src/mathed/math_parser.C

   1 /*
   2  *  File:        math_parser.C
   3  *  Purpose:     Parser for mathed
   4  *  Author:      Alejandro Aguilar Sierra <asierra@servidor.unam.mx>
   5  *  Created:     January 1996
   6  *  Description: Parse LaTeX2e math mode code.
   7  *
   8  *  Dependencies: Xlib, XForms
   9  *
  10  *  Copyright: 1996, Alejandro Aguilar Sierra
  11  *
  12  *   Version: 0.8beta.
  13  *
  14  *   You are free to use and modify this code under the terms of
  15  *   the GNU General Public Licence version 2 or later.
  16  */
  17
  18 #include <config.h>
  19
  20 #include <cctype>
  21
  22 #ifdef __GNUG__
  23 #pragma implementation
  24 #endif
  25
  26 #include "math_parser.h"
  27 #include "array.h"
  28 #include "math_inset.h"
  29 #include "math_arrayinset.h"
  30 #include "math_charinset.h"
  31 #include "math_deliminset.h"
  32 #include "math_factory.h"
  33 #include "math_funcinset.h"
  34 #include "math_macro.h"
  35 #include "math_macrotable.h"
  36 #include "math_macrotemplate.h"
  37 #include "math_matrixinset.h"
  38 #include "math_rootinset.h"
  39 #include "math_scopeinset.h"
  40 #include "math_sqrtinset.h"
  41 #include "math_scriptinset.h"
  42 #include "math_sqrtinset.h"
  43 #include "debug.h"
  44 #include "support.h"
  45 #include "lyxlex.h"
  46 #include "support/lstrings.h"
  47
  48 using std::istream;
  49 using std::endl;
  50
  51
  52 namespace {
  53
  54 bool stared(string const & s)
  55 {
  56         unsigned n = s.size();
  57         return n && s[n - 1] == '*';
  58 }
  59
  60 MathScriptInset * prevScriptInset(MathArray const & array)
  61 {
  62         MathInset * p = array.back();
  63         return (p && p->isScriptInset()) ? static_cast<MathScriptInset *>(p) : 0;
  64 }
  65
  66
  67 MathInset * lastScriptInset(MathArray & array, bool up, int limits)
  68 {
  69         MathScriptInset * p = prevScriptInset(array);
  70         if (!p) {
  71                 MathInset * b = array.back();
  72                 if (b && b->isScriptable()) {
  73                         p = new MathScriptInset(up, !up, b->clone());
  74                         array.pop_back();
  75                 } else {
  76                         p = new MathScriptInset(up, !up);
  77                 }
  78                 array.push_back(p);
  79         }
  80         if (up)
  81                 p->up(true);
  82         else
  83                 p->down(true);
  84         if (limits)
  85                 p->limits(limits);
  86         return p;
  87 }
  88
  89
  90 // These are TeX's catcodes
  91 enum CatCode {
  92         catEscape,     // 0    backslash
  93         catBegin,      // 1    {
  94         catEnd,        // 2    }
  95         catMath,       // 3    $
  96         catAlign,      // 4    &
  97         catNewline,    // 5    ^^M
  98         catParameter,  // 6    #
  99         catSuper,      // 7    ^
 100         catSub,        // 8    _
 101         catIgnore,     // 9
 102         catSpace,      // 10   space
 103         catLetter,     // 11   a-zA-Z
 104         catOther,      // 12   none of the above
 105         catActive,     // 13   ~
 106         catComment,    // 14   %
 107         catInvalid     // 15   <delete>
 108 };
 109
 110 CatCode theCatcode[256];
 111
 112
 113 inline CatCode catcode(unsigned char c)
 114 {
 115         return theCatcode[c];
 116 }
 117
 118
 119 const unsigned char LM_TK_OPEN  = '{';
 120 const unsigned char LM_TK_CLOSE = '}';
 121
 122 enum {
 123         FLAG_BRACE      = 1 << 0,  //  an opening brace needed
 124         FLAG_BRACE_LAST = 1 << 1,  //  last closing brace ends the parsing process
 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 process
 128         FLAG_NEWLINE    = 1 << 6,  //  next \\\\ ends the parsing process
 129         FLAG_ITEM       = 1 << 7,  //  read a (possibly braced token)
 130         FLAG_BLOCK      = 1 << 8,  //  next block ends the parsing process
 131         FLAG_LEAVE      = 1 << 9,  //  leave the loop at the end
 132 };
 133
 134
 135 void catInit()
 136 {
 137         for (int i = 0; i <= 255; ++i)
 138                 theCatcode[i] = catOther;
 139         for (int i = 'a'; i <= 'z'; ++i)
 140                 theCatcode[i] = catLetter;
 141         for (int i = 'A'; i <= 'Z'; ++i)
 142                 theCatcode[i] = catLetter;
 143
 144         theCatcode['\\'] = catEscape;
 145         theCatcode['{']  = catBegin;
 146         theCatcode['}']  = catEnd;
 147         theCatcode['$']  = catMath;
 148         theCatcode['&']  = catAlign;
 149         theCatcode['\n'] = catNewline;
 150         theCatcode['#']  = catParameter;
 151         theCatcode['^']  = catSuper;
 152         theCatcode['_']  = catSub;
 153         theCatcode['\7f'] = catIgnore;
 154         theCatcode[' ']  = catSpace;
 155         theCatcode['\t'] = catSpace;
 156         theCatcode['\r'] = catSpace;
 157         theCatcode['~']  = catActive;
 158         theCatcode['%']  = catComment;
 159 }
 160
 161
 162
 163 //
 164 // Helper class for parsing
 165 //
 166
 167 class Token {
 168 public:
 169         ///
 170         Token() : cs_(), char_(0), cat_(catIgnore) {}
 171         ///
 172         Token(char c, CatCode cat) : cs_(), char_(c), cat_(cat) {}
 173         ///
 174         Token(const string & cs) : cs_(cs), char_(0), cat_(catIgnore) {}
 175
 176         ///
 177         bool operator==(Token const & t) const;
 178         ///
 179         bool operator!=(Token const & t) const;
 180         ///
 181         string const & cs() const { return cs_; }
 182         ///
 183         CatCode cat() const { return cat_; }
 184         ///
 185         char character() const { return char_; }
 186         ///
 187         string asString() const;
 188
 189 private:
 190         ///
 191         string cs_;
 192         ///
 193         char char_;
 194         ///
 195         CatCode cat_;
 196 };
 197
 198 string Token::asString() const
 199 {
 200         return cs_.size() ? cs_ : string(1, char_);
 201 }
 202
 203 bool Token::operator==(Token const & t) const
 204 {
 205         return char_ == t.char_ && cat_ == t.cat_ && cs_ == t.cs_;
 206 }
 207
 208 bool Token::operator!=(Token const & t) const
 209 {
 210         return char_ != t.char_ && cat_ != t.cat_ && cs_ != t.cs_;
 211 }
 212
 213 ostream & operator<<(ostream & os, Token const & t)
 214 {
 215         if (t.cs().size())
 216                 os << "\\" << t.cs();
 217         else
 218                 os << "[" << t.character() << "," << t.cat() << "]";
 219         return os;
 220 }
 221
 222
 223 class Parser {
 224
 225 public:
 226         ///
 227         Parser(LyXLex & lex);
 228         ///
 229         Parser(istream & is);
 230
 231         ///
 232         MathMacroTemplate * parse_macro();
 233         ///
 234         MathMatrixInset * parse_normal();
 235         ///
 236         void parse_into(MathArray & array, unsigned flags);
 237         ///
 238         int lineno() const { return lineno_; }
 239         ///
 240         void putback();
 241
 242 private:
 243         ///
 244         string getArg(char lf, char rf);
 245         ///
 246         char getChar();
 247         ///
 248         void error(string const & msg);
 249         ///
 250         void parse_lines(MathGridInset * p, bool numbered, bool outmost);
 251         ///
 252         latexkeys const * read_delim();
 253
 254 private:
 255         ///
 256         void tokenize(istream & is);
 257         ///
 258         void tokenize(string const & s);
 259         ///
 260         void push_back(Token const & t);
 261         ///
 262         void pop_back();
 263         ///
 264         Token const & prevToken() const;
 265         ///
 266         Token const & nextToken() const;
 267         ///
 268         Token const & getToken();
 269         ///
 270         void lex(string const & s);
 271         ///
 272         bool good() const;
 273
 274         ///
 275         int lineno_;
 276         ///
 277         std::vector<Token> tokens_;
 278         ///
 279         unsigned pos_;
 280         ///
 281         bool   curr_num_;
 282         ///
 283         string curr_label_;
 284         ///
 285         string curr_skip_;
 286 };
 287
 288
 289 Parser::Parser(LyXLex & lexer)
 290         : lineno_(lexer.getLineNo()), pos_(0)
 291 {
 292         tokenize(lexer.getStream());
 293 }
 294
 295
 296 Parser::Parser(istream & is)
 297         : lineno_(0), pos_(0)
 298 {
 299         tokenize(is);
 300 }
 301
 302
 303 void Parser::push_back(Token const & t)
 304 {
 305         tokens_.push_back(t);
 306 }
 307
 308
 309 void Parser::pop_back()
 310 {
 311         tokens_.pop_back();
 312 }
 313
 314
 315 Token const & Parser::prevToken() const
 316 {
 317         static const Token dummy;
 318         return pos_ > 0 ? tokens_[pos_ - 1] : dummy;
 319 }
 320
 321
 322 Token const & Parser::nextToken() const
 323 {
 324         static const Token dummy;
 325         return good() ? tokens_[pos_] : dummy;
 326 }
 327
 328
 329 Token const & Parser::getToken()
 330 {
 331         static const Token dummy;
 332         return good() ? tokens_[pos_++] : dummy;
 333 }
 334
 335
 336 void Parser::putback()
 337 {
 338         --pos_;
 339 }
 340
 341
 342 bool Parser::good() const
 343 {
 344         return pos_ < tokens_.size();
 345 }
 346
 347
 348 char Parser::getChar()
 349 {
 350         if (!good())
 351                 lyxerr << "The input stream is not well..." << endl;
 352         return tokens_[pos_++].character();
 353 }
 354
 355
 356 string Parser::getArg(char lf, char rg)
 357 {
 358         string result;
 359         char c = getChar();
 360
 361         if (c != lf)
 362                 putback();
 363         else
 364                 while ((c = getChar()) != rg && good())
 365                         result += c;
 366
 367         return result;
 368 }
 369
 370
 371 void Parser::tokenize(istream & is)
 372 {
 373         // eat everything up to the next \end_inset or end of stream
 374         // and store it in s for further tokenization
 375         string s;
 376         char c;
 377         while (is.get(c)) {
 378                 s += c;
 379                 if (s.size() >= 10 && s.substr(s.size() - 10) == "\\end_inset") {
 380                         s = s.substr(0, s.size() - 10);
 381                         break;
 382                 }
 383         }
 384
 385         // tokenize buffer
 386         tokenize(s);
 387 }
 388
 389
 390 void Parser::tokenize(string const & buffer)
 391 {
 392         static bool init_done = false;
 393
 394         if (!init_done) {
 395                 catInit();
 396                 init_done = true;
 397         }
 398
 399         istringstream is(buffer, ios::in || ios::binary);
 400
 401         char c;
 402         while (is.get(c)) {
 403
 404                 switch (catcode(c)) {
 405                         case catNewline: {
 406                                 ++lineno_;
 407                                 is.get(c);
 408                                 if (catcode(c) == catNewline)
 409                                         ; //push_back(Token("par"));
 410                                 else {
 411                                         push_back(Token(' ', catSpace));
 412                                         is.putback(c);
 413                                 }
 414                                 break;
 415                         }
 416
 417                         case catComment: {
 418                                 while (is.get(c) && catcode(c) != catNewline)
 419                                         ;
 420                                 ++lineno_;
 421                                 break;
 422                         }
 423
 424                         case catEscape: {
 425                                 is.get(c);
 426                                 string s(1, c);
 427                                 if (catcode(c) == catLetter) {
 428                                         while (is.get(c) && catcode(c) == catLetter)
 429                                                 s += c;
 430                                         if (catcode(c) == catSpace)
 431                                                 while (is.get(c) && catcode(c) == catSpace)
 432                                                         ;
 433                                         is.putback(c);
 434                                 }
 435                                 push_back(Token(s));
 436                                 break;
 437                         }
 438
 439                         default:
 440                                 push_back(Token(c, catcode(c)));
 441                 }
 442         }
 443
 444         //lyxerr << "\nTokens: ";
 445         //for (unsigned i = 0; i < tokens_.size(); ++i)
 446         //      lyxerr << tokens_[i];
 447         //lyxerr << "\n";
 448 }
 449
 450
 451 void Parser::error(string const & msg)
 452 {
 453         lyxerr << "Line ~" << lineno_ << ": Math parse error: " << msg << endl;
 454 }
 455
 456
 457 void Parser::parse_lines(MathGridInset * p, bool numbered, bool outmost)
 458 {
 459         const int cols = p->ncols();
 460
 461         // save global variables
 462         bool   const saved_num   = curr_num_;
 463         string const saved_label = curr_label_;
 464
 465         for (int row = 0; true; ++row) {
 466                 // reset global variables
 467                 curr_num_   = numbered;
 468                 curr_label_.erase();
 469
 470                 // reading a row
 471                 for (int col = 0; col < cols; ++col) {
 472                         //lyxerr << "reading cell " << row << " " << col << "\n";
 473                         parse_into(p->cell(col + row * cols), FLAG_BLOCK);
 474
 475                         // no ampersand
 476                         if (prevToken().cat() != catAlign) {
 477                                 //lyxerr << "less cells read than normal in row/col: "
 478                                 //      << row << " " << col << "\n";
 479                                 break;
 480                         }
 481                 }
 482
 483                 if (outmost) {
 484                         MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
 485                         m->numbered(row, curr_num_);
 486                         m->label(row, curr_label_);
 487                         if (curr_skip_.size()) {
 488                                 m->vskip(LyXLength(curr_skip_), row);
 489                                 curr_skip_.erase();
 490                         }
 491                 }
 492
 493                 // no newline?
 494                 if (prevToken() != Token("\\")) {
 495                         //lyxerr << "no newline here\n";
 496                         break;
 497                 }
 498
 499                 p->appendRow();
 500         }
 501
 502         // restore "global" variables
 503         curr_num_   = saved_num;
 504         curr_label_ = saved_label;
 505 }
 506
 507
 508 MathMacroTemplate * Parser::parse_macro()
 509 {
 510         while (nextToken().cat() == catSpace)
 511                 getToken();
 512
 513         if (getToken().cs() != "newcommand") {
 514                 lyxerr << "\\newcommand expected\n";
 515                 return 0;
 516         }
 517
 518         if (getToken().cat() != catBegin) {
 519                 lyxerr << "'{' expected\n";
 520                 return 0;
 521         }
 522
 523         string name = getToken().cs();
 524
 525         if (getToken().cat() != catEnd) {
 526                 lyxerr << "'}' expected\n";
 527                 return 0;
 528         }
 529
 530         string arg  = getArg('[', ']');
 531         int    narg = arg.empty() ? 0 : atoi(arg.c_str());
 532         //lyxerr << "creating macro " << name << " with " << narg <<  "args\n";
 533         MathMacroTemplate * p = new MathMacroTemplate(name, narg);
 534         parse_into(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 535         return p;
 536 }
 537
 538
 539 MathMatrixInset * Parser::parse_normal()
 540 {
 541         Token const & t = getToken();
 542
 543         if (t.cat() == catMath || t.cs() == "(") {
 544                 MathMatrixInset * p = new MathMatrixInset(LM_OT_SIMPLE);
 545                 parse_into(p->cell(0), 0);
 546                 return p;
 547         }
 548
 549         if (!t.cs().size()) {
 550                 lyxerr << "start of math expected, got '" << t << "'\n";
 551                 return 0;
 552         }
 553
 554         string const & cs = t.cs();
 555
 556         if (cs == "[") {
 557                 curr_num_ = 0;
 558                 curr_label_.erase();
 559                 MathMatrixInset * p = new MathMatrixInset(LM_OT_EQUATION);
 560                 parse_into(p->cell(0), 0);
 561                 p->numbered(0, curr_num_);
 562                 p->label(0, curr_label_);
 563                 return p;
 564         }
 565
 566         if (cs != "begin") {
 567                 lyxerr << "'begin' of un-simple math expected, got '" << cs << "'\n";
 568                 return 0;
 569         }
 570
 571         string const name = getArg('{', '}');
 572
 573         if (name == "equation" || name == "equation*") {
 574                 curr_num_ = stared(name);
 575                 curr_label_.erase();
 576                 MathMatrixInset * p = new MathMatrixInset(LM_OT_EQUATION);
 577                 parse_into(p->cell(0), FLAG_END);
 578                 p->numbered(0, curr_num_);
 579                 p->label(0, curr_label_);
 580                 return p;
 581         }
 582
 583         if (name == "eqnarray" || name == "eqnarray*") {
 584                 MathMatrixInset * p = new MathMatrixInset(LM_OT_EQNARRAY);
 585                 parse_lines(p, stared(name), true);
 586                 return p;
 587         }
 588
 589         if (name == "align" || name == "align*") {
 590                 MathMatrixInset * p = new MathMatrixInset(LM_OT_ALIGN);
 591                 p->halign(getArg('{', '}'));
 592                 parse_lines(p, stared(name), true);
 593                 return p;
 594         }
 595
 596         if (name == "alignat" || name == "alignat*") {
 597                 MathMatrixInset * p = new MathMatrixInset(LM_OT_ALIGNAT);
 598                 p->halign(getArg('{', '}'));
 599                 parse_lines(p, stared(name), true);
 600                 return p;
 601         }
 602
 603         lyxerr[Debug::MATHED] << "1: unknown math environment: " << name << "\n";
 604         return 0;
 605 }
 606
 607
 608 latexkeys const * Parser::read_delim()
 609 {
 610         Token const & t = getToken();
 611         latexkeys const * l = in_word_set(t.asString());
 612         return l ? l : in_word_set(".");
 613 }
 614
 615
 616 void Parser::parse_into(MathArray & array, unsigned flags)
 617 {
 618         MathTextCodes yyvarcode = LM_TC_MIN;
 619
 620         bool panic  = false;
 621         int  limits = 0;
 622
 623         while (good()) {
 624                 Token const & t = getToken();
 625
 626                 lyxerr << "t: " << t << " flags: " << flags << "'\n";
 627                 //array.dump(lyxerr);
 628                 lyxerr << "\n";
 629
 630                 if (flags & FLAG_ITEM) {
 631                         flags &= ~FLAG_ITEM;
 632                         if (t.cat() == catBegin) {
 633                                 // skip the brace and collect everything to the next matching
 634                                 // closing brace
 635                                 flags |= FLAG_BRACE_LAST;
 636                                 continue;
 637                         } else {
 638                                 // handle only this single token, leave the loop if done
 639                                 flags |= FLAG_LEAVE;
 640                         }
 641                 }
 642
 643                 if (flags & FLAG_BRACE) {
 644                         if (t.cat() != catBegin) {
 645                                 error("Expected {. Maybe you forgot to enclose an argument in {}");
 646                                 panic = true;
 647                                 break;
 648                         } else {
 649                                 flags &= ~FLAG_BRACE;
 650                                 continue;
 651                         }
 652                 }
 653
 654                 if (flags & FLAG_BLOCK) {
 655                         if (t.cat() == catEnd || t.cat() == catAlign || t.cs() == "\\")
 656                                 return;
 657                         if (t.cs() == "end") {
 658                                 getArg('{', '}');
 659                                 return;
 660                         }
 661                 }
 662
 663                 //
 664                 // cat codes
 665                 //
 666                 if (t.cat() == catMath)
 667                         break;
 668
 669                 else if (t.cat() == catLetter)
 670                         array.push_back(new MathCharInset(t.character(), yyvarcode));
 671
 672                 else if (t.cat() == catSpace && yyvarcode == LM_TC_TEXTRM)
 673                         array.push_back(new MathCharInset(' ', yyvarcode));
 674
 675                 else if (t.cat() == catParameter) {
 676                         Token const & n = getToken();
 677                         MathMacroArgument * p = new MathMacroArgument(n.character() - '0');
 678                         array.push_back(p);
 679                 }
 680
 681                 else if (t.cat() == catBegin) {
 682                         //lyxerr << " creating ScopeInset\n";
 683                         array.push_back(new MathScopeInset);
 684                         parse_into(array.back()->cell(0), FLAG_BRACE_LAST);
 685                 }
 686
 687                 else if (t.cat() == catEnd) {
 688                         if (!(flags & FLAG_BRACE_LAST))
 689                                 lyxerr << " ##### unexpected end of block\n";
 690                         return;
 691                 }
 692
 693                 else if (t.cat() == catAlign) {
 694                         lyxerr << "found tab unexpectedly, array: '" << array << "'\n";
 695                         return;
 696                 }
 697
 698                 else if (t.cat() == catSuper)
 699                         parse_into(lastScriptInset(array, true, limits)->cell(0), FLAG_ITEM);
 700
 701                 else if (t.cat() == catSub)
 702                         parse_into(lastScriptInset(array, false, limits)->cell(1), FLAG_ITEM);
 703
 704                 else if (t.character() == ']' && (flags & FLAG_BRACK_END))
 705                         return;
 706
 707                 else if (t.cat() == catOther)
 708                         array.push_back(new MathCharInset(t.character(), yyvarcode));
 709
 710                 //
 711                 // codesequences
 712                 //
 713                 else if (t.cs() == "protect")
 714                         ;
 715
 716                 else if (t.cs() == "end")
 717                         break;
 718
 719                 else if (t.cs() == ")")
 720                         break;
 721
 722                 else if (t.cs() == "]")
 723                         break;
 724
 725                 else if (t.cs() == "\\") {
 726                         curr_skip_ = getArg('[', ']');
 727                         if (!(flags & FLAG_NEWLINE))
 728                                 lyxerr[Debug::MATHED]
 729                                         << "found newline unexpectedly, array: '" << array << "'\n";
 730                         return;
 731                 }
 732
 733                 else if (t.cs() == "limits")
 734                         limits = 1;
 735
 736                 else if (t.cs() == "nolimits")
 737                         limits = -1;
 738
 739                 else if (t.cs() == "nonumber")
 740                         curr_num_ = false;
 741
 742                 else if (t.cs() == "number")
 743                         curr_num_ = true;
 744
 745                 else if (t.cs() == "sqrt") {
 746                         char c = getChar();
 747                         if (c == '[') {
 748                                 array.push_back(new MathRootInset);
 749                                 parse_into(array.back()->cell(0), FLAG_BRACK_END);
 750                                 parse_into(array.back()->cell(1), FLAG_ITEM);
 751                         } else {
 752                                 putback();
 753                                 array.push_back(new MathSqrtInset);
 754                                 parse_into(array.back()->cell(0), FLAG_ITEM);
 755                         }
 756                 }
 757
 758                 else if (t.cs() == "left") {
 759                         latexkeys const * l = read_delim();
 760                         MathArray ar;
 761                         parse_into(ar, FLAG_RIGHT);
 762                         latexkeys const * r = read_delim();
 763                         MathDelimInset * dl = new MathDelimInset(l, r);
 764                         dl->cell(0) = ar;
 765                         array.push_back(dl);
 766                 }
 767
 768                 else if (t.cs() == "right") {
 769                         if (!(flags & FLAG_RIGHT))
 770                                 error("Unmatched right delimiter");
 771                         return;
 772                 }
 773
 774 /*
 775                 case LM_TK_STY:
 776                 {
 777                         lyxerr[Debug::MATHED] << "LM_TK_STY not implemented\n";
 778                         //MathArray tmp = array;
 779                         //MathSizeInset * p = new MathSizeInset(MathStyles(lval_->id));
 780                         //array.push_back(p);
 781                         //parse_into(p->cell(0), FLAG_BRACE_FONT);
 782                         break;
 783                 }
 784
 785                 case LM_TK_UNDEF:
 786                         if (MathMacroTable::hasTemplate(sval_)) {
 787                                 MathMacro * m = MathMacroTable::cloneTemplate(sval_);
 788                                 for (int i = 0; i < m->nargs(); ++i)
 789                                         parse_into(m->cell(i), FLAG_ITEM);
 790                                 array.push_back(m);
 791                                 m->metrics(LM_ST_TEXT);
 792                         } else
 793                                 array.push_back(new MathFuncInset(sval_));
 794                         break;
 795
 796                 else  LM_TK_SPECIAL:
 797                         array.push_back(new MathCharInset(ival_, LM_TC_SPECIAL));
 798                         break;
 799 */
 800
 801                 else if (t.cs() == "begin") {
 802                         string const name = getArg('{', '}');
 803                         if (name == "array") {
 804                                 string const valign = getArg('[', ']') + 'c';
 805                                 string const halign = getArg('{', '}');
 806                                 MathArrayInset * m = new MathArrayInset(halign.size(), 1);
 807                                 m->valign(valign[0]);
 808                                 m->halign(halign);
 809                                 parse_lines(m, false, false);
 810                                 array.push_back(m);
 811                         } else
 812                                 lyxerr[Debug::MATHED] << "unknow math inset begin '" << name << "'\n";
 813                 }
 814
 815                 else if (t.cs() == "label") {
 816                         MathArray ar;
 817                         parse_into(ar, FLAG_ITEM);
 818                         ostringstream os;
 819                         ar.write(os, true);
 820                         curr_label_ = os.str();
 821                         // was:
 822                         //curr_label_ = getArg('{', '}');
 823                 }
 824
 825                 else if (t.cs() == "choose" || t.cs() == "over") {
 826                         limits = 0;
 827                         MathInset * p = createMathInset(t.cs());
 828                         p->cell(0).swap(array);
 829                         array.push_back(p);
 830                         parse_into(p->cell(1), FLAG_BLOCK);
 831                 }
 832
 833                 else if (t.cs().size()) {
 834                         limits = 0;
 835                         latexkeys const * l = in_word_set(t.cs());
 836                         if (l) {
 837                                 if (l->token == LM_TK_FONT) {
 838                                         //lyxerr << "starting font\n";
 839                                         MathArray ar;
 840                                         parse_into(ar, FLAG_ITEM);
 841                                         for (MathArray::iterator it = ar.begin(); it != ar.end(); ++it)
 842                                                 (*it)->handleFont(static_cast<MathTextCodes>(l->id));
 843                                         array.push_back(ar);
 844                                         //lyxerr << "ending font\n";
 845                                 }
 846
 847                                 else if (l->token == LM_TK_OLDFONT)
 848                                         yyvarcode = static_cast<MathTextCodes>(l->id);
 849
 850                                 else {
 851                                         MathInset * p = createMathInset(t.cs());
 852                                         for (int i = 0; i < p->nargs(); ++i)
 853                                                 parse_into(p->cell(i), FLAG_ITEM);
 854                                         array.push_back(p);
 855                                 }
 856                         }
 857
 858                         else {
 859                                 MathInset * p = createMathInset(t.cs());
 860                                 if (p) {
 861                                         for (int i = 0; i < p->nargs(); ++i)
 862                                                 parse_into(p->cell(i), FLAG_ITEM);
 863                                         array.push_back(p);
 864                                 } else {
 865                                         error("Unrecognized token");
 866                                         //lyxerr[Debug::MATHED] << "[" << t << "]\n";
 867                                         lyxerr << t << "\n";
 868                                 }
 869                         }
 870                 }
 871
 872
 873                 if (flags & FLAG_LEAVE) {
 874                         flags &= ~FLAG_LEAVE;
 875                         break;
 876                 }
 877         }
 878
 879         if (panic) {
 880                 lyxerr << " Math Panic, expect problems!\n";
 881                 //   Search for the end command.
 882                 Token t;
 883                 do {
 884                         t = getToken();
 885                 } while (good() && t.cs() != "end");
 886         }
 887 }
 888
 889 } // anonymous namespace
 890
 891
 892
 893 MathArray mathed_parse_cell(string const & str)
 894 {
 895         istringstream is(str.c_str());
 896         Parser parser(is);
 897         MathArray ar;
 898         parser.parse_into(ar, 0);
 899         return ar;
 900 }
 901
 902
 903
 904 MathMacroTemplate * mathed_parse_macro(string const & str)
 905 {
 906         istringstream is(str.c_str());
 907         Parser parser(is);
 908         return parser.parse_macro();
 909 }
 910
 911 MathMacroTemplate * mathed_parse_macro(istream & is)
 912 {
 913         Parser parser(is);
 914         return parser.parse_macro();
 915 }
 916
 917 MathMacroTemplate * mathed_parse_macro(LyXLex & lex)
 918 {
 919         Parser parser(lex);
 920         return parser.parse_macro();
 921 }
 922
 923
 924
 925 MathMatrixInset * mathed_parse_normal(string const & str)
 926 {
 927         istringstream is(str.c_str());
 928         Parser parser(is);
 929         return parser.parse_normal();
 930 }
 931
 932 MathMatrixInset * mathed_parse_normal(istream & is)
 933 {
 934         Parser parser(is);
 935         return parser.parse_normal();
 936 }
 937
 938 MathMatrixInset * mathed_parse_normal(LyXLex & lex)
 939 {
 940         Parser parser(lex);
 941         return parser.parse_normal();
 942 }