src/mathed/math_parser.C

   1 /** The math parser
   2     \author André Pönitz (2001)
   3  */
   4
   5 /*
   6
   7 If someone desperately needs partial "structures" (such as a few
   8 cells of an array inset or similar) (s)he could uses the
   9 following hack as starting point to write some macros:
  10
  11   \newif\ifcomment
  12   \commentfalse
  13   \ifcomment
  14           \def\makeamptab{\catcode`\&=4\relax}
  15           \def\makeampletter{\catcode`\&=11\relax}
  16     \def\b{\makeampletter\expandafter\makeamptab\bi}
  17     \long\def\bi#1\e{}
  18   \else
  19     \def\b{}\def\e{}
  20   \fi
  21
  22   ...
  23
  24   \[\begin{array}{ccc}
  25    1 & 2\b & 3^2\\
  26    4 & 5\e & 6\\
  27    7 & 8 & 9
  28   \end{array}\]
  29
  30 */
  31
  32
  33 #include <config.h>
  34
  35 #ifdef __GNUG__
  36 #pragma implementation
  37 #endif
  38
  39 #include "math_parser.h"
  40 #include "math_inset.h"
  41 #include "math_arrayinset.h"
  42 #include "math_braceinset.h"
  43 #include "math_boxinset.h"
  44 #include "math_charinset.h"
  45 #include "math_deliminset.h"
  46 #include "math_extern.h"
  47 #include "math_factory.h"
  48 #include "math_kerninset.h"
  49 #include "math_macro.h"
  50 #include "math_macrotable.h"
  51 #include "math_macrotemplate.h"
  52 #include "math_hullinset.h"
  53 #include "math_rootinset.h"
  54 #include "math_sizeinset.h"
  55 #include "math_sqrtinset.h"
  56 #include "math_scriptinset.h"
  57 #include "math_sqrtinset.h"
  58 #include "math_support.h"
  59 #include "math_xyarrowinset.h"
  60
  61 #include "ref_inset.h"
  62
  63 #include "lyxlex.h"
  64 #include "debug.h"
  65 #include "support/LAssert.h"
  66 #include "support/lstrings.h"
  67
  68 #include <cctype>
  69 #include <stack>
  70 #include <algorithm>
  71
  72 using std::istream;
  73 using std::ostream;
  74 using std::ios;
  75 using std::endl;
  76 using std::stack;
  77 using std::fill;
  78 using std::vector;
  79 using std::atoi;
  80
  81
  82 //#define FILEDEBUG
  83
  84
  85 namespace {
  86
  87 bool stared(string const & s)
  88 {
  89         string::size_type const n = s.size();
  90         return n && s[n - 1] == '*';
  91 }
  92
  93
  94 // These are TeX's catcodes
  95 enum CatCode {
  96         catEscape,     // 0    backslash
  97         catBegin,      // 1    {
  98         catEnd,        // 2    }
  99         catMath,       // 3    $
 100         catAlign,      // 4    &
 101         catNewline,    // 5    ^^M
 102         catParameter,  // 6    #
 103         catSuper,      // 7    ^
 104         catSub,        // 8    _
 105         catIgnore,     // 9
 106         catSpace,      // 10   space
 107         catLetter,     // 11   a-zA-Z
 108         catOther,      // 12   none of the above
 109         catActive,     // 13   ~
 110         catComment,    // 14   %
 111         catInvalid     // 15   <delete>
 112 };
 113
 114 CatCode theCatcode[256];
 115
 116
 117 inline CatCode catcode(unsigned char c)
 118 {
 119         return theCatcode[c];
 120 }
 121
 122
 123 enum {
 124         FLAG_BRACE_LAST = 1 << 1,  //  last closing brace ends the parsing
 125         FLAG_RIGHT      = 1 << 2,  //  next \\right ends the parsing process
 126         FLAG_END        = 1 << 3,  //  next \\end ends the parsing process
 127         FLAG_BRACK_END  = 1 << 4,  //  next closing bracket ends the parsing
 128         FLAG_TEXTMODE   = 1 << 5,  //  we are in a box
 129         FLAG_ITEM       = 1 << 6,  //  read a (possibly braced token)
 130         FLAG_LEAVE      = 1 << 7,  //  leave the loop at the end
 131         FLAG_SIMPLE     = 1 << 8,  //  next $ leaves the loop
 132         FLAG_EQUATION   = 1 << 9,  //  next \] leaves the loop
 133         FLAG_SIMPLE2    = 1 << 10  //  next \) leaves the loop
 134 };
 135
 136
 137 void catInit()
 138 {
 139         fill(theCatcode, theCatcode + 256, catOther);
 140         fill(theCatcode + 'a', theCatcode + 'z' + 1, catLetter);
 141         fill(theCatcode + 'A', theCatcode + 'Z' + 1, catLetter);
 142
 143         theCatcode['\\'] = catEscape;
 144         theCatcode['{']  = catBegin;
 145         theCatcode['}']  = catEnd;
 146         theCatcode['$']  = catMath;
 147         theCatcode['&']  = catAlign;
 148         theCatcode['\n'] = catNewline;
 149         theCatcode['#']  = catParameter;
 150         theCatcode['^']  = catSuper;
 151         theCatcode['_']  = catSub;
 152         theCatcode['\7f'] = catIgnore;
 153         theCatcode[' ']  = catSpace;
 154         theCatcode['\t'] = catSpace;
 155         theCatcode['\r'] = catSpace;
 156         theCatcode['~']  = catActive;
 157         theCatcode['%']  = catComment;
 158 }
 159
 160
 161
 162 //
 163 // Helper class for parsing
 164 //
 165
 166 class Token {
 167 public:
 168         ///
 169         Token() : cs_(), char_(0), cat_(catIgnore) {}
 170         ///
 171         Token(char c, CatCode cat) : cs_(), char_(c), cat_(cat) {}
 172         ///
 173         Token(string const & cs) : cs_(cs), char_(0), cat_(catIgnore) {}
 174
 175         ///
 176         string const & cs() const { return cs_; }
 177         ///
 178         CatCode cat() const { return cat_; }
 179         ///
 180         char character() const { return char_; }
 181         ///
 182         string asString() const;
 183         ///
 184         bool isCR() const;
 185
 186 private:
 187         ///
 188         string cs_;
 189         ///
 190         char char_;
 191         ///
 192         CatCode cat_;
 193 };
 194
 195 bool Token::isCR() const
 196 {
 197         return cs_ == "\\" || cs_ == "cr" || cs_ == "crcr";
 198 }
 199
 200 string Token::asString() const
 201 {
 202         return cs_.size() ? cs_ : string(1, char_);
 203 }
 204
 205 ostream & operator<<(ostream & os, Token const & t)
 206 {
 207         if (t.cs().size())
 208                 os << "\\" << t.cs();
 209         else
 210                 os << "[" << t.character() << "," << t.cat() << "]";
 211         return os;
 212 }
 213
 214
 215 class Parser {
 216
 217 public:
 218         ///
 219         Parser(LyXLex & lex);
 220         ///
 221         Parser(istream & is);
 222
 223         ///
 224         bool parse_macro(string & name);
 225         ///
 226         bool parse_normal(MathAtom & at);
 227         ///
 228         void parse_into(MathArray & array, unsigned flags, bool mathmode);
 229         ///
 230         int lineno() const { return lineno_; }
 231         ///
 232         void putback();
 233
 234 private:
 235         ///
 236         void parse_into1(MathGridInset & grid, unsigned flags, bool mathmode, bool numbered);
 237         ///
 238         void parse_into2(MathAtom & at, unsigned flags, bool mathmode, bool numbered);
 239         /// get arg delimited by 'left' and 'right'
 240         string getArg(char left, char right);
 241         ///
 242         char getChar();
 243         ///
 244         void error(string const & msg);
 245         /// dump contents to screen
 246         void dump() const;
 247
 248 private:
 249         ///
 250         void tokenize(istream & is);
 251         ///
 252         void tokenize(string const & s);
 253         ///
 254         void skipSpaceTokens(istream & is, char c);
 255         ///
 256         void push_back(Token const & t);
 257         ///
 258         void pop_back();
 259         ///
 260         Token const & prevToken() const;
 261         ///
 262         Token const & nextToken() const;
 263         ///
 264         Token const & getToken();
 265         /// skips spaces if any
 266         void skipSpaces();
 267         ///
 268         void lex(string const & s);
 269         ///
 270         bool good() const;
 271
 272         ///
 273         int lineno_;
 274         ///
 275         vector<Token> tokens_;
 276         ///
 277         unsigned pos_;
 278 };
 279
 280
 281 Parser::Parser(LyXLex & lexer)
 282         : lineno_(lexer.getLineNo()), pos_(0)
 283 {
 284         tokenize(lexer.getStream());
 285         lexer.eatLine();
 286 }
 287
 288
 289 Parser::Parser(istream & is)
 290         : lineno_(0), pos_(0)
 291 {
 292         tokenize(is);
 293 }
 294
 295
 296 void Parser::push_back(Token const & t)
 297 {
 298         tokens_.push_back(t);
 299 }
 300
 301
 302 void Parser::pop_back()
 303 {
 304         tokens_.pop_back();
 305 }
 306
 307
 308 Token const & Parser::prevToken() const
 309 {
 310         static const Token dummy;
 311         return pos_ > 0 ? tokens_[pos_ - 1] : dummy;
 312 }
 313
 314
 315 Token const & Parser::nextToken() const
 316 {
 317         static const Token dummy;
 318         return good() ? tokens_[pos_] : dummy;
 319 }
 320
 321
 322 Token const & Parser::getToken()
 323 {
 324         static const Token dummy;
 325         //lyxerr << "looking at token " << tokens_[pos_] << " pos: " << pos_ << '\n';
 326         return good() ? tokens_[pos_++] : dummy;
 327 }
 328
 329
 330 void Parser::skipSpaces()
 331 {
 332         while (nextToken().cat() == catSpace)
 333                 getToken();
 334 }
 335
 336
 337 void Parser::putback()
 338 {
 339         --pos_;
 340 }
 341
 342
 343 bool Parser::good() const
 344 {
 345         return pos_ < tokens_.size();
 346 }
 347
 348
 349 char Parser::getChar()
 350 {
 351         if (!good())
 352                 error("The input stream is not well...");
 353         return tokens_[pos_++].character();
 354 }
 355
 356
 357 string Parser::getArg(char left, char right)
 358 {
 359         skipSpaces();
 360
 361         string result;
 362         char c = getChar();
 363
 364         if (c != left)
 365                 putback();
 366         else
 367                 while ((c = getChar()) != right && good())
 368                         result += c;
 369
 370         return result;
 371 }
 372
 373
 374 void Parser::tokenize(istream & is)
 375 {
 376         // eat everything up to the next \end_inset or end of stream
 377         // and store it in s for further tokenization
 378         string s;
 379         char c;
 380         while (is.get(c)) {
 381                 s += c;
 382                 if (s.size() >= 10 && s.substr(s.size() - 10) == "\\end_inset") {
 383                         s = s.substr(0, s.size() - 10);
 384                         break;
 385                 }
 386         }
 387
 388         // tokenize buffer
 389         tokenize(s);
 390 }
 391
 392
 393 void Parser::skipSpaceTokens(istream & is, char c)
 394 {
 395         // skip trailing spaces
 396         while (catcode(c) == catSpace || catcode(c) == catNewline)
 397                 if (!is.get(c))
 398                         break;
 399         //lyxerr << "putting back: " << c << "\n";
 400         is.putback(c);
 401 }
 402
 403
 404 void Parser::tokenize(string const & buffer)
 405 {
 406         static bool init_done = false;
 407
 408         if (!init_done) {
 409                 catInit();
 410                 init_done = true;
 411         }
 412
 413         istringstream is(buffer.c_str(), ios::in | ios::binary);
 414
 415         char c;
 416         while (is.get(c)) {
 417                 //lyxerr << "reading c: " << c << "\n";
 418
 419                 switch (catcode(c)) {
 420                         case catNewline: {
 421                                 ++lineno_;
 422                                 is.get(c);
 423                                 if (catcode(c) == catNewline)
 424                                         ; //push_back(Token("par"));
 425                                 else {
 426                                         push_back(Token(' ', catSpace));
 427                                         is.putback(c);
 428                                 }
 429                                 break;
 430                         }
 431
 432                         case catComment: {
 433                                 while (is.get(c) && catcode(c) != catNewline)
 434                                         ;
 435                                 ++lineno_;
 436                                 break;
 437                         }
 438
 439                         case catEscape: {
 440                                 is.get(c);
 441                                 if (!is) {
 442                                         error("unexpected end of input");
 443                                 } else {
 444                                         string s(1, c);
 445                                         if (catcode(c) == catLetter) {
 446                                                 // collect letters
 447                                                 while (is.get(c) && catcode(c) == catLetter)
 448                                                         s += c;
 449                                                 skipSpaceTokens(is, c);
 450                                         }
 451                                         push_back(Token(s));
 452                                 }
 453                                 break;
 454                         }
 455
 456                         case catSuper:
 457                         case catSub: {
 458                                 push_back(Token(c, catcode(c)));
 459                                 is.get(c);
 460                                 skipSpaceTokens(is, c);
 461                                 break;
 462                         }
 463
 464                         case catIgnore: {
 465                                 lyxerr << "ignoring a char: " << int(c) << "\n";
 466                                 break;
 467                         }
 468
 469                         default:
 470                                 push_back(Token(c, catcode(c)));
 471                 }
 472         }
 473
 474 #ifdef FILEDEBUG
 475         dump();
 476 #endif
 477 }
 478
 479
 480 void Parser::dump() const
 481 {
 482         lyxerr << "\nTokens: ";
 483         for (unsigned i = 0; i < tokens_.size(); ++i) {
 484                 if (i == pos_)
 485                         lyxerr << " <#> ";
 486                 lyxerr << tokens_[i];
 487         }
 488         lyxerr << " pos: " << pos_ << "\n";
 489 }
 490
 491
 492 void Parser::error(string const & msg)
 493 {
 494         lyxerr << "Line ~" << lineno_ << ": Math parse error: " << msg << endl;
 495         dump();
 496         //exit(1);
 497 }
 498
 499
 500 bool Parser::parse_macro(string & name)
 501 {
 502         int nargs = 0;
 503         name = "{error}";
 504         skipSpaces();
 505
 506         if (nextToken().cs() == "def") {
 507
 508                 getToken();
 509                 name = getToken().cs();
 510
 511                 string pars;
 512                 while (good() && nextToken().cat() != catBegin)
 513                         pars += getToken().cs();
 514
 515                 if (!good()) {
 516                         error("bad stream in parse_macro\n");
 517                         return false;
 518                 }
 519
 520                 //lyxerr << "read \\def parameter list '" << pars << "'\n";
 521                 if (!pars.empty()) {
 522                         error("can't handle non-empty parameter lists\n");
 523                         return false;
 524                 }
 525
 526         } else if (nextToken().cs() == "newcommand") {
 527
 528                 getToken();
 529
 530                 if (getToken().cat() != catBegin) {
 531                         error("'{' in \\newcommand expected (1) \n");
 532                         return false;
 533                 }
 534
 535                 name = getToken().cs();
 536
 537                 if (getToken().cat() != catEnd) {
 538                         error("'}' expected\n");
 539                         return false;
 540                 }
 541
 542                 string arg  = getArg('[', ']');
 543                 if (!arg.empty())
 544                         nargs = atoi(arg.c_str());
 545
 546         } else {
 547                 lyxerr << "\\newcommand or \\def  expected\n";
 548                 return false;
 549         }
 550
 551
 552         if (getToken().cat() != catBegin) {
 553                 error("'{' in macro definition expected (2)\n");
 554                 return false;
 555         }
 556
 557         MathArray ar1;
 558         parse_into(ar1, FLAG_BRACE_LAST, true);
 559
 560         // we cannot handle recursive stuff at all
 561         MathArray test;
 562         test.push_back(createMathInset(name));
 563         if (ar1.contains(test)) {
 564                 error("we cannot handle recursive macros at all.\n");
 565                 return false;
 566         }
 567
 568         // is a version for display attached?
 569         MathArray ar2;
 570         parse_into(ar2, FLAG_ITEM, true);
 571
 572         MathMacroTable::create(name, nargs, ar1, ar2);
 573         return true;
 574 }
 575
 576
 577 bool Parser::parse_normal(MathAtom & at)
 578 {
 579         skipSpaces();
 580         MathArray ar;
 581         parse_into(ar, false, false);
 582         if (ar.size() != 1) {
 583                 lyxerr << "Unusual contents found: " << ar << endl;
 584                 at.reset(new MathParInset);
 585                 at->cell(0) = ar;
 586                 return true;
 587         }
 588         at = ar[0];
 589         return true;
 590 }
 591
 592
 593 void Parser::parse_into(MathArray & array, unsigned flags, bool mathmode)
 594 {
 595         MathGridInset grid(1, 1);
 596         parse_into1(grid, flags, mathmode, false);
 597         array = grid.cell(0);
 598         // remove 'unnecessary' braces:
 599         //if (array.size() == 1 && array.back()->asBraceInset()) {
 600         //      lyxerr << "extra braces removed\n";
 601         //      array = array.back()->asBraceInset()->cell(0);
 602         //}
 603 }
 604
 605
 606 void Parser::parse_into2(MathAtom & at, unsigned flags,
 607         bool mathmode, bool numbered)
 608 {
 609         parse_into1(*(at->asGridInset()), flags, mathmode, numbered);
 610 }
 611
 612
 613 void Parser::parse_into1(MathGridInset & grid, unsigned flags,
 614         bool mathmode, bool numbered)
 615 {
 616         int  limits = 0;
 617         MathGridInset::row_type cellrow = 0;
 618         MathGridInset::col_type cellcol = 0;
 619         MathArray * cell = &grid.cell(grid.index(cellrow, cellcol));
 620
 621         if (grid.asHullInset())
 622                 grid.asHullInset()->numbered(cellrow, numbered);
 623
 624         //dump();
 625         //lyxerr << "grid: " << grid << endl;
 626
 627         while (good()) {
 628                 Token const & t = getToken();
 629
 630 #ifdef FILEDEBUG
 631                 lyxerr << "t: " << t << " flags: " << flags << "\n";
 632                 //cell->dump();
 633                 lyxerr << "\n";
 634 #endif
 635
 636                 if (flags & FLAG_ITEM) {
 637                         if (t.cat() == catSpace)
 638                                 continue;
 639
 640                         flags &= ~FLAG_ITEM;
 641                         if (t.cat() == catBegin) {
 642                                 // skip the brace and collect everything to the next matching
 643                                 // closing brace
 644                                 flags |= FLAG_BRACE_LAST;
 645                                 continue;
 646                         }
 647
 648                         // handle only this single token, leave the loop if done
 649                         flags |= FLAG_LEAVE;
 650                 }
 651
 652                 //
 653                 // cat codes
 654                 //
 655                 if (t.cat() == catMath) {
 656                         if (!mathmode) {
 657                                 // we are inside some text mode thingy, so opening new math is allowed
 658                                 Token const & n = getToken();
 659                                 if (n.cat() == catMath) {
 660                                         // TeX's $$...$$ syntax for displayed math
 661                                         cell->push_back(MathAtom(new MathHullInset(LM_OT_EQUATION)));
 662                                         parse_into2(cell->back(), FLAG_SIMPLE, true, false);
 663                                         getToken(); // skip the second '$' token
 664                                 } else {
 665                                         // simple $...$  stuff
 666                                         putback();
 667                                         cell->push_back(MathAtom(new MathHullInset(LM_OT_SIMPLE)));
 668                                         parse_into2(cell->back(), FLAG_SIMPLE, true, false);
 669                                 }
 670                         }
 671
 672                         else if (flags & FLAG_SIMPLE) {
 673                                 // this is the end of the formula
 674                                 return;
 675                         }
 676
 677                         else {
 678                                 error("something strange in the parser\n");
 679                                 break;
 680                         }
 681                 }
 682
 683                 else if (t.cat() == catLetter)
 684                         cell->push_back(MathAtom(new MathCharInset(t.character())));
 685
 686                 else if (t.cat() == catSpace && !mathmode)
 687                         cell->push_back(MathAtom(new MathCharInset(t.character())));
 688
 689                 else if (t.cat() == catParameter) {
 690                         Token const & n = getToken();
 691                         cell->push_back(MathAtom(new MathMacroArgument(n.character()-'0')));
 692                 }
 693
 694                 else if (t.cat() == catBegin) {
 695                         MathArray ar;
 696                         parse_into(ar, FLAG_BRACE_LAST, mathmode);
 697                         cell->push_back(MathAtom(new MathBraceInset));
 698                         cell->back()->cell(0).swap(ar);
 699                 }
 700
 701                 else if (t.cat() == catEnd) {
 702                         if (flags & FLAG_BRACE_LAST)
 703                                 return;
 704                         error("found '}' unexpectedly");
 705                         //lyx::Assert(0);
 706                         //add(cell, '}', LM_TC_TEX);
 707                 }
 708
 709                 else if (t.cat() == catAlign) {
 710                         ++cellcol;
 711                         //lyxerr << " column now " << cellcol << " max: " << grid.ncols() << "\n";
 712                         if (cellcol == grid.ncols()) {
 713                                 lyxerr << "adding column " << cellcol << "\n";
 714                                 grid.addCol(cellcol - 1);
 715                         }
 716                         cell = &grid.cell(grid.index(cellrow, cellcol));
 717                 }
 718
 719                 else if (t.cat() == catSuper || t.cat() == catSub) {
 720                         bool up = (t.cat() == catSuper);
 721                         MathScriptInset * p = 0;
 722                         if (cell->size())
 723                                 p = cell->back()->asScriptInset();
 724                         if (!p || p->has(up)) {
 725                                 cell->push_back(MathAtom(new MathScriptInset(up)));
 726                                 p = cell->back()->asScriptInset();
 727                         }
 728                         p->ensure(up);
 729                         parse_into(p->cell(up), FLAG_ITEM, mathmode);
 730                         p->limits(limits);
 731                         limits = 0;
 732                 }
 733
 734                 else if (t.character() == ']' && (flags & FLAG_BRACK_END))
 735                         return;
 736
 737                 else if (t.cat() == catOther)
 738                         cell->push_back(MathAtom(new MathCharInset(t.character())));
 739
 740                 //
 741                 // control sequences
 742                 //
 743                 else if (t.cs() == "(") {
 744                         cell->push_back(MathAtom(new MathHullInset(LM_OT_SIMPLE)));
 745                         parse_into2(cell->back(), FLAG_SIMPLE2, true, false);
 746                 }
 747
 748                 else if (t.cs() == "[") {
 749                         cell->push_back(MathAtom(new MathHullInset(LM_OT_EQUATION)));
 750                         parse_into2(cell->back(), FLAG_EQUATION, true, false);
 751                 }
 752
 753                 else if (t.cs() == "protect")
 754                         // ignore \\protect, will hopefully be re-added during output
 755                         ;
 756
 757                 else if (t.cs() == "end") {
 758                         if (flags & FLAG_END) {
 759                                 // eat environment name
 760                                 //string const name =
 761                                 getArg('{', '}');
 762                                 // FIXME: check that we ended the correct environment
 763                                 return;
 764                         }
 765                         error("found 'end' unexpectedly");
 766                 }
 767
 768                 else if (t.cs() == ")") {
 769                         if (flags & FLAG_SIMPLE2)
 770                                 return;
 771                         error("found '\\)' unexpectedly");
 772                 }
 773
 774                 else if (t.cs() == "]") {
 775                         if (flags & FLAG_EQUATION)
 776                                 return;
 777                         error("found '\\]' unexpectedly");
 778                 }
 779
 780                 else if (t.cs() == "\\") {
 781                         grid.vcrskip(LyXLength(getArg('[', ']')), cellrow);
 782                         ++cellrow;
 783                         cellcol = 0;
 784                         if (cellrow == grid.nrows())
 785                                 grid.addRow(cellrow - 1);
 786                         if (grid.asHullInset())
 787                                 grid.asHullInset()->numbered(cellrow, numbered);
 788                         cell = &grid.cell(grid.index(cellrow, cellcol));
 789                 }
 790
 791 #if 1
 792                 else if (t.cs() == "multicolumn") {
 793                         // extract column count and insert dummy cells
 794                         MathArray count;
 795                         parse_into(count, FLAG_ITEM, mathmode);
 796                         int cols = 1;
 797                         if (!extractNumber(count, cols)) {
 798                                 lyxerr << " can't extract number of cells from " << count << "\n";
 799                         }
 800                         // resize the table if necessary
 801                         for (int i = 0; i < cols; ++i) {
 802                                 ++cellcol;
 803                                 if (cellcol == grid.ncols()) {
 804                                         lyxerr << "adding column " << cellcol << "\n";
 805                                         grid.addCol(cellcol - 1);
 806                                 }
 807                                 cell = &grid.cell(grid.index(cellrow, cellcol));
 808                                 // mark this as dummy
 809                                 grid.cellinfo(grid.index(cellrow, cellcol)).dummy_ = true;
 810                         }
 811                         // the last cell is the real thng, not a dummy
 812                         grid.cellinfo(grid.index(cellrow, cellcol)).dummy_ = false;
 813
 814                         // read special alignment
 815                         MathArray align;
 816                         parse_into(align, FLAG_ITEM, mathmode);
 817                         //grid.cellinfo(grid.index(cellrow, cellcol)).align_ = extractString(align);
 818
 819                         // parse the remaining contents into the "real" cell
 820                         parse_into(*cell, FLAG_ITEM, mathmode);
 821                 }
 822 #endif
 823
 824                 else if (t.cs() == "limits")
 825                         limits = 1;
 826
 827                 else if (t.cs() == "nolimits")
 828                         limits = -1;
 829
 830                 else if (t.cs() == "nonumber") {
 831                         if (grid.asHullInset())
 832                                 grid.asHullInset()->numbered(cellrow, false);
 833                 }
 834
 835                 else if (t.cs() == "number") {
 836                         if (grid.asHullInset())
 837                                 grid.asHullInset()->numbered(cellrow, true);
 838                 }
 839
 840                 else if (t.cs() == "hline") {
 841                         if (grid.asHullInset())
 842                                 grid.asHullInset()->rowinfo(cellrow + 1);
 843                 }
 844
 845                 else if (t.cs() == "sqrt") {
 846                         char c = getChar();
 847                         if (c == '[') {
 848                                 cell->push_back(MathAtom(new MathRootInset));
 849                                 parse_into(cell->back()->cell(0), FLAG_BRACK_END, mathmode);
 850                                 parse_into(cell->back()->cell(1), FLAG_ITEM, mathmode);
 851                         } else {
 852                                 putback();
 853                                 cell->push_back(MathAtom(new MathSqrtInset));
 854                                 parse_into(cell->back()->cell(0), FLAG_ITEM, mathmode);
 855                         }
 856                 }
 857
 858                 else if (t.cs() == "ref") {
 859                         cell->push_back(MathAtom(new RefInset));
 860                         char c = getChar();
 861                         if (c == '[')
 862                                 parse_into(cell->back()->cell(1), FLAG_BRACK_END, mathmode);
 863                         else
 864                                 putback();
 865                         parse_into(cell->back()->cell(0), FLAG_ITEM, mathmode);
 866                 }
 867
 868                 else if (t.cs() == "left") {
 869                         string l = getToken().asString();
 870                         MathArray ar;
 871                         parse_into(ar, FLAG_RIGHT, mathmode);
 872                         string r = getToken().asString();
 873                         cell->push_back(MathAtom(new MathDelimInset(l, r, ar)));
 874                 }
 875
 876                 else if (t.cs() == "right") {
 877                         if (flags & FLAG_RIGHT)
 878                                 return;
 879                         //lyxerr << "got so far: '" << cell << "'\n";
 880                         error("Unmatched right delimiter");
 881                         return;
 882                 }
 883
 884                 else if (t.cs() == "begin") {
 885                         string const name = getArg('{', '}');
 886                         if (name == "array" || name == "subarray") {
 887                                 string const valign = getArg('[', ']') + 'c';
 888                                 string const halign = getArg('{', '}');
 889                                 cell->push_back(MathAtom(new MathArrayInset(name, valign[0], halign)));
 890                                 parse_into2(cell->back(), FLAG_END, mathmode, false);
 891                         }
 892
 893                         else if (name == "split" || name == "cases" ||
 894                                          name == "gathered" || name == "aligned") {
 895                                 cell->push_back(createMathInset(name));
 896                                 parse_into2(cell->back(), FLAG_END, mathmode, false);
 897                         }
 898
 899                         else if (name == "math") {
 900                                 cell->push_back(MathAtom(new MathHullInset(LM_OT_SIMPLE)));
 901                                 parse_into2(cell->back(), FLAG_SIMPLE, true, true);
 902                         }
 903
 904                         else if (name == "equation" || name == "equation*"
 905                                         || name == "displaymath") {
 906                                 cell->push_back(MathAtom(new MathHullInset(LM_OT_EQUATION)));
 907                                 parse_into2(cell->back(), FLAG_END, true, (name == "equation"));
 908                         }
 909
 910                         else if (name == "eqnarray" || name == "eqnarray*") {
 911                                 cell->push_back(MathAtom(new MathHullInset(LM_OT_EQNARRAY)));
 912                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 913                         }
 914
 915                         else if (name == "align" || name == "align*") {
 916                                 cell->push_back(MathAtom(new MathHullInset(LM_OT_ALIGN)));
 917                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 918                         }
 919
 920                         else if (name == "alignat" || name == "alignat*") {
 921                                 // ignore this for a while
 922                                 getArg('{', '}');
 923                                 cell->push_back(MathAtom(new MathHullInset(LM_OT_ALIGNAT)));
 924                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 925                         }
 926
 927                         else if (name == "xalignat" || name == "xalignat*") {
 928                                 // ignore this for a while
 929                                 getArg('{', '}');
 930                                 cell->push_back(MathAtom(new MathHullInset(LM_OT_XALIGNAT)));
 931                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 932                         }
 933
 934                         else if (name == "xxalignat") {
 935                                 // ignore this for a while
 936                                 getArg('{', '}');
 937                                 cell->push_back(MathAtom(new MathHullInset(LM_OT_XXALIGNAT)));
 938                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 939                         }
 940
 941                         else if (name == "multline" || name == "multline*") {
 942                                 cell->push_back(MathAtom(new MathHullInset(LM_OT_MULTLINE)));
 943                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 944                         }
 945
 946                         else if (name == "gather" || name == "gather*") {
 947                                 cell->push_back(MathAtom(new MathHullInset(LM_OT_GATHER)));
 948                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 949                         }
 950
 951                         else {
 952                                 latexkeys const * l = in_word_set(name);
 953                                 if (l) {
 954                                         if (l->inset == "matrix") {
 955                                                 cell->push_back(createMathInset(name));
 956                                                 parse_into2(cell->back(), FLAG_END, mathmode, false);
 957                                         }
 958                                 } else {
 959                                         lyxerr << "unknow math inset begin '" << name << "'\n";
 960                                 }
 961                         }
 962                 }
 963
 964                 else if (t.cs() == "kern") {
 965 #ifdef WITH_WARNINGS
 966 #warning A hack...
 967 #endif
 968                         string s;
 969                         while (1) {
 970                                 Token const & t = getToken();
 971                                 if (!good()) {
 972                                         putback();
 973                                         break;
 974                                 }
 975                                 s += t.character();
 976                                 if (isValidLength(s))
 977                                         break;
 978                         }
 979                         cell->push_back(MathAtom(new MathKernInset(s)));
 980                 }
 981
 982                 else if (t.cs() == "label") {
 983                         if (grid.asHullInset())
 984                                 grid.asHullInset()->label(cellrow, getArg('{', '}'));
 985                 }
 986
 987                 else if (t.cs() == "choose" || t.cs() == "over" || t.cs() == "atop") {
 988                         MathAtom p = createMathInset(t.cs());
 989                         cell->swap(p->cell(0));
 990                         parse_into(p->cell(1), flags, mathmode);
 991                         cell->push_back(p);
 992                         return;
 993                 }
 994
 995                 else if (t.cs() == "substack") {
 996                         cell->push_back(createMathInset(t.cs()));
 997                         parse_into2(cell->back(), FLAG_ITEM, mathmode, false);
 998                 }
 999
1000                 else if (t.cs() == "xymatrix") {
1001                         cell->push_back(createMathInset(t.cs()));
1002                         parse_into2(cell->back(), FLAG_ITEM, mathmode, false);
1003                 }
1004
1005 #if 0
1006                 // Disabled
1007                 else if (1 && t.cs() == "ar") {
1008                         MathXYArrowInset * p = new MathXYArrowInset;
1009
1010                         // try to read target
1011                         char c = getChar();
1012                         if (c == '[') {
1013                                 parse_into(p->cell(0), FLAG_BRACK_END, mathmode);
1014                                 //lyxerr << "read target: " << p->cell(0) << "\n";
1015                         } else {
1016                                 putback();
1017                         }
1018
1019                         // try to read label
1020                         if (nextToken().cat() == catSuper || nextToken().cat() == catSub) {
1021                                 p->up_ = nextToken().cat() == catSuper;
1022                                 getToken();
1023                                 parse_into(p->cell(1), FLAG_ITEM, mathmode);
1024                                 //lyxerr << "read label: " << p->cell(1) << "\n";
1025                         }
1026
1027                         cell->push_back(MathAtom(p));
1028                         //lyxerr << "read cell: " << cell << "\n";
1029                 }
1030 #endif
1031
1032                 else if (t.cs().size()) {
1033                         latexkeys const * l = in_word_set(t.cs());
1034                         if (l) {
1035                                 if (l->inset == "font") {
1036                                         lyxerr << "starting font " << t.cs() << "\n";
1037                                         MathAtom p = createMathInset(t.cs());
1038                                         bool textmode = (t.cs()[0] == 't');
1039                                         parse_into(p->cell(0), FLAG_ITEM, !textmode);
1040                                         cell->push_back(p);
1041                                         //lyxerr << "ending font\n";
1042                                 }
1043
1044                                 else if (l->inset == "oldfont") {
1045                                         cell->push_back(createMathInset(t.cs()));
1046                                         parse_into(cell->back()->cell(0), flags, l->extra == "mathmode");
1047                                         return;
1048                                 }
1049
1050                                 else if (l->inset == "box") {
1051                                         // switch to text mode
1052                                         cell->push_back(createMathInset(t.cs()));
1053                                         parse_into(cell->back()->cell(0), FLAG_ITEM, mathmode);
1054                                 }
1055
1056                                 else if (l->inset == "style") {
1057                                         cell->push_back(createMathInset(t.cs()));
1058                                         parse_into(cell->back()->cell(0), flags, mathmode);
1059                                         return;
1060                                 }
1061
1062                                 else {
1063                                         MathAtom p = createMathInset(t.cs());
1064                                         for (MathInset::idx_type i = 0; i < p->nargs(); ++i)
1065                                                 parse_into(p->cell(i), FLAG_ITEM, l->extra == "mathmode");
1066                                         cell->push_back(p);
1067                                 }
1068                         }
1069
1070                         else {
1071                                 MathAtom p = createMathInset(t.cs());
1072                                 for (MathInset::idx_type i = 0; i < p->nargs(); ++i)
1073                                         parse_into(p->cell(i), FLAG_ITEM, mathmode);
1074                                 cell->push_back(p);
1075                         }
1076                 }
1077
1078
1079                 if (flags & FLAG_LEAVE) {
1080                         flags &= ~FLAG_LEAVE;
1081                         break;
1082                 }
1083         }
1084 }
1085
1086
1087
1088 } // anonymous namespace
1089
1090
1091 void mathed_parse_cell(MathArray & ar, string const & str)
1092 {
1093         istringstream is(str.c_str());
1094         mathed_parse_cell(ar, is);
1095 }
1096
1097
1098 void mathed_parse_cell(MathArray & ar, istream & is)
1099 {
1100         Parser(is).parse_into(ar, 0, true);
1101 }
1102
1103
1104
1105 bool mathed_parse_macro(string & name, string const & str)
1106 {
1107         istringstream is(str.c_str());
1108         Parser parser(is);
1109         return parser.parse_macro(name);
1110 }
1111
1112 bool mathed_parse_macro(string & name, istream & is)
1113 {
1114         Parser parser(is);
1115         return parser.parse_macro(name);
1116 }
1117
1118 bool mathed_parse_macro(string & name, LyXLex & lex)
1119 {
1120         Parser parser(lex);
1121         return parser.parse_macro(name);
1122 }
1123
1124
1125
1126 bool mathed_parse_normal(MathAtom & t, string const & str)
1127 {
1128         istringstream is(str.c_str());
1129         Parser parser(is);
1130         return parser.parse_normal(t);
1131 }
1132
1133 bool mathed_parse_normal(MathAtom & t, istream & is)
1134 {
1135         Parser parser(is);
1136         return parser.parse_normal(t);
1137 }
1138
1139 bool mathed_parse_normal(MathAtom & t, LyXLex & lex)
1140 {
1141         Parser parser(lex);
1142         return parser.parse_normal(t);
1143 }