src/Text.cpp

   1 /**
   2  * \file src/Text.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Asger Alstrup
   7  * \author Lars Gullik Bjønnes
   8  * \author Dov Feldstern
   9  * \author Jean-Marc Lasgouttes
  10  * \author John Levon
  11  * \author André Pönitz
  12  * \author Stefan Schimanski
  13  * \author Dekel Tsur
  14  * \author Jürgen Vigna
  15  *
  16  * Full author contact details are available in file CREDITS.
  17  */
  18
  19 #include <config.h>
  20
  21 #include "Text.h"
  22
  23 #include "Author.h"
  24 #include "Buffer.h"
  25 #include "buffer_funcs.h"
  26 #include "BufferParams.h"
  27 #include "BufferView.h"
  28 #include "Changes.h"
  29 #include "CompletionList.h"
  30 #include "Cursor.h"
  31 #include "CutAndPaste.h"
  32 #include "DispatchResult.h"
  33 #include "Encoding.h"
  34 #include "ErrorList.h"
  35 #include "FuncRequest.h"
  36 #include "factory.h"
  37 #include "InsetList.h"
  38 #include "Language.h"
  39 #include "Layout.h"
  40 #include "Length.h"
  41 #include "Lexer.h"
  42 #include "lyxfind.h"
  43 #include "LyXRC.h"
  44 #include "Paragraph.h"
  45 #include "ParagraphParameters.h"
  46 #include "ParIterator.h"
  47 #include "TextClass.h"
  48 #include "TextMetrics.h"
  49 #include "VSpace.h"
  50 #include "WordLangTuple.h"
  51 #include "WordList.h"
  52
  53 #include "insets/InsetText.h"
  54 #include "insets/InsetBibitem.h"
  55 #include "insets/InsetCaption.h"
  56 #include "insets/InsetLine.h"
  57 #include "insets/InsetNewline.h"
  58 #include "insets/InsetNewpage.h"
  59 #include "insets/InsetArgument.h"
  60 #include "insets/InsetSpace.h"
  61 #include "insets/InsetSpecialChar.h"
  62 #include "insets/InsetTabular.h"
  63
  64 #include "support/debug.h"
  65 #include "support/docstream.h"
  66 #include "support/gettext.h"
  67 #include "support/lassert.h"
  68 #include "support/lstrings.h"
  69 #include "support/textutils.h"
  70
  71 #include <boost/next_prior.hpp>
  72
  73 #include <sstream>
  74
  75 using namespace std;
  76 using namespace lyx::support;
  77
  78 namespace lyx {
  79
  80 using cap::cutSelection;
  81 using cap::pasteParagraphList;
  82
  83 static bool moveItem(Paragraph & fromPar, pos_type fromPos,
  84         Paragraph & toPar, pos_type toPos, BufferParams const & params)
  85 {
  86         // Note: moveItem() does not honour change tracking!
  87         // Therefore, it should only be used for breaking and merging paragraphs
  88
  89         // We need a copy here because the character at fromPos is going to be erased.
  90         Font const tmpFont = fromPar.getFontSettings(params, fromPos);
  91         Change const tmpChange = fromPar.lookupChange(fromPos);
  92
  93         if (Inset * tmpInset = fromPar.getInset(fromPos)) {
  94                 fromPar.releaseInset(fromPos);
  95                 // The inset is not in fromPar any more.
  96                 if (!toPar.insertInset(toPos, tmpInset, tmpFont, tmpChange)) {
  97                         delete tmpInset;
  98                         return false;
  99                 }
 100                 return true;
 101         }
 102
 103         char_type const tmpChar = fromPar.getChar(fromPos);
 104         fromPar.eraseChar(fromPos, false);
 105         toPar.insertChar(toPos, tmpChar, tmpFont, tmpChange);
 106         return true;
 107 }
 108
 109
 110 void breakParagraphConservative(BufferParams const & bparams,
 111         ParagraphList & pars, pit_type par_offset, pos_type pos)
 112 {
 113         // create a new paragraph
 114         Paragraph & tmp = *pars.insert(boost::next(pars.begin(), par_offset + 1),
 115                                        Paragraph());
 116         Paragraph & par = pars[par_offset];
 117
 118         tmp.setInsetOwner(&par.inInset());
 119         tmp.makeSameLayout(par);
 120
 121         LASSERT(pos <= par.size(), /**/);
 122
 123         if (pos < par.size()) {
 124                 // move everything behind the break position to the new paragraph
 125                 pos_type pos_end = par.size() - 1;
 126
 127                 for (pos_type i = pos, j = 0; i <= pos_end; ++i) {
 128                         if (moveItem(par, pos, tmp, j, bparams)) {
 129                                 ++j;
 130                         }
 131                 }
 132                 // Move over the end-of-par change information
 133                 tmp.setChange(tmp.size(), par.lookupChange(par.size()));
 134                 par.setChange(par.size(), Change(bparams.trackChanges ?
 135                                            Change::INSERTED : Change::UNCHANGED));
 136         }
 137 }
 138
 139
 140 void mergeParagraph(BufferParams const & bparams,
 141         ParagraphList & pars, pit_type par_offset)
 142 {
 143         Paragraph & next = pars[par_offset + 1];
 144         Paragraph & par = pars[par_offset];
 145
 146         pos_type pos_end = next.size() - 1;
 147         pos_type pos_insert = par.size();
 148
 149         // the imaginary end-of-paragraph character (at par.size()) has to be
 150         // marked as unmodified. Otherwise, its change is adopted by the first
 151         // character of the next paragraph.
 152         if (par.isChanged(par.size())) {
 153                 LYXERR(Debug::CHANGES,
 154                    "merging par with inserted/deleted end-of-par character");
 155                 par.setChange(par.size(), Change(Change::UNCHANGED));
 156         }
 157
 158         Change change = next.lookupChange(next.size());
 159
 160         // move the content of the second paragraph to the end of the first one
 161         for (pos_type i = 0, j = pos_insert; i <= pos_end; ++i) {
 162                 if (moveItem(next, 0, par, j, bparams)) {
 163                         ++j;
 164                 }
 165         }
 166
 167         // move the change of the end-of-paragraph character
 168         par.setChange(par.size(), change);
 169
 170         pars.erase(boost::next(pars.begin(), par_offset + 1));
 171 }
 172
 173
 174 Text::Text(InsetText * owner, bool use_default_layout)
 175         : owner_(owner), autoBreakRows_(false), undo_counter_(0)
 176 {
 177         pars_.push_back(Paragraph());
 178         Paragraph & par = pars_.back();
 179         par.setInsetOwner(owner);
 180         DocumentClass const & dc = owner->buffer().params().documentClass();
 181         if (use_default_layout)
 182                 par.setDefaultLayout(dc);
 183         else
 184                 par.setPlainLayout(dc);
 185 }
 186
 187
 188 Text::Text(InsetText * owner, Text const & text)
 189         : owner_(owner), autoBreakRows_(text.autoBreakRows_), undo_counter_(0)
 190 {
 191         pars_ = text.pars_;
 192         ParagraphList::iterator const end = pars_.end();
 193         ParagraphList::iterator it = pars_.begin();
 194         for (; it != end; ++it)
 195                 it->setInsetOwner(owner);
 196 }
 197
 198
 199 pit_type Text::depthHook(pit_type pit, depth_type depth) const
 200 {
 201         pit_type newpit = pit;
 202
 203         if (newpit != 0)
 204                 --newpit;
 205
 206         while (newpit != 0 && pars_[newpit].getDepth() > depth)
 207                 --newpit;
 208
 209         if (pars_[newpit].getDepth() > depth)
 210                 return pit;
 211
 212         return newpit;
 213 }
 214
 215
 216 pit_type Text::outerHook(pit_type par_offset) const
 217 {
 218         Paragraph const & par = pars_[par_offset];
 219
 220         if (par.getDepth() == 0)
 221                 return pars_.size();
 222         return depthHook(par_offset, depth_type(par.getDepth() - 1));
 223 }
 224
 225
 226 bool Text::isFirstInSequence(pit_type par_offset) const
 227 {
 228         Paragraph const & par = pars_[par_offset];
 229
 230         pit_type dhook_offset = depthHook(par_offset, par.getDepth());
 231
 232         if (dhook_offset == par_offset)
 233                 return true;
 234
 235         Paragraph const & dhook = pars_[dhook_offset];
 236
 237         return dhook.layout() != par.layout()
 238                 || dhook.getDepth() != par.getDepth();
 239 }
 240
 241
 242 Font const Text::outerFont(pit_type par_offset) const
 243 {
 244         depth_type par_depth = pars_[par_offset].getDepth();
 245         FontInfo tmpfont = inherit_font;
 246
 247         // Resolve against environment font information
 248         while (par_offset != pit_type(pars_.size())
 249                && par_depth
 250                && !tmpfont.resolved()) {
 251                 par_offset = outerHook(par_offset);
 252                 if (par_offset != pit_type(pars_.size())) {
 253                         tmpfont.realize(pars_[par_offset].layout().font);
 254                         par_depth = pars_[par_offset].getDepth();
 255                 }
 256         }
 257
 258         return Font(tmpfont);
 259 }
 260
 261
 262 static void acceptOrRejectChanges(ParagraphList & pars,
 263         BufferParams const & bparams, Text::ChangeOp op)
 264 {
 265         pit_type pars_size = static_cast<pit_type>(pars.size());
 266
 267         // first, accept or reject changes within each individual
 268         // paragraph (do not consider end-of-par)
 269         for (pit_type pit = 0; pit < pars_size; ++pit) {
 270                 // prevent assertion failure
 271                 if (!pars[pit].empty()) {
 272                         if (op == Text::ACCEPT)
 273                                 pars[pit].acceptChanges(0, pars[pit].size());
 274                         else
 275                                 pars[pit].rejectChanges(0, pars[pit].size());
 276                 }
 277         }
 278
 279         // next, accept or reject imaginary end-of-par characters
 280         for (pit_type pit = 0; pit < pars_size; ++pit) {
 281                 pos_type pos = pars[pit].size();
 282                 if (pars[pit].isChanged(pos)) {
 283                         // keep the end-of-par char if it is inserted and accepted
 284                         // or when it is deleted and rejected.
 285                         if (pars[pit].isInserted(pos) == (op == Text::ACCEPT)) {
 286                                 pars[pit].setChange(pos, Change(Change::UNCHANGED));
 287                         } else {
 288                                 if (pit == pars_size - 1) {
 289                                         // we cannot remove a par break at the end of the last
 290                                         // paragraph; instead, we mark it unchanged
 291                                         pars[pit].setChange(pos, Change(Change::UNCHANGED));
 292                                 } else {
 293                                         mergeParagraph(bparams, pars, pit);
 294                                         --pit;
 295                                         --pars_size;
 296                                 }
 297                         }
 298                 }
 299         }
 300 }
 301
 302
 303 void acceptChanges(ParagraphList & pars, BufferParams const & bparams)
 304 {
 305         acceptOrRejectChanges(pars, bparams, Text::ACCEPT);
 306 }
 307
 308
 309 void rejectChanges(ParagraphList & pars, BufferParams const & bparams)
 310 {
 311         acceptOrRejectChanges(pars, bparams, Text::REJECT);
 312 }
 313
 314
 315 InsetText const & Text::inset() const
 316 {
 317         return *owner_;
 318 }
 319
 320
 321 void Text::readParToken(Paragraph & par, Lexer & lex,
 322         string const & token, Font & font, Change & change, ErrorList & errorList)
 323 {
 324         Buffer * buf = const_cast<Buffer *>(&owner_->buffer());
 325         BufferParams const & bp = buf->params();
 326
 327         if (token[0] != '\\') {
 328                 docstring dstr = lex.getDocString();
 329                 par.appendString(dstr, font, change);
 330
 331         } else if (token == "\\begin_layout") {
 332                 lex.eatLine();
 333                 docstring layoutname = lex.getDocString();
 334
 335                 font = Font(inherit_font, bp.language);
 336                 change = Change(Change::UNCHANGED);
 337
 338                 DocumentClass const & tclass = bp.documentClass();
 339
 340                 if (layoutname.empty())
 341                         layoutname = tclass.defaultLayoutName();
 342
 343                 if (owner_->forcePlainLayout()) {
 344                         // in this case only the empty layout is allowed
 345                         layoutname = tclass.plainLayoutName();
 346                 } else if (par.usePlainLayout()) {
 347                         // in this case, default layout maps to empty layout
 348                         if (layoutname == tclass.defaultLayoutName())
 349                                 layoutname = tclass.plainLayoutName();
 350                 } else {
 351                         // otherwise, the empty layout maps to the default
 352                         if (layoutname == tclass.plainLayoutName())
 353                                 layoutname = tclass.defaultLayoutName();
 354                 }
 355
 356                 // When we apply an unknown layout to a document, we add this layout to the textclass
 357                 // of this document. For example, when you apply class article to a beamer document,
 358                 // all unknown layouts such as frame will be added to document class article so that
 359                 // these layouts can keep their original names.
 360                 tclass.addLayoutIfNeeded(layoutname);
 361
 362                 par.setLayout(bp.documentClass()[layoutname]);
 363
 364                 // Test whether the layout is obsolete.
 365                 Layout const & layout = par.layout();
 366                 if (!layout.obsoleted_by().empty())
 367                         par.setLayout(bp.documentClass()[layout.obsoleted_by()]);
 368
 369                 par.params().read(lex);
 370
 371         } else if (token == "\\end_layout") {
 372                 LYXERR0("Solitary \\end_layout in line " << lex.lineNumber() << "\n"
 373                        << "Missing \\begin_layout ?");
 374         } else if (token == "\\end_inset") {
 375                 LYXERR0("Solitary \\end_inset in line " << lex.lineNumber() << "\n"
 376                        << "Missing \\begin_inset ?");
 377         } else if (token == "\\begin_inset") {
 378                 Inset * inset = readInset(lex, buf);
 379                 if (inset)
 380                         par.insertInset(par.size(), inset, font, change);
 381                 else {
 382                         lex.eatLine();
 383                         docstring line = lex.getDocString();
 384                         errorList.push_back(ErrorItem(_("Unknown Inset"), line,
 385                                             par.id(), 0, par.size()));
 386                 }
 387         } else if (token == "\\family") {
 388                 lex.next();
 389                 setLyXFamily(lex.getString(), font.fontInfo());
 390         } else if (token == "\\series") {
 391                 lex.next();
 392                 setLyXSeries(lex.getString(), font.fontInfo());
 393         } else if (token == "\\shape") {
 394                 lex.next();
 395                 setLyXShape(lex.getString(), font.fontInfo());
 396         } else if (token == "\\size") {
 397                 lex.next();
 398                 setLyXSize(lex.getString(), font.fontInfo());
 399         } else if (token == "\\lang") {
 400                 lex.next();
 401                 string const tok = lex.getString();
 402                 Language const * lang = languages.getLanguage(tok);
 403                 if (lang) {
 404                         font.setLanguage(lang);
 405                 } else {
 406                         font.setLanguage(bp.language);
 407                         lex.printError("Unknown language `$$Token'");
 408                 }
 409         } else if (token == "\\numeric") {
 410                 lex.next();
 411                 font.fontInfo().setNumber(setLyXMisc(lex.getString()));
 412         } else if (token == "\\emph") {
 413                 lex.next();
 414                 font.fontInfo().setEmph(setLyXMisc(lex.getString()));
 415         } else if (token == "\\bar") {
 416                 lex.next();
 417                 string const tok = lex.getString();
 418
 419                 if (tok == "under")
 420                         font.fontInfo().setUnderbar(FONT_ON);
 421                 else if (tok == "no")
 422                         font.fontInfo().setUnderbar(FONT_OFF);
 423                 else if (tok == "default")
 424                         font.fontInfo().setUnderbar(FONT_INHERIT);
 425                 else
 426                         lex.printError("Unknown bar font flag "
 427                                        "`$$Token'");
 428         } else if (token == "\\strikeout") {
 429                 lex.next();
 430                 font.fontInfo().setStrikeout(setLyXMisc(lex.getString()));
 431         } else if (token == "\\uuline") {
 432                 lex.next();
 433                 font.fontInfo().setUuline(setLyXMisc(lex.getString()));
 434         } else if (token == "\\uwave") {
 435                 lex.next();
 436                 font.fontInfo().setUwave(setLyXMisc(lex.getString()));
 437         } else if (token == "\\noun") {
 438                 lex.next();
 439                 font.fontInfo().setNoun(setLyXMisc(lex.getString()));
 440         } else if (token == "\\color") {
 441                 lex.next();
 442                 setLyXColor(lex.getString(), font.fontInfo());
 443         } else if (token == "\\SpecialChar") {
 444                 auto_ptr<Inset> inset;
 445                 inset.reset(new InsetSpecialChar);
 446                 inset->read(lex);
 447                 inset->setBuffer(*buf);
 448                 par.insertInset(par.size(), inset.release(), font, change);
 449         } else if (token == "\\backslash") {
 450                 par.appendChar('\\', font, change);
 451         } else if (token == "\\LyXTable") {
 452                 auto_ptr<Inset> inset(new InsetTabular(buf));
 453                 inset->read(lex);
 454                 par.insertInset(par.size(), inset.release(), font, change);
 455         } else if (token == "\\lyxline") {
 456                 auto_ptr<Inset> inset;
 457                 inset.reset(new InsetLine);
 458                 inset->setBuffer(*buf);
 459                 par.insertInset(par.size(), inset.release(), font, change);
 460         } else if (token == "\\change_unchanged") {
 461                 change = Change(Change::UNCHANGED);
 462         } else if (token == "\\change_inserted" || token == "\\change_deleted") {
 463                 lex.eatLine();
 464                 istringstream is(lex.getString());
 465                 unsigned int aid;
 466                 time_t ct;
 467                 is >> aid >> ct;
 468                 map<unsigned int, int> const & am = bp.author_map;
 469                 if (am.find(aid) == am.end()) {
 470                         errorList.push_back(ErrorItem(_("Change tracking error"),
 471                                             bformat(_("Unknown author index for change: %1$d\n"), aid),
 472                                             par.id(), 0, par.size()));
 473                         change = Change(Change::UNCHANGED);
 474                 } else {
 475                         if (token == "\\change_inserted")
 476                                 change = Change(Change::INSERTED, am.find(aid)->second, ct);
 477                         else
 478                                 change = Change(Change::DELETED, am.find(aid)->second, ct);
 479                 }
 480         } else {
 481                 lex.eatLine();
 482                 errorList.push_back(ErrorItem(_("Unknown token"),
 483                         bformat(_("Unknown token: %1$s %2$s\n"), from_utf8(token),
 484                         lex.getDocString()),
 485                         par.id(), 0, par.size()));
 486         }
 487 }
 488
 489
 490 void Text::readParagraph(Paragraph & par, Lexer & lex,
 491         ErrorList & errorList)
 492 {
 493         lex.nextToken();
 494         string token = lex.getString();
 495         Font font;
 496         Change change(Change::UNCHANGED);
 497
 498         while (lex.isOK()) {
 499                 readParToken(par, lex, token, font, change, errorList);
 500
 501                 lex.nextToken();
 502                 token = lex.getString();
 503
 504                 if (token.empty())
 505                         continue;
 506
 507                 if (token == "\\end_layout") {
 508                         //Ok, paragraph finished
 509                         break;
 510                 }
 511
 512                 LYXERR(Debug::PARSER, "Handling paragraph token: `" << token << '\'');
 513                 if (token == "\\begin_layout" || token == "\\end_document"
 514                     || token == "\\end_inset" || token == "\\begin_deeper"
 515                     || token == "\\end_deeper") {
 516                         lex.pushToken(token);
 517                         lyxerr << "Paragraph ended in line "
 518                                << lex.lineNumber() << "\n"
 519                                << "Missing \\end_layout.\n";
 520                         break;
 521                 }
 522         }
 523         // Final change goes to paragraph break:
 524         par.setChange(par.size(), change);
 525
 526         // Initialize begin_of_body_ on load; redoParagraph maintains
 527         par.setBeginOfBody();
 528 }
 529
 530
 531 class TextCompletionList : public CompletionList
 532 {
 533 public:
 534         ///
 535         TextCompletionList(Cursor const & cur, WordList const * list)
 536                 : buffer_(cur.buffer()), pos_(0), list_(list)
 537         {}
 538         ///
 539         virtual ~TextCompletionList() {}
 540
 541         ///
 542         virtual bool sorted() const { return true; }
 543         ///
 544         virtual size_t size() const
 545         {
 546                 return list_->size();
 547         }
 548         ///
 549         virtual docstring const & data(size_t idx) const
 550         {
 551                 return list_->word(idx);
 552         }
 553
 554 private:
 555         ///
 556         Buffer const * buffer_;
 557         ///
 558         size_t pos_;
 559         ///
 560         WordList const * list_;
 561 };
 562
 563
 564 bool Text::empty() const
 565 {
 566         return pars_.empty() || (pars_.size() == 1 && pars_[0].empty()
 567                 // FIXME: Should we consider the labeled type as empty too?
 568                 && pars_[0].layout().labeltype == LABEL_NO_LABEL);
 569 }
 570
 571
 572 double Text::spacing(Paragraph const & par) const
 573 {
 574         if (par.params().spacing().isDefault())
 575                 return owner_->buffer().params().spacing().getValue();
 576         return par.params().spacing().getValue();
 577 }
 578
 579
 580 /**
 581  * This breaks a paragraph at the specified position.
 582  * The new paragraph will:
 583  * - Decrease depth by one (or change layout to default layout) when
 584  *    keep_layout == false
 585  * - keep current depth and layout when keep_layout == true
 586  */
 587 static void breakParagraph(Text & text, pit_type par_offset, pos_type pos,
 588                     bool keep_layout)
 589 {
 590         BufferParams const & bparams = text.inset().buffer().params();
 591         ParagraphList & pars = text.paragraphs();
 592         // create a new paragraph, and insert into the list
 593         ParagraphList::iterator tmp =
 594                 pars.insert(boost::next(pars.begin(), par_offset + 1),
 595                             Paragraph());
 596
 597         Paragraph & par = pars[par_offset];
 598
 599         // remember to set the inset_owner
 600         tmp->setInsetOwner(&par.inInset());
 601         // without doing that we get a crash when typing <Return> at the
 602         // end of a paragraph
 603         tmp->setPlainOrDefaultLayout(bparams.documentClass());
 604
 605         // layout stays the same with latex-environments
 606         if (keep_layout) {
 607                 tmp->setLayout(par.layout());
 608                 tmp->setLabelWidthString(par.params().labelWidthString());
 609                 tmp->params().depth(par.params().depth());
 610         } else if (par.params().depth() > 0) {
 611                 Paragraph const & hook = pars[text.outerHook(par_offset)];
 612                 tmp->setLayout(hook.layout());
 613                 // not sure the line below is useful
 614                 tmp->setLabelWidthString(par.params().labelWidthString());
 615                 tmp->params().depth(hook.params().depth());
 616         }
 617
 618         bool const isempty = (par.allowEmpty() && par.empty());
 619
 620         if (!isempty && (par.size() > pos || par.empty())) {
 621                 tmp->setLayout(par.layout());
 622                 tmp->params().align(par.params().align());
 623                 tmp->setLabelWidthString(par.params().labelWidthString());
 624
 625                 tmp->params().depth(par.params().depth());
 626                 tmp->params().noindent(par.params().noindent());
 627
 628                 // move everything behind the break position
 629                 // to the new paragraph
 630
 631                 /* Note: if !keepempty, empty() == true, then we reach
 632                  * here with size() == 0. So pos_end becomes - 1. This
 633                  * doesn't cause problems because both loops below
 634                  * enforce pos <= pos_end and 0 <= pos
 635                  */
 636                 pos_type pos_end = par.size() - 1;
 637
 638                 for (pos_type i = pos, j = 0; i <= pos_end; ++i) {
 639                         if (moveItem(par, pos, *tmp, j, bparams)) {
 640                                 ++j;
 641                         }
 642                 }
 643         }
 644
 645         // Move over the end-of-par change information
 646         tmp->setChange(tmp->size(), par.lookupChange(par.size()));
 647         par.setChange(par.size(), Change(bparams.trackChanges ?
 648                                            Change::INSERTED : Change::UNCHANGED));
 649
 650         if (pos) {
 651                 // Make sure that we keep the language when
 652                 // breaking paragraph.
 653                 if (tmp->empty()) {
 654                         Font changed = tmp->getFirstFontSettings(bparams);
 655                         Font const & old = par.getFontSettings(bparams, par.size());
 656                         changed.setLanguage(old.language());
 657                         tmp->setFont(0, changed);
 658                 }
 659
 660                 return;
 661         }
 662
 663         if (!isempty) {
 664                 bool const soa = par.params().startOfAppendix();
 665                 par.params().clear();
 666                 // do not lose start of appendix marker (bug 4212)
 667                 par.params().startOfAppendix(soa);
 668                 par.setPlainOrDefaultLayout(bparams.documentClass());
 669         }
 670
 671         // layout stays the same with latex-environments
 672         if (keep_layout) {
 673                 par.setLayout(tmp->layout());
 674                 par.setLabelWidthString(tmp->params().labelWidthString());
 675                 par.params().depth(tmp->params().depth());
 676         }
 677 }
 678
 679
 680 void Text::breakParagraph(Cursor & cur, bool inverse_logic)
 681 {
 682         LASSERT(this == cur.text(), /**/);
 683
 684         Paragraph & cpar = cur.paragraph();
 685         pit_type cpit = cur.pit();
 686
 687         DocumentClass const & tclass = cur.buffer()->params().documentClass();
 688         Layout const & layout = cpar.layout();
 689
 690         if (cur.lastpos() == 0 && !cpar.allowEmpty()) {
 691                 if (changeDepthAllowed(cur, DEC_DEPTH))
 692                         changeDepth(cur, DEC_DEPTH);
 693                 else
 694                         setLayout(cur, tclass.defaultLayoutName());
 695                 return;
 696         }
 697
 698         // a layout change may affect also the following paragraph
 699         recUndo(cur, cur.pit(), undoSpan(cur.pit()) - 1);
 700
 701         // Always break behind a space
 702         // It is better to erase the space (Dekel)
 703         if (cur.pos() != cur.lastpos() && cpar.isLineSeparator(cur.pos()))
 704                 cpar.eraseChar(cur.pos(), cur.buffer()->params().trackChanges);
 705
 706         // What should the layout for the new paragraph be?
 707         bool keep_layout = inverse_logic ?
 708                 !layout.isEnvironment()
 709                 : layout.isEnvironment();
 710
 711         // We need to remember this before we break the paragraph, because
 712         // that invalidates the layout variable
 713         bool sensitive = layout.labeltype == LABEL_SENSITIVE;
 714
 715         // we need to set this before we insert the paragraph.
 716         bool const isempty = cpar.allowEmpty() && cpar.empty();
 717
 718         lyx::breakParagraph(*this, cpit, cur.pos(), keep_layout);
 719
 720         // After this, neither paragraph contains any rows!
 721
 722         cpit = cur.pit();
 723         pit_type next_par = cpit + 1;
 724
 725         // well this is the caption hack since one caption is really enough
 726         if (sensitive) {
 727                 if (cur.pos() == 0)
 728                         // set to standard-layout
 729                 //FIXME Check if this should be plainLayout() in some cases
 730                         pars_[cpit].applyLayout(tclass.defaultLayout());
 731                 else
 732                         // set to standard-layout
 733                         //FIXME Check if this should be plainLayout() in some cases
 734                         pars_[next_par].applyLayout(tclass.defaultLayout());
 735         }
 736
 737         while (!pars_[next_par].empty() && pars_[next_par].isNewline(0)) {
 738                 if (!pars_[next_par].eraseChar(0, cur.buffer()->params().trackChanges))
 739                         break; // the character couldn't be deleted physically due to change tracking
 740         }
 741
 742         // A singlePar update is not enough in this case.
 743         cur.screenUpdateFlags(Update::Force);
 744         cur.forceBufferUpdate();
 745
 746         // This check is necessary. Otherwise the new empty paragraph will
 747         // be deleted automatically. And it is more friendly for the user!
 748         if (cur.pos() != 0 || isempty)
 749                 setCursor(cur, cur.pit() + 1, 0);
 750         else
 751                 setCursor(cur, cur.pit(), 0);
 752 }
 753
 754
 755 // needed to insert the selection
 756 void Text::insertStringAsLines(DocIterator const & dit, docstring const & str,
 757                 Font const & font)
 758 {
 759         BufferParams const & bparams = owner_->buffer().params();
 760         pit_type pit = dit.pit();
 761         pos_type pos = dit.pos();
 762
 763         // insert the string, don't insert doublespace
 764         bool space_inserted = true;
 765         for (docstring::const_iterator cit = str.begin();
 766             cit != str.end(); ++cit) {
 767                 Paragraph & par = pars_[pit];
 768                 if (*cit == '\n') {
 769                         if (autoBreakRows_ && (!par.empty() || par.allowEmpty())) {
 770                                 lyx::breakParagraph(*this, pit, pos,
 771                                         par.layout().isEnvironment());
 772                                 ++pit;
 773                                 pos = 0;
 774                                 space_inserted = true;
 775                         } else {
 776                                 continue;
 777                         }
 778                         // do not insert consecutive spaces if !free_spacing
 779                 } else if ((*cit == ' ' || *cit == '\t') &&
 780                            space_inserted && !par.isFreeSpacing()) {
 781                         continue;
 782                 } else if (*cit == '\t') {
 783                         if (!par.isFreeSpacing()) {
 784                                 // tabs are like spaces here
 785                                 par.insertChar(pos, ' ', font, bparams.trackChanges);
 786                                 ++pos;
 787                                 space_inserted = true;
 788                         } else {
 789                                 par.insertChar(pos, *cit, font, bparams.trackChanges);
 790                                 ++pos;
 791                                 space_inserted = true;
 792                         }
 793                 } else if (!isPrintable(*cit)) {
 794                         // Ignore unprintables
 795                         continue;
 796                 } else {
 797                         // just insert the character
 798                         par.insertChar(pos, *cit, font, bparams.trackChanges);
 799                         ++pos;
 800                         space_inserted = (*cit == ' ');
 801                 }
 802         }
 803 }
 804
 805
 806 // turn double CR to single CR, others are converted into one
 807 // blank. Then insertStringAsLines is called
 808 void Text::insertStringAsParagraphs(DocIterator const & dit, docstring const & str,
 809                 Font const & font)
 810 {
 811         docstring linestr = str;
 812         bool newline_inserted = false;
 813
 814         for (string::size_type i = 0, siz = linestr.size(); i < siz; ++i) {
 815                 if (linestr[i] == '\n') {
 816                         if (newline_inserted) {
 817                                 // we know that \r will be ignored by
 818                                 // insertStringAsLines. Of course, it is a dirty
 819                                 // trick, but it works...
 820                                 linestr[i - 1] = '\r';
 821                                 linestr[i] = '\n';
 822                         } else {
 823                                 linestr[i] = ' ';
 824                                 newline_inserted = true;
 825                         }
 826                 } else if (isPrintable(linestr[i])) {
 827                         newline_inserted = false;
 828                 }
 829         }
 830         insertStringAsLines(dit, linestr, font);
 831 }
 832
 833
 834 // insert a character, moves all the following breaks in the
 835 // same Paragraph one to the right and make a rebreak
 836 void Text::insertChar(Cursor & cur, char_type c)
 837 {
 838         LASSERT(this == cur.text(), /**/);
 839
 840         cur.recordUndo(INSERT_UNDO);
 841
 842         TextMetrics const & tm = cur.bv().textMetrics(this);
 843         Buffer const & buffer = *cur.buffer();
 844         Paragraph & par = cur.paragraph();
 845         // try to remove this
 846         pit_type const pit = cur.pit();
 847
 848         bool const freeSpacing = par.layout().free_spacing ||
 849                 par.isFreeSpacing();
 850
 851         if (lyxrc.auto_number) {
 852                 static docstring const number_operators = from_ascii("+-/*");
 853                 static docstring const number_unary_operators = from_ascii("+-");
 854                 static docstring const number_seperators = from_ascii(".,:");
 855
 856                 if (cur.current_font.fontInfo().number() == FONT_ON) {
 857                         if (!isDigit(c) && !contains(number_operators, c) &&
 858                             !(contains(number_seperators, c) &&
 859                               cur.pos() != 0 &&
 860                               cur.pos() != cur.lastpos() &&
 861                               tm.displayFont(pit, cur.pos()).fontInfo().number() == FONT_ON &&
 862                               tm.displayFont(pit, cur.pos() - 1).fontInfo().number() == FONT_ON)
 863                            )
 864                                 number(cur); // Set current_font.number to OFF
 865                 } else if (isDigit(c) &&
 866                            cur.real_current_font.isVisibleRightToLeft()) {
 867                         number(cur); // Set current_font.number to ON
 868
 869                         if (cur.pos() != 0) {
 870                                 char_type const c = par.getChar(cur.pos() - 1);
 871                                 if (contains(number_unary_operators, c) &&
 872                                     (cur.pos() == 1
 873                                      || par.isSeparator(cur.pos() - 2)
 874                                      || par.isNewline(cur.pos() - 2))
 875                                   ) {
 876                                         setCharFont(pit, cur.pos() - 1, cur.current_font,
 877                                                 tm.font_);
 878                                 } else if (contains(number_seperators, c)
 879                                      && cur.pos() >= 2
 880                                      && tm.displayFont(pit, cur.pos() - 2).fontInfo().number() == FONT_ON) {
 881                                         setCharFont(pit, cur.pos() - 1, cur.current_font,
 882                                                 tm.font_);
 883                                 }
 884                         }
 885                 }
 886         }
 887
 888         // In Bidi text, we want spaces to be treated in a special way: spaces
 889         // which are between words in different languages should get the
 890         // paragraph's language; otherwise, spaces should keep the language
 891         // they were originally typed in. This is only in effect while typing;
 892         // after the text is already typed in, the user can always go back and
 893         // explicitly set the language of a space as desired. But 99.9% of the
 894         // time, what we're doing here is what the user actually meant.
 895         //
 896         // The following cases are the ones in which the language of the space
 897         // should be changed to match that of the containing paragraph. In the
 898         // depictions, lowercase is LTR, uppercase is RTL, underscore (_)
 899         // represents a space, pipe (|) represents the cursor position (so the
 900         // character before it is the one just typed in). The different cases
 901         // are depicted logically (not visually), from left to right:
 902         //
 903         // 1. A_a|
 904         // 2. a_A|
 905         //
 906         // Theoretically, there are other situations that we should, perhaps, deal
 907         // with (e.g.: a|_A, A|_a). In practice, though, there really isn't any
 908         // point (to understand why, just try to create this situation...).
 909
 910         if ((cur.pos() >= 2) && (par.isLineSeparator(cur.pos() - 1))) {
 911                 // get font in front and behind the space in question. But do NOT
 912                 // use getFont(cur.pos()) because the character c is not inserted yet
 913                 Font const pre_space_font  = tm.displayFont(cur.pit(), cur.pos() - 2);
 914                 Font const & post_space_font = cur.real_current_font;
 915                 bool pre_space_rtl  = pre_space_font.isVisibleRightToLeft();
 916                 bool post_space_rtl = post_space_font.isVisibleRightToLeft();
 917
 918                 if (pre_space_rtl != post_space_rtl) {
 919                         // Set the space's language to match the language of the
 920                         // adjacent character whose direction is the paragraph's
 921                         // direction; don't touch other properties of the font
 922                         Language const * lang =
 923                                 (pre_space_rtl == par.isRTL(buffer.params())) ?
 924                                 pre_space_font.language() : post_space_font.language();
 925
 926                         Font space_font = tm.displayFont(cur.pit(), cur.pos() - 1);
 927                         space_font.setLanguage(lang);
 928                         par.setFont(cur.pos() - 1, space_font);
 929                 }
 930         }
 931
 932         // Next check, if there will be two blanks together or a blank at
 933         // the beginning of a paragraph.
 934         // I decided to handle blanks like normal characters, the main
 935         // difference are the special checks when calculating the row.fill
 936         // (blank does not count at the end of a row) and the check here
 937
 938         // When the free-spacing option is set for the current layout,
 939         // disable the double-space checking
 940         if (!freeSpacing && isLineSeparatorChar(c)) {
 941                 if (cur.pos() == 0) {
 942                         static bool sent_space_message = false;
 943                         if (!sent_space_message) {
 944                                 cur.message(_("You cannot insert a space at the "
 945                                                            "beginning of a paragraph. Please read the Tutorial."));
 946                                 sent_space_message = true;
 947                         }
 948                         return;
 949                 }
 950                 LASSERT(cur.pos() > 0, /**/);
 951                 if ((par.isLineSeparator(cur.pos() - 1) || par.isNewline(cur.pos() - 1))
 952                     && !par.isDeleted(cur.pos() - 1)) {
 953                         static bool sent_space_message = false;
 954                         if (!sent_space_message) {
 955                                 cur.message(_("You cannot type two spaces this way. "
 956                                                            "Please read the Tutorial."));
 957                                 sent_space_message = true;
 958                         }
 959                         return;
 960                 }
 961         }
 962
 963         par.insertChar(cur.pos(), c, cur.current_font,
 964                 cur.buffer()->params().trackChanges);
 965         cur.checkBufferStructure();
 966
 967 //              cur.screenUpdateFlags(Update::Force);
 968         bool boundary = cur.boundary()
 969                 || tm.isRTLBoundary(cur.pit(), cur.pos() + 1);
 970         setCursor(cur, cur.pit(), cur.pos() + 1, false, boundary);
 971         charInserted(cur);
 972 }
 973
 974
 975 void Text::charInserted(Cursor & cur)
 976 {
 977         Paragraph & par = cur.paragraph();
 978
 979         // Here we call finishUndo for every 20 characters inserted.
 980         // This is from my experience how emacs does it. (Lgb)
 981         if (undo_counter_ < 20) {
 982                 ++undo_counter_;
 983         } else {
 984                 cur.finishUndo();
 985                 undo_counter_ = 0;
 986         }
 987
 988         // register word if a non-letter was entered
 989         if (cur.pos() > 1
 990             && !par.isWordSeparator(cur.pos() - 2)
 991             && par.isWordSeparator(cur.pos() - 1)) {
 992                 // get the word in front of cursor
 993                 LASSERT(this == cur.text(), /**/);
 994                 cur.paragraph().updateWords();
 995         }
 996 }
 997
 998
 999 // the cursor set functions have a special mechanism. When they
1000 // realize, that you left an empty paragraph, they will delete it.
1001
1002 bool Text::cursorForwardOneWord(Cursor & cur)
1003 {
1004         LASSERT(this == cur.text(), /**/);
1005
1006         pos_type const lastpos = cur.lastpos();
1007         pit_type pit = cur.pit();
1008         pos_type pos = cur.pos();
1009         Paragraph const & par = cur.paragraph();
1010
1011         // Paragraph boundary is a word boundary
1012         if (pos == lastpos) {
1013                 if (pit != cur.lastpit())
1014                         return setCursor(cur, pit + 1, 0);
1015                 else
1016                         return false;
1017         }
1018
1019         if (lyxrc.mac_like_word_movement) {
1020                 // Skip through trailing punctuation and spaces.
1021                 while (pos != lastpos && (par.isChar(pos) || par.isSpace(pos)))
1022                         ++pos;
1023
1024                 // Skip over either a non-char inset or a full word
1025                 if (pos != lastpos && par.isWordSeparator(pos))
1026                         ++pos;
1027                 else while (pos != lastpos && !par.isWordSeparator(pos))
1028                              ++pos;
1029         } else {
1030                 LASSERT(pos < lastpos, /**/); // see above
1031                 if (!par.isWordSeparator(pos))
1032                         while (pos != lastpos && !par.isWordSeparator(pos))
1033                                 ++pos;
1034                 else if (par.isChar(pos))
1035                         while (pos != lastpos && par.isChar(pos))
1036                                 ++pos;
1037                 else if (!par.isSpace(pos)) // non-char inset
1038                         ++pos;
1039
1040                 // Skip over white space
1041                 while (pos != lastpos && par.isSpace(pos))
1042                              ++pos;
1043         }
1044
1045         return setCursor(cur, pit, pos);
1046 }
1047
1048
1049 bool Text::cursorBackwardOneWord(Cursor & cur)
1050 {
1051         LASSERT(this == cur.text(), /**/);
1052
1053         pit_type pit = cur.pit();
1054         pos_type pos = cur.pos();
1055         Paragraph & par = cur.paragraph();
1056
1057         // Paragraph boundary is a word boundary
1058         if (pos == 0 && pit != 0)
1059                 return setCursor(cur, pit - 1, getPar(pit - 1).size());
1060
1061         if (lyxrc.mac_like_word_movement) {
1062                 // Skip through punctuation and spaces.
1063                 while (pos != 0 && (par.isChar(pos - 1) || par.isSpace(pos - 1)))
1064                         --pos;
1065
1066                 // Skip over either a non-char inset or a full word
1067                 if (pos != 0 && par.isWordSeparator(pos - 1) && !par.isChar(pos - 1))
1068                         --pos;
1069                 else while (pos != 0 && !par.isWordSeparator(pos - 1))
1070                              --pos;
1071         } else {
1072                 // Skip over white space
1073                 while (pos != 0 && par.isSpace(pos - 1))
1074                              --pos;
1075
1076                 if (pos != 0 && !par.isWordSeparator(pos - 1))
1077                         while (pos != 0 && !par.isWordSeparator(pos - 1))
1078                                 --pos;
1079                 else if (pos != 0 && par.isChar(pos - 1))
1080                         while (pos != 0 && par.isChar(pos - 1))
1081                                 --pos;
1082                 else if (pos != 0 && !par.isSpace(pos - 1)) // non-char inset
1083                         --pos;
1084         }
1085
1086         return setCursor(cur, pit, pos);
1087 }
1088
1089
1090 bool Text::cursorVisLeftOneWord(Cursor & cur)
1091 {
1092         LASSERT(this == cur.text(), /**/);
1093
1094         pos_type left_pos, right_pos;
1095         bool left_is_letter, right_is_letter;
1096
1097         Cursor temp_cur = cur;
1098
1099         // always try to move at least once...
1100         while (temp_cur.posVisLeft(true /* skip_inset */)) {
1101
1102                 // collect some information about current cursor position
1103                 temp_cur.getSurroundingPos(left_pos, right_pos);
1104                 left_is_letter =
1105                         (left_pos > -1 ? !temp_cur.paragraph().isWordSeparator(left_pos) : false);
1106                 right_is_letter =
1107                         (right_pos > -1 ? !temp_cur.paragraph().isWordSeparator(right_pos) : false);
1108
1109                 // if we're not at a letter/non-letter boundary, continue moving
1110                 if (left_is_letter == right_is_letter)
1111                         continue;
1112
1113                 // we should stop when we have an LTR word on our right or an RTL word
1114                 // on our left
1115                 if ((left_is_letter && temp_cur.paragraph().getFontSettings(
1116                                 temp_cur.buffer()->params(), left_pos).isRightToLeft())
1117                         || (right_is_letter && !temp_cur.paragraph().getFontSettings(
1118                                 temp_cur.buffer()->params(), right_pos).isRightToLeft()))
1119                         break;
1120         }
1121
1122         return setCursor(cur, temp_cur.pit(), temp_cur.pos(),
1123                                          true, temp_cur.boundary());
1124 }
1125
1126
1127 bool Text::cursorVisRightOneWord(Cursor & cur)
1128 {
1129         LASSERT(this == cur.text(), /**/);
1130
1131         pos_type left_pos, right_pos;
1132         bool left_is_letter, right_is_letter;
1133
1134         Cursor temp_cur = cur;
1135
1136         // always try to move at least once...
1137         while (temp_cur.posVisRight(true /* skip_inset */)) {
1138
1139                 // collect some information about current cursor position
1140                 temp_cur.getSurroundingPos(left_pos, right_pos);
1141                 left_is_letter =
1142                         (left_pos > -1 ? !temp_cur.paragraph().isWordSeparator(left_pos) : false);
1143                 right_is_letter =
1144                         (right_pos > -1 ? !temp_cur.paragraph().isWordSeparator(right_pos) : false);
1145
1146                 // if we're not at a letter/non-letter boundary, continue moving
1147                 if (left_is_letter == right_is_letter)
1148                         continue;
1149
1150                 // we should stop when we have an LTR word on our right or an RTL word
1151                 // on our left
1152                 if ((left_is_letter && temp_cur.paragraph().getFontSettings(
1153                                 temp_cur.buffer()->params(),
1154                                 left_pos).isRightToLeft())
1155                         || (right_is_letter && !temp_cur.paragraph().getFontSettings(
1156                                 temp_cur.buffer()->params(),
1157                                 right_pos).isRightToLeft()))
1158                         break;
1159         }
1160
1161         return setCursor(cur, temp_cur.pit(), temp_cur.pos(),
1162                                          true, temp_cur.boundary());
1163 }
1164
1165
1166 void Text::selectWord(Cursor & cur, word_location loc)
1167 {
1168         LASSERT(this == cur.text(), /**/);
1169         CursorSlice from = cur.top();
1170         CursorSlice to = cur.top();
1171         getWord(from, to, loc);
1172         if (cur.top() != from)
1173                 setCursor(cur, from.pit(), from.pos());
1174         if (to == from)
1175                 return;
1176         if (!cur.selection())
1177                 cur.resetAnchor();
1178         setCursor(cur, to.pit(), to.pos());
1179         cur.setSelection();
1180         cur.setWordSelection(true);
1181 }
1182
1183
1184 void Text::selectAll(Cursor & cur)
1185 {
1186         LASSERT(this == cur.text(), /**/);
1187         if (cur.lastpos() == 0 && cur.lastpit() == 0)
1188                 return;
1189         // If the cursor is at the beginning, make sure the cursor ends there
1190         if (cur.pit() == 0 && cur.pos() == 0) {
1191                 setCursor(cur, cur.lastpit(), getPar(cur.lastpit()).size());
1192                 cur.resetAnchor();
1193                 setCursor(cur, 0, 0);
1194         } else {
1195                 setCursor(cur, 0, 0);
1196                 cur.resetAnchor();
1197                 setCursor(cur, cur.lastpit(), getPar(cur.lastpit()).size());
1198         }
1199         cur.setSelection();
1200 }
1201
1202
1203 // Select the word currently under the cursor when no
1204 // selection is currently set
1205 bool Text::selectWordWhenUnderCursor(Cursor & cur, word_location loc)
1206 {
1207         LASSERT(this == cur.text(), /**/);
1208         if (cur.selection())
1209                 return false;
1210         selectWord(cur, loc);
1211         return cur.selection();
1212 }
1213
1214
1215 void Text::acceptOrRejectChanges(Cursor & cur, ChangeOp op)
1216 {
1217         LASSERT(this == cur.text(), /**/);
1218
1219         if (!cur.selection()) {
1220                 bool const changed = cur.paragraph().isChanged(cur.pos());
1221                 if (!(changed && findNextChange(&cur.bv())))
1222                         return;
1223         }
1224
1225         cur.recordUndoSelection();
1226
1227         pit_type begPit = cur.selectionBegin().pit();
1228         pit_type endPit = cur.selectionEnd().pit();
1229
1230         pos_type begPos = cur.selectionBegin().pos();
1231         pos_type endPos = cur.selectionEnd().pos();
1232
1233         // keep selection info, because endPos becomes invalid after the first loop
1234         bool endsBeforeEndOfPar = (endPos < pars_[endPit].size());
1235
1236         // first, accept/reject changes within each individual paragraph (do not consider end-of-par)
1237
1238         for (pit_type pit = begPit; pit <= endPit; ++pit) {
1239                 pos_type parSize = pars_[pit].size();
1240
1241                 // ignore empty paragraphs; otherwise, an assertion will fail for
1242                 // acceptChanges(bparams, 0, 0) or rejectChanges(bparams, 0, 0)
1243                 if (parSize == 0)
1244                         continue;
1245
1246                 // do not consider first paragraph if the cursor starts at pos size()
1247                 if (pit == begPit && begPos == parSize)
1248                         continue;
1249
1250                 // do not consider last paragraph if the cursor ends at pos 0
1251                 if (pit == endPit && endPos == 0)
1252                         break; // last iteration anyway
1253
1254                 pos_type left  = (pit == begPit ? begPos : 0);
1255                 pos_type right = (pit == endPit ? endPos : parSize);
1256
1257                 if (op == ACCEPT) {
1258                         pars_[pit].acceptChanges(left, right);
1259                 } else {
1260                         pars_[pit].rejectChanges(left, right);
1261                 }
1262         }
1263
1264         // next, accept/reject imaginary end-of-par characters
1265
1266         for (pit_type pit = begPit; pit <= endPit; ++pit) {
1267                 pos_type pos = pars_[pit].size();
1268
1269                 // skip if the selection ends before the end-of-par
1270                 if (pit == endPit && endsBeforeEndOfPar)
1271                         break; // last iteration anyway
1272
1273                 // skip if this is not the last paragraph of the document
1274                 // note: the user should be able to accept/reject the par break of the last par!
1275                 if (pit == endPit && pit + 1 != int(pars_.size()))
1276                         break; // last iteration anway
1277
1278                 if (op == ACCEPT) {
1279                         if (pars_[pit].isInserted(pos)) {
1280                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
1281                         } else if (pars_[pit].isDeleted(pos)) {
1282                                 if (pit + 1 == int(pars_.size())) {
1283                                         // we cannot remove a par break at the end of the last paragraph;
1284                                         // instead, we mark it unchanged
1285                                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
1286                                 } else {
1287                                         mergeParagraph(cur.buffer()->params(), pars_, pit);
1288                                         --endPit;
1289                                         --pit;
1290                                 }
1291                         }
1292                 } else {
1293                         if (pars_[pit].isDeleted(pos)) {
1294                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
1295                         } else if (pars_[pit].isInserted(pos)) {
1296                                 if (pit + 1 == int(pars_.size())) {
1297                                         // we mark the par break at the end of the last paragraph unchanged
1298                                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
1299                                 } else {
1300                                         mergeParagraph(cur.buffer()->params(), pars_, pit);
1301                                         --endPit;
1302                                         --pit;
1303                                 }
1304                         }
1305                 }
1306         }
1307
1308         // finally, invoke the DEPM
1309
1310         deleteEmptyParagraphMechanism(begPit, endPit, cur.buffer()->params().trackChanges);
1311
1312         //
1313
1314         cur.finishUndo();
1315         cur.clearSelection();
1316         setCursorIntern(cur, begPit, begPos);
1317         cur.screenUpdateFlags(Update::Force);
1318         cur.forceBufferUpdate();
1319 }
1320
1321
1322 void Text::acceptChanges()
1323 {
1324         BufferParams const & bparams = owner_->buffer().params();
1325         lyx::acceptChanges(pars_, bparams);
1326         deleteEmptyParagraphMechanism(0, pars_.size() - 1, bparams.trackChanges);
1327 }
1328
1329
1330 void Text::rejectChanges()
1331 {
1332         BufferParams const & bparams = owner_->buffer().params();
1333         pit_type pars_size = static_cast<pit_type>(pars_.size());
1334
1335         // first, reject changes within each individual paragraph
1336         // (do not consider end-of-par)
1337         for (pit_type pit = 0; pit < pars_size; ++pit) {
1338                 if (!pars_[pit].empty())   // prevent assertion failure
1339                         pars_[pit].rejectChanges(0, pars_[pit].size());
1340         }
1341
1342         // next, reject imaginary end-of-par characters
1343         for (pit_type pit = 0; pit < pars_size; ++pit) {
1344                 pos_type pos = pars_[pit].size();
1345
1346                 if (pars_[pit].isDeleted(pos)) {
1347                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
1348                 } else if (pars_[pit].isInserted(pos)) {
1349                         if (pit == pars_size - 1) {
1350                                 // we mark the par break at the end of the last
1351                                 // paragraph unchanged
1352                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
1353                         } else {
1354                                 mergeParagraph(bparams, pars_, pit);
1355                                 --pit;
1356                                 --pars_size;
1357                         }
1358                 }
1359         }
1360
1361         // finally, invoke the DEPM
1362         deleteEmptyParagraphMechanism(0, pars_size - 1, bparams.trackChanges);
1363 }
1364
1365
1366 void Text::deleteWordForward(Cursor & cur)
1367 {
1368         LASSERT(this == cur.text(), /**/);
1369         if (cur.lastpos() == 0)
1370                 cursorForward(cur);
1371         else {
1372                 cur.resetAnchor();
1373                 cur.setSelection(true);
1374                 cursorForwardOneWord(cur);
1375                 cur.setSelection();
1376                 cutSelection(cur, true, false);
1377                 cur.checkBufferStructure();
1378         }
1379 }
1380
1381
1382 void Text::deleteWordBackward(Cursor & cur)
1383 {
1384         LASSERT(this == cur.text(), /**/);
1385         if (cur.lastpos() == 0)
1386                 cursorBackward(cur);
1387         else {
1388                 cur.resetAnchor();
1389                 cur.setSelection(true);
1390                 cursorBackwardOneWord(cur);
1391                 cur.setSelection();
1392                 cutSelection(cur, true, false);
1393                 cur.checkBufferStructure();
1394         }
1395 }
1396
1397
1398 // Kill to end of line.
1399 void Text::changeCase(Cursor & cur, TextCase action)
1400 {
1401         LASSERT(this == cur.text(), /**/);
1402         CursorSlice from;
1403         CursorSlice to;
1404
1405         bool gotsel = false;
1406         if (cur.selection()) {
1407                 from = cur.selBegin();
1408                 to = cur.selEnd();
1409                 gotsel = true;
1410         } else {
1411                 from = cur.top();
1412                 getWord(from, to, PARTIAL_WORD);
1413                 cursorForwardOneWord(cur);
1414         }
1415
1416         cur.recordUndoSelection();
1417
1418         pit_type begPit = from.pit();
1419         pit_type endPit = to.pit();
1420
1421         pos_type begPos = from.pos();
1422         pos_type endPos = to.pos();
1423
1424         pos_type right = 0; // needed after the for loop
1425
1426         for (pit_type pit = begPit; pit <= endPit; ++pit) {
1427                 Paragraph & par = pars_[pit];
1428                 pos_type const pos = (pit == begPit ? begPos : 0);
1429                 right = (pit == endPit ? endPos : par.size());
1430                 par.changeCase(cur.buffer()->params(), pos, right, action);
1431         }
1432
1433         // the selection may have changed due to logically-only deleted chars
1434         if (gotsel) {
1435                 setCursor(cur, begPit, begPos);
1436                 cur.resetAnchor();
1437                 setCursor(cur, endPit, right);
1438                 cur.setSelection();
1439         } else
1440                 setCursor(cur, endPit, right);
1441
1442         cur.checkBufferStructure();
1443 }
1444
1445
1446 bool Text::handleBibitems(Cursor & cur)
1447 {
1448         if (cur.paragraph().layout().labeltype != LABEL_BIBLIO)
1449                 return false;
1450
1451         if (cur.pos() != 0)
1452                 return false;
1453
1454         BufferParams const & bufparams = cur.buffer()->params();
1455         Paragraph const & par = cur.paragraph();
1456         Cursor prevcur = cur;
1457         if (cur.pit() > 0) {
1458                 --prevcur.pit();
1459                 prevcur.pos() = prevcur.lastpos();
1460         }
1461         Paragraph const & prevpar = prevcur.paragraph();
1462
1463         // if a bibitem is deleted, merge with previous paragraph
1464         // if this is a bibliography item as well
1465         if (cur.pit() > 0 && par.layout() == prevpar.layout()) {
1466                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit());
1467                 mergeParagraph(bufparams, cur.text()->paragraphs(),
1468                                                         prevcur.pit());
1469                 cur.forceBufferUpdate();
1470                 setCursorIntern(cur, prevcur.pit(), prevcur.pos());
1471                 cur.screenUpdateFlags(Update::Force);
1472                 return true;
1473         }
1474
1475         // otherwise reset to default
1476         cur.paragraph().setPlainOrDefaultLayout(bufparams.documentClass());
1477         return true;
1478 }
1479
1480
1481 bool Text::erase(Cursor & cur)
1482 {
1483         LASSERT(this == cur.text(), return false);
1484         bool needsUpdate = false;
1485         Paragraph & par = cur.paragraph();
1486
1487         if (cur.pos() != cur.lastpos()) {
1488                 // this is the code for a normal delete, not pasting
1489                 // any paragraphs
1490                 cur.recordUndo(DELETE_UNDO);
1491                 bool const was_inset = cur.paragraph().isInset(cur.pos());
1492                 if(!par.eraseChar(cur.pos(), cur.buffer()->params().trackChanges))
1493                         // the character has been logically deleted only => skip it
1494                         cur.top().forwardPos();
1495
1496                 if (was_inset)
1497                         cur.forceBufferUpdate();
1498                 else
1499                         cur.checkBufferStructure();
1500                 needsUpdate = true;
1501         } else {
1502                 if (cur.pit() == cur.lastpit())
1503                         return dissolveInset(cur);
1504
1505                 if (!par.isMergedOnEndOfParDeletion(cur.buffer()->params().trackChanges)) {
1506                         par.setChange(cur.pos(), Change(Change::DELETED));
1507                         cur.forwardPos();
1508                         needsUpdate = true;
1509                 } else {
1510                         setCursorIntern(cur, cur.pit() + 1, 0);
1511                         needsUpdate = backspacePos0(cur);
1512                 }
1513         }
1514
1515         needsUpdate |= handleBibitems(cur);
1516
1517         if (needsUpdate) {
1518                 // Make sure the cursor is correct. Is this really needed?
1519                 // No, not really... at least not here!
1520                 cur.text()->setCursor(cur.top(), cur.pit(), cur.pos());
1521                 cur.checkBufferStructure();
1522         }
1523
1524         return needsUpdate;
1525 }
1526
1527
1528 bool Text::backspacePos0(Cursor & cur)
1529 {
1530         LASSERT(this == cur.text(), /**/);
1531         if (cur.pit() == 0)
1532                 return false;
1533
1534         bool needsUpdate = false;
1535
1536         BufferParams const & bufparams = cur.buffer()->params();
1537         DocumentClass const & tclass = bufparams.documentClass();
1538         ParagraphList & plist = cur.text()->paragraphs();
1539         Paragraph const & par = cur.paragraph();
1540         Cursor prevcur = cur;
1541         --prevcur.pit();
1542         prevcur.pos() = prevcur.lastpos();
1543         Paragraph const & prevpar = prevcur.paragraph();
1544
1545         // is it an empty paragraph?
1546         if (cur.lastpos() == 0
1547             || (cur.lastpos() == 1 && par.isSeparator(0))) {
1548                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit(), cur.pit());
1549                 plist.erase(boost::next(plist.begin(), cur.pit()));
1550                 needsUpdate = true;
1551         }
1552         // is previous par empty?
1553         else if (prevcur.lastpos() == 0
1554                  || (prevcur.lastpos() == 1 && prevpar.isSeparator(0))) {
1555                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit(), cur.pit());
1556                 plist.erase(boost::next(plist.begin(), prevcur.pit()));
1557                 needsUpdate = true;
1558         }
1559         // Pasting is not allowed, if the paragraphs have different
1560         // layouts. I think it is a real bug of all other
1561         // word processors to allow it. It confuses the user.
1562         // Correction: Pasting is always allowed with standard-layout
1563         // or the empty layout.
1564         else if (par.layout() == prevpar.layout()
1565                  || tclass.isDefaultLayout(par.layout())
1566                  || tclass.isPlainLayout(par.layout())) {
1567                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit());
1568                 mergeParagraph(bufparams, plist, prevcur.pit());
1569                 needsUpdate = true;
1570         }
1571
1572         if (needsUpdate) {
1573                 cur.forceBufferUpdate();
1574                 setCursorIntern(cur, prevcur.pit(), prevcur.pos());
1575         }
1576
1577         return needsUpdate;
1578 }
1579
1580
1581 bool Text::backspace(Cursor & cur)
1582 {
1583         LASSERT(this == cur.text(), /**/);
1584         bool needsUpdate = false;
1585         if (cur.pos() == 0) {
1586                 if (cur.pit() == 0)
1587                         return dissolveInset(cur);
1588
1589                 Paragraph & prev_par = pars_[cur.pit() - 1];
1590
1591                 if (!prev_par.isMergedOnEndOfParDeletion(cur.buffer()->params().trackChanges)) {
1592                         prev_par.setChange(prev_par.size(), Change(Change::DELETED));
1593                         setCursorIntern(cur, cur.pit() - 1, prev_par.size());
1594                         return true;
1595                 }
1596                 // The cursor is at the beginning of a paragraph, so
1597                 // the backspace will collapse two paragraphs into one.
1598                 needsUpdate = backspacePos0(cur);
1599
1600         } else {
1601                 // this is the code for a normal backspace, not pasting
1602                 // any paragraphs
1603                 cur.recordUndo(DELETE_UNDO);
1604                 // We used to do cursorBackwardIntern() here, but it is
1605                 // not a good idea since it triggers the auto-delete
1606                 // mechanism. So we do a cursorBackwardIntern()-lite,
1607                 // without the dreaded mechanism. (JMarc)
1608                 setCursorIntern(cur, cur.pit(), cur.pos() - 1,
1609                                 false, cur.boundary());
1610                 bool const was_inset = cur.paragraph().isInset(cur.pos());
1611                 cur.paragraph().eraseChar(cur.pos(), cur.buffer()->params().trackChanges);
1612                 if (was_inset)
1613                         cur.forceBufferUpdate();
1614                 else
1615                         cur.checkBufferStructure();
1616         }
1617
1618         if (cur.pos() == cur.lastpos())
1619                 cur.setCurrentFont();
1620
1621         needsUpdate |= handleBibitems(cur);
1622
1623         // A singlePar update is not enough in this case.
1624 //              cur.screenUpdateFlags(Update::Force);
1625         setCursor(cur.top(), cur.pit(), cur.pos());
1626
1627         return needsUpdate;
1628 }
1629
1630
1631 bool Text::dissolveInset(Cursor & cur)
1632 {
1633         LASSERT(this == cur.text(), return false);
1634
1635         if (isMainText() || cur.inset().nargs() != 1)
1636                 return false;
1637
1638         cur.recordUndoInset();
1639         cur.setMark(false);
1640         cur.selHandle(false);
1641         // save position
1642         pos_type spos = cur.pos();
1643         pit_type spit = cur.pit();
1644         ParagraphList plist;
1645         if (cur.lastpit() != 0 || cur.lastpos() != 0)
1646                 plist = paragraphs();
1647         cur.popBackward();
1648         // store cursor offset
1649         if (spit == 0)
1650                 spos += cur.pos();
1651         spit += cur.pit();
1652         Buffer & b = *cur.buffer();
1653         cur.paragraph().eraseChar(cur.pos(), b.params().trackChanges);
1654         if (!plist.empty()) {
1655                 // ERT paragraphs have the Language latex_language.
1656                 // This is invalid outside of ERT, so we need to
1657                 // change it to the buffer language.
1658                 ParagraphList::iterator it = plist.begin();
1659                 ParagraphList::iterator it_end = plist.end();
1660                 for (; it != it_end; it++)
1661                         it->changeLanguage(b.params(), latex_language, b.language());
1662
1663                 pasteParagraphList(cur, plist, b.params().documentClassPtr(),
1664                                    b.errorList("Paste"));
1665                 // restore position
1666                 cur.pit() = min(cur.lastpit(), spit);
1667                 cur.pos() = min(cur.lastpos(), spos);
1668         } else
1669                 cur.forceBufferUpdate();
1670
1671         // Ensure the current language is set correctly (bug 6292)
1672         cur.text()->setCursor(cur, cur.pit(), cur.pos());
1673         cur.clearSelection();
1674         cur.resetAnchor();
1675         return true;
1676 }
1677
1678
1679 void Text::getWord(CursorSlice & from, CursorSlice & to,
1680         word_location const loc) const
1681 {
1682         to = from;
1683         pars_[to.pit()].locateWord(from.pos(), to.pos(), loc);
1684 }
1685
1686
1687 void Text::write(ostream & os) const
1688 {
1689         Buffer const & buf = owner_->buffer();
1690         ParagraphList::const_iterator pit = paragraphs().begin();
1691         ParagraphList::const_iterator end = paragraphs().end();
1692         depth_type dth = 0;
1693         for (; pit != end; ++pit)
1694                 pit->write(os, buf.params(), dth);
1695
1696         // Close begin_deeper
1697         for(; dth > 0; --dth)
1698                 os << "\n\\end_deeper";
1699 }
1700
1701
1702 bool Text::read(Lexer & lex,
1703                 ErrorList & errorList, InsetText * insetPtr)
1704 {
1705         Buffer const & buf = owner_->buffer();
1706         depth_type depth = 0;
1707         bool res = true;
1708
1709         while (lex.isOK()) {
1710                 lex.nextToken();
1711                 string const token = lex.getString();
1712
1713                 if (token.empty())
1714                         continue;
1715
1716                 if (token == "\\end_inset")
1717                         break;
1718
1719                 if (token == "\\end_body")
1720                         continue;
1721
1722                 if (token == "\\begin_body")
1723                         continue;
1724
1725                 if (token == "\\end_document") {
1726                         res = false;
1727                         break;
1728                 }
1729
1730                 if (token == "\\begin_layout") {
1731                         lex.pushToken(token);
1732
1733                         Paragraph par;
1734                         par.setInsetOwner(insetPtr);
1735                         par.params().depth(depth);
1736                         par.setFont(0, Font(inherit_font, buf.params().language));
1737                         pars_.push_back(par);
1738                         readParagraph(pars_.back(), lex, errorList);
1739
1740                         // register the words in the global word list
1741                         pars_.back().updateWords();
1742                 } else if (token == "\\begin_deeper") {
1743                         ++depth;
1744                 } else if (token == "\\end_deeper") {
1745                         if (!depth)
1746                                 lex.printError("\\end_deeper: " "depth is already null");
1747                         else
1748                                 --depth;
1749                 } else {
1750                         LYXERR0("Handling unknown body token: `" << token << '\'');
1751                 }
1752         }
1753
1754         // avoid a crash on weird documents (bug 4859)
1755         if (pars_.empty()) {
1756                 Paragraph par;
1757                 par.setInsetOwner(insetPtr);
1758                 par.params().depth(depth);
1759                 par.setFont(0, Font(inherit_font,
1760                                     buf.params().language));
1761                 par.setPlainOrDefaultLayout(buf.params().documentClass());
1762                 pars_.push_back(par);
1763         }
1764
1765         return res;
1766 }
1767
1768 // Returns the current font and depth as a message.
1769 docstring Text::currentState(Cursor const & cur) const
1770 {
1771         LASSERT(this == cur.text(), /**/);
1772         Buffer & buf = *cur.buffer();
1773         Paragraph const & par = cur.paragraph();
1774         odocstringstream os;
1775
1776         if (buf.params().trackChanges)
1777                 os << _("[Change Tracking] ");
1778
1779         Change change = par.lookupChange(cur.pos());
1780
1781         if (change.changed()) {
1782                 Author const & a = buf.params().authors().get(change.author);
1783                 os << _("Change: ") << a.name();
1784                 if (!a.email().empty())
1785                         os << " (" << a.email() << ")";
1786                 // FIXME ctime is english, we should translate that
1787                 os << _(" at ") << ctime(&change.changetime);
1788                 os << " : ";
1789         }
1790
1791         // I think we should only show changes from the default
1792         // font. (Asger)
1793         // No, from the document font (MV)
1794         Font font = cur.real_current_font;
1795         font.fontInfo().reduce(buf.params().getFont().fontInfo());
1796
1797         os << bformat(_("Font: %1$s"), font.stateText(&buf.params()));
1798
1799         // The paragraph depth
1800         int depth = cur.paragraph().getDepth();
1801         if (depth > 0)
1802                 os << bformat(_(", Depth: %1$d"), depth);
1803
1804         // The paragraph spacing, but only if different from
1805         // buffer spacing.
1806         Spacing const & spacing = par.params().spacing();
1807         if (!spacing.isDefault()) {
1808                 os << _(", Spacing: ");
1809                 switch (spacing.getSpace()) {
1810                 case Spacing::Single:
1811                         os << _("Single");
1812                         break;
1813                 case Spacing::Onehalf:
1814                         os << _("OneHalf");
1815                         break;
1816                 case Spacing::Double:
1817                         os << _("Double");
1818                         break;
1819                 case Spacing::Other:
1820                         os << _("Other (") << from_ascii(spacing.getValueAsString()) << ')';
1821                         break;
1822                 case Spacing::Default:
1823                         // should never happen, do nothing
1824                         break;
1825                 }
1826         }
1827
1828 #ifdef DEVEL_VERSION
1829         os << _(", Inset: ") << &cur.inset();
1830         os << _(", Paragraph: ") << cur.pit();
1831         os << _(", Id: ") << par.id();
1832         os << _(", Position: ") << cur.pos();
1833         // FIXME: Why is the check for par.size() needed?
1834         // We are called with cur.pos() == par.size() quite often.
1835         if (!par.empty() && cur.pos() < par.size()) {
1836                 // Force output of code point, not character
1837                 size_t const c = par.getChar(cur.pos());
1838                 os << _(", Char: 0x") << hex << c;
1839         }
1840         os << _(", Boundary: ") << cur.boundary();
1841 //      Row & row = cur.textRow();
1842 //      os << bformat(_(", Row b:%1$d e:%2$d"), row.pos(), row.endpos());
1843 #endif
1844         return os.str();
1845 }
1846
1847
1848 docstring Text::getPossibleLabel(Cursor const & cur) const
1849 {
1850         pit_type pit = cur.pit();
1851
1852         Layout const * layout = &(pars_[pit].layout());
1853
1854         docstring text;
1855         docstring par_text = pars_[pit].asString();
1856
1857         // The return string of math matrices might contain linebreaks
1858         par_text = subst(par_text, '\n', '-');
1859         int const numwords = 3;
1860         for (int i = 0; i < numwords; ++i) {
1861                 if (par_text.empty())
1862                         break;
1863                 docstring head;
1864                 par_text = split(par_text, head, ' ');
1865                 // Is it legal to use spaces in labels ?
1866                 if (i > 0)
1867                         text += '-';
1868                 text += head;
1869         }
1870
1871         // Make sure it isn't too long
1872         unsigned int const max_label_length = 32;
1873         if (text.size() > max_label_length)
1874                 text.resize(max_label_length);
1875
1876         // Will contain the label prefix.
1877         docstring name;
1878
1879         // For section, subsection, etc...
1880         if (layout->latextype == LATEX_PARAGRAPH && pit != 0) {
1881                 Layout const * layout2 = &(pars_[pit - 1].layout());
1882                 if (layout2->latextype != LATEX_PARAGRAPH) {
1883                         --pit;
1884                         layout = layout2;
1885                 }
1886         }
1887         if (layout->latextype != LATEX_PARAGRAPH)
1888                 name = layout->refprefix;
1889
1890         // For captions, we just take the caption type
1891         Inset * caption_inset = cur.innerInsetOfType(CAPTION_CODE);
1892         if (caption_inset) {
1893                 string const & ftype = static_cast<InsetCaption *>(caption_inset)->type();
1894                 FloatList const & fl = cur.buffer()->params().documentClass().floats();
1895                 if (fl.typeExist(ftype)) {
1896                         Floating const & flt = fl.getType(ftype);
1897                         name = from_utf8(flt.refPrefix());
1898                 }
1899                 if (name.empty())
1900                         name = from_utf8(ftype.substr(0,3));
1901         }
1902
1903         // If none of the above worked, see if the inset knows.
1904         if (name.empty()) {
1905                 InsetLayout const & il = cur.inset().getLayout();
1906                 name = il.refprefix();
1907         }
1908
1909         if (!name.empty())
1910                 // FIXME refstyle
1911                 // We should allow customization of the separator or else change it
1912                 text = name + ':' + text;
1913
1914         return text;
1915 }
1916
1917
1918 docstring Text::asString(int options) const
1919 {
1920         return asString(0, pars_.size(), options);
1921 }
1922
1923
1924 docstring Text::asString(pit_type beg, pit_type end, int options) const
1925 {
1926         size_t i = size_t(beg);
1927         docstring str = pars_[i].asString(options);
1928         for (++i; i != size_t(end); ++i) {
1929                 str += '\n';
1930                 str += pars_[i].asString(options);
1931         }
1932         return str;
1933 }
1934
1935
1936
1937 void Text::charsTranspose(Cursor & cur)
1938 {
1939         LASSERT(this == cur.text(), /**/);
1940
1941         pos_type pos = cur.pos();
1942
1943         // If cursor is at beginning or end of paragraph, do nothing.
1944         if (pos == cur.lastpos() || pos == 0)
1945                 return;
1946
1947         Paragraph & par = cur.paragraph();
1948
1949         // Get the positions of the characters to be transposed.
1950         pos_type pos1 = pos - 1;
1951         pos_type pos2 = pos;
1952
1953         // In change tracking mode, ignore deleted characters.
1954         while (pos2 < cur.lastpos() && par.isDeleted(pos2))
1955                 ++pos2;
1956         if (pos2 == cur.lastpos())
1957                 return;
1958
1959         while (pos1 >= 0 && par.isDeleted(pos1))
1960                 --pos1;
1961         if (pos1 < 0)
1962                 return;
1963
1964         // Don't do anything if one of the "characters" is not regular text.
1965         if (par.isInset(pos1) || par.isInset(pos2))
1966                 return;
1967
1968         // Store the characters to be transposed (including font information).
1969         char_type const char1 = par.getChar(pos1);
1970         Font const font1 =
1971                 par.getFontSettings(cur.buffer()->params(), pos1);
1972
1973         char_type const char2 = par.getChar(pos2);
1974         Font const font2 =
1975                 par.getFontSettings(cur.buffer()->params(), pos2);
1976
1977         // And finally, we are ready to perform the transposition.
1978         // Track the changes if Change Tracking is enabled.
1979         bool const trackChanges = cur.buffer()->params().trackChanges;
1980
1981         cur.recordUndo();
1982
1983         par.eraseChar(pos2, trackChanges);
1984         par.eraseChar(pos1, trackChanges);
1985         par.insertChar(pos1, char2, font2, trackChanges);
1986         par.insertChar(pos2, char1, font1, trackChanges);
1987
1988         cur.checkBufferStructure();
1989
1990         // After the transposition, move cursor to after the transposition.
1991         setCursor(cur, cur.pit(), pos2);
1992         cur.forwardPos();
1993 }
1994
1995
1996 DocIterator Text::macrocontextPosition() const
1997 {
1998         return macrocontext_position_;
1999 }
2000
2001
2002 void Text::setMacrocontextPosition(DocIterator const & pos)
2003 {
2004         macrocontext_position_ = pos;
2005 }
2006
2007
2008 docstring Text::previousWord(CursorSlice const & sl) const
2009 {
2010         CursorSlice from = sl;
2011         CursorSlice to = sl;
2012         getWord(from, to, PREVIOUS_WORD);
2013         if (sl == from || to == from)
2014                 return docstring();
2015
2016         Paragraph const & par = sl.paragraph();
2017         return par.asString(from.pos(), to.pos());
2018 }
2019
2020
2021 bool Text::completionSupported(Cursor const & cur) const
2022 {
2023         Paragraph const & par = cur.paragraph();
2024         return cur.pos() > 0
2025                 && (cur.pos() >= par.size() || par.isWordSeparator(cur.pos()))
2026                 && !par.isWordSeparator(cur.pos() - 1);
2027 }
2028
2029
2030 CompletionList const * Text::createCompletionList(Cursor const & cur) const
2031 {
2032         WordList const * list = theWordList(*cur.getFont().language());
2033         return new TextCompletionList(cur, list);
2034 }
2035
2036
2037 bool Text::insertCompletion(Cursor & cur, docstring const & s, bool /*finished*/)
2038 {
2039         LASSERT(cur.bv().cursor() == cur, /**/);
2040         cur.insert(s);
2041         cur.bv().cursor() = cur;
2042         if (!(cur.result().update() & Update::Force))
2043                 cur.screenUpdateFlags(cur.result().update() | Update::SinglePar);
2044         return true;
2045 }
2046
2047
2048 docstring Text::completionPrefix(Cursor const & cur) const
2049 {
2050         return previousWord(cur.top());
2051 }
2052
2053 } // namespace lyx