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/InsetNewline.h"
  57 #include "insets/InsetNewpage.h"
  58 #include "insets/InsetArgument.h"
  59 #include "insets/InsetSpace.h"
  60 #include "insets/InsetSpecialChar.h"
  61 #include "insets/InsetTabular.h"
  62
  63 #include "support/debug.h"
  64 #include "support/docstream.h"
  65 #include "support/gettext.h"
  66 #include "support/lassert.h"
  67 #include "support/lstrings.h"
  68 #include "support/textutils.h"
  69
  70 #include <boost/next_prior.hpp>
  71
  72 #include <sstream>
  73
  74 using namespace std;
  75 using namespace lyx::support;
  76
  77 namespace lyx {
  78
  79 using cap::cutSelection;
  80 using cap::pasteParagraphList;
  81
  82 static bool moveItem(Paragraph & fromPar, pos_type fromPos,
  83         Paragraph & toPar, pos_type toPos, BufferParams const & params)
  84 {
  85         // Note: moveItem() does not honour change tracking!
  86         // Therefore, it should only be used for breaking and merging paragraphs
  87
  88         // We need a copy here because the character at fromPos is going to be erased.
  89         Font const tmpFont = fromPar.getFontSettings(params, fromPos);
  90         Change const tmpChange = fromPar.lookupChange(fromPos);
  91
  92         if (Inset * tmpInset = fromPar.getInset(fromPos)) {
  93                 fromPar.releaseInset(fromPos);
  94                 // The inset is not in fromPar any more.
  95                 if (!toPar.insertInset(toPos, tmpInset, tmpFont, tmpChange)) {
  96                         delete tmpInset;
  97                         return false;
  98                 }
  99                 return true;
 100         }
 101
 102         char_type const tmpChar = fromPar.getChar(fromPos);
 103         fromPar.eraseChar(fromPos, false);
 104         toPar.insertChar(toPos, tmpChar, tmpFont, tmpChange);
 105         return true;
 106 }
 107
 108
 109 void breakParagraphConservative(BufferParams const & bparams,
 110         ParagraphList & pars, pit_type par_offset, pos_type pos)
 111 {
 112         // create a new paragraph
 113         Paragraph & tmp = *pars.insert(boost::next(pars.begin(), par_offset + 1),
 114                                        Paragraph());
 115         Paragraph & par = pars[par_offset];
 116
 117         tmp.setInsetOwner(&par.inInset());
 118         tmp.makeSameLayout(par);
 119
 120         LASSERT(pos <= par.size(), /**/);
 121
 122         if (pos < par.size()) {
 123                 // move everything behind the break position to the new paragraph
 124                 pos_type pos_end = par.size() - 1;
 125
 126                 for (pos_type i = pos, j = 0; i <= pos_end; ++i) {
 127                         if (moveItem(par, pos, tmp, j, bparams)) {
 128                                 ++j;
 129                         }
 130                 }
 131                 // Move over the end-of-par change information
 132                 tmp.setChange(tmp.size(), par.lookupChange(par.size()));
 133                 par.setChange(par.size(), Change(bparams.trackChanges ?
 134                                            Change::INSERTED : Change::UNCHANGED));
 135         }
 136 }
 137
 138
 139 void mergeParagraph(BufferParams const & bparams,
 140         ParagraphList & pars, pit_type par_offset)
 141 {
 142         Paragraph & next = pars[par_offset + 1];
 143         Paragraph & par = pars[par_offset];
 144
 145         pos_type pos_end = next.size() - 1;
 146         pos_type pos_insert = par.size();
 147
 148         // the imaginary end-of-paragraph character (at par.size()) has to be
 149         // marked as unmodified. Otherwise, its change is adopted by the first
 150         // character of the next paragraph.
 151         if (par.isChanged(par.size())) {
 152                 LYXERR(Debug::CHANGES,
 153                    "merging par with inserted/deleted end-of-par character");
 154                 par.setChange(par.size(), Change(Change::UNCHANGED));
 155         }
 156
 157         Change change = next.lookupChange(next.size());
 158
 159         // move the content of the second paragraph to the end of the first one
 160         for (pos_type i = 0, j = pos_insert; i <= pos_end; ++i) {
 161                 if (moveItem(next, 0, par, j, bparams)) {
 162                         ++j;
 163                 }
 164         }
 165
 166         // move the change of the end-of-paragraph character
 167         par.setChange(par.size(), change);
 168
 169         pars.erase(boost::next(pars.begin(), par_offset + 1));
 170 }
 171
 172
 173 Text::Text(InsetText * owner, bool use_default_layout)
 174         : owner_(owner), autoBreakRows_(false), undo_counter_(0)
 175 {
 176         pars_.push_back(Paragraph());
 177         Paragraph & par = pars_.back();
 178         par.setInsetOwner(owner);
 179         DocumentClass const & dc = owner->buffer().params().documentClass();
 180         if (use_default_layout)
 181                 par.setDefaultLayout(dc);
 182         else
 183                 par.setPlainLayout(dc);
 184 }
 185
 186
 187 Text::Text(InsetText * owner, Text const & text)
 188         : owner_(owner), autoBreakRows_(text.autoBreakRows_), undo_counter_(0)
 189 {
 190         pars_ = text.pars_;
 191         ParagraphList::iterator const end = pars_.end();
 192         ParagraphList::iterator it = pars_.begin();
 193         for (; it != end; ++it)
 194                 it->setInsetOwner(owner);
 195 }
 196
 197
 198 pit_type Text::depthHook(pit_type pit, depth_type depth) const
 199 {
 200         pit_type newpit = pit;
 201
 202         if (newpit != 0)
 203                 --newpit;
 204
 205         while (newpit != 0 && pars_[newpit].getDepth() > depth)
 206                 --newpit;
 207
 208         if (pars_[newpit].getDepth() > depth)
 209                 return pit;
 210
 211         return newpit;
 212 }
 213
 214
 215 pit_type Text::outerHook(pit_type par_offset) const
 216 {
 217         Paragraph const & par = pars_[par_offset];
 218
 219         if (par.getDepth() == 0)
 220                 return pars_.size();
 221         return depthHook(par_offset, depth_type(par.getDepth() - 1));
 222 }
 223
 224
 225 bool Text::isFirstInSequence(pit_type par_offset) const
 226 {
 227         Paragraph const & par = pars_[par_offset];
 228
 229         pit_type dhook_offset = depthHook(par_offset, par.getDepth());
 230
 231         if (dhook_offset == par_offset)
 232                 return true;
 233
 234         Paragraph const & dhook = pars_[dhook_offset];
 235
 236         return dhook.layout() != par.layout()
 237                 || dhook.getDepth() != par.getDepth();
 238 }
 239
 240
 241 Font const Text::outerFont(pit_type par_offset) const
 242 {
 243         depth_type par_depth = pars_[par_offset].getDepth();
 244         FontInfo tmpfont = inherit_font;
 245
 246         // Resolve against environment font information
 247         while (par_offset != pit_type(pars_.size())
 248                && par_depth
 249                && !tmpfont.resolved()) {
 250                 par_offset = outerHook(par_offset);
 251                 if (par_offset != pit_type(pars_.size())) {
 252                         tmpfont.realize(pars_[par_offset].layout().font);
 253                         par_depth = pars_[par_offset].getDepth();
 254                 }
 255         }
 256
 257         return Font(tmpfont);
 258 }
 259
 260
 261 static void acceptOrRejectChanges(ParagraphList & pars,
 262         BufferParams const & bparams, Text::ChangeOp op)
 263 {
 264         pit_type pars_size = static_cast<pit_type>(pars.size());
 265
 266         // first, accept or reject changes within each individual
 267         // paragraph (do not consider end-of-par)
 268         for (pit_type pit = 0; pit < pars_size; ++pit) {
 269                 // prevent assertion failure
 270                 if (!pars[pit].empty()) {
 271                         if (op == Text::ACCEPT)
 272                                 pars[pit].acceptChanges(0, pars[pit].size());
 273                         else
 274                                 pars[pit].rejectChanges(0, pars[pit].size());
 275                 }
 276         }
 277
 278         // next, accept or reject imaginary end-of-par characters
 279         for (pit_type pit = 0; pit < pars_size; ++pit) {
 280                 pos_type pos = pars[pit].size();
 281                 if (pars[pit].isChanged(pos)) {
 282                         // keep the end-of-par char if it is inserted and accepted
 283                         // or when it is deleted and rejected.
 284                         if (pars[pit].isInserted(pos) == (op == Text::ACCEPT)) {
 285                                 pars[pit].setChange(pos, Change(Change::UNCHANGED));
 286                         } else {
 287                                 if (pit == pars_size - 1) {
 288                                         // we cannot remove a par break at the end of the last
 289                                         // paragraph; instead, we mark it unchanged
 290                                         pars[pit].setChange(pos, Change(Change::UNCHANGED));
 291                                 } else {
 292                                         mergeParagraph(bparams, pars, pit);
 293                                         --pit;
 294                                         --pars_size;
 295                                 }
 296                         }
 297                 }
 298         }
 299 }
 300
 301
 302 void acceptChanges(ParagraphList & pars, BufferParams const & bparams)
 303 {
 304         acceptOrRejectChanges(pars, bparams, Text::ACCEPT);
 305 }
 306
 307
 308 void rejectChanges(ParagraphList & pars, BufferParams const & bparams)
 309 {
 310         acceptOrRejectChanges(pars, bparams, Text::REJECT);
 311 }
 312
 313
 314 InsetText const & Text::inset() const
 315 {
 316         return *owner_;
 317 }
 318
 319
 320 void Text::readParToken(Paragraph & par, Lexer & lex,
 321         string const & token, Font & font, Change & change, ErrorList & errorList)
 322 {
 323         Buffer * buf = const_cast<Buffer *>(&owner_->buffer());
 324         BufferParams const & bp = buf->params();
 325
 326         if (token[0] != '\\') {
 327                 docstring dstr = lex.getDocString();
 328                 par.appendString(dstr, font, change);
 329
 330         } else if (token == "\\begin_layout") {
 331                 lex.eatLine();
 332                 docstring layoutname = lex.getDocString();
 333
 334                 font = Font(inherit_font, bp.language);
 335                 change = Change(Change::UNCHANGED);
 336
 337                 DocumentClass const & tclass = bp.documentClass();
 338
 339                 if (layoutname.empty())
 340                         layoutname = tclass.defaultLayoutName();
 341
 342                 if (owner_->forcePlainLayout()) {
 343                         // in this case only the empty layout is allowed
 344                         layoutname = tclass.plainLayoutName();
 345                 } else if (par.usePlainLayout()) {
 346                         // in this case, default layout maps to empty layout
 347                         if (layoutname == tclass.defaultLayoutName())
 348                                 layoutname = tclass.plainLayoutName();
 349                 } else {
 350                         // otherwise, the empty layout maps to the default
 351                         if (layoutname == tclass.plainLayoutName())
 352                                 layoutname = tclass.defaultLayoutName();
 353                 }
 354
 355                 // When we apply an unknown layout to a document, we add this layout to the textclass
 356                 // of this document. For example, when you apply class article to a beamer document,
 357                 // all unknown layouts such as frame will be added to document class article so that
 358                 // these layouts can keep their original names.
 359                 bool const added_one = tclass.addLayoutIfNeeded(layoutname);
 360                 if (added_one) {
 361                         // Warn the user.
 362                         docstring const s = bformat(_("Layout `%1$s' was not found."), layoutname);
 363                         errorList.push_back(
 364                                 ErrorItem(_("Layout Not Found"), s, par.id(), 0, par.size()));
 365                 }
 366
 367                 par.setLayout(bp.documentClass()[layoutname]);
 368
 369                 // Test whether the layout is obsolete.
 370                 Layout const & layout = par.layout();
 371                 if (!layout.obsoleted_by().empty())
 372                         par.setLayout(bp.documentClass()[layout.obsoleted_by()]);
 373
 374                 par.params().read(lex);
 375
 376         } else if (token == "\\end_layout") {
 377                 LYXERR0("Solitary \\end_layout in line " << lex.lineNumber() << "\n"
 378                        << "Missing \\begin_layout ?");
 379         } else if (token == "\\end_inset") {
 380                 LYXERR0("Solitary \\end_inset in line " << lex.lineNumber() << "\n"
 381                        << "Missing \\begin_inset ?");
 382         } else if (token == "\\begin_inset") {
 383                 Inset * inset = readInset(lex, buf);
 384                 if (inset)
 385                         par.insertInset(par.size(), inset, font, change);
 386                 else {
 387                         lex.eatLine();
 388                         docstring line = lex.getDocString();
 389                         errorList.push_back(ErrorItem(_("Unknown Inset"), line,
 390                                             par.id(), 0, par.size()));
 391                 }
 392         } else if (token == "\\family") {
 393                 lex.next();
 394                 setLyXFamily(lex.getString(), font.fontInfo());
 395         } else if (token == "\\series") {
 396                 lex.next();
 397                 setLyXSeries(lex.getString(), font.fontInfo());
 398         } else if (token == "\\shape") {
 399                 lex.next();
 400                 setLyXShape(lex.getString(), font.fontInfo());
 401         } else if (token == "\\size") {
 402                 lex.next();
 403                 setLyXSize(lex.getString(), font.fontInfo());
 404         } else if (token == "\\lang") {
 405                 lex.next();
 406                 string const tok = lex.getString();
 407                 Language const * lang = languages.getLanguage(tok);
 408                 if (lang) {
 409                         font.setLanguage(lang);
 410                 } else {
 411                         font.setLanguage(bp.language);
 412                         lex.printError("Unknown language `$$Token'");
 413                 }
 414         } else if (token == "\\numeric") {
 415                 lex.next();
 416                 font.fontInfo().setNumber(setLyXMisc(lex.getString()));
 417         } else if (token == "\\emph") {
 418                 lex.next();
 419                 font.fontInfo().setEmph(setLyXMisc(lex.getString()));
 420         } else if (token == "\\bar") {
 421                 lex.next();
 422                 string const tok = lex.getString();
 423
 424                 if (tok == "under")
 425                         font.fontInfo().setUnderbar(FONT_ON);
 426                 else if (tok == "no")
 427                         font.fontInfo().setUnderbar(FONT_OFF);
 428                 else if (tok == "default")
 429                         font.fontInfo().setUnderbar(FONT_INHERIT);
 430                 else
 431                         lex.printError("Unknown bar font flag "
 432                                        "`$$Token'");
 433         } else if (token == "\\strikeout") {
 434                 lex.next();
 435                 font.fontInfo().setStrikeout(setLyXMisc(lex.getString()));
 436         } else if (token == "\\uuline") {
 437                 lex.next();
 438                 font.fontInfo().setUuline(setLyXMisc(lex.getString()));
 439         } else if (token == "\\uwave") {
 440                 lex.next();
 441                 font.fontInfo().setUwave(setLyXMisc(lex.getString()));
 442         } else if (token == "\\noun") {
 443                 lex.next();
 444                 font.fontInfo().setNoun(setLyXMisc(lex.getString()));
 445         } else if (token == "\\color") {
 446                 lex.next();
 447                 setLyXColor(lex.getString(), font.fontInfo());
 448         } else if (token == "\\SpecialChar") {
 449                 auto_ptr<Inset> inset;
 450                 inset.reset(new InsetSpecialChar);
 451                 inset->read(lex);
 452                 inset->setBuffer(*buf);
 453                 par.insertInset(par.size(), inset.release(), font, change);
 454         } else if (token == "\\backslash") {
 455                 par.appendChar('\\', font, change);
 456         } else if (token == "\\LyXTable") {
 457                 auto_ptr<Inset> inset(new InsetTabular(buf));
 458                 inset->read(lex);
 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                 int aid;
 466                 time_t ct;
 467                 is >> aid >> ct;
 468                 BufferParams::AuthorMap 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         // mark paragraph for spell checking on load
 530         // par.requestSpellCheck();
 531 }
 532
 533
 534 class TextCompletionList : public CompletionList
 535 {
 536 public:
 537         ///
 538         TextCompletionList(Cursor const & cur, WordList const * list)
 539                 : buffer_(cur.buffer()), pos_(0), list_(list)
 540         {}
 541         ///
 542         virtual ~TextCompletionList() {}
 543
 544         ///
 545         virtual bool sorted() const { return true; }
 546         ///
 547         virtual size_t size() const
 548         {
 549                 return list_->size();
 550         }
 551         ///
 552         virtual docstring const & data(size_t idx) const
 553         {
 554                 return list_->word(idx);
 555         }
 556
 557 private:
 558         ///
 559         Buffer const * buffer_;
 560         ///
 561         size_t pos_;
 562         ///
 563         WordList const * list_;
 564 };
 565
 566
 567 bool Text::empty() const
 568 {
 569         return pars_.empty() || (pars_.size() == 1 && pars_[0].empty()
 570                 // FIXME: Should we consider the labeled type as empty too?
 571                 && pars_[0].layout().labeltype == LABEL_NO_LABEL);
 572 }
 573
 574
 575 double Text::spacing(Paragraph const & par) const
 576 {
 577         if (par.params().spacing().isDefault())
 578                 return owner_->buffer().params().spacing().getValue();
 579         return par.params().spacing().getValue();
 580 }
 581
 582
 583 /**
 584  * This breaks a paragraph at the specified position.
 585  * The new paragraph will:
 586  * - Decrease depth by one (or change layout to default layout) when
 587  *    keep_layout == false
 588  * - keep current depth and layout when keep_layout == true
 589  */
 590 static void breakParagraph(Text & text, pit_type par_offset, pos_type pos,
 591                     bool keep_layout)
 592 {
 593         BufferParams const & bparams = text.inset().buffer().params();
 594         ParagraphList & pars = text.paragraphs();
 595         // create a new paragraph, and insert into the list
 596         ParagraphList::iterator tmp =
 597                 pars.insert(boost::next(pars.begin(), par_offset + 1),
 598                             Paragraph());
 599
 600         Paragraph & par = pars[par_offset];
 601
 602         // remember to set the inset_owner
 603         tmp->setInsetOwner(&par.inInset());
 604         // without doing that we get a crash when typing <Return> at the
 605         // end of a paragraph
 606         tmp->setPlainOrDefaultLayout(bparams.documentClass());
 607
 608         if (keep_layout) {
 609                 tmp->setLayout(par.layout());
 610                 tmp->setLabelWidthString(par.params().labelWidthString());
 611                 tmp->params().depth(par.params().depth());
 612         } else if (par.params().depth() > 0) {
 613                 Paragraph const & hook = pars[text.outerHook(par_offset)];
 614                 tmp->setLayout(hook.layout());
 615                 // not sure the line below is useful
 616                 tmp->setLabelWidthString(par.params().labelWidthString());
 617                 tmp->params().depth(hook.params().depth());
 618         }
 619
 620         bool const isempty = (par.allowEmpty() && par.empty());
 621
 622         if (!isempty && (par.size() > pos || par.empty())) {
 623                 tmp->setLayout(par.layout());
 624                 tmp->params().align(par.params().align());
 625                 tmp->setLabelWidthString(par.params().labelWidthString());
 626
 627                 tmp->params().depth(par.params().depth());
 628                 tmp->params().noindent(par.params().noindent());
 629
 630                 // move everything behind the break position
 631                 // to the new paragraph
 632
 633                 /* Note: if !keepempty, empty() == true, then we reach
 634                  * here with size() == 0. So pos_end becomes - 1. This
 635                  * doesn't cause problems because both loops below
 636                  * enforce pos <= pos_end and 0 <= pos
 637                  */
 638                 pos_type pos_end = par.size() - 1;
 639
 640                 for (pos_type i = pos, j = 0; i <= pos_end; ++i) {
 641                         if (moveItem(par, pos, *tmp, j, bparams)) {
 642                                 ++j;
 643                         }
 644                 }
 645         }
 646
 647         // Move over the end-of-par change information
 648         tmp->setChange(tmp->size(), par.lookupChange(par.size()));
 649         par.setChange(par.size(), Change(bparams.trackChanges ?
 650                                            Change::INSERTED : Change::UNCHANGED));
 651
 652         if (pos) {
 653                 // Make sure that we keep the language when
 654                 // breaking paragraph.
 655                 if (tmp->empty()) {
 656                         Font changed = tmp->getFirstFontSettings(bparams);
 657                         Font const & old = par.getFontSettings(bparams, par.size());
 658                         changed.setLanguage(old.language());
 659                         tmp->setFont(0, changed);
 660                 }
 661
 662                 return;
 663         }
 664
 665         if (!isempty) {
 666                 bool const soa = par.params().startOfAppendix();
 667                 par.params().clear();
 668                 // do not lose start of appendix marker (bug 4212)
 669                 par.params().startOfAppendix(soa);
 670                 par.setPlainOrDefaultLayout(bparams.documentClass());
 671         }
 672
 673         if (keep_layout) {
 674                 par.setLayout(tmp->layout());
 675                 par.setLabelWidthString(tmp->params().labelWidthString());
 676                 par.params().depth(tmp->params().depth());
 677         }
 678 }
 679
 680
 681 void Text::breakParagraph(Cursor & cur, bool inverse_logic)
 682 {
 683         LASSERT(this == cur.text(), /**/);
 684
 685         Paragraph & cpar = cur.paragraph();
 686         pit_type cpit = cur.pit();
 687
 688         DocumentClass const & tclass = cur.buffer()->params().documentClass();
 689         Layout const & layout = cpar.layout();
 690
 691         if (cur.lastpos() == 0 && !cpar.allowEmpty()) {
 692                 if (changeDepthAllowed(cur, DEC_DEPTH))
 693                         changeDepth(cur, DEC_DEPTH);
 694                 else
 695                         setLayout(cur, tclass.defaultLayoutName());
 696                 return;
 697         }
 698
 699         // a layout change may affect also the following paragraph
 700         recUndo(cur, cur.pit(), undoSpan(cur.pit()) - 1);
 701
 702         // Always break behind a space
 703         // It is better to erase the space (Dekel)
 704         if (cur.pos() != cur.lastpos() && cpar.isLineSeparator(cur.pos()))
 705                 cpar.eraseChar(cur.pos(), cur.buffer()->params().trackChanges);
 706
 707         // What should the layout for the new paragraph be?
 708         bool keep_layout = layout.isEnvironment()
 709                 || (layout.isParagraph() && layout.parbreak_is_newline);
 710         if (inverse_logic)
 711                 keep_layout = !keep_layout;
 712
 713         // We need to remember this before we break the paragraph, because
 714         // that invalidates the layout variable
 715         bool sensitive = layout.labeltype == LABEL_SENSITIVE;
 716
 717         // we need to set this before we insert the paragraph.
 718         bool const isempty = cpar.allowEmpty() && cpar.empty();
 719
 720         lyx::breakParagraph(*this, cpit, cur.pos(), keep_layout);
 721
 722         // After this, neither paragraph contains any rows!
 723
 724         cpit = cur.pit();
 725         pit_type next_par = cpit + 1;
 726
 727         // well this is the caption hack since one caption is really enough
 728         if (sensitive) {
 729                 if (cur.pos() == 0)
 730                         // set to standard-layout
 731                 //FIXME Check if this should be plainLayout() in some cases
 732                         pars_[cpit].applyLayout(tclass.defaultLayout());
 733                 else
 734                         // set to standard-layout
 735                         //FIXME Check if this should be plainLayout() in some cases
 736                         pars_[next_par].applyLayout(tclass.defaultLayout());
 737         }
 738
 739         while (!pars_[next_par].empty() && pars_[next_par].isNewline(0)) {
 740                 if (!pars_[next_par].eraseChar(0, cur.buffer()->params().trackChanges))
 741                         break; // the character couldn't be deleted physically due to change tracking
 742         }
 743
 744         // A singlePar update is not enough in this case.
 745         cur.screenUpdateFlags(Update::Force);
 746         cur.forceBufferUpdate();
 747
 748         // This check is necessary. Otherwise the new empty paragraph will
 749         // be deleted automatically. And it is more friendly for the user!
 750         if (cur.pos() != 0 || isempty)
 751                 setCursor(cur, cur.pit() + 1, 0);
 752         else
 753                 setCursor(cur, cur.pit(), 0);
 754 }
 755
 756
 757 // needed to insert the selection
 758 void Text::insertStringAsLines(DocIterator const & dit, docstring const & str,
 759                 Font const & font)
 760 {
 761         BufferParams const & bparams = owner_->buffer().params();
 762         pit_type pit = dit.pit();
 763         pos_type pos = dit.pos();
 764
 765         // insert the string, don't insert doublespace
 766         bool space_inserted = true;
 767         for (docstring::const_iterator cit = str.begin();
 768             cit != str.end(); ++cit) {
 769                 Paragraph & par = pars_[pit];
 770                 if (*cit == '\n') {
 771                         if (autoBreakRows_ && (!par.empty() || par.allowEmpty())) {
 772                                 lyx::breakParagraph(*this, pit, pos,
 773                                         par.layout().isEnvironment());
 774                                 ++pit;
 775                                 pos = 0;
 776                                 space_inserted = true;
 777                         } else {
 778                                 continue;
 779                         }
 780                         // do not insert consecutive spaces if !free_spacing
 781                 } else if ((*cit == ' ' || *cit == '\t') &&
 782                            space_inserted && !par.isFreeSpacing()) {
 783                         continue;
 784                 } else if (*cit == '\t') {
 785                         if (!par.isFreeSpacing()) {
 786                                 // tabs are like spaces here
 787                                 par.insertChar(pos, ' ', font, bparams.trackChanges);
 788                                 ++pos;
 789                                 space_inserted = true;
 790                         } else {
 791                                 par.insertChar(pos, *cit, font, bparams.trackChanges);
 792                                 ++pos;
 793                                 space_inserted = true;
 794                         }
 795                 } else if (!isPrintable(*cit)) {
 796                         // Ignore unprintables
 797                         continue;
 798                 } else {
 799                         // just insert the character
 800                         par.insertChar(pos, *cit, font, bparams.trackChanges);
 801                         ++pos;
 802                         space_inserted = (*cit == ' ');
 803                 }
 804         }
 805 }
 806
 807
 808 // turn double CR to single CR, others are converted into one
 809 // blank. Then insertStringAsLines is called
 810 void Text::insertStringAsParagraphs(DocIterator const & dit, docstring const & str,
 811                 Font const & font)
 812 {
 813         docstring linestr = str;
 814         bool newline_inserted = false;
 815
 816         for (string::size_type i = 0, siz = linestr.size(); i < siz; ++i) {
 817                 if (linestr[i] == '\n') {
 818                         if (newline_inserted) {
 819                                 // we know that \r will be ignored by
 820                                 // insertStringAsLines. Of course, it is a dirty
 821                                 // trick, but it works...
 822                                 linestr[i - 1] = '\r';
 823                                 linestr[i] = '\n';
 824                         } else {
 825                                 linestr[i] = ' ';
 826                                 newline_inserted = true;
 827                         }
 828                 } else if (isPrintable(linestr[i])) {
 829                         newline_inserted = false;
 830                 }
 831         }
 832         insertStringAsLines(dit, linestr, font);
 833 }
 834
 835
 836 // insert a character, moves all the following breaks in the
 837 // same Paragraph one to the right and make a rebreak
 838 void Text::insertChar(Cursor & cur, char_type c)
 839 {
 840         LASSERT(this == cur.text(), /**/);
 841
 842         cur.recordUndo(INSERT_UNDO);
 843
 844         TextMetrics const & tm = cur.bv().textMetrics(this);
 845         Buffer const & buffer = *cur.buffer();
 846         Paragraph & par = cur.paragraph();
 847         // try to remove this
 848         pit_type const pit = cur.pit();
 849
 850         bool const freeSpacing = par.layout().free_spacing ||
 851                 par.isFreeSpacing();
 852
 853         if (lyxrc.auto_number) {
 854                 static docstring const number_operators = from_ascii("+-/*");
 855                 static docstring const number_unary_operators = from_ascii("+-");
 856                 static docstring const number_seperators = from_ascii(".,:");
 857
 858                 if (cur.current_font.fontInfo().number() == FONT_ON) {
 859                         if (!isDigitASCII(c) && !contains(number_operators, c) &&
 860                             !(contains(number_seperators, c) &&
 861                               cur.pos() != 0 &&
 862                               cur.pos() != cur.lastpos() &&
 863                               tm.displayFont(pit, cur.pos()).fontInfo().number() == FONT_ON &&
 864                               tm.displayFont(pit, cur.pos() - 1).fontInfo().number() == FONT_ON)
 865                            )
 866                                 number(cur); // Set current_font.number to OFF
 867                 } else if (isDigitASCII(c) &&
 868                            cur.real_current_font.isVisibleRightToLeft()) {
 869                         number(cur); // Set current_font.number to ON
 870
 871                         if (cur.pos() != 0) {
 872                                 char_type const c = par.getChar(cur.pos() - 1);
 873                                 if (contains(number_unary_operators, c) &&
 874                                     (cur.pos() == 1
 875                                      || par.isSeparator(cur.pos() - 2)
 876                                      || par.isNewline(cur.pos() - 2))
 877                                   ) {
 878                                         setCharFont(pit, cur.pos() - 1, cur.current_font,
 879                                                 tm.font_);
 880                                 } else if (contains(number_seperators, c)
 881                                      && cur.pos() >= 2
 882                                      && tm.displayFont(pit, cur.pos() - 2).fontInfo().number() == FONT_ON) {
 883                                         setCharFont(pit, cur.pos() - 1, cur.current_font,
 884                                                 tm.font_);
 885                                 }
 886                         }
 887                 }
 888         }
 889
 890         // In Bidi text, we want spaces to be treated in a special way: spaces
 891         // which are between words in different languages should get the
 892         // paragraph's language; otherwise, spaces should keep the language
 893         // they were originally typed in. This is only in effect while typing;
 894         // after the text is already typed in, the user can always go back and
 895         // explicitly set the language of a space as desired. But 99.9% of the
 896         // time, what we're doing here is what the user actually meant.
 897         //
 898         // The following cases are the ones in which the language of the space
 899         // should be changed to match that of the containing paragraph. In the
 900         // depictions, lowercase is LTR, uppercase is RTL, underscore (_)
 901         // represents a space, pipe (|) represents the cursor position (so the
 902         // character before it is the one just typed in). The different cases
 903         // are depicted logically (not visually), from left to right:
 904         //
 905         // 1. A_a|
 906         // 2. a_A|
 907         //
 908         // Theoretically, there are other situations that we should, perhaps, deal
 909         // with (e.g.: a|_A, A|_a). In practice, though, there really isn't any
 910         // point (to understand why, just try to create this situation...).
 911
 912         if ((cur.pos() >= 2) && (par.isLineSeparator(cur.pos() - 1))) {
 913                 // get font in front and behind the space in question. But do NOT
 914                 // use getFont(cur.pos()) because the character c is not inserted yet
 915                 Font const pre_space_font  = tm.displayFont(cur.pit(), cur.pos() - 2);
 916                 Font const & post_space_font = cur.real_current_font;
 917                 bool pre_space_rtl  = pre_space_font.isVisibleRightToLeft();
 918                 bool post_space_rtl = post_space_font.isVisibleRightToLeft();
 919
 920                 if (pre_space_rtl != post_space_rtl) {
 921                         // Set the space's language to match the language of the
 922                         // adjacent character whose direction is the paragraph's
 923                         // direction; don't touch other properties of the font
 924                         Language const * lang =
 925                                 (pre_space_rtl == par.isRTL(buffer.params())) ?
 926                                 pre_space_font.language() : post_space_font.language();
 927
 928                         Font space_font = tm.displayFont(cur.pit(), cur.pos() - 1);
 929                         space_font.setLanguage(lang);
 930                         par.setFont(cur.pos() - 1, space_font);
 931                 }
 932         }
 933
 934         // Next check, if there will be two blanks together or a blank at
 935         // the beginning of a paragraph.
 936         // I decided to handle blanks like normal characters, the main
 937         // difference are the special checks when calculating the row.fill
 938         // (blank does not count at the end of a row) and the check here
 939
 940         // When the free-spacing option is set for the current layout,
 941         // disable the double-space checking
 942         if (!freeSpacing && isLineSeparatorChar(c)) {
 943                 if (cur.pos() == 0) {
 944                         cur.message(_(
 945                                         "You cannot insert a space at the "
 946                                         "beginning of a paragraph. Please read the Tutorial."));
 947                         return;
 948                 }
 949                 LASSERT(cur.pos() > 0, /**/);
 950                 if ((par.isLineSeparator(cur.pos() - 1) || par.isNewline(cur.pos() - 1))
 951                                 && !par.isDeleted(cur.pos() - 1)) {
 952                         cur.message(_(
 953                                         "You cannot type two spaces this way. "
 954                                         "Please read the Tutorial."));
 955                         return;
 956                 }
 957         }
 958
 959         par.insertChar(cur.pos(), c, cur.current_font,
 960                 cur.buffer()->params().trackChanges);
 961         cur.checkBufferStructure();
 962
 963 //              cur.screenUpdateFlags(Update::Force);
 964         bool boundary = cur.boundary()
 965                 || tm.isRTLBoundary(cur.pit(), cur.pos() + 1);
 966         setCursor(cur, cur.pit(), cur.pos() + 1, false, boundary);
 967         charInserted(cur);
 968 }
 969
 970
 971 void Text::charInserted(Cursor & cur)
 972 {
 973         Paragraph & par = cur.paragraph();
 974
 975         // Here we call finishUndo for every 20 characters inserted.
 976         // This is from my experience how emacs does it. (Lgb)
 977         if (undo_counter_ < 20) {
 978                 ++undo_counter_;
 979         } else {
 980                 cur.finishUndo();
 981                 undo_counter_ = 0;
 982         }
 983
 984         // register word if a non-letter was entered
 985         if (cur.pos() > 1
 986             && !par.isWordSeparator(cur.pos() - 2)
 987             && par.isWordSeparator(cur.pos() - 1)) {
 988                 // get the word in front of cursor
 989                 LASSERT(this == cur.text(), /**/);
 990                 cur.paragraph().updateWords();
 991         }
 992 }
 993
 994
 995 // the cursor set functions have a special mechanism. When they
 996 // realize, that you left an empty paragraph, they will delete it.
 997
 998 bool Text::cursorForwardOneWord(Cursor & cur)
 999 {
1000         LASSERT(this == cur.text(), /**/);
1001
1002         pos_type const lastpos = cur.lastpos();
1003         pit_type pit = cur.pit();
1004         pos_type pos = cur.pos();
1005         Paragraph const & par = cur.paragraph();
1006
1007         // Paragraph boundary is a word boundary
1008         if (pos == lastpos) {
1009                 if (pit != cur.lastpit())
1010                         return setCursor(cur, pit + 1, 0);
1011                 else
1012                         return false;
1013         }
1014
1015         if (lyxrc.mac_like_word_movement) {
1016                 // Skip through trailing punctuation and spaces.
1017                 while (pos != lastpos && (par.isChar(pos) || par.isSpace(pos)))
1018                         ++pos;
1019
1020                 // Skip over either a non-char inset or a full word
1021                 if (pos != lastpos && par.isWordSeparator(pos))
1022                         ++pos;
1023                 else while (pos != lastpos && !par.isWordSeparator(pos))
1024                              ++pos;
1025         } else {
1026                 LASSERT(pos < lastpos, /**/); // see above
1027                 if (!par.isWordSeparator(pos))
1028                         while (pos != lastpos && !par.isWordSeparator(pos))
1029                                 ++pos;
1030                 else if (par.isChar(pos))
1031                         while (pos != lastpos && par.isChar(pos))
1032                                 ++pos;
1033                 else if (!par.isSpace(pos)) // non-char inset
1034                         ++pos;
1035
1036                 // Skip over white space
1037                 while (pos != lastpos && par.isSpace(pos))
1038                              ++pos;
1039         }
1040
1041         return setCursor(cur, pit, pos);
1042 }
1043
1044
1045 bool Text::cursorBackwardOneWord(Cursor & cur)
1046 {
1047         LASSERT(this == cur.text(), /**/);
1048
1049         pit_type pit = cur.pit();
1050         pos_type pos = cur.pos();
1051         Paragraph & par = cur.paragraph();
1052
1053         // Paragraph boundary is a word boundary
1054         if (pos == 0 && pit != 0)
1055                 return setCursor(cur, pit - 1, getPar(pit - 1).size());
1056
1057         if (lyxrc.mac_like_word_movement) {
1058                 // Skip through punctuation and spaces.
1059                 while (pos != 0 && (par.isChar(pos - 1) || par.isSpace(pos - 1)))
1060                         --pos;
1061
1062                 // Skip over either a non-char inset or a full word
1063                 if (pos != 0 && par.isWordSeparator(pos - 1) && !par.isChar(pos - 1))
1064                         --pos;
1065                 else while (pos != 0 && !par.isWordSeparator(pos - 1))
1066                              --pos;
1067         } else {
1068                 // Skip over white space
1069                 while (pos != 0 && par.isSpace(pos - 1))
1070                              --pos;
1071
1072                 if (pos != 0 && !par.isWordSeparator(pos - 1))
1073                         while (pos != 0 && !par.isWordSeparator(pos - 1))
1074                                 --pos;
1075                 else if (pos != 0 && par.isChar(pos - 1))
1076                         while (pos != 0 && par.isChar(pos - 1))
1077                                 --pos;
1078                 else if (pos != 0 && !par.isSpace(pos - 1)) // non-char inset
1079                         --pos;
1080         }
1081
1082         return setCursor(cur, pit, pos);
1083 }
1084
1085
1086 bool Text::cursorVisLeftOneWord(Cursor & cur)
1087 {
1088         LASSERT(this == cur.text(), /**/);
1089
1090         pos_type left_pos, right_pos;
1091         bool left_is_letter, right_is_letter;
1092
1093         Cursor temp_cur = cur;
1094
1095         // always try to move at least once...
1096         while (temp_cur.posVisLeft(true /* skip_inset */)) {
1097
1098                 // collect some information about current cursor position
1099                 temp_cur.getSurroundingPos(left_pos, right_pos);
1100                 left_is_letter =
1101                         (left_pos > -1 ? !temp_cur.paragraph().isWordSeparator(left_pos) : false);
1102                 right_is_letter =
1103                         (right_pos > -1 ? !temp_cur.paragraph().isWordSeparator(right_pos) : false);
1104
1105                 // if we're not at a letter/non-letter boundary, continue moving
1106                 if (left_is_letter == right_is_letter)
1107                         continue;
1108
1109                 // we should stop when we have an LTR word on our right or an RTL word
1110                 // on our left
1111                 if ((left_is_letter && temp_cur.paragraph().getFontSettings(
1112                                 temp_cur.buffer()->params(), left_pos).isRightToLeft())
1113                         || (right_is_letter && !temp_cur.paragraph().getFontSettings(
1114                                 temp_cur.buffer()->params(), right_pos).isRightToLeft()))
1115                         break;
1116         }
1117
1118         return setCursor(cur, temp_cur.pit(), temp_cur.pos(),
1119                                          true, temp_cur.boundary());
1120 }
1121
1122
1123 bool Text::cursorVisRightOneWord(Cursor & cur)
1124 {
1125         LASSERT(this == cur.text(), /**/);
1126
1127         pos_type left_pos, right_pos;
1128         bool left_is_letter, right_is_letter;
1129
1130         Cursor temp_cur = cur;
1131
1132         // always try to move at least once...
1133         while (temp_cur.posVisRight(true /* skip_inset */)) {
1134
1135                 // collect some information about current cursor position
1136                 temp_cur.getSurroundingPos(left_pos, right_pos);
1137                 left_is_letter =
1138                         (left_pos > -1 ? !temp_cur.paragraph().isWordSeparator(left_pos) : false);
1139                 right_is_letter =
1140                         (right_pos > -1 ? !temp_cur.paragraph().isWordSeparator(right_pos) : false);
1141
1142                 // if we're not at a letter/non-letter boundary, continue moving
1143                 if (left_is_letter == right_is_letter)
1144                         continue;
1145
1146                 // we should stop when we have an LTR word on our right or an RTL word
1147                 // on our left
1148                 if ((left_is_letter && temp_cur.paragraph().getFontSettings(
1149                                 temp_cur.buffer()->params(),
1150                                 left_pos).isRightToLeft())
1151                         || (right_is_letter && !temp_cur.paragraph().getFontSettings(
1152                                 temp_cur.buffer()->params(),
1153                                 right_pos).isRightToLeft()))
1154                         break;
1155         }
1156
1157         return setCursor(cur, temp_cur.pit(), temp_cur.pos(),
1158                                          true, temp_cur.boundary());
1159 }
1160
1161
1162 void Text::selectWord(Cursor & cur, word_location loc)
1163 {
1164         LASSERT(this == cur.text(), /**/);
1165         CursorSlice from = cur.top();
1166         CursorSlice to = cur.top();
1167         getWord(from, to, loc);
1168         if (cur.top() != from)
1169                 setCursor(cur, from.pit(), from.pos());
1170         if (to == from)
1171                 return;
1172         if (!cur.selection())
1173                 cur.resetAnchor();
1174         setCursor(cur, to.pit(), to.pos());
1175         cur.setSelection();
1176         cur.setWordSelection(true);
1177 }
1178
1179
1180 void Text::selectAll(Cursor & cur)
1181 {
1182         LASSERT(this == cur.text(), /**/);
1183         if (cur.lastpos() == 0 && cur.lastpit() == 0)
1184                 return;
1185         // If the cursor is at the beginning, make sure the cursor ends there
1186         if (cur.pit() == 0 && cur.pos() == 0) {
1187                 setCursor(cur, cur.lastpit(), getPar(cur.lastpit()).size());
1188                 cur.resetAnchor();
1189                 setCursor(cur, 0, 0);
1190         } else {
1191                 setCursor(cur, 0, 0);
1192                 cur.resetAnchor();
1193                 setCursor(cur, cur.lastpit(), getPar(cur.lastpit()).size());
1194         }
1195         cur.setSelection();
1196 }
1197
1198
1199 // Select the word currently under the cursor when no
1200 // selection is currently set
1201 bool Text::selectWordWhenUnderCursor(Cursor & cur, word_location loc)
1202 {
1203         LASSERT(this == cur.text(), /**/);
1204         if (cur.selection())
1205                 return false;
1206         selectWord(cur, loc);
1207         return cur.selection();
1208 }
1209
1210
1211 void Text::acceptOrRejectChanges(Cursor & cur, ChangeOp op)
1212 {
1213         LASSERT(this == cur.text(), /**/);
1214
1215         if (!cur.selection()) {
1216                 bool const changed = cur.paragraph().isChanged(cur.pos());
1217                 if (!(changed && findNextChange(&cur.bv())))
1218                         return;
1219         }
1220
1221         cur.recordUndoSelection();
1222
1223         pit_type begPit = cur.selectionBegin().pit();
1224         pit_type endPit = cur.selectionEnd().pit();
1225
1226         pos_type begPos = cur.selectionBegin().pos();
1227         pos_type endPos = cur.selectionEnd().pos();
1228
1229         // keep selection info, because endPos becomes invalid after the first loop
1230         bool endsBeforeEndOfPar = (endPos < pars_[endPit].size());
1231
1232         // first, accept/reject changes within each individual paragraph (do not consider end-of-par)
1233
1234         for (pit_type pit = begPit; pit <= endPit; ++pit) {
1235                 pos_type parSize = pars_[pit].size();
1236
1237                 // ignore empty paragraphs; otherwise, an assertion will fail for
1238                 // acceptChanges(bparams, 0, 0) or rejectChanges(bparams, 0, 0)
1239                 if (parSize == 0)
1240                         continue;
1241
1242                 // do not consider first paragraph if the cursor starts at pos size()
1243                 if (pit == begPit && begPos == parSize)
1244                         continue;
1245
1246                 // do not consider last paragraph if the cursor ends at pos 0
1247                 if (pit == endPit && endPos == 0)
1248                         break; // last iteration anyway
1249
1250                 pos_type left  = (pit == begPit ? begPos : 0);
1251                 pos_type right = (pit == endPit ? endPos : parSize);
1252
1253                 if (left == right)
1254                         // there is no change here
1255                         continue;
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
1655         if (!plist.empty()) {
1656                 // see bug 7319
1657                 // we clear the cache so that we won't get conflicts with labels
1658                 // that get pasted into the buffer. we should update this before
1659                 // its being empty matters. if not (i.e., if we encounter bugs),
1660                 // then this should instead be:
1661                 //        cur.buffer().updateBuffer();
1662                 // but we'll try the cheaper solution here.
1663                 cur.buffer()->clearReferenceCache();
1664
1665                 // ERT paragraphs have the Language latex_language.
1666                 // This is invalid outside of ERT, so we need to
1667                 // change it to the buffer language.
1668                 ParagraphList::iterator it = plist.begin();
1669                 ParagraphList::iterator it_end = plist.end();
1670                 for (; it != it_end; it++)
1671                         it->changeLanguage(b.params(), latex_language, b.language());
1672
1673                 pasteParagraphList(cur, plist, b.params().documentClassPtr(),
1674                                    b.errorList("Paste"));
1675                 // restore position
1676                 cur.pit() = min(cur.lastpit(), spit);
1677                 cur.pos() = min(cur.lastpos(), spos);
1678         }
1679
1680         cur.forceBufferUpdate();
1681
1682         // Ensure the current language is set correctly (bug 6292)
1683         cur.text()->setCursor(cur, cur.pit(), cur.pos());
1684         cur.clearSelection();
1685         cur.resetAnchor();
1686         return true;
1687 }
1688
1689
1690 void Text::getWord(CursorSlice & from, CursorSlice & to,
1691         word_location const loc) const
1692 {
1693         to = from;
1694         pars_[to.pit()].locateWord(from.pos(), to.pos(), loc);
1695 }
1696
1697
1698 void Text::write(ostream & os) const
1699 {
1700         Buffer const & buf = owner_->buffer();
1701         ParagraphList::const_iterator pit = paragraphs().begin();
1702         ParagraphList::const_iterator end = paragraphs().end();
1703         depth_type dth = 0;
1704         for (; pit != end; ++pit)
1705                 pit->write(os, buf.params(), dth);
1706
1707         // Close begin_deeper
1708         for(; dth > 0; --dth)
1709                 os << "\n\\end_deeper";
1710 }
1711
1712
1713 bool Text::read(Lexer & lex,
1714                 ErrorList & errorList, InsetText * insetPtr)
1715 {
1716         Buffer const & buf = owner_->buffer();
1717         depth_type depth = 0;
1718         bool res = true;
1719
1720         while (lex.isOK()) {
1721                 lex.nextToken();
1722                 string const token = lex.getString();
1723
1724                 if (token.empty())
1725                         continue;
1726
1727                 if (token == "\\end_inset")
1728                         break;
1729
1730                 if (token == "\\end_body")
1731                         continue;
1732
1733                 if (token == "\\begin_body")
1734                         continue;
1735
1736                 if (token == "\\end_document") {
1737                         res = false;
1738                         break;
1739                 }
1740
1741                 if (token == "\\begin_layout") {
1742                         lex.pushToken(token);
1743
1744                         Paragraph par;
1745                         par.setInsetOwner(insetPtr);
1746                         par.params().depth(depth);
1747                         par.setFont(0, Font(inherit_font, buf.params().language));
1748                         pars_.push_back(par);
1749                         readParagraph(pars_.back(), lex, errorList);
1750
1751                         // register the words in the global word list
1752                         pars_.back().updateWords();
1753                 } else if (token == "\\begin_deeper") {
1754                         ++depth;
1755                 } else if (token == "\\end_deeper") {
1756                         if (!depth)
1757                                 lex.printError("\\end_deeper: " "depth is already null");
1758                         else
1759                                 --depth;
1760                 } else {
1761                         LYXERR0("Handling unknown body token: `" << token << '\'');
1762                 }
1763         }
1764
1765         // avoid a crash on weird documents (bug 4859)
1766         if (pars_.empty()) {
1767                 Paragraph par;
1768                 par.setInsetOwner(insetPtr);
1769                 par.params().depth(depth);
1770                 par.setFont(0, Font(inherit_font,
1771                                     buf.params().language));
1772                 par.setPlainOrDefaultLayout(buf.params().documentClass());
1773                 pars_.push_back(par);
1774         }
1775
1776         return res;
1777 }
1778
1779 // Returns the current font and depth as a message.
1780 docstring Text::currentState(Cursor const & cur) const
1781 {
1782         LASSERT(this == cur.text(), /**/);
1783         Buffer & buf = *cur.buffer();
1784         Paragraph const & par = cur.paragraph();
1785         odocstringstream os;
1786
1787         if (buf.params().trackChanges)
1788                 os << _("[Change Tracking] ");
1789
1790         Change change = par.lookupChange(cur.pos());
1791
1792         if (change.changed()) {
1793                 Author const & a = buf.params().authors().get(change.author);
1794                 os << _("Change: ") << a.name();
1795                 if (!a.email().empty())
1796                         os << " (" << a.email() << ")";
1797                 // FIXME ctime is english, we should translate that
1798                 os << _(" at ") << ctime(&change.changetime);
1799                 os << " : ";
1800         }
1801
1802         // I think we should only show changes from the default
1803         // font. (Asger)
1804         // No, from the document font (MV)
1805         Font font = cur.real_current_font;
1806         font.fontInfo().reduce(buf.params().getFont().fontInfo());
1807
1808         os << bformat(_("Font: %1$s"), font.stateText(&buf.params()));
1809
1810         // The paragraph depth
1811         int depth = cur.paragraph().getDepth();
1812         if (depth > 0)
1813                 os << bformat(_(", Depth: %1$d"), depth);
1814
1815         // The paragraph spacing, but only if different from
1816         // buffer spacing.
1817         Spacing const & spacing = par.params().spacing();
1818         if (!spacing.isDefault()) {
1819                 os << _(", Spacing: ");
1820                 switch (spacing.getSpace()) {
1821                 case Spacing::Single:
1822                         os << _("Single");
1823                         break;
1824                 case Spacing::Onehalf:
1825                         os << _("OneHalf");
1826                         break;
1827                 case Spacing::Double:
1828                         os << _("Double");
1829                         break;
1830                 case Spacing::Other:
1831                         os << _("Other (") << from_ascii(spacing.getValueAsString()) << ')';
1832                         break;
1833                 case Spacing::Default:
1834                         // should never happen, do nothing
1835                         break;
1836                 }
1837         }
1838
1839 #ifdef DEVEL_VERSION
1840         os << _(", Inset: ") << &cur.inset();
1841         os << _(", Paragraph: ") << cur.pit();
1842         os << _(", Id: ") << par.id();
1843         os << _(", Position: ") << cur.pos();
1844         // FIXME: Why is the check for par.size() needed?
1845         // We are called with cur.pos() == par.size() quite often.
1846         if (!par.empty() && cur.pos() < par.size()) {
1847                 // Force output of code point, not character
1848                 size_t const c = par.getChar(cur.pos());
1849                 os << _(", Char: 0x") << hex << c;
1850         }
1851         os << _(", Boundary: ") << cur.boundary();
1852 //      Row & row = cur.textRow();
1853 //      os << bformat(_(", Row b:%1$d e:%2$d"), row.pos(), row.endpos());
1854 #endif
1855         return os.str();
1856 }
1857
1858
1859 docstring Text::getPossibleLabel(Cursor const & cur) const
1860 {
1861         pit_type pit = cur.pit();
1862
1863         Layout const * layout = &(pars_[pit].layout());
1864
1865         docstring text;
1866         docstring par_text = pars_[pit].asString();
1867
1868         // The return string of math matrices might contain linebreaks
1869         par_text = subst(par_text, '\n', '-');
1870         int const numwords = 3;
1871         for (int i = 0; i < numwords; ++i) {
1872                 if (par_text.empty())
1873                         break;
1874                 docstring head;
1875                 par_text = split(par_text, head, ' ');
1876                 // Is it legal to use spaces in labels ?
1877                 if (i > 0)
1878                         text += '-';
1879                 text += head;
1880         }
1881
1882         // Make sure it isn't too long
1883         unsigned int const max_label_length = 32;
1884         if (text.size() > max_label_length)
1885                 text.resize(max_label_length);
1886
1887         // Will contain the label prefix.
1888         docstring name;
1889
1890         // For section, subsection, etc...
1891         if (layout->latextype == LATEX_PARAGRAPH && pit != 0) {
1892                 Layout const * layout2 = &(pars_[pit - 1].layout());
1893                 if (layout2->latextype != LATEX_PARAGRAPH) {
1894                         --pit;
1895                         layout = layout2;
1896                 }
1897         }
1898         if (layout->latextype != LATEX_PARAGRAPH)
1899                 name = layout->refprefix;
1900
1901         // For captions, we just take the caption type
1902         Inset * caption_inset = cur.innerInsetOfType(CAPTION_CODE);
1903         if (caption_inset) {
1904                 string const & ftype = static_cast<InsetCaption *>(caption_inset)->type();
1905                 FloatList const & fl = cur.buffer()->params().documentClass().floats();
1906                 if (fl.typeExist(ftype)) {
1907                         Floating const & flt = fl.getType(ftype);
1908                         name = from_utf8(flt.refPrefix());
1909                 }
1910                 if (name.empty())
1911                         name = from_utf8(ftype.substr(0,3));
1912         }
1913
1914         // If none of the above worked, see if the inset knows.
1915         if (name.empty()) {
1916                 InsetLayout const & il = cur.inset().getLayout();
1917                 name = il.refprefix();
1918         }
1919
1920         if (!name.empty())
1921                 text = name + ':' + text;
1922
1923         return text;
1924 }
1925
1926
1927 docstring Text::asString(int options) const
1928 {
1929         return asString(0, pars_.size(), options);
1930 }
1931
1932
1933 docstring Text::asString(pit_type beg, pit_type end, int options) const
1934 {
1935         size_t i = size_t(beg);
1936         docstring str = pars_[i].asString(options);
1937         for (++i; i != size_t(end); ++i) {
1938                 str += '\n';
1939                 str += pars_[i].asString(options);
1940         }
1941         return str;
1942 }
1943
1944
1945 void Text::forToc(docstring & os, size_t maxlen, bool shorten) const
1946 {
1947         LASSERT(maxlen > 10, maxlen = 30);
1948         for (size_t i = 0; i != pars_.size() && os.length() < maxlen; ++i)
1949                 pars_[i].forToc(os, maxlen);
1950         if (shorten && os.length() >= maxlen)
1951                 os = os.substr(0, maxlen - 3) + from_ascii("...");
1952 }
1953
1954
1955 void Text::charsTranspose(Cursor & cur)
1956 {
1957         LASSERT(this == cur.text(), /**/);
1958
1959         pos_type pos = cur.pos();
1960
1961         // If cursor is at beginning or end of paragraph, do nothing.
1962         if (pos == cur.lastpos() || pos == 0)
1963                 return;
1964
1965         Paragraph & par = cur.paragraph();
1966
1967         // Get the positions of the characters to be transposed.
1968         pos_type pos1 = pos - 1;
1969         pos_type pos2 = pos;
1970
1971         // In change tracking mode, ignore deleted characters.
1972         while (pos2 < cur.lastpos() && par.isDeleted(pos2))
1973                 ++pos2;
1974         if (pos2 == cur.lastpos())
1975                 return;
1976
1977         while (pos1 >= 0 && par.isDeleted(pos1))
1978                 --pos1;
1979         if (pos1 < 0)
1980                 return;
1981
1982         // Don't do anything if one of the "characters" is not regular text.
1983         if (par.isInset(pos1) || par.isInset(pos2))
1984                 return;
1985
1986         // Store the characters to be transposed (including font information).
1987         char_type const char1 = par.getChar(pos1);
1988         Font const font1 =
1989                 par.getFontSettings(cur.buffer()->params(), pos1);
1990
1991         char_type const char2 = par.getChar(pos2);
1992         Font const font2 =
1993                 par.getFontSettings(cur.buffer()->params(), pos2);
1994
1995         // And finally, we are ready to perform the transposition.
1996         // Track the changes if Change Tracking is enabled.
1997         bool const trackChanges = cur.buffer()->params().trackChanges;
1998
1999         cur.recordUndo();
2000
2001         par.eraseChar(pos2, trackChanges);
2002         par.eraseChar(pos1, trackChanges);
2003         par.insertChar(pos1, char2, font2, trackChanges);
2004         par.insertChar(pos2, char1, font1, trackChanges);
2005
2006         cur.checkBufferStructure();
2007
2008         // After the transposition, move cursor to after the transposition.
2009         setCursor(cur, cur.pit(), pos2);
2010         cur.forwardPos();
2011 }
2012
2013
2014 DocIterator Text::macrocontextPosition() const
2015 {
2016         return macrocontext_position_;
2017 }
2018
2019
2020 void Text::setMacrocontextPosition(DocIterator const & pos)
2021 {
2022         macrocontext_position_ = pos;
2023 }
2024
2025
2026 docstring Text::previousWord(CursorSlice const & sl) const
2027 {
2028         CursorSlice from = sl;
2029         CursorSlice to = sl;
2030         getWord(from, to, PREVIOUS_WORD);
2031         if (sl == from || to == from)
2032                 return docstring();
2033
2034         Paragraph const & par = sl.paragraph();
2035         return par.asString(from.pos(), to.pos());
2036 }
2037
2038
2039 bool Text::completionSupported(Cursor const & cur) const
2040 {
2041         Paragraph const & par = cur.paragraph();
2042         return cur.pos() > 0
2043                 && (cur.pos() >= par.size() || par.isWordSeparator(cur.pos()))
2044                 && !par.isWordSeparator(cur.pos() - 1);
2045 }
2046
2047
2048 CompletionList const * Text::createCompletionList(Cursor const & cur) const
2049 {
2050         WordList const * list = theWordList(*cur.getFont().language());
2051         return new TextCompletionList(cur, list);
2052 }
2053
2054
2055 bool Text::insertCompletion(Cursor & cur, docstring const & s, bool /*finished*/)
2056 {
2057         LASSERT(cur.bv().cursor() == cur, /**/);
2058         cur.insert(s);
2059         cur.bv().cursor() = cur;
2060         if (!(cur.result().screenUpdate() & Update::Force))
2061                 cur.screenUpdateFlags(cur.result().screenUpdate() | Update::SinglePar);
2062         return true;
2063 }
2064
2065
2066 docstring Text::completionPrefix(Cursor const & cur) const
2067 {
2068         return previousWord(cur.top());
2069 }
2070
2071 } // namespace lyx