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 "CompletionList.h"
  30 #include "Cursor.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 "Language.h"
  38 #include "Length.h"
  39 #include "Lexer.h"
  40 #include "LyXRC.h"
  41 #include "Paragraph.h"
  42 #include "paragraph_funcs.h"
  43 #include "ParagraphParameters.h"
  44 #include "ParIterator.h"
  45 #include "TextClass.h"
  46 #include "TextMetrics.h"
  47 #include "VSpace.h"
  48 #include "WordLangTuple.h"
  49 #include "WordList.h"
  50
  51 #include "insets/InsetText.h"
  52 #include "insets/InsetBibitem.h"
  53 #include "insets/InsetCaption.h"
  54 #include "insets/InsetLine.h"
  55 #include "insets/InsetNewline.h"
  56 #include "insets/InsetNewpage.h"
  57 #include "insets/InsetOptArg.h"
  58 #include "insets/InsetSpace.h"
  59 #include "insets/InsetSpecialChar.h"
  60 #include "insets/InsetTabular.h"
  61
  62 #include "support/assert.h"
  63 #include "support/convert.h"
  64 #include "support/debug.h"
  65 #include "support/docstream.h"
  66 #include "support/gettext.h"
  67 #include "support/lstrings.h"
  68 #include "support/textutils.h"
  69
  70 #include <boost/next_prior.hpp>
  71
  72 #include <sstream>
  73
  74 using namespace std;
  75 using namespace lyx::support;
  76
  77 namespace lyx {
  78
  79 using cap::cutSelection;
  80 using cap::pasteParagraphList;
  81
  82 namespace {
  83
  84 void readParToken(Buffer const & buf, Paragraph & par, Lexer & lex,
  85         string const & token, Font & font, Change & change, ErrorList & errorList)
  86 {
  87         BufferParams const & bp = buf.params();
  88
  89         if (token[0] != '\\') {
  90                 docstring dstr = lex.getDocString();
  91                 par.appendString(dstr, font, change);
  92
  93         } else if (token == "\\begin_layout") {
  94                 lex.eatLine();
  95                 docstring layoutname = lex.getDocString();
  96
  97                 font = Font(inherit_font, bp.language);
  98                 change = Change(Change::UNCHANGED);
  99
 100                 DocumentClass const & tclass = bp.documentClass();
 101
 102                 if (layoutname.empty())
 103                         layoutname = tclass.defaultLayoutName();
 104
 105                 if (par.forceEmptyLayout()) {
 106                         // in this case only the empty layout is allowed
 107                         layoutname = tclass.emptyLayoutName();
 108                 } else if (par.useEmptyLayout()) {
 109                         // in this case, default layout maps to empty layout
 110                         if (layoutname == tclass.defaultLayoutName())
 111                                 layoutname = tclass.emptyLayoutName();
 112                 } else {
 113                         // otherwise, the empty layout maps to the default
 114                         if (layoutname == tclass.emptyLayoutName())
 115                                 layoutname = tclass.defaultLayoutName();
 116                 }
 117
 118                 bool hasLayout = tclass.hasLayout(layoutname);
 119
 120                 if (!hasLayout) {
 121                         errorList.push_back(ErrorItem(_("Unknown layout"),
 122                         bformat(_("Layout '%1$s' does not exist in textclass '%2$s'\nTrying to use the default instead.\n"),
 123                         layoutname, from_utf8(tclass.name())), par.id(), 0, par.size()));
 124                         layoutname = par.useEmptyLayout() ?
 125                                         tclass.emptyLayoutName() :
 126                                         tclass.defaultLayoutName();
 127                 }
 128
 129                 par.setLayout(bp.documentClass()[layoutname]);
 130
 131                 // Test whether the layout is obsolete.
 132                 Layout const & layout = par.layout();
 133                 if (!layout.obsoleted_by().empty())
 134                         par.setLayout(bp.documentClass()[layout.obsoleted_by()]);
 135
 136                 par.params().read(lex);
 137
 138         } else if (token == "\\end_layout") {
 139                 LYXERR0("Solitary \\end_layout in line " << lex.lineNumber() << "\n"
 140                        << "Missing \\begin_layout ?");
 141         } else if (token == "\\end_inset") {
 142                 LYXERR0("Solitary \\end_inset in line " << lex.lineNumber() << "\n"
 143                        << "Missing \\begin_inset ?");
 144         } else if (token == "\\begin_inset") {
 145                 Inset * inset = readInset(lex, buf);
 146                 if (inset)
 147                         par.insertInset(par.size(), inset, font, change);
 148                 else {
 149                         lex.eatLine();
 150                         docstring line = lex.getDocString();
 151                         errorList.push_back(ErrorItem(_("Unknown Inset"), line,
 152                                             par.id(), 0, par.size()));
 153                 }
 154         } else if (token == "\\family") {
 155                 lex.next();
 156                 setLyXFamily(lex.getString(), font.fontInfo());
 157         } else if (token == "\\series") {
 158                 lex.next();
 159                 setLyXSeries(lex.getString(), font.fontInfo());
 160         } else if (token == "\\shape") {
 161                 lex.next();
 162                 setLyXShape(lex.getString(), font.fontInfo());
 163         } else if (token == "\\size") {
 164                 lex.next();
 165                 setLyXSize(lex.getString(), font.fontInfo());
 166         } else if (token == "\\lang") {
 167                 lex.next();
 168                 string const tok = lex.getString();
 169                 Language const * lang = languages.getLanguage(tok);
 170                 if (lang) {
 171                         font.setLanguage(lang);
 172                 } else {
 173                         font.setLanguage(bp.language);
 174                         lex.printError("Unknown language `$$Token'");
 175                 }
 176         } else if (token == "\\numeric") {
 177                 lex.next();
 178                 font.fontInfo().setNumber(font.setLyXMisc(lex.getString()));
 179         } else if (token == "\\emph") {
 180                 lex.next();
 181                 font.fontInfo().setEmph(font.setLyXMisc(lex.getString()));
 182         } else if (token == "\\bar") {
 183                 lex.next();
 184                 string const tok = lex.getString();
 185
 186                 if (tok == "under")
 187                         font.fontInfo().setUnderbar(FONT_ON);
 188                 else if (tok == "no")
 189                         font.fontInfo().setUnderbar(FONT_OFF);
 190                 else if (tok == "default")
 191                         font.fontInfo().setUnderbar(FONT_INHERIT);
 192                 else
 193                         lex.printError("Unknown bar font flag "
 194                                        "`$$Token'");
 195         } else if (token == "\\noun") {
 196                 lex.next();
 197                 font.fontInfo().setNoun(font.setLyXMisc(lex.getString()));
 198         } else if (token == "\\color") {
 199                 lex.next();
 200                 setLyXColor(lex.getString(), font.fontInfo());
 201         } else if (token == "\\SpecialChar") {
 202                         auto_ptr<Inset> inset;
 203                         inset.reset(new InsetSpecialChar);
 204                         inset->read(lex);
 205                         par.insertInset(par.size(), inset.release(),
 206                                         font, change);
 207         } else if (token == "\\backslash") {
 208                 par.appendChar('\\', font, change);
 209         } else if (token == "\\LyXTable") {
 210                 auto_ptr<Inset> inset(new InsetTabular(buf));
 211                 inset->read(lex);
 212                 par.insertInset(par.size(), inset.release(), font, change);
 213         } else if (token == "\\lyxline") {
 214                 par.insertInset(par.size(), new InsetLine, font, change);
 215         } else if (token == "\\change_unchanged") {
 216                 change = Change(Change::UNCHANGED);
 217         } else if (token == "\\change_inserted") {
 218                 lex.eatLine();
 219                 istringstream is(lex.getString());
 220                 unsigned int aid;
 221                 time_t ct;
 222                 is >> aid >> ct;
 223                 if (aid >= bp.author_map.size()) {
 224                         errorList.push_back(ErrorItem(_("Change tracking error"),
 225                                             bformat(_("Unknown author index for insertion: %1$d\n"), aid),
 226                                             par.id(), 0, par.size()));
 227                         change = Change(Change::UNCHANGED);
 228                 } else
 229                         change = Change(Change::INSERTED, bp.author_map[aid], ct);
 230         } else if (token == "\\change_deleted") {
 231                 lex.eatLine();
 232                 istringstream is(lex.getString());
 233                 unsigned int aid;
 234                 time_t ct;
 235                 is >> aid >> ct;
 236                 if (aid >= bp.author_map.size()) {
 237                         errorList.push_back(ErrorItem(_("Change tracking error"),
 238                                             bformat(_("Unknown author index for deletion: %1$d\n"), aid),
 239                                             par.id(), 0, par.size()));
 240                         change = Change(Change::UNCHANGED);
 241                 } else
 242                         change = Change(Change::DELETED, bp.author_map[aid], ct);
 243         } else {
 244                 lex.eatLine();
 245                 errorList.push_back(ErrorItem(_("Unknown token"),
 246                         bformat(_("Unknown token: %1$s %2$s\n"), from_utf8(token),
 247                         lex.getDocString()),
 248                         par.id(), 0, par.size()));
 249         }
 250 }
 251
 252
 253 void readParagraph(Buffer const & buf, Paragraph & par, Lexer & lex,
 254         ErrorList & errorList)
 255 {
 256         lex.nextToken();
 257         string token = lex.getString();
 258         Font font;
 259         Change change(Change::UNCHANGED);
 260
 261         while (lex.isOK()) {
 262                 readParToken(buf, par, lex, token, font, change, errorList);
 263
 264                 lex.nextToken();
 265                 token = lex.getString();
 266
 267                 if (token.empty())
 268                         continue;
 269
 270                 if (token == "\\end_layout") {
 271                         //Ok, paragraph finished
 272                         break;
 273                 }
 274
 275                 LYXERR(Debug::PARSER, "Handling paragraph token: `" << token << '\'');
 276                 if (token == "\\begin_layout" || token == "\\end_document"
 277                     || token == "\\end_inset" || token == "\\begin_deeper"
 278                     || token == "\\end_deeper") {
 279                         lex.pushToken(token);
 280                         lyxerr << "Paragraph ended in line "
 281                                << lex.lineNumber() << "\n"
 282                                << "Missing \\end_layout.\n";
 283                         break;
 284                 }
 285         }
 286         // Final change goes to paragraph break:
 287         par.setChange(par.size(), change);
 288
 289         // Initialize begin_of_body_ on load; redoParagraph maintains
 290         par.setBeginOfBody();
 291 }
 292
 293
 294 } // namespace anon
 295
 296 class TextCompletionList : public CompletionList
 297 {
 298 public:
 299         ///
 300         TextCompletionList(Cursor const & cur)
 301         : buf_(cur.buffer()), pos_(0) {}
 302         ///
 303         virtual ~TextCompletionList() {}
 304
 305         ///
 306         virtual bool sorted() const { return true; }
 307         ///
 308         virtual size_t size() const
 309         {
 310                 return theWordList().size();
 311         }
 312         ///
 313         virtual docstring const & data(size_t idx) const
 314         {
 315                 return theWordList().word(idx);
 316         }
 317
 318 private:
 319         ///
 320         Buffer const & buf_;
 321         ///
 322         size_t pos_;
 323 };
 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, Paragraph const & par) const
 335 {
 336         if (par.params().spacing().isDefault())
 337                 return buffer.params().spacing().getValue();
 338         return par.params().spacing().getValue();
 339 }
 340
 341
 342 void Text::breakParagraph(Cursor & cur, bool inverse_logic)
 343 {
 344         LASSERT(this == cur.text(), /**/);
 345
 346         Paragraph & cpar = cur.paragraph();
 347         pit_type cpit = cur.pit();
 348
 349         DocumentClass const & tclass = cur.buffer().params().documentClass();
 350         Layout const & layout = cpar.layout();
 351
 352         // this is only allowed, if the current paragraph is not empty
 353         // or caption and if it has not the keepempty flag active
 354         if (cur.lastpos() == 0 && !cpar.allowEmpty() &&
 355             layout.labeltype != LABEL_SENSITIVE)
 356                 return;
 357
 358         // a layout change may affect also the following paragraph
 359         recUndo(cur, cur.pit(), undoSpan(cur.pit()) - 1);
 360
 361         // Always break behind a space
 362         // It is better to erase the space (Dekel)
 363         if (cur.pos() != cur.lastpos() && cpar.isLineSeparator(cur.pos()))
 364                 cpar.eraseChar(cur.pos(), cur.buffer().params().trackChanges);
 365
 366         // What should the layout for the new paragraph be?
 367         bool keep_layout = inverse_logic ?
 368                 !layout.isEnvironment()
 369                 : layout.isEnvironment();
 370
 371         // We need to remember this before we break the paragraph, because
 372         // that invalidates the layout variable
 373         bool sensitive = layout.labeltype == LABEL_SENSITIVE;
 374
 375         // we need to set this before we insert the paragraph.
 376         bool const isempty = cpar.allowEmpty() && cpar.empty();
 377
 378         lyx::breakParagraph(cur.buffer().params(), paragraphs(), cpit,
 379                          cur.pos(), keep_layout);
 380
 381         // After this, neither paragraph contains any rows!
 382
 383         cpit = cur.pit();
 384         pit_type next_par = cpit + 1;
 385
 386         // well this is the caption hack since one caption is really enough
 387         if (sensitive) {
 388                 if (cur.pos() == 0)
 389                         // set to standard-layout
 390                 //FIXME Check if this should be emptyLayout() in some cases
 391                         pars_[cpit].applyLayout(tclass.defaultLayout());
 392                 else
 393                         // set to standard-layout
 394                         //FIXME Check if this should be emptyLayout() in some cases
 395                         pars_[next_par].applyLayout(tclass.defaultLayout());
 396         }
 397
 398         while (!pars_[next_par].empty() && pars_[next_par].isNewline(0)) {
 399                 if (!pars_[next_par].eraseChar(0, cur.buffer().params().trackChanges))
 400                         break; // the character couldn't be deleted physically due to change tracking
 401         }
 402
 403         updateLabels(cur.buffer());
 404
 405         // A singlePar update is not enough in this case.
 406         cur.updateFlags(Update::Force);
 407
 408         // This check is necessary. Otherwise the new empty paragraph will
 409         // be deleted automatically. And it is more friendly for the user!
 410         if (cur.pos() != 0 || isempty)
 411                 setCursor(cur, cur.pit() + 1, 0);
 412         else
 413                 setCursor(cur, cur.pit(), 0);
 414 }
 415
 416
 417 // insert a character, moves all the following breaks in the
 418 // same Paragraph one to the right and make a rebreak
 419 void Text::insertChar(Cursor & cur, char_type c)
 420 {
 421         LASSERT(this == cur.text(), /**/);
 422
 423         cur.recordUndo(INSERT_UNDO);
 424
 425         TextMetrics const & tm = cur.bv().textMetrics(this);
 426         Buffer const & buffer = cur.buffer();
 427         Paragraph & par = cur.paragraph();
 428         // try to remove this
 429         pit_type const pit = cur.pit();
 430
 431         bool const freeSpacing = par.layout().free_spacing ||
 432                 par.isFreeSpacing();
 433
 434         if (lyxrc.auto_number) {
 435                 static docstring const number_operators = from_ascii("+-/*");
 436                 static docstring const number_unary_operators = from_ascii("+-");
 437                 static docstring const number_seperators = from_ascii(".,:");
 438
 439                 if (cur.current_font.fontInfo().number() == FONT_ON) {
 440                         if (!isDigit(c) && !contains(number_operators, c) &&
 441                             !(contains(number_seperators, c) &&
 442                               cur.pos() != 0 &&
 443                               cur.pos() != cur.lastpos() &&
 444                               tm.displayFont(pit, cur.pos()).fontInfo().number() == FONT_ON &&
 445                               tm.displayFont(pit, cur.pos() - 1).fontInfo().number() == FONT_ON)
 446                            )
 447                                 number(cur); // Set current_font.number to OFF
 448                 } else if (isDigit(c) &&
 449                            cur.real_current_font.isVisibleRightToLeft()) {
 450                         number(cur); // Set current_font.number to ON
 451
 452                         if (cur.pos() != 0) {
 453                                 char_type const c = par.getChar(cur.pos() - 1);
 454                                 if (contains(number_unary_operators, c) &&
 455                                     (cur.pos() == 1
 456                                      || par.isSeparator(cur.pos() - 2)
 457                                      || par.isNewline(cur.pos() - 2))
 458                                   ) {
 459                                         setCharFont(buffer, pit, cur.pos() - 1, cur.current_font,
 460                                                 tm.font_);
 461                                 } else if (contains(number_seperators, c)
 462                                      && cur.pos() >= 2
 463                                      && tm.displayFont(pit, cur.pos() - 2).fontInfo().number() == FONT_ON) {
 464                                         setCharFont(buffer, pit, cur.pos() - 1, cur.current_font,
 465                                                 tm.font_);
 466                                 }
 467                         }
 468                 }
 469         }
 470
 471         // In Bidi text, we want spaces to be treated in a special way: spaces
 472         // which are between words in different languages should get the
 473         // paragraph's language; otherwise, spaces should keep the language
 474         // they were originally typed in. This is only in effect while typing;
 475         // after the text is already typed in, the user can always go back and
 476         // explicitly set the language of a space as desired. But 99.9% of the
 477         // time, what we're doing here is what the user actually meant.
 478         //
 479         // The following cases are the ones in which the language of the space
 480         // should be changed to match that of the containing paragraph. In the
 481         // depictions, lowercase is LTR, uppercase is RTL, underscore (_)
 482         // represents a space, pipe (|) represents the cursor position (so the
 483         // character before it is the one just typed in). The different cases
 484         // are depicted logically (not visually), from left to right:
 485         //
 486         // 1. A_a|
 487         // 2. a_A|
 488         //
 489         // Theoretically, there are other situations that we should, perhaps, deal
 490         // with (e.g.: a|_A, A|_a). In practice, though, there really isn't any
 491         // point (to understand why, just try to create this situation...).
 492
 493         if ((cur.pos() >= 2) && (par.isLineSeparator(cur.pos() - 1))) {
 494                 // get font in front and behind the space in question. But do NOT
 495                 // use getFont(cur.pos()) because the character c is not inserted yet
 496                 Font const pre_space_font  = tm.displayFont(cur.pit(), cur.pos() - 2);
 497                 Font const & post_space_font = cur.real_current_font;
 498                 bool pre_space_rtl  = pre_space_font.isVisibleRightToLeft();
 499                 bool post_space_rtl = post_space_font.isVisibleRightToLeft();
 500
 501                 if (pre_space_rtl != post_space_rtl) {
 502                         // Set the space's language to match the language of the
 503                         // adjacent character whose direction is the paragraph's
 504                         // direction; don't touch other properties of the font
 505                         Language const * lang =
 506                                 (pre_space_rtl == par.isRTL(buffer.params())) ?
 507                                 pre_space_font.language() : post_space_font.language();
 508
 509                         Font space_font = tm.displayFont(cur.pit(), cur.pos() - 1);
 510                         space_font.setLanguage(lang);
 511                         par.setFont(cur.pos() - 1, space_font);
 512                 }
 513         }
 514
 515         // Next check, if there will be two blanks together or a blank at
 516         // the beginning of a paragraph.
 517         // I decided to handle blanks like normal characters, the main
 518         // difference are the special checks when calculating the row.fill
 519         // (blank does not count at the end of a row) and the check here
 520
 521         // When the free-spacing option is set for the current layout,
 522         // disable the double-space checking
 523         if (!freeSpacing && isLineSeparatorChar(c)) {
 524                 if (cur.pos() == 0) {
 525                         static bool sent_space_message = false;
 526                         if (!sent_space_message) {
 527                                 cur.message(_("You cannot insert a space at the "
 528                                                            "beginning of a paragraph. Please read the Tutorial."));
 529                                 sent_space_message = true;
 530                         }
 531                         return;
 532                 }
 533                 LASSERT(cur.pos() > 0, /**/);
 534                 if ((par.isLineSeparator(cur.pos() - 1) || par.isNewline(cur.pos() - 1))
 535                     && !par.isDeleted(cur.pos() - 1)) {
 536                         static bool sent_space_message = false;
 537                         if (!sent_space_message) {
 538                                 cur.message(_("You cannot type two spaces this way. "
 539                                                            "Please read the Tutorial."));
 540                                 sent_space_message = true;
 541                         }
 542                         return;
 543                 }
 544         }
 545
 546         par.insertChar(cur.pos(), c, cur.current_font, cur.buffer().params().trackChanges);
 547         cur.checkBufferStructure();
 548
 549 //              cur.updateFlags(Update::Force);
 550         setCursor(cur.top(), cur.pit(), cur.pos() + 1);
 551         charInserted(cur);
 552 }
 553
 554
 555 void Text::charInserted(Cursor & cur)
 556 {
 557         Paragraph & par = cur.paragraph();
 558
 559         // Here we call finishUndo for every 20 characters inserted.
 560         // This is from my experience how emacs does it. (Lgb)
 561         static unsigned int counter;
 562         if (counter < 20) {
 563                 ++counter;
 564         } else {
 565                 cur.finishUndo();
 566                 counter = 0;
 567         }
 568
 569         // register word if a non-letter was entered
 570         if (cur.pos() > 1
 571             && par.isLetter(cur.pos() - 2)
 572             && !par.isLetter(cur.pos() - 1)) {
 573                 // get the word in front of cursor
 574                 LASSERT(this == cur.text(), /**/);
 575                 cur.paragraph().updateWords(cur.top());
 576         }
 577 }
 578
 579
 580 // the cursor set functions have a special mechanism. When they
 581 // realize, that you left an empty paragraph, they will delete it.
 582
 583 bool Text::cursorForwardOneWord(Cursor & cur)
 584 {
 585         LASSERT(this == cur.text(), /**/);
 586
 587         Cursor old = cur;
 588
 589         if (old.pos() == old.lastpos() && old.pit() != old.lastpit()) {
 590                 ++old.pit();
 591                 old.pos() = 0;
 592         } else {
 593                 // Advance through word.
 594                 while (old.pos() != old.lastpos() && old.paragraph().isLetter(old.pos()))
 595                         ++old.pos();
 596                 // Skip through trailing nonword stuff.
 597                 while (old.pos() != old.lastpos() && !old.paragraph().isLetter(old.pos()))
 598                         ++old.pos();
 599         }
 600         return setCursor(cur, old.pit(), old.pos());
 601 }
 602
 603
 604 bool Text::cursorBackwardOneWord(Cursor & cur)
 605 {
 606         LASSERT(this == cur.text(), /**/);
 607
 608         Cursor old = cur;
 609
 610         if (old.pos() == 0 && old.pit() != 0) {
 611                 --old.pit();
 612                 old.pos() = old.lastpos();
 613         } else {
 614                 // Skip through initial nonword stuff.
 615                 while (old.pos() != 0 && !old.paragraph().isLetter(old.pos() - 1))
 616                         --old.pos();
 617                 // Advance through word.
 618                 while (old.pos() != 0 && old.paragraph().isLetter(old.pos() - 1))
 619                         --old.pos();
 620         }
 621         return setCursor(cur, old.pit(), old.pos());
 622 }
 623
 624
 625 void Text::selectWord(Cursor & cur, word_location loc)
 626 {
 627         LASSERT(this == cur.text(), /**/);
 628         CursorSlice from = cur.top();
 629         CursorSlice to = cur.top();
 630         getWord(from, to, loc);
 631         if (cur.top() != from)
 632                 setCursor(cur, from.pit(), from.pos());
 633         if (to == from)
 634                 return;
 635         cur.resetAnchor();
 636         setCursor(cur, to.pit(), to.pos());
 637         cur.setSelection();
 638 }
 639
 640
 641 // Select the word currently under the cursor when no
 642 // selection is currently set
 643 bool Text::selectWordWhenUnderCursor(Cursor & cur, word_location loc)
 644 {
 645         LASSERT(this == cur.text(), /**/);
 646         if (cur.selection())
 647                 return false;
 648         selectWord(cur, loc);
 649         return cur.selection();
 650 }
 651
 652
 653 void Text::acceptOrRejectChanges(Cursor & cur, ChangeOp op)
 654 {
 655         LASSERT(this == cur.text(), /**/);
 656
 657         if (!cur.selection())
 658                 return;
 659
 660         cur.recordUndoSelection();
 661
 662         pit_type begPit = cur.selectionBegin().pit();
 663         pit_type endPit = cur.selectionEnd().pit();
 664
 665         pos_type begPos = cur.selectionBegin().pos();
 666         pos_type endPos = cur.selectionEnd().pos();
 667
 668         // keep selection info, because endPos becomes invalid after the first loop
 669         bool endsBeforeEndOfPar = (endPos < pars_[endPit].size());
 670
 671         // first, accept/reject changes within each individual paragraph (do not consider end-of-par)
 672
 673         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 674                 pos_type parSize = pars_[pit].size();
 675
 676                 // ignore empty paragraphs; otherwise, an assertion will fail for
 677                 // acceptChanges(bparams, 0, 0) or rejectChanges(bparams, 0, 0)
 678                 if (parSize == 0)
 679                         continue;
 680
 681                 // do not consider first paragraph if the cursor starts at pos size()
 682                 if (pit == begPit && begPos == parSize)
 683                         continue;
 684
 685                 // do not consider last paragraph if the cursor ends at pos 0
 686                 if (pit == endPit && endPos == 0)
 687                         break; // last iteration anyway
 688
 689                 pos_type left  = (pit == begPit ? begPos : 0);
 690                 pos_type right = (pit == endPit ? endPos : parSize);
 691
 692                 if (op == ACCEPT) {
 693                         pars_[pit].acceptChanges(cur.buffer().params(), left, right);
 694                 } else {
 695                         pars_[pit].rejectChanges(cur.buffer().params(), left, right);
 696                 }
 697         }
 698
 699         // next, accept/reject imaginary end-of-par characters
 700
 701         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 702                 pos_type pos = pars_[pit].size();
 703
 704                 // skip if the selection ends before the end-of-par
 705                 if (pit == endPit && endsBeforeEndOfPar)
 706                         break; // last iteration anyway
 707
 708                 // skip if this is not the last paragraph of the document
 709                 // note: the user should be able to accept/reject the par break of the last par!
 710                 if (pit == endPit && pit + 1 != int(pars_.size()))
 711                         break; // last iteration anway
 712
 713                 if (op == ACCEPT) {
 714                         if (pars_[pit].isInserted(pos)) {
 715                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 716                         } else if (pars_[pit].isDeleted(pos)) {
 717                                 if (pit + 1 == int(pars_.size())) {
 718                                         // we cannot remove a par break at the end of the last paragraph;
 719                                         // instead, we mark it unchanged
 720                                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 721                                 } else {
 722                                         mergeParagraph(cur.buffer().params(), pars_, pit);
 723                                         --endPit;
 724                                         --pit;
 725                                 }
 726                         }
 727                 } else {
 728                         if (pars_[pit].isDeleted(pos)) {
 729                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 730                         } else if (pars_[pit].isInserted(pos)) {
 731                                 if (pit + 1 == int(pars_.size())) {
 732                                         // we mark the par break at the end of the last paragraph unchanged
 733                                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 734                                 } else {
 735                                         mergeParagraph(cur.buffer().params(), pars_, pit);
 736                                         --endPit;
 737                                         --pit;
 738                                 }
 739                         }
 740                 }
 741         }
 742
 743         // finally, invoke the DEPM
 744
 745         deleteEmptyParagraphMechanism(begPit, endPit, cur.buffer().params().trackChanges);
 746
 747         //
 748
 749         cur.finishUndo();
 750         cur.clearSelection();
 751         setCursorIntern(cur, begPit, begPos);
 752         cur.updateFlags(Update::Force);
 753         updateLabels(cur.buffer());
 754 }
 755
 756
 757 void Text::acceptChanges(BufferParams const & bparams)
 758 {
 759         lyx::acceptChanges(pars_, bparams);
 760         deleteEmptyParagraphMechanism(0, pars_.size() - 1, bparams.trackChanges);
 761 }
 762
 763
 764 void Text::rejectChanges(BufferParams const & bparams)
 765 {
 766         pit_type pars_size = static_cast<pit_type>(pars_.size());
 767
 768         // first, reject changes within each individual paragraph
 769         // (do not consider end-of-par)
 770         for (pit_type pit = 0; pit < pars_size; ++pit) {
 771                 if (!pars_[pit].empty())   // prevent assertion failure
 772                         pars_[pit].rejectChanges(bparams, 0, pars_[pit].size());
 773         }
 774
 775         // next, reject imaginary end-of-par characters
 776         for (pit_type pit = 0; pit < pars_size; ++pit) {
 777                 pos_type pos = pars_[pit].size();
 778
 779                 if (pars_[pit].isDeleted(pos)) {
 780                         pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 781                 } else if (pars_[pit].isInserted(pos)) {
 782                         if (pit == pars_size - 1) {
 783                                 // we mark the par break at the end of the last
 784                                 // paragraph unchanged
 785                                 pars_[pit].setChange(pos, Change(Change::UNCHANGED));
 786                         } else {
 787                                 mergeParagraph(bparams, pars_, pit);
 788                                 --pit;
 789                                 --pars_size;
 790                         }
 791                 }
 792         }
 793
 794         // finally, invoke the DEPM
 795         deleteEmptyParagraphMechanism(0, pars_size - 1, bparams.trackChanges);
 796 }
 797
 798
 799 void Text::deleteWordForward(Cursor & cur)
 800 {
 801         LASSERT(this == cur.text(), /**/);
 802         if (cur.lastpos() == 0)
 803                 cursorForward(cur);
 804         else {
 805                 cur.resetAnchor();
 806                 cur.selection() = true;
 807                 cursorForwardOneWord(cur);
 808                 cur.setSelection();
 809                 cutSelection(cur, true, false);
 810                 cur.checkBufferStructure();
 811         }
 812 }
 813
 814
 815 void Text::deleteWordBackward(Cursor & cur)
 816 {
 817         LASSERT(this == cur.text(), /**/);
 818         if (cur.lastpos() == 0)
 819                 cursorBackward(cur);
 820         else {
 821                 cur.resetAnchor();
 822                 cur.selection() = true;
 823                 cursorBackwardOneWord(cur);
 824                 cur.setSelection();
 825                 cutSelection(cur, true, false);
 826                 cur.checkBufferStructure();
 827         }
 828 }
 829
 830
 831 // Kill to end of line.
 832 void Text::changeCase(Cursor & cur, TextCase action)
 833 {
 834         LASSERT(this == cur.text(), /**/);
 835         CursorSlice from;
 836         CursorSlice to;
 837
 838         bool gotsel = false;
 839         if (cur.selection()) {
 840                 from = cur.selBegin();
 841                 to = cur.selEnd();
 842                 gotsel = true;
 843         } else {
 844                 from = cur.top();
 845                 getWord(from, to, PARTIAL_WORD);
 846                 cursorForwardOneWord(cur);
 847         }
 848
 849         cur.recordUndoSelection();
 850
 851         pit_type begPit = from.pit();
 852         pit_type endPit = to.pit();
 853
 854         pos_type begPos = from.pos();
 855         pos_type endPos = to.pos();
 856
 857         pos_type right = 0; // needed after the for loop
 858
 859         for (pit_type pit = begPit; pit <= endPit; ++pit) {
 860                 Paragraph & par = pars_[pit];
 861                 pos_type const pos = (pit == begPit ? begPos : 0);
 862                 right = (pit == endPit ? endPos : par.size());
 863                 par.changeCase(cur.buffer().params(), pos, right, action);
 864         }
 865
 866         // the selection may have changed due to logically-only deleted chars
 867         if (gotsel) {
 868                 setCursor(cur, begPit, begPos);
 869                 cur.resetAnchor();
 870                 setCursor(cur, endPit, right);
 871                 cur.setSelection();
 872         } else
 873                 setCursor(cur, endPit, right);
 874
 875         cur.checkBufferStructure();
 876 }
 877
 878
 879 bool Text::handleBibitems(Cursor & cur)
 880 {
 881         if (cur.paragraph().layout().labeltype != LABEL_BIBLIO)
 882                 return false;
 883
 884         if (cur.pos() != 0)
 885                 return false;
 886
 887         BufferParams const & bufparams = cur.buffer().params();
 888         Paragraph const & par = cur.paragraph();
 889         Cursor prevcur = cur;
 890         if (cur.pit() > 0) {
 891                 --prevcur.pit();
 892                 prevcur.pos() = prevcur.lastpos();
 893         }
 894         Paragraph const & prevpar = prevcur.paragraph();
 895
 896         // if a bibitem is deleted, merge with previous paragraph
 897         // if this is a bibliography item as well
 898         if (cur.pit() > 0 && par.layout() == prevpar.layout()) {
 899                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit());
 900                 mergeParagraph(bufparams, cur.text()->paragraphs(),
 901                                                         prevcur.pit());
 902                 updateLabels(cur.buffer());
 903                 setCursorIntern(cur, prevcur.pit(), prevcur.pos());
 904                 cur.updateFlags(Update::Force);
 905                 return true;
 906         }
 907
 908         // otherwise reset to default
 909         cur.paragraph().setEmptyOrDefaultLayout(bufparams.documentClass());
 910         return true;
 911 }
 912
 913
 914 bool Text::erase(Cursor & cur)
 915 {
 916         LASSERT(this == cur.text(), /**/);
 917         bool needsUpdate = false;
 918         Paragraph & par = cur.paragraph();
 919
 920         if (cur.pos() != cur.lastpos()) {
 921                 // this is the code for a normal delete, not pasting
 922                 // any paragraphs
 923                 cur.recordUndo(DELETE_UNDO);
 924                 bool const was_inset = cur.paragraph().isInset(cur.pos());
 925                 if(!par.eraseChar(cur.pos(), cur.buffer().params().trackChanges))
 926                         // the character has been logically deleted only => skip it
 927                         cur.top().forwardPos();
 928
 929                 if (was_inset)
 930                         updateLabels(cur.buffer());
 931                 else
 932                         cur.checkBufferStructure();
 933                 needsUpdate = true;
 934         } else {
 935                 if (cur.pit() == cur.lastpit())
 936                         return dissolveInset(cur);
 937
 938                 if (!par.isMergedOnEndOfParDeletion(cur.buffer().params().trackChanges)) {
 939                         par.setChange(cur.pos(), Change(Change::DELETED));
 940                         cur.forwardPos();
 941                         needsUpdate = true;
 942                 } else {
 943                         setCursorIntern(cur, cur.pit() + 1, 0);
 944                         needsUpdate = backspacePos0(cur);
 945                 }
 946         }
 947
 948         needsUpdate |= handleBibitems(cur);
 949
 950         if (needsUpdate) {
 951                 // Make sure the cursor is correct. Is this really needed?
 952                 // No, not really... at least not here!
 953                 cur.text()->setCursor(cur.top(), cur.pit(), cur.pos());
 954                 cur.checkBufferStructure();
 955         }
 956
 957         return needsUpdate;
 958 }
 959
 960
 961 bool Text::backspacePos0(Cursor & cur)
 962 {
 963         LASSERT(this == cur.text(), /**/);
 964         if (cur.pit() == 0)
 965                 return false;
 966
 967         bool needsUpdate = false;
 968
 969         BufferParams const & bufparams = cur.buffer().params();
 970         DocumentClass const & tclass = bufparams.documentClass();
 971         ParagraphList & plist = cur.text()->paragraphs();
 972         Paragraph const & par = cur.paragraph();
 973         Cursor prevcur = cur;
 974         --prevcur.pit();
 975         prevcur.pos() = prevcur.lastpos();
 976         Paragraph const & prevpar = prevcur.paragraph();
 977
 978         // is it an empty paragraph?
 979         if (cur.lastpos() == 0
 980             || (cur.lastpos() == 1 && par.isSeparator(0))) {
 981                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit(), cur.pit());
 982                 plist.erase(boost::next(plist.begin(), cur.pit()));
 983                 needsUpdate = true;
 984         }
 985         // is previous par empty?
 986         else if (prevcur.lastpos() == 0
 987                  || (prevcur.lastpos() == 1 && prevpar.isSeparator(0))) {
 988                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit(), cur.pit());
 989                 plist.erase(boost::next(plist.begin(), prevcur.pit()));
 990                 needsUpdate = true;
 991         }
 992         // Pasting is not allowed, if the paragraphs have different
 993         // layouts. I think it is a real bug of all other
 994         // word processors to allow it. It confuses the user.
 995         // Correction: Pasting is always allowed with standard-layout
 996         // or the empty layout.
 997         else if (par.layout() == prevpar.layout()
 998                  || tclass.isDefaultLayout(par.layout())
 999                  || tclass.isEmptyLayout(par.layout())) {
1000                 cur.recordUndo(ATOMIC_UNDO, prevcur.pit());
1001                 mergeParagraph(bufparams, plist, prevcur.pit());
1002                 needsUpdate = true;
1003         }
1004
1005         if (needsUpdate) {
1006                 updateLabels(cur.buffer());
1007                 setCursorIntern(cur, prevcur.pit(), prevcur.pos());
1008         }
1009
1010         return needsUpdate;
1011 }
1012
1013
1014 bool Text::backspace(Cursor & cur)
1015 {
1016         LASSERT(this == cur.text(), /**/);
1017         bool needsUpdate = false;
1018         if (cur.pos() == 0) {
1019                 if (cur.pit() == 0)
1020                         return dissolveInset(cur);
1021
1022                 Paragraph & prev_par = pars_[cur.pit() - 1];
1023
1024                 if (!prev_par.isMergedOnEndOfParDeletion(cur.buffer().params().trackChanges)) {
1025                         prev_par.setChange(prev_par.size(), Change(Change::DELETED));
1026                         setCursorIntern(cur, cur.pit() - 1, prev_par.size());
1027                         return true;
1028                 }
1029                 // The cursor is at the beginning of a paragraph, so
1030                 // the backspace will collapse two paragraphs into one.
1031                 needsUpdate = backspacePos0(cur);
1032
1033         } else {
1034                 // this is the code for a normal backspace, not pasting
1035                 // any paragraphs
1036                 cur.recordUndo(DELETE_UNDO);
1037                 // We used to do cursorBackwardIntern() here, but it is
1038                 // not a good idea since it triggers the auto-delete
1039                 // mechanism. So we do a cursorBackwardIntern()-lite,
1040                 // without the dreaded mechanism. (JMarc)
1041                 setCursorIntern(cur, cur.pit(), cur.pos() - 1,
1042                                 false, cur.boundary());
1043                 bool const was_inset = cur.paragraph().isInset(cur.pos());
1044                 cur.paragraph().eraseChar(cur.pos(), cur.buffer().params().trackChanges);
1045                 if (was_inset)
1046                         updateLabels(cur.buffer());
1047                 else
1048                         cur.checkBufferStructure();
1049         }
1050
1051         if (cur.pos() == cur.lastpos())
1052                 cur.setCurrentFont();
1053
1054         needsUpdate |= handleBibitems(cur);
1055
1056         // A singlePar update is not enough in this case.
1057 //              cur.updateFlags(Update::Force);
1058         setCursor(cur.top(), cur.pit(), cur.pos());
1059
1060         return needsUpdate;
1061 }
1062
1063
1064 bool Text::dissolveInset(Cursor & cur) {
1065         LASSERT(this == cur.text(), /**/);
1066
1067         if (isMainText(cur.bv().buffer()) || cur.inset().nargs() != 1)
1068                 return false;
1069
1070         cur.recordUndoInset();
1071         cur.mark() = false;
1072         cur.selHandle(false);
1073         // save position
1074         pos_type spos = cur.pos();
1075         pit_type spit = cur.pit();
1076         ParagraphList plist;
1077         if (cur.lastpit() != 0 || cur.lastpos() != 0)
1078                 plist = paragraphs();
1079         cur.popBackward();
1080         // store cursor offset
1081         if (spit == 0)
1082                 spos += cur.pos();
1083         spit += cur.pit();
1084         Buffer & b = cur.buffer();
1085         cur.paragraph().eraseChar(cur.pos(), b.params().trackChanges);
1086         if (!plist.empty()) {
1087                 // ERT paragraphs have the Language latex_language.
1088                 // This is invalid outside of ERT, so we need to
1089                 // change it to the buffer language.
1090                 ParagraphList::iterator it = plist.begin();
1091                 ParagraphList::iterator it_end = plist.end();
1092                 for (; it != it_end; it++)
1093                         it->changeLanguage(b.params(), latex_language, b.language());
1094
1095                 pasteParagraphList(cur, plist, b.params().documentClassPtr(),
1096                                    b.errorList("Paste"));
1097                 // restore position
1098                 cur.pit() = min(cur.lastpit(), spit);
1099                 cur.pos() = min(cur.lastpos(), spos);
1100         }
1101         cur.clearSelection();
1102         cur.resetAnchor();
1103         return true;
1104 }
1105
1106
1107 void Text::getWord(CursorSlice & from, CursorSlice & to,
1108         word_location const loc) const
1109 {
1110         Paragraph const & from_par = pars_[from.pit()];
1111         switch (loc) {
1112         case WHOLE_WORD_STRICT:
1113                 if (from.pos() == 0 || from.pos() == from_par.size()
1114                     || !from_par.isLetter(from.pos())
1115                     || !from_par.isLetter(from.pos() - 1)) {
1116                         to = from;
1117                         return;
1118                 }
1119                 // no break here, we go to the next
1120
1121         case WHOLE_WORD:
1122                 // If we are already at the beginning of a word, do nothing
1123                 if (!from.pos() || !from_par.isLetter(from.pos() - 1))
1124                         break;
1125                 // no break here, we go to the next
1126
1127         case PREVIOUS_WORD:
1128                 // always move the cursor to the beginning of previous word
1129                 while (from.pos() && from_par.isLetter(from.pos() - 1))
1130                         --from.pos();
1131                 break;
1132         case NEXT_WORD:
1133                 LYXERR0("Text::getWord: NEXT_WORD not implemented yet");
1134                 break;
1135         case PARTIAL_WORD:
1136                 // no need to move the 'from' cursor
1137                 break;
1138         }
1139         to = from;
1140         Paragraph const & to_par = pars_[to.pit()];
1141         while (to.pos() < to_par.size() && to_par.isLetter(to.pos()))
1142                 ++to.pos();
1143 }
1144
1145
1146 void Text::write(Buffer const & buf, ostream & os) const
1147 {
1148         ParagraphList::const_iterator pit = paragraphs().begin();
1149         ParagraphList::const_iterator end = paragraphs().end();
1150         depth_type dth = 0;
1151         for (; pit != end; ++pit)
1152                 pit->write(os, buf.params(), dth);
1153
1154         // Close begin_deeper
1155         for(; dth > 0; --dth)
1156                 os << "\n\\end_deeper";
1157 }
1158
1159
1160 bool Text::read(Buffer const & buf, Lexer & lex,
1161                 ErrorList & errorList, InsetText * insetPtr)
1162 {
1163         depth_type depth = 0;
1164
1165         while (lex.isOK()) {
1166                 lex.nextToken();
1167                 string const token = lex.getString();
1168
1169                 if (token.empty())
1170                         continue;
1171
1172                 if (token == "\\end_inset")
1173                         break;
1174
1175                 if (token == "\\end_body")
1176                         continue;
1177
1178                 if (token == "\\begin_body")
1179                         continue;
1180
1181                 if (token == "\\end_document")
1182                         return false;
1183
1184                 if (token == "\\begin_layout") {
1185                         lex.pushToken(token);
1186
1187                         Paragraph par;
1188                         par.params().depth(depth);
1189                         par.setFont(0, Font(inherit_font, buf.params().language));
1190                         par.setInsetOwner(insetPtr);
1191                         pars_.push_back(par);
1192
1193                         // FIXME: goddamn InsetTabular makes us pass a Buffer
1194                         // not BufferParams
1195                         lyx::readParagraph(buf, pars_.back(), lex, errorList);
1196
1197                         // register the words in the global word list
1198                         CursorSlice sl = CursorSlice(*insetPtr);
1199                         sl.pit() = pars_.size() - 1;
1200                         pars_.back().updateWords(sl);
1201                 } else if (token == "\\begin_deeper") {
1202                         ++depth;
1203                 } else if (token == "\\end_deeper") {
1204                         if (!depth)
1205                                 lex.printError("\\end_deeper: " "depth is already null");
1206                         else
1207                                 --depth;
1208                 } else {
1209                         LYXERR0("Handling unknown body token: `" << token << '\'');
1210                 }
1211         }
1212         return true;
1213 }
1214
1215 // Returns the current font and depth as a message.
1216 docstring Text::currentState(Cursor & cur)
1217 {
1218         LASSERT(this == cur.text(), /**/);
1219         Buffer & buf = cur.buffer();
1220         Paragraph const & par = cur.paragraph();
1221         odocstringstream os;
1222
1223         if (buf.params().trackChanges)
1224                 os << _("[Change Tracking] ");
1225
1226         Change change = par.lookupChange(cur.pos());
1227
1228         if (change.type != Change::UNCHANGED) {
1229                 Author const & a = buf.params().authors().get(change.author);
1230                 os << _("Change: ") << a.name();
1231                 if (!a.email().empty())
1232                         os << " (" << a.email() << ")";
1233                 // FIXME ctime is english, we should translate that
1234                 os << _(" at ") << ctime(&change.changetime);
1235                 os << " : ";
1236         }
1237
1238         // I think we should only show changes from the default
1239         // font. (Asger)
1240         // No, from the document font (MV)
1241         Font font = cur.real_current_font;
1242         font.fontInfo().reduce(buf.params().getFont().fontInfo());
1243
1244         os << bformat(_("Font: %1$s"), font.stateText(&buf.params()));
1245
1246         // The paragraph depth
1247         int depth = cur.paragraph().getDepth();
1248         if (depth > 0)
1249                 os << bformat(_(", Depth: %1$d"), depth);
1250
1251         // The paragraph spacing, but only if different from
1252         // buffer spacing.
1253         Spacing const & spacing = par.params().spacing();
1254         if (!spacing.isDefault()) {
1255                 os << _(", Spacing: ");
1256                 switch (spacing.getSpace()) {
1257                 case Spacing::Single:
1258                         os << _("Single");
1259                         break;
1260                 case Spacing::Onehalf:
1261                         os << _("OneHalf");
1262                         break;
1263                 case Spacing::Double:
1264                         os << _("Double");
1265                         break;
1266                 case Spacing::Other:
1267                         os << _("Other (") << from_ascii(spacing.getValueAsString()) << ')';
1268                         break;
1269                 case Spacing::Default:
1270                         // should never happen, do nothing
1271                         break;
1272                 }
1273         }
1274
1275 #ifdef DEVEL_VERSION
1276         os << _(", Inset: ") << &cur.inset();
1277         os << _(", Paragraph: ") << cur.pit();
1278         os << _(", Id: ") << par.id();
1279         os << _(", Position: ") << cur.pos();
1280         // FIXME: Why is the check for par.size() needed?
1281         // We are called with cur.pos() == par.size() quite often.
1282         if (!par.empty() && cur.pos() < par.size()) {
1283                 // Force output of code point, not character
1284                 size_t const c = par.getChar(cur.pos());
1285                 os << _(", Char: 0x") << hex << c;
1286         }
1287         os << _(", Boundary: ") << cur.boundary();
1288 //      Row & row = cur.textRow();
1289 //      os << bformat(_(", Row b:%1$d e:%2$d"), row.pos(), row.endpos());
1290 #endif
1291         return os.str();
1292 }
1293
1294
1295 docstring Text::getPossibleLabel(Cursor & cur) const
1296 {
1297         pit_type pit = cur.pit();
1298
1299         Layout const * layout = &(pars_[pit].layout());
1300
1301         docstring text;
1302         docstring par_text = pars_[pit].asString(false);
1303         string piece;
1304         // the return string of math matrices might contain linebreaks
1305         par_text = subst(par_text, '\n', '-');
1306         for (int i = 0; i < lyxrc.label_init_length; ++i) {
1307                 if (par_text.empty())
1308                         break;
1309                 docstring head;
1310                 par_text = split(par_text, head, ' ');
1311                 // Is it legal to use spaces in labels ?
1312                 if (i > 0)
1313                         text += '-';
1314                 text += head;
1315         }
1316
1317         // No need for a prefix if the user said so.
1318         if (lyxrc.label_init_length <= 0)
1319                 return text;
1320
1321         // Will contain the label type.
1322         docstring name;
1323
1324         // For section, subsection, etc...
1325         if (layout->latextype == LATEX_PARAGRAPH && pit != 0) {
1326                 Layout const * layout2 = &(pars_[pit - 1].layout());
1327                 if (layout2->latextype != LATEX_PARAGRAPH) {
1328                         --pit;
1329                         layout = layout2;
1330                 }
1331         }
1332         if (layout->latextype != LATEX_PARAGRAPH)
1333                 name = from_ascii(layout->latexname());
1334
1335         // for captions, we just take the caption type
1336         Inset * caption_inset = cur.innerInsetOfType(CAPTION_CODE);
1337         if (caption_inset)
1338                 name = from_ascii(static_cast<InsetCaption *>(caption_inset)->type());
1339
1340         // If none of the above worked, we'll see if we're inside various
1341         // types of insets and take our abbreviation from them.
1342         if (name.empty()) {
1343                 InsetCode const codes[] = {
1344                         FLOAT_CODE,
1345                         WRAP_CODE,
1346                         FOOT_CODE
1347                 };
1348                 for (unsigned int i = 0; i < (sizeof codes / sizeof codes[0]); ++i) {
1349                         Inset * float_inset = cur.innerInsetOfType(codes[i]);
1350                         if (float_inset) {
1351                                 name = float_inset->name();
1352                                 break;
1353                         }
1354                 }
1355         }
1356
1357         // Create a correct prefix for prettyref
1358         if (name == "theorem")
1359                 name = from_ascii("thm");
1360         else if (name == "Foot")
1361                 name = from_ascii("fn");
1362         else if (name == "listing")
1363                 name = from_ascii("lst");
1364
1365         if (!name.empty())
1366                 text = name.substr(0, 3) + ':' + text;
1367
1368         return text;
1369 }
1370
1371
1372 void Text::charsTranspose(Cursor & cur)
1373 {
1374         LASSERT(this == cur.text(), /**/);
1375
1376         pos_type pos = cur.pos();
1377
1378         // If cursor is at beginning or end of paragraph, do nothing.
1379         if (pos == cur.lastpos() || pos == 0)
1380                 return;
1381
1382         Paragraph & par = cur.paragraph();
1383
1384         // Get the positions of the characters to be transposed.
1385         pos_type pos1 = pos - 1;
1386         pos_type pos2 = pos;
1387
1388         // In change tracking mode, ignore deleted characters.
1389         while (pos2 < cur.lastpos() && par.isDeleted(pos2))
1390                 ++pos2;
1391         if (pos2 == cur.lastpos())
1392                 return;
1393
1394         while (pos1 >= 0 && par.isDeleted(pos1))
1395                 --pos1;
1396         if (pos1 < 0)
1397                 return;
1398
1399         // Don't do anything if one of the "characters" is not regular text.
1400         if (par.isInset(pos1) || par.isInset(pos2))
1401                 return;
1402
1403         // Store the characters to be transposed (including font information).
1404         char_type char1 = par.getChar(pos1);
1405         Font const font1 =
1406                 par.getFontSettings(cur.buffer().params(), pos1);
1407
1408         char_type char2 = par.getChar(pos2);
1409         Font const font2 =
1410                 par.getFontSettings(cur.buffer().params(), pos2);
1411
1412         // And finally, we are ready to perform the transposition.
1413         // Track the changes if Change Tracking is enabled.
1414         bool const trackChanges = cur.buffer().params().trackChanges;
1415
1416         cur.recordUndo();
1417
1418         par.eraseChar(pos2, trackChanges);
1419         par.eraseChar(pos1, trackChanges);
1420         par.insertChar(pos1, char2, font2, trackChanges);
1421         par.insertChar(pos2, char1, font1, trackChanges);
1422
1423         cur.checkBufferStructure();
1424
1425         // After the transposition, move cursor to after the transposition.
1426         setCursor(cur, cur.pit(), pos2);
1427         cur.forwardPos();
1428 }
1429
1430
1431 DocIterator Text::macrocontextPosition() const
1432 {
1433         return macrocontext_position_;
1434 }
1435
1436
1437 void Text::setMacrocontextPosition(DocIterator const & pos)
1438 {
1439         macrocontext_position_ = pos;
1440 }
1441
1442
1443 docstring Text::previousWord(CursorSlice const & sl) const
1444 {
1445         CursorSlice from = sl;
1446         CursorSlice to = sl;
1447         getWord(from, to, PREVIOUS_WORD);
1448         if (sl == from || to == from)
1449                 return docstring();
1450
1451         Paragraph const & par = sl.paragraph();
1452         return par.asString(from.pos(), to.pos(), false);
1453 }
1454
1455
1456 bool Text::completionSupported(Cursor const & cur) const
1457 {
1458         Paragraph const & par = cur.paragraph();
1459         return cur.pos() > 0
1460                 && (cur.pos() >= par.size() || !par.isLetter(cur.pos()))
1461                 && par.isLetter(cur.pos() - 1);
1462 }
1463
1464
1465 CompletionList const * Text::createCompletionList(Cursor const & cur) const
1466 {
1467         return new TextCompletionList(cur);
1468 }
1469
1470
1471 bool Text::insertCompletion(Cursor & cur, docstring const & s, bool /*finished*/)
1472 {
1473         LASSERT(cur.bv().cursor() == cur, /**/);
1474         cur.insert(s);
1475         cur.bv().cursor() = cur;
1476         if (!(cur.disp_.update() & Update::Force))
1477                 cur.updateFlags(cur.disp_.update() | Update::SinglePar);
1478         return true;
1479 }
1480
1481
1482 docstring Text::completionPrefix(Cursor const & cur) const
1483 {
1484         return previousWord(cur.top());
1485 }
1486
1487 } // namespace lyx