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 "support/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 "support/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 "TextClass.h"
  48 #include "TextMetrics.h"
  49 #include "VSpace.h"
  50 #include "WordLangTuple.h"
  51
  52 #include "frontends/FontMetrics.h"
  53 #include "frontends/Painter.h"
  54
  55 #include "insets/InsetText.h"
  56 #include "insets/InsetBibitem.h"
  57 #include "insets/InsetCaption.h"
  58 #include "insets/InsetHFill.h"
  59 #include "insets/InsetLine.h"
  60 #include "insets/InsetNewline.h"
  61 #include "insets/InsetNewpage.h"
  62 #include "insets/InsetOptArg.h"
  63 #include "insets/InsetSpace.h"
  64 #include "insets/InsetSpecialChar.h"
  65 #include "insets/InsetTabular.h"
  66
  67 #include "support/docstream.h"
  68 #include "support/lstrings.h"
  69 #include "support/textutils.h"
  70 #include "support/convert.h"
  71
  72 #include <boost/current_function.hpp>
  73 #include <boost/next_prior.hpp>
  74
  75 #include <sstream>
  76
  77 using std::auto_ptr;
  78 using std::advance;
  79 using std::distance;
  80 using std::max;
  81 using std::min;
  82 using std::endl;
  83 using std::string;
  84
  85 namespace lyx {
  86
  87 using support::bformat;
  88 using support::contains;
  89 using support::split;
  90 using support::subst;
  91
  92 using cap::cutSelection;
  93 using cap::pasteParagraphList;
  94
  95 using frontend::FontMetrics;
  96
  97 namespace {
  98
  99 void readParToken(Buffer const & buf, Paragraph & par, Lexer & lex,
 100         string const & token, Font & font, Change & change, ErrorList & errorList)
 101 {
 102         BufferParams const & bp = buf.params();
 103
 104         if (token[0] != '\\') {
 105                 docstring dstr = lex.getDocString();
 106                 par.appendString(dstr, font, change);
 107
 108         } else if (token == "\\begin_layout") {
 109                 lex.eatLine();
 110                 docstring layoutname = lex.getDocString();
 111
 112                 font = Font(inherit_font, bp.language);
 113                 change = Change(Change::UNCHANGED);
 114
 115                 TextClass const & tclass = bp.getTextClass();
 116
 117                 if (layoutname.empty()) {
 118                         layoutname = tclass.defaultLayoutName();
 119                 }
 120
 121                 bool hasLayout = tclass.hasLayout(layoutname);
 122
 123                 if (!hasLayout) {
 124                         errorList.push_back(ErrorItem(_("Unknown layout"),
 125                         bformat(_("Layout '%1$s' does not exist in textclass '%2$s'\nTrying to use the default instead.\n"),
 126                         layoutname, from_utf8(tclass.name())), par.id(), 0, par.size()));
 127                         layoutname = tclass.defaultLayoutName();
 128                 }
 129
 130                 par.layout(bp.getTextClass()[layoutname]);
 131
 132                 // Test whether the layout is obsolete.
 133                 LayoutPtr const & layout = par.layout();
 134                 if (!layout->obsoleted_by().empty())
 135                         par.layout(bp.getTextClass()[layout->obsoleted_by()]);
 136
 137                 par.params().read(lex);
 138
 139         } else if (token == "\\end_layout") {
 140                 lyxerr << BOOST_CURRENT_FUNCTION
 141                        << ": Solitary \\end_layout in line "
 142                        << lex.getLineNo() << "\n"
 143                        << "Missing \\begin_layout?.\n";
 144         } else if (token == "\\end_inset") {
 145                 lyxerr << BOOST_CURRENT_FUNCTION
 146                        << ": Solitary \\end_inset in line "
 147                        << lex.getLineNo() << "\n"
 148                        << "Missing \\begin_inset?.\n";
 149         } else if (token == "\\begin_inset") {
 150                 Inset * inset = readInset(lex, buf);
 151                 if (inset)
 152                         par.insertInset(par.size(), inset, font, change);
 153                 else {
 154                         lex.eatLine();
 155                         docstring line = lex.getDocString();
 156                         errorList.push_back(ErrorItem(_("Unknown Inset"), line,
 157                                             par.id(), 0, par.size()));
 158                 }
 159         } else if (token == "\\family") {
 160                 lex.next();
 161                 setLyXFamily(lex.getString(), font.fontInfo());
 162         } else if (token == "\\series") {
 163                 lex.next();
 164                 setLyXSeries(lex.getString(), font.fontInfo());
 165         } else if (token == "\\shape") {
 166                 lex.next();
 167                 setLyXShape(lex.getString(), font.fontInfo());
 168         } else if (token == "\\size") {
 169                 lex.next();
 170                 setLyXSize(lex.getString(), font.fontInfo());
 171         } else if (token == "\\lang") {
 172                 lex.next();
 173                 string const tok = lex.getString();
 174                 Language const * lang = languages.getLanguage(tok);
 175                 if (lang) {
 176                         font.setLanguage(lang);
 177                 } else {
 178                         font.setLanguage(bp.language);
 179                         lex.printError("Unknown language `$$Token'");
 180                 }
 181         } else if (token == "\\numeric") {
 182                 lex.next();
 183                 font.fontInfo().setNumber(font.setLyXMisc(lex.getString()));
 184         } else if (token == "\\emph") {
 185                 lex.next();
 186                 font.fontInfo().setEmph(font.setLyXMisc(lex.getString()));
 187         } else if (token == "\\bar") {
 188                 lex.next();
 189                 string const tok = lex.getString();
 190
 191                 if (tok == "under")
 192                         font.fontInfo().setUnderbar(FONT_ON);
 193                 else if (tok == "no")
 194                         font.fontInfo().setUnderbar(FONT_OFF);
 195                 else if (tok == "default")
 196                         font.fontInfo().setUnderbar(FONT_INHERIT);
 197                 else
 198                         lex.printError("Unknown bar font flag "
 199                                        "`$$Token'");
 200         } else if (token == "\\noun") {
 201                 lex.next();
 202                 font.fontInfo().setNoun(font.setLyXMisc(lex.getString()));
 203         } else if (token == "\\color") {
 204                 lex.next();
 205                 setLyXColor(lex.getString(), font.fontInfo());
 206         } else if (token == "\\InsetSpace" || token == "\\SpecialChar") {
 207
 208                 // Insets don't make sense in a free-spacing context! ---Kayvan
 209                 if (par.isFreeSpacing()) {
 210                         if (token == "\\InsetSpace")
 211                                 par.appendChar(' ', font, change);
 212                         else if (lex.isOK()) {
 213                                 lex.next();
 214                                 string const next_token = lex.getString();
 215                                 if (next_token == "\\-")
 216                                         par.appendChar('-', font, change);
 217                                 else {
 218                                         lex.printError("Token `$$Token' "
 219                                                        "is in free space "
 220                                                        "paragraph layout!");
 221                                 }
 222                         }
 223                 } else {
 224                         auto_ptr<Inset> inset;
 225                         if (token == "\\SpecialChar" )
 226                                 inset.reset(new InsetSpecialChar);
 227                         else
 228                                 inset.reset(new InsetSpace);
 229                         inset->read(buf, lex);
 230                         par.insertInset(par.size(), inset.release(),
 231                                         font, change);
 232                 }
 233         } else if (token == "\\backslash") {
 234                 par.appendChar('\\', font, change);
 235         } else if (token == "\\linebreak") {
 236                 auto_ptr<Inset> inset(new InsetLinebreak);
 237                 inset->read(buf, lex);
 238                 par.insertInset(par.size(), inset.release(), font, change);
 239         } else if (token == "\\newline") {
 240                 auto_ptr<Inset> inset(new InsetNewline);
 241                 inset->read(buf, lex);
 242                 par.insertInset(par.size(), inset.release(), font, change);
 243         } else if (token == "\\LyXTable") {
 244                 auto_ptr<Inset> inset(new InsetTabular(buf));
 245                 inset->read(buf, lex);
 246                 par.insertInset(par.size(), inset.release(), font, change);
 247         } else if (token == "\\hfill") {
 248                 par.insertInset(par.size(), new InsetHFill, font, change);
 249         } else if (token == "\\lyxline") {
 250                 par.insertInset(par.size(), new InsetLine, font, change);
 251         } else if (token == "\\newpage") {
 252                 par.insertInset(par.size(), new InsetNewpage, font, change);
 253         } else if (token == "\\pagebreak") {
 254                 par.insertInset(par.size(), new InsetPagebreak, font, change);
 255         } else if (token == "\\clearpage") {
 256                 par.insertInset(par.size(), new InsetClearPage, font, change);
 257         } else if (token == "\\cleardoublepage") {
 258                 par.insertInset(par.size(), new InsetClearDoublePage, font, change);
 259         } else if (token == "\\change_unchanged") {
 260                 change = Change(Change::UNCHANGED);
 261         } else if (token == "\\change_inserted") {
 262                 lex.eatLine();
 263                 std::istringstream is(lex.getString());
 264                 unsigned int aid;
 265                 time_type ct;
 266                 is >> aid >> ct;
 267                 if (aid >= bp.author_map.size()) {
 268                         errorList.push_back(ErrorItem(_("Change tracking error"),
 269                                             bformat(_("Unknown author index for insertion: %1$d\n"), aid),
 270                                             par.id(), 0, par.size()));
 271                         change = Change(Change::UNCHANGED);
 272                 } else
 273                         change = Change(Change::INSERTED, bp.author_map[aid], ct);
 274         } else if (token == "\\change_deleted") {
 275                 lex.eatLine();
 276                 std::istringstream is(lex.getString());
 277                 unsigned int aid;
 278                 time_type ct;
 279                 is >> aid >> ct;
 280                 if (aid >= bp.author_map.size()) {
 281                         errorList.push_back(ErrorItem(_("Change tracking error"),
 282                                             bformat(_("Unknown author index for deletion: %1$d\n"), aid),
 283                                             par.id(), 0, par.size()));
 284                         change = Change(Change::UNCHANGED);
 285                 } else
 286                         change = Change(Change::DELETED, bp.author_map[aid], ct);
 287         } else {
 288                 lex.eatLine();
 289                 errorList.push_back(ErrorItem(_("Unknown token"),
 290                         bformat(_("Unknown token: %1$s %2$s\n"), from_utf8(token),
 291                         lex.getDocString()),
 292                         par.id(), 0, par.size()));
 293         }
 294 }
 295
 296
 297 void readParagraph(Buffer const & buf, Paragraph & par, Lexer & lex,
 298         ErrorList & errorList)
 299 {
 300         lex.nextToken();
 301         string token = lex.getString();
 302         Font font;
 303         Change change(Change::UNCHANGED);
 304
 305         while (lex.isOK()) {
 306                 readParToken(buf, par, lex, token, font, change, errorList);
 307
 308                 lex.nextToken();
 309                 token = lex.getString();
 310
 311                 if (token.empty())
 312                         continue;
 313
 314                 if (token == "\\end_layout") {
 315                         //Ok, paragraph finished
 316                         break;
 317                 }
 318
 319                 LYXERR(Debug::PARSER, "Handling paragraph token: `" << token << '\'');
 320                 if (token == "\\begin_layout" || token == "\\end_document"
 321                     || token == "\\end_inset" || token == "\\begin_deeper"
 322                     || token == "\\end_deeper") {
 323                         lex.pushToken(token);
 324                         lyxerr << "Paragraph ended in line "
 325                                << lex.getLineNo() << "\n"
 326                                << "Missing \\end_layout.\n";
 327                         break;
 328                 }
 329         }
 330         // Final change goes to paragraph break:
 331         par.setChange(par.size(), change);
 332
 333         // Initialize begin_of_body_ on load; redoParagraph maintains
 334         par.setBeginOfBody();
 335 }
 336
 337
 338 } // namespace anon
 339
 340
 341 bool Text::empty() const
 342 {
 343         return pars_.empty() || (pars_.size() == 1 && pars_[0].empty()
 344                 // FIXME: Should we consider the labeled type as empty too?
 345                 && pars_[0].layout()->labeltype == LABEL_NO_LABEL);
 346 }
 347
 348
 349 double Text::spacing(Buffer const & buffer,
 350                 Paragraph const & par) const
 351 {
 352         if (par.params().spacing().isDefault())
 353                 return buffer.params().spacing().getValue();
 354         return par.params().spacing().getValue();
 355 }
 356
 357
 358 void Text::breakParagraph(Cursor & cur, bool inverse_logic)
 359 {
 360         BOOST_ASSERT(this == cur.text());
 361
 362         Paragraph & cpar = cur.paragraph();
 363         pit_type cpit = cur.pit();
 364
 365         TextClass const & tclass = cur.buffer().params().getTextClass();
 366         LayoutPtr const & layout = cpar.layout();
 367
 368         // this is only allowed, if the current paragraph is not empty
 369         // or caption and if it has not the keepempty flag active
 370         if (cur.lastpos() == 0 && !cpar.allowEmpty() &&
 371             layout->labeltype != LABEL_SENSITIVE)
 372                 return;
 373
 374         // a layout change may affect also the following paragraph
 375         recUndo(cur, cur.pit(), undoSpan(cur.pit()) - 1);
 376
 377         // Always break behind a space
 378         // It is better to erase the space (Dekel)
 379         if (cur.pos() != cur.lastpos() && cpar.isLineSeparator(cur.pos()))
 380                 cpar.eraseChar(cur.pos(), cur.buffer().params().trackChanges);
 381
 382         // What should the layout for the new paragraph be?
 383         bool keep_layout = inverse_logic ?
 384                 !layout->isEnvironment()
 385                 : layout->isEnvironment();
 386
 387         // We need to remember this before we break the paragraph, because
 388         // that invalidates the layout variable
 389         bool sensitive = layout->labeltype == LABEL_SENSITIVE;
 390
 391         // we need to set this before we insert the paragraph.
 392         bool const isempty = cpar.allowEmpty() && cpar.empty();
 393
 394         lyx::breakParagraph(cur.buffer().params(), paragraphs(), cpit,
 395                          cur.pos(), keep_layout);
 396
 397         // After this, neither paragraph contains any rows!
 398
 399         cpit = cur.pit();
 400         pit_type next_par = cpit + 1;
 401
 402         // well this is the caption hack since one caption is really enough
 403         if (sensitive) {
 404                 if (cur.pos() == 0)
 405                         // set to standard-layout
 406                         pars_[cpit].applyLayout(tclass.defaultLayout());
 407                 else
 408                         // set to standard-layout
 409                         pars_[next_par].applyLayout(tclass.defaultLayout());
 410         }
 411
 412         while (!pars_[next_par].empty() && pars_[next_par].isNewline(0)) {
 413                 if (!pars_[next_par].eraseChar(0, cur.buffer().params().trackChanges))
 414                         break; // the character couldn't be deleted physically due to change tracking
 415         }
 416
 417         updateLabels(cur.buffer());
 418
 419         // A singlePar update is not enough in this case.
 420         cur.updateFlags(Update::Force);
 421
 422         // This check is necessary. Otherwise the new empty paragraph will
 423         // be deleted automatically. And it is more friendly for the user!
 424         if (cur.pos() != 0 || isempty)
 425                 setCursor(cur, cur.pit() + 1, 0);
 426         else
 427                 setCursor(cur, cur.pit(), 0);
 428 }
 429
 430
 431 // insert a character, moves all the following breaks in the
 432 // same Paragraph one to the right and make a rebreak
 433 void Text::insertChar(Cursor & cur, char_type c)
 434 {
 435         BOOST_ASSERT(this == cur.text());
 436
 437         cur.recordUndo(INSERT_UNDO);
 438
 439         TextMetrics const & tm = cur.bv().textMetrics(this);
 440         Buffer const & buffer = cur.buffer();
 441         Paragraph & par = cur.paragraph();
 442         // try to remove this
 443         pit_type const pit = cur.pit();
 444
 445         bool const freeSpacing = par.layout()->free_spacing ||
 446                 par.isFreeSpacing();
 447
 448         if (lyxrc.auto_number) {
 449                 static docstring const number_operators = from_ascii("+-/*");
 450                 static docstring const number_unary_operators = from_ascii("+-");
 451                 static docstring const number_seperators = from_ascii(".,:");
 452
 453                 if (cur.current_font.fontInfo().number() == FONT_ON) {
 454                         if (!isDigit(c) && !contains(number_operators, c) &&
 455                             !(contains(number_seperators, c) &&
 456                               cur.pos() != 0 &&
 457                               cur.pos() != cur.lastpos() &&
 458                               tm.getDisplayFont(pit, cur.pos()).fontInfo().number() == FONT_ON &&
 459                               tm.getDisplayFont(pit, cur.pos() - 1).fontInfo().number() == FONT_ON)
 460                            )
 461                                 number(cur); // Set current_font.number to OFF
 462                 } else if (isDigit(c) &&
 463                            cur.real_current_font.isVisibleRightToLeft()) {
 464                         number(cur); // Set current_font.number to ON
 465
 466                         if (cur.pos() != 0) {
 467                                 char_type const c = par.getChar(cur.pos() - 1);
 468                                 if (contains(number_unary_operators, c) &&
 469                                     (cur.pos() == 1
 470                                      || par.isSeparator(cur.pos() - 2)
 471                                      || par.isNewline(cur.pos() - 2))
 472                                   ) {
 473                                         setCharFont(buffer, pit, cur.pos() - 1, cur.current_font,
 474                                                 tm.font_);
 475                                 } else if (contains(number_seperators, c)
 476                                      && cur.pos() >= 2
 477                                      && tm.getDisplayFont(pit, cur.pos() - 2).fontInfo().number() == FONT_ON) {
 478                                         setCharFont(buffer, pit, cur.pos() - 1, cur.current_font,
 479                                                 tm.font_);
 480                                 }
 481                         }
 482                 }
 483         }
 484
 485         // In Bidi text, we want spaces to be treated in a special way: spaces
 486         // which are between words in different languages should get the
 487         // paragraph's language; otherwise, spaces should keep the language
 488         // they were originally typed in. This is only in effect while typing;
 489         // after the text is already typed in, the user can always go back and
 490         // explicitly set the language of a space as desired. But 99.9% of the
 491         // time, what we're doing here is what the user actually meant.
 492         //
 493         // The following cases are the ones in which the language of the space
 494         // should be changed to match that of the containing paragraph. In the
 495         // depictions, lowercase is LTR, uppercase is RTL, underscore (_)
 496         // represents a space, pipe (|) represents the cursor position (so the
 497         // character before it is the one just typed in). The different cases
 498         // are depicted logically (not visually), from left to right:
 499         //
 500         // 1. A_a|
 501         // 2. a_A|
 502         //
 503         // Theoretically, there are other situations that we should, perhaps, deal
 504         // with (e.g.: a|_A, A|_a). In practice, though, there really isn't any
 505         // point (to understand why, just try to create this situation...).
 506
 507         if ((cur.pos() >= 2) && (par.isLineSeparator(cur.pos() - 1))) {
 508                 // get font in front and behind the space in question. But do NOT
 509                 // use getFont(cur.pos()) because the character c is not inserted yet
 510                 Font const pre_space_font  = tm.getDisplayFont(cur.pit(), cur.pos() - 2);
 511                 Font const & post_space_font = cur.real_current_font;
 512                 bool pre_space_rtl  = pre_space_font.isVisibleRightToLeft();
 513                 bool post_space_rtl = post_space_font.isVisibleRightToLeft();
 514
 515                 if (pre_space_rtl != post_space_rtl) {
 516                         // Set the space's language to match the language of the
 517                         // adjacent character whose direction is the paragraph's
 518                         // direction; don't touch other properties of the font
 519                         Language const * lang =
 520                                 (pre_space_rtl == par.isRTL(buffer.params())) ?
 521                                 pre_space_font.language() : post_space_font.language();
 522
 523                         Font space_font = tm.getDisplayFont(cur.pit(), cur.pos() - 1);
 524                         space_font.setLanguage(lang);
 525                         par.setFont(cur.pos() - 1, space_font);
 526                 }
 527         }
 528
 529         // Next check, if there will be two blanks together or a blank at
 530         // the beginning of a paragraph.
 531         // I decided to handle blanks like normal characters, the main
 532         // difference are the special checks when calculating the row.fill
 533         // (blank does not count at the end of a row) and the check here
 534
 535         // When the free-spacing option is set for the current layout,
 536         // disable the double-space checking
 537         if (!freeSpacing && isLineSeparatorChar(c)) {
 538                 if (cur.pos() == 0) {
 539                         static bool sent_space_message = false;
 540                         if (!sent_space_message) {
 541                                 cur.message(_("You cannot insert a space at the "
 542                                                            "beginning of a paragraph. Please read the Tutorial."));
 543                                 sent_space_message = true;
 544                         }
 545                         return;
 546                 }
 547                 BOOST_ASSERT(cur.pos() > 0);
 548                 if ((par.isLineSeparator(cur.pos() - 1) || par.isNewline(cur.pos() - 1))
 549                     && !par.isDeleted(cur.pos() - 1)) {
 550                         static bool sent_space_message = false;
 551                         if (!sent_space_message) {
 552                                 cur.message(_("You cannot type two spaces this way. "
 553                                                            "Please read the Tutorial."));
 554                                 sent_space_message = true;
 555                         }
 556                         return;
 557                 }
 558         }
 559
 560         par.insertChar(cur.pos(), c, cur.current_font, cur.buffer().params().trackChanges);
 561         checkBufferStructure(cur.buffer(), cur);
 562
 563 //              cur.updateFlags(Update::Force);
 564         setCursor(cur.top(), cur.pit(), cur.pos() + 1);
 565         charInserted(cur);
 566 }
 567
 568
 569 void Text::charInserted(Cursor & cur)
 570 {
 571         // Here we call finishUndo for every 20 characters inserted.
 572         // This is from my experience how emacs does it. (Lgb)
 573         static unsigned int counter;
 574         if (counter < 20) {
 575                 ++counter;
 576         } else {
 577                 cur.finishUndo();
 578                 counter = 0;
 579         }
 580 }
 581
 582
 583 // the cursor set functions have a special mechanism. When they
 584 // realize, that you left an empty paragraph, they will delete it.
 585
 586 bool Text::cursorForwardOneWord(Cursor & cur)
 587 {
 588         BOOST_ASSERT(this == cur.text());
 589
 590         Cursor old = cur;
 591
 592         if (old.pos() == old.lastpos() && old.pit() != old.lastpit()) {
 593                 ++old.pit();
 594                 old.pos() = 0;
 595         } else {
 596                 // Advance through word.
 597                 while (old.pos() != old.lastpos() && old.paragraph().isLetter(old.pos()))
 598                         ++old.pos();
 599                 // Skip through trailing nonword stuff.
 600                 while (old.pos() != old.lastpos() && !old.paragraph().isLetter(old.pos()))
 601                         ++old.pos();
 602         }
 603         return setCursor(cur, old.pit(), old.pos());
 604 }
 605
 606
 607 bool Text::cursorBackwardOneWord(Cursor & cur)
 608 {
 609         BOOST_ASSERT(this == cur.text());
 610
 611         Cursor old = cur;
 612
 613         if (old.pos() == 0 && old.pit() != 0) {
 614                 --old.pit();
 615                 old.pos() = old.lastpos();
 616         } else {
 617                 // Skip through initial nonword stuff.
 618                 while (old.pos() != 0 && !old.paragraph().isLetter(old.pos() - 1))
 619                         --old.pos();
 620                 // Advance through word.
 621                 while (old.pos() != 0 && old.paragraph().isLetter(old.pos() - 1))
 622                         --old.pos();
 623         }
 624         return setCursor(cur, old.pit(), old.pos());
 625 }
 626
 627
 628 void Text::selectWord(Cursor & cur, word_location loc)
 629 {
 630         BOOST_ASSERT(this == cur.text());
 631         CursorSlice from = cur.top();
 632         CursorSlice to = cur.top();
 633         getWord(from, to, loc);
 634         if (cur.top() != from)
 635                 setCursor(cur, from.pit(), from.pos());
 636         if (to == from)
 637                 return;
 638         cur.resetAnchor();
 639         setCursor(cur, to.pit(), to.pos());
 640         cur.setSelection();
 641 }
 642
 643
 644 // Select the word currently under the cursor when no
 645 // selection is currently set
 646 bool Text::selectWordWhenUnderCursor(Cursor & cur, word_location loc)
 647 {
 648         BOOST_ASSERT(this == cur.text());
 649         if (cur.selection())
 650                 return false;
 651         selectWord(cur, loc);
 652         return cur.selection();
 653 }
 654
 655
 656 void Text::acceptOrRejectChanges(Cursor & cur, ChangeOp op)
 657 {
 658         BOOST_ASSERT(this == cur.text());
 659
 660         if (!cur.selection())
 661                 return;
 662
 663         cur.recordUndoSelection();
 664
 665         pit_type begPit = cur.selectionBegin().pit();
 666         pit_type endPit = cur.selectionEnd().pit();
 667
 668         pos_type begPos = cur.selectionBegin().pos();
 669         pos_type endPos = cur.selectionEnd().pos();
 670
 671         // keep selection info, because endPos becomes invalid after the first loop
 672         bool endsBeforeEndOfPar = (endPos < pars_[endPit].size());
 673
 674         // first, accept/reject changes within each individual paragraph (do not consider end-of-par)
 675
 676         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 677                 pos_type parSize = pars_[pit].size();
 678
 679                 // ignore empty paragraphs; otherwise, an assertion will fail for
 680                 // acceptChanges(bparams, 0, 0) or rejectChanges(bparams, 0, 0)
 681                 if (parSize == 0)
 682                         continue;
 683
 684                 // do not consider first paragraph if the cursor starts at pos size()
 685                 if (pit == begPit && begPos == parSize)
 686                         continue;
 687
 688                 // do not consider last paragraph if the cursor ends at pos 0
 689                 if (pit == endPit && endPos == 0)
 690                         break; // last iteration anyway
 691
 692                 pos_type left  = (pit == begPit ? begPos : 0);
 693                 pos_type right = (pit == endPit ? endPos : parSize);
 694
 695                 if (op == ACCEPT) {
 696                         pars_[pit].acceptChanges(cur.buffer().params(), left, right);
 697                 } else {
 698                         pars_[pit].rejectChanges(cur.buffer().params(), left, right);
 699                 }
 700         }
 701
 702         // next, accept/reject imaginary end-of-par characters
 703
 704         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 705                 pos_type pos = pars_[pit].size();
 706
 707                 // skip if the selection ends before the end-of-par
 708                 if (pit == endPit && endsBeforeEndOfPar)
 709                         break; // last iteration anyway
 710
 711                 // skip if this is not the last paragraph of the document
 712                 // note: the user should be able to accept/reject the par break of the last par!
 713                 if (pit == endPit && pit + 1 != int(pars_.size()))
 714                         break; // last iteration anway
 715
 716                 if (op == ACCEPT) {
 717                         if (pars_[pit].isInserted(pos)) {
 718                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 719                         } else if (pars_[pit].isDeleted(pos)) {
 720                                 if (pit + 1 == int(pars_.size())) {
 721                                         // we cannot remove a par break at the end of the last paragraph;
 722                                         // instead, we mark it unchanged
 723                                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 724                                 } else {
 725                                         mergeParagraph(cur.buffer().params(), pars_, pit);
 726                                         --endPit;
 727                                         --pit;
 728                                 }
 729                         }
 730                 } else {
 731                         if (pars_[pit].isDeleted(pos)) {
 732                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 733                         } else if (pars_[pit].isInserted(pos)) {
 734                                 if (pit + 1 == int(pars_.size())) {
 735                                         // we mark the par break at the end of the last paragraph unchanged
 736                                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 737                                 } else {
 738                                         mergeParagraph(cur.buffer().params(), pars_, pit);
 739                                         --endPit;
 740                                         --pit;
 741                                 }
 742                         }
 743                 }
 744         }
 745
 746         // finally, invoke the DEPM
 747
 748         deleteEmptyParagraphMechanism(begPit, endPit, cur.buffer().params().trackChanges);
 749
 750         //
 751
 752         cur.finishUndo();
 753         cur.clearSelection();
 754         setCursorIntern(cur, begPit, begPos);
 755         cur.updateFlags(Update::Force);
 756         updateLabels(cur.buffer());
 757 }
 758
 759
 760 void Text::acceptChanges(BufferParams const & bparams)
 761 {
 762         lyx::acceptChanges(pars_, bparams);
 763         deleteEmptyParagraphMechanism(0, pars_.size() - 1, bparams.trackChanges);
 764 }
 765
 766
 767 void Text::rejectChanges(BufferParams const & bparams)
 768 {
 769         pit_type pars_size = static_cast<pit_type>(pars_.size());
 770
 771         // first, reject changes within each individual paragraph
 772         // (do not consider end-of-par)
 773         for (pit_type pit = 0; pit < pars_size; ++pit) {
 774                 if (!pars_[pit].empty())   // prevent assertion failure
 775                         pars_[pit].rejectChanges(bparams, 0, pars_[pit].size());
 776         }
 777
 778         // next, reject imaginary end-of-par characters
 779         for (pit_type pit = 0; pit < pars_size; ++pit) {
 780                 pos_type pos = pars_[pit].size();
 781
 782                 if (pars_[pit].isDeleted(pos)) {
 783                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 784                 } else if (pars_[pit].isInserted(pos)) {
 785                         if (pit == pars_size - 1) {
 786                                 // we mark the par break at the end of the last
 787                                 // paragraph unchanged
 788                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 789                         } else {
 790                                 mergeParagraph(bparams, pars_, pit);
 791                                 --pit;
 792                                 --pars_size;
 793                         }
 794                 }
 795         }
 796
 797         // finally, invoke the DEPM
 798         deleteEmptyParagraphMechanism(0, pars_size - 1, bparams.trackChanges);
 799 }
 800
 801
 802 void Text::deleteWordForward(Cursor & cur)
 803 {
 804         BOOST_ASSERT(this == cur.text());
 805         if (cur.lastpos() == 0)
 806                 cursorForward(cur);
 807         else {
 808                 cur.resetAnchor();
 809                 cur.selection() = true;
 810                 cursorForwardOneWord(cur);
 811                 cur.setSelection();
 812                 cutSelection(cur, true, false);
 813                 checkBufferStructure(cur.buffer(), cur);
 814         }
 815 }
 816
 817
 818 void Text::deleteWordBackward(Cursor & cur)
 819 {
 820         BOOST_ASSERT(this == cur.text());
 821         if (cur.lastpos() == 0)
 822                 cursorBackward(cur);
 823         else {
 824                 cur.resetAnchor();
 825                 cur.selection() = true;
 826                 cursorBackwardOneWord(cur);
 827                 cur.setSelection();
 828                 cutSelection(cur, true, false);
 829                 checkBufferStructure(cur.buffer(), cur);
 830         }
 831 }
 832
 833
 834 // Kill to end of line.
 835 void Text::changeCase(Cursor & cur, TextCase action)
 836 {
 837         BOOST_ASSERT(this == cur.text());
 838         CursorSlice from;
 839         CursorSlice to;
 840
 841         if (cur.selection()) {
 842                 from = cur.selBegin();
 843                 to = cur.selEnd();
 844         } else {
 845                 from = cur.top();
 846                 getWord(from, to, PARTIAL_WORD);
 847                 cursorForwardOneWord(cur);
 848         }
 849
 850         cur.recordUndoSelection();
 851
 852         pit_type begPit = from.pit();
 853         pit_type endPit = to.pit();
 854
 855         pos_type begPos = from.pos();
 856         pos_type endPos = to.pos();
 857
 858         pos_type right = 0; // needed after the for loop
 859
 860         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 861                 Paragraph & par = pars_[pit];
 862                 pos_type const pos = (pit == begPit ? begPos : 0);
 863                 right = (pit == endPit ? endPos : par.size());
 864                 par.changeCase(cur.buffer().params(), pos, right, action);
 865         }
 866
 867         // the selection may have changed due to logically-only deleted chars
 868         setCursor(cur, begPit, begPos);
 869         cur.resetAnchor();
 870         setCursor(cur, endPit, right);
 871         cur.setSelection();
 872
 873         checkBufferStructure(cur.buffer(), cur);
 874 }
 875
 876
 877 bool Text::handleBibitems(Cursor & cur)
 878 {
 879         if (cur.paragraph().layout()->labeltype != LABEL_BIBLIO)
 880                 return false;
 881         // if a bibitem is deleted, merge with previous paragraph
 882         // if this is a bibliography item as well
 883         if (cur.pos() == 0) {
 884                 BufferParams const & bufparams = cur.buffer().params();
 885                 Paragraph const & par = cur.paragraph();
 886                 Cursor prevcur = cur;
 887                 if (cur.pit() > 0) {
 888                         --prevcur.pit();
 889                         prevcur.pos() = prevcur.lastpos();
 890                 }
 891                 Paragraph const & prevpar = prevcur.paragraph();
 892                 if (cur.pit() > 0 && par.layout() == prevpar.layout()) {
 893                         cur.recordUndo(ATOMIC_UNDO, prevcur.pit());
 894                         mergeParagraph(bufparams, cur.text()->paragraphs(),
 895                                        prevcur.pit());
 896                         updateLabels(cur.buffer());
 897                         setCursorIntern(cur, prevcur.pit(), prevcur.pos());
 898                         cur.updateFlags(Update::Force);
 899                 // if not, reset the paragraph to default
 900                 } else
 901                         cur.paragraph().layout(
 902                                 bufparams.getTextClass().defaultLayout());
 903                 return true;
 904         }
 905         return false;
 906 }
 907
 908
 909 bool Text::erase(Cursor & cur)
 910 {
 911         BOOST_ASSERT(this == cur.text());
 912         bool needsUpdate = false;
 913         Paragraph & par = cur.paragraph();
 914
 915         if (cur.pos() != cur.lastpos()) {
 916                 // this is the code for a normal delete, not pasting
 917                 // any paragraphs
 918                 cur.recordUndo(DELETE_UNDO);
 919                 if(!par.eraseChar(cur.pos(), cur.buffer().params().trackChanges)) {
 920                         // the character has been logically deleted only => skip it
 921                         cur.top().forwardPos();
 922                 }
 923                 checkBufferStructure(cur.buffer(), cur);
 924                 needsUpdate = true;
 925         } else {
 926                 if (cur.pit() == cur.lastpit())
 927                         return dissolveInset(cur);
 928
 929                 if (!par.isMergedOnEndOfParDeletion(cur.buffer().params().trackChanges)) {
 930                         par.setChange(cur.pos(), Change(Change::DELETED));
 931                         cur.forwardPos();
 932                         needsUpdate = true;
 933                 } else {
 934                         setCursorIntern(cur, cur.pit() + 1, 0);
 935                         needsUpdate = backspacePos0(cur);
 936                 }
 937         }
 938
 939         needsUpdate |= handleBibitems(cur);
 940
 941         if (needsUpdate) {
 942                 // Make sure the cursor is correct. Is this really needed?
 943                 // No, not really... at least not here!
 944                 cur.text()->setCursor(cur.top(), cur.pit(), cur.pos());
 945                 checkBufferStructure(cur.buffer(), cur);
 946         }
 947
 948         return needsUpdate;
 949 }
 950
 951
 952 bool Text::backspacePos0(Cursor & cur)
 953 {
 954         BOOST_ASSERT(this == cur.text());
 955         if (cur.pit() == 0)
 956                 return false;
 957
 958         bool needsUpdate = false;
 959
 960         BufferParams const & bufparams = cur.buffer().params();
 961         TextClass const & tclass = bufparams.getTextClass();
 962         ParagraphList & plist = cur.text()->paragraphs();
 963         Paragraph const & par = cur.paragraph();
 964         Cursor prevcur = cur;
 965         --prevcur.pit();
 966         prevcur.pos() = prevcur.lastpos();
 967         Paragraph const & prevpar = prevcur.paragraph();
 968
 969         // is it an empty paragraph?
 970         if (cur.lastpos() == 0
 971             || (cur.lastpos() == 1 && par.isSeparator(0))) {
 972                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit(), cur.pit());
 973                 plist.erase(boost::next(plist.begin(), cur.pit()));
 974                 needsUpdate = true;
 975         }
 976         // is previous par empty?
 977         else if (prevcur.lastpos() == 0
 978                  || (prevcur.lastpos() == 1 && prevpar.isSeparator(0))) {
 979                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit(), cur.pit());
 980                 plist.erase(boost::next(plist.begin(), prevcur.pit()));
 981                 needsUpdate = true;
 982         }
 983         // Pasting is not allowed, if the paragraphs have different
 984         // layouts. I think it is a real bug of all other
 985         // word processors to allow it. It confuses the user.
 986         // Correction: Pasting is always allowed with standard-layout
 987         else if (par.layout() == prevpar.layout()
 988                  || par.layout() == tclass.defaultLayout()) {
 989                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit());
 990                 mergeParagraph(bufparams, plist, prevcur.pit());
 991                 needsUpdate = true;
 992         }
 993
 994         if (needsUpdate) {
 995                 updateLabels(cur.buffer());
 996                 setCursorIntern(cur, prevcur.pit(), prevcur.pos());
 997         }
 998
 999         return needsUpdate;
1000 }
1001
1002
1003 bool Text::backspace(Cursor & cur)
1004 {
1005         BOOST_ASSERT(this == cur.text());
1006         bool needsUpdate = false;
1007         if (cur.pos() == 0) {
1008                 if (cur.pit() == 0)
1009                         return dissolveInset(cur);
1010
1011                 Paragraph & prev_par = pars_[cur.pit() - 1];
1012
1013                 if (!prev_par.isMergedOnEndOfParDeletion(cur.buffer().params().trackChanges)) {
1014                         prev_par.setChange(prev_par.size(), Change(Change::DELETED));
1015                         setCursorIntern(cur, cur.pit() - 1, prev_par.size());
1016                         return true;
1017                 }
1018                 // The cursor is at the beginning of a paragraph, so
1019                 // the backspace will collapse two paragraphs into one.
1020                 needsUpdate = backspacePos0(cur);
1021
1022         } else {
1023                 // this is the code for a normal backspace, not pasting
1024                 // any paragraphs
1025                 cur.recordUndo(DELETE_UNDO);
1026                 // We used to do cursorBackwardIntern() here, but it is
1027                 // not a good idea since it triggers the auto-delete
1028                 // mechanism. So we do a cursorBackwardIntern()-lite,
1029                 // without the dreaded mechanism. (JMarc)
1030                 setCursorIntern(cur, cur.pit(), cur.pos() - 1,
1031                                 false, cur.boundary());
1032                 cur.paragraph().eraseChar(cur.pos(), cur.buffer().params().trackChanges);
1033                 checkBufferStructure(cur.buffer(), cur);
1034         }
1035
1036         if (cur.pos() == cur.lastpos())
1037                 cur.setCurrentFont();
1038
1039         needsUpdate |= handleBibitems(cur);
1040
1041         // A singlePar update is not enough in this case.
1042 //              cur.updateFlags(Update::Force);
1043         setCursor(cur.top(), cur.pit(), cur.pos());
1044
1045         return needsUpdate;
1046 }
1047
1048
1049 bool Text::dissolveInset(Cursor & cur) {
1050         BOOST_ASSERT(this == cur.text());
1051
1052         if (isMainText(cur.bv().buffer()) || cur.inset().nargs() != 1)
1053                 return false;
1054
1055         cur.recordUndoInset();
1056         cur.selHandle(false);
1057         // save position
1058         pos_type spos = cur.pos();
1059         pit_type spit = cur.pit();
1060         ParagraphList plist;
1061         if (cur.lastpit() != 0 || cur.lastpos() != 0)
1062                 plist = paragraphs();
1063         cur.popBackward();
1064         // store cursor offset
1065         if (spit == 0)
1066                 spos += cur.pos();
1067         spit += cur.pit();
1068         Buffer & b = cur.buffer();
1069         cur.paragraph().eraseChar(cur.pos(), b.params().trackChanges);
1070         if (!plist.empty()) {
1071                 // ERT paragraphs have the Language latex_language.
1072                 // This is invalid outside of ERT, so we need to
1073                 // change it to the buffer language.
1074                 ParagraphList::iterator it = plist.begin();
1075                 ParagraphList::iterator it_end = plist.end();
1076                 for (; it != it_end; it++)
1077                         it->changeLanguage(b.params(), latex_language, b.language());
1078
1079                 pasteParagraphList(cur, plist, b.params().getTextClassPtr(),
1080                                    b.errorList("Paste"));
1081                 // restore position
1082                 cur.pit() = std::min(cur.lastpit(), spit);
1083                 cur.pos() = std::min(cur.lastpos(), spos);
1084         }
1085         cur.clearSelection();
1086         cur.resetAnchor();
1087         return true;
1088 }
1089
1090
1091 void Text::getWord(CursorSlice & from, CursorSlice & to,
1092         word_location const loc)
1093 {
1094         Paragraph const & from_par = pars_[from.pit()];
1095         switch (loc) {
1096         case WHOLE_WORD_STRICT:
1097                 if (from.pos() == 0 || from.pos() == from_par.size()
1098                     || !from_par.isLetter(from.pos())
1099                     || !from_par.isLetter(from.pos() - 1)) {
1100                         to = from;
1101                         return;
1102                 }
1103                 // no break here, we go to the next
1104
1105         case WHOLE_WORD:
1106                 // If we are already at the beginning of a word, do nothing
1107                 if (!from.pos() || !from_par.isLetter(from.pos() - 1))
1108                         break;
1109                 // no break here, we go to the next
1110
1111         case PREVIOUS_WORD:
1112                 // always move the cursor to the beginning of previous word
1113                 while (from.pos() && from_par.isLetter(from.pos() - 1))
1114                         --from.pos();
1115                 break;
1116         case NEXT_WORD:
1117                 lyxerr << "Text::getWord: NEXT_WORD not implemented yet"
1118                        << endl;
1119                 break;
1120         case PARTIAL_WORD:
1121                 // no need to move the 'from' cursor
1122                 break;
1123         }
1124         to = from;
1125         Paragraph & to_par = pars_[to.pit()];
1126         while (to.pos() < to_par.size() && to_par.isLetter(to.pos()))
1127                 ++to.pos();
1128 }
1129
1130
1131 void Text::write(Buffer const & buf, std::ostream & os) const
1132 {
1133         ParagraphList::const_iterator pit = paragraphs().begin();
1134         ParagraphList::const_iterator end = paragraphs().end();
1135         depth_type dth = 0;
1136         for (; pit != end; ++pit)
1137                 pit->write(buf, os, buf.params(), dth);
1138
1139         // Close begin_deeper
1140         for(; dth > 0; --dth)
1141                 os << "\n\\end_deeper";
1142 }
1143
1144
1145 bool Text::read(Buffer const & buf, Lexer & lex, ErrorList & errorList)
1146 {
1147         depth_type depth = 0;
1148
1149         while (lex.isOK()) {
1150                 lex.nextToken();
1151                 string const token = lex.getString();
1152
1153                 if (token.empty())
1154                         continue;
1155
1156                 if (token == "\\end_inset")
1157                         break;
1158
1159                 if (token == "\\end_body")
1160                         continue;
1161
1162                 if (token == "\\begin_body")
1163                         continue;
1164
1165                 if (token == "\\end_document")
1166                         return false;
1167
1168                 if (token == "\\begin_layout") {
1169                         lex.pushToken(token);
1170
1171                         Paragraph par;
1172                         par.params().depth(depth);
1173                         par.setFont(0, Font(inherit_font, buf.params().language));
1174                         pars_.push_back(par);
1175
1176                         // FIXME: goddamn InsetTabular makes us pass a Buffer
1177                         // not BufferParams
1178                         lyx::readParagraph(buf, pars_.back(), lex, errorList);
1179
1180                 } else if (token == "\\begin_deeper") {
1181                         ++depth;
1182                 } else if (token == "\\end_deeper") {
1183                         if (!depth) {
1184                                 lex.printError("\\end_deeper: " "depth is already null");
1185                         } else {
1186                                 --depth;
1187                         }
1188                 } else {
1189                         lyxerr << "Handling unknown body token: `"
1190                                << token << '\'' << endl;
1191                 }
1192         }
1193         return true;
1194 }
1195
1196 // Returns the current font and depth as a message.
1197 docstring Text::currentState(Cursor & cur)
1198 {
1199         BOOST_ASSERT(this == cur.text());
1200         Buffer & buf = cur.buffer();
1201         Paragraph const & par = cur.paragraph();
1202         odocstringstream os;
1203
1204         if (buf.params().trackChanges)
1205                 os << _("[Change Tracking] ");
1206
1207         Change change = par.lookupChange(cur.pos());
1208
1209         if (change.type != Change::UNCHANGED) {
1210                 Author const & a = buf.params().authors().get(change.author);
1211                 os << _("Change: ") << a.name();
1212                 if (!a.email().empty())
1213                         os << " (" << a.email() << ")";
1214                 // FIXME ctime is english, we should translate that
1215                 os << _(" at ") << ctime(&change.changetime);
1216                 os << " : ";
1217         }
1218
1219         // I think we should only show changes from the default
1220         // font. (Asger)
1221         // No, from the document font (MV)
1222         Font font = cur.real_current_font;
1223         font.fontInfo().reduce(buf.params().getFont().fontInfo());
1224
1225         os << bformat(_("Font: %1$s"), font.stateText(&buf.params()));
1226
1227         // The paragraph depth
1228         int depth = cur.paragraph().getDepth();
1229         if (depth > 0)
1230                 os << bformat(_(", Depth: %1$d"), depth);
1231
1232         // The paragraph spacing, but only if different from
1233         // buffer spacing.
1234         Spacing const & spacing = par.params().spacing();
1235         if (!spacing.isDefault()) {
1236                 os << _(", Spacing: ");
1237                 switch (spacing.getSpace()) {
1238                 case Spacing::Single:
1239                         os << _("Single");
1240                         break;
1241                 case Spacing::Onehalf:
1242                         os << _("OneHalf");
1243                         break;
1244                 case Spacing::Double:
1245                         os << _("Double");
1246                         break;
1247                 case Spacing::Other:
1248                         os << _("Other (") << from_ascii(spacing.getValueAsString()) << ')';
1249                         break;
1250                 case Spacing::Default:
1251                         // should never happen, do nothing
1252                         break;
1253                 }
1254         }
1255
1256 #ifdef DEVEL_VERSION
1257         os << _(", Inset: ") << &cur.inset();
1258         os << _(", Paragraph: ") << cur.pit();
1259         os << _(", Id: ") << par.id();
1260         os << _(", Position: ") << cur.pos();
1261         // FIXME: Why is the check for par.size() needed?
1262         // We are called with cur.pos() == par.size() quite often.
1263         if (!par.empty() && cur.pos() < par.size()) {
1264                 // Force output of code point, not character
1265                 size_t const c = par.getChar(cur.pos());
1266                 os << _(", Char: 0x") << std::hex << c;
1267         }
1268         os << _(", Boundary: ") << cur.boundary();
1269 //      Row & row = cur.textRow();
1270 //      os << bformat(_(", Row b:%1$d e:%2$d"), row.pos(), row.endpos());
1271 #endif
1272         return os.str();
1273 }
1274
1275
1276 docstring Text::getPossibleLabel(Cursor & cur) const
1277 {
1278         pit_type pit = cur.pit();
1279
1280         LayoutPtr layout = pars_[pit].layout();
1281
1282         docstring text;
1283         docstring par_text = pars_[pit].asString(cur.buffer(), false);
1284         string piece;
1285         // the return string of math matrices might contain linebreaks
1286         par_text = subst(par_text, '\n', '-');
1287         for (int i = 0; i < lyxrc.label_init_length; ++i) {
1288                 if (par_text.empty())
1289                         break;
1290                 docstring head;
1291                 par_text = split(par_text, head, ' ');
1292                 // Is it legal to use spaces in labels ?
1293                 if (i > 0)
1294                         text += '-';
1295                 text += head;
1296         }
1297
1298         // No need for a prefix if the user said so.
1299         if (lyxrc.label_init_length <= 0)
1300                 return text;
1301
1302         // Will contain the label type.
1303         docstring name;
1304
1305         // For section, subsection, etc...
1306         if (layout->latextype == LATEX_PARAGRAPH && pit != 0) {
1307                 LayoutPtr const & layout2 = pars_[pit - 1].layout();
1308                 if (layout2->latextype != LATEX_PARAGRAPH) {
1309                         --pit;
1310                         layout = layout2;
1311                 }
1312         }
1313         if (layout->latextype != LATEX_PARAGRAPH)
1314                 name = from_ascii(layout->latexname());
1315
1316         // for captions, we just take the caption type
1317         Inset * caption_inset = cur.innerInsetOfType(CAPTION_CODE);
1318         if (caption_inset)
1319                 name = from_ascii(static_cast<InsetCaption *>(caption_inset)->type());
1320
1321         // If none of the above worked, we'll see if we're inside various
1322         // types of insets and take our abbreviation from them.
1323         if (name.empty()) {
1324                 InsetCode const codes[] = {
1325                         FLOAT_CODE,
1326                         WRAP_CODE,
1327                         FOOT_CODE
1328                 };
1329                 for (unsigned int i = 0; i < (sizeof codes / sizeof codes[0]); ++i) {
1330                         Inset * float_inset = cur.innerInsetOfType(codes[i]);
1331                         if (float_inset) {
1332                                 name = float_inset->name();
1333                                 break;
1334                         }
1335                 }
1336         }
1337
1338         // Create a correct prefix for prettyref
1339         if (name == "theorem")
1340                 name = from_ascii("thm");
1341         else if (name == "Foot")
1342                 name = from_ascii("fn");
1343         else if (name == "listing")
1344                 name = from_ascii("lst");
1345
1346         if (!name.empty())
1347                 text = name.substr(0, 3) + ':' + text;
1348
1349         return text;
1350 }
1351
1352
1353 void Text::charsTranspose(Cursor & cur)
1354 {
1355         BOOST_ASSERT(this == cur.text());
1356
1357         pos_type pos = cur.pos();
1358
1359         // If cursor is at beginning or end of paragraph, do nothing.
1360         if (pos == cur.lastpos() || pos == 0)
1361                 return;
1362
1363         Paragraph & par = cur.paragraph();
1364
1365         // Get the positions of the characters to be transposed.
1366         pos_type pos1 = pos - 1;
1367         pos_type pos2 = pos;
1368
1369         // In change tracking mode, ignore deleted characters.
1370         while (pos2 < cur.lastpos() && par.isDeleted(pos2))
1371                 ++pos2;
1372         if (pos2 == cur.lastpos())
1373                 return;
1374
1375         while (pos1 >= 0 && par.isDeleted(pos1))
1376                 --pos1;
1377         if (pos1 < 0)
1378                 return;
1379
1380         // Don't do anything if one of the "characters" is not regular text.
1381         if (par.isInset(pos1) || par.isInset(pos2))
1382                 return;
1383
1384         // Store the characters to be transposed (including font information).
1385         char_type char1 = par.getChar(pos1);
1386         Font const font1 =
1387                 par.getFontSettings(cur.buffer().params(), pos1);
1388
1389         char_type char2 = par.getChar(pos2);
1390         Font const font2 =
1391                 par.getFontSettings(cur.buffer().params(), pos2);
1392
1393         // And finally, we are ready to perform the transposition.
1394         // Track the changes if Change Tracking is enabled.
1395         bool const trackChanges = cur.buffer().params().trackChanges;
1396
1397         cur.recordUndo();
1398
1399         par.eraseChar(pos2, trackChanges);
1400         par.eraseChar(pos1, trackChanges);
1401         par.insertChar(pos1, char2, font2, trackChanges);
1402         par.insertChar(pos2, char1, font1, trackChanges);
1403
1404         checkBufferStructure(cur.buffer(), cur);
1405
1406         // After the transposition, move cursor to after the transposition.
1407         setCursor(cur, cur.pit(), pos2);
1408         cur.forwardPos();
1409 }
1410
1411
1412 } // namespace lyx