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