src/CutAndPaste.C

   1 /*
   2  * \file CutAndPaste.C
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Jürgen Vigna
   7  * \author Lars Gullik Bjønnes
   8  * \author Alfredo Braunstein
   9  *
  10  * Full author contact details are available in file CREDITS.
  11  */
  12
  13 #include <config.h>
  14
  15 #include "CutAndPaste.h"
  16
  17 #include "buffer.h"
  18 #include "buffer_funcs.h"
  19 #include "bufferparams.h"
  20 #include "BufferView.h"
  21 #include "cursor.h"
  22 #include "debug.h"
  23 #include "errorlist.h"
  24 #include "funcrequest.h"
  25 #include "gettext.h"
  26 #include "lfuns.h"
  27 #include "lyxrc.h"
  28 #include "lyxtext.h"
  29 #include "lyxtextclasslist.h"
  30 #include "paragraph.h"
  31 #include "paragraph_funcs.h"
  32 #include "ParagraphParameters.h"
  33 #include "ParagraphList_fwd.h"
  34 #include "pariterator.h"
  35 #include "undo.h"
  36
  37 #include "insets/insettabular.h"
  38
  39 #include "mathed/math_data.h"
  40 #include "mathed/math_inset.h"
  41 #include "mathed/math_support.h"
  42
  43 #include "support/lstrings.h"
  44
  45 #include <boost/tuple/tuple.hpp>
  46
  47 using lyx::pos_type;
  48 using lyx::pit_type;
  49 using lyx::textclass_type;
  50
  51 using lyx::support::bformat;
  52
  53 using std::endl;
  54 using std::for_each;
  55 using std::make_pair;
  56 using std::pair;
  57 using std::vector;
  58 using std::string;
  59
  60
  61 namespace {
  62
  63 typedef std::pair<lyx::pit_type, int> PitPosPair;
  64
  65 typedef limited_stack<pair<ParagraphList, textclass_type> > CutStack;
  66
  67 CutStack theCuts(10);
  68
  69 class resetOwnerAndChanges : public std::unary_function<Paragraph, void> {
  70 public:
  71         void operator()(Paragraph & p) const {
  72                 p.cleanChanges();
  73                 p.setInsetOwner(0);
  74         }
  75 };
  76
  77
  78 void region(CursorSlice const & i1, CursorSlice const & i2,
  79         InsetBase::row_type & r1, InsetBase::row_type & r2,
  80         InsetBase::col_type & c1, InsetBase::col_type & c2)
  81 {
  82         InsetBase & p = i1.inset();
  83         c1 = p.col(i1.idx());
  84         c2 = p.col(i2.idx());
  85         if (c1 > c2)
  86                 std::swap(c1, c2);
  87         r1 = p.row(i1.idx());
  88         r2 = p.row(i2.idx());
  89         if (r1 > r2)
  90                 std::swap(r1, r2);
  91 }
  92
  93
  94 bool checkPastePossible(int index)
  95 {
  96         return size_t(index) < theCuts.size() && !theCuts[index].first.empty();
  97 }
  98
  99
 100 pair<PitPosPair, pit_type>
 101 pasteSelectionHelper(Buffer const & buffer, ParagraphList & pars,
 102         pit_type pit, int pos,
 103         textclass_type tc, size_t cut_index, ErrorList & errorlist)
 104 {
 105         if (!checkPastePossible(cut_index))
 106                 return make_pair(PitPosPair(pit, pos), pit);
 107
 108         BOOST_ASSERT (pos <= pars[pit].size());
 109
 110         // Make a copy of the CaP paragraphs.
 111         ParagraphList insertion = theCuts[cut_index].first;
 112         textclass_type const textclass = theCuts[cut_index].second;
 113
 114         // Now remove all out of the pars which is NOT allowed in the
 115         // new environment and set also another font if that is required.
 116
 117         // Convert newline to paragraph break in ERT inset.
 118         // This should not be here!
 119         if (pars[pit].inInset()->lyxCode() == InsetBase::ERT_CODE) {
 120                 for (ParagraphList::size_type i = 0; i < insertion.size(); ++i) {
 121                         for (pos_type j = 0; j < insertion[i].size(); ++j) {
 122                                 if (insertion[i].isNewline(j)) {
 123                                         insertion[i].erase(j);
 124                                         breakParagraphConservative(
 125                                                         buffer.params(),
 126                                                         insertion, i, j);
 127                                 }
 128                         }
 129                 }
 130         }
 131
 132         // Make sure there is no class difference.
 133         lyx::cap::SwitchLayoutsBetweenClasses(textclass, tc, insertion,
 134                                     errorlist);
 135
 136         ParagraphList::iterator tmpbuf = insertion.begin();
 137         int depth_delta = pars[pit].params().depth() - tmpbuf->params().depth();
 138
 139         Paragraph::depth_type max_depth = pars[pit].getMaxDepthAfter();
 140
 141         for (; tmpbuf != insertion.end(); ++tmpbuf) {
 142                 // If we have a negative jump so that the depth would
 143                 // go below 0 depth then we have to redo the delta to
 144                 // this new max depth level so that subsequent
 145                 // paragraphs are aligned correctly to this paragraph
 146                 // at level 0.
 147                 if (int(tmpbuf->params().depth()) + depth_delta < 0)
 148                         depth_delta = 0;
 149
 150                 // Set the right depth so that we are not too deep or shallow.
 151                 tmpbuf->params().depth(tmpbuf->params().depth() + depth_delta);
 152                 if (tmpbuf->params().depth() > max_depth)
 153                         tmpbuf->params().depth(max_depth);
 154
 155                 // Only set this from the 2nd on as the 2nd depends
 156                 // for maxDepth still on pit.
 157                 if (tmpbuf != insertion.begin())
 158                         max_depth = tmpbuf->getMaxDepthAfter();
 159
 160                 // Set the inset owner of this paragraph.
 161                 tmpbuf->setInsetOwner(pars[pit].inInset());
 162                 for (pos_type i = 0; i < tmpbuf->size(); ++i) {
 163                         if (tmpbuf->getChar(i) == Paragraph::META_INSET &&
 164                             !pars[pit].insetAllowed(tmpbuf->getInset(i)->lyxCode()))
 165                                 tmpbuf->erase(i--);
 166                 }
 167         }
 168
 169         bool const empty = pars[pit].empty();
 170         if (!empty) {
 171                 // Make the buf exactly the same layout as the cursor
 172                 // paragraph.
 173                 insertion.begin()->makeSameLayout(pars[pit]);
 174         }
 175
 176         // Prepare the paragraphs and insets for insertion.
 177         // A couple of insets store buffer references so need updating.
 178         InsetText in;
 179         std::swap(in.paragraphs(), insertion);
 180
 181         ParIterator fpit = par_iterator_begin(in);
 182         ParIterator fend = par_iterator_end(in);
 183
 184         for (; fpit != fend; ++fpit) {
 185                 InsetList::iterator lit = fpit->insetlist.begin();
 186                 InsetList::iterator eit = fpit->insetlist.end();
 187
 188                 for (; lit != eit; ++lit) {
 189                         switch (lit->inset->lyxCode()) {
 190                         case InsetBase::TABULAR_CODE: {
 191                                 InsetTabular * it = static_cast<InsetTabular*>(lit->inset);
 192                                 it->buffer(&buffer);
 193                                 break;
 194                         }
 195
 196                         default:
 197                                 break; // nothing
 198                         }
 199                 }
 200         }
 201         std::swap(in.paragraphs(), insertion);
 202
 203         // Split the paragraph for inserting the buf if necessary.
 204         if (!empty)
 205                 breakParagraphConservative(buffer.params(), pars, pit, pos);
 206
 207         // Paste it!
 208         if (empty) {
 209                 pars.insert(pars.begin() + pit, insertion.begin(),
 210                             insertion.end());
 211
 212                 // merge the empty par with the last par of the insertion
 213                 mergeParagraph(buffer.params(), pars,
 214                                pit + insertion.size() - 1);
 215         } else {
 216                 pars.insert(pars.begin() + pit + 1, insertion.begin(),
 217                             insertion.end());
 218
 219                 // merge the first par of the insertion with the current par
 220                 mergeParagraph(buffer.params(), pars, pit);
 221         }
 222
 223         pit_type last_paste = pit + insertion.size() - 1;
 224
 225         // Store the new cursor position.
 226         pit = last_paste;
 227         pos = pars[last_paste].size();
 228
 229         // Maybe some pasting.
 230         if (!empty && last_paste + 1 != pit_type(pars.size())) {
 231                 if (pars[last_paste + 1].hasSameLayout(pars[last_paste])) {
 232                         mergeParagraph(buffer.params(), pars, last_paste);
 233                 } else if (pars[last_paste + 1].empty()) {
 234                         pars[last_paste + 1].makeSameLayout(pars[last_paste]);
 235                         mergeParagraph(buffer.params(), pars, last_paste);
 236                 } else if (pars[last_paste].empty()) {
 237                         pars[last_paste].makeSameLayout(pars[last_paste + 1]);
 238                         mergeParagraph(buffer.params(), pars, last_paste);
 239                 } else {
 240                         pars[last_paste + 1].stripLeadingSpaces();
 241                         ++last_paste;
 242                 }
 243         }
 244
 245         return make_pair(PitPosPair(pit, pos), last_paste + 1);
 246 }
 247
 248
 249 PitPosPair eraseSelectionHelper(BufferParams const & params,
 250         ParagraphList & pars,
 251         pit_type startpit, pit_type endpit,
 252         int startpos, int endpos, bool doclear)
 253 {
 254         if (startpit == pit_type(pars.size()) ||
 255             (startpos > pars[startpit].size()))
 256                 return PitPosPair(endpit, endpos);
 257
 258         if (endpit == pit_type(pars.size()) ||
 259             startpit == endpit) {
 260                 endpos -= pars[startpit].erase(startpos, endpos);
 261                 return PitPosPair(endpit, endpos);
 262         }
 263
 264         // clear end/begin fragments of the first/last par in selection
 265         bool all_erased = true;
 266
 267         pars[startpit].erase(startpos, pars[startpit].size());
 268         if (pars[startpit].size() != startpos)
 269                 all_erased = false;
 270
 271         endpos -= pars[endpit].erase(0, endpos);
 272         if (endpos != 0)
 273                 all_erased = false;
 274
 275         // Loop through the deleted pars if any, erasing as needed
 276         for (pit_type pit = startpit + 1; pit != endpit;) {
 277                 // "erase" the contents of the par
 278                 pars[pit].erase(0, pars[pit].size());
 279                 if (!pars[pit].size()) {
 280                         // remove the par if it's now empty
 281                         pars.erase(pars.begin() + pit);
 282                         --endpit;
 283                 } else {
 284                         ++pit;
 285                         all_erased = false;
 286                 }
 287         }
 288
 289 #if 0 // FIXME: why for cut but not copy ?
 290         // the cut selection should begin with standard layout
 291         if (realcut) {
 292                 buf->params().clear();
 293                 buf->bibkey = 0;
 294                 buf->layout(textclasslist[buffer->params.textclass].defaultLayoutName());
 295         }
 296 #endif
 297
 298         if (startpit + 1 == pit_type(pars.size()))
 299                 return PitPosPair(endpit, endpos);
 300
 301         if (doclear) {
 302                 pars[startpit + 1].stripLeadingSpaces();
 303         }
 304
 305         // paste the paragraphs again, if possible
 306         if (all_erased &&
 307             (pars[startpit].hasSameLayout(pars[startpit + 1]) ||
 308              pars[startpit + 1].empty())) {
 309                 mergeParagraph(params, pars, startpit);
 310                 // this because endpar gets deleted here!
 311                 endpit = startpit;
 312                 endpos = startpos;
 313         }
 314
 315         return PitPosPair(endpit, endpos);
 316
 317 }
 318
 319
 320 void copySelectionHelper(ParagraphList & pars,
 321         pit_type startpit, pit_type endpit,
 322         int start, int end, textclass_type tc)
 323 {
 324         BOOST_ASSERT(0 <= start && start <= pars[startpit].size());
 325         BOOST_ASSERT(0 <= end && end <= pars[endpit].size());
 326         BOOST_ASSERT(startpit != endpit || start <= end);
 327
 328         // Clone the paragraphs within the selection.
 329         ParagraphList paragraphs(pars.begin() + startpit, pars.begin() + endpit + 1);
 330         for_each(paragraphs.begin(), paragraphs.end(), resetOwnerAndChanges());
 331
 332         // Cut out the end of the last paragraph.
 333         Paragraph & back = paragraphs.back();
 334         back.erase(end, back.size());
 335
 336         // Cut out the begin of the first paragraph
 337         Paragraph & front = paragraphs.front();
 338         front.erase(0, start);
 339
 340         theCuts.push(make_pair(paragraphs, tc));
 341 }
 342
 343
 344
 345 PitPosPair cutSelectionHelper(BufferParams const & params,
 346         ParagraphList & pars, pit_type startpit, pit_type endpit,
 347         int startpos, int endpos, textclass_type tc, bool doclear)
 348 {
 349         copySelectionHelper(pars, startpit, endpit, startpos, endpos, tc);
 350         return eraseSelectionHelper(params, pars, startpit, endpit,
 351                 startpos, endpos, doclear);
 352 }
 353
 354
 355 } // namespace anon
 356
 357
 358
 359
 360 namespace lyx {
 361 namespace cap {
 362
 363 string grabAndEraseSelection(LCursor & cur)
 364 {
 365         if (!cur.selection())
 366                 return string();
 367         string res = grabSelection(cur);
 368         eraseSelection(cur);
 369         cur.selection() = false;
 370         return res;
 371 }
 372
 373
 374 int SwitchLayoutsBetweenClasses(textclass_type c1, textclass_type c2,
 375         ParagraphList & pars, ErrorList & errorlist)
 376 {
 377         BOOST_ASSERT(!pars.empty());
 378         int ret = 0;
 379         if (c1 == c2)
 380                 return ret;
 381
 382         LyXTextClass const & tclass1 = textclasslist[c1];
 383         LyXTextClass const & tclass2 = textclasslist[c2];
 384
 385         InsetText in;
 386         std::swap(in.paragraphs(), pars);
 387
 388         ParIterator end = par_iterator_end(in);
 389         for (ParIterator it = par_iterator_begin(in); it != end; ++it) {
 390                 string const name = it->layout()->name();
 391                 bool hasLayout = tclass2.hasLayout(name);
 392
 393                 if (hasLayout)
 394                         it->layout(tclass2[name]);
 395                 else
 396                         it->layout(tclass2.defaultLayout());
 397
 398                 if (!hasLayout && name != tclass1.defaultLayoutName()) {
 399                         ++ret;
 400                         string const s = bformat(
 401                                 _("Layout had to be changed from\n%1$s to %2$s\n"
 402                                 "because of class conversion from\n%3$s to %4$s"),
 403                          name, it->layout()->name(), tclass1.name(), tclass2.name());
 404                         // To warn the user that something had to be done.
 405                         errorlist.push_back(ErrorItem("Changed Layout", s,
 406                                                       it->id(), 0,
 407                                                       it->size()));
 408                 }
 409         }
 410         std::swap(in.paragraphs(), pars);
 411         return ret;
 412 }
 413
 414
 415 std::vector<string> const availableSelections(Buffer const & buffer)
 416 {
 417         vector<string> selList;
 418
 419         CutStack::const_iterator cit = theCuts.begin();
 420         CutStack::const_iterator end = theCuts.end();
 421         for (; cit != end; ++cit) {
 422                 // we do not use cit-> here because gcc 2.9x does not
 423                 // like it (JMarc)
 424                 ParagraphList const & pars = (*cit).first;
 425                 string asciiSel;
 426                 ParagraphList::const_iterator pit = pars.begin();
 427                 ParagraphList::const_iterator pend = pars.end();
 428                 for (; pit != pend; ++pit) {
 429                         asciiSel += pit->asString(buffer, false);
 430                         if (asciiSel.size() > 25) {
 431                                 asciiSel.replace(22, string::npos, "...");
 432                                 break;
 433                         }
 434                 }
 435
 436                 selList.push_back(asciiSel);
 437         }
 438
 439         return selList;
 440 }
 441
 442
 443 int nrOfParagraphs()
 444 {
 445         return theCuts.empty() ? 0 : theCuts[0].first.size();
 446 }
 447
 448
 449 void cutSelection(LCursor & cur, bool doclear, bool realcut)
 450 {
 451         if (cur.inTexted()) {
 452                 LyXText * text = cur.text();
 453                 BOOST_ASSERT(text);
 454                 // Stuff what we got on the clipboard. Even if there is no selection.
 455
 456                 // There is a problem with having the stuffing here in that the
 457                 // larger the selection the slower LyX will get. This can be
 458                 // solved by running the line below only when the selection has
 459                 // finished. The solution used currently just works, to make it
 460                 // faster we need to be more clever and probably also have more
 461                 // calls to stuffClipboard. (Lgb)
 462                 cur.bv().stuffClipboard(cur.selectionAsString(true));
 463
 464                 // This doesn't make sense, if there is no selection
 465                 if (!cur.selection())
 466                         return;
 467
 468                 // OK, we have a selection. This is always between cur.selBegin()
 469                 // and cur.selEnd()
 470
 471                 // make sure that the depth behind the selection are restored, too
 472                 recordUndoSelection(cur);
 473                 pit_type begpit = cur.selBegin().pit();
 474                 pit_type endpit = cur.selEnd().pit();
 475
 476                 int endpos = cur.selEnd().pos();
 477
 478                 BufferParams const & bp = cur.buffer().params();
 479                 if (realcut) {
 480                         copySelectionHelper(text->paragraphs(),
 481                                 begpit, endpit,
 482                                 cur.selBegin().pos(), endpos,
 483                                 bp.textclass);
 484                 }
 485
 486                 boost::tie(endpit, endpos) =
 487                         eraseSelectionHelper(bp,
 488                                 text->paragraphs(),
 489                                 begpit, endpit,
 490                                 cur.selBegin().pos(), endpos,
 491                                 doclear);
 492
 493                 // sometimes necessary
 494                 if (doclear)
 495                         text->paragraphs()[begpit].stripLeadingSpaces();
 496
 497                 // cutSelection can invalidate the cursor so we need to set
 498                 // it anew. (Lgb)
 499                 // we prefer the end for when tracking changes
 500                 cur.pos() = endpos;
 501                 cur.pit() = endpit;
 502
 503                 // need a valid cursor. (Lgb)
 504                 cur.clearSelection();
 505                 text->updateCounters();
 506         }
 507
 508         if (cur.inMathed()) {
 509                 lyxerr << "cutSelection in mathed" << endl;
 510                 LCursor tmp = cur;
 511                 copySelection(cur);
 512                 cur.selection() = false;
 513                 eraseSelection(tmp);
 514         }
 515 }
 516
 517
 518 void copySelection(LCursor & cur)
 519 {
 520         // stuff the selection onto the X clipboard, from an explicit copy request
 521         cur.bv().stuffClipboard(cur.selectionAsString(true));
 522
 523         // this doesn't make sense, if there is no selection
 524         if (!cur.selection())
 525                 return;
 526
 527         if (cur.inTexted()) {
 528                 LyXText * text = cur.text();
 529                 BOOST_ASSERT(text);
 530                 // ok we have a selection. This is always between cur.selBegin()
 531                 // and sel_end cursor
 532
 533                 // copy behind a space if there is one
 534                 ParagraphList & pars = text->paragraphs();
 535                 pos_type pos = cur.selBegin().pos();
 536                 pit_type par = cur.selBegin().pit();
 537                 while (pos < pars[par].size()
 538                                          && pars[par].isLineSeparator(pos)
 539                                          && (par != cur.selEnd().pit() || pos < cur.selEnd().pos()))
 540                         ++pos;
 541
 542                 copySelectionHelper(pars, par, cur.selEnd().pit(),
 543                         pos, cur.selEnd().pos(), cur.buffer().params().textclass);
 544         }
 545
 546         if (cur.inMathed()) {
 547                 lyxerr << "copySelection in mathed" << endl;
 548                 ParagraphList pars;
 549                 pars.push_back(Paragraph());
 550                 BufferParams const & bp = cur.buffer().params();
 551                 pars.back().layout(bp.getLyXTextClass().defaultLayout());
 552                 for_each(pars.begin(), pars.end(), resetOwnerAndChanges());
 553                 pars.back().insert(0, grabSelection(cur), LyXFont());
 554                 theCuts.push(make_pair(pars, bp.textclass));
 555         }
 556 }
 557
 558
 559 std::string getSelection(Buffer const & buf, size_t sel_index)
 560 {
 561         return sel_index < theCuts.size()
 562                 ? theCuts[sel_index].first.back().asString(buf, false)
 563                 : string();
 564 }
 565
 566
 567 void pasteSelection(LCursor & cur, size_t sel_index)
 568 {
 569         // this does not make sense, if there is nothing to paste
 570         lyxerr << "#### pasteSelection " << sel_index << endl;
 571         if (!checkPastePossible(sel_index))
 572                 return;
 573
 574         if (cur.inTexted()) {
 575                 LyXText * text = cur.text();
 576                 BOOST_ASSERT(text);
 577
 578                 recordUndo(cur);
 579
 580                 pit_type endpit;
 581                 PitPosPair ppp;
 582
 583                 ErrorList el;
 584
 585                 boost::tie(ppp, endpit) =
 586                         pasteSelectionHelper(cur.buffer(),
 587                                                                 text->paragraphs(),
 588                                                                 cur.pit(), cur.pos(),
 589                                                                 cur.buffer().params().textclass,
 590                                                                 sel_index, el);
 591                 bufferErrors(cur.buffer(), el);
 592                 cur.bv().showErrorList(_("Paste"));
 593
 594                 cur.clearSelection();
 595                 cur.resetAnchor();
 596                 text->setCursor(cur, ppp.first, ppp.second);
 597                 cur.setSelection();
 598                 text->updateCounters();
 599         }
 600
 601         if (cur.inMathed()) {
 602                 lyxerr << "### should be handled in MathNest/GridInset" << endl;
 603         }
 604 }
 605
 606
 607 void setSelectionRange(LCursor & cur, pos_type length)
 608 {
 609         LyXText * text = cur.text();
 610         BOOST_ASSERT(text);
 611         if (!length)
 612                 return;
 613         cur.resetAnchor();
 614         while (length--)
 615                 text->cursorRight(cur);
 616         cur.setSelection();
 617 }
 618
 619
 620 // simple replacing. The font of the first selected character is used
 621 void replaceSelectionWithString(LCursor & cur, string const & str)
 622 {
 623         LyXText * text = cur.text();
 624         BOOST_ASSERT(text);
 625         recordUndo(cur);
 626
 627         // Get font setting before we cut
 628         pos_type pos = cur.selEnd().pos();
 629         Paragraph & par = text->getPar(cur.selEnd().pit());
 630         LyXFont const font =
 631                 par.getFontSettings(cur.buffer().params(), cur.selBegin().pos());
 632
 633         // Insert the new string
 634         string::const_iterator cit = str.begin();
 635         string::const_iterator end = str.end();
 636         for (; cit != end; ++cit, ++pos)
 637                 par.insertChar(pos, (*cit), font);
 638
 639         // Cut the selection
 640         cutSelection(cur, true, false);
 641 }
 642
 643
 644 void replaceSelection(LCursor & cur)
 645 {
 646         if (cur.selection())
 647                 cutSelection(cur, true, false);
 648 }
 649
 650
 651 // only used by the spellchecker
 652 void replaceWord(LCursor & cur, string const & replacestring)
 653 {
 654         LyXText * text = cur.text();
 655         BOOST_ASSERT(text);
 656
 657         replaceSelectionWithString(cur, replacestring);
 658         setSelectionRange(cur, replacestring.length());
 659
 660         // Go back so that replacement string is also spellchecked
 661         for (string::size_type i = 0; i < replacestring.length() + 1; ++i)
 662                 text->cursorLeft(cur);
 663 }
 664
 665
 666 void eraseSelection(LCursor & cur)
 667 {
 668         //lyxerr << "LCursor::eraseSelection begin: " << cur << endl;
 669         CursorSlice const & i1 = cur.selBegin();
 670         CursorSlice const & i2 = cur.selEnd();
 671         if (i1.inset().asMathInset()) {
 672                 if (i1.idx() == i2.idx()) {
 673                         i1.cell().erase(i1.pos(), i2.pos());
 674                 } else {
 675                         MathInset * p = i1.asMathInset();
 676                         InsetBase::row_type r1, r2;
 677                         InsetBase::col_type c1, c2;
 678                         region(i1, i2, r1, r2, c1, c2);
 679                         for (InsetBase::row_type row = r1; row <= r2; ++row)
 680                                 for (InsetBase::col_type col = c1; col <= c2; ++col)
 681                                         p->cell(p->index(row, col)).clear();
 682                 }
 683                 cur.back() = i1;
 684                 cur.pos() = 0; // We've deleted the whole cell. Only pos 0 is valid.
 685                 cur.resetAnchor();
 686         } else {
 687                 lyxerr << "can't erase this selection 1" << endl;
 688         }
 689         //lyxerr << "LCursor::eraseSelection end: " << cur << endl;
 690 }
 691
 692
 693 void selDel(LCursor & cur)
 694 {
 695         //lyxerr << "LCursor::selDel" << endl;
 696         if (cur.selection()) {
 697                 eraseSelection(cur);
 698                 cur.selection() = false;
 699         }
 700 }
 701
 702
 703 void selClearOrDel(LCursor & cur)
 704 {
 705         //lyxerr << "LCursor::selClearOrDel" << endl;
 706         if (lyxrc.auto_region_delete)
 707                 selDel(cur);
 708         else
 709                 cur.selection() = false;
 710 }
 711
 712
 713 string grabSelection(LCursor & cur)
 714 {
 715         if (!cur.selection())
 716                 return string();
 717
 718         CursorSlice i1 = cur.selBegin();
 719         CursorSlice i2 = cur.selEnd();
 720
 721         if (i1.idx() == i2.idx()) {
 722                 if (i1.inset().asMathInset()) {
 723                         MathArray::const_iterator it = i1.cell().begin();
 724                         return asString(MathArray(it + i1.pos(), it + i2.pos()));
 725                 } else {
 726                         return "unknown selection 1";
 727                 }
 728         }
 729
 730         InsetBase::row_type r1, r2;
 731         InsetBase::col_type c1, c2;
 732         region(i1, i2, r1, r2, c1, c2);
 733
 734         string data;
 735         if (i1.inset().asMathInset()) {
 736                 for (InsetBase::row_type row = r1; row <= r2; ++row) {
 737                         if (row > r1)
 738                                 data += "\\\\";
 739                         for (InsetBase::col_type col = c1; col <= c2; ++col) {
 740                                 if (col > c1)
 741                                         data += '&';
 742                                 data += asString(i1.asMathInset()->
 743                                         cell(i1.asMathInset()->index(row, col)));
 744                         }
 745                 }
 746         } else {
 747                 data = "unknown selection 2";
 748         }
 749         return data;
 750 }
 751
 752
 753 } // namespace cap
 754 } // namespace lyx