 // Recursive call to TeXEnvironment!
 421                 TeXEnvironment(buf, text, runparams, pit, os);
 422                 finishEnvironment(os, runparams, data);
 423         }
 424
 425         if (pit != runparams.par_end)
 426                 LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << par_begin << " done.");
 427 }
 428
 429
 430 void getArgInsets(otexstream & os, OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs,
 431                   map<int, lyx::InsetArgument const *> ilist, vector<string> required, string const & prefix)
 432 {
 433         unsigned int const argnr = latexargs.size();
 434         if (argnr == 0)
 435                 return;
 436
 437         // Default and preset args are always output, so if they require
 438         // other arguments, consider this.
 439         Layout::LaTeXArgMap::const_iterator lit = latexargs.begin();
 440         Layout::LaTeXArgMap::const_iterator const lend = latexargs.end();
 441         for (; lit != lend; ++lit) {
 442                 Layout::latexarg arg = (*lit).second;
 443                 if ((!arg.presetarg.empty() || !arg.defaultarg.empty()) && !arg.requires.empty()) {
 444                                 vector<string> req = getVectorFromString(arg.requires);
 445                                 required.insert(required.end(), req.begin(), req.end());
 446                         }
 447         }
 448
 449         for (unsigned int i = 1; i <= argnr; ++i) {
 450                 map<int, InsetArgument const *>::const_iterator lit = ilist.find(i);
 451                 bool inserted = false;
 452                 if (lit != ilist.end()) {
 453                         InsetArgument const * ins = (*lit).second;
 454                         if (ins) {
 455                                 Layout::LaTeXArgMap::const_iterator const lait =
 456                                                 latexargs.find(ins->name());
 457                                 if (lait != latexargs.end()) {
 458                                         Layout::latexarg arg = (*lait).second;
 459                                         docstring ldelim = arg.mandatory ?
 460                                                         from_ascii("{") : from_ascii("[");
 461                                         docstring rdelim = arg.mandatory ?
 462                                                         from_ascii("}") : from_ascii("]");
 463                                         if (!arg.ldelim.empty())
 464                                                 ldelim = arg.ldelim;
 465                                         if (!arg.rdelim.empty())
 466                                                 rdelim = arg.rdelim;
 467                                         ins->latexArgument(os, runparams, ldelim, rdelim, arg.presetarg);
 468                                         inserted = true;
 469                                 }
 470                         }
 471                 }
 472                 if (!inserted) {
 473                         Layout::LaTeXArgMap::const_iterator lait = latexargs.begin();
 474                         Layout::LaTeXArgMap::const_iterator const laend = latexargs.end();
 475                         for (; lait != laend; ++lait) {
 476                                 string const name = prefix + convert<string>(i);
 477                                 if ((*lait).first == name) {
 478                                         Layout::latexarg arg = (*lait).second;
 479                                         docstring preset = arg.presetarg;
 480                                         if (!arg.defaultarg.empty()) {
 481                                                 if (!preset.empty())
 482                                                         preset += ",";
 483                                                 preset += arg.defaultarg;
 484                                         }
 485                                         if (arg.mandatory) {
 486                                                 docstring ldelim = arg.ldelim.empty() ?
 487                                                                 from_ascii("{") : arg.ldelim;
 488                                                 docstring rdelim = arg.rdelim.empty() ?
 489                                                                 from_ascii("}") : arg.rdelim;
 490                                                 os << ldelim << preset << rdelim;
 491                                         } else if (!preset.empty()) {
 492                                                 docstring ldelim = arg.ldelim.empty() ?
 493                                                                 from_ascii("[") : arg.ldelim;
 494                                                 docstring rdelim = arg.rdelim.empty() ?
 495                                                                 from_ascii("]") : arg.rdelim;
 496                                                 os << ldelim << preset << rdelim;
 497                                         } else if (find(required.begin(), required.end(),
 498                                                    (*lait).first) != required.end()) {
 499                                                 docstring ldelim = arg.ldelim.empty() ?
 500                                                                 from_ascii("[") : arg.ldelim;
 501                                                 docstring rdelim = arg.rdelim.empty() ?
 502                                                                 from_ascii("]") : arg.rdelim;
 503                                                 os << ldelim << rdelim;
 504                                         } else
 505                                                 break;
 506                                 }
 507                         }
 508                 }
 509         }
 510 }
 511
 512
 513 } // namespace
 514
 515
 516 void pushLanguageName(string const & lang_name, bool localswitch)
 517 {
 518         OutputState * state = getOutputState();
 519
 520         int nest_level = localswitch ? -state->nest_level_ : state->nest_level_;
 521         state->lang_switch_depth_.push(nest_level);
 522         state->open_polyglossia_lang_.push(lang_name);
 523 }
 524
 525
 526 void popLanguageName()
 527 {
 528         OutputState * state = getOutputState();
 529
 530         state->lang_switch_depth_.pop();
 531         state->open_polyglossia_lang_.pop();
 532 }
 533
 534
 535 namespace {
 536
 537 void addArgInsets(Paragraph const & par, string const & prefix,
 538                  Layout::LaTeXArgMap const & latexargs,
 539                  map<int, InsetArgument const *> & ilist,
 540                  vector<string> & required)
 541 {
 542         for (auto const & table : par.insetList()) {
 543                 InsetArgument const * arg = table.inset->asInsetArgument();
 544                 if (!arg)
 545                         continue;
 546                 if (arg->name().empty()) {
 547                         LYXERR0("Error: Unnamed argument inset!");
 548                         continue;
 549                 }
 550                 string const name = prefix.empty() ?
 551                         arg->name() : split(arg->name(), ':');
 552                 // why converting into an integer?
 553                 unsigned int const nr = convert<unsigned int>(name);
 554                 if (ilist.find(nr) == ilist.end())
 555                         ilist[nr] = arg;
 556                 Layout::LaTeXArgMap::const_iterator const lit =
 557                         latexargs.find(arg->name());
 558                 if (lit != latexargs.end()) {
 559                         Layout::latexarg const & larg = lit->second;
 560                         vector<string> req = getVectorFromString(larg.requires);
 561                         move(req.begin(), req.end(), back_inserter(required));
 562                 }
 563         }
 564 }
 565
 566 } // namespace
 567
 568
 569 void latexArgInsets(Paragraph const & par, otexstream & os,
 570                     OutputParams const & runparams,
 571                     Layout::LaTeXArgMap const & latexargs,
 572                     string const & prefix)
 573 {
 574         map<int, InsetArgument const *> ilist;
 575         vector<string> required;
 576         addArgInsets(par, prefix, latexargs, ilist, required);
 577         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 578 }
 579
 580
 581 void latexArgInsets(ParagraphList const & pars,
 582                     ParagraphList::const_iterator pit,
 583                     otexstream & os, OutputParams const & runparams,
 584                     Layout::LaTeXArgMap const & latexargs,
 585                     string const & prefix)
 586 {
 587         map<int, InsetArgument const *> ilist;
 588         vector<string> required;
 589
 590         depth_type const current_depth = pit->params().depth();
 591         Layout const current_layout = pit->layout();
 592
 593         // get the first paragraph in sequence with this layout and depth
 594         pit_type offset = 0;
 595         while (true) {
 596                 if (lyx::prev(pit, offset) == pars.begin())
 597                         break;
 598                 ParagraphList::const_iterator priorpit = lyx::prev(pit, offset + 1);
 599                 if (priorpit->layout() == current_layout
 600                     && priorpit->params().depth() == current_depth)
 601                         ++offset;
 602                 else
 603                         break;
 604         }
 605
 606         ParagraphList::const_iterator spit = lyx::prev(pit, offset);
 607
 608         for (; spit != pars.end(); ++spit) {
 609                 if (spit->layout() != current_layout ||
 610                     spit->params().depth() < current_depth)
 611                         break;
 612                 if (spit->params().depth() > current_depth)
 613                         continue;
 614                 addArgInsets(*spit, prefix, latexargs, ilist, required);
 615         }
 616         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 617 }
 618
 619
 620 void latexArgInsetsForParent(ParagraphList const & pars, otexstream & os,
 621                              OutputParams const & runparams,
 622                              Layout::LaTeXArgMap const & latexargs,
 623                              string const & prefix)
 624 {
 625         map<int, InsetArgument const *> ilist;
 626         vector<string> required;
 627
 628         for (Paragraph const & par : pars) {
 629                 if (par.layout().hasArgs())
 630                         // The InsetArguments inside this paragraph refer to this paragraph
 631                         continue;
 632                 addArgInsets(par, prefix, latexargs, ilist, required);
 633         }
 634         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 635 }
 636
 637
 638 namespace {
 639
 640 // output the proper paragraph start according to latextype.
 641 void parStartCommand(Paragraph const & par, otexstream & os,
 642                      OutputParams const & runparams, Layout const & style)
 643 {
 644         switch (style.latextype) {
 645         case LATEX_COMMAND:
 646                 os << '\\' << from_ascii(style.latexname());
 647
 648                 // Command arguments
 649                 if (!style.latexargs().empty())
 650                         latexArgInsets(par, os, runparams, style.latexargs());
 651                 os << from_ascii(style.latexparam());
 652                 break;
 653         case LATEX_ITEM_ENVIRONMENT:
 654         case LATEX_LIST_ENVIRONMENT:
 655                 os << "\\" + style.itemcommand();
 656                 // Item arguments
 657                 if (!style.itemargs().empty())
 658                         latexArgInsets(par, os, runparams, style.itemargs(), "item:");
 659                 os << " ";
 660                 break;
 661         case LATEX_BIB_ENVIRONMENT:
 662                 // ignore this, the inset will write itself
 663                 break;
 664         default:
 665                 break;
 666         }
 667 }
 668
 669 } // namespace
 670
 671 // FIXME: this should be anonymous
 672 void TeXOnePar(Buffer const & buf,
 673                Text const & text,
 674                pit_type pit,
 675                otexstream & os,
 676                OutputParams const & runparams_in,
 677                string const & everypar,
 678                int start_pos, int end_pos)
 679 {
 680         BufferParams const & bparams = runparams_in.is_child
 681                 ? buf.masterParams() : buf.params();
 682         ParagraphList const & paragraphs = text.paragraphs();
 683         Paragraph const & par = paragraphs.at(pit);
 684         // FIXME This check should not really be needed.
 685         // Perhaps we should issue an error if it is.
 686         Layout const & style = text.inset().forcePlainLayout() ?
 687                 bparams.documentClass().plainLayout() : par.layout();
 688
 689         if (style.inpreamble)
 690                 return;
 691
 692         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " ptr " << &par << " '"
 693                 << everypar << "'");
 694
 695         OutputParams runparams = runparams_in;
 696         runparams.isLastPar = (pit == pit_type(paragraphs.size() - 1));
 697         // We reinitialze par begin and end to be on the safe side
 698         // with embedded inset as we don't know if they set those
 699         // value correctly.
 700         runparams.par_begin = 0;
 701         runparams.par_end = 0;
 702
 703         bool const maintext = text.isMainText();
 704         // we are at the beginning of an inset and CJK is already open;
 705         // we count inheritation levels to get the inset nesting right.
 706         OutputState * state = getOutputState();
 707         if (pit == 0 && !maintext
 708             && (state->cjk_inherited_ > 0 || state->open_encoding_ == CJK)) {
 709                 state->cjk_inherited_ += 1;
 710                 state->open_encoding_ = none;
 711         }
 712
 713         if (text.inset().isPassThru()) {
 714                 Font const outerfont = text.outerFont(pit);
 715
 716                 // No newline before first paragraph in this lyxtext
 717                 if (pit > 0) {
 718                         os << '\n';
 719                         if (!text.inset().getLayout().parbreakIsNewline())
 720                                 os << '\n';
 721                 }
 722
 723                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 724                 return;
 725         }
 726
 727         Paragraph const * nextpar = runparams.isLastPar
 728                 ? 0 : &paragraphs.at(pit + 1);
 729
 730         if (style.pass_thru) {
 731                 Font const outerfont = text.outerFont(pit);
 732                 parStartCommand(par, os, runparams, style);
 733
 734                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 735
 736                 // I did not create a parEndCommand for this minuscule
 737                 // task because in the other user of parStartCommand
 738                 // the code is different (JMarc)
 739                 if (style.isCommand())
 740                         os << "}\n";
 741                 else
 742                         os << '\n';
 743                 if (!style.parbreak_is_newline) {
 744                         os << '\n';
 745                 } else if (nextpar && !style.isEnvironment()) {
 746                         Layout const nextstyle = text.inset().forcePlainLayout()
 747                                 ? bparams.documentClass().plainLayout()
 748                                 : nextpar->layout();
 749                         if (nextstyle.name() != style.name())
 750                                 os << '\n';
 751                 }
 752
 753                 return;
 754         }
 755
 756         // This paragraph's language
 757         Language const * const par_language = par.getParLanguage(bparams);
 758         Language const * const nextpar_language = nextpar ?
 759                 nextpar->getParLanguage(bparams) : 0;
 760         // The document's language
 761         Language const * const doc_language = bparams.language;
 762         // The language that was in effect when the environment this paragraph is
 763         // inside of was opened
 764         Language const * const outer_language =
 765                 (runparams.local_font != 0) ?
 766                         runparams.local_font->language() : doc_language;
 767
 768         Paragraph const * priorpar = (pit == 0) ? 0 : &paragraphs.at(pit - 1);
 769
 770         // The previous language that was in effect is the language of the
 771         // previous paragraph, unless the previous paragraph is inside an
 772         // environment with nesting depth greater than (or equal to, but with
 773         // a different layout) the current one. If there is no previous
 774         // paragraph, the previous language is the outer language.
 775         bool const use_prev_env_language = state->prev_env_language_ != 0
 776                         && priorpar
 777                         && priorpar->layout().isEnvironment()
 778                         && (priorpar->getDepth() > par.getDepth()
 779                             || (priorpar->getDepth() == par.getDepth()
 780                                     && priorpar->layout() != par.layout()));
 781         Language const * const prev_language =
 782                 (pit != 0)
 783                 ? (use_prev_env_language ? state->prev_env_language_
 784                                          : priorpar->getParLanguage(bparams))
 785                 : outer_language;
 786
 787
 788         bool const use_polyglossia = runparams.use_polyglossia;
 789         string const par_lang = use_polyglossia ?
 790                 getPolyglossiaEnvName(par_language): par_language->babel();
 791         string const prev_lang = use_polyglossia ?
 792                 getPolyglossiaEnvName(prev_language) : prev_language->babel();
 793         string const outer_lang = use_polyglossia ?
 794                 getPolyglossiaEnvName(outer_language) : outer_language->babel();
 795         string const nextpar_lang = nextpar_language ? (use_polyglossia ?
 796                 getPolyglossiaEnvName(nextpar_language) :
 797                 nextpar_language->babel()) : string();
 798         string lang_begin_command = use_polyglossia ?
 799                 "\\begin{$$lang}$$opts" : lyxrc.language_command_begin;
 800         string lang_end_command = use_polyglossia ?
 801                 "\\end{$$lang}" : lyxrc.language_command_end;
 802         // the '%' is necessary to prevent unwanted whitespace
 803         string lang_command_termination = "%\n";
 804         bool const using_begin_end = use_polyglossia ||
 805                                         !lang_end_command.empty();
 806
 807         // In some insets (such as Arguments), we cannot use \selectlanguage
 808         bool const localswitch = text.inset().forceLocalFontSwitch()
 809                         || (using_begin_end && text.inset().forcePlainLayout());
 810         if (localswitch) {
 811                 lang_begin_command = use_polyglossia ?
 812                             "\\text$$lang$$opts{" : lyxrc.language_command_local;
 813                 lang_end_command = "}";
 814                 lang_command_termination.clear();
 815         }
 816
 817         if (par_lang != prev_lang
 818                 // check if we already put language command in TeXEnvironment()
 819                 && !(style.isEnvironment()
 820                      && (pit == 0 || (priorpar->layout() != par.layout()
 821                                           && priorpar->getDepth() <= par.getDepth())
 822                                   || priorpar->getDepth() < par.getDepth())))
 823         {
 824                 if ((!using_begin_end || langOpenedAtThisLevel(state)) &&
 825                     !lang_end_command.empty() &&
 826                     prev_lang != outer_lang &&
 827                     !prev_lang.empty() &&
 828                     (!using_begin_end || !style.isEnvironment()))
 829                 {
 830                         os << from_ascii(subst(lang_end_command,
 831                                 "$$lang",
 832                                 prev_lang))
 833                            << lang_command_termination;
 834                         if (using_begin_end)
 835                                 popLanguageName();
 836                 }
 837
 838                 // We need to open a new language if we couldn't close the previous
 839                 // one (because there's no language_command_end); and even if we closed
 840                 // the previous one, if the current language is different than the
 841                 // outer_language (which is currently in effect once the previous one
 842                 // is closed).
 843                 if ((lang_end_command.empty() || par_lang != outer_lang
 844                      || (!using_begin_end
 845                          || (style.isEnvironment() && par_lang != prev_lang)))
 846                         && !par_lang.empty()) {
 847                         // If we're inside an inset, and that inset is within an \L or \R
 848                         // (or equivalents), then within the inset, too, any opposite
 849                         // language paragraph should appear within an \L or \R (in addition
 850                         // to, outside of, the normal language switch commands).
 851                         // This behavior is not correct for ArabTeX, though.
 852                         if (!using_begin_end
 853                             // not for ArabTeX
 854                                 && par_language->lang() != "arabic_arabtex"
 855                                 && outer_language->lang() != "arabic_arabtex"
 856                             // are we in an inset?
 857                             && runparams.local_font != 0
 858                             // is the inset within an \L or \R?
 859                             //
 860                             // FIXME: currently, we don't check this; this means that
 861                             // we'll have unnnecessary \L and \R commands, but that
 862                             // doesn't seem to hurt (though latex will complain)
 863                             //
 864                             // is this paragraph in the opposite direction?
 865                             && runparams.local_font->isRightToLeft() != par_language->rightToLeft()) {
 866                                 // FIXME: I don't have a working copy of the Arabi package, so
 867                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 868                                 // or not...
 869                                 if (par_language->lang() == "farsi")
 870                                         os << "\\textFR{";
 871                                 else if (outer_language->lang() == "farsi")
 872                                         os << "\\textLR{";
 873                                 else if (par_language->lang() == "arabic_arabi")
 874                                         os << "\\textAR{";
 875                                 else if (outer_language->lang() == "arabic_arabi")
 876                                         os << "\\textLR{";
 877                                 // remaining RTL languages currently is hebrew
 878                                 else if (par_language->rightToLeft())
 879                                         os << "\\R{";
 880                                 else
 881                                         os << "\\L{";
 882                         }
 883                         // With CJK, the CJK tag has to be closed first (see below)
 884                         if (runparams.encoding->package() != Encoding::CJK
 885                             && (par_lang != openLanguageName(state) || localswitch)
 886                             && !par_lang.empty()) {
 887                                 string bc = use_polyglossia ?
 888                                           getPolyglossiaBegin(lang_begin_command, par_lang, par_language->polyglossiaOpts())
 889                                           : subst(lang_begin_command, "$$lang", par_lang);
 890                                 os << bc;
 891                                 os << lang_command_termination;
 892                                 if (using_begin_end)
 893                                         pushLanguageName(par_lang, localswitch);
 894                         }
 895                 }
 896         }
 897
 898         // Switch file encoding if necessary; no need to do this for "default"
 899         // encoding, since this only affects the position of the outputted
 900         // \inputencoding command; the encoding switch will occur when necessary
 901         if (bparams.inputenc == "auto"
 902                 && !runparams.isFullUnicode() // Xe/LuaTeX use one document-wide encoding  (see also switchEncoding())
 903                 && runparams.encoding->package() != Encoding::none) {
 904                 // Look ahead for future encoding changes.
 905                 // We try to output them at the beginning of the paragraph,
 906                 // since the \inputencoding command is not allowed e.g. in
 907                 // sections. For this reason we only set runparams.moving_arg
 908                 // after checking for the encoding change, otherwise the
 909                 // change would be always avoided by switchEncoding().
 910                 for (pos_type i = 0; i < par.size(); ++i) {
 911                         char_type const c = par.getChar(i);
 912                         Encoding const * const encoding =
 913                                 par.getFontSettings(bparams, i).language()->encoding();
 914                         if (encoding->package() != Encoding::CJK
 915                                 && runparams.encoding->package() == Encoding::inputenc
 916                                 && isASCII(c))
 917                                 continue;
 918                         if (par.isInset(i))
 919                                 break;
 920                         // All characters before c are in the ASCII range, and
 921                         // c is non-ASCII (but no inset), so change the
 922                         // encoding to that required by the language of c.
 923                         // With CJK, only add switch if we have CJK content at the beginning
 924                         // of the paragraph
 925                         if (i != 0 && encoding->package() == Encoding::CJK)
 926                                 continue;
 927
 928                         pair<bool, int> enc_switch = switchEncoding(os.os(),
 929                                                 bparams, runparams, *encoding);
 930                         // the following is necessary after a CJK environment in a multilingual
 931                         // context (nesting issue).
 932                         if (par_language->encoding()->package() == Encoding::CJK
 933                                 && state->open_encoding_ != CJK && state->cjk_inherited_ == 0) {
 934                                 os << "\\begin{CJK}{" << from_ascii(par_language->encoding()->latexName())
 935                                    << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 936                                 state->open_encoding_ = CJK;
 937                         }
 938                         if (encoding->package() != Encoding::none && enc_switch.first) {
 939                                 if (enc_switch.second > 0) {
 940                                         // the '%' is necessary to prevent unwanted whitespace
 941                                         os << "%\n";
 942                                 }
 943                                 // With CJK, the CJK tag had to be closed first (see above)
 944                                 if (runparams.encoding->package() == Encoding::CJK
 945                                     && par_lang != openLanguageName(state)
 946                                     && !par_lang.empty()) {
 947                                         os << from_ascii(subst(
 948                                                 lang_begin_command,
 949                                                 "$$lang",
 950                                                 par_lang))
 951                                         << lang_command_termination;
 952                                         if (using_begin_end)
 953                                                 pushLanguageName(par_lang, localswitch);
 954                                 }
 955                                 runparams.encoding = encoding;
 956                         }
 957                         break;
 958                 }
 959         }
 960
 961         runparams.moving_arg |= style.needprotect;
 962         Encoding const * const prev_encoding = runparams.encoding;
 963
 964         bool const useSetSpace = bparams.documentClass().provides("SetSpace");
 965         if (par.allowParagraphCustomization()) {
 966                 if (par.params().startOfAppendix()) {
 967                         os << "\n\\appendix\n";
 968                 }
 969
 970                 if (!par.params().spacing().isDefault()
 971                         && (pit == 0 || !priorpar->hasSameLayout(par)))
 972                 {
 973                         os << from_ascii(par.params().spacing().writeEnvirBegin(useSetSpace))
 974                             << '\n';
 975                 }
 976
 977                 if (style.isCommand()) {
 978                         os << '\n';
 979                 }
 980         }
 981
 982         parStartCommand(par, os, runparams, style);
 983         Font const outerfont = text.outerFont(pit);
 984
 985         // FIXME UNICODE
 986         os << from_utf8(everypar);
 987         par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 988
 989         Font const font = par.empty()
 990                  ? par.getLayoutFont(bparams, outerfont)
 991                  : par.getFont(bparams, par.size() - 1, outerfont);
 992
 993         bool const is_command = style.isCommand();
 994
 995         if (is_command) {
 996                 os << '}';
 997                 if (!style.postcommandargs().empty())
 998                         latexArgInsets(par, os, runparams, style.postcommandargs(), "post:");
 999                 if (runparams.encoding != prev_encoding) {
1000                         runparams.encoding = prev_encoding;
1001                         os << setEncoding(prev_encoding->iconvName());
1002                 }
1003         }
1004
1005         bool pending_newline = false;
1006         bool unskip_newline = false;
1007         bool close_lang_switch = false;
1008         switch (style.latextype) {
1009         case LATEX_ITEM_ENVIRONMENT:
1010         case LATEX_LIST_ENVIRONMENT:
1011                 if ((nextpar && par_lang != nextpar_lang
1012                              && nextpar->getDepth() == par.getDepth())
1013                     || (atSameLastLangSwitchDepth(state) && nextpar
1014                             && nextpar->getDepth() < par.getDepth()))
1015                         close_lang_switch = using_begin_end;
1016                 if (nextpar && par.params().depth() < nextpar->params().depth())
1017                         pending_newline = true;
1018                 break;
1019         case LATEX_ENVIRONMENT: {
1020                 // if its the last paragraph of the current environment
1021                 // skip it otherwise fall through
1022                 if (nextpar
1023                     && ((nextpar->layout() != par.layout()
1024                            || nextpar->params().depth() != par.params().depth())
1025                         || (!using_begin_end || par_lang != nextpar_lang)))
1026                 {
1027                         close_lang_switch = using_begin_end;
1028                         break;
1029                 }
1030         }
1031         // possible
1032         // fall through
1033         default:
1034                 // we don't need it for the last paragraph!!!
1035                 if (nextpar)
1036                         pending_newline = true;
1037         }
1038
1039         if (par.allowParagraphCustomization()) {
1040                 if (!par.params().spacing().isDefault()
1041                         && (runparams.isLastPar || !nextpar->hasSameLayout(par))) {
1042                         if (pending_newline)
1043                                 os << '\n';
1044
1045                         string const endtag =
1046                                 par.params().spacing().writeEnvirEnd(useSetSpace);
1047                         if (prefixIs(endtag, "\\end{"))
1048                                 os << breakln;
1049
1050                         os << from_ascii(endtag);
1051                         pending_newline = true;
1052                 }
1053         }
1054
1055         // Closing the language is needed for the last paragraph; it is also
1056         // needed if we're within an \L or \R that we may have opened above (not
1057         // necessarily in this paragraph) and are about to close.
1058         bool closing_rtl_ltr_environment = !using_begin_end
1059                 // not for ArabTeX
1060                 && (par_language->lang() != "arabic_arabtex"
1061                     && outer_language->lang() != "arabic_arabtex")
1062                 // have we opened an \L or \R environment?
1063                 && runparams.local_font != 0
1064                 && runparams.local_font->isRightToLeft() != par_language->rightToLeft()
1065                 // are we about to close the language?
1066                 &&((nextpar && par_lang != nextpar_lang)
1067                    || (runparams.isLastPar && par_lang != outer_lang));
1068
1069         if (closing_rtl_ltr_environment
1070             || ((runparams.isLastPar || close_lang_switch)
1071                 && (par_lang != outer_lang || (using_begin_end
1072                                                 && style.isEnvironment()
1073                                                 && par_lang != nextpar_lang)))) {
1074                 // Since \selectlanguage write the language to the aux file,
1075                 // we need to reset the language at the end of footnote or
1076                 // float.
1077
1078                 if (pending_newline || close_lang_switch)
1079                         os << '\n';
1080
1081                 // when the paragraph uses CJK, the language has to be closed earlier
1082                 if (font.language()->encoding()->package() != Encoding::CJK) {
1083                         if (lang_end_command.empty()) {
1084                                 // If this is a child, we should restore the
1085                                 // master language after the last paragraph.
1086                                 Language const * const current_language =
1087                                         (runparams.isLastPar && runparams.master_language)
1088                                                 ? runparams.master_language
1089                                                 : outer_language;
1090                                 string const current_lang = use_polyglossia
1091                                         ? getPolyglossiaEnvName(current_language)
1092                                         : current_language->babel();
1093                                 if (!current_lang.empty()
1094                                     && current_lang != openLanguageName(state)) {
1095                                         string bc = use_polyglossia ?
1096                                                     getPolyglossiaBegin(lang_begin_command, current_lang,
1097                                                                         current_language->polyglossiaOpts())
1098                                                   : subst(lang_begin_command, "$$lang", current_lang);
1099                                         os << bc;
1100                                         pending_newline = !localswitch;
1101                                         unskip_newline = !localswitch;
1102                                         if (using_begin_end)
1103                                                 pushLanguageName(current_lang, localswitch);
1104                                 }
1105                         } else if ((!using_begin_end ||
1106                                     langOpenedAtThisLevel(state)) &&
1107                                    !par_lang.empty()) {
1108                                 // If we are in an environment, we have to
1109                                 // close the "outer" language afterwards
1110                                 string const & cur_lang = openLanguageName(state);
1111                                 if (!style.isEnvironment()
1112                                     || (close_lang_switch
1113                                         && atSameLastLangSwitchDepth(state)
1114                                         && par_lang != outer_lang
1115                                         && (par_lang != cur_lang
1116                                             || (cur_lang != outer_lang
1117                                                 && nextpar
1118                                                 && style != nextpar->layout())))
1119                                     || (atSameLastLangSwitchDepth(state)
1120                                         && state->lang_switch_depth_.size()
1121                                         && cur_lang != par_lang))
1122                                 {
1123                                         if (using_begin_end && !localswitch)
1124                                                 os << breakln;
1125                                         os << from_ascii(subst(
1126                                                 lang_end_command,
1127                                                 "$$lang",
1128                                                 par_lang));
1129                                         pending_newline = !localswitch;
1130                                         unskip_newline = !localswitch;
1131                                         if (using_begin_end)
1132                                                 popLanguageName();
1133                                 }
1134                         }
1135                 }
1136         }
1137         if (closing_rtl_ltr_environment)
1138                 os << "}";
1139
1140         bool const last_was_separator =
1141                 par.size() > 0 && par.isEnvSeparator(par.size() - 1);
1142
1143         if (pending_newline) {
1144                 if (unskip_newline)
1145                         // prevent unwanted whitespace
1146                         os << '%';
1147                 if (!os.afterParbreak() && !last_was_separator)
1148                         os << '\n';
1149         }
1150
1151         // if this is a CJK-paragraph and the next isn't, close CJK
1152         // also if the next paragraph is a multilingual environment (because of nesting)
1153         if (nextpar
1154                 && state->open_encoding_ == CJK
1155                 && (nextpar_language->encoding()->package() != Encoding::CJK
1156                    || (nextpar->layout().isEnvironment() && nextpar->isMultiLingual(bparams)))
1157                 // inbetween environments, CJK has to be closed later (nesting!)
1158                 && (!style.isEnvironment() || !nextpar->layout().isEnvironment())) {
1159                 os << "\\end{CJK}\n";
1160                 state->open_encoding_ = none;
1161         }
1162
1163         // If this is the last paragraph, close the CJK environment
1164         // if necessary. If it's an environment, we'll have to \end that first.
1165         if (runparams.isLastPar && !style.isEnvironment()) {
1166                 switch (state->open_encoding_) {
1167                         case CJK: {
1168                                 // do nothing at the end of child documents
1169                                 if (maintext && buf.masterBuffer() != &buf)
1170                                         break;
1171                                 // end of main text
1172                                 if (maintext) {
1173                                         os << "\n\\end{CJK}\n";
1174                                 // end of an inset
1175                                 } else
1176                                         os << "\\end{CJK}";
1177                                 state->open_encoding_ = none;
1178                                 break;
1179                         }
1180                         case inputenc: {
1181                                 os << "\\egroup";
1182                                 state->open_encoding_ = none;
1183                                 break;
1184                         }
1185                         case none:
1186                         default:
1187                                 // do nothing
1188                                 break;
1189                 }
1190         }
1191
1192         // If this is the last paragraph, and a local_font was set upon entering
1193         // the inset, and we're using "auto" or "default" encoding, and not
1194         // compiling with XeTeX or LuaTeX, the encoding
1195         // should be set back to that local_font's encoding.
1196         if (runparams.isLastPar && runparams_in.local_font != 0
1197             && runparams_in.encoding != runparams_in.local_font->language()->encoding()
1198             && (bparams.inputenc == "auto" || bparams.inputenc == "default")
1199                 && !runparams.isFullUnicode()
1200            ) {
1201                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
1202                 os << setEncoding(runparams_in.encoding->iconvName());
1203         }
1204         // Otherwise, the current encoding should be set for the next paragraph.
1205         else
1206                 runparams_in.encoding = runparams.encoding;
1207
1208
1209         // we don't need a newline for the last paragraph!!!
1210         // Note from JMarc: we will re-add a \n explicitly in
1211         // TeXEnvironment, because it is needed in this case
1212         if (nextpar && !os.afterParbreak() && !last_was_separator) {
1213                 // Make sure to start a new line
1214                 os << breakln;
1215                 Layout const & next_layout = nextpar->layout();
1216                 // A newline '\n' is always output before a command,
1217                 // so avoid doubling it.
1218                 if (!next_layout.isCommand()) {
1219                         // Here we now try to avoid spurious empty lines by
1220                         // outputting a paragraph break only if: (case 1) the
1221                         // paragraph style allows parbreaks and no \begin, \end
1222                         // or \item tags are going to follow (i.e., if the next
1223                         // isn't the first or the current isn't the last
1224                         // paragraph of an environment or itemize) and the
1225                         // depth and alignment of the following paragraph is
1226                         // unchanged, or (case 2) the following is a
1227                         // non-environment paragraph whose depth is increased
1228                         // but whose alignment is unchanged, or (case 3) the
1229                         // paragraph is not an environment and the next one is a
1230                         // non-itemize-like env at lower depth, or (case 4) the
1231                         // paragraph is a command not followed by an environment
1232                         // and the alignment of the current and next paragraph
1233                         // is unchanged, or (case 5) the current alignment is
1234                         // changed and a standard paragraph follows.
1235                         DocumentClass const & tclass = bparams.documentClass();
1236                         if ((style == next_layout
1237                              && !style.parbreak_is_newline
1238                              && !text.inset().getLayout().parbreakIsNewline()
1239                              && style.latextype != LATEX_ITEM_ENVIRONMENT
1240                              && style.latextype != LATEX_LIST_ENVIRONMENT
1241                              && style.align == par.getAlign()
1242                              && nextpar->getDepth() == par.getDepth()
1243                              && nextpar->getAlign() == par.getAlign())
1244                             || (!next_layout.isEnvironment()
1245                                 && nextpar->getDepth() > par.getDepth()
1246                                 && nextpar->getAlign() == par.getAlign())
1247                             || (!style.isEnvironment()
1248                                 && next_layout.latextype == LATEX_ENVIRONMENT
1249                                 && nextpar->getDepth() < par.getDepth())
1250                             || (style.isCommand()
1251                                 && !next_layout.isEnvironment()
1252                                 && style.align == par.getAlign()
1253                                 && next_layout.align == nextpar->getAlign())
1254                             || (style.align != par.getAlign()
1255                                 && tclass.isDefaultLayout(next_layout))) {
1256                                 os << '\n';
1257                         }
1258                 }
1259         }
1260
1261         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " done; ptr "
1262                 << &par << " next " << nextpar);
1263
1264         return;
1265 }
1266
1267
1268 // LaTeX all paragraphs
1269 void latexParagraphs(Buffer const & buf,
1270                      Text const & text,
1271                      otexstream & os,
1272                      OutputParams const & runparams,
1273                      string const & everypar)
1274 {
1275         LASSERT(runparams.par_begin <= runparams.par_end,
1276                 { os << "% LaTeX Output Error\n"; return; } );
1277
1278         BufferParams const & bparams = buf.params();
1279         BufferParams const & mparams = buf.masterParams();
1280
1281         bool const maintext = text.isMainText();
1282         bool const is_child = buf.masterBuffer() != &buf;
1283         bool const multibib_child = maintext && is_child
1284                         && mparams.multibib == "child";
1285
1286         if (multibib_child && mparams.useBiblatex())
1287                 os << "\\newrefsection";
1288         else if (multibib_child && mparams.useBibtopic()) {
1289                 os << "\\begin{btUnit}\n";
1290                 runparams.openbtUnit = true;
1291         }
1292
1293         // Open a CJK environment at the beginning of the main buffer
1294         // if the document's language is a CJK language
1295         // (but not in child documents)
1296         OutputState * state = getOutputState();
1297         if (maintext && !is_child
1298             && bparams.encoding().package() == Encoding::CJK) {
1299                 os << "\\begin{CJK}{" << from_ascii(bparams.encoding().latexName())
1300                 << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
1301                 state->open_encoding_ = CJK;
1302         }
1303         // if "auto begin" is switched off, explicitly switch the
1304         // language on at start
1305         string const mainlang = runparams.use_polyglossia
1306                 ? getPolyglossiaEnvName(bparams.language)
1307                 : bparams.language->babel();
1308         string const lang_begin_command = runparams.use_polyglossia ?
1309                 "\\begin{$$lang}$$opts" : lyxrc.language_command_begin;
1310         string const lang_end_command = runparams.use_polyglossia ?
1311                 "\\end{$$lang}" : lyxrc.language_command_end;
1312         bool const using_begin_end = runparams.use_polyglossia ||
1313                                         !lang_end_command.empty();
1314
1315         if (maintext && !lyxrc.language_auto_begin &&
1316             !mainlang.empty()) {
1317                 // FIXME UNICODE
1318                 string bc = runparams.use_polyglossia ?
1319                             getPolyglossiaBegin(lang_begin_command, mainlang,
1320                                                 bparams.language->polyglossiaOpts())
1321                           : subst(lang_begin_command, "$$lang", mainlang);
1322                 os << bc;
1323                 os << '\n';
1324                 if (using_begin_end)
1325                         pushLanguageName(mainlang);
1326         }
1327
1328         ParagraphList const & paragraphs = text.paragraphs();
1329
1330         if (runparams.par_begin == runparams.par_end) {
1331                 // The full doc will be exported but it is easier to just rely on
1332                 // runparams range parameters that will be passed TeXEnvironment.
1333                 runparams.par_begin = 0;
1334                 runparams.par_end = paragraphs.size();
1335         }
1336
1337         pit_type pit = runparams.par_begin;
1338         // lastpit is for the language check after the loop.
1339         pit_type lastpit = pit;
1340         // variables used in the loop:
1341         bool was_title = false;
1342         bool already_title = false;
1343         DocumentClass const & tclass = bparams.documentClass();
1344
1345         // Did we already warn about inTitle layout mixing? (we only warn once)
1346         bool gave_layout_warning = false;
1347         for (; pit < runparams.par_end; ++pit) {
1348                 lastpit = pit;
1349                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
1350
1351                 // FIXME This check should not be needed. We should
1352                 // perhaps issue an error if it is.
1353                 Layout const & layout = text.inset().forcePlainLayout() ?
1354                                 tclass.plainLayout() : par->layout();
1355
1356                 if (layout.intitle) {
1357                         if (already_title) {
1358                                 if (!gave_layout_warning && !runparams.dryrun) {
1359                                         gave_layout_warning = true;
1360                                         frontend::Alert::warning(_("Error in latexParagraphs"),
1361                                                         bformat(_("You are using at least one "
1362                                                           "layout (%1$s) intended for the title, "
1363                                                           "after using non-title layouts. This "
1364                                                           "could lead to missing or incorrect output."
1365                                                           ), layout.name()));
1366                                 }
1367                         } else if (!was_title) {
1368                                 was_title = true;
1369                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1370                                         os << "\\begin{"
1371                                                         << from_ascii(tclass.titlename())
1372                                                         << "}\n";
1373                                 }
1374                         }
1375                 } else if (was_title && !already_title && !layout.inpreamble) {
1376                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
1377                                 os << "\\end{" << from_ascii(tclass.titlename())
1378                                                 << "}\n";
1379                         }
1380                         else {
1381                                 os << "\\" << from_ascii(tclass.titlename())
1382                                                 << "\n";
1383                         }
1384                         already_title = true;
1385                         was_title = false;
1386                 }
1387
1388                 if (layout.isCommand() && !layout.latexname().empty()
1389                     && layout.latexname() == bparams.multibib) {
1390                         if (runparams.openbtUnit)
1391                                 os << "\\end{btUnit}\n";
1392                         if (!bparams.useBiblatex()) {
1393                                 os << '\n' << "\\begin{btUnit}\n";
1394                                 runparams.openbtUnit = true;
1395                         }
1396                 }
1397
1398                 if (!layout.isEnvironment() && par->params().leftIndent().zero()) {
1399                         // This is a standard top level paragraph, TeX it and continue.
1400                         TeXOnePar(buf, text, pit, os, runparams, everypar);
1401                         continue;
1402                 }
1403
1404                 TeXEnvironmentData const data =
1405                         prepareEnvironment(buf, text, par, os, runparams);
1406                 // pit can be changed in TeXEnvironment.
1407                 TeXEnvironment(buf, text, runparams, pit, os);
1408                 finishEnvironment(os, runparams, data);
1409         }
1410
1411         if (pit == runparams.par_end) {
1412                         // Make sure that the last paragraph is
1413                         // correctly terminated (because TeXOnePar does
1414                         // not add a \n in this case)
1415                         //os << '\n';
1416         }
1417
1418         // It might be that we only have a title in this document
1419         if (was_title && !already_title) {
1420                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1421                         os << "\\end{" << from_ascii(tclass.titlename())
1422                            << "}\n";
1423                 } else {
1424                         os << "\\" << from_ascii(tclass.titlename())
1425                            << "\n";
1426                 }
1427         }
1428
1429         if (maintext && !is_child && runparams.openbtUnit)
1430                 os << "\\end{btUnit}\n";
1431
1432         // if "auto end" is switched off, explicitly close the language at the end
1433         // but only if the last par is in a babel or polyglossia language
1434         if (maintext && !lyxrc.language_auto_end && !mainlang.empty() &&
1435                 paragraphs.at(lastpit).getParLanguage(bparams)->encoding()->package() != Encoding::CJK) {
1436                 os << from_utf8(subst(lang_end_command,
1437                                         "$$lang",
1438                                         mainlang))
1439                         << '\n';
1440                 if (using_begin_end)
1441                         popLanguageName();
1442         }
1443
1444         // If the last paragraph is an environment, we'll have to close
1445         // CJK at the very end to do proper nesting.
1446         if (maintext && !is_child && state->open_encoding_ == CJK) {
1447                 os << "\\end{CJK}\n";
1448                 state->open_encoding_ = none;
1449         }
1450         // Likewise for polyglossia or when using begin/end commands
1451         string const & cur_lang = openLanguageName(state);
1452         if (maintext && !is_child && !cur_lang.empty()) {
1453                 os << from_utf8(subst(lang_end_command,
1454                                         "$$lang",
1455                                         cur_lang))
1456                    << '\n';
1457                 if (using_begin_end)
1458                         popLanguageName();
1459         }
1460
1461         // reset inherited encoding
1462         if (state->cjk_inherited_ > 0) {
1463                 state->cjk_inherited_ -= 1;
1464                 if (state->cjk_inherited_ == 0)
1465                         state->open_encoding_ = CJK;
1466         }
1467
1468         if (multibib_child && mparams.useBibtopic()) {
1469                 os << "\\end{btUnit}\n";
1470                 runparams.openbtUnit = false;
1471         }
1472 }
1473
1474
1475 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
1476                    OutputParams const & runparams, Encoding const & newEnc,
1477                    bool force)
1478 {
1479         // XeTeX/LuaTeX use only one encoding per document:
1480         // * with useNonTeXFonts: "utf8plain",
1481         // * with XeTeX and TeX fonts: "ascii" (inputenc fails),
1482         // * with LuaTeX and TeX fonts: only one encoding accepted by luainputenc.
1483         if (runparams.isFullUnicode())
1484                 return make_pair(false, 0);
1485
1486         Encoding const & oldEnc = *runparams.encoding;
1487         bool moving_arg = runparams.moving_arg;
1488         // If we switch from/to CJK, we need to switch anyway, despite custom inputenc
1489         bool const from_to_cjk =
1490                 (oldEnc.package() == Encoding::CJK && newEnc.package() != Encoding::CJK)
1491                 || (oldEnc.package() != Encoding::CJK && newEnc.package() == Encoding::CJK);
1492         if (!force && !from_to_cjk
1493             && ((bparams.inputenc != "auto" && bparams.inputenc != "default") || moving_arg))
1494                 return make_pair(false, 0);
1495
1496         // Do nothing if the encoding is unchanged.
1497         if (oldEnc.name() == newEnc.name())
1498                 return make_pair(false, 0);
1499
1500         // FIXME We ignore encoding switches from/to encodings that do
1501         // neither support the inputenc package nor the CJK package here.
1502         // This does of course only work in special cases (e.g. switch from
1503         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
1504         // but it is the best we can do
1505         if (oldEnc.package() == Encoding::none
1506                 || newEnc.package() == Encoding::none)
1507                 return make_pair(false, 0);
1508
1509         LYXERR(Debug::LATEX, "Changing LaTeX encoding from "
1510                 << oldEnc.name() << " to " << newEnc.name());
1511         os << setEncoding(newEnc.iconvName());
1512         if (bparams.inputenc == "default")
1513                 return make_pair(true, 0);
1514
1515         docstring const inputenc_arg(from_ascii(newEnc.latexName()));
1516         OutputState * state = getOutputState();
1517         switch (newEnc.package()) {
1518                 case Encoding::none:
1519                 case Encoding::japanese:
1520                         // shouldn't ever reach here, see above
1521                         return make_pair(true, 0);
1522                 case Encoding::inputenc: {
1523                         int count = inputenc_arg.length();
1524                         if (oldEnc.package() == Encoding::CJK &&
1525                             state->open_encoding_ == CJK) {
1526                                 os << "\\end{CJK}";
1527                                 state->open_encoding_ = none;
1528                                 count += 9;
1529                         }
1530                         else if (oldEnc.package() == Encoding::inputenc &&
1531                                  state->open_encoding_ == inputenc) {
1532                                 os << "\\egroup";
1533                                 state->open_encoding_ = none;
1534                                 count += 7;
1535                         }
1536                         if (runparams.local_font != 0
1537                             &&  oldEnc.package() == Encoding::CJK) {
1538                                 // within insets, \inputenc switches need
1539                                 // to be embraced within \bgroup...\egroup;
1540                                 // else CJK fails.
1541                                 os << "\\bgroup";
1542                                 count += 7;
1543                                 state->open_encoding_ = inputenc;
1544                         }
1545                         // with the japanese option, inputenc is omitted.
1546                         if (runparams.use_japanese)
1547                                 return make_pair(true, count);
1548                         os << "\\inputencoding{" << inputenc_arg << '}';
1549                         return make_pair(true, count + 16);
1550                 }
1551                 case Encoding::CJK: {
1552                         int count = inputenc_arg.length();
1553                         if (oldEnc.package() == Encoding::CJK &&
1554                             state->open_encoding_ == CJK) {
1555                                 os << "\\end{CJK}";
1556                                 count += 9;
1557                         }
1558                         if (oldEnc.package() == Encoding::inputenc &&
1559                             state->open_encoding_ == inputenc) {
1560                                 os << "\\egroup";
1561                                 count += 7;
1562                         }
1563                         os << "\\begin{CJK}{" << inputenc_arg << "}{"
1564                            << from_ascii(bparams.fonts_cjk) << "}";
1565                         state->open_encoding_ = CJK;
1566                         return make_pair(true, count + 15);
1567                 }
1568         }
1569         // Dead code to avoid a warning:
1570         return make_pair(true, 0);
1571
1572 }
1573
1574 } // namespace lyx