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 121                 // Test whether the layout is obsolete.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