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                 if (at->nargs() > 0)
 586                         at->cell(0) = ar;
 587                 else
 588                         lyxerr << "Unusual contents found: " << ar << endl;
 589                 return true;
 590         }
 591         at = ar[0];
 592         return true;
 593 }
 594
 595
 596 void Parser::parse_into(MathArray & array, unsigned flags, bool mathmode)
 597 {
 598         MathGridInset grid(1, 1);
 599         parse_into1(grid, flags, mathmode, false);
 600         array = grid.cell(0);
 601 }
 602
 603
 604 void Parser::parse_into2(MathAtom & at, unsigned flags,
 605         bool mathmode, bool numbered)
 606 {
 607         parse_into1(*(at->asGridInset()), flags, mathmode, numbered);
 608 }
 609
 610
 611 void Parser::parse_into1(MathGridInset & grid, unsigned flags,
 612         bool mathmode, bool numbered)
 613 {
 614         int  limits = 0;
 615         MathGridInset::row_type cellrow = 0;
 616         MathGridInset::col_type cellcol = 0;
 617         MathArray * cell = &grid.cell(grid.index(cellrow, cellcol));
 618
 619         if (grid.asHullInset())
 620                 grid.asHullInset()->numbered(cellrow, numbered);
 621
 622         //dump();
 623         //lyxerr << "grid: " << grid << endl;
 624
 625         while (good()) {
 626                 Token const & t = getToken();
 627
 628 #ifdef FILEDEBUG
 629                 lyxerr << "t: " << t << " flags: " << flags << "\n";
 630                 //cell->dump();
 631                 lyxerr << "\n";
 632 #endif
 633
 634                 if (flags & FLAG_ITEM) {
 635                         if (t.cat() == catSpace)
 636                                 continue;
 637
 638                         flags &= ~FLAG_ITEM;
 639                         if (t.cat() == catBegin) {
 640                                 // skip the brace and collect everything to the next matching
 641                                 // closing brace
 642                                 flags |= FLAG_BRACE_LAST;
 643                                 continue;
 644                         }
 645
 646                         // handle only this single token, leave the loop if done
 647                         flags |= FLAG_LEAVE;
 648                 }
 649
 650                 //
 651                 // cat codes
 652                 //
 653                 if (t.cat() == catMath) {
 654                         if (!mathmode) {
 655                                 // we are inside some text mode thingy, so opening new math is allowed
 656                                 Token const & n = getToken();
 657                                 if (n.cat() == catMath) {
 658                                         // TeX's $$...$$ syntax for displayed math
 659                                         cell->push_back(MathAtom(new MathHullInset("equation")));
 660                                         parse_into2(cell->back(), FLAG_SIMPLE, true, false);
 661                                         getToken(); // skip the second '$' token
 662                                 } else {
 663                                         // simple $...$  stuff
 664                                         putback();
 665                                         cell->push_back(MathAtom(new MathHullInset("simple")));
 666                                         parse_into2(cell->back(), FLAG_SIMPLE, true, false);
 667                                 }
 668                         }
 669
 670                         else if (flags & FLAG_SIMPLE) {
 671                                 // this is the end of the formula
 672                                 return;
 673                         }
 674
 675                         else {
 676                                 error("something strange in the parser\n");
 677                                 break;
 678                         }
 679                 }
 680
 681                 else if (t.cat() == catLetter)
 682                         cell->push_back(MathAtom(new MathCharInset(t.character())));
 683
 684                 else if (t.cat() == catSpace && !mathmode)
 685                         cell->push_back(MathAtom(new MathCharInset(t.character())));
 686
 687                 else if (t.cat() == catParameter) {
 688                         Token const & n = getToken();
 689                         cell->push_back(MathAtom(new MathMacroArgument(n.character()-'0')));
 690                 }
 691
 692                 else if (t.cat() == catBegin) {
 693                         MathArray ar;
 694                         parse_into(ar, FLAG_BRACE_LAST, mathmode);
 695                         // reduce multiple nesting levels to a single one
 696                         // this helps to keep the annoyance of  "a choose b"  to a minimum
 697                         if (ar.size() && ar.front()->asBraceInset())
 698                                 ar = ar.front()->asBraceInset()->cell(0);
 699                         cell->push_back(MathAtom(new MathBraceInset));
 700                         cell->back()->cell(0).swap(ar);
 701                 }
 702
 703                 else if (t.cat() == catEnd) {
 704                         if (flags & FLAG_BRACE_LAST)
 705                                 return;
 706                         error("found '}' unexpectedly");
 707                         //lyx::Assert(0);
 708                         //add(cell, '}', LM_TC_TEX);
 709                 }
 710
 711                 else if (t.cat() == catAlign) {
 712                         ++cellcol;
 713                         //lyxerr << " column now " << cellcol << " max: " << grid.ncols() << "\n";
 714                         if (cellcol == grid.ncols()) {
 715                                 lyxerr << "adding column " << cellcol << "\n";
 716                                 grid.addCol(cellcol - 1);
 717                         }
 718                         cell = &grid.cell(grid.index(cellrow, cellcol));
 719                 }
 720
 721                 else if (t.cat() == catSuper || t.cat() == catSub) {
 722                         bool up = (t.cat() == catSuper);
 723                         MathScriptInset * p = 0;
 724                         if (cell->size())
 725                                 p = cell->back()->asScriptInset();
 726                         if (!p || p->has(up)) {
 727                                 cell->push_back(MathAtom(new MathScriptInset(up)));
 728                                 p = cell->back()->asScriptInset();
 729                         }
 730                         p->ensure(up);
 731                         parse_into(p->cell(up), FLAG_ITEM, mathmode);
 732                         p->limits(limits);
 733                         limits = 0;
 734                 }
 735
 736                 else if (t.character() == ']' && (flags & FLAG_BRACK_END))
 737                         return;
 738
 739                 else if (t.cat() == catOther)
 740                         cell->push_back(MathAtom(new MathCharInset(t.character())));
 741
 742                 //
 743                 // control sequences
 744                 //
 745                 else if (t.cs() == "(") {
 746                         cell->push_back(MathAtom(new MathHullInset("simple")));
 747                         parse_into2(cell->back(), FLAG_SIMPLE2, true, false);
 748                 }
 749
 750                 else if (t.cs() == "[") {
 751                         cell->push_back(MathAtom(new MathHullInset("equation")));
 752                         parse_into2(cell->back(), FLAG_EQUATION, true, false);
 753                 }
 754
 755                 else if (t.cs() == "protect")
 756                         // ignore \\protect, will hopefully be re-added during output
 757                         ;
 758
 759                 else if (t.cs() == "end") {
 760                         if (flags & FLAG_END) {
 761                                 // eat environment name
 762                                 //string const name =
 763                                 getArg('{', '}');
 764                                 // FIXME: check that we ended the correct environment
 765                                 return;
 766                         }
 767                         error("found 'end' unexpectedly");
 768                 }
 769
 770                 else if (t.cs() == ")") {
 771                         if (flags & FLAG_SIMPLE2)
 772                                 return;
 773                         error("found '\\)' unexpectedly");
 774                 }
 775
 776                 else if (t.cs() == "]") {
 777                         if (flags & FLAG_EQUATION)
 778                                 return;
 779                         error("found '\\]' unexpectedly");
 780                 }
 781
 782                 else if (t.cs() == "\\") {
 783                         grid.vcrskip(LyXLength(getArg('[', ']')), cellrow);
 784                         ++cellrow;
 785                         cellcol = 0;
 786                         if (cellrow == grid.nrows())
 787                                 grid.addRow(cellrow - 1);
 788                         if (grid.asHullInset())
 789                                 grid.asHullInset()->numbered(cellrow, numbered);
 790                         cell = &grid.cell(grid.index(cellrow, cellcol));
 791                 }
 792
 793 #if 1
 794                 else if (t.cs() == "multicolumn") {
 795                         // extract column count and insert dummy cells
 796                         MathArray count;
 797                         parse_into(count, FLAG_ITEM, mathmode);
 798                         int cols = 1;
 799                         if (!extractNumber(count, cols)) {
 800                                 lyxerr << " can't extract number of cells from " << count << "\n";
 801                         }
 802                         // resize the table if necessary
 803                         for (int i = 0; i < cols; ++i) {
 804                                 ++cellcol;
 805                                 if (cellcol == grid.ncols()) {
 806                                         lyxerr << "adding column " << cellcol << "\n";
 807                                         grid.addCol(cellcol - 1);
 808                                 }
 809                                 cell = &grid.cell(grid.index(cellrow, cellcol));
 810                                 // mark this as dummy
 811                                 grid.cellinfo(grid.index(cellrow, cellcol)).dummy_ = true;
 812                         }
 813                         // the last cell is the real thng, not a dummy
 814                         grid.cellinfo(grid.index(cellrow, cellcol)).dummy_ = false;
 815
 816                         // read special alignment
 817                         MathArray align;
 818                         parse_into(align, FLAG_ITEM, mathmode);
 819                         //grid.cellinfo(grid.index(cellrow, cellcol)).align_ = extractString(align);
 820
 821                         // parse the remaining contents into the "real" cell
 822                         parse_into(*cell, FLAG_ITEM, mathmode);
 823                 }
 824 #endif
 825
 826                 else if (t.cs() == "limits")
 827                         limits = 1;
 828
 829                 else if (t.cs() == "nolimits")
 830                         limits = -1;
 831
 832                 else if (t.cs() == "nonumber") {
 833                         if (grid.asHullInset())
 834                                 grid.asHullInset()->numbered(cellrow, false);
 835                 }
 836
 837                 else if (t.cs() == "number") {
 838                         if (grid.asHullInset())
 839                                 grid.asHullInset()->numbered(cellrow, true);
 840                 }
 841
 842                 else if (t.cs() == "hline") {
 843                         if (grid.asHullInset())
 844                                 grid.asHullInset()->rowinfo(cellrow + 1);
 845                 }
 846
 847                 else if (t.cs() == "sqrt") {
 848                         char c = getChar();
 849                         if (c == '[') {
 850                                 cell->push_back(MathAtom(new MathRootInset));
 851                                 parse_into(cell->back()->cell(0), FLAG_BRACK_END, mathmode);
 852                                 parse_into(cell->back()->cell(1), FLAG_ITEM, mathmode);
 853                         } else {
 854                                 putback();
 855                                 cell->push_back(MathAtom(new MathSqrtInset));
 856                                 parse_into(cell->back()->cell(0), FLAG_ITEM, mathmode);
 857                         }
 858                 }
 859
 860                 else if (t.cs() == "ref") {
 861                         cell->push_back(MathAtom(new RefInset));
 862                         char c = getChar();
 863                         if (c == '[')
 864                                 parse_into(cell->back()->cell(1), FLAG_BRACK_END, mathmode);
 865                         else
 866                                 putback();
 867                         parse_into(cell->back()->cell(0), FLAG_ITEM, mathmode);
 868                 }
 869
 870                 else if (t.cs() == "left") {
 871                         string l = getToken().asString();
 872                         MathArray ar;
 873                         parse_into(ar, FLAG_RIGHT, mathmode);
 874                         string r = getToken().asString();
 875                         cell->push_back(MathAtom(new MathDelimInset(l, r, ar)));
 876                 }
 877
 878                 else if (t.cs() == "right") {
 879                         if (flags & FLAG_RIGHT)
 880                                 return;
 881                         //lyxerr << "got so far: '" << cell << "'\n";
 882                         error("Unmatched right delimiter");
 883                         return;
 884                 }
 885
 886                 else if (t.cs() == "begin") {
 887                         string const name = getArg('{', '}');
 888                         if (name == "array" || name == "subarray") {
 889                                 string const valign = getArg('[', ']') + 'c';
 890                                 string const halign = getArg('{', '}');
 891                                 cell->push_back(MathAtom(new MathArrayInset(name, valign[0], halign)));
 892                                 parse_into2(cell->back(), FLAG_END, mathmode, false);
 893                         }
 894
 895                         else if (name == "split" || name == "cases" ||
 896                                          name == "gathered" || name == "aligned") {
 897                                 cell->push_back(createMathInset(name));
 898                                 parse_into2(cell->back(), FLAG_END, mathmode, false);
 899                         }
 900
 901                         else if (name == "math") {
 902                                 cell->push_back(MathAtom(new MathHullInset("simple")));
 903                                 parse_into2(cell->back(), FLAG_SIMPLE, true, true);
 904                         }
 905
 906                         else if (name == "equation" || name == "equation*"
 907                                         || name == "displaymath") {
 908                                 cell->push_back(MathAtom(new MathHullInset("equation")));
 909                                 parse_into2(cell->back(), FLAG_END, true, (name == "equation"));
 910                         }
 911
 912                         else if (name == "eqnarray" || name == "eqnarray*") {
 913                                 cell->push_back(MathAtom(new MathHullInset("eqnarray")));
 914                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 915                         }
 916
 917                         else if (name == "align" || name == "align*") {
 918                                 cell->push_back(MathAtom(new MathHullInset("align")));
 919                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 920                         }
 921
 922                         else if (name == "alignat" || name == "alignat*") {
 923                                 // ignore this for a while
 924                                 getArg('{', '}');
 925                                 cell->push_back(MathAtom(new MathHullInset("alignat")));
 926                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 927                         }
 928
 929                         else if (name == "xalignat" || name == "xalignat*") {
 930                                 // ignore this for a while
 931                                 getArg('{', '}');
 932                                 cell->push_back(MathAtom(new MathHullInset("xalignat")));
 933                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 934                         }
 935
 936                         else if (name == "xxalignat") {
 937                                 // ignore this for a while
 938                                 getArg('{', '}');
 939                                 cell->push_back(MathAtom(new MathHullInset("xxalignat")));
 940                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 941                         }
 942
 943                         else if (name == "multline" || name == "multline*") {
 944                                 cell->push_back(MathAtom(new MathHullInset("multline")));
 945                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 946                         }
 947
 948                         else if (name == "gather" || name == "gather*") {
 949                                 cell->push_back(MathAtom(new MathHullInset("gather")));
 950                                 parse_into2(cell->back(), FLAG_END, true, !stared(name));
 951                         }
 952
 953                         else {
 954                                 latexkeys const * l = in_word_set(name);
 955                                 if (l) {
 956                                         if (l->inset == "matrix") {
 957                                                 cell->push_back(createMathInset(name));
 958                                                 parse_into2(cell->back(), FLAG_END, mathmode, false);
 959                                         }
 960                                 } else {
 961                                         lyxerr << "unknow math inset begin '" << name << "'\n";
 962                                 }
 963                         }
 964                 }
 965
 966                 else if (t.cs() == "kern") {
 967 #ifdef WITH_WARNINGS
 968 #warning A hack...
 969 #endif
 970                         string s;
 971                         while (1) {
 972                                 Token const & t = getToken();
 973                                 if (!good()) {
 974                                         putback();
 975                                         break;
 976                                 }
 977                                 s += t.character();
 978                                 if (isValidLength(s))
 979                                         break;
 980                         }
 981                         cell->push_back(MathAtom(new MathKernInset(s)));
 982                 }
 983
 984                 else if (t.cs() == "label") {
 985                         if (grid.asHullInset())
 986                                 grid.asHullInset()->label(cellrow, getArg('{', '}'));
 987                 }
 988
 989                 else if (t.cs() == "choose" || t.cs() == "over" || t.cs() == "atop") {
 990                         MathAtom p = createMathInset(t.cs());
 991                         cell->swap(p->cell(0));
 992                         parse_into(p->cell(1), flags, mathmode);
 993                         cell->push_back(p);
 994                         return;
 995                 }
 996
 997                 else if (t.cs() == "substack") {
 998                         cell->push_back(createMathInset(t.cs()));
 999                         parse_into2(cell->back(), FLAG_ITEM, mathmode, false);
1000                 }
1001
1002                 else if (t.cs() == "xymatrix") {
1003                         cell->push_back(createMathInset(t.cs()));
1004                         parse_into2(cell->back(), FLAG_ITEM, mathmode, false);
1005                 }
1006
1007 #if 0
1008                 // Disabled
1009                 else if (1 && t.cs() == "ar") {
1010                         MathXYArrowInset * p = new MathXYArrowInset;
1011
1012                         // try to read target
1013                         char c = getChar();
1014                         if (c == '[') {
1015                                 parse_into(p->cell(0), FLAG_BRACK_END, mathmode);
1016                                 //lyxerr << "read target: " << p->cell(0) << "\n";
1017                         } else {
1018                                 putback();
1019                         }
1020
1021                         // try to read label
1022                         if (nextToken().cat() == catSuper || nextToken().cat() == catSub) {
1023                                 p->up_ = nextToken().cat() == catSuper;
1024                                 getToken();
1025                                 parse_into(p->cell(1), FLAG_ITEM, mathmode);
1026                                 //lyxerr << "read label: " << p->cell(1) << "\n";
1027                         }
1028
1029                         cell->push_back(MathAtom(p));
1030                         //lyxerr << "read cell: " << cell << "\n";
1031                 }
1032 #endif
1033
1034                 else if (t.cs().size()) {
1035                         latexkeys const * l = in_word_set(t.cs());
1036                         if (l) {
1037                                 if (l->inset == "font") {
1038                                         lyxerr << "starting font " << t.cs() << "\n";
1039                                         MathAtom p = createMathInset(t.cs());
1040                                         bool textmode = (t.cs()[0] == 't');
1041                                         parse_into(p->cell(0), FLAG_ITEM, !textmode);
1042                                         cell->push_back(p);
1043                                         //lyxerr << "ending font\n";
1044                                 }
1045
1046                                 else if (l->inset == "oldfont") {
1047                                         cell->push_back(createMathInset(t.cs()));
1048                                         parse_into(cell->back()->cell(0), flags, l->extra == "mathmode");
1049                                         return;
1050                                 }
1051
1052                                 else if (l->inset == "box") {
1053                                         // switch to text mode
1054                                         cell->push_back(createMathInset(t.cs()));
1055                                         parse_into(cell->back()->cell(0), FLAG_ITEM, mathmode);
1056                                 }
1057
1058                                 else if (l->inset == "style") {
1059                                         cell->push_back(createMathInset(t.cs()));
1060                                         parse_into(cell->back()->cell(0), flags, mathmode);
1061                                         return;
1062                                 }
1063
1064                                 else {
1065                                         MathAtom p = createMathInset(t.cs());
1066                                         for (MathInset::idx_type i = 0; i < p->nargs(); ++i)
1067                                                 parse_into(p->cell(i), FLAG_ITEM, l->extra == "mathmode");
1068                                         cell->push_back(p);
1069                                 }
1070                         }
1071
1072                         else {
1073                                 MathAtom p = createMathInset(t.cs());
1074                                 for (MathInset::idx_type i = 0; i < p->nargs(); ++i)
1075                                         parse_into(p->cell(i), FLAG_ITEM, mathmode);
1076                                 cell->push_back(p);
1077                         }
1078                 }
1079
1080
1081                 if (flags & FLAG_LEAVE) {
1082                         flags &= ~FLAG_LEAVE;
1083                         break;
1084                 }
1085         }
1086 }
1087
1088
1089
1090 } // anonymous namespace
1091
1092
1093 void mathed_parse_cell(MathArray & ar, string const & str)
1094 {
1095         istringstream is(str.c_str());
1096         mathed_parse_cell(ar, is);
1097 }
1098
1099
1100 void mathed_parse_cell(MathArray & ar, istream & is)
1101 {
1102         Parser(is).parse_into(ar, 0, true);
1103 }
1104
1105
1106
1107 bool mathed_parse_macro(string & name, string const & str)
1108 {
1109         istringstream is(str.c_str());
1110         Parser parser(is);
1111         return parser.parse_macro(name);
1112 }
1113
1114 bool mathed_parse_macro(string & name, istream & is)
1115 {
1116         Parser parser(is);
1117         return parser.parse_macro(name);
1118 }
1119
1120 bool mathed_parse_macro(string & name, LyXLex & lex)
1121 {
1122         Parser parser(lex);
1123         return parser.parse_macro(name);
1124 }
1125
1126
1127
1128 bool mathed_parse_normal(MathAtom & t, string const & str)
1129 {
1130         istringstream is(str.c_str());
1131         Parser parser(is);
1132         return parser.parse_normal(t);
1133 }
1134
1135 bool mathed_parse_normal(MathAtom & t, istream & is)
1136 {
1137         Parser parser(is);
1138         return parser.parse_normal(t);
1139 }
1140
1141 bool mathed_parse_normal(MathAtom & t, LyXLex & lex)
1142 {
1143         Parser parser(lex);
1144         return parser.parse_normal(t);
1145 }