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 "InsetMathChar.h"
  46 #include "InsetMathColor.h"
  47 #include "InsetMathComment.h"
  48 #include "InsetMathDelim.h"
  49 #include "InsetMathEnv.h"
  50 #include "InsetMathFrac.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.appendRow(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);
 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                 putback();
 469                 return 0;
 470         }
 471         return tokens_[pos_++].character();
 472 }
 473
 474
 475 docstring Parser::getArg(char_type left, char_type right)
 476 {
 477         skipSpaces();
 478
 479         docstring result;
 480         char_type c = getChar();
 481
 482         if (c != left)
 483                 putback();
 484         else
 485                 while ((c = getChar()) != right && good())
 486                         result += c;
 487
 488         return result;
 489 }
 490
 491
 492 void Parser::skipSpaceTokens(idocstream & is, char_type c)
 493 {
 494         // skip trailing spaces
 495         while (catcode(c) == catSpace || catcode(c) == catNewline)
 496                 if (!is.get(c))
 497                         break;
 498         //lyxerr << "putting back: " << c << endl;
 499         is.putback(c);
 500 }
 501
 502
 503 void Parser::tokenize(istream & is)
 504 {
 505         // eat everything up to the next \end_inset or end of stream
 506         // and store it in s for further tokenization
 507         string s;
 508         char c;
 509         while (is.get(c)) {
 510                 s += c;
 511                 if (s.size() >= 10 && s.substr(s.size() - 10) == "\\end_inset") {
 512                         s = s.substr(0, s.size() - 10);
 513                         break;
 514                 }
 515         }
 516         // Remove the space after \end_inset
 517         if (is.get(c) && c != ' ')
 518                 is.unget();
 519
 520         // tokenize buffer
 521         tokenize(from_utf8(s));
 522 }
 523
 524
 525 void Parser::tokenize(docstring const & buffer)
 526 {
 527         idocstringstream is(buffer, ios::in | ios::binary);
 528
 529         char_type c;
 530         while (is.get(c)) {
 531                 //lyxerr << "reading c: " << c << endl;
 532
 533                 switch (catcode(c)) {
 534                         case catNewline: {
 535                                 ++lineno_;
 536                                 is.get(c);
 537                                 if (catcode(c) == catNewline)
 538                                         ; //push_back(Token("par"));
 539                                 else {
 540                                         push_back(Token('\n', catNewline));
 541                                         is.putback(c);
 542                                 }
 543                                 break;
 544                         }
 545
 546 /*
 547                         case catComment: {
 548                                 while (is.get(c) && catcode(c) != catNewline)
 549                                         ;
 550                                 ++lineno_;
 551                                 break;
 552                         }
 553 */
 554
 555                         case catEscape: {
 556                                 is.get(c);
 557                                 if (!is) {
 558                                         error("unexpected end of input");
 559                                 } else {
 560                                         docstring s(1, c);
 561                                         if (catcode(c) == catLetter) {
 562                                                 // collect letters
 563                                                 while (is.get(c) && catcode(c) == catLetter)
 564                                                         s += c;
 565                                                 skipSpaceTokens(is, c);
 566                                         }
 567                                         push_back(Token(s));
 568                                 }
 569                                 break;
 570                         }
 571
 572                         case catSuper:
 573                         case catSub: {
 574                                 push_back(Token(c, catcode(c)));
 575                                 is.get(c);
 576                                 skipSpaceTokens(is, c);
 577                                 break;
 578                         }
 579
 580                         case catIgnore: {
 581                                 lyxerr << "ignoring a char: " << int(c) << endl;
 582                                 break;
 583                         }
 584
 585                         default:
 586                                 push_back(Token(c, catcode(c)));
 587                 }
 588         }
 589
 590 #ifdef FILEDEBUG
 591         dump();
 592 #endif
 593 }
 594
 595
 596 void Parser::dump() const
 597 {
 598         lyxerr << "\nTokens: ";
 599         for (unsigned i = 0; i < tokens_.size(); ++i) {
 600                 if (i == pos_)
 601                         lyxerr << " <#> ";
 602                 lyxerr << tokens_[i];
 603         }
 604         lyxerr << " pos: " << pos_ << endl;
 605 }
 606
 607
 608 void Parser::error(string const & msg)
 609 {
 610         lyxerr << "Line ~" << lineno_ << ": Math parse error: " << msg << endl;
 611         dump();
 612         //exit(1);
 613 }
 614
 615
 616 bool Parser::parse(MathAtom & at)
 617 {
 618         skipSpaces();
 619         MathData ar;
 620         parse(ar, false, InsetMath::UNDECIDED_MODE);
 621         if (ar.size() != 1 || ar.front()->getType() == hullNone) {
 622                 lyxerr << "unusual contents found: " << ar << endl;
 623                 at = MathAtom(new InsetMathPar(ar));
 624                 //if (at->nargs() > 0)
 625                 //      at.nucleus()->cell(0) = ar;
 626                 //else
 627                 //      lyxerr << "unusual contents found: " << ar << endl;
 628                 return true;
 629         }
 630         at = ar[0];
 631         return true;
 632 }
 633
 634
 635 docstring Parser::parse_verbatim_option()
 636 {
 637         skipSpaces();
 638         docstring res;
 639         if (nextToken().character() == '[') {
 640                 Token t = getToken();
 641                 for (Token t = getToken(); t.character() != ']' && good(); t = getToken()) {
 642                         if (t.cat() == catBegin) {
 643                                 putback();
 644                                 res += '{' + parse_verbatim_item() + '}';
 645                         } else
 646                                 res += t.asString();
 647                 }
 648         }
 649         return res;
 650 }
 651
 652
 653 docstring Parser::parse_verbatim_item()
 654 {
 655         skipSpaces();
 656         docstring res;
 657         if (nextToken().cat() == catBegin) {
 658                 Token t = getToken();
 659                 for (Token t = getToken(); t.cat() != catEnd && good(); t = getToken()) {
 660                         if (t.cat() == catBegin) {
 661                                 putback();
 662                                 res += '{' + parse_verbatim_item() + '}';
 663                         }
 664                         else
 665                                 res += t.asString();
 666                 }
 667         }
 668         return res;
 669 }
 670
 671
 672 MathData Parser::parse(unsigned flags, mode_type mode)
 673 {
 674         MathData ar;
 675         parse(ar, flags, mode);
 676         return ar;
 677 }
 678
 679
 680 void Parser::parse(MathData & array, unsigned flags, mode_type mode)
 681 {
 682         InsetMathGrid grid(1, 1);
 683         parse1(grid, flags, mode, false);
 684         array = grid.cell(0);
 685 }
 686
 687
 688 void Parser::parse2(MathAtom & at, const unsigned flags, const mode_type mode,
 689         const bool numbered)
 690 {
 691         parse1(*(at.nucleus()->asGridInset()), flags, mode, numbered);
 692 }
 693
 694
 695 void Parser::parse1(InsetMathGrid & grid, unsigned flags,
 696         const mode_type mode, const bool numbered)
 697 {
 698         int limits = 0;
 699         InsetMathGrid::row_type cellrow = 0;
 700         InsetMathGrid::col_type cellcol = 0;
 701         MathData * cell = &grid.cell(grid.index(cellrow, cellcol));
 702
 703         if (grid.asHullInset())
 704                 grid.asHullInset()->numbered(cellrow, numbered);
 705
 706         //dump();
 707         //lyxerr << " flags: " << flags << endl;
 708         //lyxerr << " mode: " << mode  << endl;
 709         //lyxerr << "grid: " << grid << endl;
 710
 711         while (good()) {
 712                 Token const & t = getToken();
 713
 714 #ifdef FILEDEBUG
 715                 lyxerr << "t: " << t << " flags: " << flags << endl;
 716                 lyxerr << "mode: " << mode  << endl;
 717                 cell->dump();
 718                 lyxerr << endl;
 719 #endif
 720
 721                 if (flags & FLAG_ITEM) {
 722
 723                         if (t.cat() == catBegin) {
 724                                 // skip the brace and collect everything to the next matching
 725                                 // closing brace
 726                                 parse1(grid, FLAG_BRACE_LAST, mode, numbered);
 727                                 return;
 728                         }
 729
 730                         // handle only this single token, leave the loop if done
 731                         flags = FLAG_LEAVE;
 732                 }
 733
 734
 735                 if (flags & FLAG_BRACED) {
 736                         if (t.cat() == catSpace)
 737                                 continue;
 738
 739                         if (t.cat() != catBegin) {
 740                                 error("opening brace expected");
 741                                 return;
 742                         }
 743
 744                         // skip the brace and collect everything to the next matching
 745                         // closing brace
 746                         flags = FLAG_BRACE_LAST;
 747                 }
 748
 749
 750                 if (flags & FLAG_OPTION) {
 751                         if (t.cat() == catOther && t.character() == '[') {
 752                                 MathData ar;
 753                                 parse(ar, FLAG_BRACK_LAST, mode);
 754                                 cell->append(ar);
 755                         } else {
 756                                 // no option found, put back token and we are done
 757                                 putback();
 758                         }
 759                         return;
 760                 }
 761
 762                 //
 763                 // cat codes
 764                 //
 765                 if (t.cat() == catMath) {
 766                         if (mode != InsetMath::MATH_MODE) {
 767                                 // we are inside some text mode thingy, so opening new math is allowed
 768                                 Token const & n = getToken();
 769                                 if (n.cat() == catMath) {
 770                                         // TeX's $$...$$ syntax for displayed math
 771                                         cell->push_back(MathAtom(new InsetMathHull(hullEquation)));
 772                                         parse2(cell->back(), FLAG_SIMPLE, InsetMath::MATH_MODE, false);
 773                                         getToken(); // skip the second '$' token
 774                                 } else {
 775                                         // simple $...$  stuff
 776                                         putback();
 777                                         cell->push_back(MathAtom(new InsetMathHull(hullSimple)));
 778                                         parse2(cell->back(), FLAG_SIMPLE, InsetMath::MATH_MODE, false);
 779                                 }
 780                         }
 781
 782                         else if (flags & FLAG_SIMPLE) {
 783                                 // this is the end of the formula
 784                                 return;
 785                         }
 786
 787                         else {
 788                                 error("something strange in the parser");
 789                                 break;
 790                         }
 791                 }
 792
 793                 else if (t.cat() == catLetter)
 794                         cell->push_back(MathAtom(new InsetMathChar(t.character())));
 795
 796                 else if (t.cat() == catSpace && mode != InsetMath::MATH_MODE) {
 797                         if (cell->empty() || cell->back()->getChar() != ' ')
 798                                 cell->push_back(MathAtom(new InsetMathChar(t.character())));
 799                 }
 800
 801                 else if (t.cat() == catNewline && mode != InsetMath::MATH_MODE) {
 802                         if (cell->empty() || cell->back()->getChar() != ' ')
 803                                 cell->push_back(MathAtom(new InsetMathChar(' ')));
 804                 }
 805
 806                 else if (t.cat() == catParameter) {
 807                         Token const & n = getToken();
 808                         cell->push_back(MathAtom(new MathMacroArgument(n.character()-'0')));
 809                 }
 810
 811                 else if (t.cat() == catActive)
 812                         cell->push_back(MathAtom(new InsetMathChar(t.character())));
 813
 814                 else if (t.cat() == catBegin) {
 815                         MathData ar;
 816                         parse(ar, FLAG_BRACE_LAST, mode);
 817                         // do not create a BraceInset if they were written by LyX
 818                         // this helps to keep the annoyance of  "a choose b"  to a minimum
 819                         if (ar.size() == 1 && ar[0]->extraBraces())
 820                                 cell->append(ar);
 821                         else
 822                                 cell->push_back(MathAtom(new InsetMathBrace(ar)));
 823                 }
 824
 825                 else if (t.cat() == catEnd) {
 826                         if (flags & FLAG_BRACE_LAST)
 827                                 return;
 828                         error("found '}' unexpectedly");
 829                         //BOOST_ASSERT(false);
 830                         //add(cell, '}', LM_TC_TEX);
 831                 }
 832
 833                 else if (t.cat() == catAlign) {
 834                         //lyxerr << " column now " << (cellcol + 1)
 835                         //       << " max: " << grid.ncols() << endl;
 836                         if (flags & FLAG_ALIGN)
 837                                 return;
 838                         if (addCol(grid, cellcol))
 839                                 cell = &grid.cell(grid.index(cellrow, cellcol));
 840                 }
 841
 842                 else if (t.cat() == catSuper || t.cat() == catSub) {
 843                         bool up = (t.cat() == catSuper);
 844                         // we need no new script inset if the last thing was a scriptinset,
 845                         // which has that script already not the same script already
 846                         if (!cell->size())
 847                                 cell->push_back(MathAtom(new InsetMathScript(up)));
 848                         else if (cell->back()->asScriptInset() &&
 849                                         !cell->back()->asScriptInset()->has(up))
 850                                 cell->back().nucleus()->asScriptInset()->ensure(up);
 851                         else if (cell->back()->asScriptInset())
 852                                 cell->push_back(MathAtom(new InsetMathScript(up)));
 853                         else
 854                                 cell->back() = MathAtom(new InsetMathScript(cell->back(), up));
 855                         InsetMathScript * p = cell->back().nucleus()->asScriptInset();
 856                         // special handling of {}-bases
 857                         // Here we could remove the brace inset for things
 858                         // like {a'}^2 and add the braces back in
 859                         // InsetMathScript::write().
 860                         // We do not do it, since it is not possible to detect
 861                         // reliably whether the braces are needed because the
 862                         // nucleus contains more than one symbol, or whether
 863                         // they are needed for unknown commands like \xx{a}_0
 864                         // or \yy{a}{b}_0. This was done in revision 14819
 865                         // in an unreliable way. See this thread
 866                         // http://www.mail-archive.com/lyx-devel%40lists.lyx.org/msg104917.html
 867                         // for more details.
 868                         parse(p->cell(p->idxOfScript(up)), FLAG_ITEM, mode);
 869                         if (limits) {
 870                                 p->limits(limits);
 871                                 limits = 0;
 872                         }
 873                 }
 874
 875                 else if (t.character() == ']' && (flags & FLAG_BRACK_LAST)) {
 876                         //lyxerr << "finished reading option" << endl;
 877                         return;
 878                 }
 879
 880                 else if (t.cat() == catOther)
 881                         cell->push_back(MathAtom(new InsetMathChar(t.character())));
 882
 883                 else if (t.cat() == catComment) {
 884                         docstring s;
 885                         while (good()) {
 886                                 Token const & t = getToken();
 887                                 if (t.cat() == catNewline)
 888                                         break;
 889                                 s += t.asString();
 890                         }
 891                         cell->push_back(MathAtom(new InsetMathComment(s)));
 892                         skipSpaces();
 893                 }
 894
 895                 //
 896                 // control sequences
 897                 //
 898
 899                 else if (t.cs() == "lyxlock") {
 900                         if (cell->size())
 901                                 cell->back().nucleus()->lock(true);
 902                 }
 903
 904                 else if (t.cs() == "def" ||
 905                         t.cs() == "newcommand" ||
 906                         t.cs() == "renewcommand")
 907                 {
 908                         docstring const type = t.cs();
 909                         docstring name;
 910                         int nargs = 0;
 911                         int optionals = 0;
 912                         std::vector<MathData> optionalValues;
 913                         if (t.cs() == "def") {
 914                                 // get name
 915                                 name = getToken().cs();
 916
 917                                 // read parameter
 918                                 docstring pars;
 919                                 while (good() && nextToken().cat() != catBegin) {
 920                                         pars += getToken().cs();
 921                                         ++nargs;
 922                                 }
 923                                 nargs /= 2;
 924                                 //lyxerr << "read \\def parameter list '" << pars << "'" << endl;
 925
 926                         } else { // t.cs() == "newcommand" || t.cs() == "renewcommand"
 927                                 if (getToken().cat() != catBegin) {
 928                                         error("'{' in \\newcommand expected (1) ");
 929                                         return;
 930                                 }
 931
 932                                 name = getToken().cs();
 933
 934                                 if (getToken().cat() != catEnd) {
 935                                         error("'}' in \\newcommand expected");
 936                                         return;
 937                                 }
 938
 939                                 docstring const arg = getArg('[', ']');
 940                                 if (!arg.empty())
 941                                         nargs = convert<int>(arg);
 942
 943                                 // optional argument given?
 944                                 skipSpaces();
 945                                 while (nextToken().character() == '[') {
 946                                         getToken();
 947                                         optionalValues.push_back(MathData());
 948                                         parse(optionalValues[optionals], FLAG_BRACK_LAST, mode);
 949                                         ++optionals;
 950                                 }
 951                         }
 952
 953                         MathData def;
 954                         parse(def, FLAG_ITEM, InsetMath::UNDECIDED_MODE);
 955
 956                         // is a version for display attached?
 957                         skipSpaces();
 958                         MathData display;
 959                         if (nextToken().cat() == catBegin)
 960                                 parse(display, FLAG_ITEM, InsetMath::MATH_MODE);
 961
 962                         cell->push_back(MathAtom(new MathMacroTemplate(name, nargs, optionals, type,
 963                                                                                                                                                                                                                  optionalValues, def, display)));
 964                 }
 965
 966                 else if (t.cs() == "(") {
 967                         cell->push_back(MathAtom(new InsetMathHull(hullSimple)));
 968                         parse2(cell->back(), FLAG_SIMPLE2, InsetMath::MATH_MODE, false);
 969                 }
 970
 971                 else if (t.cs() == "[") {
 972                         cell->push_back(MathAtom(new InsetMathHull(hullEquation)));
 973                         parse2(cell->back(), FLAG_EQUATION, InsetMath::MATH_MODE, false);
 974                 }
 975
 976                 else if (t.cs() == "protect")
 977                         // ignore \\protect, will hopefully be re-added during output
 978                         ;
 979
 980                 else if (t.cs() == "end") {
 981                         if (flags & FLAG_END) {
 982                                 // eat environment name
 983                                 docstring const name = getArg('{', '}');
 984                                 if (environments_.empty())
 985                                         error("'found \\end{" + name +
 986                                               "}' without matching '\\begin{" +
 987                                               name + "}'");
 988                                 else if (name != environments_.back())
 989                                         error("'\\end{" + name +
 990                                               "}' does not match '\\begin{" +
 991                                               environments_.back() + "}'");
 992                                 else {
 993                                         environments_.pop_back();
 994                                         // Delete empty last row in matrix
 995                                         // like insets.
 996                                         // If you abuse InsetMathGrid for
 997                                         // non-matrix like structures you
 998                                         // probably need to refine this test.
 999                                         // Right now we only have to test for
1000                                         // single line hull insets.
1001                                         if (grid.nrows() > 1)
1002                                                 delEmptyLastRow(grid);
1003                                         return;
1004                                 }
1005                         } else
1006                                 error("found 'end' unexpectedly");
1007                 }
1008
1009                 else if (t.cs() == ")") {
1010                         if (flags & FLAG_SIMPLE2)
1011                                 return;
1012                         error("found '\\)' unexpectedly");
1013                 }
1014
1015                 else if (t.cs() == "]") {
1016                         if (flags & FLAG_EQUATION)
1017                                 return;
1018                         error("found '\\]' unexpectedly");
1019                 }
1020
1021                 else if (t.cs() == "\\") {
1022                         if (flags & FLAG_ALIGN)
1023                                 return;
1024                         bool added;
1025                         if (nextToken().asInput() == "*") {
1026                                 getToken();
1027                                 added = addRow(grid, cellrow, docstring(), false);
1028                         } else
1029                                 added = addRow(grid, cellrow, getArg('[', ']'));
1030                         if (added) {
1031                                 cellcol = 0;
1032                                 if (grid.asHullInset())
1033                                         grid.asHullInset()->numbered(
1034                                                         cellrow, numbered);
1035                                 cell = &grid.cell(grid.index(cellrow,
1036                                                              cellcol));
1037                         }
1038                 }
1039
1040 #if 0
1041                 else if (t.cs() == "multicolumn") {
1042                         // extract column count and insert dummy cells
1043                         MathData count;
1044                         parse(count, FLAG_ITEM, mode);
1045                         int cols = 1;
1046                         if (!extractNumber(count, cols)) {
1047                                 lyxerr << " can't extract number of cells from " << count << endl;
1048                         }
1049                         // resize the table if necessary
1050                         for (int i = 0; i < cols; ++i) {
1051                                 if (addCol(grid, cellcol)) {
1052                                         cell = &grid.cell(grid.index(
1053                                                         cellrow, cellcol));
1054                                         // mark this as dummy
1055                                         grid.cellinfo(grid.index(
1056                                                 cellrow, cellcol)).dummy_ = true;
1057                                 }
1058                         }
1059                         // the last cell is the real thing, not a dummy
1060                         grid.cellinfo(grid.index(cellrow, cellcol)).dummy_ = false;
1061
1062                         // read special alignment
1063                         MathData align;
1064                         parse(align, FLAG_ITEM, mode);
1065                         //grid.cellinfo(grid.index(cellrow, cellcol)).align_ = extractString(align);
1066
1067                         // parse the remaining contents into the "real" cell
1068                         parse(*cell, FLAG_ITEM, mode);
1069                 }
1070 #endif
1071
1072                 else if (t.cs() == "limits")
1073                         limits = 1;
1074
1075                 else if (t.cs() == "nolimits")
1076                         limits = -1;
1077
1078                 else if (t.cs() == "nonumber") {
1079                         if (grid.asHullInset())
1080                                 grid.asHullInset()->numbered(cellrow, false);
1081                 }
1082
1083                 else if (t.cs() == "number") {
1084                         if (grid.asHullInset())
1085                                 grid.asHullInset()->numbered(cellrow, true);
1086                 }
1087
1088                 else if (t.cs() == "hline") {
1089                         grid.rowinfo(cellrow).lines_ ++;
1090                 }
1091
1092                 else if (t.cs() == "sqrt") {
1093                         MathData ar;
1094                         parse(ar, FLAG_OPTION, mode);
1095                         if (ar.size()) {
1096                                 cell->push_back(MathAtom(new InsetMathRoot));
1097                                 cell->back().nucleus()->cell(0) = ar;
1098                                 parse(cell->back().nucleus()->cell(1), FLAG_ITEM, mode);
1099                         } else {
1100                                 cell->push_back(MathAtom(new InsetMathSqrt));
1101                                 parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1102                         }
1103                 }
1104
1105                 else if (t.cs() == "unit") {
1106                         // Allowed formats \unit[val]{unit}
1107                         MathData ar;
1108                         parse(ar, FLAG_OPTION, mode);
1109                         if (ar.size()) {
1110                                 cell->push_back(MathAtom(new InsetMathFrac(InsetMathFrac::UNIT)));
1111                                 cell->back().nucleus()->cell(0) = ar;
1112                                 parse(cell->back().nucleus()->cell(1), FLAG_ITEM, mode);
1113                         } else {
1114                                 cell->push_back(MathAtom(new InsetMathFrac(InsetMathFrac::UNIT, 1)));
1115                                 parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1116                         }
1117                 }
1118                 else if (t.cs() == "unitfrac") {
1119                         // Here allowed formats are \unitfrac[val]{num}{denom}
1120                         MathData ar;
1121                         parse(ar, FLAG_OPTION, mode);
1122                         if (ar.size()) {
1123                                 cell->push_back(MathAtom(new InsetMathFrac(InsetMathFrac::UNITFRAC, 3)));
1124                                 cell->back().nucleus()->cell(2) = ar;
1125                         } else {
1126                                 cell->push_back(MathAtom(new InsetMathFrac(InsetMathFrac::UNITFRAC)));
1127                         }
1128                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1129                         parse(cell->back().nucleus()->cell(1), FLAG_ITEM, mode);
1130                 }
1131
1132                 else if (t.cs() == "xrightarrow" || t.cs() == "xleftarrow") {
1133                         cell->push_back(createInsetMath(t.cs()));
1134                         parse(cell->back().nucleus()->cell(1), FLAG_OPTION, mode);
1135                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1136                 }
1137
1138                 else if (t.cs() == "ref" || t.cs() == "prettyref" ||
1139                                 t.cs() == "pageref" || t.cs() == "vpageref" || t.cs() == "vref") {
1140                         cell->push_back(MathAtom(new InsetMathRef(t.cs())));
1141                         parse(cell->back().nucleus()->cell(1), FLAG_OPTION, mode);
1142                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1143                 }
1144
1145                 else if (t.cs() == "left") {
1146                         skipSpaces();
1147                         Token const & tl = getToken();
1148                         // \| and \Vert are equivalent, and InsetMathDelim
1149                         // can't handle \|
1150                         // FIXME: fix this in InsetMathDelim itself!
1151                         docstring const l = tl.cs() == "|" ? from_ascii("Vert") : tl.asString();
1152                         MathData ar;
1153                         parse(ar, FLAG_RIGHT, mode);
1154                         if (!good())
1155                                 break;
1156                         skipSpaces();
1157                         Token const & tr = getToken();
1158                         docstring const r = tr.cs() == "|" ? from_ascii("Vert") : tr.asString();
1159                         cell->push_back(MathAtom(new InsetMathDelim(l, r, ar)));
1160                 }
1161
1162                 else if (t.cs() == "right") {
1163                         if (flags & FLAG_RIGHT)
1164                                 return;
1165                         //lyxerr << "got so far: '" << cell << "'" << endl;
1166                         error("Unmatched right delimiter");
1167                         return;
1168                 }
1169
1170                 else if (t.cs() == "begin") {
1171                         docstring const name = getArg('{', '}');
1172                         environments_.push_back(name);
1173
1174                         if (name == "array" || name == "subarray") {
1175                                 docstring const valign = parse_verbatim_option() + 'c';
1176                                 docstring const halign = parse_verbatim_item();
1177                                 cell->push_back(MathAtom(new InsetMathArray(name, (char)valign[0], halign)));
1178                                 parse2(cell->back(), FLAG_END, mode, false);
1179                         }
1180
1181                         else if (name == "tabular") {
1182                                 docstring const valign = parse_verbatim_option() + 'c';
1183                                 docstring const halign = parse_verbatim_item();
1184                                 cell->push_back(MathAtom(new InsetMathTabular(name, (char)valign[0], halign)));
1185                                 parse2(cell->back(), FLAG_END, InsetMath::TEXT_MODE, false);
1186                         }
1187
1188                         else if (name == "split" || name == "cases") {
1189                                 cell->push_back(createInsetMath(name));
1190                                 parse2(cell->back(), FLAG_END, mode, false);
1191                         }
1192
1193                         else if (name == "alignedat") {
1194                                 docstring const valign = parse_verbatim_option() + 'c';
1195                                 // ignore this for a while
1196                                 getArg('{', '}');
1197                                 cell->push_back(MathAtom(new InsetMathSplit(name, (char)valign[0])));
1198                                 parse2(cell->back(), FLAG_END, mode, false);
1199                         }
1200
1201                         else if (name == "math") {
1202                                 cell->push_back(MathAtom(new InsetMathHull(hullSimple)));
1203                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, true);
1204                         }
1205
1206                         else if (name == "equation" || name == "equation*"
1207                                         || name == "displaymath") {
1208                                 cell->push_back(MathAtom(new InsetMathHull(hullEquation)));
1209                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, (name == "equation"));
1210                         }
1211
1212                         else if (name == "eqnarray" || name == "eqnarray*") {
1213                                 cell->push_back(MathAtom(new InsetMathHull(hullEqnArray)));
1214                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1215                         }
1216
1217                         else if (name == "align" || name == "align*") {
1218                                 cell->push_back(MathAtom(new InsetMathHull(hullAlign)));
1219                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1220                         }
1221
1222                         else if (name == "flalign" || name == "flalign*") {
1223                                 cell->push_back(MathAtom(new InsetMathHull(hullFlAlign)));
1224                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1225                         }
1226
1227                         else if (name == "alignat" || name == "alignat*") {
1228                                 // ignore this for a while
1229                                 getArg('{', '}');
1230                                 cell->push_back(MathAtom(new InsetMathHull(hullAlignAt)));
1231                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1232                         }
1233
1234                         else if (name == "xalignat" || name == "xalignat*") {
1235                                 // ignore this for a while
1236                                 getArg('{', '}');
1237                                 cell->push_back(MathAtom(new InsetMathHull(hullXAlignAt)));
1238                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1239                         }
1240
1241                         else if (name == "xxalignat") {
1242                                 // ignore this for a while
1243                                 getArg('{', '}');
1244                                 cell->push_back(MathAtom(new InsetMathHull(hullXXAlignAt)));
1245                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1246                         }
1247
1248                         else if (name == "multline" || name == "multline*") {
1249                                 cell->push_back(MathAtom(new InsetMathHull(hullMultline)));
1250                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1251                         }
1252
1253                         else if (name == "gather" || name == "gather*") {
1254                                 cell->push_back(MathAtom(new InsetMathHull(hullGather)));
1255                                 parse2(cell->back(), FLAG_END, InsetMath::MATH_MODE, !stared(name));
1256                         }
1257
1258                         else if (latexkeys const * l = in_word_set(name)) {
1259                                 if (l->inset == "matrix") {
1260                                         cell->push_back(createInsetMath(name));
1261                                         parse2(cell->back(), FLAG_END, mode, false);
1262                                 } else if (l->inset == "split") {
1263                                         docstring const valign = parse_verbatim_option() + 'c';
1264                                         cell->push_back(MathAtom(new InsetMathSplit(name, (char)valign[0])));
1265                                         parse2(cell->back(), FLAG_END, mode, false);
1266                                 } else {
1267                                         dump();
1268                                         lyxerr << "found math environment `" << to_utf8(name)
1269                                                << "' in symbols file with unsupported inset `"
1270                                                << to_utf8(l->inset) << "'." << endl;
1271                                         // create generic environment inset
1272                                         cell->push_back(MathAtom(new InsetMathEnv(name)));
1273                                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1274                                 }
1275                         }
1276
1277                         else {
1278                                 dump();
1279                                 lyxerr << "found unknown math environment '" << to_utf8(name)
1280                                         << "'" << endl;
1281                                 // create generic environment inset
1282                                 cell->push_back(MathAtom(new InsetMathEnv(name)));
1283                                 parse(cell->back().nucleus()->cell(0), FLAG_ITEM, mode);
1284                         }
1285                 }
1286
1287                 else if (t.cs() == "kern") {
1288                         // FIXME: A hack...
1289                         docstring s;
1290                         while (true) {
1291                                 Token const & t = getToken();
1292                                 if (!good()) {
1293                                         putback();
1294                                         break;
1295                                 }
1296                                 s += t.character();
1297                                 if (isValidLength(to_utf8(s)))
1298                                         break;
1299                         }
1300                         cell->push_back(MathAtom(new InsetMathKern(s)));
1301                 }
1302
1303                 else if (t.cs() == "label") {
1304                         // FIXME: This is swallowed in inline formulas
1305                         docstring label = parse_verbatim_item();
1306                         MathData ar;
1307                         asArray(label, ar);
1308                         if (grid.asHullInset()) {
1309                                 grid.asHullInset()->label(cellrow, label);
1310                         } else {
1311                                 cell->push_back(createInsetMath(t.cs()));
1312                                 cell->push_back(MathAtom(new InsetMathBrace(ar)));
1313                         }
1314                 }
1315
1316                 else if (t.cs() == "choose" || t.cs() == "over" || t.cs() == "atop") {
1317                         MathAtom at = createInsetMath(t.cs());
1318                         at.nucleus()->cell(0) = *cell;
1319                         cell->clear();
1320                         parse(at.nucleus()->cell(1), flags, mode);
1321                         cell->push_back(at);
1322                         return;
1323                 }
1324
1325                 else if (t.cs() == "color") {
1326                         docstring const color = parse_verbatim_item();
1327                         cell->push_back(MathAtom(new InsetMathColor(true, color)));
1328                         parse(cell->back().nucleus()->cell(0), flags, mode);
1329                         return;
1330                 }
1331
1332                 else if (t.cs() == "textcolor") {
1333                         docstring const color = parse_verbatim_item();
1334                         cell->push_back(MathAtom(new InsetMathColor(false, color)));
1335                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, InsetMath::TEXT_MODE);
1336                 }
1337
1338                 else if (t.cs() == "normalcolor") {
1339                         cell->push_back(createInsetMath(t.cs()));
1340                         parse(cell->back().nucleus()->cell(0), flags, mode);
1341                         return;
1342                 }
1343
1344                 else if (t.cs() == "substack") {
1345                         cell->push_back(createInsetMath(t.cs()));
1346                         parse2(cell->back(), FLAG_ITEM, mode, false);
1347                 }
1348
1349                 else if (t.cs() == "xymatrix") {
1350                         odocstringstream os;
1351                         while (good() && nextToken().cat() != catBegin)
1352                                 os << getToken().asInput();
1353                         cell->push_back(createInsetMath(t.cs() + os.str()));
1354                         parse2(cell->back(), FLAG_ITEM, mode, false);
1355                 }
1356
1357                 else if (t.cs() == "framebox" || t.cs() == "makebox") {
1358                         cell->push_back(createInsetMath(t.cs()));
1359                         parse(cell->back().nucleus()->cell(0), FLAG_OPTION, InsetMath::TEXT_MODE);
1360                         parse(cell->back().nucleus()->cell(1), FLAG_OPTION, InsetMath::TEXT_MODE);
1361                         parse(cell->back().nucleus()->cell(2), FLAG_ITEM, InsetMath::TEXT_MODE);
1362                 }
1363
1364                 else if (t.cs() == "tag") {
1365                         if (nextToken().character() == '*') {
1366                                 getToken();
1367                                 cell->push_back(createInsetMath(t.cs() + '*'));
1368                         } else
1369                                 cell->push_back(createInsetMath(t.cs()));
1370                         parse(cell->back().nucleus()->cell(0), FLAG_ITEM, InsetMath::TEXT_MODE);
1371                 }
1372
1373 #if 0
1374                 else if (t.cs() == "infer") {
1375                         MathData ar;
1376                         parse(ar, FLAG_OPTION, mode);
1377                         cell->push_back(createInsetMath(t.cs()));
1378                         parse2(cell->back(), FLAG_ITEM, mode, false);
1379                 }
1380
1381                 // Disabled
1382                 else if (1 && t.cs() == "ar") {
1383                         auto_ptr<InsetMathXYArrow> p(new InsetMathXYArrow);
1384                         // try to read target
1385                         parse(p->cell(0), FLAG_OTPTION, mode);
1386                         // try to read label
1387                         if (nextToken().cat() == catSuper || nextToken().cat() == catSub) {
1388                                 p->up_ = nextToken().cat() == catSuper;
1389                                 getToken();
1390                                 parse(p->cell(1), FLAG_ITEM, mode);
1391                                 //lyxerr << "read label: " << p->cell(1) << endl;
1392                         }
1393
1394                         cell->push_back(MathAtom(p.release()));
1395                         //lyxerr << "read cell: " << cell << endl;
1396                 }
1397 #endif
1398
1399                 else if (t.cs().size()) {
1400                         latexkeys const * l = in_word_set(t.cs());
1401                         if (l) {
1402                                 if (l->inset == "big") {
1403                                         skipSpaces();
1404                                         docstring const delim = getToken().asInput();
1405                                         if (InsetMathBig::isBigInsetDelim(delim))
1406                                                 cell->push_back(MathAtom(
1407                                                         new InsetMathBig(t.cs(), delim)));
1408                                         else {
1409                                                 cell->push_back(createInsetMath(t.cs()));
1410                                                 putback();
1411                                         }
1412                                 }
1413
1414                                 else if (l->inset == "font") {
1415                                         cell->push_back(createInsetMath(t.cs()));
1416                                         parse(cell->back().nucleus()->cell(0),
1417                                                 FLAG_ITEM, asMode(mode, l->extra));
1418                                 }
1419
1420                                 else if (l->inset == "oldfont") {
1421                                         cell->push_back(createInsetMath(t.cs()));
1422                                         parse(cell->back().nucleus()->cell(0),
1423                                                 flags | FLAG_ALIGN, asMode(mode, l->extra));
1424                                         if (prevToken().cat() != catAlign &&
1425                                             prevToken().cs() != "\\")
1426                                                 return;
1427                                         putback();
1428                                 }
1429
1430                                 else if (l->inset == "style") {
1431                                         cell->push_back(createInsetMath(t.cs()));
1432                                         parse(cell->back().nucleus()->cell(0),
1433                                                 flags | FLAG_ALIGN, mode);
1434                                         if (prevToken().cat() != catAlign &&
1435                                             prevToken().cs() != "\\")
1436                                                 return;
1437                                         putback();
1438                                 }
1439
1440                                 else {
1441                                         MathAtom at = createInsetMath(t.cs());
1442                                         for (InsetMath::idx_type i = 0; i < at->nargs(); ++i)
1443                                                 parse(at.nucleus()->cell(i),
1444                                                         FLAG_ITEM, asMode(mode, l->extra));
1445                                         cell->push_back(at);
1446                                 }
1447                         }
1448
1449                         else {
1450                                 MathAtom at = createInsetMath(t.cs());
1451                                 InsetMath::mode_type m = mode;
1452                                 //if (m == InsetMath::UNDECIDED_MODE)
1453                                 //lyxerr << "default creation: m1: " << m << endl;
1454                                 if (at->currentMode() != InsetMath::UNDECIDED_MODE)
1455                                         m = at->currentMode();
1456                                 //lyxerr << "default creation: m2: " << m << endl;
1457                                 InsetMath::idx_type start = 0;
1458                                 // this fails on \bigg[...\bigg]
1459                                 //MathData opt;
1460                                 //parse(opt, FLAG_OPTION, InsetMath::VERBATIM_MODE);
1461                                 //if (opt.size()) {
1462                                 //      start = 1;
1463                                 //      at.nucleus()->cell(0) = opt;
1464                                 //}
1465                                 for (InsetMath::idx_type i = start; i < at->nargs(); ++i) {
1466                                         parse(at.nucleus()->cell(i), FLAG_ITEM, m);
1467                                         skipSpaces();
1468                                 }
1469                                 cell->push_back(at);
1470                         }
1471                 }
1472
1473
1474                 if (flags & FLAG_LEAVE) {
1475                         flags &= ~FLAG_LEAVE;
1476                         break;
1477                 }
1478         }
1479 }
1480
1481
1482
1483 } // anonymous namespace
1484
1485
1486 void mathed_parse_cell(MathData & ar, docstring const & str)
1487 {
1488         Parser(str).parse(ar, 0, InsetMath::MATH_MODE);
1489 }
1490
1491
1492 void mathed_parse_cell(MathData & ar, istream & is)
1493 {
1494         Parser(is).parse(ar, 0, InsetMath::MATH_MODE);
1495 }
1496
1497
1498 bool mathed_parse_normal(MathAtom & t, docstring const & str)
1499 {
1500         return Parser(str).parse(t);
1501 }
1502
1503
1504 bool mathed_parse_normal(MathAtom & t, Lexer & lex)
1505 {
1506         return Parser(lex).parse(t);
1507 }
1508
1509
1510 void mathed_parse_normal(InsetMathGrid & grid, docstring const & str)
1511 {
1512         Parser(str).parse1(grid, 0, InsetMath::MATH_MODE, false);
1513 }
1514
1515
1516 void initParser()
1517 {
1518         fill(theCatcode, theCatcode + 128, catOther);
1519         fill(theCatcode + 'a', theCatcode + 'z' + 1, catLetter);
1520         fill(theCatcode + 'A', theCatcode + 'Z' + 1, catLetter);
1521
1522         theCatcode[int('\\')] = catEscape;
1523         theCatcode[int('{')]  = catBegin;
1524         theCatcode[int('}')]  = catEnd;
1525         theCatcode[int('$')]  = catMath;
1526         theCatcode[int('&')]  = catAlign;
1527         theCatcode[int('\n')] = catNewline;
1528         theCatcode[int('#')]  = catParameter;
1529         theCatcode[int('^')]  = catSuper;
1530         theCatcode[int('_')]  = catSub;
1531         theCatcode[int(0x7f)] = catIgnore;
1532         theCatcode[int(' ')]  = catSpace;
1533         theCatcode[int('\t')] = catSpace;
1534         theCatcode[int('\r')] = catNewline;
1535         theCatcode[int('~')]  = catActive;
1536         theCatcode[int('%')]  = catComment;
1537 }
1538
1539
1540 } // namespace lyx