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 char const * latex_special_chars = "#$%&_{}";
  76
  77
  78 /// Read TeX into data, flags give stop conditions
  79 void mathed_parse(MathArray & data, unsigned flags);
  80
  81
  82 namespace {
  83
  84 unsigned char getuchar(std::istream * is)
  85 {
  86         char c;
  87         is->get(c);
  88         return static_cast<unsigned char>(c);
  89 }
  90
  91 const unsigned char LM_TK_OPEN  = '{';
  92 const unsigned char LM_TK_CLOSE = '}';
  93
  94 enum {
  95         FLAG_BRACE      = 1 << 0,  //  A { needed              //}
  96         FLAG_BRACE_OPT  = 1 << 2,  //  Optional {
  97         FLAG_BRACE_LAST = 1 << 3,  //  Last } ends the parsing process
  98         FLAG_BRACK_ARG  = 1 << 4,  //  Optional [
  99         FLAG_RIGHT      = 1 << 5,  //  Next right ends the parsing process
 100         FLAG_END        = 1 << 6,  //  Next end ends the parsing process
 101         FLAG_BRACE_FONT = 1 << 7,  //  Next } closes a font
 102         FLAG_BRACK_END  = 1 << 9,  //  Next ] ends the parsing process
 103         FLAG_AMPERSAND  = 1 << 10, //  Next & ends the parsing process
 104         FLAG_NEWLINE    = 1 << 11  //  Next \\ ends the parsing process
 105 };
 106
 107
 108 ///
 109 union {
 110         ///
 111         int i;
 112         ///
 113         latexkeys const * l;
 114 } yylval;
 115
 116
 117 string yytext;
 118 int yylineno;
 119 istream * yyis;
 120 MathTextCodes yyvarcode;
 121
 122
 123
 124 struct latex_mathenv_type {
 125         char const *      name;
 126         char const *      basename;
 127         MathInsetTypes    typ;
 128         bool              numbered;
 129         bool              ams;
 130 };
 131
 132 latex_mathenv_type latex_mathenv[] = {
 133         {"math",         "math",         LM_OT_SIMPLE,   0, 0},
 134         {"equation*",    "equation",     LM_OT_EQUATION, 0, 0},
 135         {"equation",     "equation",     LM_OT_EQUATION, 1, 0},
 136         {"eqnarray*",    "eqnarray",     LM_OT_EQNARRAY, 0, 0},
 137         {"eqnarray",     "eqnarray",     LM_OT_EQNARRAY, 1, 0},
 138         {"align*",       "align",        LM_OT_ALIGN,    0, 1},
 139         {"align",        "align",        LM_OT_ALIGN,    1, 1},
 140         {"alignat*",     "alignat",      LM_OT_ALIGNAT,  0, 1},
 141         {"alignat",      "alignat",      LM_OT_ALIGNAT,  1, 1},
 142         {"multline*",    "multline",     LM_OT_MULTLINE, 0, 1},
 143         {"multline",     "multline",     LM_OT_MULTLINE, 1, 1},
 144         {"array",        "array",        LM_OT_MATRIX,   0, 1}
 145 };
 146
 147 int const latex_mathenv_num = sizeof(latex_mathenv)/sizeof(latex_mathenv[0]);
 148
 149
 150
 151 void mathPrintError(string const & msg)
 152 {
 153         lyxerr[Debug::MATHED] << "Line ~" << yylineno << ": Math parse error: " << msg << endl;
 154 }
 155
 156
 157 void LexInitCodes()
 158 {
 159         for (int i = 0; i <= 255; ++i) {
 160                 if (isdigit(i))
 161                         lexcode[i] = LexDigit;
 162                 else if (isspace(i))
 163                         lexcode[i] = LexSpace;
 164                 else
 165                         lexcode[i] = LexAlpha;
 166         }
 167
 168         lexcode['\t'] = lexcode['\f'] = lexcode[' '] = LexSpace;
 169         lexcode['\n'] = LexNewLine;
 170         lexcode['%'] = LexComment;
 171         lexcode['#'] = LexArgument;
 172         lexcode['+'] = lexcode['-'] = lexcode['*'] = lexcode['/']
 173                 = lexcode['<'] = lexcode['>'] = lexcode['='] = LexBOP;
 174
 175         lexcode['!'] = lexcode[','] = lexcode[':']
 176                 = lexcode[';'] = LexMathSpace;
 177
 178         lexcode['('] = lexcode[')'] = lexcode['|'] = lexcode['.'] =
 179                 lexcode['?'] = LexOther;
 180
 181         lexcode['\''] = lexcode['@'] = LexAlpha;
 182
 183         lexcode['['] = lexcode[']'] = lexcode['^'] = lexcode['_'] =
 184                 lexcode['&'] = LexSelf;
 185
 186         lexcode['\\'] = LexESC;
 187         lexcode['{'] = LexOpen;
 188         lexcode['}'] = LexClose;
 189 }
 190
 191
 192 unsigned char LexGetArg(unsigned char lf, bool accept_spaces = false)
 193 {
 194         while (yyis->good()) {
 195                 unsigned char c = getuchar(yyis);
 196                 if (c > ' ') {
 197                         if (!lf)
 198                                 lf = c;
 199                         else if (c != lf) {
 200                                 lyxerr[Debug::MATHED] << "Math parse error: unexpected '" << c << "'" << endl;
 201                                 return '\0';
 202                         }
 203                         break;
 204                 }
 205         }
 206         unsigned char rg = 0;
 207         if (lf == '{') rg = '}';
 208         if (lf == '[') rg = ']';
 209         if (lf == '(') rg = ')';
 210         if (!rg) {
 211                 lyxerr[Debug::MATHED] << "Math parse error: unknown bracket '" << lf << "'" << endl;
 212                 return '\0';
 213         }
 214         yytext.erase();
 215         int bcnt = 1;
 216         do {
 217                 unsigned char c = getuchar(yyis);
 218                 if (c == lf) ++bcnt;
 219                 if (c == rg) --bcnt;
 220                 if ((c > ' ' || (c == ' ' && accept_spaces)) && bcnt > 0)
 221                         yytext += c;
 222         } while (bcnt > 0 && yyis->good());
 223
 224         return rg;
 225 }
 226
 227
 228 int yylex()
 229 {
 230         static int init_done;
 231
 232         if (!init_done) LexInitCodes();
 233
 234         while (yyis->good()) {
 235                 unsigned char c = getuchar(yyis);
 236                 //lyxerr << "reading byte: '" << c << "' code: " << lexcode[c] << endl;
 237
 238                 if (yyvarcode == LM_TC_TEXTRM && c == ' ') {
 239                         yylval.i = ' ';
 240                         return LM_TK_ALPHA;
 241                 } else if (lexcode[c] == LexNewLine) {
 242                         ++yylineno;
 243                         continue;
 244                 } else if (lexcode[c] == LexComment) {
 245                         do {
 246                                 c = getuchar(yyis);
 247                         } while (c != '\n' && yyis->good());  // eat comments
 248                 } else if (lexcode[c] == LexDigit
 249                            || lexcode[c] == LexOther
 250                            || lexcode[c] == LexMathSpace) {
 251                         yylval.i = c;
 252                         return LM_TK_STR;
 253                 } else if (lexcode[c] == LexAlpha) {
 254                         yylval.i = c;
 255                         return LM_TK_ALPHA;
 256                 } else if (lexcode[c] == LexBOP) {
 257                         yylval.i = c;
 258                         return LM_TK_BOP;
 259                 } else if (lexcode[c] == LexSelf) {
 260                         return c;
 261                 } else if (lexcode[c] == LexArgument) {
 262                         c = getuchar(yyis);
 263                         yylval.i = c - '0';
 264                         return LM_TK_ARGUMENT;
 265                 } else if (lexcode[c] == LexOpen) {
 266                         return LM_TK_OPEN;
 267                 } else if (lexcode[c] == LexClose) {
 268                         return LM_TK_CLOSE;
 269                 } else if (lexcode[c] == LexESC)   {
 270                         c = getuchar(yyis);
 271                         if (c == '\\')  {
 272                                 yylval.i = -1;
 273                                 return LM_TK_NEWLINE;
 274                         }
 275                         if (c == '(') {
 276                                 yylval.i = LM_OT_SIMPLE;
 277                                 return LM_TK_BEGIN;
 278                         }
 279                         if (c == ')') {
 280                                 yylval.i = LM_OT_SIMPLE;
 281                                 return LM_TK_END;
 282                         }
 283                         if (c == '[') {
 284                                 yylval.i = LM_OT_EQUATION;
 285                                 return LM_TK_BEGIN;
 286                         }
 287                         if (c == ']') {
 288                                 yylval.i = LM_OT_EQUATION;
 289                                 return LM_TK_END;
 290                         }
 291                         if (contains(latex_special_chars, c)) {
 292                                 yylval.i = c;
 293                                 return LM_TK_SPECIAL;
 294                         }
 295                         if (lexcode[c] == LexMathSpace) {
 296                                 int i;
 297                                 for (i = 0; i < 4 && static_cast<int>(c) != latex_mathspace[i][0]; ++i)
 298                                         ;
 299                                 yylval.i = (i < 4) ? i : 0;
 300                                 return LM_TK_SPACE;
 301                         }
 302                         if (lexcode[c] == LexAlpha || lexcode[c] == LexDigit) {
 303                                 yytext.erase();
 304                                 while (lexcode[c] == LexAlpha || lexcode[c] == LexDigit) {
 305                                         yytext += c;
 306                                         c = getuchar(yyis);
 307                                 }
 308                                 if (yyis->good())
 309                                         yyis->putback(c);
 310                                 lyxerr[Debug::MATHED] << "reading: text '" << yytext << "'\n";
 311                                 latexkeys const * l = in_word_set(yytext);
 312                                 if (!l)
 313                                         return LM_TK_UNDEF;
 314
 315                                 if (l->token == LM_TK_BEGIN || l->token == LM_TK_END) {
 316                                         LexGetArg('{');
 317                                         int i = 0;
 318                                         while (i < latex_mathenv_num && yytext != latex_mathenv[i].name)
 319                                                  ++i;
 320                                         yylval.i = i;
 321                                 } else if (l->token == LM_TK_SPACE)
 322                                         yylval.i = l->id;
 323                                 else
 324                                         yylval.l = l;
 325                                 return l->token;
 326                         }
 327                 }
 328         }
 329         return 0;
 330 }
 331
 332
 333 // Accent hacks only for 0.12. Stolen from Cursor.
 334 int accent = 0;
 335 int nestaccent[8];
 336
 337 void setAccent(int ac)
 338 {
 339         if (ac > 0 && accent < 8)
 340                 nestaccent[accent++] = ac;
 341         else
 342           accent = 0;  // consumed!
 343 }
 344
 345
 346 MathInset * doAccent(unsigned char c, MathTextCodes t)
 347 {
 348         MathInset * ac = 0;
 349
 350         for (int i = accent - 1; i >= 0; --i) {
 351                 if (i == accent - 1)
 352                   ac = new MathAccentInset(c, t, nestaccent[i]);
 353                 else
 354                   ac = new MathAccentInset(ac, nestaccent[i]);
 355         }
 356         accent = 0;  // consumed!
 357
 358         return ac;
 359 }
 360
 361
 362 MathInset * doAccent(MathInset * p)
 363 {
 364         MathInset * ac = 0;
 365
 366         for (int i = accent - 1; i >= 0; --i) {
 367                 if (i == accent - 1)
 368                   ac = new MathAccentInset(p, nestaccent[i]);
 369                 else
 370                   ac = new MathAccentInset(ac, nestaccent[i]);
 371         }
 372         accent = 0;  // consumed!
 373
 374         return ac;
 375 }
 376
 377
 378 void do_insert(MathArray & dat, MathInset * m)
 379 {
 380         if (accent)
 381                 dat.push_back(doAccent(m));
 382         else
 383                 dat.push_back(m);
 384 }
 385
 386 void do_insert(MathArray & dat, unsigned char ch, MathTextCodes fcode)
 387 {
 388         if (accent)
 389                 dat.push_back(doAccent(ch, fcode));
 390         else
 391                 dat.push_back(ch, fcode);
 392 }
 393
 394
 395 void handle_frac(MathArray & dat, string const & name)
 396 {
 397         MathFracInset * p = new MathFracInset(name);
 398         mathed_parse(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 399         mathed_parse(p->cell(1), FLAG_BRACE | FLAG_BRACE_LAST);
 400         dat.push_back(p);
 401 }
 402
 403
 404 MathScriptInset * lastScriptInset(MathArray & array)
 405 {
 406         MathInset * p = array.back_inset();
 407         if (!p || !p->isScriptInset()) {
 408                 p = new MathScriptInset;
 409                 array.push_back(p);
 410         }
 411         return static_cast<MathScriptInset *>(p);
 412 }
 413
 414 }
 415
 416
 417
 418 static bool   curr_num;
 419 static string curr_label;
 420
 421 void mathed_parse_lines(MathInset * inset, int col, bool numbered, bool outmost)
 422 {
 423         // save global variables
 424         bool   saved_num   = curr_num;
 425         string saved_label = curr_label;
 426
 427         MathGridInset * p = static_cast<MathGridInset *>(inset);
 428         for (int row = 0; true; ++row) {
 429                 // reset global variables
 430                 curr_num   = numbered;
 431                 curr_label = string();
 432
 433                 // reading a row
 434                 int idx = p->nargs() - p->ncols();
 435                 for (int i = 0; i < col - 1; ++i, ++idx)
 436                         mathed_parse(p->cell(idx), FLAG_AMPERSAND);
 437                 mathed_parse(p->cell(idx), FLAG_NEWLINE | FLAG_END);
 438
 439                 if (outmost) {
 440                         MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
 441                         m->numbered(row, curr_num);
 442                         m->label(row, curr_label);
 443                 }
 444
 445                 // Hack!
 446                 // no newline
 447                 if (yylval.i != -1)
 448                         break;
 449
 450                 p->appendRow();
 451         }
 452
 453         // restore global variables
 454         curr_num   = saved_num;
 455         curr_label = saved_label;
 456 }
 457
 458
 459 MathInset * mathed_parse()
 460 {
 461         MathInset * p = 0;
 462         int t = yylex();
 463
 464         switch (t) {
 465                 case LM_TK_NEWCOMMAND: {
 466                         LexGetArg('{');
 467                         string name = yytext.substr(1);
 468
 469                         int na = 0;
 470                         unsigned char const c = yyis->peek();
 471                         if (c == '[') {
 472                                 LexGetArg('[');
 473                                 na = atoi(yytext.c_str());
 474                         }
 475
 476                         p = new MathMacroTemplate(name, na);
 477                         mathed_parse(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 478                         lyxerr[Debug::MATHED] << "LM_TK_NEWCOMMAND: name: " << name << " na: " << na << "\n";
 479                         break;
 480                 }
 481
 482                 case LM_TK_BEGIN: {
 483                         int i = yylval.i;
 484                         lyxerr[Debug::MATHED] << "reading math environment " << i << " "
 485                                 << latex_mathenv[i].name << "\n";
 486
 487                         MathInsetTypes typ = latex_mathenv[i].typ;
 488                         p = new MathMatrixInset(typ);
 489                         switch (typ) {
 490
 491                                 case LM_OT_SIMPLE: {
 492                                         curr_num   = latex_mathenv[i].numbered;
 493                                         curr_label = string();
 494                                         mathed_parse(p->cell(0), 0);
 495                                         MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
 496                                         m->numbered(0, curr_num);
 497                                         m->label(0, curr_label);
 498                                         break;
 499                                 }
 500
 501                                 case LM_OT_EQUATION: {
 502                                         curr_num   = latex_mathenv[i].numbered;
 503                                         curr_label = string();
 504                                         mathed_parse(p->cell(0), FLAG_END);
 505                                         MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
 506                                         m->numbered(0, curr_num);
 507                                         m->label(0, curr_label);
 508                                         break;
 509                                 }
 510
 511                                 case LM_OT_EQNARRAY: {
 512                                         mathed_parse_lines(p, 3, latex_mathenv[i].numbered, true);
 513                                         break;
 514                                 }
 515
 516                                 case LM_OT_ALIGNAT: {
 517                                         LexGetArg('{');
 518                                         //int c = atoi(yytext.c_str());
 519                                         lyxerr[Debug::MATHED] << "LM_OT_ALIGNAT: not implemented\n";
 520                                         mathed_parse_lines(p, 2, latex_mathenv[i].numbered, true);
 521                                         lyxerr[Debug::MATHED] << "LM_OT_ALIGNAT: par: " << *p << "\n";
 522                                         break;
 523                                 }
 524
 525                                 default:
 526                                         lyxerr[Debug::MATHED] << "1: unknown math environment: " << typ << "\n";
 527                         }
 528
 529                         p->SetName(latex_mathenv[i].basename);
 530
 531                         break;
 532                 }
 533
 534                 default:
 535                         lyxerr[Debug::MATHED] << "2 unknown math environment: " << t << "\n";
 536         }
 537
 538         return p;
 539 }
 540
 541
 542 void mathed_parse(MathArray & array, unsigned flags)
 543 {
 544         int  t = yylex();
 545         int  tprev = 0;
 546         bool panic = false;
 547         static int plevel = -1;
 548         yyvarcode = LM_TC_VAR;
 549
 550         int brace = 0;
 551         int acc_brace = 0;
 552         int acc_braces[8];
 553
 554         ++plevel;
 555         while (t) {
 556                 //lyxerr << "t: " << t << " flags: " << flags;
 557                 //array.dump(lyxerr);
 558                 //lyxerr << "\n";
 559
 560                 if ((flags & FLAG_BRACE) && t != LM_TK_OPEN) {
 561                         if (!(flags & FLAG_BRACK_ARG) || t != '[') {
 562                                 mathPrintError(
 563                                         "Expected {. Maybe you forgot to enclose an argument in {}");
 564                                 panic = true;
 565                                 break;
 566                         }
 567                 }
 568
 569                 switch (t) {
 570
 571                 case LM_TK_ALPHA:
 572                         do_insert(array, yylval.i, yyvarcode);
 573                         break;
 574
 575                 case LM_TK_ARGUMENT:
 576                         array.push_back(new MathMacroArgument(yylval.i));
 577                         break;
 578
 579                 case LM_TK_SPECIAL:
 580                         array.push_back(yylval.i, LM_TC_SPECIAL);
 581                         break;
 582
 583                 case LM_TK_STR:
 584                         do_insert(array, yylval.i, LM_TC_CONST);
 585                         break;
 586
 587                 case LM_TK_OPEN:
 588                         ++brace;
 589                         if (accent && tprev == LM_TK_ACCENT) {
 590                                 acc_braces[acc_brace++] = brace;
 591                                 break;
 592                         }
 593                         if (flags & FLAG_BRACE_OPT) {
 594                                 flags &= ~FLAG_BRACE_OPT;
 595                                 flags |= FLAG_BRACE;
 596                         }
 597
 598                         if (flags & FLAG_BRACE)
 599                                 flags &= ~FLAG_BRACE;
 600                         else
 601                                 array.push_back('{', LM_TC_TEX);
 602                         break;
 603
 604                 case LM_TK_CLOSE:
 605                         --brace;
 606                         if (brace < 0) {
 607                                 mathPrintError("Unmatching braces");
 608                                 panic = true;
 609                                 break;
 610                         }
 611                         if (acc_brace && brace == acc_braces[acc_brace - 1] - 1) {
 612                                 --acc_brace;
 613                                 break;
 614                         }
 615                         if (flags & FLAG_BRACE_FONT) {
 616                                 yyvarcode = LM_TC_VAR;
 617                                 flags &= ~FLAG_BRACE_FONT;
 618                                 break;
 619                         }
 620                         if (brace == 0 && (flags & FLAG_BRACE_LAST)) {
 621                                 --plevel;
 622                                 return;
 623                         }
 624                         array.push_back('}', LM_TC_TEX);
 625                         break;
 626
 627                 case '[':
 628                         if (flags & FLAG_BRACK_ARG) {
 629                                 flags &= ~FLAG_BRACK_ARG;
 630                                 unsigned char const rg = LexGetArg('[');
 631                                 if (rg != ']') {
 632                                         mathPrintError("Expected ']'");
 633                                         panic = true;
 634                                         break;
 635                                 }
 636                         } else
 637                                 array.push_back('[', LM_TC_CONST);
 638                         break;
 639
 640                 case ']':
 641                         if (flags & FLAG_BRACK_END) {
 642                                 --plevel;
 643                                 return;
 644                         }
 645                         array.push_back(']', LM_TC_CONST);
 646                         break;
 647
 648                 case '^':
 649                 {
 650                         MathArray ar;
 651                         mathed_parse(ar, FLAG_BRACE_OPT | FLAG_BRACE_LAST);
 652                         MathScriptInset * p = lastScriptInset(array);
 653                         p->setData(ar, 0);
 654                         p->up(true);
 655                         break;
 656                 }
 657
 658                 case '_':
 659                 {
 660                         MathArray ar;
 661                         mathed_parse(ar, FLAG_BRACE_OPT | FLAG_BRACE_LAST);
 662                         MathScriptInset * p = lastScriptInset(array);
 663                         p->setData(ar, 1);
 664                         p->down(true);
 665                         break;
 666                 }
 667
 668                 case LM_TK_LIMIT:
 669                 {
 670                         MathScriptInset * p = lastScriptInset(array);
 671                         if (p)
 672                                 p->limits(yylval.l->id ? 1 : -1);
 673                         break;
 674                 }
 675
 676                 case '&':
 677                 {
 678                         if (flags & FLAG_AMPERSAND) {
 679                                 flags &= ~FLAG_AMPERSAND;
 680                                 --plevel;
 681                                 return;
 682                         }
 683                         lyxerr[Debug::MATHED] << "found tab unexpectedly, array: '" << array << "'\n";
 684                         break;
 685                 }
 686
 687                 case LM_TK_NEWLINE:
 688                 {
 689                         if (flags & FLAG_NEWLINE) {
 690                                 flags &= ~FLAG_NEWLINE;
 691                                 --plevel;
 692                                 return;
 693                         }
 694                         lyxerr[Debug::MATHED] << "found newline unexpectedly, array: '" << array << "'\n";
 695                         break;
 696                 }
 697
 698                 case LM_TK_BIGSYM:
 699                 {
 700                         array.push_back(new MathBigopInset(yylval.l->name, yylval.l->id));
 701                         break;
 702                 }
 703
 704                 case LM_TK_SYM:
 705                         if (yylval.l->id < 256) {
 706                                 MathTextCodes tc = MathIsBOPS(yylval.l->id) ? LM_TC_BOPS: LM_TC_SYMB;
 707                                 do_insert(array, yylval.l->id, tc);
 708                         } else
 709                                 do_insert(array, new MathFuncInset(yylval.l->name));
 710                         break;
 711
 712                 case LM_TK_BOP:
 713                         do_insert(array, yylval.i, LM_TC_BOP);
 714                         break;
 715
 716                 case LM_TK_SPACE:
 717                         if (yylval.i >= 0)
 718                                 array.push_back(new MathSpaceInset(yylval.i));
 719                         break;
 720
 721                 case LM_TK_DOTS:
 722                         array.push_back(new MathDotsInset(yylval.l->name, yylval.l->id));
 723                         break;
 724
 725                 case LM_TK_CHOOSE:
 726                         handle_frac(array, "atop");
 727                         break;
 728
 729                 case LM_TK_STACK:
 730                         handle_frac(array, "stackrel");
 731                         break;
 732
 733                 case LM_TK_FRAC:
 734                         handle_frac(array, "frac");
 735                         break;
 736
 737                 case LM_TK_SQRT:
 738                 {
 739                         unsigned char c = getuchar(yyis);
 740                         if (c == '[') {
 741                                 MathRootInset * rt = new MathRootInset;
 742                                 mathed_parse(rt->cell(0), FLAG_BRACK_END);
 743                                 mathed_parse(rt->cell(1), FLAG_BRACE | FLAG_BRACE_LAST);
 744                                 array.push_back(rt);
 745                         } else {
 746                                 yyis->putback(c);
 747                                 MathSqrtInset * sq = new MathSqrtInset;
 748                                 mathed_parse(sq->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 749                                 array.push_back(sq);
 750                         }
 751                         break;
 752                 }
 753
 754                 case LM_TK_LEFT:
 755                 {
 756                         int ld = yylex();
 757                         if (ld == LM_TK_SYM)
 758                                 ld = yylval.l->id;
 759                         else if (ld == LM_TK_STR || ld == LM_TK_BOP || ld == LM_TK_SPECIAL)
 760                                 ld = yylval.i;
 761
 762                         MathArray ar;
 763                         mathed_parse(ar, FLAG_RIGHT);
 764
 765                         int rd = yylex();
 766                         if (rd == LM_TK_SYM)
 767                                 rd = yylval.l->id;
 768                         else if (rd == LM_TK_STR || rd == LM_TK_BOP || rd == LM_TK_SPECIAL)
 769                                 rd = yylval.i;
 770
 771                         MathDelimInset * dl = new MathDelimInset(ld, rd);
 772                         dl->setData(ar, 0);
 773                         array.push_back(dl);
 774                         break;
 775                 }
 776
 777                 case LM_TK_RIGHT:
 778                         if (flags & FLAG_RIGHT) {
 779                                 --plevel;
 780                                 return;
 781                         }
 782                         mathPrintError("Unmatched right delimiter");
 783 //        panic = true;
 784                         break;
 785
 786                 case LM_TK_FONT:
 787                         yyvarcode = static_cast<MathTextCodes>(yylval.l->id);
 788                         flags |= (FLAG_BRACE | FLAG_BRACE_FONT);
 789                         break;
 790
 791                 case LM_TK_STY:
 792                 {
 793                         lyxerr[Debug::MATHED] << "LM_TK_STY not implemented\n";
 794                         //MathArray tmp = array;
 795                         //MathSizeInset * p = new MathSizeInset(MathStyles(yylval.l->id));
 796                         //array.push_back(p);
 797                         //mathed_parse(p->cell(0), FLAG_BRACE_FONT);
 798                         break;
 799                 }
 800
 801
 802                 case LM_TK_WIDE:
 803                 {
 804                         MathDecorationInset * sq = new MathDecorationInset(yylval.l->id);
 805                         mathed_parse(sq->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 806                         array.push_back(sq);
 807                         break;
 808                 }
 809
 810                 case LM_TK_ACCENT:
 811                         setAccent(yylval.l->id);
 812                         break;
 813
 814                 case LM_TK_NONUM:
 815                         curr_num = false;
 816                         break;
 817
 818                 case LM_TK_PMOD:
 819                 case LM_TK_FUNC:
 820                         if (accent)
 821                                 array.push_back(t, LM_TC_CONST);
 822                         else
 823                                 array.push_back(new MathFuncInset(yylval.l->name));
 824                         break;
 825
 826                 case LM_TK_FUNCLIM:
 827                         array.push_back(new MathFuncInset(yylval.l->name, LM_OT_FUNCLIM));
 828                         break;
 829
 830                 case LM_TK_UNDEF:
 831                         if (MathMacroTable::hasTemplate(yytext)) {
 832                                 MathMacro * m = MathMacroTable::cloneTemplate(yytext);
 833                                 for (int i = 0; i < m->nargs(); ++i)
 834                                         mathed_parse(m->cell(i), FLAG_BRACE_OPT | FLAG_BRACE_LAST);
 835                                 do_insert(array, m);
 836                                 m->Metrics(LM_ST_TEXT);
 837                         } else
 838                                 do_insert(array, new MathFuncInset(yytext, LM_OT_UNDEF));
 839                         break;
 840
 841                 case LM_TK_END:
 842                         --plevel;
 843                         return;
 844
 845                 case LM_TK_BEGIN:
 846                 {
 847                         int i = yylval.i;
 848                         MathInsetTypes typ = latex_mathenv[i].typ;
 849
 850                         if (typ == LM_OT_MATRIX) {
 851                                 string valign = "\0";
 852                                 unsigned char rg = LexGetArg(0);
 853                                 if (rg == ']') {
 854                                         valign = yytext;
 855                                         rg = LexGetArg('{');
 856                                 }
 857
 858                                 string halign = yytext;
 859                                 MathArrayInset * mm = new MathArrayInset(halign.size(), 1);
 860                                 valign += 'c';
 861                                 mm->valign(valign[0]);
 862                                 mm->halign(halign);
 863
 864                                 mathed_parse_lines(mm, halign.size(), latex_mathenv[i].numbered, false);
 865                                 do_insert(array, mm);
 866                                 //lyxerr << "read matrix " << *mm << "\n";
 867                                 break;
 868                         } else
 869                                 lyxerr[Debug::MATHED] << "unknow math inset " << typ << "\n";
 870                         break;
 871                 }
 872
 873                 case LM_TK_MACRO:
 874                         do_insert(array, MathMacroTable::cloneTemplate(yylval.l->name));
 875                         break;
 876
 877                 case LM_TK_LABEL:
 878                 {
 879                         unsigned char const rg = LexGetArg('\0', true);
 880                         if (rg != '}') {
 881                                 mathPrintError("Expected '{'");
 882                                 // debug info
 883                                 lyxerr[Debug::MATHED] << "[" << yytext << "]" << endl;
 884                                 panic = true;
 885                                 break;
 886                         }
 887                         //lyxerr << " setting label to " << yytext << "\n";
 888                         curr_label = yytext;
 889                         break;
 890                 }
 891
 892                 default:
 893                         mathPrintError("Unrecognized token");
 894                         lyxerr[Debug::MATHED] << "[" << t << " " << yytext << "]" << endl;
 895                         break;
 896
 897                 } // end of big switch
 898
 899                 tprev = t;
 900                 if (panic) {
 901                         lyxerr << " Math Panic, expect problems!" << endl;
 902                         //   Search for the end command.
 903                         do {
 904                                 t = yylex();
 905                         } while (t != LM_TK_END && t);
 906                 } else
 907                         t = yylex();
 908
 909                 if (flags & FLAG_BRACE_OPT) {
 910                         flags &= ~FLAG_BRACE_OPT;
 911                         break;
 912                 }
 913         }
 914         --plevel;
 915 }
 916
 917
 918 MathInset * mathed_parse(istream & is)
 919 {
 920         yyis     = &is;
 921         yylineno = 0;
 922         return mathed_parse();
 923 }
 924
 925
 926 MathInset * mathed_parse(LyXLex & lex)
 927 {
 928         yyis     = &lex.getStream();
 929         yylineno = lex.GetLineNo();
 930
 931         MathInset * p = mathed_parse();
 932
 933         // Update line number
 934         lex.setLineNo(yylineno);
 935
 936         // reading of end_inset
 937         while (lex.IsOK()) {
 938                 lex.nextToken();
 939                 if (lex.GetString() == "\\end_inset")
 940                         break;
 941                 lyxerr[Debug::MATHED] << "InsetFormula::Read: Garbage before \\end_inset,"
 942                         " or missing \\end_inset!" << endl;
 943         }
 944
 945         return p;
 946 }
 947
 948