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