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 125                 // Test whether the layout is obsolete.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