src/mathed/math_parser.C

   1 /*
   2  *  File:        math_parser.C
   3  *  Purpose:     Parser for mathed
   4  *  Author:      Alejandro Aguilar Sierra <asierra@servidor.unam.mx>
   5  *  Created:     January 1996
   6  *  Description: Parse LaTeX2e math mode code.
   7  *
   8  *  Dependencies: Xlib, XForms
   9  *
  10  *  Copyright: 1996, Alejandro Aguilar Sierra
  11  *
  12  *   Version: 0.8beta.
  13  *
  14  *   You are free to use and modify this code under the terms of
  15  *   the GNU General Public Licence version 2 or later.
  16  */
  17
  18 #include <config.h>
  19
  20 #include <cctype>
  21
  22 #ifdef __GNUG__
  23 #pragma implementation
  24 #endif
  25
  26 #include "math_parser.h"
  27 #include "array.h"
  28 #include "math_inset.h"
  29 #include "math_arrayinset.h"
  30 #include "math_bigopinset.h"
  31 #include "math_charinset.h"
  32 #include "math_dotsinset.h"
  33 #include "math_decorationinset.h"
  34 #include "math_deliminset.h"
  35 #include "math_fracinset.h"
  36 #include "math_funcinset.h"
  37 #include "math_funcliminset.h"
  38 #include "math_macro.h"
  39 #include "math_macrotable.h"
  40 #include "math_macrotemplate.h"
  41 #include "math_matrixinset.h"
  42 #include "math_noglyphinset.h"
  43 #include "math_rootinset.h"
  44 #include "math_scriptinset.h"
  45 #include "math_sizeinset.h"
  46 #include "math_spaceinset.h"
  47 #include "math_sqrtinset.h"
  48 #include "math_stackrelinset.h"
  49 #include "math_symbolinset.h"
  50 #include "debug.h"
  51 #include "mathed/support.h"
  52 #include "lyxlex.h"
  53 #include "support/lstrings.h"
  54
  55 using std::istream;
  56 using std::endl;
  57
  58
  59 namespace {
  60
  61 MathScriptInset * prevScriptInset(MathArray const & array)
  62 {
  63         MathInset * p = array.back();
  64         return (p && p->isScriptInset()) ? static_cast<MathScriptInset *>(p) : 0;
  65 }
  66
  67
  68 MathInset * lastScriptInset(MathArray & array, bool up, bool down, int limits)
  69 {
  70         MathScriptInset * p = prevScriptInset(array);
  71         if (!p) {
  72                 MathInset * b = array.back();
  73                 if (b && b->isScriptable()) {
  74                         p = new MathScriptInset(up, down, b->clone());
  75                         array.pop_back();
  76                 } else {
  77                         p = new MathScriptInset(up, down);
  78                 }
  79                 array.push_back(p);
  80         }
  81         if (up)
  82                 p->up(true);
  83         if (down)
  84                 p->down(down);
  85         if (limits)
  86                 p->limits(limits);
  87         return p;
  88 }
  89
  90
  91 // These are lexical codes, not semantic
  92 enum lexcode_enum {
  93         LexNone,
  94         LexESC,
  95         LexAlpha,
  96         LexBOP,         // Binary operators or relations
  97         LexOpen,
  98         LexClose,
  99         LexComment,
 100         LexArgument,
 101         LexSpace,
 102         LexNewLine,
 103         LexOther,
 104         LexMath,
 105         LexSelf
 106 };
 107
 108 lexcode_enum lexcode[256];
 109
 110
 111 const unsigned char LM_TK_OPEN  = '{';
 112 const unsigned char LM_TK_CLOSE = '}';
 113
 114 enum {
 115         FLAG_BRACE      = 1 << 0,  //  A { needed              //}
 116         FLAG_BRACE_LAST = 1 << 1,  //  // { Last } ends the parsing process
 117         FLAG_RIGHT      = 1 << 2,  //  Next right ends the parsing process
 118         FLAG_END        = 1 << 3,  //  Next end ends the parsing process
 119         FLAG_BRACE_FONT = 1 << 4,  //  // { Next } closes a font
 120         FLAG_BRACK_END  = 1 << 5,  //  // [ Next ] ends the parsing process
 121         FLAG_AMPERSAND  = 1 << 6,  //  Next & ends the parsing process
 122         FLAG_NEWLINE    = 1 << 7,  //  Next \\ ends the parsing process
 123         FLAG_ITEM       = 1 << 8,  //  read a (possibly braced token)
 124         FLAG_LEAVE      = 1 << 9,  //  marker for leaving the
 125         FLAG_OPTARG     = 1 << 10  //  reads an argument in []
 126 };
 127
 128
 129 struct latex_mathenv_type {
 130         char const *      name;
 131         char const *      basename;
 132         MathInsetTypes    typ;
 133         bool              numbered;
 134         bool              ams;
 135 };
 136
 137 latex_mathenv_type latex_mathenv[] = {
 138         {"math",         "math",         LM_OT_SIMPLE,   0, 0},
 139         {"equation*",    "equation",     LM_OT_EQUATION, 0, 0},
 140         {"equation",     "equation",     LM_OT_EQUATION, 1, 0},
 141         {"eqnarray*",    "eqnarray",     LM_OT_EQNARRAY, 0, 0},
 142         {"eqnarray",     "eqnarray",     LM_OT_EQNARRAY, 1, 0},
 143         {"align*",       "align",        LM_OT_ALIGN,    0, 1},
 144         {"align",        "align",        LM_OT_ALIGN,    1, 1},
 145         {"alignat*",     "alignat",      LM_OT_ALIGNAT,  0, 1},
 146         {"alignat",      "alignat",      LM_OT_ALIGNAT,  1, 1},
 147         {"multline*",    "multline",     LM_OT_MULTLINE, 0, 1},
 148         {"multline",     "multline",     LM_OT_MULTLINE, 1, 1},
 149         {"array",        "array",        LM_OT_MATRIX,   0, 1}
 150 };
 151
 152 int const latex_mathenv_num = sizeof(latex_mathenv)/sizeof(latex_mathenv[0]);
 153
 154
 155
 156 void lexInit()
 157 {
 158         for (int i = 0; i <= 255; ++i) {
 159                 if (isdigit(i))
 160                         lexcode[i] = LexOther;
 161                 else if (isspace(i))
 162                         lexcode[i] = LexSpace;
 163                 else
 164                         lexcode[i] = LexAlpha;
 165         }
 166
 167         lexcode['\t'] = lexcode['\f'] = lexcode[' '] = LexSpace;
 168         lexcode['\n'] = LexNewLine;
 169         lexcode['%'] = LexComment;
 170         lexcode['#'] = LexArgument;
 171         lexcode['$'] = LexMath;
 172         lexcode['+'] = lexcode['-'] = lexcode['*'] = lexcode['/']
 173                 = lexcode['<'] = lexcode['>'] = lexcode['='] = LexBOP;
 174
 175         lexcode['('] = lexcode[')'] = lexcode['|'] = lexcode['.'] =
 176                 lexcode['?'] = LexOther;
 177
 178         lexcode['\''] = lexcode['@'] = LexAlpha;
 179
 180         lexcode['['] = lexcode[']'] = lexcode['^'] = lexcode['_'] =
 181                 lexcode['&'] = LexSelf;
 182
 183         lexcode['\\'] = LexESC;
 184         lexcode['{'] = LexOpen;
 185         lexcode['}'] = LexClose;
 186 }
 187
 188
 189
 190 //
 191 // Helper class for parsing
 192 //
 193
 194
 195 class Parser {
 196 public:
 197         ///
 198         Parser(LyXLex & lex) : is_(lex.getStream()), lineno_(lex.getLineNo()) {}
 199         ///
 200         Parser(istream & is) : is_(is), lineno_(0) {}
 201
 202         ///
 203         MathMacroTemplate * parse_macro();
 204         ///
 205         MathMatrixInset * parse_normal();
 206         ///
 207         void parse_into(MathArray & array, unsigned flags);
 208         ///
 209         int lineno() const { return lineno_; }
 210
 211 private:
 212         ///
 213         int yylex();
 214         ///
 215         string lexArg(unsigned char lf, bool accept_spaces = false);
 216         ///
 217         unsigned char getuchar();
 218         ///
 219         void error(string const & msg);
 220         ///
 221         void parse_lines(MathGridInset * p, int col, bool numbered, bool outmost);
 222         ///
 223         latexkeys const * read_delim();
 224
 225 private:
 226         ///
 227         istream & is_;
 228         ///
 229         int lineno_;
 230
 231         ///
 232         int ival_;
 233         ///
 234         latexkeys const * lval_;
 235         ///
 236         string sval_;
 237
 238         ///
 239         bool   curr_num_;
 240         //
 241         string curr_label_;
 242 };
 243
 244
 245 unsigned char Parser::getuchar()
 246 {
 247         char c = 0;
 248         is_.get(c);
 249         if (!is_.good())
 250                 lyxerr << "The input stream is not well..." << endl;
 251         return static_cast<unsigned char>(c);
 252 }
 253
 254
 255 string Parser::lexArg(unsigned char lf, bool accept_spaces = false)
 256 {
 257         string result;
 258         unsigned char c = 0;
 259         while (is_.good()) {
 260                 c = getuchar();
 261                 if (!isspace(c))
 262                         break;
 263         }
 264
 265         if (c != lf) {
 266                 is_.putback(c);
 267                 return result;
 268         }
 269
 270         unsigned char rg = 0;
 271         if (lf == '{') rg = '}';
 272         if (lf == '[') rg = ']';
 273         if (lf == '(') rg = ')';
 274         if (!rg) {
 275                 lyxerr[Debug::MATHED] << "Math parse error: unknown bracket '"
 276                         << lf << "'" << endl;
 277                 return result;
 278         }
 279
 280         int depth = 1;
 281         do {
 282                 unsigned char c = getuchar();
 283                 if (c == lf)
 284                         ++depth;
 285                 if (c == rg)
 286                         --depth;
 287                 if ((!isspace(c) || (c == ' ' && accept_spaces)) && depth > 0)
 288                         result += c;
 289         } while (depth > 0 && is_.good());
 290
 291         return result;
 292 }
 293
 294
 295 int Parser::yylex()
 296 {
 297         static bool init_done = false;
 298
 299         if (!init_done) {
 300                 lexInit();
 301                 init_done = true;
 302         }
 303
 304         while (is_.good()) {
 305                 unsigned char c = getuchar();
 306                 //lyxerr << "reading byte: '" << c << "' code: " << lexcode[c] << endl;
 307
 308                 if (lexcode[c] == LexNewLine) {
 309                         ++lineno_;
 310                         continue;
 311                 } else if (lexcode[c] == LexComment) {
 312                         do {
 313                                 c = getuchar();
 314                         } while (c != '\n' && is_.good());  // eat comments
 315                 } else if (lexcode[c] == LexOther) {
 316                         ival_ = c;
 317                         return LM_TK_STR;
 318                 } else if (lexcode[c] == LexAlpha || lexcode[c] == LexSpace) {
 319                         ival_ = c;
 320                         return LM_TK_ALPHA;
 321                 } else if (lexcode[c] == LexBOP) {
 322                         ival_ = c;
 323                         return LM_TK_BOP;
 324                 } else if (lexcode[c] == LexMath) {
 325                         ival_ = 0;
 326                         return LM_TK_MATH;
 327                 } else if (lexcode[c] == LexSelf) {
 328                         return c;
 329                 } else if (lexcode[c] == LexArgument) {
 330                         c = getuchar();
 331                         ival_ = c - '0';
 332                         return LM_TK_ARGUMENT;
 333                 } else if (lexcode[c] == LexOpen) {
 334                         return LM_TK_OPEN;
 335                 } else if (lexcode[c] == LexClose) {
 336                         return LM_TK_CLOSE;
 337                 } else if (lexcode[c] == LexESC)   {
 338                         c = getuchar();
 339                         //lyxerr << "reading second byte: '" << c << "' code: " << lexcode[c] << endl;
 340                         string s;
 341                         s += c;
 342                         latexkeys const * l = in_word_set(s);
 343                         if (l) {
 344                                 //lyxerr << "found key: " << l << endl;
 345                                 //lyxerr << "found key name: " << l->name << endl;
 346                                 //lyxerr << "found key token: " << l->token << endl;
 347                                 lval_ = l;
 348                                 ival_ = l->id;
 349                                 return l->token;
 350                         }
 351                         if (lexcode[c] == LexAlpha) {
 352                                 sval_.erase();
 353                                 while (lexcode[c] == LexAlpha && is_.good()) {
 354                                         sval_ += c;
 355                                         c = getuchar();
 356                                 }
 357                                 while (lexcode[c] == LexSpace && is_.good())
 358                                         c = getuchar();
 359                                 if (lexcode[c] != LexSpace)
 360                                         is_.putback(c);
 361
 362                                 //lyxerr[Debug::MATHED] << "reading: text '" << sval_ << "'\n";
 363                                 //lyxerr << "reading: text '" << sval_ << "'\n";
 364                                 latexkeys const * l = in_word_set(sval_);
 365                                 if (!l)
 366                                         return LM_TK_UNDEF;
 367
 368                                 if (l->token == LM_TK_BEGIN || l->token == LM_TK_END) {
 369                                         string name = lexArg('{');
 370                                         int i = 0;
 371                                         while (i < latex_mathenv_num && name != latex_mathenv[i].name)
 372                                                  ++i;
 373                                         ival_ = i;
 374                                 } else if (l->token == LM_TK_SPACE)
 375                                         ival_ = l->id;
 376                                 else
 377                                         lval_ = l;
 378                                 return l->token;
 379                         }
 380                 }
 381         }
 382         return 0;
 383 }
 384
 385
 386 void Parser::error(string const & msg)
 387 {
 388         lyxerr << "Line ~" << lineno_ << ": Math parse error: " << msg << endl;
 389 }
 390
 391
 392 void Parser::parse_lines(MathGridInset * p, int col, bool numbered, bool outmost)
 393 {
 394         // save global variables
 395         bool   const saved_num   = curr_num_;
 396         string const saved_label = curr_label_;
 397
 398         for (int row = 0; true; ++row) {
 399                 // reset global variables
 400                 curr_num_   = numbered;
 401                 curr_label_.erase();
 402
 403                 // reading a row
 404                 int idx = p->nargs() - p->ncols();
 405                 for (int i = 0; i < col - 1; ++i, ++idx)
 406                         parse_into(p->cell(idx), FLAG_AMPERSAND);
 407                 parse_into(p->cell(idx), FLAG_NEWLINE | FLAG_END);
 408
 409                 if (outmost) {
 410                         MathMatrixInset * m = static_cast<MathMatrixInset *>(p);
 411                         m->numbered(row, curr_num_);
 412                         m->label(row, curr_label_);
 413                 }
 414
 415 #ifdef WITH_WARNINGS
 416 #warning Hack!
 417 #endif
 418                 // no newline
 419                 if (ival_ != -1)
 420                         break;
 421
 422                 p->appendRow();
 423         }
 424
 425         // restore "global" variables
 426         curr_num_   = saved_num;
 427         curr_label_ = saved_label;
 428 }
 429
 430
 431 MathMacroTemplate * Parser::parse_macro()
 432 {
 433         if (yylex() != LM_TK_NEWCOMMAND) {
 434                 lyxerr << "\\newcommand expected\n";
 435                 return 0;
 436         }
 437
 438         string name = lexArg('{').substr(1);
 439         string arg  = lexArg('[');
 440         int    narg = arg.empty() ? 0 : atoi(arg.c_str());
 441         MathMacroTemplate * p = new MathMacroTemplate(name, narg);
 442         parse_into(p->cell(0), FLAG_BRACE | FLAG_BRACE_LAST);
 443         return p;
 444 }
 445
 446
 447 MathMatrixInset * Parser::parse_normal()
 448 {
 449         MathMatrixInset * p = 0;
 450         int t = yylex();
 451
 452         switch (t) {
 453                 case LM_TK_MATH:
 454                 case LM_TK_BEGIN: {
 455                         int i = ival_;
 456                         lyxerr[Debug::MATHED]
 457                                 << "reading math environment " << i << " "
 458                                 << latex_mathenv[i].name << "\n";
 459
 460                         MathInsetTypes typ = latex_mathenv[i].typ;
 461                         p = new MathMatrixInset(typ);
 462
 463                         switch (typ) {
 464
 465                                 case LM_OT_SIMPLE: {
 466                                         curr_num_ = latex_mathenv[i].numbered;
 467                                         curr_label_.erase();
 468                                         parse_into(p->cell(0), 0);
 469                                         p->numbered(0, curr_num_);
 470                                         p->label(0, curr_label_);
 471                                         break;
 472                                 }
 473
 474                                 case LM_OT_EQUATION: {
 475                                         curr_num_ = latex_mathenv[i].numbered;
 476                                         curr_label_.erase();
 477                                         parse_into(p->cell(0), FLAG_END);
 478                                         p->numbered(0, curr_num_);
 479                                         p->label(0, curr_label_);
 480                                         break;
 481                                 }
 482
 483                                 case LM_OT_EQNARRAY: {
 484                                         parse_lines(p, 3, latex_mathenv[i].numbered, true);
 485                                         break;
 486                                 }
 487
 488                                 case LM_OT_ALIGN: {
 489                                         p->halign(lexArg('{'));
 490                                         parse_lines(p, 2, latex_mathenv[i].numbered, true);
 491                                         break;
 492                                 }
 493
 494                                 case LM_OT_ALIGNAT: {
 495                                         p->halign(lexArg('{'));
 496                                         parse_lines(p, 2, latex_mathenv[i].numbered, true);
 497                                         break;
 498                                 }
 499
 500                                 default:
 501                                         lyxerr[Debug::MATHED]
 502                                                 << "1: unknown math environment: " << typ << "\n";
 503                         }
 504
 505                         break;
 506                 }
 507
 508                 default:
 509                         lyxerr[Debug::MATHED]
 510                                 << "2 unknown math environment: " << t << "\n";
 511         }
 512
 513         return p;
 514 }
 515
 516
 517 latexkeys const * Parser::read_delim()
 518 {
 519         int ld = yylex();
 520         //lyxerr << "found symbol: " << ld << "\n";
 521         latexkeys const * l = in_word_set(".");
 522         switch (ld) {
 523                 case LM_TK_SYM:
 524                 case LM_TK_NOGLYPH:
 525                 case LM_TK_SPECIAL:
 526                 case LM_TK_BEGIN: {
 527                         l = lval_;
 528                         //lyxerr << "found key 1: '" << l << "'\n";
 529                         //lyxerr << "found key 1: '" << l->name << "'\n";
 530                         break;
 531                 }
 532                 case ']':
 533                 case '[': {
 534                         string s;
 535                         s += ld;
 536                         l = in_word_set(s);
 537                         //lyxerr << "found key 2: '" << l->name << "'\n";
 538                         break;
 539                 }
 540                 case LM_TK_STR: {
 541                         string s;
 542                         s += ival_;
 543                         l = in_word_set(s);
 544                         //lyxerr << "found key 2: '" << l->name << "'\n";
 545                 }
 546         }
 547         return l;
 548 }
 549
 550
 551 void Parser::parse_into(MathArray & array, unsigned flags)
 552 {
 553         static int plevel = -1;
 554
 555         ++plevel;
 556         MathTextCodes yyvarcode   = LM_TC_VAR;
 557
 558         int  t      = yylex();
 559         bool panic  = false;
 560         int  brace  = 0;
 561         int  limits = 0;
 562
 563         while (t) {
 564                 //lyxerr << "t: " << t << " flags: " << flags << " i: " << ival_
 565                 //      << " '" << sval_ << "'\n";
 566                 //array.dump(lyxerr);
 567                 //lyxerr << "\n";
 568
 569                 if (flags & FLAG_ITEM) {
 570                         flags &= ~FLAG_ITEM;
 571                         if (t == LM_TK_OPEN) {
 572                                 // skip the brace and regard everything to the next matching
 573                                 // closing brace
 574                                 t = yylex();
 575                                 ++brace;
 576                                 flags |= FLAG_BRACE_LAST;
 577                         } else {
 578                                 // regard only this single token
 579                                 flags |= FLAG_LEAVE;
 580                         }
 581                 }
 582
 583                 if ((flags & FLAG_BRACE) && t != LM_TK_OPEN) {
 584                         error(
 585                                 "Expected {. Maybe you forgot to enclose an argument in {}");
 586                         panic = true;
 587                         break;
 588                 }
 589
 590                 switch (t) {
 591
 592                 case LM_TK_ALPHA:
 593                         if (!isspace(ival_) || yyvarcode == LM_TC_TEXTRM)
 594                                 array.push_back(new MathCharInset(ival_, yyvarcode));
 595                         break;
 596
 597                 case LM_TK_ARGUMENT: {
 598                         MathMacroArgument * p = new MathMacroArgument(ival_);
 599                         p->code(yyvarcode);
 600                         array.push_back(p);
 601                         break;
 602                 }
 603
 604                 case LM_TK_SPECIAL:
 605                         array.push_back(new MathCharInset(ival_, LM_TC_SPECIAL));
 606                         break;
 607
 608                 case LM_TK_STR:
 609                         array.push_back(new MathCharInset(ival_, LM_TC_CONST));
 610                         break;
 611
 612                 case LM_TK_OPEN:
 613                         ++brace;
 614                         if (flags & FLAG_BRACE)
 615                                 flags &= ~FLAG_BRACE;
 616                         else
 617                                 array.push_back(new MathCharInset('{', LM_TC_TEX));
 618                         break;
 619
 620                 case LM_TK_CLOSE:
 621                         --brace;
 622                         if (brace < 0) {
 623                                 error("Unmatching braces");
 624                                 panic = true;
 625                                 break;
 626                         }
 627                         if (flags & FLAG_BRACE_FONT) {
 628                                 yyvarcode = LM_TC_VAR;
 629                                 flags &= ~FLAG_BRACE_FONT;
 630                                 break;
 631                         }
 632                         if (brace == 0 && (flags & FLAG_BRACE_LAST))
 633                                 flags |= FLAG_LEAVE;
 634                         else
 635                                 array.push_back(new MathCharInset('}', LM_TC_TEX));
 636                         break;
 637
 638                 case '[':
 639                         array.push_back(new MathCharInset('[', LM_TC_CONST));
 640                         break;
 641
 642                 case ']':
 643                         if (flags & FLAG_BRACK_END)
 644                                 flags |= FLAG_LEAVE;
 645                         else
 646                                 array.push_back(new MathCharInset(']', LM_TC_CONST));
 647                         break;
 648
 649                 case '^':
 650                         parse_into(
 651                                 lastScriptInset(array, true, false, limits)->cell(0), FLAG_ITEM);
 652                         break;
 653
 654                 case '_':
 655                         parse_into(
 656                                 lastScriptInset(array, false, true, limits)->cell(1), FLAG_ITEM);
 657                         break;
 658
 659                 case LM_TK_LIMIT:
 660                         limits = lval_->id;
 661                         //lyxerr << "setting limit to " << limits << "\n";
 662                         break;
 663
 664                 case '&':
 665                         if (flags & FLAG_AMPERSAND) {
 666                                 flags &= ~FLAG_AMPERSAND;
 667                                 --plevel;
 668                                 return;
 669                         }
 670                         lyxerr[Debug::MATHED]
 671                                 << "found tab unexpectedly, array: '" << array << "'\n";
 672                         break;
 673
 674                 case LM_TK_NEWLINE:
 675                         if (flags & FLAG_NEWLINE) {
 676                                 flags &= ~FLAG_NEWLINE;
 677                                 --plevel;
 678                                 return;
 679                         }
 680                         lyxerr[Debug::MATHED]
 681                                 << "found newline unexpectedly, array: '" << array << "'\n";
 682                         break;
 683
 684                 case LM_TK_PROTECT:
 685                         break;
 686
 687                 case LM_TK_NOGLYPH:
 688                 case LM_TK_NOGLYPHB:
 689                         limits = 0;
 690                         array.push_back(new MathNoglyphInset(lval_));
 691                         break;
 692
 693                 case LM_TK_BIGSYM:
 694                         limits = 0;
 695                         array.push_back(new MathBigopInset(lval_));
 696                         break;
 697
 698                 case LM_TK_FUNCLIM:
 699                         limits = 0;
 700                         array.push_back(new MathFuncLimInset(lval_));
 701                         break;
 702
 703                 case LM_TK_SYM:
 704                         limits = 0;
 705                         array.push_back(new MathSymbolInset(lval_));
 706                         break;
 707
 708                 case LM_TK_BOP:
 709                         array.push_back(new MathCharInset(ival_, LM_TC_BOP));
 710                         break;
 711
 712                 case LM_TK_SPACE:
 713                         if (ival_ >= 0)
 714                                 array.push_back(new MathSpaceInset(ival_));
 715                         break;
 716
 717                 case LM_TK_DOTS:
 718                         array.push_back(new MathDotsInset(lval_));
 719                         break;
 720
 721                 case LM_TK_STACK:
 722                 {
 723                         MathStackrelInset * p = new MathStackrelInset;
 724                         parse_into(p->cell(0), FLAG_ITEM);
 725                         parse_into(p->cell(1), FLAG_ITEM);
 726                         array.push_back(p);
 727                         break;
 728                 }
 729
 730                 case LM_TK_FRAC:
 731                 {
 732                         MathFracInset * p = new MathFracInset;
 733                         parse_into(p->cell(0), FLAG_ITEM);
 734                         parse_into(p->cell(1), FLAG_ITEM);
 735                         array.push_back(p);
 736                         break;
 737                 }
 738
 739                 case LM_TK_SQRT:
 740                 {
 741                         unsigned char c = getuchar();
 742                         if (c == '[') {
 743                                 array.push_back(new MathRootInset);
 744                                 parse_into(array.back()->cell(0), FLAG_BRACK_END);
 745                                 parse_into(array.back()->cell(1), FLAG_ITEM);
 746                         } else {
 747                                 is_.putback(c);
 748                                 array.push_back(new MathSqrtInset);
 749                                 parse_into(array.back()->cell(0), FLAG_ITEM);
 750                         }
 751                         break;
 752                 }
 753
 754                 case LM_TK_LEFT:
 755                 {
 756                         latexkeys const * l = read_delim();
 757                         MathArray ar;
 758                         parse_into(ar, FLAG_RIGHT);
 759                         latexkeys const * r = read_delim();
 760                         MathDelimInset * dl = new MathDelimInset(l, r);
 761                         dl->cell(0) = ar;
 762                         array.push_back(dl);
 763                         break;
 764                 }
 765
 766                 case LM_TK_RIGHT:
 767                         if (flags & FLAG_RIGHT) {
 768                                 --plevel;
 769                                 return;
 770                         }
 771                         error("Unmatched right delimiter");
 772 //        panic = true;
 773                         break;
 774
 775                 case LM_TK_FONT:
 776                         yyvarcode = static_cast<MathTextCodes>(lval_->id);
 777                         flags |= (FLAG_BRACE | FLAG_BRACE_FONT);
 778                         break;
 779
 780                 case LM_TK_STY:
 781                 {
 782                         lyxerr[Debug::MATHED] << "LM_TK_STY not implemented\n";
 783                         //MathArray tmp = array;
 784                         //MathSizeInset * p = new MathSizeInset(MathStyles(lval_->id));
 785                         //array.push_back(p);
 786                         //parse_into(p->cell(0), FLAG_BRACE_FONT);
 787                         break;
 788                 }
 789
 790                 case LM_TK_DECORATION:
 791                 {
 792                         MathDecorationInset * p = new MathDecorationInset(lval_);
 793                         parse_into(p->cell(0), FLAG_ITEM);
 794                         array.push_back(p);
 795                         break;
 796                 }
 797
 798                 case LM_TK_NONUM:
 799                         curr_num_ = false;
 800                         break;
 801
 802                 case LM_TK_FUNC:
 803                         array.push_back(new MathSymbolInset(lval_));
 804                         break;
 805
 806                 case LM_TK_UNDEF:
 807                         if (MathMacroTable::hasTemplate(sval_)) {
 808                                 MathMacro * m = MathMacroTable::cloneTemplate(sval_);
 809                                 for (int i = 0; i < m->nargs(); ++i)
 810                                         parse_into(m->cell(i), FLAG_ITEM);
 811                                 array.push_back(m);
 812                                 m->metrics(LM_ST_TEXT);
 813                         } else
 814                                 array.push_back(new MathFuncInset(sval_));
 815                         break;
 816
 817                 case LM_TK_MATH:
 818                 case LM_TK_END:
 819                         --plevel;
 820                         return;
 821
 822                 case LM_TK_BEGIN:
 823                 {
 824                         int i = ival_;
 825                         MathInsetTypes typ = latex_mathenv[i].typ;
 826
 827                         if (typ == LM_OT_MATRIX) {
 828                                 string const valign = lexArg('[') + 'c';
 829                                 string const halign = lexArg('{');
 830                                 //lyxerr << "valign: '" << valign << "'\n";
 831                                 //lyxerr << "halign: '" << halign << "'\n";
 832                                 MathArrayInset * m = new MathArrayInset(halign.size(), 1);
 833                                 m->valign(valign[0]);
 834                                 m->halign(halign);
 835
 836                                 parse_lines(m, halign.size(), latex_mathenv[i].numbered, false);
 837                                 array.push_back(m);
 838                                 //lyxerr << "read matrix " << *m << "\n";
 839                                 break;
 840                         } else
 841                                 lyxerr[Debug::MATHED] << "unknow math inset " << typ << "\n";
 842                         break;
 843                 }
 844
 845                 case LM_TK_MACRO:
 846                         array.push_back(MathMacroTable::cloneTemplate(lval_->name));
 847                         break;
 848
 849                 case LM_TK_LABEL:
 850                         curr_label_ = lexArg('{', true);
 851                         break;
 852
 853                 default:
 854                         error("Unrecognized token");
 855                         lyxerr[Debug::MATHED] << "[" << t << " " << sval_ << "]" << endl;
 856                         break;
 857
 858                 } // end of big switch
 859
 860                 if (flags & FLAG_LEAVE) {
 861                         flags &= ~FLAG_LEAVE;
 862                         break;
 863                 }
 864
 865                 if (panic) {
 866                         lyxerr << " Math Panic, expect problems!" << endl;
 867                         //   Search for the end command.
 868                         do {
 869                                 t = yylex();
 870                         } while (is_.good() && t != LM_TK_END && t);
 871                 } else {
 872                         t = yylex();
 873                 }
 874         }
 875         --plevel;
 876 }
 877
 878
 879 void parse_end(LyXLex & lex, int lineno)
 880 {
 881         // Update line number
 882         lex.setLineNo(lineno);
 883
 884         // reading of end_inset
 885         while (lex.isOK()) {
 886                 lex.nextToken();
 887                 if (lex.getString() == "\\end_inset")
 888                         break;
 889                 lyxerr[Debug::MATHED] << "InsetFormula::Read: Garbage before \\end_inset,"
 890                         " or missing \\end_inset!" << endl;
 891         }
 892 }
 893
 894 } // anonymous namespace
 895
 896
 897
 898 MathArray mathed_parse_cell(string const & str)
 899 {
 900         istringstream is(str.c_str());
 901         Parser parser(is);
 902         MathArray ar;
 903         parser.parse_into(ar, 0);
 904         return ar;
 905 }
 906
 907
 908
 909 MathMacroTemplate * mathed_parse_macro(string const & str)
 910 {
 911         istringstream is(str.c_str());
 912         Parser parser(is);
 913         return parser.parse_macro();
 914 }
 915
 916 MathMacroTemplate * mathed_parse_macro(istream & is)
 917 {
 918         Parser parser(is);
 919         return parser.parse_macro();
 920 }
 921
 922 MathMacroTemplate * mathed_parse_macro(LyXLex & lex)
 923 {
 924         Parser parser(lex);
 925         MathMacroTemplate * p = parser.parse_macro();
 926         parse_end(lex, parser.lineno());
 927         return p;
 928 }
 929
 930
 931
 932 MathMatrixInset * mathed_parse_normal(string const & str)
 933 {
 934         istringstream is(str.c_str());
 935         Parser parser(is);
 936         return parser.parse_normal();
 937 }
 938
 939 MathMatrixInset * mathed_parse_normal(istream & is)
 940 {
 941         Parser parser(is);
 942         return parser.parse_normal();
 943 }
 944
 945 MathMatrixInset * mathed_parse_normal(LyXLex & lex)
 946 {
 947         Parser parser(lex);
 948         MathMatrixInset * p = parser.parse_normal();
 949         parse_end(lex, parser.lineno());
 950         return p;
 951 }
 952