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