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