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 // {[(
  19
  20 #include <config.h>
  21
  22 #include <cctype>
  23
  24 #ifdef __GNUG__
  25 #pragma implementation
  26 #endif
  27
  28 #include "math_parser.h"
  29 #include "array.h"
  30 #include "math_inset.h"
  31 #include "math_macro.h"
  32 #include "math_macrotable.h"
  33 #include "math_macrotemplate.h"
  34 #include "math_root.h"
  35 #include "math_arrayinset.h"
  36 #include "math_sqrtinset.h"
  37 #include "math_matrixinset.h"
  38 #include "math_accentinset.h"
  39 #include "math_bigopinset.h"
  40 #include "math_funcinset.h"
  41 #include "math_spaceinset.h"
  42 #include "math_sizeinset.h"
  43 #include "math_scriptinset.h"
  44 #include "math_dotsinset.h"
  45 #include "math_fracinset.h"
  46 #include "math_deliminset.h"
  47 #include "math_decorationinset.h"
  48 #include "debug.h"
  49 #include "mathed/support.h"
  50 #include "lyxlex.h"
  51
  52 using std::istream;
  53 using std::endl;
  54
  55
  56
  57 // These are lexical codes, not semantic
  58 enum lexcode_enum {
  59         LexNone,
  60         LexESC,
  61         LexAlpha,
  62         LexDigit,
  63         LexBOP,         // Binary operators or relations
  64         LexMathSpace,
  65         LexOpen,
  66         LexClose,
  67         LexComment,
  68         LexArgument,
  69         LexSpace,
  70         LexNewLine,
  71         LexOther,
  72         LexSelf
  73 };
  74
  75 lexcode_enum lexcode[256];
  76
  77
  78 char const * latex_special_chars = "#$%&_{}";
  79
  80
  81 namespace {
  82
  83 void mathed_parse(MathArray & array, unsigned flags);
  84
  85 unsigned char getuchar(std::istream * is)
  86 {
  87         char c;
  88         is->get(c);
  89         return static_cast<unsigned char>(c);
  90 }
  91
  92 const unsigned char LM_TK_OPEN  = '{';
  93 const unsigned char LM_TK_CLOSE = '}';
  94
  95 enum {
  96         FLAG_BRACE      = 1 << 0,  //  A { needed              //}
  97         FLAG_BRACE_OPT  = 1 << 2,  //  Optional {              //}
  98         FLAG_BRACE_LAST = 1 << 3,  //  // { Last } ends the parsing process
  99         FLAG_BRACK_ARG  = 1 << 4,  //  Optional [              //]
 100         FLAG_RIGHT      = 1 << 5,  //  Next right ends the parsing process
 101         FLAG_END        = 1 << 6,  //  Next end ends the parsing process
 102         FLAG_BRACE_FONT = 1 << 7,  //  // { Next } closes a font
 103         FLAG_BRACK_END  = 1 << 9,  //  // [ Next ] ends the parsing process
 104         FLAG_AMPERSAND  = 1 << 10, //  Next & ends the parsing process
 105         FLAG_NEWLINE    = 1 << 11, //  Next \\ ends the parsing process
 106
 107         //  Read a (possibly braced token)
 108         FLAG_ITEM       = FLAG_BRACE_OPT | FLAG_BRACE_LAST
 109 };
 110
 111 }
 112
 113
 114 ///
 115 union {
 116         ///
 117         int i;
 118         ///
 119         latexkeys const * l;
 120 } yylval;
 121
 122
 123
 124 string yytext;
 125 int yylineno;
 126 istream * yyis;
 127 MathTextCodes yyvarcode;
 128
 129
 130
 131 struct latex_mathenv_type {
 132         char const *      name;
 133         char const *      basename;
 134         MathInsetTypes    typ;
 135         bool              numbered;
 136         bool              ams;
 137 };
 138
 139 latex_mathenv_type latex_mathenv[] = {
 140         {"math",         "math",         LM_OT_SIMPLE,   0, 0},
 141         {"equation*",    "equation",     LM_OT_EQUATION, 0, 0},
 142         {"equation",     "equation",     LM_OT_EQUATION, 1, 0},
 143         {"eqnarray*",    "eqnarray",     LM_OT_EQNARRAY, 0, 0},
 144         {"eqnarray",     "eqnarray",     LM_OT_EQNARRAY, 1, 0},
 145         {"align*",       "align",        LM_OT_ALIGN,    0, 1},
 146         {"align",        "align",        LM_OT_ALIGN,    1, 1},
 147         {"alignat*",     "alignat",      LM_OT_ALIGNAT,  0, 1},
 148         {"alignat",      "alignat",      LM_OT_ALIGNAT,  1, 1},
 149         {"multline*",    "multline",     LM_OT_MULTLINE, 0, 1},
 150         {"multline",     "multline",     LM_OT_MULTLINE, 1, 1},
 151         {"array",        "array",        LM_OT_MATRIX,   0, 1}
 152 };
 153
 154 int const latex_mathenv_num = sizeof(latex_mathenv)/sizeof(latex_mathenv[0]);
 155
 156
 157
 158 void mathPrintError(string const & msg)
 159 {
 160         lyxerr[Debug::MATHED] << "Line ~" << yylineno << ": Math parse error: " << msg << endl;
 161 }
 162
 163
 164 void LexInitCodes()
 165 {
 166         for (int i = 0; i <= 255; ++i) {
 167                 if (isdigit(i))
 168                         lexcode[i] = LexDigit;
 169                 else if (isspace(i))
 170                         lexcode[i] = LexSpace;
 171                 else
 172                         lexcode[i] = LexAlpha;
 173         }
 174
 175         lexcode['\t'] = lexcode['\f'] = lexcode[' '] = LexSpace;
 176         lexcode['\n'] = LexNewLine;
 177         lexcode['%'] = LexComment;
 178         lexcode['#'] = LexArgument;
 179         lexcode['+'] = lexcode['-'] = lexcode['*'] = lexcode['/']
 180                 = lexcode['<'] = lexcode['>'] = lexcode['='] = LexBOP;
 181
 182         lexcode['!'] = lexcode[','] = lexcode[':']
 183                 = lexcode[';'] = LexMathSpace;
 184
 185         lexcode['('] = lexcode[')'] = lexcode['|'] = lexcode['.'] =
 186                 lexcode['?'] = LexOther;
 187
 188         lexcode['\''] = lexcode['@'] = LexAlpha;
 189
 190         lexcode['['] = lexcode[']'] = lexcode['^'] = lexcode['_'] =
 191                 lexcode['&'] = LexSelf;
 192
 193         lexcode['\\'] = LexESC;
 194         lexcode['{'] = LexOpen;
 195         lexcode['}'] = LexClose;
 196 }
 197
 198
 199 unsigned char LexGetArg(unsigned char lf, bool accept_spaces = false)
 200 {
 201         while (yyis->good()) {
 202                 unsigned char c = getuchar(yyis);
 203                 if (c > ' ') {
 204                         if (!lf)
 205                                 lf = c;
 206                         else if (c != lf) {
 207                                 lyxerr[Debug::MATHED] << "Math parse error: unexpected '" << c << "'" << endl;
 208                                 return '\0';
 209                         }
 210                         break;
 211                 }
 212         }
 213         unsigned char rg = 0;
 214         if (lf == '{') rg = '}';
 215         if (lf == '[') rg = ']';
 216         if (lf == '(') rg = ')';
 217         if (!rg) {
 218                 lyxerr[Debug::MATHED] << "Math parse error: unknown bracket '" << lf << "'" << endl;
 219                 return '\0';
 220         }
 221         yytext.erase();
 222         int bcnt = 1;
 223         do {
 224                 unsigned char c = getuchar(yyis);
 225                 if (c == lf) ++bcnt;
 226                 if (c == rg) --bcnt;
 227                 if ((c > ' ' || (c == ' ' && accept_spaces)) && bcnt > 0)
 228                         yytext += c;
 229         } while (bcnt > 0 && yyis->good());
 230
 231         return rg;
 232 }
 233
 234
 235 int yylex()
 236 {
 237         static bool init_done = false;
 238
 239         if (!init_done) {
 240                 LexInitCodes();
 241                 init_done = true;
 242         }
 243
 244         while (yyis->good()) {
 245                 unsigned char c = getuchar(yyis);
 246                 //lyxerr << "reading byte: '" << c << "' code: " << lexcode[c] << endl;
 247
 248                 if (yyvarcode == LM_TC_TEXTRM && c == ' ') {
 249                         yylval.i = ' ';
 250                         return LM_TK_ALPHA;
 251                 } else if (lexcode[c] == LexNewLine) {
 252                         ++yylineno;
 253                         continue;
 254                 } else if (lexcode[c] == LexComment) {
 255                         do {
 256                                 c = getuchar(yyis);
 257                         } while (c != '\n' && yyis->good());  // eat comments
 258                 } else if (lexcode[c] == LexDigit
 259                            || lexcode[c] == LexOther
 260                            || lexcode[c] == LexMathSpace) {
 261                         yylval.i = c;
 262                         return LM_TK_STR;
 263                 } else if (lexcode[c] == LexAlpha) {
 264                         yylval.i = c;
 265                         return LM_TK_ALPHA;
 266                 } else if (lexcode[c] == LexBOP) {
 267                         yylval.i = c;
 268                         return LM_TK_BOP;
 269                 } else if (lexcode[c] == LexSelf) {
 270                         return c;
 271                 } else if (lexcode[c] == LexArgument) {
 272                         c = getuchar(yyis);
 273                         yylval.i = c - '0';
 274                         return LM_TK_ARGUMENT;
 275                 } else if (lexcode[c] == LexOpen) {
 276                         return LM_TK_OPEN;
 277                 } else if (lexcode[c] == LexClose) {
 278                         return LM_TK_CLOSE;
 279                 } else if (lexcode[c] == LexESC)   {
 280                         c = getuchar(yyis);
 281                         if (c == '\\')  {
 282                                 yylval.i = -1;
 283                                 return LM_TK_NEWLINE;
 284                         }
 285                         if (c == '(') {
 286                                 yylval.i = LM_OT_SIMPLE;
 287                                 return LM_TK_BEGIN;
 288                         }
 289                         if (c == ')') {
 290                                 yylval.i = LM_OT_SIMPLE;
 291                                 return LM_TK_END;
 292                         }
 293                         if (c == '[') {
 294                                 yylval.i = LM_OT_EQUATION;
 295                                 return LM_TK_BEGIN;
 296                         }
 297                         if (c == ']') {
 298                                 yylval.i = LM_OT_EQUATION;
 299                                 return LM_TK_END;
 300                         }
 301                         if (contains(latex_special_chars, c)) {
 302                                 yylval.i = c;
 303                                 return LM_TK_SPECIAL;
 304                         }
 305                         if (lexcode[c] == LexMathSpace) {
 306                                 int i;
 307                                 for (i = 0; i < 4 && static_cast<int>(c) != latex_mathspace[i][0]; ++i)
 308                                         ;
 309                                 yylval.i = (i < 4) ? i : 0;
 310                                 return LM_TK_SPACE;
 311                         }
 312                         if (lexcode[c] == LexAlpha) {
 313                                 yytext.erase();
 314                                 while (lexcode[c] == LexAlpha) {
 315                                         yytext += c;
 316                                         c = getuchar(yyis);
 317                                 }
 318                                 if (yyis->good())
 319                                         yyis->putback(c);
 320                                 lyxerr[Debug::MATHED] << "reading: text '" << yytext << "'\n";
 321                                 latexkeys const * l = in_word_set(yytext);
 322                                 if (!l)
 323                                         return LM_TK_UNDEF;
 324
 325                                 if (l->token == LM_TK_BEGIN || l->token == LM_TK_END) {
 326                                         LexGetArg('{');
 327                                         int i = 0;
 328                                         while (i < latex_mathenv_num && yytext != latex_mathenv[i].name)
 329                                                  ++i;
 330                                         yylval.i = i;
 331                                 } else if (l->token == LM_TK_SPACE)
 332                                         yylval.i = l->id;
 333                                 else
 334                                         yylval.l = l;
 335                                 return l->token;
 336                         }
 337                 }
 338         }
 339         return 0;
 340 }
 341
 342
 343 MathInset * lastUpDownInset(MathArray & array, bool up, bool down)
 344 {
 345         MathInset * p = array.back_inset();
 346         if (!p || !p->isUpDownInset()) {
 347                 p = new MathScriptInset(up, down);
 348                 array.push_back(p);
 349         }
 350         MathUpDownInset * q = static_cast<MathScriptInset *>(p);
 351         if (up)
 352                 q->up(true);
 353         if (down)
 354                 q->down(down);
 355         return p;
 356 }
 357
 358
 359 MathBigopInset * lastBigopInset(MathArray & array)
 360 {
 361         MathInset * p = array.back_inset();
 362         return (p && p->isBigopInset()) ? static_cast<MathBigopInset *>(p) : 0;
 363 }
 364
 365
 366
 367 static bool   curr_num;
 368 static string curr_label;
 369
 370 void mathed_parse_lines(MathInset * inset, int col, bool numbered, bool outmost)
 371 {
 372         // save global variables
 373         bool   saved_num   = curr_num;
 374         string saved_label = curr_label;
 375
 376         MathGridInset * p = static_cast<MathGridInset *>(inset);
 377         for (int row = 0; true; ++row) {
 378                 // reset global variables
 379                 curr_num   = numbered;
 380                 curr_label = string();
 381
 382                 // reading a row
 383                 int idx = p->nargs() - p->ncols();
 384                 for (int i = 0; i < col - 1; ++i, ++idx)
 385                         mathed_parse(p->cell(idx), FLAG_AMPERSAND);
 386                 mathed_parse(p->cell(idx), FLAG_NEWLINE | FLAG_END);
 387
 388                 if (outmost) {
 389                         MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
 390                         m->numbered(row, curr_num);
 391                         m->label(row, curr_label);
 392                 }
 393
 394                 // Hack!
 395                 // no newline
 396                 if (yylval.i != -1)
 397                         break;
 398
 399                 p->appendRow();
 400         }
 401
 402         // restore global variables
 403         curr_num   = saved_num;
 404         curr_label = saved_label;
 405 }
 406
 407
 408 MathInset * mathed_parse()
 409 {
 410         MathInset * p = 0;
 411         int t = yylex();
 412
 413         switch (t) {
 414                 case LM_TK_NEWCOMMAND: {
 415                         LexGetArg('{');
 416                         string name = yytext.substr(1);
 417
 418                         int na = 0;
 419                         unsigned char const c = yyis->peek();
 420                         if (c == '[') {
 421                                 LexGetArg('[');
 422                                 na = atoi(yytext.c_str());
 423                         }
 424
 425                         p = new MathMacroTemplate(name, na);
 426                         mathed_parse(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 427                         lyxerr[Debug::MATHED] << "LM_TK_NEWCOMMAND: name: " << name << " na: " << na << "\n";
 428                         break;
 429                 }
 430
 431                 case LM_TK_BEGIN: {
 432                         int i = yylval.i;
 433                         lyxerr[Debug::MATHED] << "reading math environment " << i << " "
 434                                 << latex_mathenv[i].name << "\n";
 435
 436                         MathInsetTypes typ = latex_mathenv[i].typ;
 437                         p = new MathMatrixInset(typ);
 438                         switch (typ) {
 439
 440                                 case LM_OT_SIMPLE: {
 441                                         curr_num   = latex_mathenv[i].numbered;
 442                                         curr_label = string();
 443                                         mathed_parse(p->cell(0), 0);
 444                                         MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
 445                                         m->numbered(0, curr_num);
 446                                         m->label(0, curr_label);
 447                                         break;
 448                                 }
 449
 450                                 case LM_OT_EQUATION: {
 451                                         curr_num   = latex_mathenv[i].numbered;
 452                                         curr_label = string();
 453                                         mathed_parse(p->cell(0), FLAG_END);
 454                                         MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
 455                                         m->numbered(0, curr_num);
 456                                         m->label(0, curr_label);
 457                                         break;
 458                                 }
 459
 460                                 case LM_OT_EQNARRAY: {
 461                                         mathed_parse_lines(p, 3, latex_mathenv[i].numbered, true);
 462                                         break;
 463                                 }
 464
 465                                 case LM_OT_ALIGNAT: {
 466                                         LexGetArg('{');
 467                                         //int c = atoi(yytext.c_str());
 468                                         lyxerr[Debug::MATHED] << "LM_OT_ALIGNAT: not implemented\n";
 469                                         mathed_parse_lines(p, 2, latex_mathenv[i].numbered, true);
 470                                         lyxerr[Debug::MATHED] << "LM_OT_ALIGNAT: par: " << *p << "\n";
 471                                         break;
 472                                 }
 473
 474                                 default:
 475                                         lyxerr[Debug::MATHED] << "1: unknown math environment: " << typ << "\n";
 476                         }
 477
 478                         p->SetName(latex_mathenv[i].basename);
 479
 480                         break;
 481                 }
 482
 483                 default:
 484                         lyxerr[Debug::MATHED] << "2 unknown math environment: " << t << "\n";
 485         }
 486
 487         return p;
 488 }
 489
 490
 491
 492 namespace {
 493
 494 void handle_frac(MathArray & array, string const & name)
 495 {
 496         MathFracInset * p = new MathFracInset(name);
 497         mathed_parse(p->cell(0), FLAG_ITEM);
 498         mathed_parse(p->cell(1), FLAG_ITEM);
 499         array.push_back(p);
 500 }
 501
 502
 503 void mathed_parse(MathArray & array, unsigned flags)
 504 {
 505         int  t = yylex();
 506         bool panic = false;
 507         static int plevel = -1;
 508         yyvarcode = LM_TC_VAR;
 509
 510         int brace = 0;
 511
 512         ++plevel;
 513         while (t) {
 514                 //lyxerr << "t: " << t << " flags: " << flags;
 515                 //array.dump(lyxerr);
 516                 //lyxerr << "\n";
 517
 518                 if ((flags & FLAG_BRACE) && t != LM_TK_OPEN) {
 519                         if (!(flags & FLAG_BRACK_ARG) || t != '[') {
 520                                 mathPrintError(
 521                                         "Expected {. Maybe you forgot to enclose an argument in {}");
 522                                 panic = true;
 523                                 break;
 524                         }
 525                 }
 526
 527                 switch (t) {
 528
 529                 case LM_TK_ALPHA:
 530                         array.push_back(yylval.i, yyvarcode);
 531                         break;
 532
 533                 case LM_TK_ARGUMENT:
 534                         array.push_back(new MathMacroArgument(yylval.i));
 535                         break;
 536
 537                 case LM_TK_SPECIAL:
 538                         array.push_back(yylval.i, LM_TC_SPECIAL);
 539                         break;
 540
 541                 case LM_TK_STR:
 542                         array.push_back(yylval.i, LM_TC_CONST);
 543                         break;
 544
 545                 case LM_TK_OPEN:
 546                         ++brace;
 547                         if (flags & FLAG_BRACE_OPT) {
 548                                 flags &= ~FLAG_BRACE_OPT;
 549                                 flags |= FLAG_BRACE;
 550                         }
 551
 552                         if (flags & FLAG_BRACE)
 553                                 flags &= ~FLAG_BRACE;
 554                         else
 555                                 array.push_back('{', LM_TC_TEX);
 556                         break;
 557
 558                 case LM_TK_CLOSE:
 559                         --brace;
 560                         if (brace < 0) {
 561                                 mathPrintError("Unmatching braces");
 562                                 panic = true;
 563                                 break;
 564                         }
 565                         if (flags & FLAG_BRACE_FONT) {
 566                                 yyvarcode = LM_TC_VAR;
 567                                 flags &= ~FLAG_BRACE_FONT;
 568                                 break;
 569                         }
 570                         if (brace == 0 && (flags & FLAG_BRACE_LAST)) {
 571                                 --plevel;
 572                                 return;
 573                         }
 574                         array.push_back('}', LM_TC_TEX);
 575                         break;
 576
 577                 case '[':
 578                         if (flags & FLAG_BRACK_ARG) {
 579                                 flags &= ~FLAG_BRACK_ARG;
 580                                 unsigned char const rg = LexGetArg('[');
 581                                 if (rg != ']') {
 582                                         mathPrintError("Expected ']'");
 583                                         panic = true;
 584                                         break;
 585                                 }
 586                         } else
 587                                 array.push_back('[', LM_TC_CONST);
 588                         break;
 589
 590                 case ']':
 591                         if (flags & FLAG_BRACK_END) {
 592                                 --plevel;
 593                                 return;
 594                         }
 595                         array.push_back(']', LM_TC_CONST);
 596                         break;
 597
 598                 case '^':
 599                         mathed_parse(lastUpDownInset(array, true, false)->cell(0), FLAG_ITEM);
 600                         break;
 601
 602                 case '_':
 603                         mathed_parse(lastUpDownInset(array, false, true)->cell(1), FLAG_ITEM);
 604                         break;
 605
 606                 case LM_TK_LIMIT:
 607                 {
 608                         MathBigopInset * p = lastBigopInset(array);
 609                         if (p)
 610                                 p->limits(yylval.l->id ? 1 : -1);
 611                         break;
 612                 }
 613
 614                 case '&':
 615                 {
 616                         if (flags & FLAG_AMPERSAND) {
 617                                 flags &= ~FLAG_AMPERSAND;
 618                                 --plevel;
 619                                 return;
 620                         }
 621                         lyxerr[Debug::MATHED] << "found tab unexpectedly, array: '" << array << "'\n";
 622                         break;
 623                 }
 624
 625                 case LM_TK_NEWLINE:
 626                 {
 627                         if (flags & FLAG_NEWLINE) {
 628                                 flags &= ~FLAG_NEWLINE;
 629                                 --plevel;
 630                                 return;
 631                         }
 632                         lyxerr[Debug::MATHED] << "found newline unexpectedly, array: '" << array << "'\n";
 633                         break;
 634                 }
 635
 636                 case LM_TK_BIGSYM:
 637                 {
 638                         array.push_back(new MathBigopInset(yylval.l->name, yylval.l->id));
 639                         break;
 640                 }
 641
 642                 case LM_TK_SYM:
 643                         if (yylval.l->id < 256) {
 644                                 MathTextCodes tc = MathIsBOPS(yylval.l->id) ? LM_TC_BOPS: LM_TC_SYMB;
 645                                 array.push_back(yylval.l->id, tc);
 646                         } else
 647                                 array.push_back(new MathFuncInset(yylval.l->name));
 648                         break;
 649
 650                 case LM_TK_BOP:
 651                         array.push_back(yylval.i, LM_TC_BOP);
 652                         break;
 653
 654                 case LM_TK_SPACE:
 655                         if (yylval.i >= 0)
 656                                 array.push_back(new MathSpaceInset(yylval.i));
 657                         break;
 658
 659                 case LM_TK_DOTS:
 660                         array.push_back(new MathDotsInset(yylval.l->name, yylval.l->id));
 661                         break;
 662
 663                 case LM_TK_CHOOSE:
 664                         handle_frac(array, "atop");
 665                         break;
 666
 667                 case LM_TK_STACK:
 668                         handle_frac(array, "stackrel");
 669                         break;
 670
 671                 case LM_TK_FRAC:
 672                         handle_frac(array, "frac");
 673                         break;
 674
 675                 case LM_TK_SQRT:
 676                 {
 677                         unsigned char c = getuchar(yyis);
 678                         if (c == '[') {
 679                                 array.push_back(new MathRootInset);
 680                                 mathed_parse(array.back_inset()->cell(0), FLAG_BRACK_END);
 681                                 mathed_parse(array.back_inset()->cell(1), FLAG_ITEM);
 682                         } else {
 683                                 yyis->putback(c);
 684                                 array.push_back(new MathSqrtInset);
 685                                 mathed_parse(array.back_inset()->cell(0), FLAG_ITEM);
 686                         }
 687                         break;
 688                 }
 689
 690                 case LM_TK_LEFT:
 691                 {
 692                         int ld = yylex();
 693                         if (ld == LM_TK_SYM)
 694                                 ld = yylval.l->id;
 695                         else if (ld == LM_TK_STR || ld == LM_TK_BOP || ld == LM_TK_SPECIAL)
 696                                 ld = yylval.i;
 697
 698                         MathArray ar;
 699                         mathed_parse(ar, FLAG_RIGHT);
 700
 701                         int rd = yylex();
 702                         if (rd == LM_TK_SYM)
 703                                 rd = yylval.l->id;
 704                         else if (rd == LM_TK_STR || rd == LM_TK_BOP || rd == LM_TK_SPECIAL)
 705                                 rd = yylval.i;
 706
 707                         MathDelimInset * dl = new MathDelimInset(ld, rd);
 708                         dl->cell(0) = ar;
 709                         array.push_back(dl);
 710                         break;
 711                 }
 712
 713                 case LM_TK_RIGHT:
 714                         if (flags & FLAG_RIGHT) {
 715                                 --plevel;
 716                                 return;
 717                         }
 718                         mathPrintError("Unmatched right delimiter");
 719 //        panic = true;
 720                         break;
 721
 722                 case LM_TK_FONT:
 723                         yyvarcode = static_cast<MathTextCodes>(yylval.l->id);
 724                         flags |= (FLAG_BRACE | FLAG_BRACE_FONT);
 725                         break;
 726
 727                 case LM_TK_STY:
 728                 {
 729                         lyxerr[Debug::MATHED] << "LM_TK_STY not implemented\n";
 730                         //MathArray tmp = array;
 731                         //MathSizeInset * p = new MathSizeInset(MathStyles(yylval.l->id));
 732                         //array.push_back(p);
 733                         //mathed_parse(p->cell(0), FLAG_BRACE_FONT);
 734                         break;
 735                 }
 736
 737
 738                 case LM_TK_WIDE:
 739                 {
 740                         MathDecorationInset * p = new MathDecorationInset(yylval.l->id);
 741                         mathed_parse(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 742                         array.push_back(p);
 743                         break;
 744                 }
 745
 746                 case LM_TK_ACCENT:
 747                 {
 748                         MathAccentInset * p = new MathAccentInset(yylval.l->id);
 749                         mathed_parse(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 750                         array.push_back(p);
 751                         break;
 752                 }
 753
 754                 case LM_TK_NONUM:
 755                         curr_num = false;
 756                         break;
 757
 758                 case LM_TK_PMOD:
 759                 case LM_TK_FUNC:
 760                         //if (accent)
 761                         //      array.push_back(t, LM_TC_CONST);
 762                         //else
 763                                 array.push_back(new MathFuncInset(yylval.l->name));
 764                         break;
 765
 766                 case LM_TK_FUNCLIM:
 767                         array.push_back(new MathFuncInset(yylval.l->name, LM_OT_FUNCLIM));
 768                         break;
 769
 770                 case LM_TK_UNDEF:
 771                         if (MathMacroTable::hasTemplate(yytext)) {
 772                                 MathMacro * m = MathMacroTable::cloneTemplate(yytext);
 773                                 for (int i = 0; i < m->nargs(); ++i)
 774                                         mathed_parse(m->cell(i), FLAG_ITEM);
 775                                 array.push_back(m);
 776                                 m->Metrics(LM_ST_TEXT);
 777                         } else
 778                                 array.push_back(new MathFuncInset(yytext, LM_OT_UNDEF));
 779                         break;
 780
 781                 case LM_TK_END:
 782                         --plevel;
 783                         return;
 784
 785                 case LM_TK_BEGIN:
 786                 {
 787                         int i = yylval.i;
 788                         MathInsetTypes typ = latex_mathenv[i].typ;
 789
 790                         if (typ == LM_OT_MATRIX) {
 791                                 string valign = "\0";
 792                                 unsigned char rg = LexGetArg(0);
 793                                 if (rg == ']') {
 794                                         valign = yytext;
 795                                         rg = LexGetArg('{');
 796                                 }
 797
 798                                 string halign = yytext;
 799                                 MathArrayInset * mm = new MathArrayInset(halign.size(), 1);
 800                                 valign += 'c';
 801                                 mm->valign(valign[0]);
 802                                 mm->halign(halign);
 803
 804                                 mathed_parse_lines(mm, halign.size(), latex_mathenv[i].numbered, false);
 805                                 array.push_back(mm);
 806                                 //lyxerr << "read matrix " << *mm << "\n";
 807                                 break;
 808                         } else
 809                                 lyxerr[Debug::MATHED] << "unknow math inset " << typ << "\n";
 810                         break;
 811                 }
 812
 813                 case LM_TK_MACRO:
 814                         array.push_back(MathMacroTable::cloneTemplate(yylval.l->name));
 815                         break;
 816
 817                 case LM_TK_LABEL:
 818                 {
 819                         unsigned char const rg = LexGetArg('\0', true);
 820                         if (rg != '}') {
 821                                 mathPrintError("Expected '{'");
 822                                 // debug info
 823                                 lyxerr[Debug::MATHED] << "[" << yytext << "]" << endl;
 824                                 panic = true;
 825                                 break;
 826                         }
 827                         //lyxerr << " setting label to " << yytext << "\n";
 828                         curr_label = yytext;
 829                         break;
 830                 }
 831
 832                 default:
 833                         mathPrintError("Unrecognized token");
 834                         lyxerr[Debug::MATHED] << "[" << t << " " << yytext << "]" << endl;
 835                         break;
 836
 837                 } // end of big switch
 838
 839                 if (panic) {
 840                         lyxerr << " Math Panic, expect problems!" << endl;
 841                         //   Search for the end command.
 842                         do {
 843                                 t = yylex();
 844                         } while (t != LM_TK_END && t);
 845                 } else
 846                         t = yylex();
 847
 848                 if (flags & FLAG_BRACE_OPT) {
 849                         flags &= ~FLAG_BRACE_OPT;
 850                         break;
 851                 }
 852         }
 853         --plevel;
 854 }
 855
 856 }
 857
 858
 859 MathInset * mathed_parse(istream & is)
 860 {
 861         yyis     = &is;
 862         yylineno = 0;
 863         return mathed_parse();
 864 }
 865
 866
 867 MathInset * mathed_parse(LyXLex & lex)
 868 {
 869         yyis     = &lex.getStream();
 870         yylineno = lex.GetLineNo();
 871
 872         MathInset * p = mathed_parse();
 873
 874         // Update line number
 875         lex.setLineNo(yylineno);
 876
 877         // reading of end_inset
 878         while (lex.IsOK()) {
 879                 lex.nextToken();
 880                 if (lex.GetString() == "\\end_inset")
 881                         break;
 882                 lyxerr[Debug::MATHED] << "InsetFormula::Read: Garbage before \\end_inset,"
 883                         " or missing \\end_inset!" << endl;
 884         }
 885
 886         return p;
 887 }
 888
 889 //]})