src/output_latex.cpp

   1 /**
   2  * \file output_latex.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars Gullik Bjønnes
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "output_latex.h"
  14
  15 #include "Buffer.h"
  16 #include "BufferParams.h"
  17 #include "Encoding.h"
  18 #include "Font.h"
  19 #include "InsetList.h"
  20 #include "Language.h"
  21 #include "Layout.h"
  22 #include "LyXRC.h"
  23 #include "OutputParams.h"
  24 #include "Paragraph.h"
  25 #include "ParagraphParameters.h"
  26 #include "TextClass.h"
  27 #include "TexRow.h"
  28
  29 #include "insets/InsetBibitem.h"
  30 #include "insets/InsetArgument.h"
  31
  32 #include "support/lassert.h"
  33 #include "support/convert.h"
  34 #include "support/debug.h"
  35 #include "support/lstrings.h"
  36 #include "support/textutils.h"
  37
  38 #include <algorithm>
  39 #include <boost/next_prior.hpp>
  40 #include <list>
  41
  42 using namespace std;
  43 using namespace lyx::support;
  44
  45
  46 namespace lyx {
  47
  48 namespace {
  49
  50 enum OpenEncoding {
  51         none,
  52         inputenc,
  53         CJK
  54 };
  55
  56 static int open_encoding_ = none;
  57 static int cjk_inherited_ = 0;
  58 Language const * prev_env_language_ = 0;
  59
  60
  61 string const getPolyglossiaEnvName(Language const * lang)
  62 {
  63         string result = lang->polyglossia();
  64         if (result == "arabic")
  65                 // exceptional spelling; see polyglossia docs.
  66                 result = "Arabic";
  67         return result;
  68 }
  69
  70
  71 struct TeXEnvironmentData
  72 {
  73         bool cjk_nested;
  74         Layout const * style;
  75         Language const * par_language;
  76         Encoding const * prev_encoding;
  77         bool leftindent_open;
  78 };
  79
  80
  81 static TeXEnvironmentData prepareEnvironment(Buffer const & buf,
  82                                         Text const & text,
  83                                         ParagraphList::const_iterator pit,
  84                                         otexstream & os,
  85                                         OutputParams const & runparams)
  86 {
  87         TeXEnvironmentData data;
  88
  89         BufferParams const & bparams = buf.params();
  90
  91         // FIXME This test should not be necessary.
  92         // We should perhaps issue an error if it is.
  93         Layout const & style = text.inset().forcePlainLayout() ?
  94                 bparams.documentClass().plainLayout() : pit->layout();
  95
  96         ParagraphList const & paragraphs = text.paragraphs();
  97         ParagraphList::const_iterator const priorpit =
  98                 pit == paragraphs.begin() ? pit : boost::prior(pit);
  99
 100         bool const use_prev_env_language = prev_env_language_ != 0
 101                         && priorpit->layout().isEnvironment()
 102                         && (priorpit->getDepth() > pit->getDepth()
 103                             || (priorpit->getDepth() == pit->getDepth()
 104                                 && priorpit->layout() != pit->layout()));
 105
 106         data.prev_encoding = runparams.encoding;
 107         data.par_language = pit->getParLanguage(bparams);
 108         Language const * const doc_language = bparams.language;
 109         Language const * const prev_par_language =
 110                 (pit != paragraphs.begin())
 111                 ? (use_prev_env_language ? prev_env_language_
 112                                          : priorpit->getParLanguage(bparams))
 113                 : doc_language;
 114
 115         bool const use_polyglossia = runparams.use_polyglossia;
 116         string const par_lang = use_polyglossia ?
 117                 getPolyglossiaEnvName(data.par_language) : data.par_language->babel();
 118         string const prev_par_lang = use_polyglossia ?
 119                 getPolyglossiaEnvName(prev_par_language) : prev_par_language->babel();
 120         string const doc_lang = use_polyglossia ?
 121                 getPolyglossiaEnvName(doc_language) : doc_language->babel();
 122         string const lang_begin_command = use_polyglossia ?
 123                 "\\begin{$$lang}" : lyxrc.language_command_begin;
 124         string const lang_end_command = use_polyglossia ?
 125                 "\\end{$$lang}" : lyxrc.language_command_end;
 126
 127         if (par_lang != prev_par_lang) {
 128                 if (!lang_end_command.empty() &&
 129                     prev_par_lang != doc_lang &&
 130                     !prev_par_lang.empty()) {
 131                         os << from_ascii(subst(
 132                                 lang_end_command,
 133                                 "$$lang",
 134                                 prev_par_lang))
 135                           // the '%' is necessary to prevent unwanted whitespace
 136                           << "%\n";
 137                 }
 138
 139                 if ((lang_end_command.empty() ||
 140                     par_lang != doc_lang) &&
 141                     !par_lang.empty()) {
 142                         os << from_ascii(subst(
 143                                 lang_begin_command,
 144                                 "$$lang",
 145                                 par_lang));
 146                         if (use_polyglossia
 147                             && !data.par_language->polyglossiaOpts().empty())
 148                                         os << "["
 149                                            << from_ascii(data.par_language->polyglossiaOpts())
 150                                            << "]";
 151                           // the '%' is necessary to prevent unwanted whitespace
 152                         os << "%\n";
 153                 }
 154         }
 155
 156         data.leftindent_open = false;
 157         if (!pit->params().leftIndent().zero()) {
 158                 os << "\\begin{LyXParagraphLeftIndent}{"
 159                    << from_ascii(pit->params().leftIndent().asLatexString())
 160                    << "}\n";
 161                 data.leftindent_open = true;
 162         }
 163
 164         if (style.isEnvironment()) {
 165                 os << "\\begin{" << from_ascii(style.latexname()) << '}';
 166                 if (!style.latexargs().empty()) {
 167                         OutputParams rp = runparams;
 168                         rp.local_font = &pit->getFirstFontSettings(bparams);
 169                         latexArgInsets(paragraphs, pit, os, rp, style.latexargs());
 170                 }
 171                 if (style.latextype == LATEX_LIST_ENVIRONMENT) {
 172                         os << '{'
 173                            << pit->params().labelWidthString()
 174                            << "}\n";
 175                 } else if (style.labeltype == LABEL_BIBLIO) {
 176                         if (pit->params().labelWidthString().empty())
 177                                 os << '{' << bibitemWidest(buf, runparams) << "}\n";
 178                         else
 179                                 os << '{'
 180                                   << pit->params().labelWidthString()
 181                                   << "}\n";
 182                 } else
 183                         os << from_ascii(style.latexparam()) << '\n';
 184         }
 185         data.style = &style;
 186
 187         // in multilingual environments, the CJK tags have to be nested properly
 188         data.cjk_nested = false;
 189         if (data.par_language->encoding()->package() == Encoding::CJK &&
 190             open_encoding_ != CJK && pit->isMultiLingual(bparams)) {
 191                 if (prev_par_language->encoding()->package() == Encoding::CJK)
 192                         os << "\\begin{CJK}{" << from_ascii(data.par_language->encoding()->latexName())
 193                            << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 194                 open_encoding_ = CJK;
 195                 data.cjk_nested = true;
 196         }
 197         return data;
 198 }
 199
 200
 201 static void finishEnvironment(otexstream & os, OutputParams const & runparams,
 202                                TeXEnvironmentData const & data)
 203 {
 204         if (open_encoding_ == CJK && data.cjk_nested) {
 205                 // We need to close the encoding even if it does not change
 206                 // to do correct environment nesting
 207                 os << "\\end{CJK}\n";
 208                 open_encoding_ = none;
 209         }
 210
 211         if (data.style->isEnvironment()) {
 212                 os << "\\end{" << from_ascii(data.style->latexname()) << "}\n";
 213                 prev_env_language_ = data.par_language;
 214                 if (runparams.encoding != data.prev_encoding) {
 215                         runparams.encoding = data.prev_encoding;
 216                         if (!runparams.isFullUnicode())
 217                                 os << setEncoding(data.prev_encoding->iconvName());
 218                 }
 219         }
 220
 221         if (data.leftindent_open) {
 222                 os << "\\end{LyXParagraphLeftIndent}\n";
 223                 prev_env_language_ = data.par_language;
 224                 if (runparams.encoding != data.prev_encoding) {
 225                         runparams.encoding = data.prev_encoding;
 226                         if (!runparams.isFullUnicode())
 227                                 os << setEncoding(data.prev_encoding->iconvName());
 228                 }
 229         }
 230 }
 231
 232
 233 void TeXEnvironment(Buffer const & buf, Text const & text,
 234                     OutputParams const & runparams,
 235                     pit_type & pit, otexstream & os)
 236 {
 237         ParagraphList const & paragraphs = text.paragraphs();
 238         ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 239         LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << pit);
 240
 241         Layout const & current_layout = par->layout();
 242         depth_type const current_depth = par->params().depth();
 243         Length const & current_left_indent = par->params().leftIndent();
 244
 245         // This is for debugging purpose at the end.
 246         pit_type const par_begin = pit;
 247         for (; pit < runparams.par_end; ++pit) {
 248                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 249
 250                 // check first if this is an higher depth paragraph.
 251                 bool go_out = (par->params().depth() < current_depth);
 252                 if (par->params().depth() == current_depth) {
 253                         // This environment is finished.
 254                         go_out |= (par->layout() != current_layout);
 255                         go_out |= (par->params().leftIndent() != current_left_indent);
 256                 }
 257                 if (go_out) {
 258                         // nothing to do here, restore pit and go out.
 259                         pit--;
 260                         break;
 261                 }
 262
 263                 if (par->layout() == current_layout
 264                         && par->params().depth() == current_depth
 265                         && par->params().leftIndent() == current_left_indent) {
 266                         // We are still in the same environment so TeXOnePar and continue;
 267                         TeXOnePar(buf, text, pit, os, runparams);
 268                         continue;
 269                 }
 270
 271                 // We are now in a deeper environment.
 272                 // Either par->layout() != current_layout
 273                 // Or     par->params().depth() > current_depth
 274                 // Or     par->params().leftIndent() != current_left_indent)
 275
 276                 if (par->layout().isParagraph()) {
 277                         // FIXME (Lgb): How to handle this?
 278                         //&& !suffixIs(os, "\n\n")
 279
 280                         // (ARRae) There should be at least one '\n' already but we need there to
 281                         // be two for Standard paragraphs that are depth-increment'ed to be
 282                         // output correctly. However, tables can also be paragraphs so
 283                         // don't adjust them.
 284
 285                         // FIXME (Lgb): Will it ever harm to have one '\n' too
 286                         // many? i.e. that we sometimes will have
 287                         // three in a row.
 288                         os << '\n';
 289                 }
 290
 291                 // FIXME This test should not be necessary.
 292                 // We should perhaps issue an error if it is.
 293                 bool const force_plain_layout = text.inset().forcePlainLayout();
 294                 Layout const & style = force_plain_layout
 295                         ? buf.params().documentClass().plainLayout()
 296                         : par->layout();
 297
 298                 if (!style.isEnvironment()) {
 299                         // This is a standard paragraph, no need to call TeXEnvironment.
 300                         TeXOnePar(buf, text, pit, os, runparams);
 301                         continue;
 302                 }
 303
 304                 // This is a new environment.
 305                 TeXEnvironmentData const data =
 306                         prepareEnvironment(buf, text, par, os, runparams);
 307                 // Recursive call to TeXEnvironment!
 308                 TeXEnvironment(buf, text, runparams, pit, os);
 309                 finishEnvironment(os, runparams, data);
 310         }
 311
 312         if (pit != runparams.par_end)
 313                 LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << par_begin << " done.");
 314 }
 315
 316
 317 void getArgInsets(otexstream & os, OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs,
 318                   map<int, lyx::InsetArgument const *> ilist, vector<string> required, string const & prefix)
 319 {
 320         unsigned int const argnr = latexargs.size();
 321         if (argnr == 0)
 322                 return;
 323
 324         for (unsigned int i = 1; i <= argnr; ++i) {
 325                 map<int, InsetArgument const *>::const_iterator lit = ilist.find(i);
 326                 bool inserted = false;
 327                 if (lit != ilist.end()) {
 328                         InsetArgument const * ins = (*lit).second;
 329                         if (ins) {
 330                                 Layout::LaTeXArgMap::const_iterator const lait =
 331                                                 latexargs.find(ins->name());
 332                                 if (lait != latexargs.end()) {
 333                                         Layout::latexarg arg = (*lait).second;
 334                                         docstring ldelim = arg.mandatory ?
 335                                                         from_ascii("{") : from_ascii("[");
 336                                         docstring rdelim = arg.mandatory ?
 337                                                         from_ascii("}") : from_ascii("]");
 338                                         if (!arg.ldelim.empty())
 339                                                 ldelim = arg.ldelim;
 340                                         if (!arg.rdelim.empty())
 341                                                 rdelim = arg.rdelim;
 342                                         ins->latexArgument(os, runparams, ldelim, rdelim, arg.presetarg);
 343                                         inserted = true;
 344                                 }
 345                         }
 346                 }
 347                 if (!inserted) {
 348                         Layout::LaTeXArgMap::const_iterator lait = latexargs.begin();
 349                         Layout::LaTeXArgMap::const_iterator const laend = latexargs.end();
 350                         for (; lait != laend; ++lait) {
 351                                 string const name = prefix + convert<string>(i);
 352                                 if ((*lait).first == name) {
 353                                         Layout::latexarg arg = (*lait).second;
 354                                         docstring preset = arg.presetarg;
 355                                         if (!arg.defaultarg.empty()) {
 356                                                 if (!preset.empty())
 357                                                         preset += ",";
 358                                                 preset += arg.defaultarg;
 359                                         }
 360                                         if (arg.mandatory) {
 361                                                 docstring ldelim = arg.ldelim.empty() ?
 362                                                                 from_ascii("{") : arg.ldelim;
 363                                                 docstring rdelim = arg.rdelim.empty() ?
 364                                                                 from_ascii("}") : arg.rdelim;
 365                                                 os << ldelim << preset << rdelim;
 366                                         } else if (!preset.empty()) {
 367                                                 docstring ldelim = arg.ldelim.empty() ?
 368                                                                 from_ascii("[") : arg.ldelim;
 369                                                 docstring rdelim = arg.rdelim.empty() ?
 370                                                                 from_ascii("]") : arg.rdelim;
 371                                                 os << ldelim << preset << rdelim;
 372                                         } else if (find(required.begin(), required.end(),
 373                                                    (*lait).first) != required.end()) {
 374                                                 docstring ldelim = arg.ldelim.empty() ?
 375                                                                 from_ascii("[") : arg.ldelim;
 376                                                 docstring rdelim = arg.rdelim.empty() ?
 377                                                                 from_ascii("]") : arg.rdelim;
 378                                                 os << ldelim << rdelim;
 379                                         } else
 380                                                 break;
 381                                 }
 382                         }
 383                 }
 384         }
 385 }
 386
 387
 388 } // namespace anon
 389
 390
 391 void latexArgInsets(Paragraph const & par, otexstream & os,
 392         OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs, string const & prefix)
 393 {
 394         map<int, InsetArgument const *> ilist;
 395         vector<string> required;
 396
 397         InsetList::const_iterator it = par.insetList().begin();
 398         InsetList::const_iterator end = par.insetList().end();
 399         for (; it != end; ++it) {
 400                 if (it->inset->lyxCode() == ARG_CODE) {
 401                         InsetArgument const * ins =
 402                                 static_cast<InsetArgument const *>(it->inset);
 403                         if (ins->name().empty())
 404                                 LYXERR0("Error: Unnamed argument inset!");
 405                         else {
 406                                 string const name = prefix.empty() ? ins->name() : split(ins->name(), ':');
 407                                 unsigned int const nr = convert<unsigned int>(name);
 408                                 ilist[nr] = ins;
 409                                 Layout::LaTeXArgMap::const_iterator const lit =
 410                                                 latexargs.find(ins->name());
 411                                 if (lit != latexargs.end()) {
 412                                         Layout::latexarg const & arg = (*lit).second;
 413                                         if (!arg.requires.empty()) {
 414                                                 vector<string> req = getVectorFromString(arg.requires);
 415                                                 required.insert(required.end(), req.begin(), req.end());
 416                                         }
 417                                 }
 418                         }
 419                 }
 420         }
 421         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 422 }
 423
 424
 425 void latexArgInsets(ParagraphList const & pars, ParagraphList::const_iterator pit,
 426         otexstream & os, OutputParams const & runparams, Layout::LaTeXArgMap const & latexargs,
 427         string const & prefix)
 428 {
 429         map<int, InsetArgument const *> ilist;
 430         vector<string> required;
 431
 432         depth_type const current_depth = pit->params().depth();
 433         Layout const current_layout = pit->layout();
 434
 435         // get the first paragraph in sequence with this layout and depth
 436         pit_type offset = 0;
 437         while (true) {
 438                 if (boost::prior(pit, offset) == pars.begin())
 439                         break;
 440                 ParagraphList::const_iterator priorpit = boost::prior(pit, offset + 1);
 441                 if (priorpit->layout() == current_layout
 442                     && priorpit->params().depth() == current_depth)
 443                         ++offset;
 444                 else
 445                         break;
 446         }
 447
 448         ParagraphList::const_iterator spit = boost::prior(pit, offset);
 449
 450         for (; spit != pars.end(); ++spit) {
 451                 if (spit->layout() != current_layout || spit->params().depth() < current_depth)
 452                         break;
 453                 if (spit->params().depth() > current_depth)
 454                         continue;
 455                 InsetList::const_iterator it = spit->insetList().begin();
 456                 InsetList::const_iterator end = spit->insetList().end();
 457                 for (; it != end; ++it) {
 458                         if (it->inset->lyxCode() == ARG_CODE) {
 459                                 InsetArgument const * ins =
 460                                         static_cast<InsetArgument const *>(it->inset);
 461                                 if (ins->name().empty())
 462                                         LYXERR0("Error: Unnamed argument inset!");
 463                                 else {
 464                                         string const name = prefix.empty() ? ins->name() : split(ins->name(), ':');
 465                                         unsigned int const nr = convert<unsigned int>(name);
 466                                         if (ilist.find(nr) == ilist.end())
 467                                                 ilist[nr] = ins;
 468                                         Layout::LaTeXArgMap::const_iterator const lit =
 469                                                         latexargs.find(ins->name());
 470                                         if (lit != latexargs.end()) {
 471                                                 Layout::latexarg const & arg = (*lit).second;
 472                                                 if (!arg.requires.empty()) {
 473                                                         vector<string> req = getVectorFromString(arg.requires);
 474                                                         required.insert(required.end(), req.begin(), req.end());
 475                                                 }
 476                                         }
 477                                 }
 478                         }
 479                 }
 480         }
 481         getArgInsets(os, runparams, latexargs, ilist, required, prefix);
 482 }
 483
 484 namespace {
 485
 486 // output the proper paragraph start according to latextype.
 487 void parStartCommand(Paragraph const & par, otexstream & os,
 488                      OutputParams const & runparams, Layout const & style)
 489 {
 490         switch (style.latextype) {
 491         case LATEX_COMMAND:
 492                 os << '\\' << from_ascii(style.latexname());
 493
 494                 // Command arguments
 495                 if (!style.latexargs().empty())
 496                         latexArgInsets(par, os, runparams, style.latexargs());
 497                 os << from_ascii(style.latexparam());
 498                 break;
 499         case LATEX_ITEM_ENVIRONMENT:
 500         case LATEX_LIST_ENVIRONMENT:
 501                 os << "\\" + style.itemcommand();
 502                 // Item arguments
 503                 if (!style.itemargs().empty())
 504                         latexArgInsets(par, os, runparams, style.itemargs(), "item:");
 505                 os << " ";
 506                 break;
 507         case LATEX_BIB_ENVIRONMENT:
 508                 // ignore this, the inset will write itself
 509                 break;
 510         default:
 511                 break;
 512         }
 513 }
 514
 515 } // namespace anon
 516
 517 // FIXME: this should be anonymous
 518 void TeXOnePar(Buffer const & buf,
 519                Text const & text,
 520                pit_type pit,
 521                otexstream & os,
 522                OutputParams const & runparams_in,
 523                string const & everypar,
 524                int start_pos, int end_pos)
 525 {
 526         BufferParams const & bparams = runparams_in.is_child
 527                 ? buf.masterBuffer()->params() : buf.params();
 528         ParagraphList const & paragraphs = text.paragraphs();
 529         Paragraph const & par = paragraphs.at(pit);
 530         // FIXME This check should not really be needed.
 531         // Perhaps we should issue an error if it is.
 532         Layout const style = text.inset().forcePlainLayout() ?
 533                 bparams.documentClass().plainLayout() : par.layout();
 534
 535         if (style.inpreamble)
 536                 return;
 537
 538         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " ptr " << &par << " '"
 539                 << everypar << "'");
 540
 541         OutputParams runparams = runparams_in;
 542         runparams.isLastPar = (pit == pit_type(paragraphs.size() - 1));
 543         // We reinitialze par begin and end to be on the safe side
 544         // with embedded inset as we don't know if they set those
 545         // value correctly.
 546         runparams.par_begin = 0;
 547         runparams.par_end = 0;
 548
 549         bool const maintext = text.isMainText();
 550         // we are at the beginning of an inset and CJK is already open;
 551         // we count inheritation levels to get the inset nesting right.
 552         if (pit == 0 && !maintext
 553             && (cjk_inherited_ > 0 || open_encoding_ == CJK)) {
 554                 cjk_inherited_ += 1;
 555                 open_encoding_ = none;
 556         }
 557
 558         if (text.inset().isPassThru()) {
 559                 Font const outerfont = text.outerFont(pit);
 560
 561                 // No newline before first paragraph in this lyxtext
 562                 if (pit > 0) {
 563                         os << '\n';
 564                         if (!text.inset().getLayout().parbreakIsNewline())
 565                                 os << '\n';
 566                 }
 567
 568                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 569                 return;
 570         }
 571
 572         Paragraph const * nextpar = runparams.isLastPar
 573                 ? 0 : &paragraphs.at(pit + 1);
 574
 575         if (style.pass_thru) {
 576                 Font const outerfont = text.outerFont(pit);
 577                 parStartCommand(par, os, runparams, style);
 578
 579                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 580
 581                 // I did not create a parEndCommand for this minuscule
 582                 // task because in the other user of parStartCommand
 583                 // the code is different (JMarc)
 584                 if (style.isCommand())
 585                         os << "}\n";
 586                 else
 587                         os << '\n';
 588                 if (!style.parbreak_is_newline) {
 589                         os << '\n';
 590                 } else if (nextpar && !style.isEnvironment()) {
 591                         Layout const nextstyle = text.inset().forcePlainLayout()
 592                                 ? bparams.documentClass().plainLayout()
 593                                 : nextpar->layout();
 594                         if (nextstyle.name() != style.name())
 595                                 os << '\n';
 596                 }
 597
 598                 return;
 599         }
 600
 601         // This paragraph's language
 602         Language const * const par_language = par.getParLanguage(bparams);
 603         // The document's language
 604         Language const * const doc_language = bparams.language;
 605         // The language that was in effect when the environment this paragraph is
 606         // inside of was opened
 607         Language const * const outer_language =
 608                 (runparams.local_font != 0) ?
 609                         runparams.local_font->language() : doc_language;
 610
 611         Paragraph const * priorpar = (pit == 0) ? 0 : &paragraphs.at(pit - 1);
 612
 613         // The previous language that was in effect is the language of the
 614         // previous paragraph, unless the previous paragraph is inside an
 615         // environment with nesting depth greater than (or equal to, but with
 616         // a different layout) the current one. If there is no previous
 617         // paragraph, the previous language is the outer language.
 618         bool const use_prev_env_language = prev_env_language_ != 0
 619                         && priorpar
 620                         && priorpar->layout().isEnvironment()
 621                         && (priorpar->getDepth() > par.getDepth()
 622                             || (priorpar->getDepth() == par.getDepth()
 623                                     && priorpar->layout() != par.layout()));
 624         Language const * const prev_language =
 625                 (pit != 0)
 626                 ? (use_prev_env_language ? prev_env_language_
 627                                          : priorpar->getParLanguage(bparams))
 628                 : outer_language;
 629
 630
 631         bool const use_polyglossia = runparams.use_polyglossia;
 632         string const par_lang = use_polyglossia ?
 633                 getPolyglossiaEnvName(par_language): par_language->babel();
 634         string const prev_lang = use_polyglossia ?
 635                 getPolyglossiaEnvName(prev_language) : prev_language->babel();
 636         string const doc_lang = use_polyglossia ?
 637                 getPolyglossiaEnvName(doc_language) : doc_language->babel();
 638         string const outer_lang = use_polyglossia ?
 639                 getPolyglossiaEnvName(outer_language) : outer_language->babel();
 640         string lang_begin_command = use_polyglossia ?
 641                 "\\begin{$$lang}" : lyxrc.language_command_begin;
 642         string lang_end_command = use_polyglossia ?
 643                 "\\end{$$lang}" : lyxrc.language_command_end;
 644         // the '%' is necessary to prevent unwanted whitespace
 645         string lang_command_termination = "%\n";
 646
 647         // In some insets (such as Arguments), we cannot use \selectlanguage
 648         bool const localswitch = !use_polyglossia
 649                 && text.inset().getLayout().forcelocalfontswitch();
 650         if (localswitch) {
 651                 lang_begin_command = lyxrc.language_command_local;
 652                 lang_end_command = "}";
 653                 lang_command_termination.clear();
 654         }
 655
 656         if (par_lang != prev_lang
 657                 // check if we already put language command in TeXEnvironment()
 658                 && !(style.isEnvironment()
 659                      && (pit == 0 || (priorpar->layout() != par.layout()
 660                                           && priorpar->getDepth() <= par.getDepth())
 661                                   || priorpar->getDepth() < par.getDepth())))
 662         {
 663                 if (!lang_end_command.empty() &&
 664                     prev_lang != outer_lang &&
 665                     !prev_lang.empty())
 666                 {
 667                         os << from_ascii(subst(lang_end_command,
 668                                 "$$lang",
 669                                 prev_lang))
 670                            << lang_command_termination;
 671                 }
 672
 673                 // We need to open a new language if we couldn't close the previous
 674                 // one (because there's no language_command_end); and even if we closed
 675                 // the previous one, if the current language is different than the
 676                 // outer_language (which is currently in effect once the previous one
 677                 // is closed).
 678                 if ((lang_end_command.empty() || par_lang != outer_lang)
 679                         && !par_lang.empty()) {
 680                         // If we're inside an inset, and that inset is within an \L or \R
 681                         // (or equivalents), then within the inset, too, any opposite
 682                         // language paragraph should appear within an \L or \R (in addition
 683                         // to, outside of, the normal language switch commands).
 684                         // This behavior is not correct for ArabTeX, though.
 685                         if (!use_polyglossia
 686                             // not for ArabTeX
 687                                 && par_language->lang() != "arabic_arabtex"
 688                                 && outer_language->lang() != "arabic_arabtex"
 689                             // are we in an inset?
 690                             && runparams.local_font != 0
 691                             // is the inset within an \L or \R?
 692                             //
 693                             // FIXME: currently, we don't check this; this means that
 694                             // we'll have unnnecessary \L and \R commands, but that
 695                             // doesn't seem to hurt (though latex will complain)
 696                             //
 697                             // is this paragraph in the opposite direction?
 698                             && runparams.local_font->isRightToLeft() != par_language->rightToLeft()) {
 699                                 // FIXME: I don't have a working copy of the Arabi package, so
 700                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 701                                 // or not...
 702                                 if (par_language->lang() == "farsi")
 703                                         os << "\\textFR{";
 704                                 else if (outer_language->lang() == "farsi")
 705                                         os << "\\textLR{";
 706                                 else if (par_language->lang() == "arabic_arabi")
 707                                         os << "\\textAR{";
 708                                 else if (outer_language->lang() == "arabic_arabi")
 709                                         os << "\\textLR{";
 710                                 // remaining RTL languages currently is hebrew
 711                                 else if (par_language->rightToLeft())
 712                                         os << "\\R{";
 713                                 else
 714                                         os << "\\L{";
 715                         }
 716                         // With CJK, the CJK tag has to be closed first (see below)
 717                         if (runparams.encoding->package() != Encoding::CJK
 718                             && !par_lang.empty()) {
 719                                 os << from_ascii(subst(
 720                                         lang_begin_command,
 721                                         "$$lang",
 722                                         par_lang));
 723                                 if (use_polyglossia
 724                                     && !par_language->polyglossiaOpts().empty())
 725                                                 os << "["
 726                                                   << from_ascii(par_language->polyglossiaOpts())
 727                                                   << "]";
 728                                 os << lang_command_termination;
 729                         }
 730                 }
 731         }
 732
 733         // Switch file encoding if necessary; no need to do this for "default"
 734         // encoding, since this only affects the position of the outputted
 735         // \inputencoding command; the encoding switch will occur when necessary
 736         if (bparams.inputenc == "auto"
 737                 && runparams.encoding->package() != Encoding::none) {
 738                 // Look ahead for future encoding changes.
 739                 // We try to output them at the beginning of the paragraph,
 740                 // since the \inputencoding command is not allowed e.g. in
 741                 // sections. For this reason we only set runparams.moving_arg
 742                 // after checking for the encoding change, otherwise the
 743                 // change would be always avoided by switchEncoding().
 744                 for (pos_type i = 0; i < par.size(); ++i) {
 745                         char_type const c = par.getChar(i);
 746                         Encoding const * const encoding =
 747                                 par.getFontSettings(bparams, i).language()->encoding();
 748                         if (encoding->package() != Encoding::CJK
 749                                 && runparams.encoding->package() == Encoding::inputenc
 750                                 && isASCII(c))
 751                                 continue;
 752                         if (par.isInset(i))
 753                                 break;
 754                         // All characters before c are in the ASCII range, and
 755                         // c is non-ASCII (but no inset), so change the
 756                         // encoding to that required by the language of c.
 757                         // With CJK, only add switch if we have CJK content at the beginning
 758                         // of the paragraph
 759                         if (i != 0 && encoding->package() == Encoding::CJK)
 760                                 continue;
 761
 762                         pair<bool, int> enc_switch = switchEncoding(os.os(),
 763                                                 bparams, runparams, *encoding);
 764                         // the following is necessary after a CJK environment in a multilingual
 765                         // context (nesting issue).
 766                         if (par_language->encoding()->package() == Encoding::CJK
 767                                 && open_encoding_ != CJK && cjk_inherited_ == 0) {
 768                                 os << "\\begin{CJK}{" << from_ascii(par_language->encoding()->latexName())
 769                                    << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 770                                 open_encoding_ = CJK;
 771                         }
 772                         if (encoding->package() != Encoding::none && enc_switch.first) {
 773                                 if (enc_switch.second > 0) {
 774                                         // the '%' is necessary to prevent unwanted whitespace
 775                                         os << "%\n";
 776                                 }
 777                                 // With CJK, the CJK tag had to be closed first (see above)
 778                                 if (runparams.encoding->package() == Encoding::CJK
 779                                     && !par_lang.empty()) {
 780                                         os << from_ascii(subst(
 781                                                 lang_begin_command,
 782                                                 "$$lang",
 783                                                 par_lang))
 784                                         << lang_command_termination;
 785                                 }
 786                                 runparams.encoding = encoding;
 787                         }
 788                         break;
 789                 }
 790         }
 791
 792         runparams.moving_arg |= style.needprotect;
 793         Encoding const * const prev_encoding = runparams.encoding;
 794
 795         bool const useSetSpace = bparams.documentClass().provides("SetSpace");
 796         if (par.allowParagraphCustomization()) {
 797                 if (par.params().startOfAppendix()) {
 798                         os << "\\appendix\n";
 799                 }
 800
 801                 if (!par.params().spacing().isDefault()
 802                         && (pit == 0 || !priorpar->hasSameLayout(par)))
 803                 {
 804                         os << from_ascii(par.params().spacing().writeEnvirBegin(useSetSpace))
 805                             << '\n';
 806                 }
 807
 808                 if (style.isCommand()) {
 809                         os << '\n';
 810                 }
 811         }
 812
 813         parStartCommand(par, os, runparams, style);
 814         Font const outerfont = text.outerFont(pit);
 815
 816         // FIXME UNICODE
 817         os << from_utf8(everypar);
 818         par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 819
 820         // Make sure that \\par is done with the font of the last
 821         // character if this has another size as the default.
 822         // This is necessary because LaTeX (and LyX on the screen)
 823         // calculates the space between the baselines according
 824         // to this font. (Matthias)
 825         //
 826         // Is this really needed ? (Dekel)
 827         // We do not need to use to change the font for the last paragraph
 828         // or for a command.
 829
 830         Font const font = par.empty()
 831                  ? par.getLayoutFont(bparams, outerfont)
 832                  : par.getFont(bparams, par.size() - 1, outerfont);
 833
 834         bool const is_command = style.isCommand();
 835
 836         if (style.resfont.size() != font.fontInfo().size()
 837             && nextpar
 838             && !is_command) {
 839                 os << '{';
 840                 os << "\\" << from_ascii(font.latexSize()) << " \\par}";
 841         } else if (is_command) {
 842                 os << '}';
 843                 if (!style.postcommandargs().empty())
 844                         latexArgInsets(par, os, runparams, style.postcommandargs(), "post:");
 845                 if (runparams.encoding != prev_encoding) {
 846                         runparams.encoding = prev_encoding;
 847                         if (!runparams.isFullUnicode())
 848                                 os << setEncoding(prev_encoding->iconvName());
 849                 }
 850         }
 851
 852         bool pending_newline = false;
 853         bool unskip_newline = false;
 854         switch (style.latextype) {
 855         case LATEX_ITEM_ENVIRONMENT:
 856         case LATEX_LIST_ENVIRONMENT:
 857                 if (nextpar && (par.params().depth() < nextpar->params().depth()))
 858                         pending_newline = true;
 859                 break;
 860         case LATEX_ENVIRONMENT: {
 861                 // if its the last paragraph of the current environment
 862                 // skip it otherwise fall through
 863                 if (nextpar
 864                         && (nextpar->layout() != par.layout()
 865                         || nextpar->params().depth() != par.params().depth()))
 866                         break;
 867         }
 868
 869         // fall through possible
 870         default:
 871                 // we don't need it for the last paragraph!!!
 872                 if (nextpar)
 873                         pending_newline = true;
 874         }
 875
 876         if (par.allowParagraphCustomization()) {
 877                 if (!par.params().spacing().isDefault()
 878                         && (runparams.isLastPar || !nextpar->hasSameLayout(par))) {
 879                         if (pending_newline)
 880                                 os << '\n';
 881                         os << from_ascii(par.params().spacing().writeEnvirEnd(useSetSpace));
 882                         pending_newline = true;
 883                 }
 884         }
 885
 886         // Closing the language is needed for the last paragraph; it is also
 887         // needed if we're within an \L or \R that we may have opened above (not
 888         // necessarily in this paragraph) and are about to close.
 889         bool closing_rtl_ltr_environment = !use_polyglossia
 890                 // not for ArabTeX
 891                 && (par_language->lang() != "arabic_arabtex"
 892                     && outer_language->lang() != "arabic_arabtex")
 893                 // have we opened an \L or \R environment?
 894                 && runparams.local_font != 0
 895                 && runparams.local_font->isRightToLeft() != par_language->rightToLeft()
 896                 // are we about to close the language?
 897                 &&((nextpar && par_language->babel() != (nextpar->getParLanguage(bparams))->babel())
 898                    || (runparams.isLastPar && par_language->babel() != outer_language->babel()));
 899
 900         if (closing_rtl_ltr_environment
 901             || (runparams.isLastPar
 902                 && ((!use_polyglossia && par_language->babel() != outer_language->babel())
 903                     || (use_polyglossia && par_language->polyglossia() != outer_language->polyglossia())))) {
 904                 // Since \selectlanguage write the language to the aux file,
 905                 // we need to reset the language at the end of footnote or
 906                 // float.
 907
 908                 if (pending_newline)
 909                         os << '\n';
 910
 911                 // when the paragraph uses CJK, the language has to be closed earlier
 912                 if (font.language()->encoding()->package() != Encoding::CJK) {
 913                         if (lang_end_command.empty()) {
 914                                 // If this is a child, we should restore the
 915                                 // master language after the last paragraph.
 916                                 Language const * const current_language =
 917                                         (runparams.isLastPar && runparams.master_language)
 918                                                 ? runparams.master_language
 919                                                 : outer_language;
 920                                 string const current_lang = use_polyglossia
 921                                         ? getPolyglossiaEnvName(current_language)
 922                                         : current_language->babel();
 923                                 if (!current_lang.empty()) {
 924                                         os << from_ascii(subst(
 925                                                 lang_begin_command,
 926                                                 "$$lang",
 927                                                 current_lang));
 928                                         pending_newline = !localswitch;
 929                                         unskip_newline = !localswitch;
 930                                 }
 931                         } else if (!par_lang.empty()) {
 932                                 os << from_ascii(subst(
 933                                         lang_end_command,
 934                                         "$$lang",
 935                                         par_lang));
 936                                 pending_newline = !localswitch;
 937                                 unskip_newline = !localswitch;
 938                         }
 939                 }
 940         }
 941         if (closing_rtl_ltr_environment)
 942                 os << "}";
 943
 944         if (pending_newline) {
 945                 if (unskip_newline)
 946                         // prevent unwanted whitespace
 947                         os << '%';
 948                 os << '\n';
 949         }
 950
 951         // if this is a CJK-paragraph and the next isn't, close CJK
 952         // also if the next paragraph is a multilingual environment (because of nesting)
 953         if (nextpar
 954                 && open_encoding_ == CJK
 955                 && (nextpar->getParLanguage(bparams)->encoding()->package() != Encoding::CJK
 956                    || (nextpar->layout().isEnvironment() && nextpar->isMultiLingual(bparams)))
 957                 // inbetween environments, CJK has to be closed later (nesting!)
 958                 && (!style.isEnvironment() || !nextpar->layout().isEnvironment())) {
 959                 os << "\\end{CJK}\n";
 960                 open_encoding_ = none;
 961         }
 962
 963         // If this is the last paragraph, close the CJK environment
 964         // if necessary. If it's an environment, we'll have to \end that first.
 965         if (runparams.isLastPar && !style.isEnvironment()) {
 966                 switch (open_encoding_) {
 967                         case CJK: {
 968                                 // do nothing at the end of child documents
 969                                 if (maintext && buf.masterBuffer() != &buf)
 970                                         break;
 971                                 // end of main text
 972                                 if (maintext) {
 973                                         os << "\n\\end{CJK}\n";
 974                                 // end of an inset
 975                                 } else
 976                                         os << "\\end{CJK}";
 977                                 open_encoding_ = none;
 978                                 break;
 979                         }
 980                         case inputenc: {
 981                                 os << "\\egroup";
 982                                 open_encoding_ = none;
 983                                 break;
 984                         }
 985                         case none:
 986                         default:
 987                                 // do nothing
 988                                 break;
 989                 }
 990         }
 991
 992         // If this is the last paragraph, and a local_font was set upon entering
 993         // the inset, and we're using "auto" or "default" encoding, the encoding
 994         // should be set back to that local_font's encoding.
 995         // However, do not change the encoding when a fully unicode aware backend
 996         // such as XeTeX is used.
 997         if (runparams.isLastPar && runparams_in.local_font != 0
 998             && runparams_in.encoding != runparams_in.local_font->language()->encoding()
 999             && (bparams.inputenc == "auto" || bparams.inputenc == "default")
1000             && (!runparams.isFullUnicode())) {
1001                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
1002                 os << setEncoding(runparams_in.encoding->iconvName());
1003         }
1004         // Otherwise, the current encoding should be set for the next paragraph.
1005         else
1006                 runparams_in.encoding = runparams.encoding;
1007
1008
1009         // we don't need a newline for the last paragraph!!!
1010         // Note from JMarc: we will re-add a \n explicitly in
1011         // TeXEnvironment, because it is needed in this case
1012         if (nextpar) {
1013                 Layout const & next_layout = nextpar->layout();
1014                 if (style == next_layout
1015                     // no blank lines before environments!
1016                     || !next_layout.isEnvironment()
1017                     // unless there's a depth change
1018                     // FIXME What we really want to do here is put every \begin and \end
1019                     // tag on a new line (which was not the case with nested environments).
1020                     // But in the present state of play, we don't have access to the
1021                     // information whether the current TeX row is empty or not.
1022                     // For some ideas about how to fix this, see this thread:
1023                     // http://www.mail-archive.com/lyx-devel@lists.lyx.org/msg145787.html
1024                     || nextpar->params().depth() != par.params().depth()) {
1025                         os << '\n';
1026                 }
1027         }
1028
1029         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " done; ptr "
1030                 << &par << " next " << nextpar);
1031
1032         return;
1033 }
1034
1035
1036 // LaTeX all paragraphs
1037 void latexParagraphs(Buffer const & buf,
1038                      Text const & text,
1039                      otexstream & os,
1040                      OutputParams const & runparams,
1041                      string const & everypar)
1042 {
1043         LASSERT(runparams.par_begin <= runparams.par_end,
1044                 { os << "% LaTeX Output Error\n"; return; } );
1045
1046         BufferParams const & bparams = buf.params();
1047
1048         bool const maintext = text.isMainText();
1049         bool const is_child = buf.masterBuffer() != &buf;
1050
1051         // Open a CJK environment at the beginning of the main buffer
1052         // if the document's language is a CJK language
1053         // (but not in child documents)
1054         if (maintext && !is_child
1055             && bparams.encoding().package() == Encoding::CJK) {
1056                 os << "\\begin{CJK}{" << from_ascii(bparams.encoding().latexName())
1057                 << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
1058                 open_encoding_ = CJK;
1059         }
1060         // if "auto begin" is switched off, explicitly switch the
1061         // language on at start
1062         string const mainlang = runparams.use_polyglossia
1063                 ? getPolyglossiaEnvName(bparams.language)
1064                 : bparams.language->babel();
1065         string const lang_begin_command = runparams.use_polyglossia ?
1066                 "\\begin{$$lang}" : lyxrc.language_command_begin;
1067
1068         if (maintext && !lyxrc.language_auto_begin &&
1069             !mainlang.empty()) {
1070                 // FIXME UNICODE
1071                 os << from_utf8(subst(lang_begin_command,
1072                                         "$$lang",
1073                                         mainlang));
1074                 if (runparams.use_polyglossia
1075                     && !bparams.language->polyglossiaOpts().empty())
1076                         os << "["
1077                             << from_ascii(bparams.language->polyglossiaOpts())
1078                             << "]";
1079                 os << '\n';
1080         }
1081
1082         ParagraphList const & paragraphs = text.paragraphs();
1083
1084         if (runparams.par_begin == runparams.par_end) {
1085                 // The full doc will be exported but it is easier to just rely on
1086                 // runparams range parameters that will be passed TeXEnvironment.
1087                 runparams.par_begin = 0;
1088                 runparams.par_end = paragraphs.size();
1089         }
1090
1091         pit_type pit = runparams.par_begin;
1092         // lastpit is for the language check after the loop.
1093         pit_type lastpit = pit;
1094         // variables used in the loop:
1095         bool was_title = false;
1096         bool already_title = false;
1097         DocumentClass const & tclass = bparams.documentClass();
1098
1099         for (; pit < runparams.par_end; ++pit) {
1100                 lastpit = pit;
1101                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
1102
1103                 // FIXME This check should not be needed. We should
1104                 // perhaps issue an error if it is.
1105                 Layout const & layout = text.inset().forcePlainLayout() ?
1106                                 tclass.plainLayout() : par->layout();
1107
1108                 if (layout.intitle) {
1109                         if (already_title) {
1110                                 LYXERR0("Error in latexParagraphs: You"
1111                                         " should not mix title layouts"
1112                                         " with normal ones.");
1113                         } else if (!was_title) {
1114                                 was_title = true;
1115                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1116                                         os << "\\begin{"
1117                                                         << from_ascii(tclass.titlename())
1118                                                         << "}\n";
1119                                 }
1120                         }
1121                 } else if (was_title && !already_title) {
1122                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
1123                                 os << "\\end{" << from_ascii(tclass.titlename())
1124                                                 << "}\n";
1125                         }
1126                         else {
1127                                 os << "\\" << from_ascii(tclass.titlename())
1128                                                 << "\n";
1129                         }
1130                         already_title = true;
1131                         was_title = false;
1132                 }
1133
1134
1135                 if (!layout.isEnvironment() && par->params().leftIndent().zero()) {
1136                         // This is a standard top level paragraph, TeX it and continue.
1137                         TeXOnePar(buf, text, pit, os, runparams, everypar);
1138                         continue;
1139                 }
1140
1141                 TeXEnvironmentData const data =
1142                         prepareEnvironment(buf, text, par, os, runparams);
1143                 // pit can be changed in TeXEnvironment.
1144                 TeXEnvironment(buf, text, runparams, pit, os);
1145                 finishEnvironment(os, runparams, data);
1146         }
1147
1148         if (pit == runparams.par_end) {
1149                         // Make sure that the last paragraph is
1150                         // correctly terminated (because TeXOnePar does
1151                         // not add a \n in this case)
1152                         //os << '\n';
1153         }
1154
1155         // It might be that we only have a title in this document
1156         if (was_title && !already_title) {
1157                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1158                         os << "\\end{" << from_ascii(tclass.titlename())
1159                            << "}\n";
1160                 } else {
1161                         os << "\\" << from_ascii(tclass.titlename())
1162                            << "\n";
1163                 }
1164         }
1165
1166         // if "auto end" is switched off, explicitly close the language at the end
1167         // but only if the last par is in a babel language
1168         string const lang_end_command = runparams.use_polyglossia ?
1169                 "\\end{$$lang}" : lyxrc.language_command_end;
1170         if (maintext && !lyxrc.language_auto_end && !mainlang.empty() &&
1171                 paragraphs.at(lastpit).getParLanguage(bparams)->encoding()->package() != Encoding::CJK) {
1172                 os << from_utf8(subst(lang_end_command,
1173                                         "$$lang",
1174                                         mainlang))
1175                         << '\n';
1176         }
1177
1178         // If the last paragraph is an environment, we'll have to close
1179         // CJK at the very end to do proper nesting.
1180         if (maintext && !is_child && open_encoding_ == CJK) {
1181                 os << "\\end{CJK}\n";
1182                 open_encoding_ = none;
1183         }
1184
1185         // reset inherited encoding
1186         if (cjk_inherited_ > 0) {
1187                 cjk_inherited_ -= 1;
1188                 if (cjk_inherited_ == 0)
1189                         open_encoding_ = CJK;
1190         }
1191 }
1192
1193
1194 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
1195                    OutputParams const & runparams, Encoding const & newEnc,
1196                    bool force)
1197 {
1198         Encoding const & oldEnc = *runparams.encoding;
1199         bool moving_arg = runparams.moving_arg;
1200         // If we switch from/to CJK, we need to switch anyway, despite custom inputenc
1201         bool const from_to_cjk =
1202                 (oldEnc.package() == Encoding::CJK && newEnc.package() != Encoding::CJK)
1203                 || (oldEnc.package() != Encoding::CJK && newEnc.package() == Encoding::CJK);
1204         if (!force && !from_to_cjk
1205             && ((bparams.inputenc != "auto" && bparams.inputenc != "default") || moving_arg))
1206                 return make_pair(false, 0);
1207
1208         // Do nothing if the encoding is unchanged.
1209         if (oldEnc.name() == newEnc.name())
1210                 return make_pair(false, 0);
1211
1212         // FIXME We ignore encoding switches from/to encodings that do
1213         // neither support the inputenc package nor the CJK package here.
1214         // This does of course only work in special cases (e.g. switch from
1215         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
1216         // but it is the best we can do
1217         if (oldEnc.package() == Encoding::none
1218                 || newEnc.package() == Encoding::none)
1219                 return make_pair(false, 0);
1220
1221         LYXERR(Debug::LATEX, "Changing LaTeX encoding from "
1222                 << oldEnc.name() << " to " << newEnc.name());
1223         os << setEncoding(newEnc.iconvName());
1224         if (bparams.inputenc == "default")
1225                 return make_pair(true, 0);
1226
1227         docstring const inputenc_arg(from_ascii(newEnc.latexName()));
1228         switch (newEnc.package()) {
1229                 case Encoding::none:
1230                 case Encoding::japanese:
1231                         // shouldn't ever reach here, see above
1232                         return make_pair(true, 0);
1233                 case Encoding::inputenc: {
1234                         int count = inputenc_arg.length();
1235                         if (oldEnc.package() == Encoding::CJK &&
1236                             open_encoding_ == CJK) {
1237                                 os << "\\end{CJK}";
1238                                 open_encoding_ = none;
1239                                 count += 9;
1240                         }
1241                         else if (oldEnc.package() == Encoding::inputenc &&
1242                                  open_encoding_ == inputenc) {
1243                                 os << "\\egroup";
1244                                 open_encoding_ = none;
1245                                 count += 7;
1246                         }
1247                         if (runparams.local_font != 0
1248                             &&  oldEnc.package() == Encoding::CJK) {
1249                                 // within insets, \inputenc switches need
1250                                 // to be embraced within \bgroup...\egroup;
1251                                 // else CJK fails.
1252                                 os << "\\bgroup";
1253                                 count += 7;
1254                                 open_encoding_ = inputenc;
1255                         }
1256                         // with the japanese option, inputenc is omitted.
1257                         if (runparams.use_japanese)
1258                                 return make_pair(true, count);
1259                         os << "\\inputencoding{" << inputenc_arg << '}';
1260                         return make_pair(true, count + 16);
1261                 }
1262                 case Encoding::CJK: {
1263                         int count = inputenc_arg.length();
1264                         if (oldEnc.package() == Encoding::CJK &&
1265                             open_encoding_ == CJK) {
1266                                 os << "\\end{CJK}";
1267                                 count += 9;
1268                         }
1269                         if (oldEnc.package() == Encoding::inputenc &&
1270                             open_encoding_ == inputenc) {
1271                                 os << "\\egroup";
1272                                 count += 7;
1273                         }
1274                         os << "\\begin{CJK}{" << inputenc_arg << "}{"
1275                            << from_ascii(bparams.fonts_cjk) << "}";
1276                         open_encoding_ = CJK;
1277                         return make_pair(true, count + 15);
1278                 }
1279         }
1280         // Dead code to avoid a warning:
1281         return make_pair(true, 0);
1282
1283 }
1284
1285 } // namespace lyx