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
  30   \[\begin{array}{ccc}
  31 1
  32 &
  33
  34   \end{array}\]
  35
  36 */
  37
  38
  39 #include <config.h>
  40
  41 #include "MathParser.h"
  42
  43 #include "InsetMathArray.h"
  44 #include "InsetMathBig.h"
  45 #include "InsetMathBrace.h"
  46 #include "InsetMathChar.h"
  47 #include "InsetMathColor.h"
  48 #include "InsetMathComment.h"
  49 #include "InsetMathDelim.h"
  50 #include "InsetMathEnv.h"
  51 #include "InsetMathKern.h"
  52 #include "MathMacro.h"
  53 #include "InsetMathPar.h"
  54 #include "InsetMathRef.h"
  55 #include "InsetMathRoot.h"
  56 #include "InsetMathScript.h"
  57 #include "InsetMathSplit.h"
  58 #include "InsetMathSqrt.h"
  59 #include "InsetMathTabular.h"
  60 #include "MathMacroTemplate.h"
  61 #include "MathFactory.h"
  62 #include "MathMacroArgument.h"
  63 #include "MathSupport.h"
  64
  65 #include "Lexer.h"
  66 #include "debug.h"
  67
  68 #include "support/convert.h"
  69
  70 #include <sstream>
  71
  72
  73 namespace lyx {
  74
  75 using std::endl;
  76 using std::fill;
  77
  78 using std::string;
  79 using std::ios;
  80 using std::istream;
  81 using std::ostream;
  82 using std::vector;
  83
  84
  85 //#define FILEDEBUG
  86
  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 /*!
 109  * Add the row \p cellrow to \p grid.
 110  * \returns wether the row could be added. Adding a row can fail for
 111  * environments like "equation" that have a fixed number of rows.
 112  */
 113 bool addRow(InsetMathGrid & grid, InsetMathGrid::row_type & cellrow,
 114             docstring const & vskip, bool allow_pagebreak = true)
 115 {
 116         ++cellrow;
 117         if (cellrow == grid.nrows()) {
 118                 //lyxerr << "adding row " << cellrow << endl;
 119                 grid.addRow(cellrow - 1);
 120                 if (cellrow == grid.nrows()) {
 121                         // We can't add a row to this grid, so let's
 122                         // append the content of this cell to the previous
 123                         // one.
 124                         // This does not happen in well formed .lyx files,
 125                         // but LyX versions 1.3.x and older could create
 126                         // such files and tex2lyx can still do that.
 127                         --cellrow;
 128                         lyxerr << "ignoring extra row";
 129                         if (!vskip.empty())
 130                                 lyxerr << " with extra space " << to_utf8(vskip);
 131                         if (!allow_pagebreak)
 132                                 lyxerr << " with no page break allowed";
 133                         lyxerr << '.' << endl;
 134                         return false;
 135                 }
 136         }
 137         grid.vcrskip(Length(to_utf8(vskip)), cellrow - 1);
 138         grid.rowinfo(cellrow - 1).allow_pagebreak_ = allow_pagebreak;
 139         return true;
 140 }
 141
 142
 143 /*!
 144  * Add the column \p cellcol to \p grid.
 145  * \returns wether the column could be added. Adding a column can fail for
 146  * environments like "eqnarray" that have a fixed number of columns.
 147  */
 148 bool addCol(InsetMathGrid & grid, InsetMathGrid::col_type & cellcol)
 149 {
 150         ++cellcol;
 151         if (cellcol == grid.ncols()) {
 152                 //lyxerr << "adding column " << cellcol << endl;
 153                 grid.addCol(cellcol - 1);
 154                 if (cellcol == grid.ncols()) {
 155                         // We can't add a column to this grid, so let's
 156                         // append the content of this cell to the previous
 157                         // one.
 158                         // This does not happen in well formed .lyx files,
 159                         // but LyX versions 1.3.x and older could create
 160                         // such files and tex2lyx can still do that.
 161                         --cellcol;
 162                         lyxerr << "ignoring extra column." << endl;
 163                         return false;
 164                 }
 165         }
 166         return true;
 167 }
 168
 169
 170 /*!
 171  * Check wether the last row is empty and remove it if yes.
 172  * Otherwise the following code
 173  * \verbatim
 174 \begin{array}{|c|c|}
 175 \hline
 176 1 & 2 \\ \hline
 177 3 & 4 \\ \hline
 178 \end{array}
 179  * \endverbatim
 180  * will result in a grid with 3 rows (+ the dummy row that is always present),
 181  * because the last '\\' opens a new row.
 182  */
 183 void delEmptyLastRow(InsetMathGrid & grid)
 184 {
 185         InsetMathGrid::row_type const row = grid.nrows() - 1;
 186         for (InsetMathGrid::col_type col = 0; col < grid.ncols(); ++col) {
 187                 if (!grid.cell(grid.index(row, col)).empty())
 188                         return;
 189         }
 190         // Copy the row information of the empty row (which would contain the
 191         // last hline in the example above) to the dummy row and delete the
 192         // empty row.
 193         grid.rowinfo(row + 1) = grid.rowinfo(row);
 194         grid.delRow(row);
 195 }
 196
 197
 198 // These are TeX's catcodes
 199 enum CatCode {
 200         catEscape,     // 0    backslash
 201         catBegin,      // 1    {
 202         catEnd,        // 2    }
 203         catMath,       // 3    $
 204         catAlign,      // 4    &
 205         catNewline,    // 5    ^^M
 206         catParameter,  // 6    #
 207         catSuper,      // 7    ^
 208         catSub,        // 8    _
 209         catIgnore,     // 9
 210         catSpace,      // 10   space
 211         catLetter,     // 11   a-zA-Z
 212         catOther,      // 12   none of the above
 213         catActive,     // 13   ~
 214         catComment,    // 14   %
 215         catInvalid     // 15   <delete>
 216 };
 217
 218 CatCode theCatcode[128];
 219
 220
 221 inline CatCode catcode(char_type c)
 222 {
 223         /* The only characters that are not catOther lie in the pure ASCII
 224          * range. Therefore theCatcode has only 128 entries.
 225          * TeX itself deals with 8bit characters, so if needed this table
 226          * could be enlarged to 256 entries.
 227          * Any larger value does not make sense, since the fact that we use
 228          * unicode internally does not change Knuth's TeX engine.
 229          * Apart from that a table for the full 21bit UCS4 range would waste
 230          * too much memory. */
 231         if (c >= 128)
 232                 return catOther;
 233
 234         return theCatcode[c];
 235 }
 236
 237
 238 enum {
 239         FLAG_ALIGN      = 1 << 0,  //  next & or \\ ends the parsing process
 240         FLAG_BRACE_LAST = 1 << 1,  //  next closing brace ends the parsing
 241         FLAG_RIGHT      = 1 << 2,  //  next \\right ends the parsing process
 242         FLAG_END        = 1 << 3,  //  next \\end ends the parsing process
 243         FLAG_BRACK_LAST = 1 << 4,  //  next closing bracket ends the parsing
 244         FLAG_TEXTMODE   = 1 << 5,  //  we are in a box
 245         FLAG_ITEM       = 1 << 6,  //  read a (possibly braced token)
 246         FLAG_LEAVE      = 1 << 7,  //  leave the loop at the end
 247         FLAG_SIMPLE     = 1 << 8,  //  next $ leaves the loop
 248         FLAG_EQUATION   = 1 << 9,  //  next \] leaves the loop
 249         FLAG_SIMPLE2    = 1 << 10, //  next \) leaves the loop
 250         FLAG_OPTION     = 1 << 11, //  read [...] style option
 251         FLAG_BRACED     = 1 << 12  //  read {...} style argument
 252 };
 253
 254
 255 //
 256 // Helper class for parsing
 257 //
 258
 259 class Token {
 260 public:
 261         ///
 262         Token() : cs_(), char_(0), cat_(catIgnore) {}
 263         ///
 264         Token(char_type c, CatCode cat) : cs_(), char_(c), cat_(cat) {}
 265         ///
 266         explicit Token(docstring const & cs) : cs_(cs), char_(0), cat_(catIgnore) {}
 267
 268         ///
 269         docstring const & cs() const { return cs_; }
 270         ///
 271         CatCode cat() const { return cat_; }
 272         ///
 273         char_type character() const { return char_; }
 274         ///
 275         docstring asString() const { return cs_.size() ? cs_ : docstring(1, char_); }
 276         ///
 277         docstring asInput() const { return cs_.size() ? '\\' + cs_ : docstring(1, char_); }
 278
 279 private:
 280         ///
 281         docstring cs_;
 282         ///
 283         char_type char_;
 284         ///
 285         CatCode cat_;
 286 };
 287
 288
 289 ostream & operator<<(ostream & os, Token const & t)
 290 {
 291         if (t.cs().size()) {
 292                 docstring const & cs = t.cs();
 293                 // FIXME: For some strange reason, the stream operator instanciate
 294                 // a new Token before outputting the contents of t.cs().
 295                 // Because of this the line
 296                 //     os << '\\' << cs;
 297                 // below becomes recursive.
 298                 // In order to avoid that we return early:
 299                 if (cs == "\\")
 300                         return os;
 301                 os << '\\' << to_utf8(cs);
 302         }
 303         else if (t.cat() == catLetter)
 304                 os << t.character();
 305         else
 306                 os << '[' << t.character() << ',' << t.cat() << ']';
 307         return os;
 308 }
 309
 310
 311 class Parser {
 312 public:
 313         ///
 314         typedef  InsetMath::mode_type mode_type;
 315
 316         ///
 317         Parser(Lexer & lex);
 318         /// Only use this for reading from .lyx file format, for the reason
 319         /// see Parser::tokenize(std::istream &).
 320         Parser(istream & is);
 321         ///
 322         Parser(docstring const & str);
 323
 324         ///
 325         bool parse(MathAtom & at);
 326         ///
 327         void parse(MathData & array, unsigned flags, mode_type mode);
 328         ///
 329         void parse1(InsetMathGrid & grid, unsigned flags, mode_type mode,
 330                 bool numbered);
 331         ///
 332         MathData parse(unsigned flags, mode_type mode);
 333         ///
 334         int lineno() const { return lineno_; }
 335         ///
 336         void putback();
 337
 338 private:
 339         ///
 340         void parse2(MathAtom & at, unsigned flags, mode_type mode, bool numbered);
 341         /// get arg delimited by 'left' and 'right'
 342         docstring getArg(char_type left, char_type right);
 343         ///
 344         char_type getChar();
 345         ///
 346         void error(string const & msg);
 347         void error(docstring const & msg) { error(to_utf8(msg)); }
 348         /// dump contents to screen
 349         void dump() const;
 350         /// Only use this for reading from .lyx file format (see
 351         /// implementation for reason)
 352         void tokenize(istream & is);
 353         ///
 354         void tokenize(docstring const & s);
 355         ///
 356         void skipSpaceTokens(idocstream & is, char_type c);
 357         ///
 358         void push_back(Token const & t);
 359         ///
 360         void pop_back();
 361         ///
 362         Token const & prevToken() const;
 363         ///
 364         Token const & nextToken() const;
 365         ///
 366         Token const & getToken();
 367         /// skips spaces if any
 368         void skipSpaces();
 369         ///
 370         void lex(docstring const & s);
 371         ///
 372         bool good() const;
 373         ///
 374         docstring parse_verbatim_item();
 375         ///
 376         docstring parse_verbatim_option();
 377
 378         ///
 379         int lineno_;
 380         ///
 381         vector<Token> tokens_;
 382         ///
 383         unsigned pos_;
 384         /// Stack of active environments
 385         vector<docstring> environments_;
 386 };
 387
 388
 389 Parser::Parser(Lexer & lexer)
 390         : lineno_(lexer.getLineNo()), pos_(0)
 391 {
 392         tokenize(lexer.getStream());
 393         lexer.eatLine();
 394 }
 395
 396
 397 Parser::Parser(istream & is)
 398         : lineno_(0), pos_(0)
 399 {
 400         tokenize(is);
 401 }
 402
 403
 404 Parser::Parser(docstring const & str)
 405         : lineno_(0), pos_(0)
 406 {
 407         tokenize(str);
 408 }
 409
 410
 411 void Parser::push_back(Token const & t)
 412 {
 413         tokens_.push_back(t);
 414 }
 415
 416
 417 void Parser::pop_back()
 418 {
 419         tokens_.pop_back();
 420 }
 421
 422
 423 Token const & Parser::prevToken() const
 424 {
 425         static const Token dummy;
 426         return pos_ > 0 ? tokens_[pos_ - 1] : dummy;
 427 }
 428
 429
 430 Token const & Parser::nextToken() const
 431 {
 432         static const Token dummy;
 433         return good() ? tokens_[pos_] : dummy;
 434 }
 435
 436
 437 Token const & Parser::getToken()
 438 {
 439         static const Token dummy;
 440         //lyxerr << "looking at token " << tokens_[pos_] << " pos: " << pos_ << endl;
 441         return good() ? tokens_[pos_++] : dummy;
 442 }
 443
 444
 445 void Parser::skipSpaces()
 446 {
 447         while (nextToken().cat() == catSpace || nextToken().cat() == catNewline)
 448                 getToken();
 449 }
 450
 451
 452 void Parser::putback()
 453 {
 454         --pos_;
 455 }
 456
 457
 458 bool Parser::good() const
 459 {
 460         return pos_ < tokens_.size();
 461 }
 462
 463
 464 char_type Parser::getChar()
 465 {
 466         if (!good())
 467                 error("The input stream is not well...");
 468         return tokens_[pos_++].character();
 469 }
 470
 471
 472 docstring Parser::getArg(char_type left, char_type right)
 473 {
 474         skipSpaces();
 475
 476         docstring result;
 477         char_type c = getChar();
 478
 479         if (c != left)
 480                 putback();
 481         else
 482                 while ((c = getChar()) != right && good())
 483                         result += c;
 484
 485         return result;
 486 }
 487
 488
 489 void Parser::skipSpaceTokens(idocstream & is, char_type c)
 490 {
 491         // skip trailing spaces
 492         while (catcode(c) == catSpace || catcode(c) == catNewline)
 493                 if (!is.get(c))
 494                         break;
 495         //lyxerr << "putting back: " << c << endl;
 496         is.putback(c);
 497 }
 498
 499
 500 void Parser::tokenize(istream & is)
 501 {
 502         // eat everything up to the next \end_inset or end of stream
 503         // and store it in s for further tokenization
 504         string s;
 505         char c;
 506         while (is.get(c)) {
 507                 s += c;
 508                 if (s.size() >= 10 && s.substr(s.size() - 10) == "\\end_inset") {
 509                         s = s.substr(0, s.size() - 10);
 510                         break;
 511                 }
 512         }
 513         // Remove the space after \end_inset
 514         if (is.get(c) && c != ' ')
 515                 is.unget();
 516
 517         // tokenize buffer
 518         tokenize(from_utf8(s));
 519 }
 520
 521
 522 void Parser::tokenize(docstring const & buffer)
 523 {
 524         idocstringstream is(buffer, ios::in | ios::binary);
 525
 526         char_type c;
 527         while (is.get(c)) {
 528                 //lyxerr << "reading c: " << c << endl;
 529
 530                 switch (catcode(c)) {
 531                         case catNewline: {
 532                                 ++lineno_;
 533                                 is.get(c);
 534                                 if (catcode(c) == catNewline)
 535                                         ; //push_back(Token("par"));
 536                                 else {
 537                                         push_back(Token('\n', catNewline));
 538                                         is.putback(c);
 539                                 }
 540                                 break;
 541                         }
 542
 543 /*
 544                         case catComment: {
 545                                 while (is.get(c) && catcode(c) != catNewline)
 546                                         ;
 547                                 ++lineno_;
 548                                 break;
 549                         }
 550 */
 551
 552                         case catEscape: {
 553                                 is.get(c);
 554                                 if (!is) {
 555                                         error("unexpected end of input");
 556                                 } else {
 557                                         docstring s(1, c);
 558                                         if (catcode(c) == catLetter) {
 559                                                 // collect letters
 560                                                 while (is.get(c) && catcode(c) == catLetter)
 561                                                         s += c;
 562                                                 skipSpaceTokens(is, c);
 563                                         }
 564                                         push_back(Token(s));
 565                                 }
 566                                 break;
 567                         }
 568
 569                         case catSuper:
 570                         case catSub: {
 571                                 push_back(Token(c, catcode(c)));
 572                                 is.get(c);
 573                                 skipSpaceTokens(is, c);
 574                                 break;
 575                         }
 576
 577                         case catIgnore: {
 578                                 lyxerr << "ignoring a char: " << int(c) << endl;
 579                                 break;
 580                         }
 581
 582                         default:
 583                                 push_back(Token(c, catcode(c)));
 584                 }
 585         }
 586
 587 #ifdef FILEDEBUG
 588         dump();
 589 #endif
 590 }
 591
 592
 593 void Parser::dump() const
 594 {
 595         lyxerr << "\nTokens: ";
 596         for (unsigned i = 0; i < tokens_.size(); ++i) {
 597                 if (i == pos_)
 598                         lyxerr << " <#> ";
 599                 lyxerr << tokens_[i];
 600         }
 601         lyxerr << " pos: " << pos_ << endl;
 602 }
 603
 604
 605 void Parser::error(string const & msg)
 606 {
 607         lyxerr << "Line ~" << lineno_ << ": Math parse error: " << msg << endl;
 608         dump();
 609         //exit(1);
 610 }
 611
 612
 613 bool Parser::parse(MathAtom & at)
 614 {
 615         skipSpaces();
 616         MathData ar;
 617         parse(ar, false, InsetMath::UNDECIDED_MODE);
 618         if (ar.size() != 1 || ar.front()->getType() == hullNone) {
 619                 lyxerr << "unusual contents found: " << ar << endl;
 620                 at = MathAtom(new InsetMathPar(ar));
 621                 //if (at->nargs() > 0)
 622                 //      at.nucleus()->cell(0) = ar;
 623                 //else
 624                 //      lyxerr << "unusual contents found: " << ar << endl;
 625                 return true;
 626         }
 627         at = ar[0];
 628         return true;
 629 }
 630
 631
 632 docstring Parser::parse_verbatim_option()
 633 {
 634         skipSpaces();
 635         docstring res;
 636         if (nextToken().character() == '[') {
 637                 Token t = getToken();
 638                 for (Token t = getToken(); t.character() != ']' && good(); t = getToken()) {
 639                         if (t.cat() == catBegin) {
 640                                 putback();
 641                                 res += '{' + parse_verbatim_item() + '}';
 642                         } else
 643                                 res += t.asString();
 644                 }
 645         }
 646         return res;
 647 }
 648
 649
 650 docstring Parser::parse_verbatim_item()
 651 {
 652         skipSpaces();
 653         docstring res;
 654         if (nextToken().cat() == catBegin) {
 655                 Token t = getToken();
 656                 for (Token t = getToken(); t.cat() != catEnd && good(); t = getToken()) {
 657                         if (t.cat() == catBegin) {
 658                                 putback();
 659                                 res += '{' + parse_verbatim_item() + '}';
 660                         }
 661                         else
 662                                 res += t.asString();
 663                 }
 664         }
 665         return res;
 666 }
 667
 668
 669 MathData Parser::parse(unsigned flags, mode_type mode)
 670 {
 671         MathData ar;
 672         parse(ar, flags, mode);
 673         return ar;
 674 }
 675
 676
 677 void Parser::parse(MathData & array, unsigned flags, mode_type mode)
 678 {
 679         InsetMathGrid grid(1, 1);
 680         parse1(grid, flags, mode, false);
 681         array = grid.cell(0);
 682 }
 683
 684
 685 void Parser::parse2(MathAtom & at, const unsigned flags, const mode_type mode,
 686         const bool numbered)
 687 {
 688         parse1(*(at.nucleus()->asGridInset()), flags, mode, numbered);
 689 }
 690
 691
 692 void Parser::parse1(InsetMathGrid & grid, unsigned flags,
 693         const mode_type mode, const bool numbered)
 694 {
 695         int limits = 0;
 696         InsetMathGrid::row_type cellrow = 0;
 697         InsetMathGrid::col_type cellcol = 0;
 698         MathData * cell = &grid.cell(grid.index(cellrow, cellcol));
 699
 700         if (grid.asHullInset())
 701                 grid.asHullInset()->numbered(cellrow, numbered);
 702
 703         //dump();
 704         //lyxerr << " flags: " << flags << endl;
 705         //lyxerr << " mode: " << mode  << endl;
 706         //lyxerr << "grid: " << grid << endl;
 707
 708         while (good()) {
 709                 Token const & t = getToken();
 710
 711 #ifdef FILEDEBUG
 712                 lyxerr << "t: " << t << " flags: " << flags << endl;
 713                 lyxerr << "mode: " << mode  << endl;
 714                 cell->dump();
 715                 lyxerr << endl;
 716 #endif
 717
 718                 if (flags & FLAG_ITEM) {
 719
 720                         if (t.cat() == catBegin) {
 721                                 // skip the brace and collect everything to the next matching
 722                                 // closing brace
 723                                 parse1(grid, FLAG_BRACE_LAST, mode, numbered);
 724                                 return;
 725                         }
 726
 727                         // handle only this single token, leave the loop if done
 728                         flags = FLAG_LEAVE;
 729                 }
 730
 731
 732                 if (flags & FLAG_BRACED) {
 733                         if (t.cat() == catSpace)
 734                                 continue;
 735
 736                         if (t.cat() != catBegin) {
 737                                 error("opening brace expected");
 738                                 return;
 739                         }
 740
 741                         // skip the brace and collect everything to the next matching
 742                         // closing brace
 743                         flags = FLAG_BRACE_LAST;
 744                 }
 745
 746
 747                 if (flags & FLAG_OPTION) {
 748                         if (t.cat() == catOther && t.character() == '[') {
 749                                 MathData ar;
 750                                 parse(ar, FLAG_BRACK_LAST, mode);
 751                                 cell->append(ar);
 752                         } else {
 753                                 // no option found, put back token and we are done
 754                                 putback();
 755                         }
 756                         return;
 757                 }
 758
 759                 //
 760                 // cat codes
 761                 //
 762                 if (t.cat() == catMath) {
 763                         if (mode != InsetMath::MATH_MODE) {
 764                                 // we are inside some text mode thingy, so opening new math is allowed
 765                                 Token const & n = getToken();
 766                                 if (n.cat() == catMath) {
 767                                         // TeX's $$...$$ syntax for displayed math
 768                                         cell->push_back(MathAtom(new InsetMathHull(hullEquation)));
 769                                         parse2(cell->back(), FLAG_SIMPLE, InsetMath::MATH_MODE, false);
 770                                         getToken(); // skip the second '$' token
 771                                 } else {
 772                                         // simple $...$  stuff
 773                                         putback();
 774                                         cell->push_back(MathAtom(new InsetMathHull(hullSimple)));
 775                                         parse2(cell->back(), FLAG_SIMPLE, InsetMath::MATH_MODE, false);
 776                                 }
 777                         }
 778
 779                         else if (flags & FLAG_SIMPLE) {
 780                                 // this is the end of the formula
 781                                 return;
 782                         }
 783
 784                         else {
 785                                 error("something strange in the parser");
 786                                 break;
 787                         }
 788                 }
 789
 790                 else if (t.cat() == catLetter)
 791                         cell->push_back(MathAtom(new InsetMathChar(t.character())));
 792
 793                 else if (t.cat() == catSpace && mode != InsetMath::MATH_MODE) {
 794                         if (cell->empty() || cell->back()->getChar() != ' ')
 795                                 cell->push_back(MathAtom(new InsetMathChar(t.character())));
 796                 }
 797
 798                 else if (t.cat() == catNewline && mode != InsetMath::MATH_MODE) {
 799                         if (cell->empty() || cell->back()->getChar() != ' ')
 800                                 cell->push_back(MathAtom(new InsetMathChar(' ')));
 801                 }
 802
 803                 else if (t.cat() == catParameter) {
 804                         Token const & n = getToken();
 805                         cell->push_back(MathAtom(new MathMacroArgument(n.character()-'0')));
 806                 }
 807
 808                 else if (t.cat() == catActive)
 809                         cell->push_back(MathAtom(new InsetMathChar(t.character())));
 810
 811                 else if (t.cat() == catBegin) {
 812                         MathData ar;
 813                         parse(ar, FLAG_BRACE_LAST, mode);
 814                         // do not create a BraceInset if they were written by LyX
 815                         // this helps to keep the annoyance of  "a choose b"  to a minimum
 816                         if (ar.size() == 1 && ar[0]->extraBraces())
 817                                 cell->append(ar);
 818                         else
 819                                 cell->push_back(MathAtom(new InsetMathBrace(ar)));
 820                 }
 821
 822                 else if (t.cat() == catEnd) {
 823                         if (flags & FLAG_BRACE_LAST)
 824                                 return;
 825                         error("found '}' unexpectedly");
 826                         //BOOST_ASSERT(false);
 827                         //add(cell, '}', LM_TC_TEX);
 828                 }
 829
 830                 else if (t.cat() == catAlign) {
 831                         //lyxerr << " column now " << (cellcol + 1)
 832                         //       << " max: " << grid.ncols() << endl;
 833                         if (flags & FLAG_ALIGN)
 834                                 return;
 835                         if (addCol(grid, cellcol))
 836                                 cell = &grid.cell(grid.index(cellrow, cellcol));
 837                 }
 838
 839                 else if (t.cat() == catSuper || t.cat() == catSub) {
 840                         bool up = (t.cat() == catSuper);
 841                         // we need no new script inset if the last thing was a scriptinset,
 842                         // which has that script already not the same script already
 843                         if (!cell->size())
 844                                 cell->push_back(MathAtom(new InsetMathScript(up)));
 845                         else if (cell->back()->asScriptInset() &&
 846                                         !cell->back()->asScriptInset()->has(up))
 847                                 cell->back().nucleus()->asScriptInset()->ensure(up);
 848                         else if (cell->back()->asScriptInset())
 849                                 cell->push_back(MathAtom(new InsetMathScript(up)));
 850                         else
 851                                 cell->back() = MathAtom(new InsetMathScript(cell->back(), up));
 852                         InsetMathScript * p = cell->back().nucleus()->asScriptInset();
 853                         // special handling of {}-bases
 854                         // Here we could remove the brace inset for things
 855                         // like {a'}^2 and add the braces back in
 856                         // InsetMathScript::write().
 857                         // We do not do it, since it is not possible to detect
 858                         // reliably whether the braces are needed because the
 859                         // nucleus contains more than one symbol, or whether
 860                         // they are needed for unknown commands like \xx{a}_0
 861                         // or \yy{a}{b}_0. This was done in revision 14819
 862                         // in an unreliable way. See this thread
 863                         // http://www.mail-archive.com/lyx-devel%40lists.lyx.org/msg104917.html
 864                         // for more details.
 865                         parse(p->cell(p->idxOfScript(up)), FLAG_ITEM, mode);
 866                         if (limits) {
 867                                 p->limits(limits);
 868                                 limits = 0;
 869                         }
 870                 }
 871
 872                 else if (t.character() == ']' && (flags & FLAG_BRACK_LAST)) {
 873                         //lyxerr << "finished reading option" << endl;
 874                         return;
 875                 }
 876
 877                 else if (t.cat() == catOther)
 878                         cell->push_back(MathAtom(new InsetMathChar(t.character())));
 879
 880                 else if (t.cat() == catComment) {
 881                         docstring s;
 882                         while (good()) {
 883                                 Token const & t = getToken();
 884                                 if (t.cat() == catNewline)
 885                                         break;
 886                                 s += t.asString();
 887                         }
 888                         cell->push_back(MathAtom(new InsetMathComment(s)));
 889                         skipSpaces();
 890                 }
 891
 892                 //
 893                 // control sequences
 894                 //
 895
 896                 else if (t.cs() == "lyxlock") {
 897                         if (cell->size())
 898                                 cell->back().nucleus()->lock(true);
 899                 }
 900
 901                 else if (t.cs() == "def" ||
 902                         t.cs() == "newcommand" ||
 903                         t.cs() == "renewcommand")
 904                 {
 905                         docstring const type = t.cs();
 906                         docstring name;
 907                         int nargs = 0;
 908                         if (t.cs() == "def") {
 909                                 // get name
 910                                 name = getToken().cs();
 911
 912                                 // read parameter
 913                                 docstring pars;
 914                                 while (good() && nextToken().cat() != catBegin) {
 915                                         pars += getToken().cs();
 916                                         ++nargs;
 917                                 }
 918                                 nargs /= 2;
 919                                 //lyxerr << "read \\def parameter list '" << pars << "'" << endl;
 920
 921                         } else { // t.cs() == "newcommand" || t.cs() == "renewcommand"
 922
 923                                 if (getToken().cat() != catBegin) {
 924                                         error("'{' in \\newcommand expected (1) ");
 925                                         return;
 926                                 }
 927
 928                                 name = getToken().cs();
 929
 930                                 if (getToken().cat() != catEnd) {
 931                                         error("'}' in \\newcommand expected");
 932                                         return;
 933                                 }
 934
 935                                 docstring const arg = getArg('[', ']');
 936                                 if (!arg.empty())
 937                                         nargs = convert<int>(arg);
 938
 939                         }
 940
 941                         MathData ar1;
 942                         parse(ar1, FLAG_ITEM, InsetMath::UNDECIDED_MODE);
 943
 944                         // we cannot handle recursive stuff at all
 945                         //MathData test;
 946                         //test.push_back(createInsetMath(name));
 947                         //if (ar1.contains(test)) {
 948                         //      error("we cannot handle recursive macros at all.");
 949                         //      return;
 950                         //}
 951
 952                         // is a version for display attached?
 953                         skipSpaces();
 954                         MathData ar2;
 955                         if (nextToken().cat() == catBegin)
 956                                 parse(ar2, FLAG_ITEM, InsetMath::MATH_MODE);
 957
 958                         cell->push_back(MathAtom(new MathMacroTemplate(name, nargs, type,
 959                                 ar1, ar2)));
 960                 }
 961
 962                 else if (t.cs() == "(") {
 963                         cell->push_back(MathAtom(new InsetMathHull(hullSimple)));
 964                         parse2(cell->back(), FLAG_SIMPLE2, InsetMath::MATH_MODE, false);
 965                 }
 966
 967                 else if (t.cs() == "[") {
 968                         cell->push_back(MathAtom(new InsetMathHull(hullEquation)));
 969                         parse2(cell->back(), FLAG_EQUATION, InsetMath::MATH_MODE, false);
 970                 }
 971
 972                 else if (t.cs() == "protect")
 973                         // ignore \\protect, will hopefully be re-added during output
 974                         ;
 975
 976                 else if (t.cs() == "end") {
 977                         if (flags & FLAG_END) {
 978                                 // eat environment name
 979                                 docstring const name = getArg('{', '}');
 980                                 if (environments_.empty())
 981                                         error("'found \\end{" + name +
 982                                               "}' without matching '\\begin{" +
 983                                               name + "}'");
 984                                 else if (name != environments_.back())
 985                                         error("'\\end{" + name +
 986                                               "}' does not match '\\begin{" +
 987                                               environments_.back() + "}'");
 988                                 else {
 989                                         environments_.pop_back();
 990                                         // Delete empty last row in matrix
 991                                         // like insets.
 992                                         // If you abuse InsetMathGrid for
 993                                         // non-matrix like structures you
 994                                         // probably need to refine this test.
 995                                         // Right now we only have to test for
 996                                         // single line hull insets.
 997                                         if (grid.nrows() > 1)
 998                                                 delEmptyLastRow(grid);
 999                                         return;
1000                                 }
1001                         } else
1002                                 error("found 'end' unexpectedly");
1003                 }
1004
1005                 else if (t.cs() == ")") {
1006                         if (flags & FLAG_SIMPLE2)
1007                                 return;
1008                         error("found '\\)' unexpectedly");
1009                 }
1010
1011                 else if (t.cs() == "]") {
1012                         if (flags & FLAG_EQUATION)
1013                                 return;
1014                         error("found '\\]' unexpectedly");
1015                 }
1016
1017                 else if (t.cs() == "\\") {
1018                         if (flags & FLAG_ALIGN)
1019                                 return;
1020                         bool added;
1021                         if (nextToken().asInput() == "*") {
1022                                 getToken();
1023                                 added = addRow(grid, cellrow, docstring(), false);
1024                         } else
1025                                 added = addRow(grid, cellrow, getArg('[', ']'));
1026                         if (added) {
1027                                 cellcol = 0;
1028                                 if (grid.asHullInset())
1029                                         grid.asHullInset()->numbered(
1030                                                         cellrow, numbered);
1031                                 cell = &grid.cell(grid.index(cellrow,
1032                                                              cellcol));
1033                         }
1034                 }
1035
1036 #if 0
1037                 else if (t.cs() == "multicolumn") {
1038                         // extract column count and insert dummy cells
1039                         MathData count;
1040                         parse(count, FLAG_ITEM, mode);
1041                         int cols = 1;
1042                         if (!extractNumber(count, cols)) {
1043                                 lyxerr << " can't extract number of cells from " << count << endl;
1044                         }
1045                         // resize the table if necessary
1046                         for (int i = 0; i < cols; ++i) {
1047                                 if (addCol(grid, cellcol)) {
1048                                         cell = &grid.cell(grid.index(
1049                                                         cellrow, cellcol));
1050                                         // mark this as dummy
1051                                         grid.cellinfo(grid.index(
1052                                                 cellrow, cellcol)).dummy_ = true;
1053                                 }
1054                         }
1055                         // the last cell is the real thing, not a dummy
1056                         grid.cellinfo(grid.index(cellrow, cellcol)).dummy_ = false;
1057
1058                         // read special alignment
1059                         MathData align;
1060                         parse(align, FLAG_ITEM, mode);
1061                         //grid.cellinfo(grid.index(cellrow, cellcol)).align_ = extractString(align);
1062
1063                         // parse the remaining contents into the "real" cell
1064                         parse(*cell, FLAG_ITEM, mode);
1065                 }
1066 #endif
1067
1068                 else if (t.cs() == "limits")
1069                         limits = 1;
1070
1071                 else if (t.cs() == "nolimits")
1072                         limits = -1;
1073
1074                 else if (t.cs() == "nonumber") {
1075                         if (grid.asHullInset())
1076                                 grid.asHullInset()->numbered(cellrow, false);
1077                 }
1078
1079                 else if (t.cs() == "number") {
1080                         if (grid.asHullInset())
1081                                 grid.asHullInset()->numbered(cellrow, true);
1082                 }
1083
1084                 else if (t.cs() == "hline") {
1085                         grid.rowinfo(cellrow).lines_ ++;
1086                 }
1087
1088                 else if (t.cs() == "sqrt") {
1089                         MathData ar;
1090                         parse(ar, FLAG_OPTION, mode);
1091                         if (ar.size()) {
1092                                 cell->push_back(MathAtom(new InsetMathRoot));
1093                                 cell->back().nucleus()->cell(0) = ar;
1094                                 parse(cell->back().nucleus()->cell(1), FLAG_ITEM, mode);
1095                         } else {
1096                                 cell->push_back(MathAtom(new InsetMathSqrt));
1097                                 parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1098                         }
1099                 }
1100
1101                 else if (t.cs() == "xrightarrow" || t.cs() == "xleftarrow") {
1102                         cell->push_back(createInsetMath(t.cs()));
1103                         parse(cell->back().nucleus()->cell(1), FLAG_OPTION, mode);
1104                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1105                 }
1106
1107                 else if (t.cs() == "ref" || t.cs() == "prettyref" ||
1108                                 t.cs() == "pageref" || t.cs() == "vpageref" || t.cs() == "vref") {
1109                         cell->push_back(MathAtom(new InsetMathRef(t.cs())));
1110                         parse(cell->back().nucleus()->cell(1), FLAG_OPTION, mode);
1111                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1112                 }
1113
1114                 else if (t.cs() == "left") {
1115                         skipSpaces();
1116                         Token const & tl = getToken();
1117                         // \| and \Vert are equivalent, and InsetMathDelim
1118                         // can't handle \|
1119                         // FIXME: fix this in InsetMathDelim itself!
1120                         docstring const l = tl.cs() == "|" ? from_ascii("Vert") : tl.asString();
1121                         MathData ar;
1122                         parse(ar, FLAG_RIGHT, mode);
1123                         if (!good())
1124                                 break;
1125                         skipSpaces();
1126                         Token const & tr = getToken();
1127                         docstring const r = tr.cs() == "|" ? from_ascii("Vert") : tr.asString();
1128                         cell->push_back(MathAtom(new InsetMathDelim(l, r, ar)));
1129                 }
1130
1131                 else if (t.cs() == "right") {
1132                         if (flags & FLAG_RIGHT)
1133                                 return;
1134                         //lyxerr << "got so far: '" << cell << "'" << endl;
1135                         error("Unmatched right delimiter");
1136                         return;
1137                 }
1138
1139                 else if (t.cs() == "begin") {
1140                         docstring const name = getArg('{', '}');
1141                         environments_.push_back(name);
1142
1143                         if (name == "array" || name == "subarray") {
1144                                 docstring const valign = parse_verbatim_option() + 'c';
1145                                 docstring const halign = parse_verbatim_item();
1146                                 cell->push_back(MathAtom(new InsetMathArray(name, (char)valign[0], halign)));
1147                                 parse2(cell->back(), FLAG_END, mode, false);
1148                         }
1149
1150                         else if (name == "tabular") {
1151                                 docstring const valign = parse_verbatim_option() + 'c';
1152                                 docstring const halign = parse_verbatim_item();
1153                                 cell->push_back(MathAtom(new InsetMathTabular(name, (char)valign[0], halign)));
1154                                 parse2(cell->back(), FLAG_END, InsetMath::TEXT_MODE, false);
1155                         }
1156
1157                         else if (name == "split" || name == "cases") {
1158                                 cell->push_back(createInsetMath(name));
1159                                 parse2(cell->back(), FLAG_END, mode, false);
1160                         }
1161
1162                         else if (name == "alignedat") {
1163                                 docstring const valign = parse_verbatim_option() + 'c';
1164                                 // ignore this for a while
1165                                 getArg('{', '}');
1166                                 cell->push_back(MathAtom(new InsetMathSplit(name, (char)valign[0])));
1167                                 parse2(cell->back(), FLAG_END, mode, false);
1168                         }
1169
1170                         else if (name == "math") {
1171                                 cell->push_back(MathAtom(new InsetMathHull(hullSimple)));
1172                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, true);
1173                         }
1174
1175                         else if (name == "equation" || name == "equation*"
1176                                         || name == "displaymath") {
1177                                 cell->push_back(MathAtom(new InsetMathHull(hullEquation)));
1178                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, (name == "equation"));
1179                         }
1180
1181                         else if (name == "eqnarray" || name == "eqnarray*") {
1182                                 cell->push_back(MathAtom(new InsetMathHull(hullEqnArray)));
1183                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1184                         }
1185
1186                         else if (name == "align" || name == "align*") {
1187                                 cell->push_back(MathAtom(new InsetMathHull(hullAlign)));
1188                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1189                         }
1190
1191                         else if (name == "flalign" || name == "flalign*") {
1192                                 cell->push_back(MathAtom(new InsetMathHull(hullFlAlign)));
1193                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1194                         }
1195
1196                         else if (name == "alignat" || name == "alignat*") {
1197                                 // ignore this for a while
1198                                 getArg('{', '}');
1199                                 cell->push_back(MathAtom(new InsetMathHull(hullAlignAt)));
1200                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1201                         }
1202
1203                         else if (name == "xalignat" || name == "xalignat*") {
1204                                 // ignore this for a while
1205                                 getArg('{', '}');
1206                                 cell->push_back(MathAtom(new InsetMathHull(hullXAlignAt)));
1207                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1208                         }
1209
1210                         else if (name == "xxalignat") {
1211                                 // ignore this for a while
1212                                 getArg('{', '}');
1213                                 cell->push_back(MathAtom(new InsetMathHull(hullXXAlignAt)));
1214                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1215                         }
1216
1217                         else if (name == "multline" || name == "multline*") {
1218                                 cell->push_back(MathAtom(new InsetMathHull(hullMultline)));
1219                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1220                         }
1221
1222                         else if (name == "gather" || name == "gather*") {
1223                                 cell->push_back(MathAtom(new InsetMathHull(hullGather)));
1224                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1225                         }
1226
1227                         else if (latexkeys const * l = in_word_set(name)) {
1228                                 if (l->inset == "matrix") {
1229                                         cell->push_back(createInsetMath(name));
1230                                         parse2(cell->back(), FLAG_END, mode, false);
1231                                 } else if (l->inset == "split") {
1232                                         docstring const valign = parse_verbatim_option() + 'c';
1233                                         cell->push_back(MathAtom(new InsetMathSplit(name, (char)valign[0])));
1234                                         parse2(cell->back(), FLAG_END, mode, false);
1235                                 } else {
1236                                         dump();
1237                                         lyxerr << "found math environment `" << to_utf8(name)
1238                                                << "' in symbols file with unsupported inset `"
1239                                                << to_utf8(l->inset) << "'." << endl;
1240                                         // create generic environment inset
1241                                         cell->push_back(MathAtom(new InsetMathEnv(name)));
1242                                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1243                                 }
1244                         }
1245
1246                         else {
1247                                 dump();
1248                                 lyxerr << "found unknown math environment '" << to_utf8(name)
1249                                         << "'" << endl;
1250                                 // create generic environment inset
1251                                 cell->push_back(MathAtom(new InsetMathEnv(name)));
1252                                 parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1253                         }
1254                 }
1255
1256                 else if (t.cs() == "kern") {
1257 #ifdef WITH_WARNINGS
1258 #warning A hack...
1259 #endif
1260                         docstring s;
1261                         while (true) {
1262                                 Token const & t = getToken();
1263                                 if (!good()) {
1264                                         putback();
1265                                         break;
1266                                 }
1267                                 s += t.character();
1268                                 if (isValidLength(to_utf8(s)))
1269                                         break;
1270                         }
1271                         cell->push_back(MathAtom(new InsetMathKern(s)));
1272                 }
1273
1274                 else if (t.cs() == "label") {
1275                         // FIXME: This is swallowed in inline formulas
1276                         docstring label = parse_verbatim_item();
1277                         MathData ar;
1278                         asArray(label, ar);
1279                         if (grid.asHullInset()) {
1280                                 grid.asHullInset()->label(cellrow, label);
1281                         } else {
1282                                 cell->push_back(createInsetMath(t.cs()));
1283                                 cell->push_back(MathAtom(new InsetMathBrace(ar)));
1284                         }
1285                 }
1286
1287                 else if (t.cs() == "choose" || t.cs() == "over" || t.cs() == "atop") {
1288                         MathAtom at = createInsetMath(t.cs());
1289                         at.nucleus()->cell(0) = *cell;
1290                         cell->clear();
1291                         parse(at.nucleus()->cell(1), flags, mode);
1292                         cell->push_back(at);
1293                         return;
1294                 }
1295
1296                 else if (t.cs() == "color") {
1297                         docstring const color = parse_verbatim_item();
1298                         cell->push_back(MathAtom(new InsetMathColor(true, color)));
1299                         parse(cell->back().nucleus()->cell(0), flags, mode);
1300                         return;
1301                 }
1302
1303                 else if (t.cs() == "textcolor") {
1304                         docstring const color = parse_verbatim_item();
1305                         cell->push_back(MathAtom(new InsetMathColor(false, color)));
1306                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, InsetMath::TEXT_MODE);
1307                 }
1308
1309                 else if (t.cs() == "normalcolor") {
1310                         cell->push_back(createInsetMath(t.cs()));
1311                         parse(cell->back().nucleus()->cell(0), flags, mode);
1312                         return;
1313                 }
1314
1315                 else if (t.cs() == "substack") {
1316                         cell->push_back(createInsetMath(t.cs()));
1317                         parse2(cell->back(), FLAG_ITEM, mode, false);
1318                 }
1319
1320                 else if (t.cs() == "xymatrix") {
1321                         odocstringstream os;
1322                         while (good() && nextToken().cat() != catBegin)
1323                                 os << getToken().asInput();
1324                         cell->push_back(createInsetMath(t.cs() + os.str()));
1325                         parse2(cell->back(), FLAG_ITEM, mode, false);
1326                 }
1327
1328                 else if (t.cs() == "framebox" || t.cs() == "makebox") {
1329                         cell->push_back(createInsetMath(t.cs()));
1330                         parse(cell->back().nucleus()->cell(0), FLAG_OPTION, InsetMath::TEXT_MODE);
1331                         parse(cell->back().nucleus()->cell(1), FLAG_OPTION, InsetMath::TEXT_MODE);
1332                         parse(cell->back().nucleus()->cell(2), FLAG_ITEM, InsetMath::TEXT_MODE);
1333                 }
1334
1335                 else if (t.cs() == "tag") {
1336                         if (nextToken().character() == '*') {
1337                                 getToken();
1338                                 cell->push_back(createInsetMath(t.cs() + '*'));
1339                         } else
1340                                 cell->push_back(createInsetMath(t.cs()));
1341                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, InsetMath::TEXT_MODE);
1342                 }
1343
1344 #if 0
1345                 else if (t.cs() == "infer") {
1346                         MathData ar;
1347                         parse(ar, FLAG_OPTION, mode);
1348                         cell->push_back(createInsetMath(t.cs()));
1349                         parse2(cell->back(), FLAG_ITEM, mode, false);
1350                 }
1351
1352                 // Disabled
1353                 else if (1 && t.cs() == "ar") {
1354                         auto_ptr<InsetMathXYArrow> p(new InsetMathXYArrow);
1355                         // try to read target
1356                         parse(p->cell(0), FLAG_OTPTION, mode);
1357                         // try to read label
1358                         if (nextToken().cat() == catSuper || nextToken().cat() == catSub) {
1359                                 p->up_ = nextToken().cat() == catSuper;
1360                                 getToken();
1361                                 parse(p->cell(1), FLAG_ITEM, mode);
1362                                 //lyxerr << "read label: " << p->cell(1) << endl;
1363                         }
1364
1365                         cell->push_back(MathAtom(p.release()));
1366                         //lyxerr << "read cell: " << cell << endl;
1367                 }
1368 #endif
1369
1370                 else if (t.cs().size()) {
1371                         latexkeys const * l = in_word_set(t.cs());
1372                         if (l) {
1373                                 if (l->inset == "big") {
1374                                         skipSpaces();
1375                                         docstring const delim = getToken().asInput();
1376                                         if (InsetMathBig::isBigInsetDelim(delim))
1377                                                 cell->push_back(MathAtom(
1378                                                         new InsetMathBig(t.cs(), delim)));
1379                                         else {
1380                                                 cell->push_back(createInsetMath(t.cs()));
1381                                                 putback();
1382                                         }
1383                                 }
1384
1385                                 else if (l->inset == "font") {
1386                                         cell->push_back(createInsetMath(t.cs()));
1387                                         parse(cell->back().nucleus()->cell(0),
1388                                                 FLAG_ITEM, asMode(mode, l->extra));
1389                                 }
1390
1391                                 else if (l->inset == "oldfont") {
1392                                         cell->push_back(createInsetMath(t.cs()));
1393                                         parse(cell->back().nucleus()->cell(0),
1394                                                 flags | FLAG_ALIGN, asMode(mode, l->extra));
1395                                         if (prevToken().cat() != catAlign &&
1396                                             prevToken().cs() != "\\")
1397                                                 return;
1398                                         putback();
1399                                 }
1400
1401                                 else if (l->inset == "style") {
1402                                         cell->push_back(createInsetMath(t.cs()));
1403                                         parse(cell->back().nucleus()->cell(0),
1404                                                 flags | FLAG_ALIGN, mode);
1405                                         if (prevToken().cat() != catAlign &&
1406                                             prevToken().cs() != "\\")
1407                                                 return;
1408                                         putback();
1409                                 }
1410
1411                                 else {
1412                                         MathAtom at = createInsetMath(t.cs());
1413                                         for (InsetMath::idx_type i = 0; i < at->nargs(); ++i)
1414                                                 parse(at.nucleus()->cell(i),
1415                                                         FLAG_ITEM, asMode(mode, l->extra));
1416                                         cell->push_back(at);
1417                                 }
1418                         }
1419
1420                         else {
1421                                 MathAtom at = createInsetMath(t.cs());
1422                                 InsetMath::mode_type m = mode;
1423                                 //if (m == InsetMath::UNDECIDED_MODE)
1424                                 //lyxerr << "default creation: m1: " << m << endl;
1425                                 if (at->currentMode() != InsetMath::UNDECIDED_MODE)
1426                                         m = at->currentMode();
1427                                 //lyxerr << "default creation: m2: " << m << endl;
1428                                 InsetMath::idx_type start = 0;
1429                                 // this fails on \bigg[...\bigg]
1430                                 //MathData opt;
1431                                 //parse(opt, FLAG_OPTION, InsetMath::VERBATIM_MODE);
1432                                 //if (opt.size()) {
1433                                 //      start = 1;
1434                                 //      at.nucleus()->cell(0) = opt;
1435                                 //}
1436                                 for (InsetMath::idx_type i = start; i < at->nargs(); ++i) {
1437                                         parse(at.nucleus()->cell(i), FLAG_ITEM, m);
1438                                         skipSpaces();
1439                                 }
1440                                 cell->push_back(at);
1441                         }
1442                 }
1443
1444
1445                 if (flags & FLAG_LEAVE) {
1446                         flags &= ~FLAG_LEAVE;
1447                         break;
1448                 }
1449         }
1450 }
1451
1452
1453
1454 } // anonymous namespace
1455
1456
1457 void mathed_parse_cell(MathData & ar, docstring const & str)
1458 {
1459         Parser(str).parse(ar, 0, InsetMath::MATH_MODE);
1460 }
1461
1462
1463 void mathed_parse_cell(MathData & ar, istream & is)
1464 {
1465         Parser(is).parse(ar, 0, InsetMath::MATH_MODE);
1466 }
1467
1468
1469 bool mathed_parse_normal(MathAtom & t, docstring const & str)
1470 {
1471         return Parser(str).parse(t);
1472 }
1473
1474
1475 bool mathed_parse_normal(MathAtom & t, Lexer & lex)
1476 {
1477         return Parser(lex).parse(t);
1478 }
1479
1480
1481 void mathed_parse_normal(InsetMathGrid & grid, docstring const & str)
1482 {
1483         Parser(str).parse1(grid, 0, InsetMath::MATH_MODE, false);
1484 }
1485
1486
1487 void initParser()
1488 {
1489         fill(theCatcode, theCatcode + 128, catOther);
1490         fill(theCatcode + 'a', theCatcode + 'z' + 1, catLetter);
1491         fill(theCatcode + 'A', theCatcode + 'Z' + 1, catLetter);
1492
1493         theCatcode[int('\\')] = catEscape;
1494         theCatcode[int('{')]  = catBegin;
1495         theCatcode[int('}')]  = catEnd;
1496         theCatcode[int('$')]  = catMath;
1497         theCatcode[int('&')]  = catAlign;
1498         theCatcode[int('\n')] = catNewline;
1499         theCatcode[int('#')]  = catParameter;
1500         theCatcode[int('^')]  = catSuper;
1501         theCatcode[int('_')]  = catSub;
1502         theCatcode[int(0x7f)] = catIgnore;
1503         theCatcode[int(' ')]  = catSpace;
1504         theCatcode[int('\t')] = catSpace;
1505         theCatcode[int('\r')] = catNewline;
1506         theCatcode[int('~')]  = catActive;
1507         theCatcode[int('%')]  = catComment;
1508 }
1509
1510
1511 } // namespace lyx