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_macro.h"
  30 #include "math_macrotable.h"
  31 #include "math_macrotemplate.h"
  32 #include "math_root.h"
  33 #include "math_arrayinset.h"
  34 #include "math_sqrtinset.h"
  35 #include "math_matrixinset.h"
  36 #include "math_accentinset.h"
  37 #include "math_bigopinset.h"
  38 #include "math_funcinset.h"
  39 #include "math_spaceinset.h"
  40 #include "math_sizeinset.h"
  41 #include "math_dotsinset.h"
  42 #include "math_fracinset.h"
  43 #include "math_deliminset.h"
  44 #include "math_decorationinset.h"
  45 #include "debug.h"
  46 #include "mathed/support.h"
  47 #include "lyxlex.h"
  48
  49 using std::istream;
  50 using std::endl;
  51
  52
  53
  54 // These are lexical codes, not semantic
  55 enum lexcode_enum {
  56         LexNone,
  57         LexESC,
  58         LexAlpha,
  59         LexDigit,
  60         LexBOP,         // Binary operators or relations
  61         LexMathSpace,
  62         LexOpen,
  63         LexClose,
  64         LexComment,
  65         LexArgument,
  66         LexSpace,
  67         LexNewLine,
  68         LexOther,
  69         LexSelf
  70 };
  71
  72 lexcode_enum lexcode[256];
  73
  74
  75
  76 char const * latex_special_chars = "#$%&_{}";
  77
  78
  79 /// Read TeX into data, flags give stop conditions
  80 void mathed_parse(MathArray & data, unsigned flags);
  81
  82
  83 namespace {
  84
  85 const char LM_TK_OPEN  = '{';
  86 const char LM_TK_CLOSE = '}';
  87
  88 enum {
  89         FLAG_BRACE      = 1 << 0,  //  A { needed              //}
  90         FLAG_BRACE_OPT  = 1 << 2,  //  Optional {
  91         FLAG_BRACE_LAST = 1 << 3,  //  Last } ends the parsing process
  92         FLAG_BRACK_ARG  = 1 << 4,  //  Optional [
  93         FLAG_RIGHT      = 1 << 5,  //  Next right ends the parsing process
  94         FLAG_END        = 1 << 6,  //  Next end ends the parsing process
  95         FLAG_BRACE_FONT = 1 << 7,  //  Next } closes a font
  96         FLAG_BRACK_END  = 1 << 9,  //  Next ] ends the parsing process
  97         FLAG_AMPERSAND  = 1 << 10, //  Next & ends the parsing process
  98         FLAG_NEWLINE    = 1 << 11  //  Next \\ ends the parsing process
  99 };
 100
 101
 102 ///
 103 union {
 104         ///
 105         int i;
 106         ///
 107         latexkeys const * l;
 108 } yylval;
 109
 110
 111 string yytext;
 112
 113 int yylineno;
 114 istream * yyis;
 115 bool yy_mtextmode = false;
 116
 117
 118
 119 struct latex_mathenv_type {
 120         char const *      name;
 121         char const *      basename;
 122         MathInsetTypes    typ;
 123         bool              numbered;
 124         bool              ams;
 125 };
 126
 127 latex_mathenv_type latex_mathenv[] = {
 128         {"math",         "math",         LM_OT_SIMPLE,   0, 0},
 129         {"equation*",    "equation",     LM_OT_EQUATION, 0, 0},
 130         {"equation",     "equation",     LM_OT_EQUATION, 1, 0},
 131         {"eqnarray*",    "eqnarray",     LM_OT_EQNARRAY, 0, 0},
 132         {"eqnarray",     "eqnarray",     LM_OT_EQNARRAY, 1, 0},
 133         {"align*",       "align",        LM_OT_ALIGN,    0, 1},
 134         {"align",        "align",        LM_OT_ALIGN,    1, 1},
 135         {"alignat*",     "alignat",      LM_OT_ALIGNAT,  0, 1},
 136         {"alignat",      "alignat",      LM_OT_ALIGNAT,  1, 1},
 137         {"multline*",    "multline",     LM_OT_MULTLINE, 0, 1},
 138         {"multline",     "multline",     LM_OT_MULTLINE, 1, 1},
 139         {"array",        "array",        LM_OT_MATRIX,   0, 1}
 140 };
 141
 142 int const latex_mathenv_num = sizeof(latex_mathenv)/sizeof(latex_mathenv[0]);
 143
 144
 145
 146 void mathPrintError(string const & msg)
 147 {
 148         lyxerr << "Line ~" << yylineno << ": Math parse error: " << msg << endl;
 149 }
 150
 151
 152 void LexInitCodes()
 153 {
 154         for (int i = 0; i <= 255; ++i) {
 155                 if (isalpha(i))
 156                         lexcode[i] = LexAlpha;
 157                 else if (isdigit(i))
 158                         lexcode[i] = LexDigit;
 159                 else if (isspace(i))
 160                         lexcode[i] = LexSpace;
 161                 else
 162                         lexcode[i] = LexNone;
 163         }
 164
 165         lexcode['\t'] = lexcode['\f'] = lexcode[' '] = LexSpace;
 166         lexcode['\n'] = LexNewLine;
 167         lexcode['%'] = LexComment;
 168         lexcode['#'] = LexArgument;
 169         lexcode['+'] = lexcode['-'] = lexcode['*'] = lexcode['/']
 170                 = lexcode['<'] = lexcode['>'] = lexcode['='] = LexBOP;
 171
 172         lexcode['!'] = lexcode[','] = lexcode[':']
 173                 = lexcode[';'] = LexMathSpace;
 174
 175         lexcode['('] = lexcode[')'] = lexcode['|'] = lexcode['.'] =
 176                 lexcode['?'] = LexOther;
 177
 178         lexcode['\''] = lexcode['@'] = LexAlpha;
 179
 180         lexcode['['] = lexcode[']'] = lexcode['^'] = lexcode['_'] =
 181                 lexcode['&'] = LexSelf;
 182
 183         lexcode['\\'] = LexESC;
 184         lexcode['{'] = LexOpen;
 185         lexcode['}'] = LexClose;
 186 }
 187
 188
 189 char LexGetArg(char lf, bool accept_spaces = false)
 190 {
 191         while (yyis->good()) {
 192                 char c;
 193                 yyis->get(c);
 194                 if (c > ' ') {
 195                         if (!lf)
 196                                 lf = c;
 197                         else if (c != lf) {
 198                                 lyxerr << "Math parse error: unexpected '" << c << "'" << endl;
 199                                 return '\0';
 200                         }
 201                         break;
 202                 }
 203         }
 204         char rg = 0;
 205         if (lf == '{') rg = '}';
 206         if (lf == '[') rg = ']';
 207         if (lf == '(') rg = ')';
 208         if (!rg) {
 209                 lyxerr << "Math parse error: unknown bracket '" << lf << "'" << endl;
 210                 return '\0';
 211         }
 212         yytext.erase();
 213         int bcnt = 1;
 214         do {
 215                 char c;
 216                 yyis->get(c);
 217                 if (c == lf) ++bcnt;
 218                 if (c == rg) --bcnt;
 219                 if ((c > ' ' || (c == ' ' && accept_spaces)) && bcnt > 0)
 220                         yytext += c;
 221         } while (bcnt > 0 && yyis->good());
 222
 223         return rg;
 224 }
 225
 226
 227 int yylex()
 228 {
 229         static int init_done;
 230
 231         if (!init_done) LexInitCodes();
 232
 233         while (yyis->good()) {
 234                 char c;
 235                 yyis->get(c);
 236
 237                 if (yy_mtextmode && c == ' ') {
 238                         yylval.i= ' ';
 239                         return LM_TK_ALPHA;
 240                 } else if (lexcode[c] == LexNewLine) {
 241                         ++yylineno;
 242                         continue;
 243                 } else if (lexcode[c] == LexComment) {
 244                         do {
 245                                 yyis->get(c);
 246                         } while (c != '\n' && yyis->good());  // eat comments
 247                 } else if (lexcode[c] == LexDigit
 248                            || lexcode[c] == LexOther
 249                            || lexcode[c] == LexMathSpace) {
 250                         yylval.i = c;
 251                         return LM_TK_STR;
 252                 } else if (lexcode[c] == LexAlpha) {
 253                         yylval.i = c;
 254                         return LM_TK_ALPHA;
 255                 } else if (lexcode[c] == LexBOP) {
 256                         yylval.i = c;
 257                         return LM_TK_BOP;
 258                 } else if (lexcode[c] == LexSelf) {
 259                         return c;
 260                 } else if (lexcode[c] == LexArgument) {
 261                         yyis->get(c);
 262                         yylval.i = c - '0';
 263                         return LM_TK_ARGUMENT;
 264                 } else if (lexcode[c] == LexOpen) {
 265                         return LM_TK_OPEN;
 266                 } else if (lexcode[c] == LexClose) {
 267                         return LM_TK_CLOSE;
 268                 } else if (lexcode[c] == LexESC)   {
 269                         yyis->get(c);
 270                         if (c == '\\')  {
 271                                 yylval.i = -1;
 272                                 return LM_TK_NEWLINE;
 273                         }
 274                         if (c == '(') {
 275                                 yylval.i = LM_OT_SIMPLE;
 276                                 return LM_TK_BEGIN;
 277                         }
 278                         if (c == ')') {
 279                                 yylval.i = LM_OT_SIMPLE;
 280                                 return LM_TK_END;
 281                         }
 282                         if (c == '[') {
 283                                 yylval.i = LM_OT_EQUATION;
 284                                 return LM_TK_BEGIN;
 285                         }
 286                         if (c == ']') {
 287                                 yylval.i = LM_OT_EQUATION;
 288                                 return LM_TK_END;
 289                         }
 290                         if (contains(latex_special_chars, c)) {
 291                                 yylval.i = c;
 292                                 return LM_TK_SPECIAL;
 293                         }
 294                         if (lexcode[c] == LexMathSpace) {
 295                                 int i;
 296                                 for (i = 0; i < 4 && static_cast<int>(c) != latex_mathspace[i][0]; ++i)
 297                                         ;
 298                                 yylval.i = (i < 4) ? i : 0;
 299                                 return LM_TK_SPACE;
 300                         }
 301                         if (lexcode[c] == LexAlpha || lexcode[c] == LexDigit) {
 302                                 yytext.erase();
 303                                 while (lexcode[c] == LexAlpha || lexcode[c] == LexDigit) {
 304                                         yytext += c;
 305                                         yyis->get(c);
 306                                 }
 307                                 if (yyis->good())
 308                                         yyis->putback(c);
 309                                 lyxerr << "reading: text '" << yytext << "'\n";
 310                                 latexkeys const * l = in_word_set(yytext);
 311                                 if (!l)
 312                                         return LM_TK_UNDEF;
 313
 314                                 if (l->token == LM_TK_BEGIN || l->token == LM_TK_END) {
 315                                         LexGetArg('{');
 316                                         int i = 0;
 317                                         while (i < latex_mathenv_num && yytext != latex_mathenv[i].name)
 318                                                  ++i;
 319                                         yylval.i = i;
 320                                 } else if (l->token == LM_TK_SPACE)
 321                                         yylval.i = l->id;
 322                                 else
 323                                         yylval.l = l;
 324                                 return l->token;
 325                         }
 326                 }
 327         }
 328         return 0;
 329 }
 330
 331
 332 // Accent hacks only for 0.12. Stolen from Cursor.
 333 int accent = 0;
 334 int nestaccent[8];
 335
 336 void setAccent(int ac)
 337 {
 338         if (ac > 0 && accent < 8)
 339                 nestaccent[accent++] = ac;
 340         else
 341           accent = 0;  // consumed!
 342 }
 343
 344
 345 MathInset * doAccent(byte c, MathTextCodes t)
 346 {
 347         MathInset * ac = 0;
 348
 349         for (int i = accent - 1; i >= 0; --i) {
 350                 if (i == accent - 1)
 351                   ac = new MathAccentInset(c, t, nestaccent[i]);
 352                 else
 353                   ac = new MathAccentInset(ac, nestaccent[i]);
 354         }
 355         accent = 0;  // consumed!
 356
 357         return ac;
 358 }
 359
 360
 361 MathInset * doAccent(MathInset * p)
 362 {
 363         MathInset * ac = 0;
 364
 365         for (int i = accent - 1; i >= 0; --i) {
 366                 if (i == accent - 1)
 367                   ac = new MathAccentInset(p, nestaccent[i]);
 368                 else
 369                   ac = new MathAccentInset(ac, nestaccent[i]);
 370         }
 371         accent = 0;  // consumed!
 372
 373         return ac;
 374 }
 375
 376
 377 void do_insert(MathArray & dat, MathInset * m)
 378 {
 379         if (accent)
 380                 dat.push_back(doAccent(m));
 381         else
 382                 dat.push_back(m);
 383 }
 384
 385 void do_insert(MathArray & dat, byte ch, MathTextCodes fcode)
 386 {
 387         if (accent)
 388                 dat.push_back(doAccent(ch, fcode));
 389         else
 390                 dat.push_back(ch, fcode);
 391 }
 392
 393
 394 void handle_frac(MathArray & dat, MathInsetTypes t)
 395 {
 396         MathFracInset * p = new MathFracInset(t);
 397         mathed_parse(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 398         mathed_parse(p->cell(1), FLAG_BRACE | FLAG_BRACE_LAST);
 399         dat.push_back(p);
 400 }
 401
 402
 403 MathScriptInset * lastScriptInset(MathArray & array)
 404 {
 405         MathInset * p = array.back_inset();
 406         if (!p || p->GetType() != LM_OT_SCRIPT) {
 407                 p = new MathScriptInset;
 408                 array.push_back(p);
 409         }
 410         return static_cast<MathScriptInset *>(p);
 411 }
 412
 413 }
 414
 415
 416
 417 static bool   curr_num;
 418 static string curr_label;
 419
 420 void mathed_parse_lines(MathInset * inset, int col)
 421 {
 422         MathGridInset * p = static_cast<MathGridInset *>(inset);
 423         while (1) {
 424                 // reset global variables
 425                 curr_num   = true;
 426                 curr_label = string();
 427
 428                 // reading a row
 429                 int idx = p->nargs() - p->ncols();
 430                 for (int i = 0; i < col - 1; ++i, ++idx)
 431                         mathed_parse(p->cell(idx), FLAG_AMPERSAND);
 432                 mathed_parse(p->cell(idx), FLAG_NEWLINE | FLAG_END);
 433
 434                 // Hack!
 435                 // no newline
 436                 if (yylval.i != -1)
 437                         break;
 438
 439                 p->appendRow();
 440         }
 441 }
 442
 443
 444 MathInset * mathed_parse()
 445 {
 446         MathInset * p = 0;
 447         int t = yylex();
 448
 449         switch (t) {
 450                 case LM_TK_NEWCOMMAND: {
 451                         LexGetArg('{');
 452                         string name = yytext.substr(1);
 453
 454                         int na = 0;
 455                         char const c = yyis->peek();
 456                         if (c == '[') {
 457                                 LexGetArg('[');
 458                                 na = atoi(yytext.c_str());
 459                         }
 460
 461                         p = new MathMacroTemplate(name, na);
 462                         mathed_parse(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 463                         lyxerr << "LM_TK_NEWCOMMAND: name: " << name << " na: " << na << "\n";
 464                         break;
 465                 }
 466
 467                 case LM_TK_BEGIN: {
 468                         int i = yylval.i;
 469                         lyxerr << "reading math environment " << i << " "
 470                                 << latex_mathenv[i].name << "\n";
 471
 472                         MathInsetTypes typ = latex_mathenv[i].typ;
 473                         p = new MathMatrixInset(typ);
 474                         switch (typ) {
 475
 476                                 case LM_OT_SIMPLE: {
 477                                         mathed_parse(p->cell(0), 0);
 478                                         break;
 479                                 }
 480
 481                                 case LM_OT_EQUATION: {
 482                                         mathed_parse(p->cell(0), FLAG_END);
 483                                         break;
 484                                 }
 485
 486                                 case LM_OT_EQNARRAY: {
 487                                         mathed_parse_lines(p, 3);
 488                                         break;
 489                                 }
 490
 491                                 case LM_OT_ALIGNAT: {
 492                                         LexGetArg('{');
 493                                         //int c = atoi(yytext.c_str());
 494                                         lyxerr << "LM_OT_ALIGNAT: not implemented\n";
 495                                         mathed_parse_lines(p, 2);
 496                                         lyxerr << "LM_OT_ALIGNAT: par: " << *p << "\n";
 497                                         break;
 498                                 }
 499
 500                                 default:
 501                                         lyxerr << "1: unknown math environment: " << typ << "\n";
 502                         }
 503
 504                         p->SetName(latex_mathenv[i].basename);
 505
 506 /*
 507                         curr_num = latex_mathenv[i].numbered;
 508                         p->numbered(p->nrows()-1, curr_num);
 509 */
 510                         break;
 511                 }
 512
 513                 default:
 514                         lyxerr << "2 unknown math environment: " << t << "\n";
 515         }
 516
 517         return p;
 518 }
 519
 520
 521 void mathed_parse(MathArray & array, unsigned flags)
 522 {
 523         int  t = yylex();
 524         int  tprev = 0;
 525         bool panic = false;
 526         static int plevel = -1;
 527         MathTextCodes varcode = LM_TC_VAR;
 528
 529         int brace = 0;
 530         int acc_brace = 0;
 531         int acc_braces[8];
 532
 533         ++plevel;
 534         while (t) {
 535                 //lyxerr << "t: " << t << " flags: " << flags;
 536                 //array.dump(lyxerr);
 537                 //lyxerr << "\n";
 538
 539                 if ((flags & FLAG_BRACE) && t != LM_TK_OPEN) {
 540                         if (!(flags & FLAG_BRACK_ARG) || t != '[') {
 541                                 mathPrintError(
 542                                         "Expected {. Maybe you forgot to enclose an argument in {}");
 543                                 panic = true;
 544                                 break;
 545                         }
 546                 }
 547
 548                 switch (t) {
 549
 550                 case LM_TK_ALPHA:
 551                         do_insert(array, yylval.i, varcode);
 552                         break;
 553
 554                 case LM_TK_ARGUMENT:
 555                         array.push_back(new MathMacroArgument(yylval.i));
 556                         break;
 557
 558                 case LM_TK_SPECIAL:
 559                         array.push_back(yylval.i, LM_TC_SPECIAL);
 560                         break;
 561
 562                 case LM_TK_STR:
 563                         do_insert(array, yylval.i, LM_TC_CONST);
 564                         break;
 565
 566                 case LM_TK_OPEN:
 567                         ++brace;
 568                         if (accent && tprev == LM_TK_ACCENT) {
 569                                 acc_braces[acc_brace++] = brace;
 570                                 break;
 571                         }
 572                         if (flags & FLAG_BRACE_OPT) {
 573                                 flags &= ~FLAG_BRACE_OPT;
 574                                 flags |= FLAG_BRACE;
 575                         }
 576
 577                         if (flags & FLAG_BRACE)
 578                                 flags &= ~FLAG_BRACE;
 579                         else
 580                                 array.push_back('{', LM_TC_TEX);
 581                         break;
 582
 583                 case LM_TK_CLOSE:
 584                         --brace;
 585                         if (brace < 0) {
 586                                 mathPrintError("Unmatching braces");
 587                                 panic = true;
 588                                 break;
 589                         }
 590                         if (acc_brace && brace == acc_braces[acc_brace - 1] - 1) {
 591                                 --acc_brace;
 592                                 break;
 593                         }
 594                         if (flags & FLAG_BRACE_FONT) {
 595                                 varcode = LM_TC_VAR;
 596                                 yy_mtextmode = false;
 597                                 flags &= ~FLAG_BRACE_FONT;
 598                                 break;
 599                         }
 600                         if (brace == 0 && (flags & FLAG_BRACE_LAST)) {
 601                                 --plevel;
 602                                 return;
 603                         }
 604                         array.push_back('}', LM_TC_TEX);
 605                         break;
 606
 607                 case '[':
 608                         if (flags & FLAG_BRACK_ARG) {
 609                                 flags &= ~FLAG_BRACK_ARG;
 610                                 char const rg = LexGetArg('[');
 611                                 if (rg != ']') {
 612                                         mathPrintError("Expected ']'");
 613                                         panic = true;
 614                                         break;
 615                                 }
 616                         } else
 617                                 array.push_back('[', LM_TC_CONST);
 618                         break;
 619
 620                 case ']':
 621                         if (flags & FLAG_BRACK_END) {
 622                                 --plevel;
 623                                 return;
 624                         }
 625                         array.push_back(']', LM_TC_CONST);
 626                         break;
 627
 628                 case '^':
 629                 {
 630                         MathArray ar;
 631                         mathed_parse(ar, FLAG_BRACE_OPT | FLAG_BRACE_LAST);
 632                         MathScriptInset * p = lastScriptInset(array);
 633                         p->setData(ar, 0);
 634                         p->up(true);
 635                         break;
 636                 }
 637
 638                 case '_':
 639                 {
 640                         MathArray ar;
 641                         mathed_parse(ar, FLAG_BRACE_OPT | FLAG_BRACE_LAST);
 642                         MathScriptInset * p = lastScriptInset(array);
 643                         p->setData(ar, 1);
 644                         p->down(true);
 645                         break;
 646                 }
 647
 648                 case LM_TK_LIMIT:
 649                 {
 650                         MathScriptInset * p = lastScriptInset(array);
 651                         if (p)
 652                                 p->SetLimits(bool(yylval.l->id));
 653                         break;
 654                 }
 655
 656                 case '&':
 657                 {
 658                         if (flags & FLAG_AMPERSAND) {
 659                                 flags &= ~FLAG_AMPERSAND;
 660                                 --plevel;
 661                                 return;
 662                         }
 663                         lyxerr << "found tab unexpectedly, array: '" << array << "'\n";
 664                         break;
 665                 }
 666
 667                 case LM_TK_NEWLINE:
 668                 {
 669                         if (flags & FLAG_NEWLINE) {
 670                                 flags &= ~FLAG_NEWLINE;
 671                                 --plevel;
 672                                 return;
 673                         }
 674                         lyxerr << "found newline unexpectedly, array: '" << array << "'\n";
 675                         break;
 676                 }
 677
 678                 case LM_TK_BIGSYM:
 679                 {
 680                         array.push_back(new MathBigopInset(yylval.l->name, yylval.l->id));
 681                         break;
 682                 }
 683
 684                 case LM_TK_SYM:
 685                         if (yylval.l->id < 256) {
 686                                 MathTextCodes tc = MathIsBOPS(yylval.l->id) ? LM_TC_BOPS: LM_TC_SYMB;
 687                                 do_insert(array, yylval.l->id, tc);
 688                         } else
 689                                 do_insert(array, new MathFuncInset(yylval.l->name));
 690                         break;
 691
 692                 case LM_TK_BOP:
 693                         do_insert(array, yylval.i, LM_TC_BOP);
 694                         break;
 695
 696                 case LM_TK_SPACE:
 697                         if (yylval.i >= 0)
 698                                 array.push_back(new MathSpaceInset(yylval.i));
 699                         break;
 700
 701                 case LM_TK_DOTS:
 702                         array.push_back(new MathDotsInset(yylval.l->name, yylval.l->id));
 703                         break;
 704
 705                 case LM_TK_CHOOSE:
 706                         handle_frac(array, LM_OT_ATOP);
 707                         break;
 708
 709                 case LM_TK_STACK:
 710                         handle_frac(array, LM_OT_STACKREL);
 711                         break;
 712
 713                 case LM_TK_FRAC:
 714                         handle_frac(array, LM_OT_FRAC);
 715                         break;
 716
 717                 case LM_TK_SQRT:
 718                 {
 719                         char c;
 720                         yyis->get(c);
 721                         if (c == '[') {
 722                                 MathRootInset * rt = new MathRootInset;
 723                                 mathed_parse(rt->cell(0), FLAG_BRACK_END);
 724                                 mathed_parse(rt->cell(1), FLAG_BRACE | FLAG_BRACE_LAST);
 725                                 array.push_back(rt);
 726                         } else {
 727                                 yyis->putback(c);
 728                                 MathSqrtInset * sq = new MathSqrtInset;
 729                                 mathed_parse(sq->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 730                                 array.push_back(sq);
 731                         }
 732                         break;
 733                 }
 734
 735                 case LM_TK_LEFT:
 736                 {
 737                         int ld = yylex();
 738                         if (ld == LM_TK_SYM)
 739                                 ld = yylval.l->id;
 740                         else if (ld == LM_TK_STR || ld == LM_TK_BOP || ld == LM_TK_SPECIAL)
 741                                 ld = yylval.i;
 742
 743                         MathArray ar;
 744                         mathed_parse(ar, FLAG_RIGHT);
 745
 746                         int rd = yylex();
 747                         if (rd == LM_TK_SYM)
 748                                 rd = yylval.l->id;
 749                         else if (rd == LM_TK_STR || rd == LM_TK_BOP || rd == LM_TK_SPECIAL)
 750                                 rd = yylval.i;
 751
 752                         MathDelimInset * dl = new MathDelimInset(ld, rd);
 753                         dl->setData(ar, 0);
 754                         array.push_back(dl);
 755                         break;
 756                 }
 757
 758                 case LM_TK_RIGHT:
 759                         if (flags & FLAG_RIGHT) {
 760                                 --plevel;
 761                                 return;
 762                         }
 763                         mathPrintError("Unmatched right delimiter");
 764 //        panic = true;
 765                         break;
 766
 767                 case LM_TK_FONT:
 768                         yy_mtextmode = (yylval.l->id == LM_TC_TEXTRM);
 769                         flags |= (FLAG_BRACE | FLAG_BRACE_FONT);
 770                         break;
 771
 772                 case LM_TK_STY:
 773                 {
 774                         lyxerr << "LM_TK_STY not implemented\n";
 775                         //MathArray tmp = array;
 776                         //MathSizeInset * p = new MathSizeInset(MathStyles(yylval.l->id));
 777                         //array.push_back(p);
 778                         //mathed_parse(p->cell(0), FLAG_BRACE_FONT);
 779                         break;
 780                 }
 781
 782
 783                 case LM_TK_WIDE:
 784                 {
 785                         MathDecorationInset * sq = new MathDecorationInset(yylval.l->id);
 786                         mathed_parse(sq->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 787                         array.push_back(sq);
 788                         break;
 789                 }
 790
 791                 case LM_TK_ACCENT:
 792                         setAccent(yylval.l->id);
 793                         break;
 794
 795                 case LM_TK_NONUM:
 796                         curr_num = false;
 797                         break;
 798
 799                 case LM_TK_PMOD:
 800                 case LM_TK_FUNC:
 801                         if (accent)
 802                                 array.push_back(t, LM_TC_CONST);
 803                         else
 804                                 array.push_back(new MathFuncInset(yylval.l->name));
 805                         break;
 806
 807                 case LM_TK_FUNCLIM:
 808                         array.push_back(new MathFuncInset(yylval.l->name, LM_OT_FUNCLIM));
 809                         break;
 810
 811                 case LM_TK_UNDEF:
 812                         if (MathMacroTable::hasTemplate(yytext)) {
 813                                 MathMacro * m = MathMacroTable::cloneTemplate(yytext);
 814                                 for (int i = 0; i < m->nargs(); ++i) {
 815                                         mathed_parse(m->cell(i), FLAG_BRACE_OPT | FLAG_BRACE_LAST);
 816                                         lyxerr << "reading cell " << i << " '" << m->cell(i) << "'\n";
 817                                 }
 818                                 do_insert(array, m);
 819                         } else
 820                                 do_insert(array, new MathFuncInset(yytext, LM_OT_UNDEF));
 821                         break;
 822
 823                 case LM_TK_END:
 824                         --plevel;
 825                         return;
 826
 827                 case LM_TK_BEGIN:
 828                 {
 829                         int i = yylval.i;
 830                         MathInsetTypes typ = latex_mathenv[i].typ;
 831
 832                         if (typ == LM_OT_MATRIX) {
 833                                 string valign = "\0";
 834                                 char rg = LexGetArg(0);
 835                                 if (rg == ']') {
 836                                         valign = yytext;
 837                                         rg = LexGetArg('{');
 838                                 }
 839
 840                                 string halign = yytext;
 841                                 MathArrayInset * mm = new MathArrayInset(halign.size(), 1);
 842                                 valign += 'c';
 843                                 mm->valign(valign[0]);
 844                                 mm->halign(halign);
 845
 846                                 mathed_parse_lines(mm, halign.size());
 847                                 do_insert(array, mm);
 848                                 //lyxerr << "read matrix " << *mm << "\n";
 849                                 break;
 850                         } else
 851                                 lyxerr << "unknow math inset " << typ << "\n";
 852                         break;
 853                 }
 854
 855                 case LM_TK_MACRO:
 856                         do_insert(array, MathMacroTable::cloneTemplate(yylval.l->name));
 857                         break;
 858
 859                 case LM_TK_LABEL:
 860                 {
 861                         char const rg = LexGetArg('\0', true);
 862                         if (rg != '}') {
 863                                 mathPrintError("Expected '{'");
 864                                 // debug info
 865                                 lyxerr << "[" << yytext << "]" << endl;
 866                                 panic = true;
 867                                 break;
 868                         }
 869                         //lyxerr << " setting label to " << yytext << "\n";
 870                         curr_label = yytext;
 871                         break;
 872                 }
 873
 874                 default:
 875                         mathPrintError("Unrecognized token");
 876                         lyxerr << "[" << t << " " << yytext << "]" << endl;
 877                         break;
 878
 879                 } // end of big switch
 880
 881                 tprev = t;
 882                 if (panic) {
 883                         lyxerr << " Math Panic, expect problems!" << endl;
 884                         //   Search for the end command.
 885                         do {
 886                                 t = yylex();
 887                         } while (t != LM_TK_END && t);
 888                 } else
 889                         t = yylex();
 890
 891                 if (flags & FLAG_BRACE_OPT) {
 892                         flags &= ~FLAG_BRACE_OPT;
 893                         break;
 894                 }
 895         }
 896         --plevel;
 897 }
 898
 899
 900 MathInset * mathed_parse(istream & is)
 901 {
 902         yyis     = &is;
 903         yylineno = 0;
 904         return mathed_parse();
 905 }
 906
 907
 908 MathInset * mathed_parse(LyXLex & lex)
 909 {
 910         yyis     = &lex.getStream();
 911         yylineno = lex.GetLineNo();
 912
 913         MathInset * p = mathed_parse();
 914
 915         // Update line number
 916         lex.setLineNo(yylineno);
 917
 918         // reading of end_inset
 919         while (lex.IsOK()) {
 920                 lex.nextToken();
 921                 if (lex.GetString() == "\\end_inset")
 922                         break;
 923                 lyxerr << "InsetFormula::Read: Garbage before \\end_inset,"
 924                         " or missing \\end_inset!" << endl;
 925         }
 926
 927         return p;
 928 }
 929
 930