src/output_latex.cpp

   1 /**
   2  * \file output_latex.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars Gullik Bjønnes
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "output_latex.h"
  14
  15 #include "Buffer.h"
  16 #include "BufferParams.h"
  17 #include "Encoding.h"
  18 #include "Font.h"
  19 #include "InsetList.h"
  20 #include "Language.h"
  21 #include "Layout.h"
  22 #include "LyXRC.h"
  23 #include "OutputParams.h"
  24 #include "Paragraph.h"
  25 #include "ParagraphParameters.h"
  26 #include "TextClass.h"
  27 #include "TexRow.h"
  28
  29 #include "insets/InsetBibitem.h"
  30 #include "insets/InsetArgument.h"
  31
  32 #include "support/lassert.h"
  33 #include "support/convert.h"
  34 #include "support/debug.h"
  35 #include "support/lstrings.h"
  36 #include "support/lyxalgo.h"
  37 #include "support/textutils.h"
  38
  39 #include <QThreadStorage>
  40
  41 #include <list>
  42
  43 using namespace std;
  44 using namespace lyx::support;
  45
  46
  47 namespace lyx {
  48
  49 namespace {
  50
  51 enum OpenEncoding {
  52         none,
  53         inputenc,
  54         CJK
  55 };
  56
  57
  58 struct OutputState
  59 {
  60         OutputState() : open_encoding_(none), cjk_inherited_(0),
  61                         prev_env_language_(0), open_polyglossia_lang_("")
  62         {
  63         }
  64         int open_encoding_;
  65         int cjk_inherited_;
  66         Language const * prev_env_language_;
  67         string open_polyglossia_lang_;
  68 };
  69
  70
  71 OutputState * getOutputState()
  72 {
  73         // FIXME An instance of OutputState should be kept around for each export
  74         //       instead of using local thread storage
  75         static QThreadStorage<OutputState *> outputstate;
  76         if (!outputstate.hasLocalData())
  77                 outputstate.setLocalData(new OutputState);
  78         return outputstate.localData();
  79 }
  80
  81
  82 string const getPolyglossiaEnvName(Language const * lang)
  83 {
  84         string result = lang->polyglossia();
  85         if (result == "arabic")
  86                 // exceptional spelling; see polyglossia docs.
  87                 result = "Arabic";
  88         return result;
  89 }
  90
  91
  92 string const getPolyglossiaBegin(string const & lang_begin_command,
  93                                  string const & lang, string const & opts)
  94 {
  95         string result;
  96         if (!lang.empty())
  97                 result = subst(lang_begin_command, "$$lang", lang);
  98         string options = opts.empty() ?
  99                     string() : "[" + opts + "]";
 100         result = subst(result, "$$opts", options);
 101
 102         return result;
 103 }
 104
 105
 106 struct TeXEnvironmentData
 107 {
 108         bool cjk_nested;
 109         Layout const * style;
 110         Language const * par_language;
 111         Encoding const * prev_encoding;
 112         bool leftindent_open;
 113 };
 114
 115
 116 static TeXEnvironmentData prepareEnvironment(Buffer const & buf,
 117                                         Text const & text,
 118                                         ParagraphList::const_iterator pit,
 119                                         otexstream & os,
 120                                         OutputParams const & runparams)
 121 {
 122         TeXEnvironmentData data;
 123
 124         BufferParams const & bparams = buf.params();
 125
 126         // FIXME This test should not be necessary.
 127         // We should perhaps issue an error if it is.
 128         Layout const & style = text.inset().forcePlainLayout() ?
 129                 bparams.documentClass().plainLayout() : pit->layout();
 130
 131         ParagraphList const & paragraphs = text.paragraphs();
 132         ParagraphList::const_iterator const priorpit =
 133                 pit == paragraphs.begin() ? pit : prev(pit, 1);
 134
 135         OutputState * state = getOutputState();
 136         bool const use_prev_env_language = state->prev_env_language_ != 0
 137                         && priorpit->layout().isEnvironment()
 138                         && (priorpit->getDepth() > pit->getDepth()
 139                             || (priorpit->getDepth() == pit->getDepth()
 140                                 && priorpit->layout() != pit->layout()));
 141
 142         data.prev_encoding = runparams.encoding;
 143         data.par_language = pit->getParLanguage(bparams);
 144         Language const * const doc_language = bparams.language;
 145         Language const * const prev_par_language =
 146                 (pit != paragraphs.begin())
 147                 ? (use_prev_env_language ? state->prev_env_language_
 148                                          : priorpit->getParLanguage(bparams))
 149                 : doc_language;
 150
 151         bool const use_polyglossia = runparams.use_polyglossia;
 152         string const par_lang = use_polyglossia ?
 153                 getPolyglossiaEnvName(data.par_language) : data.par_language->babel();
 154         string const prev_par_lang = use_polyglossia ?
 155                 getPolyglossiaEnvName(prev_par_language) : prev_par_language->babel();
 156         string const doc_lang = use_polyglossia ?
 157                 getPolyglossiaEnvName(doc_language) : doc_language->babel();
 158         string const lang_begin_command = use_polyglossia ?
 159                 "\\begin{$$lang}" : lyxrc.language_command_begin;
 160         string const lang_end_command = use_polyglossia ?
 161                 "\\end{$$lang}" : lyxrc.language_command_end;
 162
 163         if (par_lang != prev_par_lang) {
 164                 if (!lang_end_command.empty() &&
 165                     prev_par_lang != doc_lang &&
 166                     !prev_par_lang.empty()) {
 167                         os << from_ascii(subst(
 168                                 lang_end_command,
 169                                 "$$lang",
 170                                 prev_par_lang))
 171                           // the '%' is necessary to prevent unwanted whitespace
 172                           << "%\n";
 173                 }
 174
 175                 if ((lang_end_command.empty() ||
 176                     par_lang != doc_lang) &&
 177                     !par_lang.empty()) {
 178                             string bc = use_polyglossia ?
 179                                         getPolyglossiaBegin(lang_begin_command, par_lang,
 180                                                             data.par_language->polyglossiaOpts())
 181                                       : subst(lang_begin_command, "$$lang", par_lang);
 182                             os << bc;
 183                             // the '%' is necessary to prevent unwanted whitespace
 184                             os << "%\n";
 185                 }
 186         }
 187
 188         data.leftindent_open = false;
 189         if (!pit->params().leftIndent().zero()) {
 190                 os << "\\begin{LyXParagraphLeftIndent}{"
 191                    << from_ascii(pit->params().leftIndent().asLatexString())
 192                    << "}\n";
 193                 data.leftindent_open = true;
 194         }
 195
 196         if (style.isEnvironment()) {
 197                 if (par_lang != doc_lang)
 198                         state->open_polyglossia_lang_ = par_lang;
 199                 os << "\\begin{" << from_ascii(style.latexname()) << '}';
 200                 if (!style.latexargs().empty()) {
 201                         OutputParams rp = runparams;
 202                         rp.local_font = &pit->getFirstFontSettings(bparams);
 203                         latexArgInsets(paragraphs, pit, os, rp, style.latexargs());
 204                 }
 205                 if (style.latextype == LATEX_LIST_ENVIRONMENT) {
 206                         os << '{'
 207                            << pit->params().labelWidthString()
 208                            << "}\n";
 209                 } else if (style.labeltype == LABEL_BIBLIO) {
 210                         if (pit->params().labelWidthString().empty())
 211                                 os << '{' << bibitemWidest(buf, runparams) << "}\n";
 212                         else
 213                                 os << '{'
 214                                   << pit->params().labelWidthString()
 215                                   << "}\n";
 216                 } else
 217                         os << from_ascii(style.latexparam()) << '\n';
 218         }
 219         data.style = &style;
 220
 221         // in multilingual environments, the CJK tags have to be nested properly
 222         data.cjk_nested = false;
 223         if (data.par_language->encoding()->package() == Encoding::CJK &&
 224             state->open_encoding_ != CJK && pit->isMultiLingual(bparams)) {
 225                 if (prev_par_language->encoding()->package() == Encoding::CJK)
 226                         os << "\\begin{CJK}{" << from_ascii(data.par_language->encoding()->latexName())
 227                            << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 228                 state->open_encoding_ = CJK;
 229                 data.cjk_nested = true;
 230         }
 231         return data;
 232 }
 233
 234
 235 static void finishEnvironment(otexstream & os, OutputParams const & runparams,
 236                               TeXEnvironmentData const & data)
 237 {
 238         OutputState * state = getOutputState();
 239         if (state->open_encoding_ == CJK && data.cjk_nested) {
 240                 // We need to close the encoding even if it does not change
 241                 // to do correct environment nesting
 242                 os << "\\end{CJK}\n";
 243                 state->open_encoding_ = none;
 244         }
 245
 246         if (data.style->isEnvironment()) {
 247                 os << breakln
 248                    << "\\end{" << from_ascii(data.style->latexname()) << "}\n";
 249                 state->prev_env_language_ = data.par_language;
 250                 if (runparams.encoding != data.prev_encoding) {
 251                         runparams.encoding = data.prev_encoding;
 252                         if (!runparams.isFullUnicode())
 253                                 os << setEncoding(data.prev_encoding->iconvName());
 254                 }
 255         }
 256
 257         if (data.leftindent_open) {
 258                 os << breakln << "\\end{LyXParagraphLeftIndent}\n";
 259                 state->prev_env_language_ = data.par_language;
 260                 if (runparams.encoding != data.prev_encoding) {
 261                         runparams.encoding = data.prev_encoding;
 262                         if (!runparams.isFullUnicode())
 263                                 os << setEncoding(data.prev_encoding->iconvName());
 264                 }
 265         }
 266
 267         // Check whether we should output a blank line after the environment
 268         if (!data.style->nextnoindent)
 269                 os << '\n';
 270 }
 271
 272
 273 void TeXEnvironment(Buffer const & buf, Text const & text,
 274                     OutputParams const & runparams,
 275                     pit_type & pit, otexstream & os)
 276 {
 277         ParagraphList const & paragraphs = text.paragraphs();
 278         ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 279         LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << pit);
 280
 281         Layout const & current_layout = par->layout();
 282         depth_type const current_depth = par->params().depth();
 283         Length const & current_left_indent = par->params().leftIndent();
 284
 285         // This is for debugging purpose at the end.
 286         pit_type const par_begin = pit;
 287         for (; pit < runparams.par_end; ++pit) {
 288                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 289
 290                 // check first if this is an higher depth paragraph.
 291                 bool go_out = (par->params().depth() < current_depth);
 292                 if (par->params().depth() == current_depth) {
 293                         // This environment is finished.
 294                         go_out |= (par->layout() != current_layout);
 295                         go_out |= (par->params().leftIndent() != current_left_indent);
 296                 }
 297                 if (go_out) {
 298                         // nothing to do here, restore pit and go out.
 299                         pit--;
 300                         break;
 301                 }
 302
 303                 if (par->layout() == current_layout
 304                         && par->params().depth() == current_depth
 305                         && par->params().leftIndent() == current_left_indent) {
 306                         // We are still in the same environment so TeXOnePar and continue;
 307                         TeXOnePar(buf, text, pit, os, runparams);
 308                         continue;
 309                 }
 310
 311                 // We are now in a deeper environment.
 312                 // Either par->layout() != current_layout
 313                 // Or     par->params().depth() > current_depth
 314                 // Or     par->params().leftIndent() != current_left_indent)
 315
 316                 // FIXME This test should not be necessary.
 317                 // We should perhaps issue an error if it is.
 318                 bool const force_plain_layout = text.inset().forcePlainLayout();
 319                 Layout const & style = force_plain_layout
 320                         ? buf.params().documentClass().plainLayout()
 321                         : par->layout();
 322
 323                 if (!style.isEnvironment()) {
 324                         // This is a standard paragraph, no need to call TeXEnvironment.
 325                         TeXOnePar(buf, text, pit, os, runparams);
 326                         continue;
 327                 }
 328
 329                 // This is a new environment.
 330                 TeXEnvironmentData const data =
 331                         prepareEnvironment(buf, text, par, os, runparams);
 332                 // Recursive call to TeXEnvironment!
 333                 TeXEnvironment(buf, text, runparams, pit, os);
 334                 finishEnvironment(os, runparams, data);
 335         }
 336
 337         if (pit != runparams.par_end)
 338                 LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << par_begin << " done.");
 339 }
 340
 341
 342 void getArgInsets(otexstream & os, OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs,
 343                   map<int, lyx::InsetArgument const *> ilist, vector<string> required, string const & prefix)
 344 {
 345         unsigned int const argnr = latexargs.size();
 346         if (argnr == 0)
 347                 return;
 348
 349         // Default and preset args are always output, so if they require
 350         // other arguments, consider this.
 351         Layout::LaTeXArgMap::const_iterator lit = latexargs.begin();
 352         Layout::LaTeXArgMap::const_iterator const lend = latexargs.end();
 353         for (; lit != lend; ++lit) {
 354                 Layout::latexarg arg = (*lit).second;
 355                 if ((!arg.presetarg.empty() || !arg.defaultarg.empty()) && !arg.requires.empty()) {
 356                                 vector<string> req = getVectorFromString(arg.requires);
 357                                 required.insert(required.end(), req.begin(), req.end());
 358                         }
 359         }
 360
 361         for (unsigned int i = 1; i <= argnr; ++i) {
 362                 map<int, InsetArgument const *>::const_iterator lit = ilist.find(i);
 363                 bool inserted = false;
 364                 if (lit != ilist.end()) {
 365                         InsetArgument const * ins = (*lit).second;
 366                         if (ins) {
 367                                 Layout::LaTeXArgMap::const_iterator const lait =
 368                                                 latexargs.find(ins->name());
 369                                 if (lait != latexargs.end()) {
 370                                         Layout::latexarg arg = (*lait).second;
 371                                         docstring ldelim = arg.mandatory ?
 372                                                         from_ascii("{") : from_ascii("[");
 373                                         docstring rdelim = arg.mandatory ?
 374                                                         from_ascii("}") : from_ascii("]");
 375                                         if (!arg.ldelim.empty())
 376                                                 ldelim = arg.ldelim;
 377                                         if (!arg.rdelim.empty())
 378                                                 rdelim = arg.rdelim;
 379                                         ins->latexArgument(os, runparams, ldelim, rdelim, arg.presetarg);
 380                                         inserted = true;
 381                                 }
 382                         }
 383                 }
 384                 if (!inserted) {
 385                         Layout::LaTeXArgMap::const_iterator lait = latexargs.begin();
 386                         Layout::LaTeXArgMap::const_iterator const laend = latexargs.end();
 387                         for (; lait != laend; ++lait) {
 388                                 string const name = prefix + convert<string>(i);
 389                                 if ((*lait).first == name) {
 390                                         Layout::latexarg arg = (*lait).second;
 391                                         docstring preset = arg.presetarg;
 392                                         if (!arg.defaultarg.empty()) {
 393                                                 if (!preset.empty())
 394                                                         preset += ",";
 395                                                 preset += arg.defaultarg;
 396                                         }
 397                                         if (arg.mandatory) {
 398                                                 docstring ldelim = arg.ldelim.empty() ?
 399                                                                 from_ascii("{") : arg.ldelim;
 400                                                 docstring rdelim = arg.rdelim.empty() ?
 401                                                                 from_ascii("}") : arg.rdelim;
 402                                                 os << ldelim << preset << rdelim;
 403                                         } else if (!preset.empty()) {
 404                                                 docstring ldelim = arg.ldelim.empty() ?
 405                                                                 from_ascii("[") : arg.ldelim;
 406                                                 docstring rdelim = arg.rdelim.empty() ?
 407                                                                 from_ascii("]") : arg.rdelim;
 408                                                 os << ldelim << preset << rdelim;
 409                                         } else if (find(required.begin(), required.end(),
 410                                                    (*lait).first) != required.end()) {
 411                                                 docstring ldelim = arg.ldelim.empty() ?
 412                                                                 from_ascii("[") : arg.ldelim;
 413                                                 docstring rdelim = arg.rdelim.empty() ?
 414                                                                 from_ascii("]") : arg.rdelim;
 415                                                 os << ldelim << rdelim;
 416                                         } else
 417                                                 break;
 418                                 }
 419                         }
 420                 }
 421         }
 422 }
 423
 424
 425 } // namespace anon
 426
 427
 428 void latexArgInsets(Paragraph const & par, otexstream & os,
 429         OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs, string const & prefix)
 430 {
 431         map<int, InsetArgument const *> ilist;
 432         vector<string> required;
 433
 434         InsetList::const_iterator it = par.insetList().begin();
 435         InsetList::const_iterator end = par.insetList().end();
 436         for (; it != end; ++it) {
 437                 if (it->inset->lyxCode() == ARG_CODE) {
 438                         InsetArgument const * ins =
 439                                 static_cast<InsetArgument const *>(it->inset);
 440                         if (ins->name().empty())
 441                                 LYXERR0("Error: Unnamed argument inset!");
 442                         else {
 443                                 string const name = prefix.empty() ? ins->name() : split(ins->name(), ':');
 444                                 unsigned int const nr = convert<unsigned int>(name);
 445                                 ilist[nr] = ins;
 446                                 Layout::LaTeXArgMap::const_iterator const lit =
 447                                                 latexargs.find(ins->name());
 448                                 if (lit != latexargs.end()) {
 449                                         Layout::latexarg const & arg = (*lit).second;
 450                                         if (!arg.requires.empty()) {
 451                                                 vector<string> req = getVectorFromString(arg.requires);
 452                                                 required.insert(required.end(), req.begin(), req.end());
 453                                         }
 454                                 }
 455                         }
 456                 }
 457         }
 458         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 459 }
 460
 461
 462 void latexArgInsets(ParagraphList const & pars, ParagraphList::const_iterator pit,
 463         otexstream & os, OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs,
 464         string const & prefix)
 465 {
 466         map<int, InsetArgument const *> ilist;
 467         vector<string> required;
 468
 469         depth_type const current_depth = pit->params().depth();
 470         Layout const current_layout = pit->layout();
 471
 472         // get the first paragraph in sequence with this layout and depth
 473         pit_type offset = 0;
 474         while (true) {
 475                 if (prev(pit, offset) == pars.begin())
 476                         break;
 477                 ParagraphList::const_iterator priorpit = prev(pit, offset + 1);
 478                 if (priorpit->layout() == current_layout
 479                     && priorpit->params().depth() == current_depth)
 480                         ++offset;
 481                 else
 482                         break;
 483         }
 484
 485         ParagraphList::const_iterator spit = prev(pit, offset);
 486
 487         for (; spit != pars.end(); ++spit) {
 488                 if (spit->layout() != current_layout || spit->params().depth() < current_depth)
 489                         break;
 490                 if (spit->params().depth() > current_depth)
 491                         continue;
 492                 InsetList::const_iterator it = spit->insetList().begin();
 493                 InsetList::const_iterator end = spit->insetList().end();
 494                 for (; it != end; ++it) {
 495                         if (it->inset->lyxCode() == ARG_CODE) {
 496                                 InsetArgument const * ins =
 497                                         static_cast<InsetArgument const *>(it->inset);
 498                                 if (ins->name().empty())
 499                                         LYXERR0("Error: Unnamed argument inset!");
 500                                 else {
 501                                         string const name = prefix.empty() ? ins->name() : split(ins->name(), ':');
 502                                         unsigned int const nr = convert<unsigned int>(name);
 503                                         if (ilist.find(nr) == ilist.end())
 504                                                 ilist[nr] = ins;
 505                                         Layout::LaTeXArgMap::const_iterator const lit =
 506                                                         latexargs.find(ins->name());
 507                                         if (lit != latexargs.end()) {
 508                                                 Layout::latexarg const & arg = (*lit).second;
 509                                                 if (!arg.requires.empty()) {
 510                                                         vector<string> req = getVectorFromString(arg.requires);
 511                                                         required.insert(required.end(), req.begin(), req.end());
 512                                                 }
 513                                         }
 514                                 }
 515                         }
 516                 }
 517         }
 518         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 519 }
 520
 521 namespace {
 522
 523 // output the proper paragraph start according to latextype.
 524 void parStartCommand(Paragraph const & par, otexstream & os,
 525                      OutputParams const & runparams, Layout const & style)
 526 {
 527         switch (style.latextype) {
 528         case LATEX_COMMAND:
 529                 os << '\\' << from_ascii(style.latexname());
 530
 531                 // Command arguments
 532                 if (!style.latexargs().empty())
 533                         latexArgInsets(par, os, runparams, style.latexargs());
 534                 os << from_ascii(style.latexparam());
 535                 break;
 536         case LATEX_ITEM_ENVIRONMENT:
 537         case LATEX_LIST_ENVIRONMENT:
 538                 os << "\\" + style.itemcommand();
 539                 // Item arguments
 540                 if (!style.itemargs().empty())
 541                         latexArgInsets(par, os, runparams, style.itemargs(), "item:");
 542                 os << " ";
 543                 break;
 544         case LATEX_BIB_ENVIRONMENT:
 545                 // ignore this, the inset will write itself
 546                 break;
 547         default:
 548                 break;
 549         }
 550 }
 551
 552 } // namespace anon
 553
 554 // FIXME: this should be anonymous
 555 void TeXOnePar(Buffer const & buf,
 556                Text const & text,
 557                pit_type pit,
 558                otexstream & os,
 559                OutputParams const & runparams_in,
 560                string const & everypar,
 561                int start_pos, int end_pos)
 562 {
 563         BufferParams const & bparams = runparams_in.is_child
 564                 ? buf.masterParams() : buf.params();
 565         ParagraphList const & paragraphs = text.paragraphs();
 566         Paragraph const & par = paragraphs.at(pit);
 567         // FIXME This check should not really be needed.
 568         // Perhaps we should issue an error if it is.
 569         Layout const & style = text.inset().forcePlainLayout() ?
 570                 bparams.documentClass().plainLayout() : par.layout();
 571
 572         if (style.inpreamble)
 573                 return;
 574
 575         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " ptr " << &par << " '"
 576                 << everypar << "'");
 577
 578         OutputParams runparams = runparams_in;
 579         runparams.isLastPar = (pit == pit_type(paragraphs.size() - 1));
 580         // We reinitialze par begin and end to be on the safe side
 581         // with embedded inset as we don't know if they set those
 582         // value correctly.
 583         runparams.par_begin = 0;
 584         runparams.par_end = 0;
 585
 586         bool const maintext = text.isMainText();
 587         // we are at the beginning of an inset and CJK is already open;
 588         // we count inheritation levels to get the inset nesting right.
 589         OutputState * state = getOutputState();
 590         if (pit == 0 && !maintext
 591             && (state->cjk_inherited_ > 0 || state->open_encoding_ == CJK)) {
 592                 state->cjk_inherited_ += 1;
 593                 state->open_encoding_ = none;
 594         }
 595
 596         if (text.inset().isPassThru()) {
 597                 Font const outerfont = text.outerFont(pit);
 598
 599                 // No newline before first paragraph in this lyxtext
 600                 if (pit > 0) {
 601                         os << '\n';
 602                         if (!text.inset().getLayout().parbreakIsNewline())
 603                                 os << '\n';
 604                 }
 605
 606                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 607                 return;
 608         }
 609
 610         Paragraph const * nextpar = runparams.isLastPar
 611                 ? 0 : &paragraphs.at(pit + 1);
 612
 613         if (style.pass_thru) {
 614                 Font const outerfont = text.outerFont(pit);
 615                 parStartCommand(par, os, runparams, style);
 616
 617                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 618
 619                 // I did not create a parEndCommand for this minuscule
 620                 // task because in the other user of parStartCommand
 621                 // the code is different (JMarc)
 622                 if (style.isCommand())
 623                         os << "}\n";
 624                 else
 625                         os << '\n';
 626                 if (!style.parbreak_is_newline) {
 627                         os << '\n';
 628                 } else if (nextpar && !style.isEnvironment()) {
 629                         Layout const nextstyle = text.inset().forcePlainLayout()
 630                                 ? bparams.documentClass().plainLayout()
 631                                 : nextpar->layout();
 632                         if (nextstyle.name() != style.name())
 633                                 os << '\n';
 634                 }
 635
 636                 return;
 637         }
 638
 639         // This paragraph's language
 640         Language const * const par_language = par.getParLanguage(bparams);
 641         // The document's language
 642         Language const * const doc_language = bparams.language;
 643         // The language that was in effect when the environment this paragraph is
 644         // inside of was opened
 645         Language const * const outer_language =
 646                 (runparams.local_font != 0) ?
 647                         runparams.local_font->language() : doc_language;
 648
 649         Paragraph const * priorpar = (pit == 0) ? 0 : &paragraphs.at(pit - 1);
 650
 651         // The previous language that was in effect is the language of the
 652         // previous paragraph, unless the previous paragraph is inside an
 653         // environment with nesting depth greater than (or equal to, but with
 654         // a different layout) the current one. If there is no previous
 655         // paragraph, the previous language is the outer language.
 656         bool const use_prev_env_language = state->prev_env_language_ != 0
 657                         && priorpar
 658                         && priorpar->layout().isEnvironment()
 659                         && (priorpar->getDepth() > par.getDepth()
 660                             || (priorpar->getDepth() == par.getDepth()
 661                                     && priorpar->layout() != par.layout()));
 662         Language const * const prev_language =
 663                 (pit != 0)
 664                 ? (use_prev_env_language ? state->prev_env_language_
 665                                          : priorpar->getParLanguage(bparams))
 666                 : outer_language;
 667
 668
 669         bool const use_polyglossia = runparams.use_polyglossia;
 670         string const par_lang = use_polyglossia ?
 671                 getPolyglossiaEnvName(par_language): par_language->babel();
 672         string const prev_lang = use_polyglossia ?
 673                 getPolyglossiaEnvName(prev_language) : prev_language->babel();
 674         string const doc_lang = use_polyglossia ?
 675                 getPolyglossiaEnvName(doc_language) : doc_language->babel();
 676         string const outer_lang = use_polyglossia ?
 677                 getPolyglossiaEnvName(outer_language) : outer_language->babel();
 678         string lang_begin_command = use_polyglossia ?
 679                 "\\begin{$$lang}$$opts" : lyxrc.language_command_begin;
 680         string lang_end_command = use_polyglossia ?
 681                 "\\end{$$lang}" : lyxrc.language_command_end;
 682         // the '%' is necessary to prevent unwanted whitespace
 683         string lang_command_termination = "%\n";
 684
 685         // In some insets (such as Arguments), we cannot use \selectlanguage
 686         bool const localswitch = text.inset().forceLocalFontSwitch();
 687         if (localswitch) {
 688                 lang_begin_command = use_polyglossia ?
 689                             "\\text$$lang$$opts{" : lyxrc.language_command_local;
 690                 lang_end_command = "}";
 691                 lang_command_termination.clear();
 692         }
 693
 694         if (par_lang != prev_lang
 695                 // check if we already put language command in TeXEnvironment()
 696                 && !(style.isEnvironment()
 697                      && (pit == 0 || (priorpar->layout() != par.layout()
 698                                           && priorpar->getDepth() <= par.getDepth())
 699                                   || priorpar->getDepth() < par.getDepth())))
 700         {
 701                 if (!lang_end_command.empty() &&
 702                     prev_lang != outer_lang &&
 703                     !prev_lang.empty())
 704                 {
 705                         os << from_ascii(subst(lang_end_command,
 706                                 "$$lang",
 707                                 prev_lang))
 708                            << lang_command_termination;
 709                 }
 710
 711                 // We need to open a new language if we couldn't close the previous
 712                 // one (because there's no language_command_end); and even if we closed
 713                 // the previous one, if the current language is different than the
 714                 // outer_language (which is currently in effect once the previous one
 715                 // is closed).
 716                 if ((lang_end_command.empty() || par_lang != outer_lang)
 717                         && !par_lang.empty()) {
 718                         // If we're inside an inset, and that inset is within an \L or \R
 719                         // (or equivalents), then within the inset, too, any opposite
 720                         // language paragraph should appear within an \L or \R (in addition
 721                         // to, outside of, the normal language switch commands).
 722                         // This behavior is not correct for ArabTeX, though.
 723                         if (!use_polyglossia
 724                             // not for ArabTeX
 725                                 && par_language->lang() != "arabic_arabtex"
 726                                 && outer_language->lang() != "arabic_arabtex"
 727                             // are we in an inset?
 728                             && runparams.local_font != 0
 729                             // is the inset within an \L or \R?
 730                             //
 731                             // FIXME: currently, we don't check this; this means that
 732                             // we'll have unnnecessary \L and \R commands, but that
 733                             // doesn't seem to hurt (though latex will complain)
 734                             //
 735                             // is this paragraph in the opposite direction?
 736                             && runparams.local_font->isRightToLeft() != par_language->rightToLeft()) {
 737                                 // FIXME: I don't have a working copy of the Arabi package, so
 738                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 739                                 // or not...
 740                                 if (par_language->lang() == "farsi")
 741                                         os << "\\textFR{";
 742                                 else if (outer_language->lang() == "farsi")
 743                                         os << "\\textLR{";
 744                                 else if (par_language->lang() == "arabic_arabi")
 745                                         os << "\\textAR{";
 746                                 else if (outer_language->lang() == "arabic_arabi")
 747                                         os << "\\textLR{";
 748                                 // remaining RTL languages currently is hebrew
 749                                 else if (par_language->rightToLeft())
 750                                         os << "\\R{";
 751                                 else
 752                                         os << "\\L{";
 753                         }
 754                         // With CJK, the CJK tag has to be closed first (see below)
 755                         if (runparams.encoding->package() != Encoding::CJK
 756                             && !par_lang.empty()) {
 757                                 string bc = use_polyglossia ?
 758                                           getPolyglossiaBegin(lang_begin_command, par_lang, par_language->polyglossiaOpts())
 759                                           : subst(lang_begin_command, "$$lang", par_lang);
 760                                 os << bc;
 761                                 os << lang_command_termination;
 762                         }
 763                 }
 764         }
 765
 766         // Switch file encoding if necessary; no need to do this for "default"
 767         // encoding, since this only affects the position of the outputted
 768         // \inputencoding command; the encoding switch will occur when necessary
 769         if (bparams.inputenc == "auto"
 770                 && runparams.encoding->package() != Encoding::none) {
 771                 // Look ahead for future encoding changes.
 772                 // We try to output them at the beginning of the paragraph,
 773                 // since the \inputencoding command is not allowed e.g. in
 774                 // sections. For this reason we only set runparams.moving_arg
 775                 // after checking for the encoding change, otherwise the
 776                 // change would be always avoided by switchEncoding().
 777                 for (pos_type i = 0; i < par.size(); ++i) {
 778                         char_type const c = par.getChar(i);
 779                         Encoding const * const encoding =
 780                                 par.getFontSettings(bparams, i).language()->encoding();
 781                         if (encoding->package() != Encoding::CJK
 782                                 && runparams.encoding->package() == Encoding::inputenc
 783                                 && isASCII(c))
 784                                 continue;
 785                         if (par.isInset(i))
 786                                 break;
 787                         // All characters before c are in the ASCII range, and
 788                         // c is non-ASCII (but no inset), so change the
 789                         // encoding to that required by the language of c.
 790                         // With CJK, only add switch if we have CJK content at the beginning
 791                         // of the paragraph
 792                         if (i != 0 && encoding->package() == Encoding::CJK)
 793                                 continue;
 794
 795                         pair<bool, int> enc_switch = switchEncoding(os.os(),
 796                                                 bparams, runparams, *encoding);
 797                         // the following is necessary after a CJK environment in a multilingual
 798                         // context (nesting issue).
 799                         if (par_language->encoding()->package() == Encoding::CJK
 800                                 && state->open_encoding_ != CJK && state->cjk_inherited_ == 0) {
 801                                 os << "\\begin{CJK}{" << from_ascii(par_language->encoding()->latexName())
 802                                    << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 803                                 state->open_encoding_ = CJK;
 804                         }
 805                         if (encoding->package() != Encoding::none && enc_switch.first) {
 806                                 if (enc_switch.second > 0) {
 807                                         // the '%' is necessary to prevent unwanted whitespace
 808                                         os << "%\n";
 809                                 }
 810                                 // With CJK, the CJK tag had to be closed first (see above)
 811                                 if (runparams.encoding->package() == Encoding::CJK
 812                                     && !par_lang.empty()) {
 813                                         os << from_ascii(subst(
 814                                                 lang_begin_command,
 815                                                 "$$lang",
 816                                                 par_lang))
 817                                         << lang_command_termination;
 818                                 }
 819                                 runparams.encoding = encoding;
 820                         }
 821                         break;
 822                 }
 823         }
 824
 825         runparams.moving_arg |= style.needprotect;
 826         Encoding const * const prev_encoding = runparams.encoding;
 827
 828         bool const useSetSpace = bparams.documentClass().provides("SetSpace");
 829         if (par.allowParagraphCustomization()) {
 830                 if (par.params().startOfAppendix()) {
 831                         os << "\n\\appendix\n";
 832                 }
 833
 834                 if (!par.params().spacing().isDefault()
 835                         && (pit == 0 || !priorpar->hasSameLayout(par)))
 836                 {
 837                         os << from_ascii(par.params().spacing().writeEnvirBegin(useSetSpace))
 838                             << '\n';
 839                 }
 840
 841                 if (style.isCommand()) {
 842                         os << '\n';
 843                 }
 844         }
 845
 846         parStartCommand(par, os, runparams, style);
 847         Font const outerfont = text.outerFont(pit);
 848
 849         // FIXME UNICODE
 850         os << from_utf8(everypar);
 851         par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 852
 853         // Make sure that \\par is done with the font of the last
 854         // character if this has another size as the default.
 855         // This is necessary because LaTeX (and LyX on the screen)
 856         // calculates the space between the baselines according
 857         // to this font. (Matthias)
 858         //
 859         // We must not change the font for the last paragraph
 860         // of non-multipar insets, tabular cells or commands,
 861         // since this produces unwanted whitespace.
 862
 863         Font const font = par.empty()
 864                  ? par.getLayoutFont(bparams, outerfont)
 865                  : par.getFont(bparams, par.size() - 1, outerfont);
 866
 867         bool const is_command = style.isCommand();
 868
 869         if (style.resfont.size() != font.fontInfo().size()
 870             && (nextpar || maintext
 871                 || (text.inset().paragraphs().size() > 1
 872                     && text.inset().lyxCode() != CELL_CODE))
 873             && !is_command) {
 874                 os << '{';
 875                 os << "\\" << from_ascii(font.latexSize()) << " \\par}";
 876         } else if (is_command) {
 877                 os << '}';
 878                 if (!style.postcommandargs().empty())
 879                         latexArgInsets(par, os, runparams, style.postcommandargs(), "post:");
 880                 if (runparams.encoding != prev_encoding) {
 881                         runparams.encoding = prev_encoding;
 882                         if (!runparams.isFullUnicode())
 883                                 os << setEncoding(prev_encoding->iconvName());
 884                 }
 885         }
 886
 887         bool pending_newline = false;
 888         bool unskip_newline = false;
 889         switch (style.latextype) {
 890         case LATEX_ITEM_ENVIRONMENT:
 891         case LATEX_LIST_ENVIRONMENT:
 892                 if (nextpar && par.params().depth() < nextpar->params().depth())
 893                         pending_newline = true;
 894                 break;
 895         case LATEX_ENVIRONMENT: {
 896                 // if its the last paragraph of the current environment
 897                 // skip it otherwise fall through
 898                 if (nextpar
 899                         && (nextpar->layout() != par.layout()
 900                         || nextpar->params().depth() != par.params().depth()))
 901                         break;
 902         }
 903
 904         // fall through possible
 905         default:
 906                 // we don't need it for the last paragraph!!!
 907                 if (nextpar)
 908                         pending_newline = true;
 909         }
 910
 911         if (par.allowParagraphCustomization()) {
 912                 if (!par.params().spacing().isDefault()
 913                         && (runparams.isLastPar || !nextpar->hasSameLayout(par))) {
 914                         if (pending_newline)
 915                                 os << '\n';
 916
 917                         string const endtag =
 918                                 par.params().spacing().writeEnvirEnd(useSetSpace);
 919                         if (prefixIs(endtag, "\\end{"))
 920                                 os << breakln;
 921
 922                         os << from_ascii(endtag);
 923                         pending_newline = true;
 924                 }
 925         }
 926
 927         // Closing the language is needed for the last paragraph; it is also
 928         // needed if we're within an \L or \R that we may have opened above (not
 929         // necessarily in this paragraph) and are about to close.
 930         bool closing_rtl_ltr_environment = !use_polyglossia
 931                 // not for ArabTeX
 932                 && (par_language->lang() != "arabic_arabtex"
 933                     && outer_language->lang() != "arabic_arabtex")
 934                 // have we opened an \L or \R environment?
 935                 && runparams.local_font != 0
 936                 && runparams.local_font->isRightToLeft() != par_language->rightToLeft()
 937                 // are we about to close the language?
 938                 &&((nextpar && par_language->babel() != (nextpar->getParLanguage(bparams))->babel())
 939                    || (runparams.isLastPar && par_language->babel() != outer_language->babel()));
 940
 941         if (closing_rtl_ltr_environment
 942             || (runparams.isLastPar
 943                 && ((!use_polyglossia && par_language->babel() != outer_language->babel())
 944                     || (use_polyglossia && par_language->polyglossia() != outer_language->polyglossia())))) {
 945                 // Since \selectlanguage write the language to the aux file,
 946                 // we need to reset the language at the end of footnote or
 947                 // float.
 948
 949                 if (pending_newline)
 950                         os << '\n';
 951
 952                 // when the paragraph uses CJK, the language has to be closed earlier
 953                 if (font.language()->encoding()->package() != Encoding::CJK) {
 954                         if (lang_end_command.empty()) {
 955                                 // If this is a child, we should restore the
 956                                 // master language after the last paragraph.
 957                                 Language const * const current_language =
 958                                         (runparams.isLastPar && runparams.master_language)
 959                                                 ? runparams.master_language
 960                                                 : outer_language;
 961                                 string const current_lang = use_polyglossia
 962                                         ? getPolyglossiaEnvName(current_language)
 963                                         : current_language->babel();
 964                                 if (!current_lang.empty()) {
 965                                         string bc = use_polyglossia ?
 966                                                     getPolyglossiaBegin(lang_begin_command, current_lang,
 967                                                                         current_language->polyglossiaOpts())
 968                                                   : subst(lang_begin_command, "$$lang", current_lang);
 969                                         os << bc;
 970                                         pending_newline = !localswitch;
 971                                         unskip_newline = !localswitch;
 972                                 }
 973                         } else if (!par_lang.empty()) {
 974                                 // If we are in an environment, we have to close the "outer" language afterwards
 975                                 if (!style.isEnvironment() || state->open_polyglossia_lang_ != par_lang) {
 976                                         os << from_ascii(subst(
 977                                                 lang_end_command,
 978                                                 "$$lang",
 979                                                 par_lang));
 980                                         pending_newline = !localswitch;
 981                                         unskip_newline = !localswitch;
 982                                 }
 983                         }
 984                 }
 985         }
 986         if (closing_rtl_ltr_environment)
 987                 os << "}";
 988
 989         bool const last_was_separator =
 990                 par.size() > 0 && par.isEnvSeparator(par.size() - 1);
 991
 992         if (pending_newline) {
 993                 if (unskip_newline)
 994                         // prevent unwanted whitespace
 995                         os << '%';
 996                 if (!os.afterParbreak() && !last_was_separator)
 997                         os << '\n';
 998         }
 999
1000         // if this is a CJK-paragraph and the next isn't, close CJK
1001         // also if the next paragraph is a multilingual environment (because of nesting)
1002         if (nextpar
1003                 && state->open_encoding_ == CJK
1004                 && (nextpar->getParLanguage(bparams)->encoding()->package() != Encoding::CJK
1005                    || (nextpar->layout().isEnvironment() && nextpar->isMultiLingual(bparams)))
1006                 // inbetween environments, CJK has to be closed later (nesting!)
1007                 && (!style.isEnvironment() || !nextpar->layout().isEnvironment())) {
1008                 os << "\\end{CJK}\n";
1009                 state->open_encoding_ = none;
1010         }
1011
1012         // If this is the last paragraph, close the CJK environment
1013         // if necessary. If it's an environment, we'll have to \end that first.
1014         if (runparams.isLastPar && !style.isEnvironment()) {
1015                 switch (state->open_encoding_) {
1016                         case CJK: {
1017                                 // do nothing at the end of child documents
1018                                 if (maintext && buf.masterBuffer() != &buf)
1019                                         break;
1020                                 // end of main text
1021                                 if (maintext) {
1022                                         os << "\n\\end{CJK}\n";
1023                                 // end of an inset
1024                                 } else
1025                                         os << "\\end{CJK}";
1026                                 state->open_encoding_ = none;
1027                                 break;
1028                         }
1029                         case inputenc: {
1030                                 os << "\\egroup";
1031                                 state->open_encoding_ = none;
1032                                 break;
1033                         }
1034                         case none:
1035                         default:
1036                                 // do nothing
1037                                 break;
1038                 }
1039         }
1040
1041         // If this is the last paragraph, and a local_font was set upon entering
1042         // the inset, and we're using "auto" or "default" encoding, the encoding
1043         // should be set back to that local_font's encoding.
1044         // However, do not change the encoding when a fully unicode aware backend
1045         // such as XeTeX is used.
1046         if (runparams.isLastPar && runparams_in.local_font != 0
1047             && runparams_in.encoding != runparams_in.local_font->language()->encoding()
1048             && (bparams.inputenc == "auto" || bparams.inputenc == "default")
1049             && (!runparams.isFullUnicode())) {
1050                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
1051                 os << setEncoding(runparams_in.encoding->iconvName());
1052         }
1053         // Otherwise, the current encoding should be set for the next paragraph.
1054         else
1055                 runparams_in.encoding = runparams.encoding;
1056
1057
1058         // we don't need a newline for the last paragraph!!!
1059         // Note from JMarc: we will re-add a \n explicitly in
1060         // TeXEnvironment, because it is needed in this case
1061         if (nextpar && !os.afterParbreak() && !last_was_separator) {
1062                 // Make sure to start a new line
1063                 os << breakln;
1064                 Layout const & next_layout = nextpar->layout();
1065                 // A newline '\n' is always output before a command,
1066                 // so avoid doubling it.
1067                 if (!next_layout.isCommand()) {
1068                         // Here we now try to avoid spurious empty lines by
1069                         // outputting a paragraph break only if: (case 1) the
1070                         // paragraph style allows parbreaks and no \begin, \end
1071                         // or \item tags are going to follow (i.e., if the next
1072                         // isn't the first or the current isn't the last
1073                         // paragraph of an environment or itemize) and the
1074                         // depth and alignment of the following paragraph is
1075                         // unchanged, or (case 2) the following is a
1076                         // non-environment paragraph whose depth is increased
1077                         // but whose alignment is unchanged, or (case 3) the
1078                         // paragraph is not an environment and the next one is a
1079                         // non-itemize-like env at lower depth, or (case 4) the
1080                         // paragraph is a command not followed by an environment
1081                         // and the alignment of the current and next paragraph
1082                         // is unchanged, or (case 5) the current alignment is
1083                         // changed and a standard paragraph follows.
1084                         DocumentClass const & tclass = bparams.documentClass();
1085                         if ((style == next_layout
1086                              && !style.parbreak_is_newline
1087                              && !text.inset().getLayout().parbreakIsNewline()
1088                              && style.latextype != LATEX_ITEM_ENVIRONMENT
1089                              && style.latextype != LATEX_LIST_ENVIRONMENT
1090                              && style.align == par.getAlign()
1091                              && nextpar->getDepth() == par.getDepth()
1092                              && nextpar->getAlign() == par.getAlign())
1093                             || (!next_layout.isEnvironment()
1094                                 && nextpar->getDepth() > par.getDepth()
1095                                 && nextpar->getAlign() == par.getAlign())
1096                             || (!style.isEnvironment()
1097                                 && next_layout.latextype == LATEX_ENVIRONMENT
1098                                 && nextpar->getDepth() < par.getDepth())
1099                             || (style.isCommand()
1100                                 && !next_layout.isEnvironment()
1101                                 && style.align == par.getAlign()
1102                                 && next_layout.align == nextpar->getAlign())
1103                             || (style.align != par.getAlign()
1104                                 && tclass.isDefaultLayout(next_layout))) {
1105                                 os << '\n';
1106                         }
1107                 }
1108         }
1109
1110         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " done; ptr "
1111                 << &par << " next " << nextpar);
1112
1113         return;
1114 }
1115
1116
1117 // LaTeX all paragraphs
1118 void latexParagraphs(Buffer const & buf,
1119                      Text const & text,
1120                      otexstream & os,
1121                      OutputParams const & runparams,
1122                      string const & everypar)
1123 {
1124         LASSERT(runparams.par_begin <= runparams.par_end,
1125                 { os << "% LaTeX Output Error\n"; return; } );
1126
1127         BufferParams const & bparams = buf.params();
1128
1129         bool const maintext = text.isMainText();
1130         bool const is_child = buf.masterBuffer() != &buf;
1131
1132         // Open a CJK environment at the beginning of the main buffer
1133         // if the document's language is a CJK language
1134         // (but not in child documents)
1135         OutputState * state = getOutputState();
1136         if (maintext && !is_child
1137             && bparams.encoding().package() == Encoding::CJK) {
1138                 os << "\\begin{CJK}{" << from_ascii(bparams.encoding().latexName())
1139                 << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
1140                 state->open_encoding_ = CJK;
1141         }
1142         // if "auto begin" is switched off, explicitly switch the
1143         // language on at start
1144         string const mainlang = runparams.use_polyglossia
1145                 ? getPolyglossiaEnvName(bparams.language)
1146                 : bparams.language->babel();
1147         string const lang_begin_command = runparams.use_polyglossia ?
1148                 "\\begin{$$lang}$$opts" : lyxrc.language_command_begin;
1149
1150         if (maintext && !lyxrc.language_auto_begin &&
1151             !mainlang.empty()) {
1152                 // FIXME UNICODE
1153                 string bc = runparams.use_polyglossia ?
1154                             getPolyglossiaBegin(lang_begin_command, mainlang,
1155                                                 bparams.language->polyglossiaOpts())
1156                           : subst(lang_begin_command, "$$lang", mainlang);
1157                 os << bc;
1158                 os << '\n';
1159         }
1160
1161         ParagraphList const & paragraphs = text.paragraphs();
1162
1163         if (runparams.par_begin == runparams.par_end) {
1164                 // The full doc will be exported but it is easier to just rely on
1165                 // runparams range parameters that will be passed TeXEnvironment.
1166                 runparams.par_begin = 0;
1167                 runparams.par_end = paragraphs.size();
1168         }
1169
1170         pit_type pit = runparams.par_begin;
1171         // lastpit is for the language check after the loop.
1172         pit_type lastpit = pit;
1173         // variables used in the loop:
1174         bool was_title = false;
1175         bool already_title = false;
1176         DocumentClass const & tclass = bparams.documentClass();
1177
1178         for (; pit < runparams.par_end; ++pit) {
1179                 lastpit = pit;
1180                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
1181
1182                 // FIXME This check should not be needed. We should
1183                 // perhaps issue an error if it is.
1184                 Layout const & layout = text.inset().forcePlainLayout() ?
1185                                 tclass.plainLayout() : par->layout();
1186
1187                 if (layout.intitle) {
1188                         if (already_title) {
1189                                 LYXERR0("Error in latexParagraphs: You"
1190                                         " should not mix title layouts"
1191                                         " with normal ones.");
1192                         } else if (!was_title) {
1193                                 was_title = true;
1194                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1195                                         os << "\\begin{"
1196                                                         << from_ascii(tclass.titlename())
1197                                                         << "}\n";
1198                                 }
1199                         }
1200                 } else if (was_title && !already_title) {
1201                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
1202                                 os << "\\end{" << from_ascii(tclass.titlename())
1203                                                 << "}\n";
1204                         }
1205                         else {
1206                                 os << "\\" << from_ascii(tclass.titlename())
1207                                                 << "\n";
1208                         }
1209                         already_title = true;
1210                         was_title = false;
1211                 }
1212
1213
1214                 if (!layout.isEnvironment() && par->params().leftIndent().zero()) {
1215                         // This is a standard top level paragraph, TeX it and continue.
1216                         TeXOnePar(buf, text, pit, os, runparams, everypar);
1217                         continue;
1218                 }
1219
1220                 TeXEnvironmentData const data =
1221                         prepareEnvironment(buf, text, par, os, runparams);
1222                 // pit can be changed in TeXEnvironment.
1223                 TeXEnvironment(buf, text, runparams, pit, os);
1224                 finishEnvironment(os, runparams, data);
1225         }
1226
1227         if (pit == runparams.par_end) {
1228                         // Make sure that the last paragraph is
1229                         // correctly terminated (because TeXOnePar does
1230                         // not add a \n in this case)
1231                         //os << '\n';
1232         }
1233
1234         // It might be that we only have a title in this document
1235         if (was_title && !already_title) {
1236                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1237                         os << "\\end{" << from_ascii(tclass.titlename())
1238                            << "}\n";
1239                 } else {
1240                         os << "\\" << from_ascii(tclass.titlename())
1241                            << "\n";
1242                 }
1243         }
1244
1245         // if "auto end" is switched off, explicitly close the language at the end
1246         // but only if the last par is in a babel language
1247         string const lang_end_command = runparams.use_polyglossia ?
1248                 "\\end{$$lang}" : lyxrc.language_command_end;
1249         if (maintext && !lyxrc.language_auto_end && !mainlang.empty() &&
1250                 paragraphs.at(lastpit).getParLanguage(bparams)->encoding()->package() != Encoding::CJK) {
1251                 os << from_utf8(subst(lang_end_command,
1252                                         "$$lang",
1253                                         mainlang))
1254                         << '\n';
1255         }
1256
1257         // If the last paragraph is an environment, we'll have to close
1258         // CJK at the very end to do proper nesting.
1259         if (maintext && !is_child && state->open_encoding_ == CJK) {
1260                 os << "\\end{CJK}\n";
1261                 state->open_encoding_ = none;
1262         }
1263         // Likewise for polyglossia
1264         if (maintext && !is_child && state->open_polyglossia_lang_ != "") {
1265                 os << "\\end{" << state->open_polyglossia_lang_ << "}\n";
1266                 state->open_polyglossia_lang_ = "";
1267         }
1268
1269         // reset inherited encoding
1270         if (state->cjk_inherited_ > 0) {
1271                 state->cjk_inherited_ -= 1;
1272                 if (state->cjk_inherited_ == 0)
1273                         state->open_encoding_ = CJK;
1274         }
1275 }
1276
1277
1278 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
1279                    OutputParams const & runparams, Encoding const & newEnc,
1280                    bool force)
1281 {
1282         Encoding const & oldEnc = *runparams.encoding;
1283         bool moving_arg = runparams.moving_arg;
1284         // If we switch from/to CJK, we need to switch anyway, despite custom inputenc
1285         bool const from_to_cjk =
1286                 (oldEnc.package() == Encoding::CJK && newEnc.package() != Encoding::CJK)
1287                 || (oldEnc.package() != Encoding::CJK && newEnc.package() == Encoding::CJK);
1288         if (!force && !from_to_cjk
1289             && ((bparams.inputenc != "auto" && bparams.inputenc != "default") || moving_arg))
1290                 return make_pair(false, 0);
1291
1292         // Do nothing if the encoding is unchanged.
1293         if (oldEnc.name() == newEnc.name())
1294                 return make_pair(false, 0);
1295
1296         // FIXME We ignore encoding switches from/to encodings that do
1297         // neither support the inputenc package nor the CJK package here.
1298         // This does of course only work in special cases (e.g. switch from
1299         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
1300         // but it is the best we can do
1301         if (oldEnc.package() == Encoding::none
1302                 || newEnc.package() == Encoding::none)
1303                 return make_pair(false, 0);
1304
1305         LYXERR(Debug::LATEX, "Changing LaTeX encoding from "
1306                 << oldEnc.name() << " to " << newEnc.name());
1307         os << setEncoding(newEnc.iconvName());
1308         if (bparams.inputenc == "default")
1309                 return make_pair(true, 0);
1310
1311         docstring const inputenc_arg(from_ascii(newEnc.latexName()));
1312         OutputState * state = getOutputState();
1313         switch (newEnc.package()) {
1314                 case Encoding::none:
1315                 case Encoding::japanese:
1316                         // shouldn't ever reach here, see above
1317                         return make_pair(true, 0);
1318                 case Encoding::inputenc: {
1319                         int count = inputenc_arg.length();
1320                         if (oldEnc.package() == Encoding::CJK &&
1321                             state->open_encoding_ == CJK) {
1322                                 os << "\\end{CJK}";
1323                                 state->open_encoding_ = none;
1324                                 count += 9;
1325                         }
1326                         else if (oldEnc.package() == Encoding::inputenc &&
1327                                  state->open_encoding_ == inputenc) {
1328                                 os << "\\egroup";
1329                                 state->open_encoding_ = none;
1330                                 count += 7;
1331                         }
1332                         if (runparams.local_font != 0
1333                             &&  oldEnc.package() == Encoding::CJK) {
1334                                 // within insets, \inputenc switches need
1335                                 // to be embraced within \bgroup...\egroup;
1336                                 // else CJK fails.
1337                                 os << "\\bgroup";
1338                                 count += 7;
1339                                 state->open_encoding_ = inputenc;
1340                         }
1341                         // with the japanese option, inputenc is omitted.
1342                         if (runparams.use_japanese)
1343                                 return make_pair(true, count);
1344                         os << "\\inputencoding{" << inputenc_arg << '}';
1345                         return make_pair(true, count + 16);
1346                 }
1347                 case Encoding::CJK: {
1348                         int count = inputenc_arg.length();
1349                         if (oldEnc.package() == Encoding::CJK &&
1350                             state->open_encoding_ == CJK) {
1351                                 os << "\\end{CJK}";
1352                                 count += 9;
1353                         }
1354                         if (oldEnc.package() == Encoding::inputenc &&
1355                             state->open_encoding_ == inputenc) {
1356                                 os << "\\egroup";
1357                                 count += 7;
1358                         }
1359                         os << "\\begin{CJK}{" << inputenc_arg << "}{"
1360                            << from_ascii(bparams.fonts_cjk) << "}";
1361                         state->open_encoding_ = CJK;
1362                         return make_pair(true, count + 15);
1363                 }
1364         }
1365         // Dead code to avoid a warning:
1366         return make_pair(true, 0);
1367
1368 }
1369
1370 } // namespace lyx