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 "Cursor.h"
  30 #include "ParIterator.h"
  31 #include "CutAndPaste.h"
  32 #include "debug.h"
  33 #include "DispatchResult.h"
  34 #include "Encoding.h"
  35 #include "ErrorList.h"
  36 #include "FuncRequest.h"
  37 #include "factory.h"
  38 #include "FontIterator.h"
  39 #include "gettext.h"
  40 #include "Language.h"
  41 #include "Length.h"
  42 #include "Lexer.h"
  43 #include "LyXRC.h"
  44 #include "Paragraph.h"
  45 #include "paragraph_funcs.h"
  46 #include "ParagraphParameters.h"
  47 #include "TextMetrics.h"
  48 #include "VSpace.h"
  49 #include "WordLangTuple.h"
  50
  51 #include "frontends/FontMetrics.h"
  52 #include "frontends/Painter.h"
  53
  54 #include "insets/InsetText.h"
  55 #include "insets/InsetBibitem.h"
  56 #include "insets/InsetCaption.h"
  57 #include "insets/InsetHFill.h"
  58 #include "insets/InsetLine.h"
  59 #include "insets/InsetNewline.h"
  60 #include "insets/InsetPagebreak.h"
  61 #include "insets/InsetOptArg.h"
  62 #include "insets/InsetSpace.h"
  63 #include "insets/InsetSpecialChar.h"
  64 #include "insets/InsetTabular.h"
  65
  66 #include "support/docstream.h"
  67 #include "support/lstrings.h"
  68 #include "support/textutils.h"
  69 #include "support/convert.h"
  70
  71 #include <boost/current_function.hpp>
  72 #include <boost/next_prior.hpp>
  73
  74 #include <sstream>
  75
  76 using std::auto_ptr;
  77 using std::advance;
  78 using std::distance;
  79 using std::max;
  80 using std::min;
  81 using std::endl;
  82 using std::string;
  83
  84 namespace lyx {
  85
  86 using support::bformat;
  87 using support::contains;
  88 using support::split;
  89
  90 using cap::cutSelection;
  91 using cap::pasteParagraphList;
  92
  93 using frontend::FontMetrics;
  94
  95 namespace {
  96
  97 void readParToken(Buffer const & buf, Paragraph & par, Lexer & lex,
  98         string const & token, Font & font, Change & change, ErrorList & errorList)
  99 {
 100         BufferParams const & bp = buf.params();
 101
 102         if (token[0] != '\\') {
 103                 docstring dstr = lex.getDocString();
 104                 par.appendString(dstr, font, change);
 105
 106         } else if (token == "\\begin_layout") {
 107                 lex.eatLine();
 108                 docstring layoutname = lex.getDocString();
 109
 110                 font = Font(inherit_font, bp.language);
 111                 change = Change(Change::UNCHANGED);
 112
 113                 TextClass const & tclass = bp.getTextClass();
 114
 115                 if (layoutname.empty()) {
 116                         layoutname = tclass.defaultLayoutName();
 117                 }
 118
 119                 bool hasLayout = tclass.hasLayout(layoutname);
 120
 121                 if (!hasLayout) {
 122                         errorList.push_back(ErrorItem(_("Unknown layout"),
 123                         bformat(_("Layout '%1$s' does not exist in textclass '%2$s'\nTrying to use the default instead.\n"),
 124                         layoutname, from_utf8(tclass.name())), par.id(), 0, par.size()));
 125                         layoutname = tclass.defaultLayoutName();
 126                 }
 127
 128                 par.layout(bp.getTextClass()[layoutname]);
 129
 130                 // Test whether the layout is obsolete.
 131                 LayoutPtr const & layout = par.layout();
 132                 if (!layout->obsoleted_by().empty())
 133                         par.layout(bp.getTextClass()[layout->obsoleted_by()]);
 134
 135                 par.params().read(lex);
 136
 137         } else if (token == "\\end_layout") {
 138                 lyxerr << BOOST_CURRENT_FUNCTION
 139                        << ": Solitary \\end_layout in line "
 140                        << lex.getLineNo() << "\n"
 141                        << "Missing \\begin_layout?.\n";
 142         } else if (token == "\\end_inset") {
 143                 lyxerr << BOOST_CURRENT_FUNCTION
 144                        << ": Solitary \\end_inset in line "
 145                        << lex.getLineNo() << "\n"
 146                        << "Missing \\begin_inset?.\n";
 147         } else if (token == "\\begin_inset") {
 148                 Inset * inset = readInset(lex, buf);
 149                 if (inset)
 150                         par.insertInset(par.size(), inset, font, change);
 151                 else {
 152                         lex.eatLine();
 153                         docstring line = lex.getDocString();
 154                         errorList.push_back(ErrorItem(_("Unknown Inset"), line,
 155                                             par.id(), 0, par.size()));
 156                 }
 157         } else if (token == "\\family") {
 158                 lex.next();
 159                 setLyXFamily(lex.getString(), font.fontInfo());
 160         } else if (token == "\\series") {
 161                 lex.next();
 162                 setLyXSeries(lex.getString(), font.fontInfo());
 163         } else if (token == "\\shape") {
 164                 lex.next();
 165                 setLyXShape(lex.getString(), font.fontInfo());
 166         } else if (token == "\\size") {
 167                 lex.next();
 168                 setLyXSize(lex.getString(), font.fontInfo());
 169         } else if (token == "\\lang") {
 170                 lex.next();
 171                 string const tok = lex.getString();
 172                 Language const * lang = languages.getLanguage(tok);
 173                 if (lang) {
 174                         font.setLanguage(lang);
 175                 } else {
 176                         font.setLanguage(bp.language);
 177                         lex.printError("Unknown language `$$Token'");
 178                 }
 179         } else if (token == "\\numeric") {
 180                 lex.next();
 181                 font.fontInfo().setNumber(font.setLyXMisc(lex.getString()));
 182         } else if (token == "\\emph") {
 183                 lex.next();
 184                 font.fontInfo().setEmph(font.setLyXMisc(lex.getString()));
 185         } else if (token == "\\bar") {
 186                 lex.next();
 187                 string const tok = lex.getString();
 188
 189                 if (tok == "under")
 190                         font.fontInfo().setUnderbar(FONT_ON);
 191                 else if (tok == "no")
 192                         font.fontInfo().setUnderbar(FONT_OFF);
 193                 else if (tok == "default")
 194                         font.fontInfo().setUnderbar(FONT_INHERIT);
 195                 else
 196                         lex.printError("Unknown bar font flag "
 197                                        "`$$Token'");
 198         } else if (token == "\\noun") {
 199                 lex.next();
 200                 font.fontInfo().setNoun(font.setLyXMisc(lex.getString()));
 201         } else if (token == "\\color") {
 202                 lex.next();
 203                 setLyXColor(lex.getString(), font.fontInfo());
 204         } else if (token == "\\InsetSpace" || token == "\\SpecialChar") {
 205
 206                 // Insets don't make sense in a free-spacing context! ---Kayvan
 207                 if (par.isFreeSpacing()) {
 208                         if (token == "\\InsetSpace")
 209                                 par.appendChar(' ', font, change);
 210                         else if (lex.isOK()) {
 211                                 lex.next();
 212                                 string const next_token = lex.getString();
 213                                 if (next_token == "\\-")
 214                                         par.appendChar('-', font, change);
 215                                 else {
 216                                         lex.printError("Token `$$Token' "
 217                                                        "is in free space "
 218                                                        "paragraph layout!");
 219                                 }
 220                         }
 221                 } else {
 222                         auto_ptr<Inset> inset;
 223                         if (token == "\\SpecialChar" )
 224                                 inset.reset(new InsetSpecialChar);
 225                         else
 226                                 inset.reset(new InsetSpace);
 227                         inset->read(buf, lex);
 228                         par.insertInset(par.size(), inset.release(),
 229                                         font, change);
 230                 }
 231         } else if (token == "\\backslash") {
 232                 par.appendChar('\\', font, change);
 233         } else if (token == "\\newline") {
 234                 auto_ptr<Inset> inset(new InsetNewline);
 235                 inset->read(buf, lex);
 236                 par.insertInset(par.size(), inset.release(), font, change);
 237         } else if (token == "\\LyXTable") {
 238                 auto_ptr<Inset> inset(new InsetTabular(buf));
 239                 inset->read(buf, lex);
 240                 par.insertInset(par.size(), inset.release(), font, change);
 241         } else if (token == "\\hfill") {
 242                 par.insertInset(par.size(), new InsetHFill, font, change);
 243         } else if (token == "\\lyxline") {
 244                 par.insertInset(par.size(), new InsetLine, font, change);
 245         } else if (token == "\\newpage") {
 246                 par.insertInset(par.size(), new InsetPagebreak, font, change);
 247         } else if (token == "\\clearpage") {
 248                 par.insertInset(par.size(), new InsetClearPage, font, change);
 249         } else if (token == "\\cleardoublepage") {
 250                 par.insertInset(par.size(), new InsetClearDoublePage, font, change);
 251         } else if (token == "\\change_unchanged") {
 252                 change = Change(Change::UNCHANGED);
 253         } else if (token == "\\change_inserted") {
 254                 lex.eatLine();
 255                 std::istringstream is(lex.getString());
 256                 unsigned int aid;
 257                 time_type ct;
 258                 is >> aid >> ct;
 259                 if (aid >= bp.author_map.size()) {
 260                         errorList.push_back(ErrorItem(_("Change tracking error"),
 261                                             bformat(_("Unknown author index for insertion: %1$d\n"), aid),
 262                                             par.id(), 0, par.size()));
 263                         change = Change(Change::UNCHANGED);
 264                 } else
 265                         change = Change(Change::INSERTED, bp.author_map[aid], ct);
 266         } else if (token == "\\change_deleted") {
 267                 lex.eatLine();
 268                 std::istringstream is(lex.getString());
 269                 unsigned int aid;
 270                 time_type ct;
 271                 is >> aid >> ct;
 272                 if (aid >= bp.author_map.size()) {
 273                         errorList.push_back(ErrorItem(_("Change tracking error"),
 274                                             bformat(_("Unknown author index for deletion: %1$d\n"), aid),
 275                                             par.id(), 0, par.size()));
 276                         change = Change(Change::UNCHANGED);
 277                 } else
 278                         change = Change(Change::DELETED, bp.author_map[aid], ct);
 279         } else {
 280                 lex.eatLine();
 281                 errorList.push_back(ErrorItem(_("Unknown token"),
 282                         bformat(_("Unknown token: %1$s %2$s\n"), from_utf8(token),
 283                         lex.getDocString()),
 284                         par.id(), 0, par.size()));
 285         }
 286 }
 287
 288
 289 void readParagraph(Buffer const & buf, Paragraph & par, Lexer & lex,
 290         ErrorList & errorList)
 291 {
 292         lex.nextToken();
 293         string token = lex.getString();
 294         Font font;
 295         Change change(Change::UNCHANGED);
 296
 297         while (lex.isOK()) {
 298                 readParToken(buf, par, lex, token, font, change, errorList);
 299
 300                 lex.nextToken();
 301                 token = lex.getString();
 302
 303                 if (token.empty())
 304                         continue;
 305
 306                 if (token == "\\end_layout") {
 307                         //Ok, paragraph finished
 308                         break;
 309                 }
 310
 311                 LYXERR(Debug::PARSER) << "Handling paragraph token: `"
 312                                       << token << '\'' << endl;
 313                 if (token == "\\begin_layout" || token == "\\end_document"
 314                     || token == "\\end_inset" || token == "\\begin_deeper"
 315                     || token == "\\end_deeper") {
 316                         lex.pushToken(token);
 317                         lyxerr << "Paragraph ended in line "
 318                                << lex.getLineNo() << "\n"
 319                                << "Missing \\end_layout.\n";
 320                         break;
 321                 }
 322         }
 323         // Final change goes to paragraph break:
 324         par.setChange(par.size(), change);
 325
 326         // Initialize begin_of_body_ on load; redoParagraph maintains
 327         par.setBeginOfBody();
 328 }
 329
 330
 331 } // namespace anon
 332
 333
 334 bool Text::empty() const
 335 {
 336         return pars_.empty() || (pars_.size() == 1 && pars_[0].empty()
 337                 // FIXME: Should we consider the labeled type as empty too?
 338                 && pars_[0].layout()->labeltype == LABEL_NO_LABEL);
 339 }
 340
 341
 342 double Text::spacing(Buffer const & buffer,
 343                 Paragraph const & par) const
 344 {
 345         if (par.params().spacing().isDefault())
 346                 return buffer.params().spacing().getValue();
 347         return par.params().spacing().getValue();
 348 }
 349
 350
 351 void Text::breakParagraph(Cursor & cur, bool inverse_logic)
 352 {
 353         BOOST_ASSERT(this == cur.text());
 354
 355         Paragraph & cpar = cur.paragraph();
 356         pit_type cpit = cur.pit();
 357
 358         TextClass const & tclass = cur.buffer().params().getTextClass();
 359         LayoutPtr const & layout = cpar.layout();
 360
 361         // this is only allowed, if the current paragraph is not empty
 362         // or caption and if it has not the keepempty flag active
 363         if (cur.lastpos() == 0 && !cpar.allowEmpty() &&
 364             layout->labeltype != LABEL_SENSITIVE)
 365                 return;
 366
 367         // a layout change may affect also the following paragraph
 368         recUndo(cur, cur.pit(), undoSpan(cur.pit()) - 1);
 369
 370         // Always break behind a space
 371         // It is better to erase the space (Dekel)
 372         if (cur.pos() != cur.lastpos() && cpar.isLineSeparator(cur.pos()))
 373                 cpar.eraseChar(cur.pos(), cur.buffer().params().trackChanges);
 374
 375         // What should the layout for the new paragraph be?
 376         bool keep_layout = inverse_logic ?
 377                 !layout->isEnvironment()
 378                 : layout->isEnvironment();
 379
 380         // We need to remember this before we break the paragraph, because
 381         // that invalidates the layout variable
 382         bool sensitive = layout->labeltype == LABEL_SENSITIVE;
 383
 384         // we need to set this before we insert the paragraph.
 385         bool const isempty = cpar.allowEmpty() && cpar.empty();
 386
 387         lyx::breakParagraph(cur.buffer().params(), paragraphs(), cpit,
 388                          cur.pos(), keep_layout);
 389
 390         // After this, neither paragraph contains any rows!
 391
 392         cpit = cur.pit();
 393         pit_type next_par = cpit + 1;
 394
 395         // well this is the caption hack since one caption is really enough
 396         if (sensitive) {
 397                 if (cur.pos() == 0)
 398                         // set to standard-layout
 399                         pars_[cpit].applyLayout(tclass.defaultLayout());
 400                 else
 401                         // set to standard-layout
 402                         pars_[next_par].applyLayout(tclass.defaultLayout());
 403         }
 404
 405         while (!pars_[next_par].empty() && pars_[next_par].isNewline(0)) {
 406                 if (!pars_[next_par].eraseChar(0, cur.buffer().params().trackChanges))
 407                         break; // the character couldn't be deleted physically due to change tracking
 408         }
 409
 410         updateLabels(cur.buffer());
 411
 412         // A singlePar update is not enough in this case.
 413         cur.updateFlags(Update::Force);
 414
 415         // This check is necessary. Otherwise the new empty paragraph will
 416         // be deleted automatically. And it is more friendly for the user!
 417         if (cur.pos() != 0 || isempty)
 418                 setCursor(cur, cur.pit() + 1, 0);
 419         else
 420                 setCursor(cur, cur.pit(), 0);
 421 }
 422
 423
 424 // insert a character, moves all the following breaks in the
 425 // same Paragraph one to the right and make a rebreak
 426 void Text::insertChar(Cursor & cur, char_type c)
 427 {
 428         BOOST_ASSERT(this == cur.text());
 429
 430         cur.recordUndo(INSERT_UNDO);
 431
 432         TextMetrics const & tm = cur.bv().textMetrics(this);
 433         Buffer const & buffer = cur.buffer();
 434         Paragraph & par = cur.paragraph();
 435         // try to remove this
 436         pit_type const pit = cur.pit();
 437
 438         bool const freeSpacing = par.layout()->free_spacing ||
 439                 par.isFreeSpacing();
 440
 441         if (lyxrc.auto_number) {
 442                 static docstring const number_operators = from_ascii("+-/*");
 443                 static docstring const number_unary_operators = from_ascii("+-");
 444                 static docstring const number_seperators = from_ascii(".,:");
 445
 446                 if (cur.current_font.fontInfo().number() == FONT_ON) {
 447                         if (!isDigit(c) && !contains(number_operators, c) &&
 448                             !(contains(number_seperators, c) &&
 449                               cur.pos() != 0 &&
 450                               cur.pos() != cur.lastpos() &&
 451                               tm.getDisplayFont(pit, cur.pos()).fontInfo().number() == FONT_ON &&
 452                               tm.getDisplayFont(pit, cur.pos() - 1).fontInfo().number() == FONT_ON)
 453                            )
 454                                 number(cur); // Set current_font.number to OFF
 455                 } else if (isDigit(c) &&
 456                            cur.real_current_font.isVisibleRightToLeft()) {
 457                         number(cur); // Set current_font.number to ON
 458
 459                         if (cur.pos() != 0) {
 460                                 char_type const c = par.getChar(cur.pos() - 1);
 461                                 if (contains(number_unary_operators, c) &&
 462                                     (cur.pos() == 1
 463                                      || par.isSeparator(cur.pos() - 2)
 464                                      || par.isNewline(cur.pos() - 2))
 465                                   ) {
 466                                         setCharFont(buffer, pit, cur.pos() - 1, cur.current_font,
 467                                                 tm.font_);
 468                                 } else if (contains(number_seperators, c)
 469                                      && cur.pos() >= 2
 470                                      && tm.getDisplayFont(pit, cur.pos() - 2).fontInfo().number() == FONT_ON) {
 471                                         setCharFont(buffer, pit, cur.pos() - 1, cur.current_font,
 472                                                 tm.font_);
 473                                 }
 474                         }
 475                 }
 476         }
 477
 478         // In Bidi text, we want spaces to be treated in a special way: spaces
 479         // which are between words in different languages should get the
 480         // paragraph's language; otherwise, spaces should keep the language
 481         // they were originally typed in. This is only in effect while typing;
 482         // after the text is already typed in, the user can always go back and
 483         // explicitly set the language of a space as desired. But 99.9% of the
 484         // time, what we're doing here is what the user actually meant.
 485         //
 486         // The following cases are the ones in which the language of the space
 487         // should be changed to match that of the containing paragraph. In the
 488         // depictions, lowercase is LTR, uppercase is RTL, underscore (_)
 489         // represents a space, pipe (|) represents the cursor position (so the
 490         // character before it is the one just typed in). The different cases
 491         // are depicted logically (not visually), from left to right:
 492         //
 493         // 1. A_a|
 494         // 2. a_A|
 495         //
 496         // Theoretically, there are other situations that we should, perhaps, deal
 497         // with (e.g.: a|_A, A|_a). In practice, though, there really isn't any
 498         // point (to understand why, just try to create this situation...).
 499
 500         if ((cur.pos() >= 2) && (par.isLineSeparator(cur.pos() - 1))) {
 501                 // get font in front and behind the space in question. But do NOT
 502                 // use getFont(cur.pos()) because the character c is not inserted yet
 503                 Font const pre_space_font  = tm.getDisplayFont(cur.pit(), cur.pos() - 2);
 504                 Font const & post_space_font = cur.real_current_font;
 505                 bool pre_space_rtl  = pre_space_font.isVisibleRightToLeft();
 506                 bool post_space_rtl = post_space_font.isVisibleRightToLeft();
 507
 508                 if (pre_space_rtl != post_space_rtl) {
 509                         // Set the space's language to match the language of the
 510                         // adjacent character whose direction is the paragraph's
 511                         // direction; don't touch other properties of the font
 512                         Language const * lang =
 513                                 (pre_space_rtl == par.isRTL(buffer.params())) ?
 514                                 pre_space_font.language() : post_space_font.language();
 515
 516                         Font space_font = tm.getDisplayFont(cur.pit(), cur.pos() - 1);
 517                         space_font.setLanguage(lang);
 518                         par.setFont(cur.pos() - 1, space_font);
 519                 }
 520         }
 521
 522         // Next check, if there will be two blanks together or a blank at
 523         // the beginning of a paragraph.
 524         // I decided to handle blanks like normal characters, the main
 525         // difference are the special checks when calculating the row.fill
 526         // (blank does not count at the end of a row) and the check here
 527
 528         // When the free-spacing option is set for the current layout,
 529         // disable the double-space checking
 530         if (!freeSpacing && isLineSeparatorChar(c)) {
 531                 if (cur.pos() == 0) {
 532                         static bool sent_space_message = false;
 533                         if (!sent_space_message) {
 534                                 cur.message(_("You cannot insert a space at the "
 535                                                            "beginning of a paragraph. Please read the Tutorial."));
 536                                 sent_space_message = true;
 537                         }
 538                         return;
 539                 }
 540                 BOOST_ASSERT(cur.pos() > 0);
 541                 if ((par.isLineSeparator(cur.pos() - 1) || par.isNewline(cur.pos() - 1))
 542                     && !par.isDeleted(cur.pos() - 1)) {
 543                         static bool sent_space_message = false;
 544                         if (!sent_space_message) {
 545                                 cur.message(_("You cannot type two spaces this way. "
 546                                                            "Please read the Tutorial."));
 547                                 sent_space_message = true;
 548                         }
 549                         return;
 550                 }
 551         }
 552
 553         par.insertChar(cur.pos(), c, cur.current_font, cur.buffer().params().trackChanges);
 554         checkBufferStructure(cur.buffer(), cur);
 555
 556 //              cur.updateFlags(Update::Force);
 557         setCursor(cur.top(), cur.pit(), cur.pos() + 1);
 558         charInserted(cur);
 559 }
 560
 561
 562 void Text::charInserted(Cursor & cur)
 563 {
 564         // Here we call finishUndo for every 20 characters inserted.
 565         // This is from my experience how emacs does it. (Lgb)
 566         static unsigned int counter;
 567         if (counter < 20) {
 568                 ++counter;
 569         } else {
 570                 cur.finishUndo();
 571                 counter = 0;
 572         }
 573 }
 574
 575
 576 // the cursor set functions have a special mechanism. When they
 577 // realize, that you left an empty paragraph, they will delete it.
 578
 579 bool Text::cursorForwardOneWord(Cursor & cur)
 580 {
 581         BOOST_ASSERT(this == cur.text());
 582
 583         Cursor old = cur;
 584
 585         if (old.pos() == old.lastpos() && old.pit() != old.lastpit()) {
 586                 ++old.pit();
 587                 old.pos() = 0;
 588         } else {
 589                 // Advance through word.
 590                 while (old.pos() != old.lastpos() && old.paragraph().isLetter(old.pos()))
 591                         ++old.pos();
 592                 // Skip through trailing nonword stuff.
 593                 while (old.pos() != old.lastpos() && !old.paragraph().isLetter(old.pos()))
 594                         ++old.pos();
 595         }
 596         return setCursor(cur, old.pit(), old.pos());
 597 }
 598
 599
 600 bool Text::cursorBackwardOneWord(Cursor & cur)
 601 {
 602         BOOST_ASSERT(this == cur.text());
 603
 604         Cursor old = cur;
 605
 606         if (old.pos() == 0 && old.pit() != 0) {
 607                 --old.pit();
 608                 old.pos() = old.lastpos();
 609         } else {
 610                 // Skip through initial nonword stuff.
 611                 while (old.pos() != 0 && !old.paragraph().isLetter(old.pos() - 1))
 612                         --old.pos();
 613                 // Advance through word.
 614                 while (old.pos() != 0 && old.paragraph().isLetter(old.pos() - 1))
 615                         --old.pos();
 616         }
 617         return setCursor(cur, old.pit(), old.pos());
 618 }
 619
 620
 621 void Text::selectWord(Cursor & cur, word_location loc)
 622 {
 623         BOOST_ASSERT(this == cur.text());
 624         CursorSlice from = cur.top();
 625         CursorSlice to = cur.top();
 626         getWord(from, to, loc);
 627         if (cur.top() != from)
 628                 setCursor(cur, from.pit(), from.pos());
 629         if (to == from)
 630                 return;
 631         cur.resetAnchor();
 632         setCursor(cur, to.pit(), to.pos());
 633         cur.setSelection();
 634 }
 635
 636
 637 // Select the word currently under the cursor when no
 638 // selection is currently set
 639 bool Text::selectWordWhenUnderCursor(Cursor & cur, word_location loc)
 640 {
 641         BOOST_ASSERT(this == cur.text());
 642         if (cur.selection())
 643                 return false;
 644         selectWord(cur, loc);
 645         return cur.selection();
 646 }
 647
 648
 649 void Text::acceptOrRejectChanges(Cursor & cur, ChangeOp op)
 650 {
 651         BOOST_ASSERT(this == cur.text());
 652
 653         if (!cur.selection())
 654                 return;
 655
 656         cur.recordUndoSelection();
 657
 658         pit_type begPit = cur.selectionBegin().pit();
 659         pit_type endPit = cur.selectionEnd().pit();
 660
 661         pos_type begPos = cur.selectionBegin().pos();
 662         pos_type endPos = cur.selectionEnd().pos();
 663
 664         // keep selection info, because endPos becomes invalid after the first loop
 665         bool endsBeforeEndOfPar = (endPos < pars_[endPit].size());
 666
 667         // first, accept/reject changes within each individual paragraph (do not consider end-of-par)
 668
 669         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 670                 pos_type parSize = pars_[pit].size();
 671
 672                 // ignore empty paragraphs; otherwise, an assertion will fail for
 673                 // acceptChanges(bparams, 0, 0) or rejectChanges(bparams, 0, 0)
 674                 if (parSize == 0)
 675                         continue;
 676
 677                 // do not consider first paragraph if the cursor starts at pos size()
 678                 if (pit == begPit && begPos == parSize)
 679                         continue;
 680
 681                 // do not consider last paragraph if the cursor ends at pos 0
 682                 if (pit == endPit && endPos == 0)
 683                         break; // last iteration anyway
 684
 685                 pos_type left  = (pit == begPit ? begPos : 0);
 686                 pos_type right = (pit == endPit ? endPos : parSize);
 687
 688                 if (op == ACCEPT) {
 689                         pars_[pit].acceptChanges(cur.buffer().params(), left, right);
 690                 } else {
 691                         pars_[pit].rejectChanges(cur.buffer().params(), left, right);
 692                 }
 693         }
 694
 695         // next, accept/reject imaginary end-of-par characters
 696
 697         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 698                 pos_type pos = pars_[pit].size();
 699
 700                 // skip if the selection ends before the end-of-par
 701                 if (pit == endPit && endsBeforeEndOfPar)
 702                         break; // last iteration anyway
 703
 704                 // skip if this is not the last paragraph of the document
 705                 // note: the user should be able to accept/reject the par break of the last par!
 706                 if (pit == endPit && pit + 1 != int(pars_.size()))
 707                         break; // last iteration anway
 708
 709                 if (op == ACCEPT) {
 710                         if (pars_[pit].isInserted(pos)) {
 711                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 712                         } else if (pars_[pit].isDeleted(pos)) {
 713                                 if (pit + 1 == int(pars_.size())) {
 714                                         // we cannot remove a par break at the end of the last paragraph;
 715                                         // instead, we mark it unchanged
 716                                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 717                                 } else {
 718                                         mergeParagraph(cur.buffer().params(), pars_, pit);
 719                                         --endPit;
 720                                         --pit;
 721                                 }
 722                         }
 723                 } else {
 724                         if (pars_[pit].isDeleted(pos)) {
 725                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 726                         } else if (pars_[pit].isInserted(pos)) {
 727                                 if (pit + 1 == int(pars_.size())) {
 728                                         // we mark the par break at the end of the last paragraph unchanged
 729                                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 730                                 } else {
 731                                         mergeParagraph(cur.buffer().params(), pars_, pit);
 732                                         --endPit;
 733                                         --pit;
 734                                 }
 735                         }
 736                 }
 737         }
 738
 739         // finally, invoke the DEPM
 740
 741         deleteEmptyParagraphMechanism(begPit, endPit, cur.buffer().params().trackChanges);
 742
 743         //
 744
 745         cur.finishUndo();
 746         cur.clearSelection();
 747         setCursorIntern(cur, begPit, begPos);
 748         cur.updateFlags(Update::Force);
 749         updateLabels(cur.buffer());
 750 }
 751
 752
 753 void Text::acceptChanges(BufferParams const & bparams)
 754 {
 755         lyx::acceptChanges(pars_, bparams);
 756         deleteEmptyParagraphMechanism(0, pars_.size() - 1, bparams.trackChanges);
 757 }
 758
 759
 760 void Text::rejectChanges(BufferParams const & bparams)
 761 {
 762         pit_type pars_size = static_cast<pit_type>(pars_.size());
 763
 764         // first, reject changes within each individual paragraph
 765         // (do not consider end-of-par)
 766         for (pit_type pit = 0; pit < pars_size; ++pit) {
 767                 if (!pars_[pit].empty())   // prevent assertion failure
 768                         pars_[pit].rejectChanges(bparams, 0, pars_[pit].size());
 769         }
 770
 771         // next, reject imaginary end-of-par characters
 772         for (pit_type pit = 0; pit < pars_size; ++pit) {
 773                 pos_type pos = pars_[pit].size();
 774
 775                 if (pars_[pit].isDeleted(pos)) {
 776                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 777                 } else if (pars_[pit].isInserted(pos)) {
 778                         if (pit == pars_size - 1) {
 779                                 // we mark the par break at the end of the last
 780                                 // paragraph unchanged
 781                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 782                         } else {
 783                                 mergeParagraph(bparams, pars_, pit);
 784                                 --pit;
 785                                 --pars_size;
 786                         }
 787                 }
 788         }
 789
 790         // finally, invoke the DEPM
 791         deleteEmptyParagraphMechanism(0, pars_size - 1, bparams.trackChanges);
 792 }
 793
 794
 795 void Text::deleteWordForward(Cursor & cur)
 796 {
 797         BOOST_ASSERT(this == cur.text());
 798         if (cur.lastpos() == 0)
 799                 cursorForward(cur);
 800         else {
 801                 cur.resetAnchor();
 802                 cur.selection() = true;
 803                 cursorForwardOneWord(cur);
 804                 cur.setSelection();
 805                 cutSelection(cur, true, false);
 806                 checkBufferStructure(cur.buffer(), cur);
 807         }
 808 }
 809
 810
 811 void Text::deleteWordBackward(Cursor & cur)
 812 {
 813         BOOST_ASSERT(this == cur.text());
 814         if (cur.lastpos() == 0)
 815                 cursorBackward(cur);
 816         else {
 817                 cur.resetAnchor();
 818                 cur.selection() = true;
 819                 cursorBackwardOneWord(cur);
 820                 cur.setSelection();
 821                 cutSelection(cur, true, false);
 822                 checkBufferStructure(cur.buffer(), cur);
 823         }
 824 }
 825
 826
 827 // Kill to end of line.
 828 void Text::changeCase(Cursor & cur, TextCase action)
 829 {
 830         BOOST_ASSERT(this == cur.text());
 831         CursorSlice from;
 832         CursorSlice to;
 833
 834         if (cur.selection()) {
 835                 from = cur.selBegin();
 836                 to = cur.selEnd();
 837         } else {
 838                 from = cur.top();
 839                 getWord(from, to, PARTIAL_WORD);
 840                 cursorForwardOneWord(cur);
 841         }
 842
 843         cur.recordUndoSelection();
 844
 845         pit_type begPit = from.pit();
 846         pit_type endPit = to.pit();
 847
 848         pos_type begPos = from.pos();
 849         pos_type endPos = to.pos();
 850
 851         pos_type right = 0; // needed after the for loop
 852
 853         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 854                 Paragraph & par = pars_[pit];
 855                 pos_type const pos = (pit == begPit ? begPos : 0);
 856                 right = (pit == endPit ? endPos : par.size());
 857                 par.changeCase(cur.buffer().params(), pos, right, action);
 858         }
 859
 860         // the selection may have changed due to logically-only deleted chars
 861         setCursor(cur, begPit, begPos);
 862         cur.resetAnchor();
 863         setCursor(cur, endPit, right);
 864         cur.setSelection();
 865
 866         checkBufferStructure(cur.buffer(), cur);
 867 }
 868
 869
 870 bool Text::handleBibitems(Cursor & cur)
 871 {
 872         if (cur.paragraph().layout()->labeltype != LABEL_BIBLIO)
 873                 return false;
 874         // if a bibitem is deleted, merge with previous paragraph
 875         // if this is a bibliography item as well
 876         if (cur.pos() == 0) {
 877                 BufferParams const & bufparams = cur.buffer().params();
 878                 Paragraph const & par = cur.paragraph();
 879                 Cursor prevcur = cur;
 880                 if (cur.pit() > 0) {
 881                         --prevcur.pit();
 882                         prevcur.pos() = prevcur.lastpos();
 883                 }
 884                 Paragraph const & prevpar = prevcur.paragraph();
 885                 if (cur.pit() > 0 && par.layout() == prevpar.layout()) {
 886                         cur.recordUndo(ATOMIC_UNDO, prevcur.pit());
 887                         mergeParagraph(bufparams, cur.text()->paragraphs(),
 888                                        prevcur.pit());
 889                         updateLabels(cur.buffer());
 890                         setCursorIntern(cur, prevcur.pit(), prevcur.pos());
 891                         cur.updateFlags(Update::Force);
 892                 // if not, reset the paragraph to default
 893                 } else
 894                         cur.paragraph().layout(
 895                                 bufparams.getTextClass().defaultLayout());
 896                 return true;
 897         }
 898         return false;
 899 }
 900
 901
 902 bool Text::erase(Cursor & cur)
 903 {
 904         BOOST_ASSERT(this == cur.text());
 905         bool needsUpdate = false;
 906         Paragraph & par = cur.paragraph();
 907
 908         if (cur.pos() != cur.lastpos()) {
 909                 // this is the code for a normal delete, not pasting
 910                 // any paragraphs
 911                 cur.recordUndo(DELETE_UNDO);
 912                 if(!par.eraseChar(cur.pos(), cur.buffer().params().trackChanges)) {
 913                         // the character has been logically deleted only => skip it
 914                         cur.top().forwardPos();
 915                 }
 916                 checkBufferStructure(cur.buffer(), cur);
 917                 needsUpdate = true;
 918         } else {
 919                 if (cur.pit() == cur.lastpit())
 920                         return dissolveInset(cur);
 921
 922                 if (!par.isMergedOnEndOfParDeletion(cur.buffer().params().trackChanges)) {
 923                         par.setChange(cur.pos(), Change(Change::DELETED));
 924                         cur.forwardPos();
 925                         needsUpdate = true;
 926                 } else {
 927                         setCursorIntern(cur, cur.pit() + 1, 0);
 928                         needsUpdate = backspacePos0(cur);
 929                 }
 930         }
 931
 932         needsUpdate |= handleBibitems(cur);
 933
 934         if (needsUpdate) {
 935                 // Make sure the cursor is correct. Is this really needed?
 936                 // No, not really... at least not here!
 937                 cur.text()->setCursor(cur.top(), cur.pit(), cur.pos());
 938                 checkBufferStructure(cur.buffer(), cur);
 939         }
 940
 941         return needsUpdate;
 942 }
 943
 944
 945 bool Text::backspacePos0(Cursor & cur)
 946 {
 947         BOOST_ASSERT(this == cur.text());
 948         if (cur.pit() == 0)
 949                 return false;
 950
 951         bool needsUpdate = false;
 952
 953         BufferParams const & bufparams = cur.buffer().params();
 954         TextClass const & tclass = bufparams.getTextClass();
 955         ParagraphList & plist = cur.text()->paragraphs();
 956         Paragraph const & par = cur.paragraph();
 957         Cursor prevcur = cur;
 958         --prevcur.pit();
 959         prevcur.pos() = prevcur.lastpos();
 960         Paragraph const & prevpar = prevcur.paragraph();
 961
 962         // is it an empty paragraph?
 963         if (cur.lastpos() == 0
 964             || (cur.lastpos() == 1 && par.isSeparator(0))) {
 965                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit(), cur.pit());
 966                 plist.erase(boost::next(plist.begin(), cur.pit()));
 967                 needsUpdate = true;
 968         }
 969         // is previous par empty?
 970         else if (prevcur.lastpos() == 0
 971                  || (prevcur.lastpos() == 1 && prevpar.isSeparator(0))) {
 972                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit(), cur.pit());
 973                 plist.erase(boost::next(plist.begin(), prevcur.pit()));
 974                 needsUpdate = true;
 975         }
 976         // Pasting is not allowed, if the paragraphs have different
 977         // layouts. I think it is a real bug of all other
 978         // word processors to allow it. It confuses the user.
 979         // Correction: Pasting is always allowed with standard-layout
 980         else if (par.layout() == prevpar.layout()
 981                  || par.layout() == tclass.defaultLayout()) {
 982                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit());
 983                 mergeParagraph(bufparams, plist, prevcur.pit());
 984                 needsUpdate = true;
 985         }
 986
 987         if (needsUpdate) {
 988                 updateLabels(cur.buffer());
 989                 setCursorIntern(cur, prevcur.pit(), prevcur.pos());
 990         }
 991
 992         return needsUpdate;
 993 }
 994
 995
 996 bool Text::backspace(Cursor & cur)
 997 {
 998         BOOST_ASSERT(this == cur.text());
 999         bool needsUpdate = false;
1000         if (cur.pos() == 0) {
1001                 if (cur.pit() == 0)
1002                         return dissolveInset(cur);
1003
1004                 Paragraph & prev_par = pars_[cur.pit() - 1];
1005
1006                 if (!prev_par.isMergedOnEndOfParDeletion(cur.buffer().params().trackChanges)) {
1007                         prev_par.setChange(prev_par.size(), Change(Change::DELETED));
1008                         setCursorIntern(cur, cur.pit() - 1, prev_par.size());
1009                         return true;
1010                 }
1011                 // The cursor is at the beginning of a paragraph, so
1012                 // the backspace will collapse two paragraphs into one.
1013                 needsUpdate = backspacePos0(cur);
1014
1015         } else {
1016                 // this is the code for a normal backspace, not pasting
1017                 // any paragraphs
1018                 cur.recordUndo(DELETE_UNDO);
1019                 // We used to do cursorBackwardIntern() here, but it is
1020                 // not a good idea since it triggers the auto-delete
1021                 // mechanism. So we do a cursorBackwardIntern()-lite,
1022                 // without the dreaded mechanism. (JMarc)
1023                 setCursorIntern(cur, cur.pit(), cur.pos() - 1,
1024                                 false, cur.boundary());
1025                 cur.paragraph().eraseChar(cur.pos(), cur.buffer().params().trackChanges);
1026                 checkBufferStructure(cur.buffer(), cur);
1027         }
1028
1029         if (cur.pos() == cur.lastpos())
1030                 cur.setCurrentFont();
1031
1032         needsUpdate |= handleBibitems(cur);
1033
1034         // A singlePar update is not enough in this case.
1035 //              cur.updateFlags(Update::Force);
1036         setCursor(cur.top(), cur.pit(), cur.pos());
1037
1038         return needsUpdate;
1039 }
1040
1041
1042 bool Text::dissolveInset(Cursor & cur) {
1043         BOOST_ASSERT(this == cur.text());
1044
1045         if (isMainText(cur.bv().buffer()) || cur.inset().nargs() != 1)
1046                 return false;
1047
1048         cur.recordUndoInset();
1049         cur.selHandle(false);
1050         // save position
1051         pos_type spos = cur.pos();
1052         pit_type spit = cur.pit();
1053         ParagraphList plist;
1054         if (cur.lastpit() != 0 || cur.lastpos() != 0)
1055                 plist = paragraphs();
1056         cur.popLeft();
1057         // store cursor offset
1058         if (spit == 0)
1059                 spos += cur.pos();
1060         spit += cur.pit();
1061         Buffer & b = cur.buffer();
1062         cur.paragraph().eraseChar(cur.pos(), b.params().trackChanges);
1063         if (!plist.empty()) {
1064                 // ERT paragraphs have the Language latex_language.
1065                 // This is invalid outside of ERT, so we need to
1066                 // change it to the buffer language.
1067                 ParagraphList::iterator it = plist.begin();
1068                 ParagraphList::iterator it_end = plist.end();
1069                 for (; it != it_end; it++)
1070                         it->changeLanguage(b.params(), latex_language, b.language());
1071
1072                 pasteParagraphList(cur, plist, b.params().getTextClassPtr(),
1073                                    b.errorList("Paste"));
1074                 // restore position
1075                 cur.pit() = std::min(cur.lastpit(), spit);
1076                 cur.pos() = std::min(cur.lastpos(), spos);
1077         }
1078         cur.clearSelection();
1079         cur.resetAnchor();
1080         return true;
1081 }
1082
1083
1084 void Text::getWord(CursorSlice & from, CursorSlice & to,
1085         word_location const loc)
1086 {
1087         Paragraph const & from_par = pars_[from.pit()];
1088         switch (loc) {
1089         case WHOLE_WORD_STRICT:
1090                 if (from.pos() == 0 || from.pos() == from_par.size()
1091                     || !from_par.isLetter(from.pos())
1092                     || !from_par.isLetter(from.pos() - 1)) {
1093                         to = from;
1094                         return;
1095                 }
1096                 // no break here, we go to the next
1097
1098         case WHOLE_WORD:
1099                 // If we are already at the beginning of a word, do nothing
1100                 if (!from.pos() || !from_par.isLetter(from.pos() - 1))
1101                         break;
1102                 // no break here, we go to the next
1103
1104         case PREVIOUS_WORD:
1105                 // always move the cursor to the beginning of previous word
1106                 while (from.pos() && from_par.isLetter(from.pos() - 1))
1107                         --from.pos();
1108                 break;
1109         case NEXT_WORD:
1110                 lyxerr << "Text::getWord: NEXT_WORD not implemented yet"
1111                        << endl;
1112                 break;
1113         case PARTIAL_WORD:
1114                 // no need to move the 'from' cursor
1115                 break;
1116         }
1117         to = from;
1118         Paragraph & to_par = pars_[to.pit()];
1119         while (to.pos() < to_par.size() && to_par.isLetter(to.pos()))
1120                 ++to.pos();
1121 }
1122
1123
1124 void Text::write(Buffer const & buf, std::ostream & os) const
1125 {
1126         ParagraphList::const_iterator pit = paragraphs().begin();
1127         ParagraphList::const_iterator end = paragraphs().end();
1128         depth_type dth = 0;
1129         for (; pit != end; ++pit)
1130                 pit->write(buf, os, buf.params(), dth);
1131
1132         // Close begin_deeper
1133         for(; dth > 0; --dth)
1134                 os << "\n\\end_deeper";
1135 }
1136
1137
1138 bool Text::read(Buffer const & buf, Lexer & lex, ErrorList & errorList)
1139 {
1140         depth_type depth = 0;
1141
1142         while (lex.isOK()) {
1143                 lex.nextToken();
1144                 string const token = lex.getString();
1145
1146                 if (token.empty())
1147                         continue;
1148
1149                 if (token == "\\end_inset")
1150                         break;
1151
1152                 if (token == "\\end_body")
1153                         continue;
1154
1155                 if (token == "\\begin_body")
1156                         continue;
1157
1158                 if (token == "\\end_document")
1159                         return false;
1160
1161                 if (token == "\\begin_layout") {
1162                         lex.pushToken(token);
1163
1164                         Paragraph par;
1165                         par.params().depth(depth);
1166                         par.setFont(0, Font(inherit_font, buf.params().language));
1167                         pars_.push_back(par);
1168
1169                         // FIXME: goddamn InsetTabular makes us pass a Buffer
1170                         // not BufferParams
1171                         lyx::readParagraph(buf, pars_.back(), lex, errorList);
1172
1173                 } else if (token == "\\begin_deeper") {
1174                         ++depth;
1175                 } else if (token == "\\end_deeper") {
1176                         if (!depth) {
1177                                 lex.printError("\\end_deeper: " "depth is already null");
1178                         } else {
1179                                 --depth;
1180                         }
1181                 } else {
1182                         lyxerr << "Handling unknown body token: `"
1183                                << token << '\'' << endl;
1184                 }
1185         }
1186         return true;
1187 }
1188
1189 // Returns the current font and depth as a message.
1190 docstring Text::currentState(Cursor & cur)
1191 {
1192         BOOST_ASSERT(this == cur.text());
1193         Buffer & buf = cur.buffer();
1194         Paragraph const & par = cur.paragraph();
1195         odocstringstream os;
1196
1197         if (buf.params().trackChanges)
1198                 os << _("[Change Tracking] ");
1199
1200         Change change = par.lookupChange(cur.pos());
1201
1202         if (change.type != Change::UNCHANGED) {
1203                 Author const & a = buf.params().authors().get(change.author);
1204                 os << _("Change: ") << a.name();
1205                 if (!a.email().empty())
1206                         os << " (" << a.email() << ")";
1207                 // FIXME ctime is english, we should translate that
1208                 os << _(" at ") << ctime(&change.changetime);
1209                 os << " : ";
1210         }
1211
1212         // I think we should only show changes from the default
1213         // font. (Asger)
1214         // No, from the document font (MV)
1215         Font font = cur.real_current_font;
1216         font.fontInfo().reduce(buf.params().getFont().fontInfo());
1217
1218         os << bformat(_("Font: %1$s"), font.stateText(&buf.params()));
1219
1220         // The paragraph depth
1221         int depth = cur.paragraph().getDepth();
1222         if (depth > 0)
1223                 os << bformat(_(", Depth: %1$d"), depth);
1224
1225         // The paragraph spacing, but only if different from
1226         // buffer spacing.
1227         Spacing const & spacing = par.params().spacing();
1228         if (!spacing.isDefault()) {
1229                 os << _(", Spacing: ");
1230                 switch (spacing.getSpace()) {
1231                 case Spacing::Single:
1232                         os << _("Single");
1233                         break;
1234                 case Spacing::Onehalf:
1235                         os << _("OneHalf");
1236                         break;
1237                 case Spacing::Double:
1238                         os << _("Double");
1239                         break;
1240                 case Spacing::Other:
1241                         os << _("Other (") << from_ascii(spacing.getValueAsString()) << ')';
1242                         break;
1243                 case Spacing::Default:
1244                         // should never happen, do nothing
1245                         break;
1246                 }
1247         }
1248
1249 #ifdef DEVEL_VERSION
1250         os << _(", Inset: ") << &cur.inset();
1251         os << _(", Paragraph: ") << cur.pit();
1252         os << _(", Id: ") << par.id();
1253         os << _(", Position: ") << cur.pos();
1254         // FIXME: Why is the check for par.size() needed?
1255         // We are called with cur.pos() == par.size() quite often.
1256         if (!par.empty() && cur.pos() < par.size()) {
1257                 // Force output of code point, not character
1258                 size_t const c = par.getChar(cur.pos());
1259                 os << _(", Char: 0x") << std::hex << c;
1260         }
1261         os << _(", Boundary: ") << cur.boundary();
1262 //      Row & row = cur.textRow();
1263 //      os << bformat(_(", Row b:%1$d e:%2$d"), row.pos(), row.endpos());
1264 #endif
1265         return os.str();
1266 }
1267
1268
1269 docstring Text::getPossibleLabel(Cursor & cur) const
1270 {
1271         pit_type pit = cur.pit();
1272
1273         LayoutPtr layout = pars_[pit].layout();
1274
1275         docstring text;
1276         docstring par_text = pars_[pit].asString(cur.buffer(), false);
1277         for (int i = 0; i < lyxrc.label_init_length; ++i) {
1278                 if (par_text.empty())
1279                         break;
1280                 docstring head;
1281                 par_text = split(par_text, head, ' ');
1282                 // Is it legal to use spaces in labels ?
1283                 if (i > 0)
1284                         text += '-';
1285                 text += head;
1286         }
1287
1288         // No need for a prefix if the user said so.
1289         if (lyxrc.label_init_length <= 0)
1290                 return text;
1291
1292         // Will contain the label type.
1293         docstring name;
1294
1295         // For section, subsection, etc...
1296         if (layout->latextype == LATEX_PARAGRAPH && pit != 0) {
1297                 LayoutPtr const & layout2 = pars_[pit - 1].layout();
1298                 if (layout2->latextype != LATEX_PARAGRAPH) {
1299                         --pit;
1300                         layout = layout2;
1301                 }
1302         }
1303         if (layout->latextype != LATEX_PARAGRAPH)
1304                 name = from_ascii(layout->latexname());
1305
1306         // for captions, we just take the caption type
1307         Inset * caption_inset = cur.innerInsetOfType(CAPTION_CODE);
1308         if (caption_inset)
1309                 name = from_ascii(static_cast<InsetCaption *>(caption_inset)->type());
1310
1311         // If none of the above worked, we'll see if we're inside various
1312         // types of insets and take our abbreviation from them.
1313         if (name.empty()) {
1314                 InsetCode const codes[] = {
1315                         FLOAT_CODE,
1316                         WRAP_CODE,
1317                         FOOT_CODE
1318                 };
1319                 for (unsigned int i = 0; i < (sizeof codes / sizeof codes[0]); ++i) {
1320                         Inset * float_inset = cur.innerInsetOfType(codes[i]);
1321                         if (float_inset) {
1322                                 name = float_inset->name();
1323                                 break;
1324                         }
1325                 }
1326         }
1327
1328         // Create a correct prefix for prettyref
1329         if (name == "theorem")
1330                 name = from_ascii("thm");
1331         else if (name == "Foot")
1332                 name = from_ascii("fn");
1333         else if (name == "listing")
1334                 name = from_ascii("lst");
1335
1336         if (!name.empty())
1337                 text = name.substr(0, 3) + ':' + text;
1338
1339         return text;
1340 }
1341
1342
1343 void Text::charsTranspose(Cursor & cur)
1344 {
1345         BOOST_ASSERT(this == cur.text());
1346
1347         pos_type pos = cur.pos();
1348
1349         // If cursor is at beginning or end of paragraph, do nothing.
1350         if (pos == cur.lastpos() || pos == 0)
1351                 return;
1352
1353         Paragraph & par = cur.paragraph();
1354
1355         // Get the positions of the characters to be transposed.
1356         pos_type pos1 = pos - 1;
1357         pos_type pos2 = pos;
1358
1359         // In change tracking mode, ignore deleted characters.
1360         while (pos2 < cur.lastpos() && par.isDeleted(pos2))
1361                 ++pos2;
1362         if (pos2 == cur.lastpos())
1363                 return;
1364
1365         while (pos1 >= 0 && par.isDeleted(pos1))
1366                 --pos1;
1367         if (pos1 < 0)
1368                 return;
1369
1370         // Don't do anything if one of the "characters" is not regular text.
1371         if (par.isInset(pos1) || par.isInset(pos2))
1372                 return;
1373
1374         // Store the characters to be transposed (including font information).
1375         char_type char1 = par.getChar(pos1);
1376         Font const font1 =
1377                 par.getFontSettings(cur.buffer().params(), pos1);
1378
1379         char_type char2 = par.getChar(pos2);
1380         Font const font2 =
1381                 par.getFontSettings(cur.buffer().params(), pos2);
1382
1383         // And finally, we are ready to perform the transposition.
1384         // Track the changes if Change Tracking is enabled.
1385         bool const trackChanges = cur.buffer().params().trackChanges;
1386
1387         cur.recordUndo();
1388
1389         par.eraseChar(pos2, trackChanges);
1390         par.eraseChar(pos1, trackChanges);
1391         par.insertChar(pos1, char2, font2, trackChanges);
1392         par.insertChar(pos2, char1, font1, trackChanges);
1393
1394         checkBufferStructure(cur.buffer(), cur);
1395
1396         // After the transposition, move cursor to after the transposition.
1397         setCursor(cur, cur.pit(), pos2);
1398         cur.forwardPos();
1399 }
1400
1401
1402 } // namespace lyx