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