src/mathed/math_hullinset.C

   1 #include <config.h>
   2
   3 #ifdef __GNUG__
   4 #pragma implementation
   5 #endif
   6
   7 #include "math_hullinset.h"
   8 #include "math_mathmlstream.h"
   9 #include "math_streamstr.h"
  10 #include "math_support.h"
  11 #include "math_extern.h"
  12 #include "math_charinset.h"
  13 #include "debug.h"
  14 #include "textpainter.h"
  15 #include "funcrequest.h"
  16 #include "Lsstream.h"
  17 #include "LaTeXFeatures.h"
  18 #include "support/LAssert.h"
  19 #include "frontends/Painter.h"
  20
  21 #include "frontends/Alert.h"
  22 #include "lyxrc.h"
  23 #include "gettext.h"
  24 #include "BufferView.h"
  25
  26 #include <vector>
  27
  28 using std::vector;
  29 using std::max;
  30 using std::endl;
  31 using std::pair;
  32
  33 namespace {
  34
  35         int getCols(string const & type)
  36         {
  37                 if (type == "eqnarray")
  38                         return 3;
  39                 if (type == "align")
  40                         return 2;
  41                 if (type == "alignat")
  42                         return 2;
  43                 if (type == "xalignat")
  44                         return 2;
  45                 if (type == "xxalignat")
  46                         return 2;
  47                 return 1;
  48         }
  49
  50
  51         // returns position of first relation operator in the array
  52         // used for "intelligent splitting"
  53         MathArray::size_type firstRelOp(MathArray const & ar)
  54         {
  55                 for (MathArray::const_iterator it = ar.begin(); it != ar.end(); ++it)
  56                         if ((*it)->isRelOp())
  57                                 return it - ar.begin();
  58                 return ar.size();
  59         }
  60
  61
  62         char const * star(bool numbered)
  63         {
  64                 return numbered ? "" : "*";
  65         }
  66
  67
  68         int typecode(string const & s)
  69         {
  70                 if (s == "none")      return 0;
  71                 if (s == "simple")    return 1;
  72                 if (s == "equation")  return 2;
  73                 if (s == "eqnarray")  return 3;
  74                 if (s == "align")     return 4;
  75                 if (s == "alignat")   return 5;
  76                 if (s == "xalignat")  return 6;
  77                 if (s == "xxalignat") return 7;
  78                 if (s == "multline")  return 8;
  79                 if (s == "gather")    return 9;
  80                 lyxerr << "unknown hull type '" << s << "'\n";
  81                 return 0;
  82         }
  83
  84         bool smaller(string const & s, string const & t)
  85         {
  86                 return typecode(s) < typecode(t);
  87         }
  88
  89
  90 } // end anon namespace
  91
  92
  93 MathHullInset::MathHullInset()
  94         : MathGridInset(1, 1), type_("none"), nonum_(1), label_(1)
  95 {
  96         setDefaults();
  97 }
  98
  99
 100 MathHullInset::MathHullInset(string const & type)
 101         : MathGridInset(getCols(type), 1), type_(type), nonum_(1), label_(1)
 102 {
 103         setDefaults();
 104 }
 105
 106
 107 MathInset * MathHullInset::clone() const
 108 {
 109         return new MathHullInset(*this);
 110 }
 111
 112
 113 MathInset::mode_type MathHullInset::currentMode() const
 114 {
 115         if (type_ == "none")
 116                 return UNDECIDED_MODE;
 117         // definitely math mode ...
 118         return MATH_MODE;
 119 }
 120
 121
 122 bool MathHullInset::idxFirst(idx_type & idx, pos_type & pos) const
 123 {
 124         idx = 0;
 125         pos = 0;
 126         return true;
 127 }
 128
 129
 130 bool MathHullInset::idxLast(idx_type & idx, pos_type & pos) const
 131 {
 132         idx = nargs() - 1;
 133         pos = cell(idx).size();
 134         return true;
 135 }
 136
 137
 138 char MathHullInset::defaultColAlign(col_type col)
 139 {
 140         if (type_ == "eqnarray")
 141                 return "rcl"[col];
 142         if (typecode(type_) >= typecode("align"))
 143                 return "rl"[col & 1];
 144         return 'c';
 145 }
 146
 147
 148 int MathHullInset::defaultColSpace(col_type col)
 149 {
 150         if (type_ == "align" || type_ == "alignat")
 151                 return 0;
 152         if (type_ == "xalignat")
 153                 return (col & 1) ? 20 : 0;
 154         if (type_ == "xxalignat")
 155                 return (col & 1) ? 40 : 0;
 156         return 0;
 157 }
 158
 159
 160 char const * MathHullInset::standardFont() const
 161 {
 162         if (type_ == "none")
 163                 return "lyxnochange";
 164         return "mathnormal";
 165 }
 166
 167
 168 void MathHullInset::metrics(MathMetricsInfo & mi) const
 169 {
 170         MathFontSetChanger dummy1(mi.base, standardFont());
 171         MathStyleChanger dummy2(mi.base, display() ? LM_ST_DISPLAY : LM_ST_TEXT);
 172
 173         // let the cells adjust themselves
 174         MathGridInset::metrics(mi);
 175
 176         if (display()) {
 177                 dim_.a += 12;
 178                 dim_.d += 12;
 179         }
 180
 181         if (numberedType()) {
 182                 MathFontSetChanger dummy(mi.base, "mathbf");
 183                 int l = 0;
 184                 for (row_type row = 0; row < nrows(); ++row)
 185                         l = max(l, mathed_string_width(mi.base.font, nicelabel(row)));
 186
 187                 if (l)
 188                         dim_.w += 30 + l;
 189         }
 190
 191         // make it at least as high as the current font
 192         int asc = 0;
 193         int des = 0;
 194         math_font_max_dim(mi.base.font, asc, des);
 195         dim_.a = max(dim_.a,  asc);
 196         dim_.d = max(dim_.d, des);
 197
 198         // for markers
 199         metricsMarkers2();
 200 }
 201
 202
 203 void MathHullInset::draw(MathPainterInfo & pi, int x, int y) const
 204 {
 205         MathFontSetChanger dummy1(pi.base, standardFont());
 206         MathStyleChanger dummy2(pi.base, display() ? LM_ST_DISPLAY : LM_ST_TEXT);
 207         MathGridInset::draw(pi, x + 1, y);
 208
 209         if (numberedType()) {
 210                 int const xx = x + colinfo_.back().offset_ + colinfo_.back().width_ + 20;
 211                 for (row_type row = 0; row < nrows(); ++row) {
 212                         int const yy = y + rowinfo_[row].offset_;
 213                         MathFontSetChanger dummy(pi.base, "mathrm");
 214                         drawStr(pi, pi.base.font, xx, yy, nicelabel(row));
 215                 }
 216         }
 217
 218         drawMarkers2(pi, x, y);
 219 }
 220
 221
 222 void MathHullInset::metricsT(TextMetricsInfo const & mi) const
 223 {
 224         if (display()) {
 225                 MathGridInset::metricsT(mi);
 226         } else {
 227                 ostringstream os;
 228                 WriteStream wi(os, false, true);
 229                 write(wi);
 230                 dim_.w = os.str().size();
 231                 dim_.a = 1;
 232                 dim_.d = 0;
 233         }
 234 }
 235
 236
 237 void MathHullInset::drawT(TextPainter & pain, int x, int y) const
 238 {
 239         if (display()) {
 240                 MathGridInset::drawT(pain, x, y);
 241         } else {
 242                 ostringstream os;
 243                 WriteStream wi(os, false, true);
 244                 write(wi);
 245                 pain.draw(x, y, os.str().c_str());
 246         }
 247 }
 248
 249
 250 string MathHullInset::label(row_type row) const
 251 {
 252         row_type n = nrows();
 253         lyx::Assert(row < n);
 254         return label_[row];
 255 }
 256
 257
 258 void MathHullInset::label(row_type row, string const & label)
 259 {
 260         //lyxerr << "setting label '" << label << "' for row " << row << endl;
 261         label_[row] = label;
 262 }
 263
 264
 265 void MathHullInset::numbered(row_type row, bool num)
 266 {
 267         nonum_[row] = !num;
 268 }
 269
 270
 271 bool MathHullInset::numbered(row_type row) const
 272 {
 273         return !nonum_[row];
 274 }
 275
 276
 277 bool MathHullInset::ams() const
 278 {
 279         return
 280                 type_ == "align" ||
 281                 type_ == "multline" ||
 282                 type_ == "gather" ||
 283                 type_ == "alignat" ||
 284                 type_ == "xalignat" ||
 285                 type_ == "xxalignat";
 286 }
 287
 288
 289 bool MathHullInset::display() const
 290 {
 291         return type_ != "simple" && type_ != "none";
 292 }
 293
 294
 295 void MathHullInset::getLabelList(std::vector<string> & labels) const
 296 {
 297         for (row_type row = 0; row < nrows(); ++row)
 298                 if (!label_[row].empty() && nonum_[row] != 1)
 299                         labels.push_back(label_[row]);
 300 }
 301
 302
 303 bool MathHullInset::numberedType() const
 304 {
 305         if (type_ == "none")
 306                 return false;
 307         if (type_ == "simple")
 308                 return false;
 309         if (type_ == "xxalignat")
 310                 return false;
 311         for (row_type row = 0; row < nrows(); ++row)
 312                 if (!nonum_[row])
 313                         return true;
 314         return false;
 315 }
 316
 317
 318 void MathHullInset::validate(LaTeXFeatures & features) const
 319 {
 320         if (ams())
 321                 features.require("amsmath");
 322
 323
 324         // Validation is necessary only if not using AMS math.
 325         // To be safe, we will always run mathedvalidate.
 326         //if (features.amsstyle)
 327         //  return;
 328
 329         features.require("boldsymbol");
 330         //features.binom      = true;
 331
 332         MathNestInset::validate(features);
 333 }
 334
 335
 336 void MathHullInset::header_write(WriteStream & os) const
 337 {
 338         bool n = numberedType();
 339
 340         if (type_ == "none")
 341                 ;
 342
 343         else if (type_ == "simple") {
 344                 os << '$';
 345                 if (cell(0).empty())
 346                         os << ' ';
 347         }
 348
 349         else if (type_ == "equation") {
 350                 if (n)
 351                         os << "\\begin{equation" << star(n) << "}\n";
 352                 else
 353                         os << "\\[\n";
 354         }
 355
 356         else if (type_ == "eqnarray" || type_ == "align")
 357                         os << "\\begin{" << type_ << star(n) << "}\n";
 358
 359         else if (type_ == "alignat" || type_ == "xalignat")
 360                 os << "\\begin{" << type_ << star(n) << "}"
 361                   << "{" << static_cast<unsigned int>((ncols() + 1)/2) << "}\n";
 362
 363         else if (type_ == "xxalignat")
 364                 os << "\\begin{" << type_ << "}"
 365                   << "{" << static_cast<unsigned int>((ncols() + 1)/2) << "}\n";
 366
 367         else if (type_ == "multline" || type_ == "gather")
 368                 os << "\\begin{" << type_ << "}\n";
 369
 370         else
 371                 os << "\\begin{unknown" << star(n) << "}";
 372 }
 373
 374
 375 void MathHullInset::footer_write(WriteStream & os) const
 376 {
 377         bool n = numberedType();
 378
 379         if (type_ == "none")
 380                 os << "\n";
 381
 382         else if (type_ == "simple")
 383                 os << '$';
 384
 385         else if (type_ == "equation")
 386                 if (n)
 387                         os << "\\end{equation" << star(n) << "}\n";
 388                 else
 389                         os << "\\]\n";
 390
 391         else if (type_ == "eqnarray" || type_ == "align" || type_ == "alignat"
 392               || type_ == "xalignat")
 393                 os << "\n\\end{" << type_ << star(n) << "}\n";
 394
 395         else if (type_ == "xxalignat" || type_ == "multline" || type_ == "gather")
 396                 os << "\n\\end{" << type_ << "}\n";
 397
 398         else
 399                 os << "\\end{unknown" << star(n) << "}";
 400 }
 401
 402
 403 bool MathHullInset::colChangeOK() const
 404 {
 405         return type_ == "align" || type_ == "alignat" || type_ == "xalignat";
 406 }
 407
 408
 409 void MathHullInset::addRow(row_type row)
 410 {
 411         nonum_.insert(nonum_.begin() + row + 1, !numberedType());
 412         label_.insert(label_.begin() + row + 1, string());
 413         MathGridInset::addRow(row);
 414 }
 415
 416
 417 void MathHullInset::delRow(row_type row)
 418 {
 419         if (nrows() <= 1)
 420                 return;
 421         MathGridInset::delRow(row);
 422         nonum_.erase(nonum_.begin() + row);
 423         label_.erase(label_.begin() + row);
 424 }
 425
 426
 427 void MathHullInset::addCol(col_type col)
 428 {
 429         if (colChangeOK())
 430                 MathGridInset::addCol(col);
 431         else
 432                 lyxerr << "Can't change number of columns in '" << type_ << "'\n";
 433 }
 434
 435
 436 void MathHullInset::delCol(col_type col)
 437 {
 438         if (colChangeOK())
 439                 MathGridInset::delCol(col);
 440         else
 441                 lyxerr << "Can't change number of columns in '" << type_ << "'\n";
 442 }
 443
 444
 445 string MathHullInset::nicelabel(row_type row) const
 446 {
 447         if (nonum_[row])
 448                 return string();
 449         if (label_[row].empty())
 450                 return string("(#)");
 451         return "(" + label_[row] + ")";
 452 }
 453
 454
 455 void MathHullInset::glueall()
 456 {
 457         MathArray ar;
 458         for (idx_type i = 0; i < nargs(); ++i)
 459                 ar.append(cell(i));
 460         *this = MathHullInset("simple");
 461         cell(0) = ar;
 462         setDefaults();
 463 }
 464
 465
 466 string const & MathHullInset::getType() const
 467 {
 468         return type_;
 469 }
 470
 471
 472 void MathHullInset::setType(string const & type)
 473 {
 474         type_ = type;
 475         setDefaults();
 476 }
 477
 478
 479
 480 void MathHullInset::mutate(string const & newtype)
 481 {
 482         //lyxerr << "mutating from '" << type_ << "' to '" << newtype << "'\n";
 483
 484         // we try to move along the chain
 485         // none <-> simple <-> equation <-> eqnarray
 486
 487         if (newtype == "dump") {
 488                 dump();
 489         }
 490
 491         else if (newtype == type_) {
 492                 // done
 493         }
 494
 495         else if (type_ == "none") {
 496                 setType("simple");
 497                 numbered(0, false);
 498                 mutate(newtype);
 499         }
 500
 501         else if (type_ == "simple") {
 502                 if (newtype == "none") {
 503                         setType("none");
 504                 } else {
 505                         setType("equation");
 506                         numbered(0, false);
 507                         mutate(newtype);
 508                 }
 509         }
 510
 511         else if (type_ == "equation") {
 512                 if (smaller(newtype, type_)) {
 513                         setType("simple");
 514                         mutate(newtype);
 515                 } else if (newtype == "eqnarray") {
 516                         MathGridInset::addCol(1);
 517                         MathGridInset::addCol(1);
 518
 519                         // split it "nicely" on the firest relop
 520                         pos_type pos = firstRelOp(cell(0));
 521                         cell(1) = MathArray(cell(0).begin() + pos, cell(0).end());
 522                         cell(0).erase(pos, cell(0).size());
 523
 524                         if (cell(1).size()) {
 525                                 cell(2) = MathArray(cell(1).begin() + 1, cell(1).end());
 526                                 cell(1).erase(1, cell(1).size());
 527                         }
 528                         setType("eqnarray");
 529                         mutate(newtype);
 530                 } else if (newtype == "multline" || newtype == "gather") {
 531                         setType(newtype);
 532                         numbered(0, false);
 533                 } else {
 534                         MathGridInset::addCol(1);
 535                         // split it "nicely"
 536                         pos_type pos = firstRelOp(cell(0));
 537                         cell(1) = cell(0);
 538                         cell(0).erase(pos, cell(0).size());
 539                         cell(1).erase(0, pos);
 540                         setType("align");
 541                         mutate(newtype);
 542                 }
 543         }
 544
 545         else if (type_ == "eqnarray") {
 546                 if (smaller(newtype, type_)) {
 547                         // set correct (no)numbering
 548                         bool allnonum = true;
 549                         for (row_type row = 0; row < nrows(); ++row)
 550                                 if (!nonum_[row])
 551                                         allnonum = false;
 552
 553                         // set first non-empty label
 554                         string label;
 555                         for (row_type row = 0; row < nrows(); ++row) {
 556                                 if (!label_[row].empty()) {
 557                                         label = label_[row];
 558                                         break;
 559                                 }
 560                         }
 561
 562                         glueall();
 563                         nonum_[0] = allnonum;
 564                         label_[0] = label;
 565                         mutate(newtype);
 566                 } else { // align & Co.
 567                         for (row_type row = 0; row < nrows(); ++row) {
 568                                 idx_type c = 3 * row + 1;
 569                                 cell(c).append(cell(c + 1));
 570                         }
 571                         MathGridInset::delCol(2);
 572                         setType("align");
 573                         mutate(newtype);
 574                 }
 575         }
 576
 577         else if (type_ == "align") {
 578                 if (smaller(newtype, type_)) {
 579                         MathGridInset::addCol(1);
 580                         setType("eqnarray");
 581                         mutate(newtype);
 582                 } else {
 583                         setType(newtype);
 584                 }
 585         }
 586
 587         else if (type_ == "multline") {
 588                 if (newtype == "gather" || newtype == "align" ||
 589                            newtype == "xalign" || newtype == "xxalign")
 590                         setType(newtype);
 591                 else if (newtype == "eqnarray") {
 592                         MathGridInset::addCol(1);
 593                         MathGridInset::addCol(1);
 594                         setType("eqnarray");
 595                 } else {
 596                         lyxerr << "mutation from '" << type_
 597                                 << "' to '" << newtype << "' not implemented" << endl;
 598                 }
 599         }
 600
 601         else if (type_ == "gather") {
 602                 if (newtype == "multline") {
 603                         setType("multline");
 604                 } else {
 605                         lyxerr << "mutation from '" << type_
 606                                 << "' to '" << newtype << "' not implemented" << endl;
 607                 }
 608         }
 609
 610         else {
 611                 lyxerr << "mutation from '" << type_
 612                                          << "' to '" << newtype << "' not implemented" << endl;
 613         }
 614 }
 615
 616
 617 string MathHullInset::eolString(row_type row, bool fragile) const
 618 {
 619         string res;
 620         if (numberedType()) {
 621                 if (!label_[row].empty())
 622                         res += "\\label{" + label_[row] + "}";
 623                 if (nonum_[row])
 624                         res += "\\nonumber ";
 625         }
 626         return res + MathGridInset::eolString(row, fragile);
 627 }
 628
 629
 630 void MathHullInset::write(WriteStream & os) const
 631 {
 632         header_write(os);
 633         MathGridInset::write(os);
 634         footer_write(os);
 635 }
 636
 637
 638 void MathHullInset::normalize(NormalStream & os) const
 639 {
 640         os << "[formula " << type_ << " ";
 641         MathGridInset::normalize(os);
 642         os << "] ";
 643 }
 644
 645
 646 void MathHullInset::mathmlize(MathMLStream & os) const
 647 {
 648         MathGridInset::mathmlize(os);
 649 }
 650
 651
 652 void MathHullInset::infoize(std::ostream & os) const
 653 {
 654         os << "Type: " << type_;
 655 }
 656
 657
 658 void MathHullInset::check() const
 659 {
 660         lyx::Assert(nonum_.size() == nrows());
 661         lyx::Assert(label_.size() == nrows());
 662 }
 663
 664
 665 void MathHullInset::doExtern
 666         (FuncRequest const & func, idx_type & idx, pos_type & pos)
 667 {
 668         string lang;
 669         string extra;
 670         istringstream iss(func.argument.c_str());
 671         iss >> lang >> extra;
 672         if (extra.empty())
 673                 extra = "noextra";
 674
 675 #ifdef WITH_WARNINGS
 676 #warning temporarily disabled
 677         //if (selection()) {
 678         //      MathArray ar;
 679         //      selGet(ar);
 680         //      lyxerr << "use selection: " << ar << "\n";
 681         //      insert(pipeThroughExtern(lang, extra, ar));
 682         //      return;
 683         //}
 684 #endif
 685
 686         MathArray eq;
 687         eq.push_back(MathAtom(new MathCharInset('=')));
 688
 689         // go to first item in line
 690         idx -= idx % ncols();
 691         pos = 0;
 692
 693         if (getType() == "simple") {
 694                 size_type pos = cell(idx).find_last(eq);
 695                 MathArray ar;
 696                 if (pos == cell(idx).size()) {
 697                         ar = cell(idx);
 698                         lyxerr << "use whole cell: " << ar << "\n";
 699                 } else {
 700                         ar = MathArray(cell(idx).begin() + pos + 1, cell(idx).end());
 701                         lyxerr << "use partial cell form pos: " << pos << "\n";
 702                 }
 703                 cell(idx).append(eq);
 704                 cell(idx).append(pipeThroughExtern(lang, extra, ar));
 705                 pos = cell(idx).size();
 706                 return;
 707         }
 708
 709         if (getType() == "equation") {
 710                 lyxerr << "use equation inset\n";
 711                 mutate("eqnarray");
 712                 MathArray & ar = cell(idx);
 713                 lyxerr << "use cell: " << ar << "\n";
 714                 cell(idx + 1) = eq;
 715                 cell(idx + 2) = pipeThroughExtern(lang, extra, ar);
 716                 // move to end of line
 717                 idx += 2;
 718                 pos = cell(idx).size();
 719                 return;
 720         }
 721
 722         {
 723                 lyxerr << "use eqnarray\n";
 724                 idx -= idx % ncols();
 725                 idx += 2;
 726                 pos = 0;
 727                 MathArray ar = cell(idx);
 728                 lyxerr << "use cell: " << ar << "\n";
 729 #ifdef WITH_WARNINGS
 730 #warning temporarily disabled
 731 #endif
 732                 addRow(row(idx));
 733                 cell(idx + 2) = eq;
 734                 cell(idx + 3) = pipeThroughExtern(lang, extra, ar);
 735                 idx += 3;
 736                 pos = cell(idx).size();
 737         }
 738 }
 739
 740
 741 MathInset::result_type MathHullInset::dispatch
 742         (FuncRequest const & cmd, idx_type & idx, pos_type & pos)
 743 {
 744         switch (cmd.action) {
 745
 746                 case LFUN_BREAKLINE:
 747                         if (type_ == "simple" || type_ == "equation") {
 748                                 mutate("eqnarray");
 749                                 idx = 1;
 750                                 pos = 0;
 751                                 return DISPATCHED_POP;
 752                         }
 753                         return MathGridInset::dispatch(cmd, idx, pos);
 754
 755                 case LFUN_MATH_NUMBER:
 756                         //lyxerr << "toggling all numbers\n";
 757                         if (display()) {
 758                                 //bv->lockedInsetStoreUndo(Undo::INSERT);
 759                                 bool old = numberedType();
 760                                 for (row_type row = 0; row < nrows(); ++row)
 761                                         numbered(row, !old);
 762                                 //bv->owner()->message(old ? _("No number") : _("Number"));
 763                                 //updateLocal(bv, true);
 764                         }
 765                         return DISPATCHED;
 766
 767                 case LFUN_MATH_NONUMBER:
 768                         if (display()) {
 769                                 //bv->lockedInsetStoreUndo(Undo::INSERT);
 770                                 bool old = numbered(row(idx));
 771                                 //bv->owner()->message(old ? _("No number") : _("Number"));
 772                                 numbered(row(idx), !old);
 773                                 //updateLocal(bv, true);
 774                         }
 775                         return DISPATCHED;
 776
 777                 case LFUN_INSERT_LABEL: {
 778                         row_type r = row(idx);
 779                         string old_label = label(r);
 780                         string new_label = cmd.argument;
 781
 782                         if (new_label.empty()) {
 783                                 string const default_label =
 784                                         (lyxrc.label_init_length >= 0) ? "eq:" : "";
 785                                 pair<bool, string> const res = old_label.empty()
 786                                         ? Alert::askForText(_("Enter new label to insert:"), default_label)
 787                                         : Alert::askForText(_("Enter label:"), old_label);
 788                                 if (!res.first)
 789                                         break;
 790                                 new_label = trim(res.second);
 791                         }
 792
 793                         //if (new_label == old_label)
 794                         //      break;  // Nothing to do
 795
 796                         if (!new_label.empty())
 797                                 numbered(r, true);
 798
 799 #warning FIXME: please check you really mean repaint() ... is it needed,
 800 #warning and if so, should it be update() instead ?
 801                         if (!new_label.empty()
 802                                         && cmd.view()->ChangeRefsIfUnique(old_label, new_label))
 803                                 cmd.view()->repaint();
 804
 805                         label(r, new_label);
 806                         return DISPATCHED;
 807                 }
 808
 809                 case LFUN_MATH_EXTERN:
 810                         doExtern(cmd, idx, pos);
 811                         return DISPATCHED_POP;
 812
 813                 case LFUN_MATH_MUTATE: {
 814                         row_type r = row(idx);
 815                         col_type c = col(idx);
 816                         mutate(cmd.argument);
 817                         idx = r * ncols() + c;
 818                         if (idx >= nargs())
 819                                 idx = nargs() - 1;
 820                         if (pos > cell(idx).size())
 821                                 pos = cell(idx).size();
 822                         return DISPATCHED_POP;
 823                 }
 824
 825                 case LFUN_MATH_DISPLAY: {
 826                         mutate(type_ == "simple" ? "equation" : "simple");
 827                         idx = 0;
 828                         pos = cell(idx).size();
 829                         return DISPATCHED_POP;
 830                 }
 831
 832                 default:
 833                         return MathGridInset::dispatch(cmd, idx, pos);
 834
 835         }
 836         return UNDISPATCHED;
 837 }