src/mathed/MathParser.cpp

   1 /**
   2  * \file MathParser.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author André Pönitz
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 /*
  12
  13 If someone desperately needs partial "structures" (such as a few
  14 cells of an array inset or similar) (s)he could uses the
  15 following hack as starting point to write some macros:
  16
  17   \newif\ifcomment
  18   \commentfalse
  19   \ifcomment
  20           \def\makeamptab{\catcode`\&=4\relax}
  21           \def\makeampletter{\catcode`\&=11\relax}
  22     \def\b{\makeampletter\expandafter\makeamptab\bi}
  23     \long\def\bi#1\e{}
  24   \else
  25     \def\b{}\def\e{}
  26   \fi
  27   ...
  28
  29   \[\begin{array}{ccc}
  30 1
  31 &
  32
  33   \end{array}\]
  34
  35 */
  36
  37
  38 #include <config.h>
  39
  40 #include "MathParser.h"
  41
  42 #include "InsetMathArray.h"
  43 #include "InsetMathBig.h"
  44 #include "InsetMathBrace.h"
  45 #include "InsetMathCancelto.h"
  46 #include "InsetMathChar.h"
  47 #include "InsetMathColor.h"
  48 #include "InsetMathComment.h"
  49 #include "InsetMathDelim.h"
  50 #include "InsetMathEnsureMath.h"
  51 #include "InsetMathEnv.h"
  52 #include "InsetMathFrac.h"
  53 #include "InsetMathKern.h"
  54 #include "MathMacro.h"
  55 #include "InsetMathPar.h"
  56 #include "InsetMathRef.h"
  57 #include "InsetMathRoot.h"
  58 #include "InsetMathScript.h"
  59 #include "InsetMathSideset.h"
  60 #include "InsetMathSpace.h"
  61 #include "InsetMathSplit.h"
  62 #include "InsetMathSqrt.h"
  63 #include "InsetMathStackrel.h"
  64 #include "InsetMathString.h"
  65 #include "InsetMathTabular.h"
  66 #include "MathMacroTemplate.h"
  67 #include "MathFactory.h"
  68 #include "MathMacroArgument.h"
  69 #include "MathSupport.h"
  70
  71 #include "Buffer.h"
  72 #include "BufferParams.h"
  73 #include "Encoding.h"
  74 #include "Lexer.h"
  75
  76 #include "support/debug.h"
  77 #include "support/convert.h"
  78 #include "support/docstream.h"
  79
  80 #include <sstream>
  81
  82 //#define FILEDEBUG
  83
  84 using namespace std;
  85
  86 namespace lyx {
  87
  88 namespace {
  89
  90 InsetMath::mode_type asMode(InsetMath::mode_type oldmode, docstring const & str)
  91 {
  92         //lyxerr << "handling mode: '" << str << "'" << endl;
  93         if (str == "mathmode")
  94                 return InsetMath::MATH_MODE;
  95         if (str == "textmode" || str == "forcetext")
  96                 return InsetMath::TEXT_MODE;
  97         return oldmode;
  98 }
  99
 100
 101 bool stared(docstring const & s)
 102 {
 103         size_t const n = s.size();
 104         return n && s[n - 1] == '*';
 105 }
 106
 107
 108 docstring const repl(docstring const & oldstr, char_type const c,
 109                      docstring const & macro, bool textmode = false)
 110 {
 111         docstring newstr;
 112         size_t i;
 113         size_t j;
 114
 115         for (i = 0, j = 0; i < oldstr.size(); ++i) {
 116                 if (c == oldstr[i]) {
 117                         newstr.append(oldstr, j, i - j);
 118                         newstr.append(macro);
 119                         j = i + 1;
 120                         if (macro.size() > 2 && j < oldstr.size())
 121                                 newstr += (textmode && oldstr[j] == ' ' ? '\\' : ' ');
 122                 }
 123         }
 124
 125         // Any substitution?
 126         if (j == 0)
 127                 return oldstr;
 128
 129         newstr.append(oldstr, j, i - j);
 130         return newstr;
 131 }
 132
 133
 134 docstring escapeSpecialChars(docstring const & str, bool textmode)
 135 {
 136         docstring const backslash = textmode ? from_ascii("\\textbackslash")
 137                                              : from_ascii("\\backslash");
 138         docstring const caret = textmode ? from_ascii("\\textasciicircum")
 139                                          : from_ascii("\\mathcircumflex");
 140         docstring const tilde = textmode ? from_ascii("\\textasciitilde")
 141                                          : from_ascii("\\sim");
 142
 143         return repl(repl(repl(repl(repl(repl(repl(repl(repl(repl(str,
 144                         '\\', backslash, textmode),
 145                         '^', caret, textmode),
 146                         '~', tilde, textmode),
 147                         '_', from_ascii("\\_")),
 148                         '$', from_ascii("\\$")),
 149                         '#', from_ascii("\\#")),
 150                         '&', from_ascii("\\&")),
 151                         '%', from_ascii("\\%")),
 152                         '{', from_ascii("\\{")),
 153                         '}', from_ascii("\\}"));
 154 }
 155
 156
 157 /*!
 158  * Add the row \p cellrow to \p grid.
 159  * \returns wether the row could be added. Adding a row can fail for
 160  * environments like "equation" that have a fixed number of rows.
 161  */
 162 bool addRow(InsetMathGrid & grid, InsetMathGrid::row_type & cellrow,
 163             docstring const & vskip, bool allow_newpage_ = true)
 164 {
 165         ++cellrow;
 166         if (cellrow == grid.nrows()) {
 167                 //lyxerr << "adding row " << cellrow << endl;
 168                 grid.addRow(cellrow - 1);
 169                 if (cellrow == grid.nrows()) {
 170                         // We can't add a row to this grid, so let's
 171                         // append the content of this cell to the previous
 172                         // one.
 173                         // This does not happen in well formed .lyx files,
 174                         // but LyX versions 1.3.x and older could create
 175                         // such files and tex2lyx can still do that.
 176                         --cellrow;
 177                         lyxerr << "ignoring extra row";
 178                         if (!vskip.empty())
 179                                 lyxerr << " with extra space " << to_utf8(vskip);
 180                         if (!allow_newpage_)
 181                                 lyxerr << " with no page break allowed";
 182                         lyxerr << '.' << endl;
 183                         return false;
 184                 }
 185         }
 186         grid.vcrskip(Length(to_utf8(vskip)), cellrow - 1);
 187         grid.rowinfo(cellrow - 1).allow_newpage_ = allow_newpage_;
 188         return true;
 189 }
 190
 191
 192 /*!
 193  * Add the column \p cellcol to \p grid.
 194  * \returns wether the column could be added. Adding a column can fail for
 195  * environments like "eqnarray" that have a fixed number of columns.
 196  */
 197 bool addCol(InsetMathGrid & grid, InsetMathGrid::col_type & cellcol)
 198 {
 199         ++cellcol;
 200         if (cellcol == grid.ncols()) {
 201                 //lyxerr << "adding column " << cellcol << endl;
 202                 grid.addCol(cellcol);
 203                 if (cellcol == grid.ncols()) {
 204                         // We can't add a column to this grid, so let's
 205                         // append the content of this cell to the previous
 206                         // one.
 207                         // This does not happen in well formed .lyx files,
 208                         // but LyX versions 1.3.x and older could create
 209                         // such files and tex2lyx can still do that.
 210                         --cellcol;
 211                         lyxerr << "ignoring extra column." << endl;
 212                         return false;
 213                 }
 214         }
 215         return true;
 216 }
 217
 218
 219 /*!
 220  * Check whether the last row is empty and remove it if yes.
 221  * Otherwise the following code
 222  * \verbatim
 223 \begin{array}{|c|c|}
 224 \hline
 225 1 & 2 \\ \hline
 226 3 & 4 \\ \hline
 227 \end{array}
 228  * \endverbatim
 229  * will result in a grid with 3 rows (+ the dummy row that is always present),
 230  * because the last '\\' opens a new row.
 231  * Note that this is only needed for inner-hull grid types, such as array
 232  * or aligned, but not for outer-hull grid types, such as eqnarray or align.
 233  */
 234 void delEmptyLastRow(InsetMathGrid & grid)
 235 {
 236         InsetMathGrid::row_type const row = grid.nrows() - 1;
 237         for (InsetMathGrid::col_type col = 0; col < grid.ncols(); ++col) {
 238                 if (!grid.cell(grid.index(row, col)).empty())
 239                         return;
 240         }
 241         // Copy the row information of the empty row (which would contain the
 242         // last hline in the example above) to the dummy row and delete the
 243         // empty row.
 244         grid.rowinfo(row + 1) = grid.rowinfo(row);
 245         grid.delRow(row);
 246 }
 247
 248
 249 /*!
 250  * Tell whether the environment name corresponds to an inner-hull grid type.
 251  */
 252 bool innerHull(docstring const & name)
 253 {
 254         // For [bB]matrix, [vV]matrix, and pmatrix we can check the suffix only
 255         return name == "array" || name == "cases" || name == "aligned"
 256                 || name == "alignedat" || name == "gathered" || name == "split"
 257                 || name == "subarray" || name == "tabular" || name == "matrix"
 258                 || name == "smallmatrix" || name.substr(1) == "matrix";
 259 }
 260
 261
 262 // These are TeX's catcodes
 263 enum CatCode {
 264         catEscape,     // 0    backslash
 265         catBegin,      // 1    {
 266         catEnd,        // 2    }
 267         catMath,       // 3    $
 268         catAlign,      // 4    &
 269         catNewline,    // 5    ^^M
 270         catParameter,  // 6    #
 271         catSuper,      // 7    ^
 272         catSub,        // 8    _
 273         catIgnore,     // 9
 274         catSpace,      // 10   space
 275         catLetter,     // 11   a-zA-Z
 276         catOther,      // 12   none of the above
 277         catActive,     // 13   ~
 278         catComment,    // 14   %
 279         catInvalid     // 15   <delete>
 280 };
 281
 282 CatCode theCatcode[128];
 283
 284
 285 inline CatCode catcode(char_type c)
 286 {
 287         /* The only characters that are not catOther lie in the pure ASCII
 288          * range. Therefore theCatcode has only 128 entries.
 289          * TeX itself deals with 8bit characters, so if needed this table
 290          * could be enlarged to 256 entries.
 291          * Any larger value does not make sense, since the fact that we use
 292          * unicode internally does not change Knuth's TeX engine.
 293          * Apart from that a table for the full 21bit UCS4 range would waste
 294          * too much memory. */
 295         if (c >= 128)
 296                 return catOther;
 297
 298         return theCatcode[c];
 299 }
 300
 301
 302 enum {
 303         FLAG_ALIGN      = 1 << 0,  //  next & or \\ ends the parsing process
 304         FLAG_BRACE_LAST = 1 << 1,  //  next closing brace ends the parsing
 305         FLAG_RIGHT      = 1 << 2,  //  next \\right ends the parsing process
 306         FLAG_END        = 1 << 3,  //  next \\end ends the parsing process
 307         FLAG_BRACK_LAST = 1 << 4,  //  next closing bracket ends the parsing
 308         FLAG_TEXTMODE   = 1 << 5,  //  we are in a box
 309         FLAG_ITEM       = 1 << 6,  //  read a (possibly braced) token
 310         FLAG_LEAVE      = 1 << 7,  //  leave the loop at the end
 311         FLAG_SIMPLE     = 1 << 8,  //  next $ leaves the loop
 312         FLAG_EQUATION   = 1 << 9,  //  next \] leaves the loop
 313         FLAG_SIMPLE2    = 1 << 10, //  next \) leaves the loop
 314         FLAG_OPTION     = 1 << 11, //  read [...] style option
 315         FLAG_BRACED     = 1 << 12  //  read {...} style argument
 316 };
 317
 318
 319 //
 320 // Helper class for parsing
 321 //
 322
 323 class Token {
 324 public:
 325         ///
 326         Token() : cs_(), char_(0), cat_(catIgnore) {}
 327         ///
 328         Token(char_type c, CatCode cat) : cs_(), char_(c), cat_(cat) {}
 329         ///
 330         explicit Token(docstring const & cs) : cs_(cs), char_(0), cat_(catIgnore) {}
 331
 332         ///
 333         docstring const & cs() const { return cs_; }
 334         ///
 335         CatCode cat() const { return cat_; }
 336         ///
 337         char_type character() const { return char_; }
 338         ///
 339         docstring asString() const { return !cs_.empty() ? cs_ : docstring(1, char_); }
 340         ///
 341         docstring asInput() const { return !cs_.empty() ? '\\' + cs_ : docstring(1, char_); }
 342
 343 private:
 344         ///
 345         docstring cs_;
 346         ///
 347         char_type char_;
 348         ///
 349         CatCode cat_;
 350 };
 351
 352
 353 ostream & operator<<(ostream & os, Token const & t)
 354 {
 355         if (!t.cs().empty()) {
 356                 docstring const & cs = t.cs();
 357                 // FIXME: For some strange reason, the stream operator instanciate
 358                 // a new Token before outputting the contents of t.cs().
 359                 // Because of this the line
 360                 //     os << '\\' << cs;
 361                 // below becomes recursive.
 362                 // In order to avoid that we return early:
 363                 if (cs == "\\")
 364                         return os;
 365                 os << '\\' << to_utf8(cs);
 366         }
 367         else if (t.cat() == catLetter)
 368                 os << t.character();
 369         else
 370                 os << '[' << t.character() << ',' << t.cat() << ']';
 371         return os;
 372 }
 373
 374
 375 class Parser {
 376 public:
 377         ///
 378         typedef  InsetMath::mode_type mode_type;
 379         ///
 380         typedef  Parse::flags parse_mode;
 381
 382         ///
 383         Parser(Lexer & lex, parse_mode mode, Buffer * buf);
 384         /// Only use this for reading from .lyx file format, for the reason
 385         /// see Parser::tokenize(istream &).
 386         Parser(istream & is, parse_mode mode, Buffer * buf);
 387         ///
 388         Parser(docstring const & str, parse_mode mode, Buffer * buf);
 389
 390         ///
 391         bool parse(MathAtom & at);
 392         ///
 393         bool parse(MathData & array, unsigned flags, mode_type mode);
 394         ///
 395         bool parse1(InsetMathGrid & grid, unsigned flags, mode_type mode,
 396                 bool numbered);
 397         ///
 398         MathData parse(unsigned flags, mode_type mode);
 399         ///
 400         int lineno() const { return lineno_; }
 401         ///
 402         void putback();
 403
 404 private:
 405         ///
 406         void parse2(MathAtom & at, unsigned flags, mode_type mode, bool numbered);
 407         /// get arg delimited by 'left' and 'right'
 408         docstring getArg(char_type left, char_type right);
 409         ///
 410         char_type getChar();
 411         ///
 412         void error(string const & msg);
 413         void error(docstring const & msg) { error(to_utf8(msg)); }
 414         /// dump contents to screen
 415         void dump() const;
 416         /// Only use this for reading from .lyx file format (see
 417         /// implementation for reason)
 418         void tokenize(istream & is);
 419         ///
 420         void tokenize(docstring const & s);
 421         ///
 422         void skipSpaceTokens(idocstream & is, char_type c);
 423         ///
 424         void push_back(Token const & t);
 425         ///
 426         void pop_back();
 427         ///
 428         Token const & prevToken() const;
 429         ///
 430         Token const & nextToken() const;
 431         ///
 432         Token const & getToken();
 433         /// skips spaces if any
 434         void skipSpaces();
 435         ///
 436         void lex(docstring const & s);
 437         ///
 438         bool good() const;
 439         ///
 440         docstring parse_verbatim_item();
 441         ///
 442         docstring parse_verbatim_option();
 443
 444         ///
 445         int lineno_;
 446         ///
 447         vector<Token> tokens_;
 448         ///
 449         unsigned pos_;
 450         /// Stack of active environments
 451         vector<docstring> environments_;
 452         ///
 453         parse_mode mode_;
 454         ///
 455         bool success_;
 456         ///
 457         Buffer * buffer_;
 458 };
 459
 460
 461 Parser::Parser(Lexer & lexer, parse_mode mode, Buffer * buf)
 462         : lineno_(lexer.lineNumber()), pos_(0), mode_(mode), success_(true),
 463           buffer_(buf)
 464 {
 465         tokenize(lexer.getStream());
 466         lexer.eatLine();
 467 }
 468
 469
 470 Parser::Parser(istream & is, parse_mode mode, Buffer * buf)
 471         : lineno_(0), pos_(0), mode_(mode), success_(true), buffer_(buf)
 472 {
 473         tokenize(is);
 474 }
 475
 476
 477 Parser::Parser(docstring const & str, parse_mode mode, Buffer * buf)
 478         : lineno_(0), pos_(0), mode_(mode), success_(true), buffer_(buf)
 479 {
 480         tokenize(str);
 481 }
 482
 483
 484 void Parser::push_back(Token const & t)
 485 {
 486         tokens_.push_back(t);
 487 }
 488
 489
 490 void Parser::pop_back()
 491 {
 492         tokens_.pop_back();
 493 }
 494
 495
 496 Token const & Parser::prevToken() const
 497 {
 498         static const Token dummy;
 499         return pos_ > 0 ? tokens_[pos_ - 1] : dummy;
 500 }
 501
 502
 503 Token const & Parser::nextToken() const
 504 {
 505         static const Token dummy;
 506         return good() ? tokens_[pos_] : dummy;
 507 }
 508
 509
 510 Token const & Parser::getToken()
 511 {
 512         static const Token dummy;
 513         //lyxerr << "looking at token " << tokens_[pos_] << " pos: " << pos_ << endl;
 514         return good() ? tokens_[pos_++] : dummy;
 515 }
 516
 517
 518 void Parser::skipSpaces()
 519 {
 520         while (nextToken().cat() == catSpace || nextToken().cat() == catNewline)
 521                 getToken();
 522 }
 523
 524
 525 void Parser::putback()
 526 {
 527         --pos_;
 528 }
 529
 530
 531 bool Parser::good() const
 532 {
 533         return pos_ < tokens_.size();
 534 }
 535
 536
 537 char_type Parser::getChar()
 538 {
 539         if (!good()) {
 540                 error("The input stream is not well...");
 541                 return 0;
 542         }
 543         return tokens_[pos_++].character();
 544 }
 545
 546
 547 docstring Parser::getArg(char_type left, char_type right)
 548 {
 549         docstring result;
 550         skipSpaces();
 551
 552         if (!good())
 553                 return result;
 554
 555         char_type c = getChar();
 556
 557         if (c != left)
 558                 putback();
 559         else
 560                 while ((c = getChar()) != right && good())
 561                         result += c;
 562
 563         return result;
 564 }
 565
 566
 567 void Parser::skipSpaceTokens(idocstream & is, char_type c)
 568 {
 569         // skip trailing spaces
 570         while (catcode(c) == catSpace || catcode(c) == catNewline)
 571                 if (!is.get(c))
 572                         break;
 573         //lyxerr << "putting back: " << c << endl;
 574         is.putback(c);
 575 }
 576
 577
 578 void Parser::tokenize(istream & is)
 579 {
 580         // eat everything up to the next \end_inset or end of stream
 581         // and store it in s for further tokenization
 582         string s;
 583         char c;
 584         while (is.get(c)) {
 585                 s += c;
 586                 if (s.size() >= 10 && s.substr(s.size() - 10) == "\\end_inset") {
 587                         s = s.substr(0, s.size() - 10);
 588                         break;
 589                 }
 590         }
 591         // Remove the space after \end_inset
 592         if (is.get(c) && c != ' ')
 593                 is.unget();
 594
 595         // tokenize buffer
 596         tokenize(from_utf8(s));
 597 }
 598
 599
 600 void Parser::tokenize(docstring const & buffer)
 601 {
 602         idocstringstream is(mode_ & Parse::VERBATIM
 603                         ? escapeSpecialChars(buffer, mode_ & Parse::TEXTMODE)
 604                         : buffer, ios::in | ios::binary);
 605
 606         char_type c;
 607         while (is.get(c)) {
 608                 //lyxerr << "reading c: " << c << endl;
 609
 610                 switch (catcode(c)) {
 611                         case catNewline: {
 612                                 ++lineno_;
 613                                 is.get(c);
 614                                 if (catcode(c) == catNewline)
 615                                         ; //push_back(Token("par"));
 616                                 else {
 617                                         push_back(Token('\n', catNewline));
 618                                         is.putback(c);
 619                                 }
 620                                 break;
 621                         }
 622
 623 /*
 624                         case catComment: {
 625                                 while (is.get(c) && catcode(c) != catNewline)
 626                                         ;
 627                                 ++lineno_;
 628                                 break;
 629                         }
 630 */
 631
 632                         case catEscape: {
 633                                 is.get(c);
 634                                 if (!is) {
 635                                         error("unexpected end of input");
 636                                 } else {
 637                                         if (c == '\n')
 638                                                 c = ' ';
 639                                         docstring s(1, c);
 640                                         if (catcode(c) == catLetter) {
 641                                                 // collect letters
 642                                                 while (is.get(c) && catcode(c) == catLetter)
 643                                                         s += c;
 644                                                 skipSpaceTokens(is, c);
 645                                         }
 646                                         push_back(Token(s));
 647                                 }
 648                                 break;
 649                         }
 650
 651                         case catSuper:
 652                         case catSub: {
 653                                 push_back(Token(c, catcode(c)));
 654                                 is.get(c);
 655                                 skipSpaceTokens(is, c);
 656                                 break;
 657                         }
 658
 659                         case catIgnore: {
 660                                 if (!(mode_ & Parse::QUIET))
 661                                         lyxerr << "ignoring a char: " << int(c) << endl;
 662                                 break;
 663                         }
 664
 665                         default:
 666                                 push_back(Token(c, catcode(c)));
 667                 }
 668         }
 669
 670 #ifdef FILEDEBUG
 671         dump();
 672 #endif
 673 }
 674
 675
 676 void Parser::dump() const
 677 {
 678         lyxerr << "\nTokens: ";
 679         for (unsigned i = 0; i < tokens_.size(); ++i) {
 680                 if (i == pos_)
 681                         lyxerr << " <#> ";
 682                 lyxerr << tokens_[i];
 683         }
 684         lyxerr << " pos: " << pos_ << endl;
 685 }
 686
 687
 688 void Parser::error(string const & msg)
 689 {
 690         success_ = false;
 691         if (!(mode_ & Parse::QUIET)) {
 692                 lyxerr << "Line ~" << lineno_ << ": Math parse error: "
 693                        << msg << endl;
 694                 dump();
 695         }
 696 }
 697
 698
 699 bool Parser::parse(MathAtom & at)
 700 {
 701         skipSpaces();
 702         MathData ar(buffer_);
 703         parse(ar, false, InsetMath::UNDECIDED_MODE);
 704         if (ar.size() != 1 || ar.front()->getType() == hullNone) {
 705                 if (!(mode_ & Parse::QUIET))
 706                         lyxerr << "unusual contents found: " << ar << endl;
 707                 at = MathAtom(new InsetMathPar(buffer_, ar));
 708                 //if (at->nargs() > 0)
 709                 //      at.nucleus()->cell(0) = ar;
 710                 //else
 711                 //      lyxerr << "unusual contents found: " << ar << endl;
 712                 success_ = false;
 713         } else
 714                 at = ar[0];
 715         return success_;
 716 }
 717
 718
 719 docstring Parser::parse_verbatim_option()
 720 {
 721         skipSpaces();
 722         docstring res;
 723         if (nextToken().character() == '[') {
 724                 Token t = getToken();
 725                 for (Token t = getToken(); t.character() != ']' && good(); t = getToken()) {
 726                         if (t.cat() == catBegin) {
 727                                 putback();
 728                                 res += '{' + parse_verbatim_item() + '}';
 729                         } else
 730                                 res += t.asInput();
 731                 }
 732         }
 733         return res;
 734 }
 735
 736
 737 docstring Parser::parse_verbatim_item()
 738 {
 739         skipSpaces();
 740         docstring res;
 741         if (nextToken().cat() == catBegin) {
 742                 Token t = getToken();
 743                 for (Token t = getToken(); t.cat() != catEnd && good(); t = getToken()) {
 744                         if (t.cat() == catBegin) {
 745                                 putback();
 746                                 res += '{' + parse_verbatim_item() + '}';
 747                         }
 748                         else
 749                                 res += t.asInput();
 750                 }
 751         }
 752         return res;
 753 }
 754
 755
 756 MathData Parser::parse(unsigned flags, mode_type mode)
 757 {
 758         MathData ar(buffer_);
 759         parse(ar, flags, mode);
 760         return ar;
 761 }
 762
 763
 764 bool Parser::parse(MathData & array, unsigned flags, mode_type mode)
 765 {
 766         InsetMathGrid grid(buffer_, 1, 1);
 767         parse1(grid, flags, mode, false);
 768         array = grid.cell(0);
 769         return success_;
 770 }
 771
 772
 773 void Parser::parse2(MathAtom & at, const unsigned flags, const mode_type mode,
 774         const bool numbered)
 775 {
 776         parse1(*(at.nucleus()->asGridInset()), flags, mode, numbered);
 777 }
 778
 779
 780 bool Parser::parse1(InsetMathGrid & grid, unsigned flags,
 781         const mode_type mode, const bool numbered)
 782 {
 783         int limits = 0;
 784         InsetMathGrid::row_type cellrow = 0;
 785         InsetMathGrid::col_type cellcol = 0;
 786         MathData * cell = &grid.cell(grid.index(cellrow, cellcol));
 787         Buffer * buf = buffer_;
 788
 789         if (grid.asHullInset())
 790                 grid.asHullInset()->numbered(cellrow, numbered);
 791
 792         //dump();
 793         //lyxerr << " flags: " << flags << endl;
 794         //lyxerr << " mode: " << mode  << endl;
 795         //lyxerr << "grid: " << grid << endl;
 796
 797         while (good()) {
 798                 Token const & t = getToken();
 799
 800 #ifdef FILEDEBUG
 801                 lyxerr << "t: " << t << " flags: " << flags << endl;
 802                 lyxerr << "mode: " << mode  << endl;
 803                 cell->dump();
 804                 lyxerr << endl;
 805 #endif
 806
 807                 if (flags & FLAG_ITEM) {
 808
 809                         if (t.cat() == catBegin) {
 810                                 // skip the brace and collect everything to the next matching
 811                                 // closing brace
 812                                 parse1(grid, FLAG_BRACE_LAST, mode, numbered);
 813                                 return success_;
 814                         }
 815
 816                         // handle only this single token, leave the loop if done
 817                         flags = FLAG_LEAVE;
 818                 }
 819
 820
 821                 if (flags & FLAG_BRACED) {
 822                         if (t.cat() == catSpace)
 823                                 continue;
 824
 825                         if (t.cat() != catBegin) {
 826                                 error("opening brace expected");
 827                                 return success_;
 828                         }
 829
 830                         // skip the brace and collect everything to the next matching
 831                         // closing brace
 832                         flags = FLAG_BRACE_LAST;
 833                 }
 834
 835
 836                 if (flags & FLAG_OPTION) {
 837                         if (t.cat() == catOther && t.character() == '[') {
 838                                 MathData ar;
 839                                 parse(ar, FLAG_BRACK_LAST, mode);
 840                                 cell->append(ar);
 841                         } else {
 842                                 // no option found, put back token and we are done
 843                                 putback();
 844                         }
 845                         return success_;
 846                 }
 847
 848                 //
 849                 // cat codes
 850                 //
 851                 if (t.cat() == catMath) {
 852                         if (mode != InsetMath::MATH_MODE) {
 853                                 // we are inside some text mode thingy, so opening new math is allowed
 854                                 Token const & n = getToken();
 855                                 if (n.cat() == catMath) {
 856                                         // TeX's $$...$$ syntax for displayed math
 857                                         if (mode == InsetMath::UNDECIDED_MODE) {
 858                                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullEquation)));
 859                                                 parse2(cell->back(), FLAG_SIMPLE, InsetMath::MATH_MODE, false);
 860                                                 getToken(); // skip the second '$' token
 861                                         } else {
 862                                                 // This is not an outer hull and display math is
 863                                                 // not allowed inside text mode environments.
 864                                                 error("bad math environment $$");
 865                                                 break;
 866                                         }
 867                                 } else {
 868                                         // simple $...$  stuff
 869                                         putback();
 870                                         if (mode == InsetMath::UNDECIDED_MODE) {
 871                                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullSimple)));
 872                                                 parse2(cell->back(), FLAG_SIMPLE, InsetMath::MATH_MODE, false);
 873                                         } else {
 874                                                 // Don't create nested math hulls (bug #5392)
 875                                                 cell->push_back(MathAtom(new InsetMathEnsureMath(buf)));
 876                                                 parse(cell->back().nucleus()->cell(0), FLAG_SIMPLE, InsetMath::MATH_MODE);
 877                                         }
 878                                 }
 879                         }
 880
 881                         else if (flags & FLAG_SIMPLE) {
 882                                 // this is the end of the formula
 883                                 return success_;
 884                         }
 885
 886                         else {
 887                                 Token const & n = getToken();
 888                                 if (n.cat() == catMath) {
 889                                         error("something strange in the parser");
 890                                         break;
 891                                 } else {
 892                                         // This is inline math ($...$), but the parser thinks we are
 893                                         // already in math mode and latex would issue an error, unless we
 894                                         // are inside a text mode user macro. We have no way to tell, so
 895                                         // let's play safe by using \ensuremath, as it will work in any case.
 896                                         putback();
 897                                         cell->push_back(MathAtom(new InsetMathEnsureMath(buf)));
 898                                         parse(cell->back().nucleus()->cell(0), FLAG_SIMPLE, InsetMath::MATH_MODE);
 899                                 }
 900                         }
 901                 }
 902
 903                 else if (t.cat() == catLetter)
 904                         cell->push_back(MathAtom(new InsetMathChar(t.character())));
 905
 906                 else if (t.cat() == catSpace && mode != InsetMath::MATH_MODE) {
 907                         if (cell->empty() || cell->back()->getChar() != ' ')
 908                                 cell->push_back(MathAtom(new InsetMathChar(t.character())));
 909                 }
 910
 911                 else if (t.cat() == catNewline && mode != InsetMath::MATH_MODE) {
 912                         if (cell->empty() || cell->back()->getChar() != ' ')
 913                                 cell->push_back(MathAtom(new InsetMathChar(' ')));
 914                 }
 915
 916                 else if (t.cat() == catParameter) {
 917                         Token const & n = getToken();
 918                         cell->push_back(MathAtom(new MathMacroArgument(n.character()-'0')));
 919                 }
 920
 921                 else if (t.cat() == catActive)
 922                         cell->push_back(MathAtom(new InsetMathSpace(string(1, t.character()), "")));
 923
 924                 else if (t.cat() == catBegin) {
 925                         MathData ar;
 926                         parse(ar, FLAG_BRACE_LAST, mode);
 927                         // do not create a BraceInset if they were written by LyX
 928                         // this helps to keep the annoyance of  "a choose b"  to a minimum
 929                         if (ar.size() == 1 && ar[0]->extraBraces())
 930                                 cell->append(ar);
 931                         else
 932                                 cell->push_back(MathAtom(new InsetMathBrace(ar)));
 933                 }
 934
 935                 else if (t.cat() == catEnd) {
 936                         if (flags & FLAG_BRACE_LAST)
 937                                 return success_;
 938                         error("found '}' unexpectedly");
 939                         //LASSERT(false, /**/);
 940                         //add(cell, '}', LM_TC_TEX);
 941                 }
 942
 943                 else if (t.cat() == catAlign) {
 944                         //lyxerr << " column now " << (cellcol + 1)
 945                         //       << " max: " << grid.ncols() << endl;
 946                         if (flags & FLAG_ALIGN)
 947                                 return success_;
 948                         if (addCol(grid, cellcol))
 949                                 cell = &grid.cell(grid.index(cellrow, cellcol));
 950                 }
 951
 952                 else if (t.cat() == catSuper || t.cat() == catSub) {
 953                         bool up = (t.cat() == catSuper);
 954                         // we need no new script inset if the last thing was a scriptinset,
 955                         // which has that script already not the same script already
 956                         if (cell->empty())
 957                                 cell->push_back(MathAtom(new InsetMathScript(buf, up)));
 958                         else if (cell->back()->asScriptInset() &&
 959                                         !cell->back()->asScriptInset()->has(up))
 960                                 cell->back().nucleus()->asScriptInset()->ensure(up);
 961                         else if (cell->back()->asScriptInset())
 962                                 cell->push_back(MathAtom(new InsetMathScript(buf, up)));
 963                         else
 964                                 cell->back() = MathAtom(new InsetMathScript(buf, cell->back(), up));
 965                         InsetMathScript * p = cell->back().nucleus()->asScriptInset();
 966                         // special handling of {}-bases
 967                         // Here we could remove the brace inset for things
 968                         // like {a'}^2 and add the braces back in
 969                         // InsetMathScript::write().
 970                         // We do not do it, since it is not possible to detect
 971                         // reliably whether the braces are needed because the
 972                         // nucleus contains more than one symbol, or whether
 973                         // they are needed for unknown commands like \xx{a}_0
 974                         // or \yy{a}{b}_0. This was done in revision 14819
 975                         // in an unreliable way. See this thread
 976                         // http://www.mail-archive.com/lyx-devel%40lists.lyx.org/msg104917.html
 977                         // for more details.
 978                         // However, we remove empty braces because they look
 979                         // ugly on screen and we are sure that they were added
 980                         // by the write() method (and will be re-added on save).
 981                         if (p->nuc().size() == 1 &&
 982                             p->nuc().back()->asBraceInset() &&
 983                             p->nuc().back()->asBraceInset()->cell(0).empty())
 984                                 p->nuc().erase(0);
 985
 986                         parse(p->cell(p->idxOfScript(up)), FLAG_ITEM, mode);
 987                         if (limits) {
 988                                 p->limits(limits);
 989                                 limits = 0;
 990                         }
 991                 }
 992
 993                 else if (t.character() == ']' && (flags & FLAG_BRACK_LAST)) {
 994                         //lyxerr << "finished reading option" << endl;
 995                         return success_;
 996                 }
 997
 998                 else if (t.cat() == catOther) {
 999                         char_type c = t.character();
1000                         if (isAsciiOrMathAlpha(c)
1001                             || mode_ & Parse::VERBATIM
1002                             || !(mode_ & Parse::USETEXT)
1003                             || mode == InsetMath::TEXT_MODE) {
1004                                 cell->push_back(MathAtom(new InsetMathChar(c)));
1005                         } else {
1006                                 MathAtom at = createInsetMath("text", buf);
1007                                 at.nucleus()->cell(0).push_back(MathAtom(new InsetMathChar(c)));
1008                                 while (nextToken().cat() == catOther
1009                                        && !isAsciiOrMathAlpha(nextToken().character())) {
1010                                         c = getToken().character();
1011                                         at.nucleus()->cell(0).push_back(MathAtom(new InsetMathChar(c)));
1012                                 }
1013                                 cell->push_back(at);
1014                         }
1015                 }
1016
1017                 else if (t.cat() == catComment) {
1018                         docstring s;
1019                         while (good()) {
1020                                 Token const & t = getToken();
1021                                 if (t.cat() == catNewline)
1022                                         break;
1023                                 s += t.asInput();
1024                         }
1025                         cell->push_back(MathAtom(new InsetMathComment(buf, s)));
1026                         skipSpaces();
1027                 }
1028
1029                 //
1030                 // control sequences
1031                 //
1032
1033                 else if (t.cs() == "lyxlock") {
1034                         if (!cell->empty())
1035                                 cell->back().nucleus()->lock(true);
1036                 }
1037
1038                 else if ((t.cs() == "global" && nextToken().cs() == "def") ||
1039                          t.cs() == "def") {
1040                         if (t.cs() == "global")
1041                                 getToken();
1042
1043                         // get name
1044                         docstring name = getToken().cs();
1045
1046                         // read parameters
1047                         int nargs = 0;
1048                         docstring pars;
1049                         while (good() && nextToken().cat() != catBegin) {
1050                                 pars += getToken().cs();
1051                                 ++nargs;
1052                         }
1053                         nargs /= 2;
1054
1055                         // read definition
1056                         MathData def;
1057                         parse(def, FLAG_ITEM, InsetMath::UNDECIDED_MODE);
1058
1059                         // is a version for display attached?
1060                         skipSpaces();
1061                         MathData display;
1062                         if (nextToken().cat() == catBegin)
1063                                 parse(display, FLAG_ITEM, InsetMath::MATH_MODE);
1064
1065                         cell->push_back(MathAtom(new MathMacroTemplate(buf,
1066                                 name, nargs, 0, MacroTypeDef,
1067                                 vector<MathData>(), def, display)));
1068
1069                         if (buf && (mode_ & Parse::TRACKMACRO))
1070                                 buf->usermacros.insert(name);
1071                 }
1072
1073                 else if (t.cs() == "newcommand" ||
1074                          t.cs() == "renewcommand" ||
1075                          t.cs() == "newlyxcommand") {
1076                         // get name
1077                         if (getToken().cat() != catBegin) {
1078                                 error("'{' in \\newcommand expected (1) ");
1079                                 return success_;
1080                         }
1081                         docstring name = getToken().cs();
1082                         if (getToken().cat() != catEnd) {
1083                                 error("'}' in \\newcommand expected");
1084                                 return success_;
1085                         }
1086
1087                         // get arity
1088                         docstring const arg = getArg('[', ']');
1089                         int nargs = 0;
1090                         if (!arg.empty())
1091                                 nargs = convert<int>(arg);
1092
1093                         // optional argument given?
1094                         skipSpaces();
1095                         int optionals = 0;
1096                         vector<MathData> optionalValues;
1097                         while (nextToken().character() == '[') {
1098                                 getToken();
1099                                 optionalValues.push_back(MathData());
1100                                 parse(optionalValues[optionals], FLAG_BRACK_LAST, mode);
1101                                 ++optionals;
1102                         }
1103
1104                         MathData def;
1105                         parse(def, FLAG_ITEM, InsetMath::UNDECIDED_MODE);
1106
1107                         // is a version for display attached?
1108                         skipSpaces();
1109                         MathData display;
1110                         if (nextToken().cat() == catBegin)
1111                                 parse(display, FLAG_ITEM, InsetMath::MATH_MODE);
1112
1113                         cell->push_back(MathAtom(new MathMacroTemplate(buf,
1114                                 name, nargs, optionals, MacroTypeNewcommand,
1115                                 optionalValues, def, display)));
1116
1117                         if (buf && (mode_ & Parse::TRACKMACRO))
1118                                 buf->usermacros.insert(name);
1119                 }
1120
1121                 else if (t.cs() == "newcommandx" ||
1122                          t.cs() == "renewcommandx") {
1123                         // \newcommandx{\foo}[2][usedefault, addprefix=\global,1=default]{#1,#2}
1124                         // get name
1125                         docstring name;
1126                         if (nextToken().cat() == catBegin) {
1127                                 getToken();
1128                                 name = getToken().cs();
1129                                 if (getToken().cat() != catEnd) {
1130                                         error("'}' in \\newcommandx expected");
1131                                         return success_;
1132                                 }
1133                         } else
1134                                 name = getToken().cs();
1135
1136                         // get arity
1137                         docstring const arg = getArg('[', ']');
1138                         if (arg.empty()) {
1139                                 error("[num] in \\newcommandx expected");
1140                                 return success_;
1141                         }
1142                         int nargs = convert<int>(arg);
1143
1144                         // get options
1145                         int optionals = 0;
1146                         vector<MathData> optionalValues;
1147                         if (nextToken().character() == '[') {
1148                                 // skip '['
1149                                 getToken();
1150
1151                                 // handle 'opt=value' options, separated by ','.
1152                                 skipSpaces();
1153                                 while (nextToken().character() != ']' && good()) {
1154                                         if (nextToken().character() >= '1'
1155                                             && nextToken().character() <= '9') {
1156                                                 // optional value -> get parameter number
1157                                                 int n = getChar() - '0';
1158                                                 if (n > nargs) {
1159                                                         error("Arity of \\newcommandx too low "
1160                                                               "for given optional parameter.");
1161                                                         return success_;
1162                                                 }
1163
1164                                                 // skip '='
1165                                                 if (getToken().character() != '=') {
1166                                                         error("'=' and optional parameter value "
1167                                                               "expected for \\newcommandx");
1168                                                         return success_;
1169                                                 }
1170
1171                                                 // get value
1172                                                 int optNum = max(size_t(n), optionalValues.size());
1173                                                 optionalValues.resize(optNum);
1174                                                 optionalValues[n - 1].clear();
1175                                                 while (nextToken().character() != ']'
1176                                                        && nextToken().character() != ',') {
1177                                                         MathData data;
1178                                                         parse(data, FLAG_ITEM, InsetMath::UNDECIDED_MODE);
1179                                                         optionalValues[n - 1].append(data);
1180                                                 }
1181                                                 optionals = max(n, optionals);
1182                                         } else if (nextToken().cat() == catLetter) {
1183                                                 // we in fact ignore every non-optional
1184                                                 // parameter
1185
1186                                                 // get option name
1187                                                 docstring opt;
1188                                                 while (nextToken().cat() == catLetter)
1189                                                         opt += getChar();
1190
1191                                                 // value?
1192                                                 skipSpaces();
1193                                                 MathData value;
1194                                                 if (nextToken().character() == '=') {
1195                                                         getToken();
1196                                                         while (nextToken().character() != ']'
1197                                                                 && nextToken().character() != ',')
1198                                                                 parse(value, FLAG_ITEM,
1199                                                                       InsetMath::UNDECIDED_MODE);
1200                                                 }
1201                                         } else {
1202                                                 error("option for \\newcommandx expected");
1203                                                 return success_;
1204                                         }
1205
1206                                         // skip komma
1207                                         skipSpaces();
1208                                         if (nextToken().character() == ',') {
1209                                                 getChar();
1210                                                 skipSpaces();
1211                                         } else if (nextToken().character() != ']') {
1212                                                 error("Expecting ',' or ']' in options "
1213                                                       "of \\newcommandx");
1214                                                 return success_;
1215                                         }
1216                                 }
1217
1218                                 // skip ']'
1219                                 if (!good())
1220                                         return success_;
1221                                 getToken();
1222                         }
1223
1224                         // get definition
1225                         MathData def;
1226                         parse(def, FLAG_ITEM, InsetMath::UNDECIDED_MODE);
1227
1228                         // is a version for display attached?
1229                         skipSpaces();
1230                         MathData display;
1231                         if (nextToken().cat() == catBegin)
1232                                 parse(display, FLAG_ITEM, InsetMath::MATH_MODE);
1233
1234                         cell->push_back(MathAtom(new MathMacroTemplate(buf,
1235                                 name, nargs, optionals, MacroTypeNewcommandx,
1236                                 optionalValues, def, display)));
1237
1238                         if (buf && (mode_ & Parse::TRACKMACRO))
1239                                 buf->usermacros.insert(name);
1240                 }
1241
1242                 else if (t.cs() == "(") {
1243                         if (mode == InsetMath::UNDECIDED_MODE) {
1244                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullSimple)));
1245                                 parse2(cell->back(), FLAG_SIMPLE2, InsetMath::MATH_MODE, false);
1246                         } else {
1247                                 // Don't create nested math hulls (bug #5392)
1248                                 cell->push_back(MathAtom(new InsetMathEnsureMath(buf)));
1249                                 parse(cell->back().nucleus()->cell(0), FLAG_SIMPLE2, InsetMath::MATH_MODE);
1250                         }
1251                 }
1252
1253                 else if (t.cs() == "[") {
1254                         if (mode != InsetMath::UNDECIDED_MODE) {
1255                                 error("bad math environment [");
1256                                 break;
1257                         }
1258                         cell->push_back(MathAtom(new InsetMathHull(buf, hullEquation)));
1259                         parse2(cell->back(), FLAG_EQUATION, InsetMath::MATH_MODE, false);
1260                 }
1261
1262                 else if (t.cs() == "protect")
1263                         // ignore \\protect, will hopefully be re-added during output
1264                         ;
1265
1266                 else if (t.cs() == "end") {
1267                         if (flags & FLAG_END) {
1268                                 // eat environment name
1269                                 docstring const name = getArg('{', '}');
1270                                 if (environments_.empty())
1271                                         error("'found \\end{" + name +
1272                                               "}' without matching '\\begin{" +
1273                                               name + "}'");
1274                                 else if (name != environments_.back())
1275                                         error("'\\end{" + name +
1276                                               "}' does not match '\\begin{" +
1277                                               environments_.back() + "}'");
1278                                 else {
1279                                         environments_.pop_back();
1280                                         // Delete empty last row in matrix
1281                                         // like insets.
1282                                         // If you abuse InsetMathGrid for
1283                                         // non-matrix like structures you
1284                                         // probably need to refine this test.
1285                                         // Right now we only have to test for
1286                                         // single line hull insets.
1287                                         if (grid.nrows() > 1 && innerHull(name))
1288                                                 delEmptyLastRow(grid);
1289                                         return success_;
1290                                 }
1291                         } else
1292                                 error("found 'end' unexpectedly");
1293                 }
1294
1295                 else if (t.cs() == ")") {
1296                         if (flags & FLAG_SIMPLE2)
1297                                 return success_;
1298                         error("found '\\)' unexpectedly");
1299                 }
1300
1301                 else if (t.cs() == "]") {
1302                         if (flags & FLAG_EQUATION)
1303                                 return success_;
1304                         error("found '\\]' unexpectedly");
1305                 }
1306
1307                 else if (t.cs() == "\\") {
1308                         if (flags & FLAG_ALIGN)
1309                                 return success_;
1310                         bool added = false;
1311                         if (nextToken().asInput() == "*") {
1312                                 getToken();
1313                                 added = addRow(grid, cellrow, docstring(), false);
1314                         } else if (good())
1315                                 added = addRow(grid, cellrow, getArg('[', ']'));
1316                         else
1317                                 error("missing token after \\\\");
1318                         if (added) {
1319                                 cellcol = 0;
1320                                 if (grid.asHullInset())
1321                                         grid.asHullInset()->numbered(
1322                                                         cellrow, numbered);
1323                                 cell = &grid.cell(grid.index(cellrow,
1324                                                              cellcol));
1325                         }
1326                 }
1327
1328 #if 0
1329                 else if (t.cs() == "multicolumn") {
1330                         // extract column count and insert dummy cells
1331                         MathData count;
1332                         parse(count, FLAG_ITEM, mode);
1333                         int cols = 1;
1334                         if (!extractNumber(count, cols)) {
1335                                 success_ = false;
1336                                 lyxerr << " can't extract number of cells from " << count << endl;
1337                         }
1338                         // resize the table if necessary
1339                         for (int i = 0; i < cols; ++i) {
1340                                 if (addCol(grid, cellcol)) {
1341                                         cell = &grid.cell(grid.index(
1342                                                         cellrow, cellcol));
1343                                         // mark this as dummy
1344                                         grid.cellinfo(grid.index(
1345                                                 cellrow, cellcol)).dummy_ = true;
1346                                 }
1347                         }
1348                         // the last cell is the real thing, not a dummy
1349                         grid.cellinfo(grid.index(cellrow, cellcol)).dummy_ = false;
1350
1351                         // read special alignment
1352                         MathData align;
1353                         parse(align, FLAG_ITEM, mode);
1354                         //grid.cellinfo(grid.index(cellrow, cellcol)).align_ = extractString(align);
1355
1356                         // parse the remaining contents into the "real" cell
1357                         parse(*cell, FLAG_ITEM, mode);
1358                 }
1359 #endif
1360
1361                 else if (t.cs() == "limits" || t.cs() == "nolimits") {
1362                         CatCode const cat = nextToken().cat();
1363                         if (cat == catSuper || cat == catSub)
1364                                 limits = t.cs() == "limits" ? 1 : -1;
1365                         else {
1366                                 MathAtom at = createInsetMath(t.cs(), buf);
1367                                 cell->push_back(at);
1368                         }
1369                 }
1370
1371                 else if (t.cs() == "nonumber") {
1372                         if (grid.asHullInset())
1373                                 grid.asHullInset()->numbered(cellrow, false);
1374                 }
1375
1376                 else if (t.cs() == "number") {
1377                         if (grid.asHullInset())
1378                                 grid.asHullInset()->numbered(cellrow, true);
1379                 }
1380
1381                 else if (t.cs() == "hline") {
1382                         grid.rowinfo(cellrow).lines_ ++;
1383                 }
1384
1385                 else if (t.cs() == "sqrt") {
1386                         MathData ar;
1387                         parse(ar, FLAG_OPTION, mode);
1388                         if (!ar.empty()) {
1389                                 cell->push_back(MathAtom(new InsetMathRoot(buf)));
1390                                 cell->back().nucleus()->cell(0) = ar;
1391                                 parse(cell->back().nucleus()->cell(1), FLAG_ITEM, mode);
1392                         } else {
1393                                 cell->push_back(MathAtom(new InsetMathSqrt(buf)));
1394                                 parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1395                         }
1396                 }
1397
1398                 else if (t.cs() == "cancelto") {
1399                         MathData ar;
1400                         parse(ar, FLAG_ITEM, mode);
1401                                 cell->push_back(MathAtom(new InsetMathCancelto(buf)));
1402                                 cell->back().nucleus()->cell(1) = ar;
1403                                 parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1404                 }
1405
1406                 else if (t.cs() == "unit") {
1407                         // Allowed formats \unit[val]{unit}
1408                         MathData ar;
1409                         parse(ar, FLAG_OPTION, mode);
1410                         if (!ar.empty()) {
1411                                 cell->push_back(MathAtom(new InsetMathFrac(buf, InsetMathFrac::UNIT)));
1412                                 cell->back().nucleus()->cell(0) = ar;
1413                                 parse(cell->back().nucleus()->cell(1), FLAG_ITEM, mode);
1414                         } else {
1415                                 cell->push_back(MathAtom(new InsetMathFrac(buf, InsetMathFrac::UNIT, 1)));
1416                                 parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1417                         }
1418                 }
1419
1420                 else if (t.cs() == "unitfrac") {
1421                         // Here allowed formats are \unitfrac[val]{num}{denom}
1422                         MathData ar;
1423                         parse(ar, FLAG_OPTION, mode);
1424                         if (!ar.empty()) {
1425                                 cell->push_back(MathAtom(new InsetMathFrac(buf, InsetMathFrac::UNITFRAC, 3)));
1426                                 cell->back().nucleus()->cell(2) = ar;
1427                         } else {
1428                                 cell->push_back(MathAtom(new InsetMathFrac(buf, InsetMathFrac::UNITFRAC)));
1429                         }
1430                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1431                         parse(cell->back().nucleus()->cell(1), FLAG_ITEM, mode);
1432                 }
1433
1434                 else if (t.cs() == "cfrac") {
1435                         // allowed formats are \cfrac[pos]{num}{denom}
1436                         docstring const arg = getArg('[', ']');
1437                         //lyxerr << "got so far: '" << arg << "'" << endl;
1438                                 if (arg == "l")
1439                                         cell->push_back(MathAtom(new InsetMathFrac(buf, InsetMathFrac::CFRACLEFT)));
1440                                 else if (arg == "r")
1441                                         cell->push_back(MathAtom(new InsetMathFrac(buf, InsetMathFrac::CFRACRIGHT)));
1442                                 else if (arg.empty() || arg == "c")
1443                                         cell->push_back(MathAtom(new InsetMathFrac(buf, InsetMathFrac::CFRAC)));
1444                                 else {
1445                                         error("found invalid optional argument");
1446                                         break;
1447                                 }
1448                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1449                         parse(cell->back().nucleus()->cell(1), FLAG_ITEM, mode);
1450                 }
1451
1452                 else if (t.cs() == "sideset") {
1453                         // Here allowed formats are \sideset{_{bl}^{tl}}{_{br}^{tr}}{operator}
1454                         MathData ar[2];
1455                         InsetMathScript * script[2] = {0, 0};
1456                         for (int i = 0; i < 2; ++i) {
1457                                 parse(ar[i], FLAG_ITEM, mode);
1458                                 if (ar[i].size() == 1)
1459                                         script[i] = ar[i][0].nucleus()->asScriptInset();
1460                         }
1461                         bool const hasscript[2] = {script[0] ? true : false, script[1] ? true : false};
1462                         cell->push_back(MathAtom(new InsetMathSideset(buf, hasscript[0], hasscript[1])));
1463                         if (hasscript[0]) {
1464                                 if (script[0]->hasDown())
1465                                         cell->back().nucleus()->cell(1) = script[0]->down();
1466                                 if (script[0]->hasUp())
1467                                         cell->back().nucleus()->cell(2) = script[0]->up();
1468                         } else
1469                                 cell->back().nucleus()->cell(1) = ar[0];
1470                         if (hasscript[1]) {
1471                                 if (script[1]->hasDown())
1472                                         cell->back().nucleus()->cell(2 + hasscript[0]) = script[1]->down();
1473                                 if (script[1]->hasUp())
1474                                         cell->back().nucleus()->cell(3 + hasscript[0]) = script[1]->up();
1475                         } else
1476                                 cell->back().nucleus()->cell(2 + hasscript[0]) = ar[1];
1477                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1478                 }
1479
1480                 else if (t.cs() == "stackrel") {
1481                         // Here allowed formats are \stackrel[subscript]{superscript}{operator}
1482                         MathData ar;
1483                         parse(ar, FLAG_OPTION, mode);
1484                         cell->push_back(MathAtom(new InsetMathStackrel(buf, !ar.empty())));
1485                         if (!ar.empty())
1486                                 cell->back().nucleus()->cell(2) = ar;
1487                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1488                         parse(cell->back().nucleus()->cell(1), FLAG_ITEM, mode);
1489                 }
1490
1491                 else if (t.cs() == "xrightarrow" || t.cs() == "xleftarrow") {
1492                         cell->push_back(createInsetMath(t.cs(), buf));
1493                         parse(cell->back().nucleus()->cell(1), FLAG_OPTION, mode);
1494                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1495                 }
1496
1497                 else if (t.cs() == "ref" || t.cs() == "eqref" || t.cs() == "prettyref"
1498                           || t.cs() == "pageref" || t.cs() == "vpageref" || t.cs() == "vref") {
1499                         cell->push_back(MathAtom(new InsetMathRef(buf, t.cs())));
1500                         docstring const opt = parse_verbatim_option();
1501                         docstring const ref = parse_verbatim_item();
1502                         if (!opt.empty()) {
1503                                 cell->back().nucleus()->cell(1).push_back(
1504                                         MathAtom(new InsetMathString(opt)));
1505                         }
1506                         cell->back().nucleus()->cell(0).push_back(
1507                                         MathAtom(new InsetMathString(ref)));
1508                 }
1509
1510                 else if (t.cs() == "left") {
1511                         skipSpaces();
1512                         Token const & tl = getToken();
1513                         // \| and \Vert are equivalent, and InsetMathDelim
1514                         // can't handle \|
1515                         // FIXME: fix this in InsetMathDelim itself!
1516                         docstring const l = tl.cs() == "|" ? from_ascii("Vert") : tl.asString();
1517                         MathData ar;
1518                         parse(ar, FLAG_RIGHT, mode);
1519                         if (!good())
1520                                 break;
1521                         skipSpaces();
1522                         Token const & tr = getToken();
1523                         docstring const r = tr.cs() == "|" ? from_ascii("Vert") : tr.asString();
1524                         cell->push_back(MathAtom(new InsetMathDelim(buf, l, r, ar)));
1525                 }
1526
1527                 else if (t.cs() == "right") {
1528                         if (flags & FLAG_RIGHT)
1529                                 return success_;
1530                         //lyxerr << "got so far: '" << cell << "'" << endl;
1531                         error("Unmatched right delimiter");
1532                         return success_;
1533                 }
1534
1535                 else if (t.cs() == "begin") {
1536                         docstring const name = getArg('{', '}');
1537
1538                         if (name.empty()) {
1539                                 success_ = false;
1540                                 error("found invalid environment");
1541                                 return success_;
1542                         }
1543
1544                         environments_.push_back(name);
1545
1546                         if (name == "array" || name == "subarray") {
1547                                 docstring const valign = parse_verbatim_option() + 'c';
1548                                 docstring const halign = parse_verbatim_item();
1549                                 cell->push_back(MathAtom(new InsetMathArray(buf, name,
1550                                         InsetMathGrid::guessColumns(halign), 1, (char)valign[0], halign)));
1551                                 parse2(cell->back(), FLAG_END, mode, false);
1552                         }
1553
1554                         else if (name == "tabular") {
1555                                 docstring const valign = parse_verbatim_option() + 'c';
1556                                 docstring const halign = parse_verbatim_item();
1557                                 cell->push_back(MathAtom(new InsetMathTabular(buf, name,
1558                                         InsetMathGrid::guessColumns(halign), 1, (char)valign[0], halign)));
1559                                 parse2(cell->back(), FLAG_END, InsetMath::TEXT_MODE, false);
1560                         }
1561
1562                         else if (name == "split" || name == "cases") {
1563                                 cell->push_back(createInsetMath(name, buf));
1564                                 parse2(cell->back(), FLAG_END, mode, false);
1565                         }
1566
1567                         else if (name == "alignedat") {
1568                                 docstring const valign = parse_verbatim_option() + 'c';
1569                                 // ignore this for a while
1570                                 getArg('{', '}');
1571                                 cell->push_back(MathAtom(new InsetMathSplit(buf, name, (char)valign[0])));
1572                                 parse2(cell->back(), FLAG_END, mode, false);
1573                         }
1574
1575                         else if (name == "math") {
1576                                 if (mode == InsetMath::UNDECIDED_MODE) {
1577                                         cell->push_back(MathAtom(new InsetMathHull(buf, hullSimple)));
1578                                         parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, false);
1579                                 } else {
1580                                         // Don't create nested math hulls (bug #5392)
1581                                         cell->push_back(MathAtom(new InsetMathEnsureMath(buf)));
1582                                         parse(cell->back().nucleus()->cell(0), FLAG_END, InsetMath::MATH_MODE);
1583                                 }
1584                         }
1585
1586                         else if (name == "equation" || name == "equation*"
1587                                         || name == "displaymath") {
1588                                 if (mode != InsetMath::UNDECIDED_MODE) {
1589                                         error("bad math environment " + name);
1590                                         break;
1591                                 }
1592                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullEquation)));
1593                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, (name == "equation"));
1594                         }
1595
1596                         else if (name == "eqnarray" || name == "eqnarray*") {
1597                                 if (mode != InsetMath::UNDECIDED_MODE) {
1598                                         error("bad math environment " + name);
1599                                         break;
1600                                 }
1601                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullEqnArray)));
1602                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1603                         }
1604
1605                         else if (name == "align" || name == "align*") {
1606                                 if (mode == InsetMath::UNDECIDED_MODE) {
1607                                         cell->push_back(MathAtom(new InsetMathHull(buf, hullAlign)));
1608                                         parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1609                                 } else {
1610                                         cell->push_back(MathAtom(new InsetMathSplit(buf, name,
1611                                                         'c', !stared(name))));
1612                                         parse2(cell->back(), FLAG_END, mode, !stared(name));
1613                                 }
1614                         }
1615
1616                         else if (name == "flalign" || name == "flalign*") {
1617                                 if (mode != InsetMath::UNDECIDED_MODE) {
1618                                         error("bad math environment " + name);
1619                                         break;
1620                                 }
1621                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullFlAlign)));
1622                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1623                         }
1624
1625                         else if (name == "alignat" || name == "alignat*") {
1626                                 if (mode != InsetMath::UNDECIDED_MODE) {
1627                                         error("bad math environment " + name);
1628                                         break;
1629                                 }
1630                                 // ignore this for a while
1631                                 getArg('{', '}');
1632                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullAlignAt)));
1633                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1634                         }
1635
1636                         else if (name == "xalignat" || name == "xalignat*") {
1637                                 if (mode != InsetMath::UNDECIDED_MODE) {
1638                                         error("bad math environment " + name);
1639                                         break;
1640                                 }
1641                                 // ignore this for a while
1642                                 getArg('{', '}');
1643                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullXAlignAt)));
1644                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1645                         }
1646
1647                         else if (name == "xxalignat") {
1648                                 if (mode != InsetMath::UNDECIDED_MODE) {
1649                                         error("bad math environment " + name);
1650                                         break;
1651                                 }
1652                                 // ignore this for a while
1653                                 getArg('{', '}');
1654                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullXXAlignAt)));
1655                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1656                         }
1657
1658                         else if (name == "multline" || name == "multline*") {
1659                                 if (mode != InsetMath::UNDECIDED_MODE) {
1660                                         error("bad math environment " + name);
1661                                         break;
1662                                 }
1663                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullMultline)));
1664                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1665                         }
1666
1667                         else if (name == "gather" || name == "gather*") {
1668                                 if (mode != InsetMath::UNDECIDED_MODE) {
1669                                         error("bad math environment " + name);
1670                                         break;
1671                                 }
1672                                 cell->push_back(MathAtom(new InsetMathHull(buf, hullGather)));
1673                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1674                         }
1675
1676                         else if (latexkeys const * l = in_word_set(name)) {
1677                                 if (l->inset == "matrix") {
1678                                         cell->push_back(createInsetMath(name, buf));
1679                                         parse2(cell->back(), FLAG_END, mode, false);
1680                                 } else if (l->inset == "split") {
1681                                         docstring const valign = parse_verbatim_option() + 'c';
1682                                         cell->push_back(MathAtom(
1683                                                 new InsetMathSplit(buf, name, (char)valign[0])));
1684                                         parse2(cell->back(), FLAG_END, mode, false);
1685                                 } else {
1686                                         success_ = false;
1687                                         if (!(mode_ & Parse::QUIET)) {
1688                                                 dump();
1689                                                 lyxerr << "found math environment `"
1690                                                        << to_utf8(name)
1691                                                        << "' in symbols file with unsupported inset `"
1692                                                        << to_utf8(l->inset)
1693                                                        << "'." << endl;
1694                                         }
1695                                         // create generic environment inset
1696                                         cell->push_back(MathAtom(new InsetMathEnv(buf, name)));
1697                                         parse(cell->back().nucleus()->cell(0), FLAG_END, mode);
1698                                 }
1699                         }
1700
1701                         else {
1702                                 success_ = false;
1703                                 if (!(mode_ & Parse::QUIET)) {
1704                                         dump();
1705                                         lyxerr << "found unknown math environment '"
1706                                                << to_utf8(name) << "'" << endl;
1707                                 }
1708                                 // create generic environment inset
1709                                 cell->push_back(MathAtom(new InsetMathEnv(buf, name)));
1710                                 parse(cell->back().nucleus()->cell(0), FLAG_END, mode);
1711                         }
1712                 }
1713
1714                 else if (t.cs() == "kern") {
1715                         // FIXME: A hack...
1716                         docstring s;
1717                         int num_tokens = 0;
1718                         while (true) {
1719                                 Token const & t = getToken();
1720                                 ++num_tokens;
1721                                 if (!good()) {
1722                                         s.clear();
1723                                         while (num_tokens--)
1724                                                 putback();
1725                                         break;
1726                                 }
1727                                 s += t.character();
1728                                 if (isValidLength(to_utf8(s)))
1729                                         break;
1730                         }
1731                         if (s.empty())
1732                                 cell->push_back(MathAtom(new InsetMathKern));
1733                         else
1734                                 cell->push_back(MathAtom(new InsetMathKern(s)));
1735                 }
1736
1737                 else if (t.cs() == "label") {
1738                         // FIXME: This is swallowed in inline formulas
1739                         docstring label = parse_verbatim_item();
1740                         MathData ar;
1741                         asArray(label, ar);
1742                         if (grid.asHullInset()) {
1743                                 grid.asHullInset()->label(cellrow, label);
1744                         } else {
1745                                 cell->push_back(createInsetMath(t.cs(), buf));
1746                                 cell->push_back(MathAtom(new InsetMathBrace(ar)));
1747                         }
1748                 }
1749
1750                 else if (t.cs() == "choose" || t.cs() == "over"
1751                                 || t.cs() == "atop" || t.cs() == "brace"
1752                                 || t.cs() == "brack") {
1753                         MathAtom at = createInsetMath(t.cs(), buf);
1754                         at.nucleus()->cell(0) = *cell;
1755                         cell->clear();
1756                         parse(at.nucleus()->cell(1), flags, mode);
1757                         cell->push_back(at);
1758                         return success_;
1759                 }
1760
1761                 else if (t.cs() == "color") {
1762                         docstring const color = parse_verbatim_item();
1763                         cell->push_back(MathAtom(new InsetMathColor(buf, true, color)));
1764                         parse(cell->back().nucleus()->cell(0), flags, mode);
1765                         return success_;
1766                 }
1767
1768                 else if (t.cs() == "textcolor") {
1769                         docstring const color = parse_verbatim_item();
1770                         cell->push_back(MathAtom(new InsetMathColor(buf, false, color)));
1771                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, InsetMath::TEXT_MODE);
1772                 }
1773
1774                 else if (t.cs() == "normalcolor") {
1775                         cell->push_back(createInsetMath(t.cs(), buf));
1776                         parse(cell->back().nucleus()->cell(0), flags, mode);
1777                         return success_;
1778                 }
1779
1780                 else if (t.cs() == "substack") {
1781                         cell->push_back(createInsetMath(t.cs(), buf));
1782                         parse2(cell->back(), FLAG_ITEM, mode, false);
1783                         // Delete empty last row if present
1784                         InsetMathGrid & subgrid =
1785                                 *(cell->back().nucleus()->asGridInset());
1786                         if (subgrid.nrows() > 1)
1787                                 delEmptyLastRow(subgrid);
1788                 }
1789
1790                 else if (t.cs() == "xymatrix") {
1791                         odocstringstream os;
1792                         while (good() && nextToken().cat() != catBegin)
1793                                 os << getToken().asInput();
1794                         cell->push_back(createInsetMath(t.cs() + os.str(), buf));
1795                         parse2(cell->back(), FLAG_ITEM, mode, false);
1796                         // Delete empty last row if present
1797                         InsetMathGrid & subgrid =
1798                                 *(cell->back().nucleus()->asGridInset());
1799                         if (subgrid.nrows() > 1)
1800                                 delEmptyLastRow(subgrid);
1801                 }
1802
1803                 else if (t.cs() == "Diagram") {
1804                         odocstringstream os;
1805                         while (good() && nextToken().cat() != catBegin)
1806                                 os << getToken().asInput();
1807                         cell->push_back(createInsetMath(t.cs() + os.str(), buf));
1808                         parse2(cell->back(), FLAG_ITEM, mode, false);
1809                 }
1810
1811                 else if (t.cs() == "framebox" || t.cs() == "makebox") {
1812                         cell->push_back(createInsetMath(t.cs(), buf));
1813                         parse(cell->back().nucleus()->cell(0), FLAG_OPTION, InsetMath::TEXT_MODE);
1814                         parse(cell->back().nucleus()->cell(1), FLAG_OPTION, InsetMath::TEXT_MODE);
1815                         parse(cell->back().nucleus()->cell(2), FLAG_ITEM, InsetMath::TEXT_MODE);
1816                 }
1817
1818                 else if (t.cs() == "tag") {
1819                         if (nextToken().character() == '*') {
1820                                 getToken();
1821                                 cell->push_back(createInsetMath(t.cs() + '*', buf));
1822                         } else
1823                                 cell->push_back(createInsetMath(t.cs(), buf));
1824                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, InsetMath::TEXT_MODE);
1825                 }
1826
1827                 else if (t.cs() == "hspace") {
1828                         bool const prot =  nextToken().character() == '*';
1829                         if (prot)
1830                                 getToken();
1831                         docstring const name = t.cs();
1832                         docstring const arg = parse_verbatim_item();
1833                         Length length;
1834                         if (prot && arg == "\\fill")
1835                                 cell->push_back(MathAtom(new InsetMathSpace("hspace*{\\fill}", "")));
1836                         else if (isValidLength(to_utf8(arg), &length))
1837                                 cell->push_back(MathAtom(new InsetMathSpace(length, prot)));
1838                         else {
1839                                 // Since the Length class cannot use length variables
1840                                 // we must not create an InsetMathSpace.
1841                                 cell->push_back(MathAtom(new MathMacro(buf, name)));
1842                                 MathData ar;
1843                                 mathed_parse_cell(ar, '{' + arg + '}', mode_);
1844                                 cell->append(ar);
1845                         }
1846                 }
1847
1848                 else if (t.cs() == "smash") {
1849                         skipSpaces();
1850                         if (nextToken().asInput() == "[") {
1851                                 // Since the phantom inset cannot handle optional arguments
1852                                 // we must not create an InsetMathPhantom (bug 8967).
1853                                 docstring const opt = parse_verbatim_option();
1854                                 docstring const arg = parse_verbatim_item();
1855                                 cell->push_back(MathAtom(new MathMacro(buf, t.cs())));
1856                                 MathData ar;
1857                                 mathed_parse_cell(ar, '[' + opt + ']', mode_);
1858                                 cell->append(ar);
1859                                 ar = MathData();
1860                                 mathed_parse_cell(ar, '{' + arg + '}', mode_);
1861                                 cell->append(ar);
1862                         }
1863                         else {
1864                                 cell->push_back(createInsetMath(t.cs(), buf));
1865                                 parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1866                         }
1867                 }
1868
1869 #if 0
1870                 else if (t.cs() == "infer") {
1871                         MathData ar;
1872                         parse(ar, FLAG_OPTION, mode);
1873                         cell->push_back(createInsetMath(t.cs(), buf));
1874                         parse2(cell->back(), FLAG_ITEM, mode, false);
1875                 }
1876
1877                 // Disabled
1878                 else if (1 && t.cs() == "ar") {
1879                         auto_ptr<InsetMathXYArrow> p(new InsetMathXYArrow);
1880                         // try to read target
1881                         parse(p->cell(0), FLAG_OTPTION, mode);
1882                         // try to read label
1883                         if (nextToken().cat() == catSuper || nextToken().cat() == catSub) {
1884                                 p->up_ = nextToken().cat() == catSuper;
1885                                 getToken();
1886                                 parse(p->cell(1), FLAG_ITEM, mode);
1887                                 //lyxerr << "read label: " << p->cell(1) << endl;
1888                         }
1889
1890                         cell->push_back(MathAtom(p.release()));
1891                         //lyxerr << "read cell: " << cell << endl;
1892                 }
1893 #endif
1894
1895                 else if (t.cs() == "lyxmathsym") {
1896                         skipSpaces();
1897                         if (getToken().cat() != catBegin) {
1898                                 error("'{' expected in \\" + t.cs());
1899                                 return success_;
1900                         }
1901                         int count = 0;
1902                         docstring cmd;
1903                         CatCode cat = nextToken().cat();
1904                         while (good() && (count || cat != catEnd)) {
1905                                 if (cat == catBegin)
1906                                         ++count;
1907                                 else if (cat == catEnd)
1908                                         --count;
1909                                 cmd += getToken().asInput();
1910                                 cat = nextToken().cat();
1911                         }
1912                         if (getToken().cat() != catEnd) {
1913                                 error("'}' expected in \\" + t.cs());
1914                                 return success_;
1915                         }
1916                         bool termination;
1917                         docstring rem;
1918                         do {
1919                                 cmd = Encodings::fromLaTeXCommand(cmd,
1920                                         Encodings::MATH_CMD | Encodings::TEXT_CMD,
1921                                         termination, rem);
1922                                 for (size_t i = 0; i < cmd.size(); ++i)
1923                                         cell->push_back(MathAtom(new InsetMathChar(cmd[i])));
1924                                 if (!rem.empty()) {
1925                                         char_type c = rem[0];
1926                                         cell->push_back(MathAtom(new InsetMathChar(c)));
1927                                         cmd = rem.substr(1);
1928                                         rem.clear();
1929                                 } else
1930                                         cmd.clear();
1931                         } while (!cmd.empty());
1932                 }
1933
1934                 else if (!t.cs().empty()) {
1935                         bool const no_mhchem =
1936                                 (t.cs() == "ce" || t.cs() == "cf")
1937                                 && buf && buf->params().use_package("mhchem") ==
1938                                                 BufferParams::package_off;
1939
1940                         bool const is_user_macro = no_mhchem ||
1941                                 (buf && (mode_ & Parse::TRACKMACRO
1942                                          ? buf->usermacros.count(t.cs()) != 0
1943                                          : buf->getMacro(t.cs(), false) != 0));
1944
1945                         latexkeys const * l = in_word_set(t.cs());
1946                         if (l && !is_user_macro) {
1947                                 if (l->inset == "big") {
1948                                         skipSpaces();
1949                                         docstring const delim = getToken().asInput();
1950                                         if (InsetMathBig::isBigInsetDelim(delim))
1951                                                 cell->push_back(MathAtom(
1952                                                         new InsetMathBig(t.cs(), delim)));
1953                                         else {
1954                                                 cell->push_back(createInsetMath(t.cs(), buf));
1955                                                 putback();
1956                                         }
1957                                 }
1958
1959                                 else if (l->inset == "font") {
1960                                         cell->push_back(createInsetMath(t.cs(), buf));
1961                                         parse(cell->back().nucleus()->cell(0),
1962                                                 FLAG_ITEM, asMode(mode, l->extra));
1963                                 }
1964
1965                                 else if (l->inset == "oldfont") {
1966                                         cell->push_back(createInsetMath(t.cs(), buf));
1967                                         parse(cell->back().nucleus()->cell(0),
1968                                                 flags | FLAG_ALIGN, asMode(mode, l->extra));
1969                                         if (prevToken().cat() != catAlign &&
1970                                             prevToken().cs() != "\\")
1971                                                 return success_;
1972                                         putback();
1973                                 }
1974
1975                                 else if (l->inset == "style") {
1976                                         cell->push_back(createInsetMath(t.cs(), buf));
1977                                         parse(cell->back().nucleus()->cell(0),
1978                                                 flags | FLAG_ALIGN, mode);
1979                                         if (prevToken().cat() != catAlign &&
1980                                             prevToken().cs() != "\\")
1981                                                 return success_;
1982                                         putback();
1983                                 }
1984
1985                                 else {
1986                                         MathAtom at = createInsetMath(t.cs(), buf);
1987                                         for (InsetMath::idx_type i = 0; i < at->nargs(); ++i)
1988                                                 parse(at.nucleus()->cell(i),
1989                                                         FLAG_ITEM, asMode(mode, l->extra));
1990                                         cell->push_back(at);
1991                                 }
1992                         }
1993
1994                         else {
1995                                 bool is_unicode_symbol = false;
1996                                 if (mode == InsetMath::TEXT_MODE && !is_user_macro) {
1997                                         int num_tokens = 0;
1998                                         docstring cmd = prevToken().asInput();
1999                                         CatCode cat = nextToken().cat();
2000                                         if (cat == catBegin) {
2001                                                 int count = 0;
2002                                                 while (good() && (count || cat != catEnd)) {
2003                                                         cat = nextToken().cat();
2004                                                         cmd += getToken().asInput();
2005                                                         ++num_tokens;
2006                                                         if (cat == catBegin)
2007                                                                 ++count;
2008                                                         else if (cat == catEnd)
2009                                                                 --count;
2010                                                 }
2011                                         }
2012                                         bool is_combining;
2013                                         bool termination;
2014                                         char_type c = Encodings::fromLaTeXCommand(cmd,
2015                                                 Encodings::MATH_CMD | Encodings::TEXT_CMD,
2016                                                 is_combining, termination);
2017                                         if (is_combining) {
2018                                                 if (cat == catLetter)
2019                                                         cmd += '{';
2020                                                 cmd += getToken().asInput();
2021                                                 ++num_tokens;
2022                                                 if (cat == catLetter)
2023                                                         cmd += '}';
2024                                                 c = Encodings::fromLaTeXCommand(cmd,
2025                                                         Encodings::MATH_CMD | Encodings::TEXT_CMD,
2026                                                         is_combining, termination);
2027                                         }
2028                                         if (c) {
2029                                                 if (termination) {
2030                                                         if (nextToken().cat() == catBegin) {
2031                                                                 getToken();
2032                                                                 if (nextToken().cat() == catEnd) {
2033                                                                         getToken();
2034                                                                         num_tokens += 2;
2035                                                                 } else
2036                                                                         putback();
2037                                                         } else {
2038                                                                 while (nextToken().cat() == catSpace) {
2039                                                                         getToken();
2040                                                                         ++num_tokens;
2041                                                                 }
2042                                                         }
2043                                                 }
2044                                                 is_unicode_symbol = true;
2045                                                 cell->push_back(MathAtom(new InsetMathChar(c)));
2046                                         } else {
2047                                                 while (num_tokens--)
2048                                                         putback();
2049                                         }
2050                                 }
2051                                 if (!is_unicode_symbol) {
2052                                         MathAtom at = is_user_macro ?
2053                                                 MathAtom(new MathMacro(buf, t.cs()))
2054                                                 : createInsetMath(t.cs(), buf);
2055                                         InsetMath::mode_type m = mode;
2056                                         //if (m == InsetMath::UNDECIDED_MODE)
2057                                         //lyxerr << "default creation: m1: " << m << endl;
2058                                         if (at->currentMode() != InsetMath::UNDECIDED_MODE)
2059                                                 m = at->currentMode();
2060                                         //lyxerr << "default creation: m2: " << m << endl;
2061                                         InsetMath::idx_type start = 0;
2062                                         // this fails on \bigg[...\bigg]
2063                                         //MathData opt;
2064                                         //parse(opt, FLAG_OPTION, InsetMath::VERBATIM_MODE);
2065                                         //if (!opt.empty()) {
2066                                         //      start = 1;
2067                                         //      at.nucleus()->cell(0) = opt;
2068                                         //}
2069                                         for (InsetMath::idx_type i = start; i < at->nargs(); ++i) {
2070                                                 parse(at.nucleus()->cell(i), FLAG_ITEM, m);
2071                                                 skipSpaces();
2072                                         }
2073                                         cell->push_back(at);
2074                                 }
2075                         }
2076                 }
2077
2078
2079                 if (flags & FLAG_LEAVE) {
2080                         flags &= ~FLAG_LEAVE;
2081                         break;
2082                 }
2083         }
2084         return success_;
2085 }
2086
2087
2088
2089 } // anonymous namespace
2090
2091
2092 bool mathed_parse_cell(MathData & ar, docstring const & str, Parse::flags f)
2093 {
2094         return Parser(str, f, ar.buffer()).parse(ar, 0, f & Parse::TEXTMODE ?
2095                                 InsetMath::TEXT_MODE : InsetMath::MATH_MODE);
2096 }
2097
2098
2099 bool mathed_parse_cell(MathData & ar, istream & is, Parse::flags f)
2100 {
2101         return Parser(is, f, ar.buffer()).parse(ar, 0, f & Parse::TEXTMODE ?
2102                                 InsetMath::TEXT_MODE : InsetMath::MATH_MODE);
2103 }
2104
2105
2106 bool mathed_parse_normal(Buffer * buf, MathAtom & t, docstring const & str,
2107                          Parse::flags f)
2108 {
2109         return Parser(str, f, buf).parse(t);
2110 }
2111
2112
2113 bool mathed_parse_normal(Buffer * buf, MathAtom & t, Lexer & lex,
2114                          Parse::flags f)
2115 {
2116         return Parser(lex, f, buf).parse(t);
2117 }
2118
2119
2120 bool mathed_parse_normal(InsetMathGrid & grid, docstring const & str,
2121                          Parse::flags f)
2122 {
2123         return Parser(str, f, &grid.buffer()).parse1(grid, 0, f & Parse::TEXTMODE ?
2124                         InsetMath::TEXT_MODE : InsetMath::MATH_MODE, false);
2125 }
2126
2127
2128 void initParser()
2129 {
2130         fill(theCatcode, theCatcode + 128, catOther);
2131         fill(theCatcode + 'a', theCatcode + 'z' + 1, catLetter);
2132         fill(theCatcode + 'A', theCatcode + 'Z' + 1, catLetter);
2133
2134         theCatcode[int('\\')] = catEscape;
2135         theCatcode[int('{')]  = catBegin;
2136         theCatcode[int('}')]  = catEnd;
2137         theCatcode[int('$')]  = catMath;
2138         theCatcode[int('&')]  = catAlign;
2139         theCatcode[int('\n')] = catNewline;
2140         theCatcode[int('#')]  = catParameter;
2141         theCatcode[int('^')]  = catSuper;
2142         theCatcode[int('_')]  = catSub;
2143         theCatcode[int(0x7f)] = catIgnore;
2144         theCatcode[int(' ')]  = catSpace;
2145         theCatcode[int('\t')] = catSpace;
2146         theCatcode[int('\r')] = catNewline;
2147         theCatcode[int('~')]  = catActive;
2148         theCatcode[int('%')]  = catComment;
2149 }
2150
2151
2152 } // namespace lyx