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 "DispatchResult.h"
  33 #include "Encoding.h"
  34 #include "ErrorList.h"
  35 #include "FuncRequest.h"
  36 #include "factory.h"
  37 #include "FontIterator.h"
  38 #include "Language.h"
  39 #include "Length.h"
  40 #include "Lexer.h"
  41 #include "LyXRC.h"
  42 #include "Paragraph.h"
  43 #include "paragraph_funcs.h"
  44 #include "ParagraphParameters.h"
  45 #include "TextClass.h"
  46 #include "TextMetrics.h"
  47 #include "VSpace.h"
  48 #include "WordLangTuple.h"
  49
  50 #include "frontends/FontMetrics.h"
  51 #include "frontends/Painter.h"
  52
  53 #include "insets/InsetText.h"
  54 #include "insets/InsetBibitem.h"
  55 #include "insets/InsetCaption.h"
  56 #include "insets/InsetHFill.h"
  57 #include "insets/InsetLine.h"
  58 #include "insets/InsetNewline.h"
  59 #include "insets/InsetNewpage.h"
  60 #include "insets/InsetOptArg.h"
  61 #include "insets/InsetSpace.h"
  62 #include "insets/InsetSpecialChar.h"
  63 #include "insets/InsetTabular.h"
  64
  65 #include "support/convert.h"
  66 #include "support/debug.h"
  67 #include "support/docstream.h"
  68 #include "support/gettext.h"
  69 #include "support/lstrings.h"
  70 #include "support/textutils.h"
  71
  72 #include <boost/next_prior.hpp>
  73
  74 #include <sstream>
  75
  76 using std::auto_ptr;
  77 using std::string;
  78
  79 namespace lyx {
  80
  81 using support::bformat;
  82 using support::contains;
  83 using support::split;
  84 using support::subst;
  85
  86 using cap::cutSelection;
  87 using cap::pasteParagraphList;
  88
  89 using frontend::FontMetrics;
  90
  91 namespace {
  92
  93 void readParToken(Buffer const & buf, Paragraph & par, Lexer & lex,
  94         string const & token, Font & font, Change & change, ErrorList & errorList)
  95 {
  96         BufferParams const & bp = buf.params();
  97
  98         if (token[0] != '\\') {
  99                 docstring dstr = lex.getDocString();
 100                 par.appendString(dstr, font, change);
 101
 102         } else if (token == "\\begin_layout") {
 103                 lex.eatLine();
 104                 docstring layoutname = lex.getDocString();
 105
 106                 font = Font(inherit_font, bp.language);
 107                 change = Change(Change::UNCHANGED);
 108
 109                 TextClass const & tclass = bp.getTextClass();
 110
 111                 if (layoutname.empty()) {
 112                         layoutname = tclass.defaultLayoutName();
 113                 }
 114
 115                 bool hasLayout = tclass.hasLayout(layoutname);
 116
 117                 if (!hasLayout) {
 118                         errorList.push_back(ErrorItem(_("Unknown layout"),
 119                         bformat(_("Layout '%1$s' does not exist in textclass '%2$s'\nTrying to use the default instead.\n"),
 120                         layoutname, from_utf8(tclass.name())), par.id(), 0, par.size()));
 121                         layoutname = tclass.defaultLayoutName();
 122                 }
 123
 124                 par.layout(bp.getTextClass()[layoutname]);
 125
 126                 // Test whether the layout is obsolete.
 127                 LayoutPtr const & layout = par.layout();
 128                 if (!layout->obsoleted_by().empty())
 129                         par.layout(bp.getTextClass()[layout->obsoleted_by()]);
 130
 131                 par.params().read(lex);
 132
 133         } else if (token == "\\end_layout") {
 134                 LYXERR0("Solitary \\end_layout in line " << lex.getLineNo() << "\n"
 135                        << "Missing \\begin_layout ?");
 136         } else if (token == "\\end_inset") {
 137                 LYXERR0("Solitary \\end_inset in line " << lex.getLineNo() << "\n"
 138                        << "Missing \\begin_inset ?");
 139         } else if (token == "\\begin_inset") {
 140                 Inset * inset = readInset(lex, buf);
 141                 if (inset)
 142                         par.insertInset(par.size(), inset, font, change);
 143                 else {
 144                         lex.eatLine();
 145                         docstring line = lex.getDocString();
 146                         errorList.push_back(ErrorItem(_("Unknown Inset"), line,
 147                                             par.id(), 0, par.size()));
 148                 }
 149         } else if (token == "\\family") {
 150                 lex.next();
 151                 setLyXFamily(lex.getString(), font.fontInfo());
 152         } else if (token == "\\series") {
 153                 lex.next();
 154                 setLyXSeries(lex.getString(), font.fontInfo());
 155         } else if (token == "\\shape") {
 156                 lex.next();
 157                 setLyXShape(lex.getString(), font.fontInfo());
 158         } else if (token == "\\size") {
 159                 lex.next();
 160                 setLyXSize(lex.getString(), font.fontInfo());
 161         } else if (token == "\\lang") {
 162                 lex.next();
 163                 string const tok = lex.getString();
 164                 Language const * lang = languages.getLanguage(tok);
 165                 if (lang) {
 166                         font.setLanguage(lang);
 167                 } else {
 168                         font.setLanguage(bp.language);
 169                         lex.printError("Unknown language `$$Token'");
 170                 }
 171         } else if (token == "\\numeric") {
 172                 lex.next();
 173                 font.fontInfo().setNumber(font.setLyXMisc(lex.getString()));
 174         } else if (token == "\\emph") {
 175                 lex.next();
 176                 font.fontInfo().setEmph(font.setLyXMisc(lex.getString()));
 177         } else if (token == "\\bar") {
 178                 lex.next();
 179                 string const tok = lex.getString();
 180
 181                 if (tok == "under")
 182                         font.fontInfo().setUnderbar(FONT_ON);
 183                 else if (tok == "no")
 184                         font.fontInfo().setUnderbar(FONT_OFF);
 185                 else if (tok == "default")
 186                         font.fontInfo().setUnderbar(FONT_INHERIT);
 187                 else
 188                         lex.printError("Unknown bar font flag "
 189                                        "`$$Token'");
 190         } else if (token == "\\noun") {
 191                 lex.next();
 192                 font.fontInfo().setNoun(font.setLyXMisc(lex.getString()));
 193         } else if (token == "\\color") {
 194                 lex.next();
 195                 setLyXColor(lex.getString(), font.fontInfo());
 196         } else if (token == "\\InsetSpace" || token == "\\SpecialChar") {
 197
 198                 // Insets don't make sense in a free-spacing context! ---Kayvan
 199                 if (par.isFreeSpacing()) {
 200                         if (token == "\\InsetSpace")
 201                                 par.appendChar(' ', font, change);
 202                         else if (lex.isOK()) {
 203                                 lex.next();
 204                                 string const next_token = lex.getString();
 205                                 if (next_token == "\\-")
 206                                         par.appendChar('-', font, change);
 207                                 else {
 208                                         lex.printError("Token `$$Token' "
 209                                                        "is in free space "
 210                                                        "paragraph layout!");
 211                                 }
 212                         }
 213                 } else {
 214                         auto_ptr<Inset> inset;
 215                         if (token == "\\SpecialChar" )
 216                                 inset.reset(new InsetSpecialChar);
 217                         else
 218                                 inset.reset(new InsetSpace);
 219                         inset->read(buf, lex);
 220                         par.insertInset(par.size(), inset.release(),
 221                                         font, change);
 222                 }
 223         } else if (token == "\\backslash") {
 224                 par.appendChar('\\', font, change);
 225         } else if (token == "\\linebreak") {
 226                 auto_ptr<Inset> inset(new InsetLinebreak);
 227                 inset->read(buf, lex);
 228                 par.insertInset(par.size(), inset.release(), font, change);
 229         } else if (token == "\\newline") {
 230                 auto_ptr<Inset> inset(new InsetNewline);
 231                 inset->read(buf, lex);
 232                 par.insertInset(par.size(), inset.release(), font, change);
 233         } else if (token == "\\LyXTable") {
 234                 auto_ptr<Inset> inset(new InsetTabular(buf));
 235                 inset->read(buf, lex);
 236                 par.insertInset(par.size(), inset.release(), font, change);
 237         } else if (token == "\\hfill") {
 238                 par.insertInset(par.size(), new InsetHFill, font, change);
 239         } else if (token == "\\lyxline") {
 240                 par.insertInset(par.size(), new InsetLine, font, change);
 241         } else if (token == "\\newpage") {
 242                 par.insertInset(par.size(), new InsetNewpage, font, change);
 243         } else if (token == "\\pagebreak") {
 244                 par.insertInset(par.size(), new InsetPagebreak, font, change);
 245         } else if (token == "\\clearpage") {
 246                 par.insertInset(par.size(), new InsetClearPage, font, change);
 247         } else if (token == "\\cleardoublepage") {
 248                 par.insertInset(par.size(), new InsetClearDoublePage, font, change);
 249         } else if (token == "\\change_unchanged") {
 250                 change = Change(Change::UNCHANGED);
 251         } else if (token == "\\change_inserted") {
 252                 lex.eatLine();
 253                 std::istringstream is(lex.getString());
 254                 unsigned int aid;
 255                 time_t ct;
 256                 is >> aid >> ct;
 257                 if (aid >= bp.author_map.size()) {
 258                         errorList.push_back(ErrorItem(_("Change tracking error"),
 259                                             bformat(_("Unknown author index for insertion: %1$d\n"), aid),
 260                                             par.id(), 0, par.size()));
 261                         change = Change(Change::UNCHANGED);
 262                 } else
 263                         change = Change(Change::INSERTED, bp.author_map[aid], ct);
 264         } else if (token == "\\change_deleted") {
 265                 lex.eatLine();
 266                 std::istringstream is(lex.getString());
 267                 unsigned int aid;
 268                 time_t ct;
 269                 is >> aid >> ct;
 270                 if (aid >= bp.author_map.size()) {
 271                         errorList.push_back(ErrorItem(_("Change tracking error"),
 272                                             bformat(_("Unknown author index for deletion: %1$d\n"), aid),
 273                                             par.id(), 0, par.size()));
 274                         change = Change(Change::UNCHANGED);
 275                 } else
 276                         change = Change(Change::DELETED, bp.author_map[aid], ct);
 277         } else {
 278                 lex.eatLine();
 279                 errorList.push_back(ErrorItem(_("Unknown token"),
 280                         bformat(_("Unknown token: %1$s %2$s\n"), from_utf8(token),
 281                         lex.getDocString()),
 282                         par.id(), 0, par.size()));
 283         }
 284 }
 285
 286
 287 void readParagraph(Buffer const & buf, Paragraph & par, Lexer & lex,
 288         ErrorList & errorList)
 289 {
 290         lex.nextToken();
 291         string token = lex.getString();
 292         Font font;
 293         Change change(Change::UNCHANGED);
 294
 295         while (lex.isOK()) {
 296                 readParToken(buf, par, lex, token, font, change, errorList);
 297
 298                 lex.nextToken();
 299                 token = lex.getString();
 300
 301                 if (token.empty())
 302                         continue;
 303
 304                 if (token == "\\end_layout") {
 305                         //Ok, paragraph finished
 306                         break;
 307                 }
 308
 309                 LYXERR(Debug::PARSER, "Handling paragraph token: `" << token << '\'');
 310                 if (token == "\\begin_layout" || token == "\\end_document"
 311                     || token == "\\end_inset" || token == "\\begin_deeper"
 312                     || token == "\\end_deeper") {
 313                         lex.pushToken(token);
 314                         lyxerr << "Paragraph ended in line "
 315                                << lex.getLineNo() << "\n"
 316                                << "Missing \\end_layout.\n";
 317                         break;
 318                 }
 319         }
 320         // Final change goes to paragraph break:
 321         par.setChange(par.size(), change);
 322
 323         // Initialize begin_of_body_ on load; redoParagraph maintains
 324         par.setBeginOfBody();
 325 }
 326
 327
 328 } // namespace anon
 329
 330
 331 bool Text::empty() const
 332 {
 333         return pars_.empty() || (pars_.size() == 1 && pars_[0].empty()
 334                 // FIXME: Should we consider the labeled type as empty too?
 335                 && pars_[0].layout()->labeltype == LABEL_NO_LABEL);
 336 }
 337
 338
 339 double Text::spacing(Buffer const & buffer,
 340                 Paragraph const & par) const
 341 {
 342         if (par.params().spacing().isDefault())
 343                 return buffer.params().spacing().getValue();
 344         return par.params().spacing().getValue();
 345 }
 346
 347
 348 void Text::breakParagraph(Cursor & cur, bool inverse_logic)
 349 {
 350         BOOST_ASSERT(this == cur.text());
 351
 352         Paragraph & cpar = cur.paragraph();
 353         pit_type cpit = cur.pit();
 354
 355         TextClass const & tclass = cur.buffer().params().getTextClass();
 356         LayoutPtr const & layout = cpar.layout();
 357
 358         // this is only allowed, if the current paragraph is not empty
 359         // or caption and if it has not the keepempty flag active
 360         if (cur.lastpos() == 0 && !cpar.allowEmpty() &&
 361             layout->labeltype != LABEL_SENSITIVE)
 362                 return;
 363
 364         // a layout change may affect also the following paragraph
 365         recUndo(cur, cur.pit(), undoSpan(cur.pit()) - 1);
 366
 367         // Always break behind a space
 368         // It is better to erase the space (Dekel)
 369         if (cur.pos() != cur.lastpos() && cpar.isLineSeparator(cur.pos()))
 370                 cpar.eraseChar(cur.pos(), cur.buffer().params().trackChanges);
 371
 372         // What should the layout for the new paragraph be?
 373         bool keep_layout = inverse_logic ?
 374                 !layout->isEnvironment()
 375                 : layout->isEnvironment();
 376
 377         // We need to remember this before we break the paragraph, because
 378         // that invalidates the layout variable
 379         bool sensitive = layout->labeltype == LABEL_SENSITIVE;
 380
 381         // we need to set this before we insert the paragraph.
 382         bool const isempty = cpar.allowEmpty() && cpar.empty();
 383
 384         lyx::breakParagraph(cur.buffer().params(), paragraphs(), cpit,
 385                          cur.pos(), keep_layout);
 386
 387         // After this, neither paragraph contains any rows!
 388
 389         cpit = cur.pit();
 390         pit_type next_par = cpit + 1;
 391
 392         // well this is the caption hack since one caption is really enough
 393         if (sensitive) {
 394                 if (cur.pos() == 0)
 395                         // set to standard-layout
 396                         pars_[cpit].applyLayout(tclass.defaultLayout());
 397                 else
 398                         // set to standard-layout
 399                         pars_[next_par].applyLayout(tclass.defaultLayout());
 400         }
 401
 402         while (!pars_[next_par].empty() && pars_[next_par].isNewline(0)) {
 403                 if (!pars_[next_par].eraseChar(0, cur.buffer().params().trackChanges))
 404                         break; // the character couldn't be deleted physically due to change tracking
 405         }
 406
 407         updateLabels(cur.buffer());
 408
 409         // A singlePar update is not enough in this case.
 410         cur.updateFlags(Update::Force);
 411
 412         // This check is necessary. Otherwise the new empty paragraph will
 413         // be deleted automatically. And it is more friendly for the user!
 414         if (cur.pos() != 0 || isempty)
 415                 setCursor(cur, cur.pit() + 1, 0);
 416         else
 417                 setCursor(cur, cur.pit(), 0);
 418 }
 419
 420
 421 // insert a character, moves all the following breaks in the
 422 // same Paragraph one to the right and make a rebreak
 423 void Text::insertChar(Cursor & cur, char_type c)
 424 {
 425         BOOST_ASSERT(this == cur.text());
 426
 427         cur.recordUndo(INSERT_UNDO);
 428
 429         TextMetrics const & tm = cur.bv().textMetrics(this);
 430         Buffer const & buffer = cur.buffer();
 431         Paragraph & par = cur.paragraph();
 432         // try to remove this
 433         pit_type const pit = cur.pit();
 434
 435         bool const freeSpacing = par.layout()->free_spacing ||
 436                 par.isFreeSpacing();
 437
 438         if (lyxrc.auto_number) {
 439                 static docstring const number_operators = from_ascii("+-/*");
 440                 static docstring const number_unary_operators = from_ascii("+-");
 441                 static docstring const number_seperators = from_ascii(".,:");
 442
 443                 if (cur.current_font.fontInfo().number() == FONT_ON) {
 444                         if (!isDigit(c) && !contains(number_operators, c) &&
 445                             !(contains(number_seperators, c) &&
 446                               cur.pos() != 0 &&
 447                               cur.pos() != cur.lastpos() &&
 448                               tm.getDisplayFont(pit, cur.pos()).fontInfo().number() == FONT_ON &&
 449                               tm.getDisplayFont(pit, cur.pos() - 1).fontInfo().number() == FONT_ON)
 450                            )
 451                                 number(cur); // Set current_font.number to OFF
 452                 } else if (isDigit(c) &&
 453                            cur.real_current_font.isVisibleRightToLeft()) {
 454                         number(cur); // Set current_font.number to ON
 455
 456                         if (cur.pos() != 0) {
 457                                 char_type const c = par.getChar(cur.pos() - 1);
 458                                 if (contains(number_unary_operators, c) &&
 459                                     (cur.pos() == 1
 460                                      || par.isSeparator(cur.pos() - 2)
 461                                      || par.isNewline(cur.pos() - 2))
 462                                   ) {
 463                                         setCharFont(buffer, pit, cur.pos() - 1, cur.current_font,
 464                                                 tm.font_);
 465                                 } else if (contains(number_seperators, c)
 466                                      && cur.pos() >= 2
 467                                      && tm.getDisplayFont(pit, cur.pos() - 2).fontInfo().number() == FONT_ON) {
 468                                         setCharFont(buffer, pit, cur.pos() - 1, cur.current_font,
 469                                                 tm.font_);
 470                                 }
 471                         }
 472                 }
 473         }
 474
 475         // In Bidi text, we want spaces to be treated in a special way: spaces
 476         // which are between words in different languages should get the
 477         // paragraph's language; otherwise, spaces should keep the language
 478         // they were originally typed in. This is only in effect while typing;
 479         // after the text is already typed in, the user can always go back and
 480         // explicitly set the language of a space as desired. But 99.9% of the
 481         // time, what we're doing here is what the user actually meant.
 482         //
 483         // The following cases are the ones in which the language of the space
 484         // should be changed to match that of the containing paragraph. In the
 485         // depictions, lowercase is LTR, uppercase is RTL, underscore (_)
 486         // represents a space, pipe (|) represents the cursor position (so the
 487         // character before it is the one just typed in). The different cases
 488         // are depicted logically (not visually), from left to right:
 489         //
 490         // 1. A_a|
 491         // 2. a_A|
 492         //
 493         // Theoretically, there are other situations that we should, perhaps, deal
 494         // with (e.g.: a|_A, A|_a). In practice, though, there really isn't any
 495         // point (to understand why, just try to create this situation...).
 496
 497         if ((cur.pos() >= 2) && (par.isLineSeparator(cur.pos() - 1))) {
 498                 // get font in front and behind the space in question. But do NOT
 499                 // use getFont(cur.pos()) because the character c is not inserted yet
 500                 Font const pre_space_font  = tm.getDisplayFont(cur.pit(), cur.pos() - 2);
 501                 Font const & post_space_font = cur.real_current_font;
 502                 bool pre_space_rtl  = pre_space_font.isVisibleRightToLeft();
 503                 bool post_space_rtl = post_space_font.isVisibleRightToLeft();
 504
 505                 if (pre_space_rtl != post_space_rtl) {
 506                         // Set the space's language to match the language of the
 507                         // adjacent character whose direction is the paragraph's
 508                         // direction; don't touch other properties of the font
 509                         Language const * lang =
 510                                 (pre_space_rtl == par.isRTL(buffer.params())) ?
 511                                 pre_space_font.language() : post_space_font.language();
 512
 513                         Font space_font = tm.getDisplayFont(cur.pit(), cur.pos() - 1);
 514                         space_font.setLanguage(lang);
 515                         par.setFont(cur.pos() - 1, space_font);
 516                 }
 517         }
 518
 519         // Next check, if there will be two blanks together or a blank at
 520         // the beginning of a paragraph.
 521         // I decided to handle blanks like normal characters, the main
 522         // difference are the special checks when calculating the row.fill
 523         // (blank does not count at the end of a row) and the check here
 524
 525         // When the free-spacing option is set for the current layout,
 526         // disable the double-space checking
 527         if (!freeSpacing && isLineSeparatorChar(c)) {
 528                 if (cur.pos() == 0) {
 529                         static bool sent_space_message = false;
 530                         if (!sent_space_message) {
 531                                 cur.message(_("You cannot insert a space at the "
 532                                                            "beginning of a paragraph. Please read the Tutorial."));
 533                                 sent_space_message = true;
 534                         }
 535                         return;
 536                 }
 537                 BOOST_ASSERT(cur.pos() > 0);
 538                 if ((par.isLineSeparator(cur.pos() - 1) || par.isNewline(cur.pos() - 1))
 539                     && !par.isDeleted(cur.pos() - 1)) {
 540                         static bool sent_space_message = false;
 541                         if (!sent_space_message) {
 542                                 cur.message(_("You cannot type two spaces this way. "
 543                                                            "Please read the Tutorial."));
 544                                 sent_space_message = true;
 545                         }
 546                         return;
 547                 }
 548         }
 549
 550         par.insertChar(cur.pos(), c, cur.current_font, cur.buffer().params().trackChanges);
 551         checkBufferStructure(cur.buffer(), cur);
 552
 553 //              cur.updateFlags(Update::Force);
 554         setCursor(cur.top(), cur.pit(), cur.pos() + 1);
 555         charInserted(cur);
 556 }
 557
 558
 559 void Text::charInserted(Cursor & cur)
 560 {
 561         // Here we call finishUndo for every 20 characters inserted.
 562         // This is from my experience how emacs does it. (Lgb)
 563         static unsigned int counter;
 564         if (counter < 20) {
 565                 ++counter;
 566         } else {
 567                 cur.finishUndo();
 568                 counter = 0;
 569         }
 570 }
 571
 572
 573 // the cursor set functions have a special mechanism. When they
 574 // realize, that you left an empty paragraph, they will delete it.
 575
 576 bool Text::cursorForwardOneWord(Cursor & cur)
 577 {
 578         BOOST_ASSERT(this == cur.text());
 579
 580         Cursor old = cur;
 581
 582         if (old.pos() == old.lastpos() && old.pit() != old.lastpit()) {
 583                 ++old.pit();
 584                 old.pos() = 0;
 585         } else {
 586                 // Advance through word.
 587                 while (old.pos() != old.lastpos() && old.paragraph().isLetter(old.pos()))
 588                         ++old.pos();
 589                 // Skip through trailing nonword stuff.
 590                 while (old.pos() != old.lastpos() && !old.paragraph().isLetter(old.pos()))
 591                         ++old.pos();
 592         }
 593         return setCursor(cur, old.pit(), old.pos());
 594 }
 595
 596
 597 bool Text::cursorBackwardOneWord(Cursor & cur)
 598 {
 599         BOOST_ASSERT(this == cur.text());
 600
 601         Cursor old = cur;
 602
 603         if (old.pos() == 0 && old.pit() != 0) {
 604                 --old.pit();
 605                 old.pos() = old.lastpos();
 606         } else {
 607                 // Skip through initial nonword stuff.
 608                 while (old.pos() != 0 && !old.paragraph().isLetter(old.pos() - 1))
 609                         --old.pos();
 610                 // Advance through word.
 611                 while (old.pos() != 0 && old.paragraph().isLetter(old.pos() - 1))
 612                         --old.pos();
 613         }
 614         return setCursor(cur, old.pit(), old.pos());
 615 }
 616
 617
 618 void Text::selectWord(Cursor & cur, word_location loc)
 619 {
 620         BOOST_ASSERT(this == cur.text());
 621         CursorSlice from = cur.top();
 622         CursorSlice to = cur.top();
 623         getWord(from, to, loc);
 624         if (cur.top() != from)
 625                 setCursor(cur, from.pit(), from.pos());
 626         if (to == from)
 627                 return;
 628         cur.resetAnchor();
 629         setCursor(cur, to.pit(), to.pos());
 630         cur.setSelection();
 631 }
 632
 633
 634 // Select the word currently under the cursor when no
 635 // selection is currently set
 636 bool Text::selectWordWhenUnderCursor(Cursor & cur, word_location loc)
 637 {
 638         BOOST_ASSERT(this == cur.text());
 639         if (cur.selection())
 640                 return false;
 641         selectWord(cur, loc);
 642         return cur.selection();
 643 }
 644
 645
 646 void Text::acceptOrRejectChanges(Cursor & cur, ChangeOp op)
 647 {
 648         BOOST_ASSERT(this == cur.text());
 649
 650         if (!cur.selection())
 651                 return;
 652
 653         cur.recordUndoSelection();
 654
 655         pit_type begPit = cur.selectionBegin().pit();
 656         pit_type endPit = cur.selectionEnd().pit();
 657
 658         pos_type begPos = cur.selectionBegin().pos();
 659         pos_type endPos = cur.selectionEnd().pos();
 660
 661         // keep selection info, because endPos becomes invalid after the first loop
 662         bool endsBeforeEndOfPar = (endPos < pars_[endPit].size());
 663
 664         // first, accept/reject changes within each individual paragraph (do not consider end-of-par)
 665
 666         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 667                 pos_type parSize = pars_[pit].size();
 668
 669                 // ignore empty paragraphs; otherwise, an assertion will fail for
 670                 // acceptChanges(bparams, 0, 0) or rejectChanges(bparams, 0, 0)
 671                 if (parSize == 0)
 672                         continue;
 673
 674                 // do not consider first paragraph if the cursor starts at pos size()
 675                 if (pit == begPit && begPos == parSize)
 676                         continue;
 677
 678                 // do not consider last paragraph if the cursor ends at pos 0
 679                 if (pit == endPit && endPos == 0)
 680                         break; // last iteration anyway
 681
 682                 pos_type left  = (pit == begPit ? begPos : 0);
 683                 pos_type right = (pit == endPit ? endPos : parSize);
 684
 685                 if (op == ACCEPT) {
 686                         pars_[pit].acceptChanges(cur.buffer().params(), left, right);
 687                 } else {
 688                         pars_[pit].rejectChanges(cur.buffer().params(), left, right);
 689                 }
 690         }
 691
 692         // next, accept/reject imaginary end-of-par characters
 693
 694         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 695                 pos_type pos = pars_[pit].size();
 696
 697                 // skip if the selection ends before the end-of-par
 698                 if (pit == endPit && endsBeforeEndOfPar)
 699                         break; // last iteration anyway
 700
 701                 // skip if this is not the last paragraph of the document
 702                 // note: the user should be able to accept/reject the par break of the last par!
 703                 if (pit == endPit && pit + 1 != int(pars_.size()))
 704                         break; // last iteration anway
 705
 706                 if (op == ACCEPT) {
 707                         if (pars_[pit].isInserted(pos)) {
 708                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 709                         } else if (pars_[pit].isDeleted(pos)) {
 710                                 if (pit + 1 == int(pars_.size())) {
 711                                         // we cannot remove a par break at the end of the last paragraph;
 712                                         // instead, we mark it unchanged
 713                                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 714                                 } else {
 715                                         mergeParagraph(cur.buffer().params(), pars_, pit);
 716                                         --endPit;
 717                                         --pit;
 718                                 }
 719                         }
 720                 } else {
 721                         if (pars_[pit].isDeleted(pos)) {
 722                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 723                         } else if (pars_[pit].isInserted(pos)) {
 724                                 if (pit + 1 == int(pars_.size())) {
 725                                         // we mark the par break at the end of the last paragraph unchanged
 726                                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 727                                 } else {
 728                                         mergeParagraph(cur.buffer().params(), pars_, pit);
 729                                         --endPit;
 730                                         --pit;
 731                                 }
 732                         }
 733                 }
 734         }
 735
 736         // finally, invoke the DEPM
 737
 738         deleteEmptyParagraphMechanism(begPit, endPit, cur.buffer().params().trackChanges);
 739
 740         //
 741
 742         cur.finishUndo();
 743         cur.clearSelection();
 744         setCursorIntern(cur, begPit, begPos);
 745         cur.updateFlags(Update::Force);
 746         updateLabels(cur.buffer());
 747 }
 748
 749
 750 void Text::acceptChanges(BufferParams const & bparams)
 751 {
 752         lyx::acceptChanges(pars_, bparams);
 753         deleteEmptyParagraphMechanism(0, pars_.size() - 1, bparams.trackChanges);
 754 }
 755
 756
 757 void Text::rejectChanges(BufferParams const & bparams)
 758 {
 759         pit_type pars_size = static_cast<pit_type>(pars_.size());
 760
 761         // first, reject changes within each individual paragraph
 762         // (do not consider end-of-par)
 763         for (pit_type pit = 0; pit < pars_size; ++pit) {
 764                 if (!pars_[pit].empty())   // prevent assertion failure
 765                         pars_[pit].rejectChanges(bparams, 0, pars_[pit].size());
 766         }
 767
 768         // next, reject imaginary end-of-par characters
 769         for (pit_type pit = 0; pit < pars_size; ++pit) {
 770                 pos_type pos = pars_[pit].size();
 771
 772                 if (pars_[pit].isDeleted(pos)) {
 773                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 774                 } else if (pars_[pit].isInserted(pos)) {
 775                         if (pit == pars_size - 1) {
 776                                 // we mark the par break at the end of the last
 777                                 // paragraph unchanged
 778                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 779                         } else {
 780                                 mergeParagraph(bparams, pars_, pit);
 781                                 --pit;
 782                                 --pars_size;
 783                         }
 784                 }
 785         }
 786
 787         // finally, invoke the DEPM
 788         deleteEmptyParagraphMechanism(0, pars_size - 1, bparams.trackChanges);
 789 }
 790
 791
 792 void Text::deleteWordForward(Cursor & cur)
 793 {
 794         BOOST_ASSERT(this == cur.text());
 795         if (cur.lastpos() == 0)
 796                 cursorForward(cur);
 797         else {
 798                 cur.resetAnchor();
 799                 cur.selection() = true;
 800                 cursorForwardOneWord(cur);
 801                 cur.setSelection();
 802                 cutSelection(cur, true, false);
 803                 checkBufferStructure(cur.buffer(), cur);
 804         }
 805 }
 806
 807
 808 void Text::deleteWordBackward(Cursor & cur)
 809 {
 810         BOOST_ASSERT(this == cur.text());
 811         if (cur.lastpos() == 0)
 812                 cursorBackward(cur);
 813         else {
 814                 cur.resetAnchor();
 815                 cur.selection() = true;
 816                 cursorBackwardOneWord(cur);
 817                 cur.setSelection();
 818                 cutSelection(cur, true, false);
 819                 checkBufferStructure(cur.buffer(), cur);
 820         }
 821 }
 822
 823
 824 // Kill to end of line.
 825 void Text::changeCase(Cursor & cur, TextCase action)
 826 {
 827         BOOST_ASSERT(this == cur.text());
 828         CursorSlice from;
 829         CursorSlice to;
 830
 831         if (cur.selection()) {
 832                 from = cur.selBegin();
 833                 to = cur.selEnd();
 834         } else {
 835                 from = cur.top();
 836                 getWord(from, to, PARTIAL_WORD);
 837                 cursorForwardOneWord(cur);
 838         }
 839
 840         cur.recordUndoSelection();
 841
 842         pit_type begPit = from.pit();
 843         pit_type endPit = to.pit();
 844
 845         pos_type begPos = from.pos();
 846         pos_type endPos = to.pos();
 847
 848         pos_type right = 0; // needed after the for loop
 849
 850         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 851                 Paragraph & par = pars_[pit];
 852                 pos_type const pos = (pit == begPit ? begPos : 0);
 853                 right = (pit == endPit ? endPos : par.size());
 854                 par.changeCase(cur.buffer().params(), pos, right, action);
 855         }
 856
 857         // the selection may have changed due to logically-only deleted chars
 858         setCursor(cur, begPit, begPos);
 859         cur.resetAnchor();
 860         setCursor(cur, endPit, right);
 861         cur.setSelection();
 862
 863         checkBufferStructure(cur.buffer(), cur);
 864 }
 865
 866
 867 bool Text::handleBibitems(Cursor & cur)
 868 {
 869         if (cur.paragraph().layout()->labeltype != LABEL_BIBLIO)
 870                 return false;
 871         // if a bibitem is deleted, merge with previous paragraph
 872         // if this is a bibliography item as well
 873         if (cur.pos() == 0) {
 874                 BufferParams const & bufparams = cur.buffer().params();
 875                 Paragraph const & par = cur.paragraph();
 876                 Cursor prevcur = cur;
 877                 if (cur.pit() > 0) {
 878                         --prevcur.pit();
 879                         prevcur.pos() = prevcur.lastpos();
 880                 }
 881                 Paragraph const & prevpar = prevcur.paragraph();
 882                 if (cur.pit() > 0 && par.layout() == prevpar.layout()) {
 883                         cur.recordUndo(ATOMIC_UNDO, prevcur.pit());
 884                         mergeParagraph(bufparams, cur.text()->paragraphs(),
 885                                        prevcur.pit());
 886                         updateLabels(cur.buffer());
 887                         setCursorIntern(cur, prevcur.pit(), prevcur.pos());
 888                         cur.updateFlags(Update::Force);
 889                 // if not, reset the paragraph to default
 890                 } else
 891                         cur.paragraph().layout(
 892                                 bufparams.getTextClass().defaultLayout());
 893                 return true;
 894         }
 895         return false;
 896 }
 897
 898
 899 bool Text::erase(Cursor & cur)
 900 {
 901         BOOST_ASSERT(this == cur.text());
 902         bool needsUpdate = false;
 903         Paragraph & par = cur.paragraph();
 904
 905         if (cur.pos() != cur.lastpos()) {
 906                 // this is the code for a normal delete, not pasting
 907                 // any paragraphs
 908                 cur.recordUndo(DELETE_UNDO);
 909                 if(!par.eraseChar(cur.pos(), cur.buffer().params().trackChanges)) {
 910                         // the character has been logically deleted only => skip it
 911                         cur.top().forwardPos();
 912                 }
 913                 checkBufferStructure(cur.buffer(), cur);
 914                 needsUpdate = true;
 915         } else {
 916                 if (cur.pit() == cur.lastpit())
 917                         return dissolveInset(cur);
 918
 919                 if (!par.isMergedOnEndOfParDeletion(cur.buffer().params().trackChanges)) {
 920                         par.setChange(cur.pos(), Change(Change::DELETED));
 921                         cur.forwardPos();
 922                         needsUpdate = true;
 923                 } else {
 924                         setCursorIntern(cur, cur.pit() + 1, 0);
 925                         needsUpdate = backspacePos0(cur);
 926                 }
 927         }
 928
 929         needsUpdate |= handleBibitems(cur);
 930
 931         if (needsUpdate) {
 932                 // Make sure the cursor is correct. Is this really needed?
 933                 // No, not really... at least not here!
 934                 cur.text()->setCursor(cur.top(), cur.pit(), cur.pos());
 935                 checkBufferStructure(cur.buffer(), cur);
 936         }
 937
 938         return needsUpdate;
 939 }
 940
 941
 942 bool Text::backspacePos0(Cursor & cur)
 943 {
 944         BOOST_ASSERT(this == cur.text());
 945         if (cur.pit() == 0)
 946                 return false;
 947
 948         bool needsUpdate = false;
 949
 950         BufferParams const & bufparams = cur.buffer().params();
 951         TextClass const & tclass = bufparams.getTextClass();
 952         ParagraphList & plist = cur.text()->paragraphs();
 953         Paragraph const & par = cur.paragraph();
 954         Cursor prevcur = cur;
 955         --prevcur.pit();
 956         prevcur.pos() = prevcur.lastpos();
 957         Paragraph const & prevpar = prevcur.paragraph();
 958
 959         // is it an empty paragraph?
 960         if (cur.lastpos() == 0
 961             || (cur.lastpos() == 1 && par.isSeparator(0))) {
 962                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit(), cur.pit());
 963                 plist.erase(boost::next(plist.begin(), cur.pit()));
 964                 needsUpdate = true;
 965         }
 966         // is previous par empty?
 967         else if (prevcur.lastpos() == 0
 968                  || (prevcur.lastpos() == 1 && prevpar.isSeparator(0))) {
 969                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit(), cur.pit());
 970                 plist.erase(boost::next(plist.begin(), prevcur.pit()));
 971                 needsUpdate = true;
 972         }
 973         // Pasting is not allowed, if the paragraphs have different
 974         // layouts. I think it is a real bug of all other
 975         // word processors to allow it. It confuses the user.
 976         // Correction: Pasting is always allowed with standard-layout
 977         else if (par.layout() == prevpar.layout()
 978                  || par.layout() == tclass.defaultLayout()) {
 979                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit());
 980                 mergeParagraph(bufparams, plist, prevcur.pit());
 981                 needsUpdate = true;
 982         }
 983
 984         if (needsUpdate) {
 985                 updateLabels(cur.buffer());
 986                 setCursorIntern(cur, prevcur.pit(), prevcur.pos());
 987         }
 988
 989         return needsUpdate;
 990 }
 991
 992
 993 bool Text::backspace(Cursor & cur)
 994 {
 995         BOOST_ASSERT(this == cur.text());
 996         bool needsUpdate = false;
 997         if (cur.pos() == 0) {
 998                 if (cur.pit() == 0)
 999                         return dissolveInset(cur);
1000
1001                 Paragraph & prev_par = pars_[cur.pit() - 1];
1002
1003                 if (!prev_par.isMergedOnEndOfParDeletion(cur.buffer().params().trackChanges)) {
1004                         prev_par.setChange(prev_par.size(), Change(Change::DELETED));
1005                         setCursorIntern(cur, cur.pit() - 1, prev_par.size());
1006                         return true;
1007                 }
1008                 // The cursor is at the beginning of a paragraph, so
1009                 // the backspace will collapse two paragraphs into one.
1010                 needsUpdate = backspacePos0(cur);
1011
1012         } else {
1013                 // this is the code for a normal backspace, not pasting
1014                 // any paragraphs
1015                 cur.recordUndo(DELETE_UNDO);
1016                 // We used to do cursorBackwardIntern() here, but it is
1017                 // not a good idea since it triggers the auto-delete
1018                 // mechanism. So we do a cursorBackwardIntern()-lite,
1019                 // without the dreaded mechanism. (JMarc)
1020                 setCursorIntern(cur, cur.pit(), cur.pos() - 1,
1021                                 false, cur.boundary());
1022                 cur.paragraph().eraseChar(cur.pos(), cur.buffer().params().trackChanges);
1023                 checkBufferStructure(cur.buffer(), cur);
1024         }
1025
1026         if (cur.pos() == cur.lastpos())
1027                 cur.setCurrentFont();
1028
1029         needsUpdate |= handleBibitems(cur);
1030
1031         // A singlePar update is not enough in this case.
1032 //              cur.updateFlags(Update::Force);
1033         setCursor(cur.top(), cur.pit(), cur.pos());
1034
1035         return needsUpdate;
1036 }
1037
1038
1039 bool Text::dissolveInset(Cursor & cur) {
1040         BOOST_ASSERT(this == cur.text());
1041
1042         if (isMainText(cur.bv().buffer()) || cur.inset().nargs() != 1)
1043                 return false;
1044
1045         cur.recordUndoInset();
1046         cur.selHandle(false);
1047         // save position
1048         pos_type spos = cur.pos();
1049         pit_type spit = cur.pit();
1050         ParagraphList plist;
1051         if (cur.lastpit() != 0 || cur.lastpos() != 0)
1052                 plist = paragraphs();
1053         cur.popBackward();
1054         // store cursor offset
1055         if (spit == 0)
1056                 spos += cur.pos();
1057         spit += cur.pit();
1058         Buffer & b = cur.buffer();
1059         cur.paragraph().eraseChar(cur.pos(), b.params().trackChanges);
1060         if (!plist.empty()) {
1061                 // ERT paragraphs have the Language latex_language.
1062                 // This is invalid outside of ERT, so we need to
1063                 // change it to the buffer language.
1064                 ParagraphList::iterator it = plist.begin();
1065                 ParagraphList::iterator it_end = plist.end();
1066                 for (; it != it_end; it++)
1067                         it->changeLanguage(b.params(), latex_language, b.language());
1068
1069                 pasteParagraphList(cur, plist, b.params().getTextClassPtr(),
1070                                    b.errorList("Paste"));
1071                 // restore position
1072                 cur.pit() = std::min(cur.lastpit(), spit);
1073                 cur.pos() = std::min(cur.lastpos(), spos);
1074         }
1075         cur.clearSelection();
1076         cur.resetAnchor();
1077         return true;
1078 }
1079
1080
1081 void Text::getWord(CursorSlice & from, CursorSlice & to,
1082         word_location const loc)
1083 {
1084         Paragraph const & from_par = pars_[from.pit()];
1085         switch (loc) {
1086         case WHOLE_WORD_STRICT:
1087                 if (from.pos() == 0 || from.pos() == from_par.size()
1088                     || !from_par.isLetter(from.pos())
1089                     || !from_par.isLetter(from.pos() - 1)) {
1090                         to = from;
1091                         return;
1092                 }
1093                 // no break here, we go to the next
1094
1095         case WHOLE_WORD:
1096                 // If we are already at the beginning of a word, do nothing
1097                 if (!from.pos() || !from_par.isLetter(from.pos() - 1))
1098                         break;
1099                 // no break here, we go to the next
1100
1101         case PREVIOUS_WORD:
1102                 // always move the cursor to the beginning of previous word
1103                 while (from.pos() && from_par.isLetter(from.pos() - 1))
1104                         --from.pos();
1105                 break;
1106         case NEXT_WORD:
1107                 LYXERR0("Text::getWord: NEXT_WORD not implemented yet");
1108                 break;
1109         case PARTIAL_WORD:
1110                 // no need to move the 'from' cursor
1111                 break;
1112         }
1113         to = from;
1114         Paragraph & to_par = pars_[to.pit()];
1115         while (to.pos() < to_par.size() && to_par.isLetter(to.pos()))
1116                 ++to.pos();
1117 }
1118
1119
1120 void Text::write(Buffer const & buf, std::ostream & os) const
1121 {
1122         ParagraphList::const_iterator pit = paragraphs().begin();
1123         ParagraphList::const_iterator end = paragraphs().end();
1124         depth_type dth = 0;
1125         for (; pit != end; ++pit)
1126                 pit->write(buf, os, buf.params(), dth);
1127
1128         // Close begin_deeper
1129         for(; dth > 0; --dth)
1130                 os << "\n\\end_deeper";
1131 }
1132
1133
1134 bool Text::read(Buffer const & buf, Lexer & lex, ErrorList & errorList)
1135 {
1136         depth_type depth = 0;
1137
1138         while (lex.isOK()) {
1139                 lex.nextToken();
1140                 string const token = lex.getString();
1141
1142                 if (token.empty())
1143                         continue;
1144
1145                 if (token == "\\end_inset")
1146                         break;
1147
1148                 if (token == "\\end_body")
1149                         continue;
1150
1151                 if (token == "\\begin_body")
1152                         continue;
1153
1154                 if (token == "\\end_document")
1155                         return false;
1156
1157                 if (token == "\\begin_layout") {
1158                         lex.pushToken(token);
1159
1160                         Paragraph par;
1161                         par.params().depth(depth);
1162                         par.setFont(0, Font(inherit_font, buf.params().language));
1163                         pars_.push_back(par);
1164
1165                         // FIXME: goddamn InsetTabular makes us pass a Buffer
1166                         // not BufferParams
1167                         lyx::readParagraph(buf, pars_.back(), lex, errorList);
1168
1169                 } else if (token == "\\begin_deeper") {
1170                         ++depth;
1171                 } else if (token == "\\end_deeper") {
1172                         if (!depth)
1173                                 lex.printError("\\end_deeper: " "depth is already null");
1174                         else
1175                                 --depth;
1176                 } else {
1177                         LYXERR0("Handling unknown body token: `" << token << '\'');
1178                 }
1179         }
1180         return true;
1181 }
1182
1183 // Returns the current font and depth as a message.
1184 docstring Text::currentState(Cursor & cur)
1185 {
1186         BOOST_ASSERT(this == cur.text());
1187         Buffer & buf = cur.buffer();
1188         Paragraph const & par = cur.paragraph();
1189         odocstringstream os;
1190
1191         if (buf.params().trackChanges)
1192                 os << _("[Change Tracking] ");
1193
1194         Change change = par.lookupChange(cur.pos());
1195
1196         if (change.type != Change::UNCHANGED) {
1197                 Author const & a = buf.params().authors().get(change.author);
1198                 os << _("Change: ") << a.name();
1199                 if (!a.email().empty())
1200                         os << " (" << a.email() << ")";
1201                 // FIXME ctime is english, we should translate that
1202                 os << _(" at ") << ctime(&change.changetime);
1203                 os << " : ";
1204         }
1205
1206         // I think we should only show changes from the default
1207         // font. (Asger)
1208         // No, from the document font (MV)
1209         Font font = cur.real_current_font;
1210         font.fontInfo().reduce(buf.params().getFont().fontInfo());
1211
1212         os << bformat(_("Font: %1$s"), font.stateText(&buf.params()));
1213
1214         // The paragraph depth
1215         int depth = cur.paragraph().getDepth();
1216         if (depth > 0)
1217                 os << bformat(_(", Depth: %1$d"), depth);
1218
1219         // The paragraph spacing, but only if different from
1220         // buffer spacing.
1221         Spacing const & spacing = par.params().spacing();
1222         if (!spacing.isDefault()) {
1223                 os << _(", Spacing: ");
1224                 switch (spacing.getSpace()) {
1225                 case Spacing::Single:
1226                         os << _("Single");
1227                         break;
1228                 case Spacing::Onehalf:
1229                         os << _("OneHalf");
1230                         break;
1231                 case Spacing::Double:
1232                         os << _("Double");
1233                         break;
1234                 case Spacing::Other:
1235                         os << _("Other (") << from_ascii(spacing.getValueAsString()) << ')';
1236                         break;
1237                 case Spacing::Default:
1238                         // should never happen, do nothing
1239                         break;
1240                 }
1241         }
1242
1243 #ifdef DEVEL_VERSION
1244         os << _(", Inset: ") << &cur.inset();
1245         os << _(", Paragraph: ") << cur.pit();
1246         os << _(", Id: ") << par.id();
1247         os << _(", Position: ") << cur.pos();
1248         // FIXME: Why is the check for par.size() needed?
1249         // We are called with cur.pos() == par.size() quite often.
1250         if (!par.empty() && cur.pos() < par.size()) {
1251                 // Force output of code point, not character
1252                 size_t const c = par.getChar(cur.pos());
1253                 os << _(", Char: 0x") << std::hex << c;
1254         }
1255         os << _(", Boundary: ") << cur.boundary();
1256 //      Row & row = cur.textRow();
1257 //      os << bformat(_(", Row b:%1$d e:%2$d"), row.pos(), row.endpos());
1258 #endif
1259         return os.str();
1260 }
1261
1262
1263 docstring Text::getPossibleLabel(Cursor & cur) const
1264 {
1265         pit_type pit = cur.pit();
1266
1267         LayoutPtr layout = pars_[pit].layout();
1268
1269         docstring text;
1270         docstring par_text = pars_[pit].asString(cur.buffer(), false);
1271         string piece;
1272         // the return string of math matrices might contain linebreaks
1273         par_text = subst(par_text, '\n', '-');
1274         for (int i = 0; i < lyxrc.label_init_length; ++i) {
1275                 if (par_text.empty())
1276                         break;
1277                 docstring head;
1278                 par_text = split(par_text, head, ' ');
1279                 // Is it legal to use spaces in labels ?
1280                 if (i > 0)
1281                         text += '-';
1282                 text += head;
1283         }
1284
1285         // No need for a prefix if the user said so.
1286         if (lyxrc.label_init_length <= 0)
1287                 return text;
1288
1289         // Will contain the label type.
1290         docstring name;
1291
1292         // For section, subsection, etc...
1293         if (layout->latextype == LATEX_PARAGRAPH && pit != 0) {
1294                 LayoutPtr const & layout2 = pars_[pit - 1].layout();
1295                 if (layout2->latextype != LATEX_PARAGRAPH) {
1296                         --pit;
1297                         layout = layout2;
1298                 }
1299         }
1300         if (layout->latextype != LATEX_PARAGRAPH)
1301                 name = from_ascii(layout->latexname());
1302
1303         // for captions, we just take the caption type
1304         Inset * caption_inset = cur.innerInsetOfType(CAPTION_CODE);
1305         if (caption_inset)
1306                 name = from_ascii(static_cast<InsetCaption *>(caption_inset)->type());
1307
1308         // If none of the above worked, we'll see if we're inside various
1309         // types of insets and take our abbreviation from them.
1310         if (name.empty()) {
1311                 InsetCode const codes[] = {
1312                         FLOAT_CODE,
1313                         WRAP_CODE,
1314                         FOOT_CODE
1315                 };
1316                 for (unsigned int i = 0; i < (sizeof codes / sizeof codes[0]); ++i) {
1317                         Inset * float_inset = cur.innerInsetOfType(codes[i]);
1318                         if (float_inset) {
1319                                 name = float_inset->name();
1320                                 break;
1321                         }
1322                 }
1323         }
1324
1325         // Create a correct prefix for prettyref
1326         if (name == "theorem")
1327                 name = from_ascii("thm");
1328         else if (name == "Foot")
1329                 name = from_ascii("fn");
1330         else if (name == "listing")
1331                 name = from_ascii("lst");
1332
1333         if (!name.empty())
1334                 text = name.substr(0, 3) + ':' + text;
1335
1336         return text;
1337 }
1338
1339
1340 void Text::charsTranspose(Cursor & cur)
1341 {
1342         BOOST_ASSERT(this == cur.text());
1343
1344         pos_type pos = cur.pos();
1345
1346         // If cursor is at beginning or end of paragraph, do nothing.
1347         if (pos == cur.lastpos() || pos == 0)
1348                 return;
1349
1350         Paragraph & par = cur.paragraph();
1351
1352         // Get the positions of the characters to be transposed.
1353         pos_type pos1 = pos - 1;
1354         pos_type pos2 = pos;
1355
1356         // In change tracking mode, ignore deleted characters.
1357         while (pos2 < cur.lastpos() && par.isDeleted(pos2))
1358                 ++pos2;
1359         if (pos2 == cur.lastpos())
1360                 return;
1361
1362         while (pos1 >= 0 && par.isDeleted(pos1))
1363                 --pos1;
1364         if (pos1 < 0)
1365                 return;
1366
1367         // Don't do anything if one of the "characters" is not regular text.
1368         if (par.isInset(pos1) || par.isInset(pos2))
1369                 return;
1370
1371         // Store the characters to be transposed (including font information).
1372         char_type char1 = par.getChar(pos1);
1373         Font const font1 =
1374                 par.getFontSettings(cur.buffer().params(), pos1);
1375
1376         char_type char2 = par.getChar(pos2);
1377         Font const font2 =
1378                 par.getFontSettings(cur.buffer().params(), pos2);
1379
1380         // And finally, we are ready to perform the transposition.
1381         // Track the changes if Change Tracking is enabled.
1382         bool const trackChanges = cur.buffer().params().trackChanges;
1383
1384         cur.recordUndo();
1385
1386         par.eraseChar(pos2, trackChanges);
1387         par.eraseChar(pos1, trackChanges);
1388         par.insertChar(pos1, char2, font2, trackChanges);
1389         par.insertChar(pos2, char1, font1, trackChanges);
1390
1391         checkBufferStructure(cur.buffer(), cur);
1392
1393         // After the transposition, move cursor to after the transposition.
1394         setCursor(cur, cur.pit(), pos2);
1395         cur.forwardPos();
1396 }
1397
1398
1399 } // namespace lyx