src/BufferView2.C

   1 /* This file is part of
   2  * ======================================================
   3  *
   4  *           LyX, The Document Processor
   5  *
   6  *           Copyright 1995 Matthias Ettrich
   7  *           Copyright 1995-2001 The LyX Team.
   8  *
   9  * ====================================================== */
  10
  11 #include <config.h>
  12
  13 #include "BufferView.h"
  14 #include "buffer.h"
  15 #include "lyxcursor.h"
  16 #include "lyxtext.h"
  17 #include "frontends/LyXView.h"
  18 #include "bufferlist.h"
  19 #include "frontends/screen.h"
  20 #include "LaTeX.h"
  21 #include "BufferView_pimpl.h"
  22 #include "language.h"
  23 #include "gettext.h"
  24 #include "undo_funcs.h"
  25 #include "debug.h"
  26 #include "iterators.h"
  27 #include "lyxlex.h"
  28 #include "WordLangTuple.h"
  29
  30 #include "frontends/Alert.h"
  31 #include "frontends/Dialogs.h"
  32
  33 #include "insets/insetcommand.h" //ChangeRefs
  34 #include "insets/inseterror.h"
  35
  36 #include "support/FileInfo.h"
  37 #include "support/filetools.h"
  38 #include "support/lyxfunctional.h" //equal_1st_in_pair
  39 #include "support/types.h"
  40 #include "support/lyxalgo.h" // lyx_count
  41
  42 #include <fstream>
  43
  44 extern BufferList bufferlist;
  45
  46 using lyx::pos_type;
  47
  48 using std::pair;
  49 using std::endl;
  50 using std::ifstream;
  51 using std::vector;
  52 using std::find;
  53 using std::count_if;
  54
  55
  56 // Inserts a file into current document
  57 bool BufferView::insertLyXFile(string const & filen)
  58         //
  59         // Copyright CHT Software Service GmbH
  60         // Uwe C. Schroeder
  61         //
  62         // Insert a LyXformat - file into current buffer
  63         //
  64         // Moved from lyx_cb.C (Lgb)
  65 {
  66         if (filen.empty())
  67                 return false;
  68
  69         string const fname = MakeAbsPath(filen);
  70
  71         // check if file exist
  72         FileInfo const fi(fname);
  73
  74         if (!fi.readable()) {
  75                 Alert::alert(_("Error!"),
  76                            _("Specified file is unreadable: "),
  77                            MakeDisplayPath(fname, 50));
  78                 return false;
  79         }
  80
  81         beforeChange(text);
  82
  83         ifstream ifs(fname.c_str());
  84         if (!ifs) {
  85                 Alert::alert(_("Error!"),
  86                            _("Cannot open specified file: "),
  87                            MakeDisplayPath(fname, 50));
  88                 return false;
  89         }
  90
  91         int const c = ifs.peek();
  92
  93         LyXLex lex(0, 0);
  94         lex.setStream(ifs);
  95
  96         bool res = true;
  97
  98         if (c == '#') {
  99                 lyxerr[Debug::INFO] << "Will insert file with header" << endl;
 100                 res = buffer()->readFile(lex, text->cursor.par());
 101         } else {
 102                 lyxerr[Debug::INFO] << "Will insert file without header"
 103                                     << endl;
 104                 res = buffer()->readLyXformat2(lex, text->cursor.par());
 105         }
 106
 107         resize();
 108         return res;
 109 }
 110
 111
 112 bool BufferView::removeAutoInsets()
 113 {
 114         // keep track of which pos and par the cursor was on
 115         Paragraph * cursor_par = text->cursor.par();
 116         Paragraph * cursor_par_prev = cursor_par ? cursor_par->previous() : 0;
 117         Paragraph * cursor_par_next = cursor_par ? cursor_par->next() : 0;
 118         pos_type cursor_pos = text->cursor.pos();
 119
 120         bool found = false;
 121
 122         // Trap the deletion of the paragraph the cursor is in.
 123         // Iterate until we find a paragraph that won't be immediately deleted.
 124         // In reality this should mean we only execute the body of the while
 125         // loop once at most.  However for safety we iterate rather than just
 126         // make this an if () conditional.
 127         while ((cursor_par_prev || cursor_par_next)
 128                && text->setCursor(this,
 129                                   cursor_par_prev ? cursor_par_prev : cursor_par_next,
 130                                   0)) {
 131                 // We just removed cursor_par so have to fix the "cursor"
 132                 if (cursor_par_prev) {
 133                         // '.' = cursor_par
 134                         //  a -> a.
 135                         // .
 136                         cursor_par = cursor_par_prev;
 137                         cursor_pos = cursor_par->size();
 138                 } else {
 139                         // .  -> .a
 140                         //  a
 141                         cursor_par = cursor_par_next;
 142                         cursor_pos = 0;
 143                 }
 144                 cursor_par_prev = cursor_par->previous();
 145                 cursor_par_next = cursor_par->next();
 146         }
 147
 148         // Iterate through the paragraphs removing autoDelete insets as we go.
 149         // If the paragraph ends up empty after all the autoDelete insets are
 150         // removed that paragraph will be removed by the next setCursor() call.
 151         ParIterator it = buffer()->par_iterator_begin();
 152         ParIterator end = buffer()->par_iterator_end();
 153         for (; it != end; ++it) {
 154                 Paragraph * par = *it;
 155                 Paragraph * par_prev = par ? par->previous() : 0;
 156                 bool removed = false;
 157
 158                 if (text->setCursor(this, par, 0)
 159                     && cursor_par == par_prev) {
 160                         // The previous setCursor line was deleted and that
 161                         // was the cursor_par line.  This can only happen if an
 162                         // error box was the sole item on cursor_par.
 163                         // It is possible for cursor_par_prev to be stray if
 164                         // the line it pointed to only had a error box on it
 165                         // so we have to set it to a known correct value.
 166                         // This is often the same value it already had.
 167                         cursor_par_prev = par->previous();
 168                         if (cursor_par_prev) {
 169                                 // '|' = par, '.' = cursor_par, 'E' = error box
 170                                 // First step below may occur before while{}
 171                                 //  a    |a      a     a     a.
 172                                 //  E -> .E -> |.E -> .  -> |b
 173                                 // .      b      b    |b
 174                                 //  b
 175                                 cursor_par = cursor_par_prev;
 176                                 cursor_pos = cursor_par_prev->size();
 177                                 cursor_par_prev = cursor_par->previous();
 178                                 // cursor_par_next remains the same
 179                         } else if (cursor_par_next) {
 180                                 // First step below may occur before while{}
 181                                 // .
 182                                 //  E -> |.E -> |.  -> . -> .|a
 183                                 //  a      a      a    |a
 184                                 cursor_par = cursor_par_next;
 185                                 cursor_pos = 0;
 186                                 // cursor_par_prev remains unset
 187                                 cursor_par_next = cursor_par->next();
 188                         } else {
 189                                 // I can't find a way to trigger this
 190                                 // so it should be unreachable code
 191                                 // unless the buffer is corrupted.
 192                                 lyxerr << "BufferView::removeAutoInsets() is bad\n";
 193                         }
 194                 }
 195
 196                 InsetList::iterator pit = par->insetlist.begin();
 197                 InsetList::iterator pend = par->insetlist.end();
 198
 199                 while (pit != pend) {
 200                         if (pit.getInset()->autoDelete()) {
 201                                 removed = true;
 202                                 pos_type const pos = pit.getPos();
 203
 204                                 par->erase(pos);
 205                                 // We just invalidated par's inset iterators so
 206                                 // we get the next valid iterator position
 207                                 pit = par->insetlist.insetIterator(pos);
 208                                 // and ensure we have a valid end iterator.
 209                                 pend = par->insetlist.end();
 210
 211                                 if (cursor_par == par) {
 212                                         // update the saved cursor position
 213                                         if (cursor_pos > pos)
 214                                                 --cursor_pos;
 215                                 }
 216                         } else {
 217                                 ++pit;
 218                         }
 219                 }
 220                 if (removed) {
 221                         found = true;
 222                         text->redoParagraph(this);
 223                 }
 224         }
 225
 226         // It is possible that the last line is empty if it was cursor_par
 227         // and/or only had an error inset on it.  So we set the cursor to the
 228         // start of the doc to force its removal and ensure a valid saved cursor
 229         if (text->setCursor(this, text->ownerParagraph(), 0)
 230             && 0 == cursor_par_next) {
 231                 cursor_par = cursor_par_prev;
 232                 cursor_pos = cursor_par->size();
 233         } else if (cursor_pos > cursor_par->size()) {
 234                 // Some C-Enter lines were removed by the setCursor call which
 235                 // then invalidated cursor_pos. It could still be "wrong" because
 236                 // the cursor may appear to have jumped but since we collapsed
 237                 // some C-Enter lines this should be a reasonable compromise.
 238                 cursor_pos = cursor_par->size();
 239         }
 240
 241         // restore the original cursor in its corrected location.
 242         text->setCursorIntern(this, cursor_par, cursor_pos);
 243
 244         return found;
 245 }
 246
 247
 248 void BufferView::insertErrors(TeXErrors & terr)
 249 {
 250         // Save the cursor position
 251         LyXCursor cursor = text->cursor;
 252
 253         TeXErrors::Errors::const_iterator cit = terr.begin();
 254         TeXErrors::Errors::const_iterator end = terr.end();
 255         for (; cit != end; ++cit) {
 256                 string const desctext(cit->error_desc);
 257                 string const errortext(cit->error_text);
 258                 string const msgtxt = desctext + '\n' + errortext;
 259                 int const errorrow = cit->error_in_line;
 260
 261                 // Insert error string for row number
 262                 int tmpid = -1;
 263                 int tmppos = -1;
 264
 265                 if (buffer()->texrow.getIdFromRow(errorrow, tmpid, tmppos)) {
 266                         buffer()->texrow.increasePos(tmpid, tmppos);
 267                 }
 268
 269                 Paragraph * texrowpar = 0;
 270
 271                 if (tmpid == -1) {
 272                         texrowpar = text->ownerParagraph();
 273                         tmppos = 0;
 274                 } else {
 275                         texrowpar = buffer()->getParFromID(tmpid);
 276                 }
 277
 278                 if (texrowpar == 0)
 279                         continue;
 280
 281                 freezeUndo();
 282                 InsetError * new_inset = new InsetError(msgtxt);
 283                 text->setCursorIntern(this, texrowpar, tmppos);
 284                 text->insertInset(this, new_inset);
 285                 text->fullRebreak(this);
 286                 unFreezeUndo();
 287         }
 288         // Restore the cursor position
 289         text->setCursorIntern(this, cursor.par(), cursor.pos());
 290 }
 291
 292
 293 void BufferView::setCursorFromRow(int row)
 294 {
 295         int tmpid = -1;
 296         int tmppos = -1;
 297
 298         buffer()->texrow.getIdFromRow(row, tmpid, tmppos);
 299
 300         Paragraph * texrowpar;
 301
 302         if (tmpid == -1) {
 303                 texrowpar = text->ownerParagraph();
 304                 tmppos = 0;
 305         } else {
 306                 texrowpar = buffer()->getParFromID(tmpid);
 307         }
 308         text->setCursor(this, texrowpar, tmppos);
 309 }
 310
 311
 312 bool BufferView::insertInset(Inset * inset, string const & lout)
 313 {
 314         return pimpl_->insertInset(inset, lout);
 315 }
 316
 317
 318 // This is also a buffer property (ale)
 319 // Not so sure about that. a goto Label function can not be buffer local, just
 320 // think how this will work in a multiwindow/buffer environment, all the
 321 // cursors in all the views showing this buffer will move. (Lgb)
 322 // OK, then no cursor action should be allowed in buffer. (ale)
 323 bool BufferView::gotoLabel(string const & label)
 324 {
 325         for (Buffer::inset_iterator it = buffer()->inset_iterator_begin();
 326              it != buffer()->inset_iterator_end(); ++it) {
 327                 vector<string> labels = it->getLabelList();
 328                 if (find(labels.begin(),labels.end(),label)
 329                      != labels.end()) {
 330                         beforeChange(text);
 331                         text->setCursor(this, it.getPar(), it.getPos());
 332                         text->selection.cursor = text->cursor;
 333                         update(text, BufferView::SELECT|BufferView::FITCUR);
 334                         return true;
 335                 }
 336         }
 337         return false;
 338 }
 339
 340
 341 void BufferView::menuUndo()
 342 {
 343         if (!available())
 344                 return;
 345
 346         owner()->message(_("Undo"));
 347         hideCursor();
 348         beforeChange(text);
 349         update(text, BufferView::SELECT|BufferView::FITCUR);
 350         if (!textUndo(this))
 351                 owner()->message(_("No further undo information"));
 352         else
 353                 update(text, BufferView::SELECT|BufferView::FITCUR|BufferView::CHANGE);
 354         switchKeyMap();
 355 }
 356
 357
 358 void BufferView::menuRedo()
 359 {
 360         if (!available())
 361                 return;
 362
 363         owner()->message(_("Redo"));
 364         hideCursor();
 365         beforeChange(text);
 366         update(text, BufferView::SELECT|BufferView::FITCUR);
 367         if (!textRedo(this))
 368                 owner()->message(_("No further redo information"));
 369         else
 370                 update(text, BufferView::SELECT|BufferView::FITCUR|BufferView::CHANGE);
 371         switchKeyMap();
 372 }
 373
 374
 375 void BufferView::copyEnvironment()
 376 {
 377         if (available()) {
 378                 text->copyEnvironmentType();
 379                 owner()->message(_("Paragraph environment type copied"));
 380         }
 381 }
 382
 383
 384 void BufferView::pasteEnvironment()
 385 {
 386         if (available()) {
 387                 text->pasteEnvironmentType(this);
 388                 owner()->message(_("Paragraph environment type set"));
 389                 update(text, BufferView::SELECT|BufferView::FITCUR|BufferView::CHANGE);
 390         }
 391 }
 392
 393
 394 void BufferView::copy()
 395 {
 396         if (available()) {
 397                 getLyXText()->copySelection(this);
 398                 owner()->message(_("Copy"));
 399         }
 400 }
 401
 402
 403 void BufferView::cut(bool realcut)
 404 {
 405         if (available()) {
 406                 hideCursor();
 407                 update(text, BufferView::SELECT|BufferView::FITCUR);
 408                 text->cutSelection(this, true, realcut);
 409                 update(text, BufferView::SELECT|BufferView::FITCUR|BufferView::CHANGE);
 410                 owner()->message(_("Cut"));
 411         }
 412 }
 413
 414
 415 void BufferView::paste()
 416 {
 417         if (!available())
 418                 return;
 419
 420         owner()->message(_("Paste"));
 421
 422         hideCursor();
 423         // clear the selection
 424         toggleSelection();
 425         text->clearSelection();
 426         update(text, BufferView::SELECT|BufferView::FITCUR);
 427
 428         // paste
 429         text->pasteSelection(this);
 430         // bug 393
 431         text->clearSelection();
 432         update(text, BufferView::SELECT|BufferView::FITCUR|BufferView::CHANGE);
 433 // why fake a selection only I think it should be a real one and not only
 434 // a painted one (Jug 20020318).
 435 #if 0
 436         // clear the selection
 437         toggleSelection();
 438         text->clearSelection();
 439         update(text, BufferView::SELECT|BufferView::FITCUR);
 440 #endif
 441 }
 442
 443
 444 /* these functions are for the spellchecker */
 445 WordLangTuple const BufferView::nextWord(float & value)
 446 {
 447         if (!available()) {
 448                 value = 1;
 449                 return WordLangTuple();
 450         }
 451
 452         return text->selectNextWordToSpellcheck(this, value);
 453 }
 454
 455
 456 void BufferView::selectLastWord()
 457 {
 458         if (!available())
 459                 return;
 460
 461         LyXCursor cur = text->selection.cursor;
 462         hideCursor();
 463         beforeChange(text);
 464         text->selection.cursor = cur;
 465         text->selectSelectedWord(this);
 466         toggleSelection(false);
 467         update(text, BufferView::SELECT|BufferView::FITCUR);
 468 }
 469
 470
 471 void BufferView::endOfSpellCheck()
 472 {
 473         if (!available()) return;
 474
 475         hideCursor();
 476         beforeChange(text);
 477         text->selectSelectedWord(this);
 478         text->clearSelection();
 479         update(text, BufferView::SELECT|BufferView::FITCUR);
 480 }
 481
 482
 483 void BufferView::replaceWord(string const & replacestring)
 484 {
 485         if (!available())
 486                 return;
 487
 488         LyXText * tt = getLyXText();
 489         hideCursor();
 490         update(tt, BufferView::SELECT|BufferView::FITCUR);
 491
 492         // clear the selection (if there is any)
 493         toggleSelection(false);
 494         update(tt, BufferView::SELECT|BufferView::FITCUR);
 495
 496         // clear the selection (if there is any)
 497         toggleSelection(false);
 498         tt->replaceSelectionWithString(this, replacestring);
 499
 500         tt->setSelectionOverString(this, replacestring);
 501
 502         // Go back so that replacement string is also spellchecked
 503         for (string::size_type i = 0; i < replacestring.length() + 1; ++i) {
 504                 tt->cursorLeft(this);
 505         }
 506         update(tt, BufferView::SELECT|BufferView::FITCUR|BufferView::CHANGE);
 507 }
 508 // End of spellchecker stuff
 509
 510
 511 bool BufferView::lockInset(UpdatableInset * inset)
 512 {
 513         if (!inset)
 514                 return false;
 515         // don't relock if we're already locked
 516         if (theLockingInset() == inset)
 517                 return true;
 518         if (!theLockingInset()) {
 519                 // first check if it's the inset under the cursor we want lock
 520                 // should be most of the time
 521                 char const c = text->cursor.par()->getChar(text->cursor.pos());
 522                 if (c == Paragraph::META_INSET) {
 523                         Inset * in = text->cursor.par()->getInset(text->cursor.pos());
 524                         if (inset == in) {
 525                                 theLockingInset(inset);
 526                                 return true;
 527                         }
 528                 }
 529                 // Then do a deep look of the inset and lock the right one
 530                 int const id = inset->id();
 531                 ParagraphList::iterator pit = buffer()->paragraphs.begin();
 532                 ParagraphList::iterator pend = buffer()->paragraphs.end();
 533                 for (; pit != pend; ++pit) {
 534                         InsetList::iterator it = pit->insetlist.begin();
 535                         InsetList::iterator end = pit->insetlist.end();
 536                         for (; it != end; ++it) {
 537                                 if (it.getInset() == inset) {
 538                                         text->setCursorIntern(this, &*pit, it.getPos());
 539                                         theLockingInset(inset);
 540                                         return true;
 541                                 }
 542                                 if (it.getInset()->getInsetFromID(id)) {
 543                                         text->setCursorIntern(this, &*pit, it.getPos());
 544                                         it.getInset()->edit(this);
 545                                         return theLockingInset()->lockInsetInInset(this, inset);
 546                                 }
 547                         }
 548                 }
 549                 return false;
 550         }
 551         return theLockingInset()->lockInsetInInset(this, inset);
 552 }
 553
 554
 555 void BufferView::showLockedInsetCursor(int x, int y, int asc, int desc)
 556 {
 557         if (available() && theLockingInset() && !theLockingInset()->nodraw()) {
 558                 LyXCursor cursor = text->cursor;
 559                 Inset * locking_inset = theLockingInset()->getLockingInset();
 560
 561                 if ((cursor.pos() - 1 >= 0) &&
 562                     cursor.par()->isInset(cursor.pos() - 1) &&
 563                     (cursor.par()->getInset(cursor.pos() - 1) ==
 564                      locking_inset))
 565                         text->setCursor(this, cursor,
 566                                         cursor.par(), cursor.pos() - 1);
 567                 LyXScreen::Cursor_Shape shape = LyXScreen::BAR_SHAPE;
 568                 LyXText * txt = getLyXText();
 569                 if (locking_inset->isTextInset() &&
 570                     locking_inset->lyxCode() != Inset::ERT_CODE &&
 571                     (txt->real_current_font.language() !=
 572                      buffer()->params.language
 573                      || txt->real_current_font.isVisibleRightToLeft()
 574                      != buffer()->params.language->RightToLeft()))
 575                         shape = (txt->real_current_font.isVisibleRightToLeft())
 576                                 ? LyXScreen::REVERSED_L_SHAPE
 577                                 : LyXScreen::L_SHAPE;
 578                 y += cursor.iy() + theLockingInset()->insetInInsetY();
 579                 screen().showManualCursor(text, x, y, asc, desc,
 580                                                   shape);
 581         }
 582 }
 583
 584
 585 void BufferView::hideLockedInsetCursor()
 586 {
 587         if (theLockingInset() && available()) {
 588                 screen().hideCursor();
 589         }
 590 }
 591
 592
 593 bool BufferView::fitLockedInsetCursor(int x, int y, int asc, int desc)
 594 {
 595         if (theLockingInset() && available()) {
 596                 y += text->cursor.iy() + theLockingInset()->insetInInsetY();
 597                 if (screen().fitManualCursor(this, text, x, y, asc, desc)) {
 598                         updateScrollbar();
 599                         return true;
 600                 }
 601         }
 602         return false;
 603 }
 604
 605
 606 int BufferView::unlockInset(UpdatableInset * inset)
 607 {
 608         if (!inset)
 609                 return 0;
 610         if (inset && theLockingInset() == inset) {
 611                 inset->insetUnlock(this);
 612                 theLockingInset(0);
 613                 // make sure we update the combo !
 614                 owner()->setLayout(getLyXText()->cursor.par()->layout()->name());
 615                 // Tell the paragraph dialog that we changed paragraph
 616                 owner()->getDialogs().updateParagraph();
 617                 finishUndo();
 618                 return 0;
 619         } else if (inset && theLockingInset() &&
 620                    theLockingInset()->unlockInsetInInset(this, inset)) {
 621                 // Tell the paragraph dialog that we changed paragraph
 622                 owner()->getDialogs().updateParagraph();
 623                 // owner inset has updated the layout combo
 624                 finishUndo();
 625                 return 0;
 626         }
 627         return bufferlist.unlockInset(inset);
 628 }
 629
 630
 631 void BufferView::lockedInsetStoreUndo(Undo::undo_kind kind)
 632 {
 633         if (!theLockingInset())
 634                 return; // shouldn't happen
 635         if (kind == Undo::EDIT) // in this case insets would not be stored!
 636                 kind = Undo::FINISH;
 637         setUndo(this, kind,
 638                 text->cursor.par(),
 639                 text->cursor.par()->next());
 640 }
 641
 642
 643 void BufferView::updateInset(Inset * inset, bool mark_dirty)
 644 {
 645         pimpl_->updateInset(inset, mark_dirty);
 646 }
 647
 648
 649 bool BufferView::ChangeInsets(Inset::Code code,
 650                               string const & from, string const & to)
 651 {
 652         bool need_update = false;
 653         LyXCursor cursor = text->cursor;
 654         LyXCursor tmpcursor = cursor;
 655         cursor.par(tmpcursor.par());
 656         cursor.pos(tmpcursor.pos());
 657
 658         ParIterator end = buffer()->par_iterator_end();
 659         for (ParIterator it = buffer()->par_iterator_begin();
 660              it != end; ++it) {
 661                 Paragraph * par = *it;
 662                 bool changed_inset = false;
 663                 for (InsetList::iterator it2 = par->insetlist.begin();
 664                      it2 != par->insetlist.end(); ++it2) {
 665                         if (it2.getInset()->lyxCode() == code) {
 666                                 InsetCommand * inset = static_cast<InsetCommand *>(it2.getInset());
 667                                 if (inset->getContents() == from) {
 668                                         inset->setContents(to);
 669                                         changed_inset = true;
 670                                 }
 671                         }
 672                 }
 673                 if (changed_inset) {
 674                         need_update = true;
 675
 676                         // FIXME
 677
 678                         // The test it.size()==1 was needed to prevent crashes.
 679                         // How to set the cursor corretly when it.size()>1 ??
 680                         if (it.size() == 1) {
 681                                 text->setCursorIntern(this, par, 0);
 682                                 text->redoParagraphs(this, text->cursor,
 683                                                      text->cursor.par()->next());
 684                                 text->fullRebreak(this);
 685                         }
 686                 }
 687         }
 688         text->setCursorIntern(this, cursor.par(), cursor.pos());
 689         return need_update;
 690 }
 691
 692
 693 bool BufferView::ChangeRefsIfUnique(string const & from, string const & to)
 694 {
 695         // Check if the label 'from' appears more than once
 696         vector<string> labels = buffer()->getLabelList();
 697
 698         if (lyx::count(labels.begin(), labels.end(), from) > 1)
 699                 return false;
 700
 701         return ChangeInsets(Inset::REF_CODE, from, to);
 702 }
 703
 704
 705 bool BufferView::ChangeCitationsIfUnique(string const & from,
 706                                          string const & to)
 707 {
 708         typedef pair<string, string> StringPair;
 709
 710         vector<StringPair> keys = buffer()->getBibkeyList();
 711         if (count_if(keys.begin(), keys.end(),
 712                      lyx::equal_1st_in_pair<StringPair>(from))
 713             > 1)
 714                 return false;
 715
 716         return ChangeInsets(Inset::CITE_CODE, from, to);
 717 }
 718
 719
 720 UpdatableInset * BufferView::theLockingInset() const
 721 {
 722         // If NULL is not allowed we should put an Assert here. (Lgb)
 723         if (text)
 724                 return text->the_locking_inset;
 725         return 0;
 726 }
 727
 728
 729 void BufferView::theLockingInset(UpdatableInset * inset)
 730 {
 731         text->the_locking_inset = inset;
 732 }
 733
 734
 735 LyXText * BufferView::getLyXText() const
 736 {
 737         if (theLockingInset()) {
 738                 LyXText * txt = theLockingInset()->getLyXText(this, true);
 739                 if (txt)
 740                         return txt;
 741         }
 742         return text;
 743 }
 744
 745
 746 LyXText * BufferView::getParentText(Inset * inset) const
 747 {
 748         if (inset->owner()) {
 749                 LyXText * txt = inset->getLyXText(this);
 750                 inset = inset->owner();
 751                 while (inset && inset->getLyXText(this) == txt)
 752                         inset = inset->owner();
 753                 if (inset)
 754                         return inset->getLyXText(this);
 755         }
 756         return text;
 757 }
 758
 759
 760 Language const * BufferView::getParentLanguage(Inset * inset) const
 761 {
 762         LyXText * text = getParentText(inset);
 763         return text->cursor.par()->getFontSettings(buffer()->params,
 764                                                    text->cursor.pos()).language();
 765 }