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/debug.h"
  34 #include "support/lstrings.h"
  35
  36 #include <boost/next_prior.hpp>
  37 #include <list>
  38
  39 using namespace std;
  40 using namespace lyx::support;
  41
  42
  43 namespace lyx {
  44
  45 namespace {
  46
  47 enum OpenEncoding {
  48                 none,
  49                 inputenc,
  50                 CJK
  51 };
  52
  53 static int open_encoding_ = none;
  54 static int cjk_inherited_ = 0;
  55 Language const * prev_env_language_ = 0;
  56
  57
  58 string const getPolyglossiaEnvName(Language const * lang)
  59 {
  60         string result = lang->polyglossia();
  61         if (result == "arabic")
  62                 // exceptional spelling; see polyglossia docs.
  63                 result = "Arabic";
  64         return result;
  65 }
  66
  67
  68 struct TeXEnvironmentData
  69 {
  70         bool cjk_nested;
  71         Layout const * style;
  72         Language const * par_language;
  73         Encoding const * prev_encoding;
  74         bool leftindent_open;
  75 };
  76
  77
  78 static TeXEnvironmentData prepareEnvironment(Buffer const & buf,
  79                                         Text const & text,
  80                                         ParagraphList::const_iterator pit,
  81                                         otexstream & os,
  82                                         OutputParams const & runparams)
  83 {
  84         TeXEnvironmentData data;
  85
  86         BufferParams const & bparams = buf.params();
  87
  88         // FIXME This test should not be necessary.
  89         // We should perhaps issue an error if it is.
  90         Layout const & style = text.inset().forcePlainLayout() ?
  91                 bparams.documentClass().plainLayout() : pit->layout();
  92
  93         ParagraphList const & paragraphs = text.paragraphs();
  94         ParagraphList::const_iterator const priorpit =
  95                 pit == paragraphs.begin() ? pit : boost::prior(pit);
  96
  97         bool const use_prev_env_language = prev_env_language_ != 0
  98                         && priorpit->layout().isEnvironment()
  99                         && (priorpit->getDepth() > pit->getDepth()
 100                             || (priorpit->getDepth() == pit->getDepth()
 101                                 && priorpit->layout() != pit->layout()));
 102
 103         data.prev_encoding = runparams.encoding;
 104         data.par_language = pit->getParLanguage(bparams);
 105         Language const * const doc_language = bparams.language;
 106         Language const * const prev_par_language =
 107                 (pit != paragraphs.begin())
 108                 ? (use_prev_env_language ? prev_env_language_
 109                                          : priorpit->getParLanguage(bparams))
 110                 : doc_language;
 111
 112         bool const use_pg = runparams.use_polyglossia;
 113         string const par_lang = use_pg ?
 114                 getPolyglossiaEnvName(data.par_language) : data.par_language->babel();
 115         string const prev_par_lang = use_pg ?
 116                 getPolyglossiaEnvName(prev_par_language) : prev_par_language->babel();
 117         string const doc_lang = use_pg ?
 118                 getPolyglossiaEnvName(doc_language) : doc_language->babel();
 119         string const lang_begin_command = use_pg ?
 120                 "\\begin{$$lang}" : lyxrc.language_command_begin;
 121         string const lang_end_command = use_pg ?
 122                 "\\end{$$lang}" : lyxrc.language_command_end;
 123
 124         if (par_lang != prev_par_lang) {
 125                 if (!lang_end_command.empty() &&
 126                     prev_par_lang != doc_lang &&
 127                     !prev_par_lang.empty()) {
 128                         os << from_ascii(subst(
 129                                 lang_end_command,
 130                                 "$$lang",
 131                                 prev_par_lang))
 132                           // the '%' is necessary to prevent unwanted whitespace
 133                           << "%\n";
 134                 }
 135
 136                 if ((lang_end_command.empty() ||
 137                     par_lang != doc_lang) &&
 138                     !par_lang.empty()) {
 139                         os << from_ascii(subst(
 140                                 lang_begin_command,
 141                                 "$$lang",
 142                                 par_lang));
 143                         if (runparams.use_polyglossia
 144                             && !data.par_language->polyglossiaOpts().empty())
 145                                         os << "["
 146                                            << from_ascii(data.par_language->polyglossiaOpts())
 147                                            << "]";
 148                           // the '%' is necessary to prevent unwanted whitespace
 149                         os << "%\n";
 150                 }
 151         }
 152
 153         data.leftindent_open = false;
 154         if (!pit->params().leftIndent().zero()) {
 155                 os << "\\begin{LyXParagraphLeftIndent}{"
 156                    << from_ascii(pit->params().leftIndent().asLatexString())
 157                    << "}\n";
 158                 data.leftindent_open = true;
 159         }
 160
 161         if (style.isEnvironment()) {
 162                 os << "\\begin{" << from_ascii(style.latexname()) << '}';
 163                 if (style.optargs != 0 || style.reqargs != 0)
 164                         latexArgInsets(*pit, os, runparams, style.reqargs, style.optargs);
 165                 if (style.latextype == LATEX_LIST_ENVIRONMENT) {
 166                         os << '{'
 167                            << pit->params().labelWidthString()
 168                            << "}\n";
 169                 } else if (style.labeltype == LABEL_BIBLIO) {
 170                         if (pit->params().labelWidthString().empty())
 171                                 os << '{' << bibitemWidest(buf, runparams) << "}\n";
 172                         else
 173                                 os << '{'
 174                                   << pit->params().labelWidthString()
 175                                   << "}\n";
 176                 } else
 177                         os << from_ascii(style.latexparam()) << '\n';
 178         }
 179         data.style = &style;
 180
 181         // in multilingual environments, the CJK tags have to be nested properly
 182         data.cjk_nested = false;
 183         if (data.par_language->encoding()->package() == Encoding::CJK &&
 184             open_encoding_ != CJK && pit->isMultiLingual(bparams)) {
 185                 if (prev_par_language->encoding()->package() == Encoding::CJK)
 186                         os << "\\begin{CJK}{" << from_ascii(data.par_language->encoding()->latexName())
 187                            << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 188                 open_encoding_ = CJK;
 189                 data.cjk_nested = true;
 190         }
 191         return data;
 192 }
 193
 194
 195 static void finishEnvironment(otexstream & os, OutputParams const & runparams,
 196                                TeXEnvironmentData const & data)
 197 {
 198         if (open_encoding_ == CJK && data.cjk_nested) {
 199                 // We need to close the encoding even if it does not change
 200                 // to do correct environment nesting
 201                 os << "\\end{CJK}\n";
 202                 open_encoding_ = none;
 203         }
 204
 205         if (data.style->isEnvironment()) {
 206                 os << "\\end{" << from_ascii(data.style->latexname()) << "}\n";
 207                 prev_env_language_ = data.par_language;
 208                 if (runparams.encoding != data.prev_encoding) {
 209                         runparams.encoding = data.prev_encoding;
 210                         if (!runparams.isFullUnicode())
 211                                 os << setEncoding(data.prev_encoding->iconvName());
 212                 }
 213         }
 214
 215         if (data.leftindent_open) {
 216                 os << "\\end{LyXParagraphLeftIndent}\n";
 217                 prev_env_language_ = data.par_language;
 218                 if (runparams.encoding != data.prev_encoding) {
 219                         runparams.encoding = data.prev_encoding;
 220                         if (!runparams.isFullUnicode())
 221                                 os << setEncoding(data.prev_encoding->iconvName());
 222                 }
 223         }
 224 }
 225
 226
 227 void TeXEnvironment(Buffer const & buf, Text const & text,
 228                     OutputParams const & runparams,
 229                     pit_type & pit, otexstream & os)
 230 {
 231         ParagraphList const & paragraphs = text.paragraphs();
 232         ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 233         LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << pit);
 234
 235         Layout const & current_layout = par->layout();
 236         depth_type const current_depth = par->params().depth();
 237         Length const & current_left_indent = par->params().leftIndent();
 238
 239         // This is for debugging purpose at the end.
 240         pit_type const par_begin = pit;
 241         for (; pit < runparams.par_end; ++pit) {
 242                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 243
 244                 // check first if this is an higher depth paragraph.
 245                 bool go_out = (par->params().depth() < current_depth);
 246                 if (par->params().depth() == current_depth) {
 247                         // This environment is finished.
 248                         go_out |= (par->layout() != current_layout);
 249                         go_out |= (par->params().leftIndent() != current_left_indent);
 250                 }
 251                 if (go_out) {
 252                         // nothing to do here, restore pit and go out.
 253                         pit--;
 254                         break;
 255                 }
 256
 257                 if (par->layout() == current_layout
 258                         && par->params().depth() == current_depth
 259                         && par->params().leftIndent() == current_left_indent) {
 260                         // We are still in the same environment so TeXOnePar and continue;
 261                         TeXOnePar(buf, text, pit, os, runparams);
 262                         continue;
 263                 }
 264
 265                 // We are now in a deeper environment.
 266                 // Either par->layout() != current_layout
 267                 // Or     par->params().depth() > current_depth
 268                 // Or     par->params().leftIndent() != current_left_indent)
 269
 270                 if (par->layout().isParagraph()) {
 271                         // FIXME (Lgb): How to handle this?
 272                         //&& !suffixIs(os, "\n\n")
 273
 274                         // (ARRae) There should be at least one '\n' already but we need there to
 275                         // be two for Standard paragraphs that are depth-increment'ed to be
 276                         // output correctly. However, tables can also be paragraphs so
 277                         // don't adjust them.
 278
 279                         // FIXME (Lgb): Will it ever harm to have one '\n' too
 280                         // many? i.e. that we sometimes will have
 281                         // three in a row.
 282                         os << '\n';
 283                 }
 284
 285                 // FIXME This test should not be necessary.
 286                 // We should perhaps issue an error if it is.
 287                 bool const force_plain_layout = text.inset().forcePlainLayout();
 288                 Layout const & style = force_plain_layout
 289                         ? buf.params().documentClass().plainLayout()
 290                         : par->layout();
 291
 292                 if (!style.isEnvironment()) {
 293                         // This is a standard paragraph, no need to call TeXEnvironment.
 294                         TeXOnePar(buf, text, pit, os, runparams);
 295                         continue;
 296                 }
 297
 298                 // This is a new environment.
 299                 TeXEnvironmentData const data =
 300                         prepareEnvironment(buf, text, par, os, runparams);
 301                 // Recursive call to TeXEnvironment!
 302                 TeXEnvironment(buf, text, runparams, pit, os);
 303                 finishEnvironment(os, runparams, data);
 304         }
 305
 306         if (pit != runparams.par_end)
 307                 LYXERR(Debug::LATEX, "TeXEnvironment for paragraph " << par_begin << " done.");
 308 }
 309
 310 } // namespace anon
 311
 312
 313 void latexArgInsets(Paragraph const & par, otexstream & os,
 314         OutputParams const & runparams, unsigned int reqargs,
 315         unsigned int optargs)
 316 {
 317         unsigned int totalargs = reqargs + optargs;
 318         list<InsetArgument const *> ilist;
 319
 320         InsetList::const_iterator it = par.insetList().begin();
 321         InsetList::const_iterator end = par.insetList().end();
 322         for (; it != end; ++it) {
 323                 if (it->inset->lyxCode() == ARG_CODE) {
 324                         if (ilist.size() >= totalargs) {
 325                                 LYXERR0("WARNING: Found extra argument inset.");
 326                                 continue;
 327                         }
 328                         InsetArgument const * ins =
 329                                 static_cast<InsetArgument const *>(it->inset);
 330                         ilist.push_back(ins);
 331                 }
 332         }
 333
 334         if (!reqargs && ilist.empty())
 335                 return;
 336
 337         bool const have_optional_args = ilist.size() > reqargs;
 338         if (have_optional_args) {
 339                 unsigned int todo = ilist.size() - reqargs;
 340                 for (unsigned int i = 0; i < todo; ++i) {
 341                         InsetArgument const * ins = ilist.front();
 342                         ilist.pop_front();
 343                         ins->latexArgument(os, runparams, true);
 344                 }
 345         }
 346
 347         // we should now have no more insets than there are required
 348         // arguments.
 349         LASSERT(ilist.size() <= reqargs, /* */);
 350         if (!reqargs)
 351                 return;
 352
 353         for (unsigned int i = 0; i < reqargs; ++i) {
 354                 if (ilist.empty())
 355                         // a required argument wasn't given, so we output {}
 356                         os << "{}";
 357                 else {
 358                         InsetArgument const * ins = ilist.front();
 359                         ilist.pop_front();
 360                         ins->latexArgument(os, runparams, false);
 361                 }
 362         }
 363 }
 364
 365 namespace {
 366
 367 // output the proper paragraph start according to latextype.
 368 void parStartCommand(Paragraph const & par, otexstream & os,
 369                      OutputParams const & runparams, Layout const & style)
 370 {
 371         switch (style.latextype) {
 372         case LATEX_COMMAND:
 373                 os << '\\' << from_ascii(style.latexname());
 374
 375                 // Separate handling of optional argument inset.
 376                 if (style.optargs != 0 || style.reqargs != 0)
 377                         latexArgInsets(par, os, runparams, style.reqargs, style.optargs);
 378                 else
 379                         os << from_ascii(style.latexparam());
 380                 break;
 381         case LATEX_ITEM_ENVIRONMENT:
 382         case LATEX_LIST_ENVIRONMENT:
 383                 os << "\\item ";
 384                 break;
 385         case LATEX_BIB_ENVIRONMENT:
 386                 // ignore this, the inset will write itself
 387                 break;
 388         default:
 389                 break;
 390         }
 391 }
 392
 393 } // namespace anon
 394
 395 // FIXME: this should be anonymous
 396 void TeXOnePar(Buffer const & buf,
 397                Text const & text,
 398                pit_type pit,
 399                otexstream & os,
 400                OutputParams const & runparams_in,
 401                string const & everypar,
 402                int start_pos, int end_pos)
 403 {
 404         BufferParams const & bparams = buf.params();
 405         ParagraphList const & paragraphs = text.paragraphs();
 406         Paragraph const & par = paragraphs.at(pit);
 407         // FIXME This check should not really be needed.
 408         // Perhaps we should issue an error if it is.
 409         Layout const style = text.inset().forcePlainLayout() ?
 410                 bparams.documentClass().plainLayout() : par.layout();
 411
 412         if (style.inpreamble)
 413                 return;
 414
 415         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " ptr " << &par << " '"
 416                 << everypar << "'");
 417
 418         OutputParams runparams = runparams_in;
 419         runparams.isLastPar = (pit == pit_type(paragraphs.size() - 1));
 420         // We reinitialze par begin and end to be on the safe side
 421         // with embedded inset as we don't know if they set those
 422         // value correctly.
 423         runparams.par_begin = 0;
 424         runparams.par_end = 0;
 425
 426         bool const maintext = text.isMainText();
 427         // we are at the beginning of an inset and CJK is already open;
 428         // we count inheritation levels to get the inset nesting right.
 429         if (pit == 0 && !maintext
 430             && (cjk_inherited_ > 0 || open_encoding_ == CJK)) {
 431                 cjk_inherited_ += 1;
 432                 open_encoding_ = none;
 433         }
 434
 435         if (text.inset().getLayout().isPassThru()) {
 436                 Font const outerfont = text.outerFont(pit);
 437
 438                 // No newline before first paragraph in this lyxtext
 439                 if (pit > 0) {
 440                         os << '\n';
 441                         if (!text.inset().getLayout().parbreakIsNewline())
 442                                 os << '\n';
 443                 }
 444
 445                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 446                 return;
 447         }
 448
 449         Paragraph const * nextpar = runparams.isLastPar
 450                 ? 0 : &paragraphs.at(pit + 1);
 451
 452         if (style.pass_thru) {
 453                 Font const outerfont = text.outerFont(pit);
 454                 parStartCommand(par, os, runparams, style);
 455
 456                 par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 457
 458                 // I did not create a parEndCommand for this minuscule
 459                 // task because in the other user of parStartCommand
 460                 // the code is different (JMarc)
 461                 if (style.isCommand())
 462                         os << "}\n";
 463                 else
 464                         os << '\n';
 465                 if (!style.parbreak_is_newline) {
 466                         os << '\n';
 467                 } else if (nextpar) {
 468                         Layout const nextstyle = text.inset().forcePlainLayout()
 469                                 ? bparams.documentClass().plainLayout()
 470                                 : nextpar->layout();
 471                         if (nextstyle.name() != style.name())
 472                                 os << '\n';
 473                 }
 474
 475                 return;
 476         }
 477
 478         // This paragraph's language
 479         Language const * const par_language = par.getParLanguage(bparams);
 480         // The document's language
 481         Language const * const doc_language = bparams.language;
 482         // The language that was in effect when the environment this paragraph is
 483         // inside of was opened
 484         Language const * const outer_language =
 485                 (runparams.local_font != 0) ?
 486                         runparams.local_font->language() : doc_language;
 487
 488         Paragraph const * priorpar = (pit == 0) ? 0 : &paragraphs.at(pit - 1);
 489
 490         // The previous language that was in effect is the language of the
 491         // previous paragraph, unless the previous paragraph is inside an
 492         // environment with nesting depth greater than (or equal to, but with
 493         // a different layout) the current one. If there is no previous
 494         // paragraph, the previous language is the outer language.
 495         bool const use_prev_env_language = prev_env_language_ != 0
 496                         && priorpar
 497                         && priorpar->layout().isEnvironment()
 498                         && (priorpar->getDepth() > par.getDepth()
 499                             || (priorpar->getDepth() == par.getDepth()
 500                                     && priorpar->layout() != par.layout()));
 501         Language const * const prev_language =
 502                 (pit != 0)
 503                 ? (use_prev_env_language ? prev_env_language_
 504                                          : priorpar->getParLanguage(bparams))
 505                 : outer_language;
 506
 507
 508         bool const use_pg = runparams.use_polyglossia;
 509         string const par_lang = use_pg ?
 510                 getPolyglossiaEnvName(par_language): par_language->babel();
 511         string const prev_lang = use_pg ?
 512                 getPolyglossiaEnvName(prev_language) : prev_language->babel();
 513         string const doc_lang = use_pg ?
 514                 getPolyglossiaEnvName(doc_language) : doc_language->babel();
 515         string const outer_lang = use_pg ?
 516                 getPolyglossiaEnvName(outer_language) : outer_language->babel();
 517         string const lang_begin_command = use_pg ?
 518                 "\\begin{$$lang}" : lyxrc.language_command_begin;
 519         string const lang_end_command = use_pg ?
 520                 "\\end{$$lang}" : lyxrc.language_command_end;
 521
 522         if (par_lang != prev_lang
 523                 // check if we already put language command in TeXEnvironment()
 524                 && !(style.isEnvironment()
 525                      && (pit == 0 || (priorpar->layout() != par.layout()
 526                                           && priorpar->getDepth() <= par.getDepth())
 527                                   || priorpar->getDepth() < par.getDepth())))
 528         {
 529                 if (!lang_end_command.empty() &&
 530                     prev_lang != outer_lang &&
 531                     !prev_lang.empty())
 532                 {
 533                         os << from_ascii(subst(lang_end_command,
 534                                 "$$lang",
 535                                 prev_lang))
 536                            // the '%' is necessary to prevent unwanted whitespace
 537                            << "%\n";
 538                 }
 539
 540                 // We need to open a new language if we couldn't close the previous
 541                 // one (because there's no language_command_end); and even if we closed
 542                 // the previous one, if the current language is different than the
 543                 // outer_language (which is currently in effect once the previous one
 544                 // is closed).
 545                 if ((lang_end_command.empty() || par_lang != outer_lang)
 546                         && !par_lang.empty()) {
 547                         // If we're inside an inset, and that inset is within an \L or \R
 548                         // (or equivalents), then within the inset, too, any opposite
 549                         // language paragraph should appear within an \L or \R (in addition
 550                         // to, outside of, the normal language switch commands).
 551                         // This behavior is not correct for ArabTeX, though.
 552                         if (!runparams.use_polyglossia
 553                             // not for ArabTeX
 554                                 && par_language->lang() != "arabic_arabtex"
 555                                 && outer_language->lang() != "arabic_arabtex"
 556                             // are we in an inset?
 557                             && runparams.local_font != 0
 558                             // is the inset within an \L or \R?
 559                             //
 560                             // FIXME: currently, we don't check this; this means that
 561                             // we'll have unnnecessary \L and \R commands, but that
 562                             // doesn't seem to hurt (though latex will complain)
 563                             //
 564                             // is this paragraph in the opposite direction?
 565                             && runparams.local_font->isRightToLeft() != par_language->rightToLeft()) {
 566                                 // FIXME: I don't have a working copy of the Arabi package, so
 567                                 // I'm not sure if the farsi and arabic_arabi stuff is correct
 568                                 // or not...
 569                                 if (par_language->lang() == "farsi")
 570                                         os << "\\textFR{";
 571                                 else if (outer_language->lang() == "farsi")
 572                                         os << "\\textLR{";
 573                                 else if (par_language->lang() == "arabic_arabi")
 574                                         os << "\\textAR{";
 575                                 else if (outer_language->lang() == "arabic_arabi")
 576                                         os << "\\textLR{";
 577                                 // remaining RTL languages currently is hebrew
 578                                 else if (par_language->rightToLeft())
 579                                         os << "\\R{";
 580                                 else
 581                                         os << "\\L{";
 582                         }
 583                         // With CJK, the CJK tag has to be closed first (see below)
 584                         if (runparams.encoding->package() != Encoding::CJK) {
 585                                 os << from_ascii(subst(
 586                                         lang_begin_command,
 587                                         "$$lang",
 588                                         par_lang));
 589                                 if (runparams.use_polyglossia
 590                                     && !par_language->polyglossiaOpts().empty())
 591                                                 os << "["
 592                                                   << from_ascii(par_language->polyglossiaOpts())
 593                                                   << "]";
 594                                    // the '%' is necessary to prevent unwanted whitespace
 595                                 os << "%\n";
 596                         }
 597                 }
 598         }
 599
 600         // Switch file encoding if necessary; no need to do this for "default"
 601         // encoding, since this only affects the position of the outputted
 602         // \inputencoding command; the encoding switch will occur when necessary
 603         if (bparams.inputenc == "auto"
 604                 && runparams.encoding->package() != Encoding::none) {
 605                 // Look ahead for future encoding changes.
 606                 // We try to output them at the beginning of the paragraph,
 607                 // since the \inputencoding command is not allowed e.g. in
 608                 // sections. For this reason we only set runparams.moving_arg
 609                 // after checking for the encoding change, otherwise the
 610                 // change would be always avoided by switchEncoding().
 611                 for (pos_type i = 0; i < par.size(); ++i) {
 612                         char_type const c = par.getChar(i);
 613                         Encoding const * const encoding =
 614                                 par.getFontSettings(bparams, i).language()->encoding();
 615                         if (encoding->package() != Encoding::CJK
 616                                 && runparams.encoding->package() == Encoding::inputenc
 617                                 && c < 0x80)
 618                                 continue;
 619                         if (par.isInset(i))
 620                                 break;
 621                         // All characters before c are in the ASCII range, and
 622                         // c is non-ASCII (but no inset), so change the
 623                         // encoding to that required by the language of c.
 624                         // With CJK, only add switch if we have CJK content at the beginning
 625                         // of the paragraph
 626                         if (i != 0 && encoding->package() == Encoding::CJK)
 627                                 continue;
 628
 629                         pair<bool, int> enc_switch = switchEncoding(os.os(),
 630                                                 bparams, runparams, *encoding);
 631                         // the following is necessary after a CJK environment in a multilingual
 632                         // context (nesting issue).
 633                         if (par_language->encoding()->package() == Encoding::CJK
 634                                 && open_encoding_ != CJK && cjk_inherited_ == 0) {
 635                                 os << "\\begin{CJK}{" << from_ascii(par_language->encoding()->latexName())
 636                                    << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 637                                 open_encoding_ = CJK;
 638                         }
 639                         if (encoding->package() != Encoding::none && enc_switch.first) {
 640                                 if (enc_switch.second > 0) {
 641                                         // the '%' is necessary to prevent unwanted whitespace
 642                                         os << "%\n";
 643                                 }
 644                                 // With CJK, the CJK tag had to be closed first (see above)
 645                                 if (runparams.encoding->package() == Encoding::CJK) {
 646                                         os << from_ascii(subst(
 647                                                 lang_begin_command,
 648                                                 "$$lang",
 649                                                 par_lang))
 650                                         // the '%' is necessary to prevent unwanted whitespace
 651                                         << "%\n";
 652                                 }
 653                                 runparams.encoding = encoding;
 654                         }
 655                         break;
 656                 }
 657         }
 658
 659         runparams.moving_arg |= style.needprotect;
 660         Encoding const * const prev_encoding = runparams.encoding;
 661
 662         bool const useSetSpace = bparams.documentClass().provides("SetSpace");
 663         if (par.allowParagraphCustomization()) {
 664                 if (par.params().startOfAppendix()) {
 665                         os << "\\appendix\n";
 666                 }
 667
 668                 if (!par.params().spacing().isDefault()
 669                         && (pit == 0 || !priorpar->hasSameLayout(par)))
 670                 {
 671                         os << from_ascii(par.params().spacing().writeEnvirBegin(useSetSpace))
 672                             << '\n';
 673                 }
 674
 675                 if (style.isCommand()) {
 676                         os << '\n';
 677                 }
 678         }
 679
 680         parStartCommand(par, os, runparams, style);
 681
 682         Font const outerfont = text.outerFont(pit);
 683
 684         // FIXME UNICODE
 685         os << from_utf8(everypar);
 686         par.latex(bparams, outerfont, os, runparams, start_pos, end_pos);
 687
 688         // Make sure that \\par is done with the font of the last
 689         // character if this has another size as the default.
 690         // This is necessary because LaTeX (and LyX on the screen)
 691         // calculates the space between the baselines according
 692         // to this font. (Matthias)
 693         //
 694         // Is this really needed ? (Dekel)
 695         // We do not need to use to change the font for the last paragraph
 696         // or for a command.
 697
 698         Font const font = par.empty()
 699                  ? par.getLayoutFont(bparams, outerfont)
 700                  : par.getFont(bparams, par.size() - 1, outerfont);
 701
 702         bool const is_command = style.isCommand();
 703
 704         if (style.resfont.size() != font.fontInfo().size()
 705             && nextpar
 706             && !is_command) {
 707                 os << '{';
 708                 os << "\\" << from_ascii(font.latexSize()) << " \\par}";
 709         } else if (is_command) {
 710                 os << '}';
 711                 if (runparams.encoding != prev_encoding) {
 712                         runparams.encoding = prev_encoding;
 713                         if (!runparams.isFullUnicode())
 714                                 os << setEncoding(prev_encoding->iconvName());
 715                 }
 716         }
 717
 718         bool pending_newline = false;
 719         bool unskip_newline = false;
 720         switch (style.latextype) {
 721         case LATEX_ITEM_ENVIRONMENT:
 722         case LATEX_LIST_ENVIRONMENT:
 723                 if (nextpar && (par.params().depth() < nextpar->params().depth()))
 724                         pending_newline = true;
 725                 break;
 726         case LATEX_ENVIRONMENT: {
 727                 // if its the last paragraph of the current environment
 728                 // skip it otherwise fall through
 729                 if (nextpar
 730                         && (nextpar->layout() != par.layout()
 731                         || nextpar->params().depth() != par.params().depth()))
 732                         break;
 733         }
 734
 735         // fall through possible
 736         default:
 737                 // we don't need it for the last paragraph!!!
 738                 if (nextpar)
 739                         pending_newline = true;
 740         }
 741
 742         if (par.allowParagraphCustomization()) {
 743                 if (!par.params().spacing().isDefault()
 744                         && (runparams.isLastPar || !nextpar->hasSameLayout(par))) {
 745                         if (pending_newline)
 746                                 os << '\n';
 747                         os << from_ascii(par.params().spacing().writeEnvirEnd(useSetSpace));
 748                         pending_newline = true;
 749                 }
 750         }
 751
 752         // Closing the language is needed for the last paragraph; it is also
 753         // needed if we're within an \L or \R that we may have opened above (not
 754         // necessarily in this paragraph) and are about to close.
 755         bool closing_rtl_ltr_environment = !runparams.use_polyglossia
 756                 // not for ArabTeX
 757                 && (par_language->lang() != "arabic_arabtex"
 758                     && outer_language->lang() != "arabic_arabtex")
 759                      // have we opened and \L or \R environment?
 760                 && runparams.local_font != 0
 761                 && runparams.local_font->isRightToLeft() != par_language->rightToLeft()
 762                 // are we about to close the language?
 763                 &&((nextpar && par_language->babel() != (nextpar->getParLanguage(bparams))->babel())
 764                    || (runparams.isLastPar && par_language->babel() != outer_language->babel()));
 765
 766         if (closing_rtl_ltr_environment
 767                 || (runparams.isLastPar && par_language->babel() != outer_language->babel())) {
 768                 // Since \selectlanguage write the language to the aux file,
 769                 // we need to reset the language at the end of footnote or
 770                 // float.
 771
 772                 if (pending_newline)
 773                         os << '\n';
 774
 775                 // when the paragraph uses CJK, the language has to be closed earlier
 776                 if (font.language()->encoding()->package() != Encoding::CJK) {
 777                         if (lang_end_command.empty()) {
 778                                 // If this is a child, we should restore the
 779                                 // master language after the last paragraph.
 780                                 Language const * const current_language =
 781                                         (runparams.isLastPar && runparams.master_language)
 782                                                 ? runparams.master_language
 783                                                 : outer_language;
 784                                 string const current_lang = runparams.use_polyglossia
 785                                         ? getPolyglossiaEnvName(current_language)
 786                                         : current_language->babel();
 787                                 if (!current_lang.empty()) {
 788                                         os << from_ascii(subst(
 789                                                 lang_begin_command,
 790                                                 "$$lang",
 791                                                 current_lang));
 792                                         pending_newline = true;
 793                                         unskip_newline = true;
 794                                 }
 795                         } else if (!par_lang.empty()) {
 796                                 os << from_ascii(subst(
 797                                         lang_end_command,
 798                                         "$$lang",
 799                                         par_lang));
 800                                 pending_newline = true;
 801                                 unskip_newline = true;
 802                         }
 803                 }
 804         }
 805         if (closing_rtl_ltr_environment)
 806                 os << "}";
 807
 808         if (pending_newline) {
 809                 if (unskip_newline)
 810                         // prevent unwanted whitespace
 811                         os << '%';
 812                 os << '\n';
 813         }
 814
 815         // if this is a CJK-paragraph and the next isn't, close CJK
 816         // also if the next paragraph is a multilingual environment (because of nesting)
 817         if (nextpar
 818                 && open_encoding_ == CJK
 819                 && (nextpar->getParLanguage(bparams)->encoding()->package() != Encoding::CJK
 820                    || (nextpar->layout().isEnvironment() && nextpar->isMultiLingual(bparams)))
 821                 // inbetween environments, CJK has to be closed later (nesting!)
 822                 && (!style.isEnvironment() || !nextpar->layout().isEnvironment())) {
 823                 os << "\\end{CJK}\n";
 824                 open_encoding_ = none;
 825         }
 826
 827         // If this is the last paragraph, close the CJK environment
 828         // if necessary. If it's an environment, we'll have to \end that first.
 829         if (runparams.isLastPar && !style.isEnvironment()) {
 830                 switch (open_encoding_) {
 831                         case CJK: {
 832                                 // do nothing at the end of child documents
 833                                 if (maintext && buf.masterBuffer() != &buf)
 834                                         break;
 835                                 // end of main text
 836                                 if (maintext) {
 837                                         os << "\n\\end{CJK}\n";
 838                                 // end of an inset
 839                                 } else
 840                                         os << "\\end{CJK}";
 841                                 open_encoding_ = none;
 842                                 break;
 843                         }
 844                         case inputenc: {
 845                                 os << "\\egroup";
 846                                 open_encoding_ = none;
 847                                 break;
 848                         }
 849                         case none:
 850                         default:
 851                                 // do nothing
 852                                 break;
 853                 }
 854         }
 855
 856         // If this is the last paragraph, and a local_font was set upon entering
 857         // the inset, and we're using "auto" or "default" encoding, the encoding
 858         // should be set back to that local_font's encoding.
 859         // However, do not change the encoding when a fully unicode aware backend
 860         // such as XeTeX is used.
 861         if (runparams.isLastPar && runparams_in.local_font != 0
 862             && runparams_in.encoding != runparams_in.local_font->language()->encoding()
 863             && (bparams.inputenc == "auto" || bparams.inputenc == "default")
 864             && (!runparams.isFullUnicode())) {
 865                 runparams_in.encoding = runparams_in.local_font->language()->encoding();
 866                 os << setEncoding(runparams_in.encoding->iconvName());
 867         }
 868         // Otherwise, the current encoding should be set for the next paragraph.
 869         else
 870                 runparams_in.encoding = runparams.encoding;
 871
 872
 873         // we don't need a newline for the last paragraph!!!
 874         // Note from JMarc: we will re-add a \n explicitly in
 875         // TeXEnvironment, because it is needed in this case
 876         if (nextpar) {
 877                 Layout const & next_layout = nextpar->layout();
 878                 if (style == next_layout
 879                     // no blank lines before environments!
 880                     || !next_layout.isEnvironment()
 881                     // unless there's a depth change
 882                     // FIXME What we really want to do here is put every \begin and \end
 883                     // tag on a new line (which was not the case with nested environments).
 884                     // But in the present state of play, we don't have access to the
 885                     // information whether the current TeX row is empty or not.
 886                     // For some ideas about how to fix this, see this thread:
 887                     // http://www.mail-archive.com/lyx-devel@lists.lyx.org/msg145787.html
 888                     || nextpar->params().depth() != par.params().depth()) {
 889                         os << '\n';
 890                 }
 891         }
 892
 893         LYXERR(Debug::LATEX, "TeXOnePar for paragraph " << pit << " done; ptr "
 894                 << &par << " next " << nextpar);
 895
 896         return;
 897 }
 898
 899
 900 // LaTeX all paragraphs
 901 void latexParagraphs(Buffer const & buf,
 902                      Text const & text,
 903                      otexstream & os,
 904                      OutputParams const & runparams,
 905                      string const & everypar)
 906 {
 907         BufferParams const & bparams = buf.params();
 908
 909         bool const maintext = text.isMainText();
 910         bool const is_child = buf.masterBuffer() != &buf;
 911
 912         // Open a CJK environment at the beginning of the main buffer
 913         // if the document's language is a CJK language
 914         // (but not in child documents)
 915         if (maintext && !is_child
 916             && bparams.encoding().package() == Encoding::CJK) {
 917                 os << "\\begin{CJK}{" << from_ascii(bparams.encoding().latexName())
 918                 << "}{" << from_ascii(bparams.fonts_cjk) << "}%\n";
 919                 open_encoding_ = CJK;
 920         }
 921         // if "auto begin" is switched off, explicitly switch the
 922         // language on at start
 923         string const mainlang = runparams.use_polyglossia
 924                 ? getPolyglossiaEnvName(bparams.language)
 925                 : bparams.language->babel();
 926         string const lang_begin_command = runparams.use_polyglossia ?
 927                 "\\begin{$$lang}" : lyxrc.language_command_begin;
 928
 929         if (maintext && !lyxrc.language_auto_begin &&
 930             !mainlang.empty()) {
 931                 // FIXME UNICODE
 932                 os << from_utf8(subst(lang_begin_command,
 933                                         "$$lang",
 934                                         mainlang));
 935                 if (runparams.use_polyglossia
 936                     && !bparams.language->polyglossiaOpts().empty())
 937                         os << "["
 938                             << from_ascii(bparams.language->polyglossiaOpts())
 939                             << "]";
 940                 os << '\n';
 941         }
 942
 943         ParagraphList const & paragraphs = text.paragraphs();
 944         LASSERT(runparams.par_begin <= runparams.par_end, /**/);
 945
 946         if (runparams.par_begin == runparams.par_end) {
 947                 // The full doc will be exported but it is easier to just rely on
 948                 // runparams range parameters that will be passed TeXEnvironment.
 949                 runparams.par_begin = 0;
 950                 runparams.par_end = paragraphs.size();
 951         }
 952
 953         pit_type pit = runparams.par_begin;
 954         // lastpit is for the language check after the loop.
 955         pit_type lastpit = pit;
 956         // variables used in the loop:
 957         bool was_title = false;
 958         bool already_title = false;
 959         DocumentClass const & tclass = bparams.documentClass();
 960
 961         for (; pit < runparams.par_end; ++pit) {
 962                 lastpit = pit;
 963                 ParagraphList::const_iterator par = paragraphs.constIterator(pit);
 964
 965                 // FIXME This check should not be needed. We should
 966                 // perhaps issue an error if it is.
 967                 Layout const & layout = text.inset().forcePlainLayout() ?
 968                                 tclass.plainLayout() : par->layout();
 969
 970                 if (layout.intitle) {
 971                         if (already_title) {
 972                                 LYXERR0("Error in latexParagraphs: You"
 973                                         " should not mix title layouts"
 974                                         " with normal ones.");
 975                         } else if (!was_title) {
 976                                 was_title = true;
 977                                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
 978                                         os << "\\begin{"
 979                                                         << from_ascii(tclass.titlename())
 980                                                         << "}\n";
 981                                 }
 982                         }
 983                 } else if (was_title && !already_title) {
 984                         if (tclass.titletype() == TITLE_ENVIRONMENT) {
 985                                 os << "\\end{" << from_ascii(tclass.titlename())
 986                                                 << "}\n";
 987                         }
 988                         else {
 989                                 os << "\\" << from_ascii(tclass.titlename())
 990                                                 << "\n";
 991                         }
 992                         already_title = true;
 993                         was_title = false;
 994                 }
 995
 996
 997                 if (!layout.isEnvironment() && par->params().leftIndent().zero()) {
 998                         // This is a standard top level paragraph, TeX it and continue.
 999                         TeXOnePar(buf, text, pit, os, runparams, everypar);
1000                         continue;
1001                 }
1002
1003                 TeXEnvironmentData const data =
1004                         prepareEnvironment(buf, text, par, os, runparams);
1005                 // pit can be changed in TeXEnvironment.
1006                 TeXEnvironment(buf, text, runparams, pit, os);
1007                 finishEnvironment(os, runparams, data);
1008         }
1009
1010         if (pit == runparams.par_end) {
1011                         // Make sure that the last paragraph is
1012                         // correctly terminated (because TeXOnePar does
1013                         // not add a \n in this case)
1014                         //os << '\n';
1015         }
1016
1017         // It might be that we only have a title in this document
1018         if (was_title && !already_title) {
1019                 if (tclass.titletype() == TITLE_ENVIRONMENT) {
1020                         os << "\\end{" << from_ascii(tclass.titlename())
1021                            << "}\n";
1022                 } else {
1023                         os << "\\" << from_ascii(tclass.titlename())
1024                            << "\n";
1025                 }
1026         }
1027
1028         // if "auto end" is switched off, explicitly close the language at the end
1029         // but only if the last par is in a babel language
1030         string const lang_end_command = runparams.use_polyglossia ?
1031                 "\\end{$$lang}" : lyxrc.language_command_end;
1032         if (maintext && !lyxrc.language_auto_end && !mainlang.empty() &&
1033                 paragraphs.at(lastpit).getParLanguage(bparams)->encoding()->package() != Encoding::CJK) {
1034                 os << from_utf8(subst(lang_end_command,
1035                                         "$$lang",
1036                                         mainlang))
1037                         << '\n';
1038         }
1039
1040         // If the last paragraph is an environment, we'll have to close
1041         // CJK at the very end to do proper nesting.
1042         if (maintext && !is_child && open_encoding_ == CJK) {
1043                 os << "\\end{CJK}\n";
1044                 open_encoding_ = none;
1045         }
1046
1047         // reset inherited encoding
1048         if (cjk_inherited_ > 0) {
1049                 cjk_inherited_ -= 1;
1050                 if (cjk_inherited_ == 0)
1051                         open_encoding_ = CJK;
1052         }
1053 }
1054
1055
1056 pair<bool, int> switchEncoding(odocstream & os, BufferParams const & bparams,
1057                    OutputParams const & runparams, Encoding const & newEnc,
1058                    bool force)
1059 {
1060         Encoding const & oldEnc = *runparams.encoding;
1061         bool moving_arg = runparams.moving_arg;
1062         if (!force && ((bparams.inputenc != "auto" && bparams.inputenc != "default")
1063                 || moving_arg))
1064                 return make_pair(false, 0);
1065
1066         // Do nothing if the encoding is unchanged.
1067         if (oldEnc.name() == newEnc.name())
1068                 return make_pair(false, 0);
1069
1070         // FIXME We ignore encoding switches from/to encodings that do
1071         // neither support the inputenc package nor the CJK package here.
1072         // This does of course only work in special cases (e.g. switch from
1073         // tis620-0 to latin1, but the text in latin1 contains ASCII only),
1074         // but it is the best we can do
1075         if (oldEnc.package() == Encoding::none
1076                 || newEnc.package() == Encoding::none)
1077                 return make_pair(false, 0);
1078
1079         LYXERR(Debug::LATEX, "Changing LaTeX encoding from "
1080                 << oldEnc.name() << " to " << newEnc.name());
1081         os << setEncoding(newEnc.iconvName());
1082         if (bparams.inputenc == "default")
1083                 return make_pair(true, 0);
1084
1085         docstring const inputenc_arg(from_ascii(newEnc.latexName()));
1086         switch (newEnc.package()) {
1087                 case Encoding::none:
1088                 case Encoding::japanese:
1089                         // shouldn't ever reach here, see above
1090                         return make_pair(true, 0);
1091                 case Encoding::inputenc: {
1092                         int count = inputenc_arg.length();
1093                         if (oldEnc.package() == Encoding::CJK &&
1094                             open_encoding_ == CJK) {
1095                                 os << "\\end{CJK}";
1096                                 open_encoding_ = none;
1097                                 count += 9;
1098                         }
1099                         else if (oldEnc.package() == Encoding::inputenc &&
1100                                  open_encoding_ == inputenc) {
1101                                 os << "\\egroup";
1102                                 open_encoding_ = none;
1103                                 count += 7;
1104                         }
1105                         if (runparams.local_font != 0
1106                             &&  oldEnc.package() == Encoding::CJK) {
1107                                 // within insets, \inputenc switches need
1108                                 // to be embraced within \bgroup...\egroup;
1109                                 // else CJK fails.
1110                                 os << "\\bgroup";
1111                                 count += 7;
1112                                 open_encoding_ = inputenc;
1113                         }
1114                         // with the japanese option, inputenc is omitted.
1115                         if (runparams.use_japanese)
1116                                 return make_pair(true, count);
1117                         os << "\\inputencoding{" << inputenc_arg << '}';
1118                         return make_pair(true, count + 16);
1119                 }
1120                 case Encoding::CJK: {
1121                         int count = inputenc_arg.length();
1122                         if (oldEnc.package() == Encoding::CJK &&
1123                             open_encoding_ == CJK) {
1124                                 os << "\\end{CJK}";
1125                                 count += 9;
1126                         }
1127                         if (oldEnc.package() == Encoding::inputenc &&
1128                             open_encoding_ == inputenc) {
1129                                 os << "\\egroup";
1130                                 count += 7;
1131                         }
1132                         os << "\\begin{CJK}{" << inputenc_arg << "}{"
1133                            << from_ascii(bparams.fonts_cjk) << "}";
1134                         open_encoding_ = CJK;
1135                         return make_pair(true, count + 15);
1136                 }
1137         }
1138         // Dead code to avoid a warning:
1139         return make_pair(true, 0);
1140
1141 }
1142
1143 } // namespace lyx