src/tex2lyx/Parser.cpp

   1 /**
   2  * \file Parser.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author André Pönitz
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "Parser.h"
  14
  15 #include "Encoding.h"
  16 #include "support/lstrings.h"
  17 #include "support/textutils.h"
  18
  19 #include <cstdint>
  20 #include <iostream>
  21
  22 using namespace std;
  23 using namespace lyx::support;
  24
  25 namespace lyx {
  26
  27 namespace {
  28
  29 /*!
  30  * Translate a line ending to '\n'.
  31  * \p c must have catcode catNewline, and it must be the last character read
  32  * from \p is.
  33  */
  34 char_type getNewline(iparserdocstream & is, char_type c)
  35 {
  36         // we have to handle 3 different line endings:
  37         // - UNIX (\n)
  38         // - MAC  (\r)
  39         // - DOS  (\r\n)
  40         if (c == '\r') {
  41                 // MAC or DOS
  42                 char_type wc;
  43                 if (is.get(wc) && wc != '\n') {
  44                         // MAC
  45                         is.putback(wc);
  46                 }
  47                 return '\n';
  48         }
  49         // UNIX
  50         return c;
  51 }
  52
  53 } // namespace
  54
  55 //
  56 // Token
  57 //
  58
  59 ostream & operator<<(ostream & os, Token const & t)
  60 {
  61         if (t.cat() == catComment)
  62                 os << '%' << t.cs() << '\n';
  63         else if (t.cat() == catSpace)
  64                 os << t.cs();
  65         else if (t.cat() == catEscape)
  66                 os << '\\' << t.cs() << ' ';
  67         else if (t.cat() == catLetter)
  68                 os << t.cs();
  69         else if (t.cat() == catNewline)
  70                 os << "[" << t.cs().size() << "\\n," << t.cat() << "]\n";
  71         else
  72                 os << '[' << t.cs() << ',' << t.cat() << ']';
  73         return os;
  74 }
  75
  76
  77 string Token::asInput() const
  78 {
  79         if (cat_ == catComment)
  80                 return '%' + cs_ + '\n';
  81         if (cat_ == catEscape)
  82                 return '\\' + cs_;
  83         return cs_;
  84 }
  85
  86
  87 bool Token::isAlnumASCII() const
  88 {
  89         return cat_ == catLetter ||
  90                (cat_ == catOther && cs_.length() == 1 && isDigitASCII(cs_[0]));
  91 }
  92
  93
  94 #ifdef FILEDEBUG
  95 void debugToken(std::ostream & os, Token const & t, unsigned int flags)
  96 {
  97         char sep = ' ';
  98         os << "t: " << t << " flags: " << flags;
  99         if (flags & FLAG_BRACE_LAST) { os << sep << "BRACE_LAST"; sep = '|'; }
 100         if (flags & FLAG_RIGHT     ) { os << sep << "RIGHT"     ; sep = '|'; }
 101         if (flags & FLAG_END       ) { os << sep << "END"       ; sep = '|'; }
 102         if (flags & FLAG_BRACK_LAST) { os << sep << "BRACK_LAST"; sep = '|'; }
 103         if (flags & FLAG_TEXTMODE  ) { os << sep << "TEXTMODE"  ; sep = '|'; }
 104         if (flags & FLAG_ITEM      ) { os << sep << "ITEM"      ; sep = '|'; }
 105         if (flags & FLAG_LEAVE     ) { os << sep << "LEAVE"     ; sep = '|'; }
 106         if (flags & FLAG_SIMPLE    ) { os << sep << "SIMPLE"    ; sep = '|'; }
 107         if (flags & FLAG_EQUATION  ) { os << sep << "EQUATION"  ; sep = '|'; }
 108         if (flags & FLAG_SIMPLE2   ) { os << sep << "SIMPLE2"   ; sep = '|'; }
 109         if (flags & FLAG_OPTION    ) { os << sep << "OPTION"    ; sep = '|'; }
 110         if (flags & FLAG_BRACED    ) { os << sep << "BRACED"    ; sep = '|'; }
 111         if (flags & FLAG_CELL      ) { os << sep << "CELL"      ; sep = '|'; }
 112         if (flags & FLAG_TABBING   ) { os << sep << "TABBING"   ; sep = '|'; }
 113         os << "\n";
 114 }
 115 #endif
 116
 117
 118 //
 119 // Wrapper
 120 //
 121
 122 void iparserdocstream::setEncoding(std::string const & e)
 123 {
 124         is_ << lyx::setEncoding(e);
 125 }
 126
 127
 128 void iparserdocstream::putback(char_type c)
 129 {
 130         s_ = c + s_;
 131 }
 132
 133
 134 void iparserdocstream::putback(docstring const & s)
 135 {
 136         s_ = s + s_;
 137 }
 138
 139
 140 iparserdocstream & iparserdocstream::get(char_type &c)
 141 {
 142         if (s_.empty())
 143                 is_.get(c);
 144         else {
 145                 //cerr << "unparsed: " << to_utf8(s_) <<endl;
 146                 c = s_[0];
 147                 s_.erase(0,1);
 148         }
 149         return *this;
 150 }
 151
 152
 153 //
 154 // Parser
 155 //
 156
 157
 158 Parser::Parser(idocstream & is, std::string const & fixedenc)
 159         : lineno_(0), pos_(0), iss_(nullptr), is_(is),
 160           encoding_iconv_(fixedenc.empty() ? "UTF-8" : fixedenc),
 161           theCatcodesType_(NORMAL_CATCODES), curr_cat_(UNDECIDED_CATCODES),
 162           fixed_enc_(!fixedenc.empty())
 163 {
 164         if (fixed_enc_)
 165                 is_.setEncoding(fixedenc);
 166         catInit();
 167 }
 168
 169
 170 Parser::Parser(string const & s)
 171         : lineno_(0), pos_(0),
 172           iss_(new idocstringstream(from_utf8(s))), is_(*iss_),
 173           encoding_iconv_("UTF-8"),
 174           theCatcodesType_(NORMAL_CATCODES), curr_cat_(UNDECIDED_CATCODES),
 175           // An idocstringstream can not change the encoding
 176           fixed_enc_(true)
 177 {
 178         catInit();
 179 }
 180
 181
 182 Parser::~Parser()
 183 {
 184         delete iss_;
 185 }
 186
 187
 188 void Parser::deparse()
 189 {
 190         string s;
 191         for(size_type i = pos_ ; i < tokens_.size() ; ++i) {
 192                 s += tokens_[i].asInput();
 193         }
 194         is_.putback(from_utf8(s));
 195         tokens_.erase(tokens_.begin() + pos_, tokens_.end());
 196         // make sure that next token is read
 197         tokenize_one();
 198 }
 199
 200
 201 bool Parser::setEncoding(std::string const & e, int p)
 202 {
 203         // We may (and need to) use unsafe encodings here: Since the text is
 204         // converted to unicode while reading from is_, we never see text in
 205         // the original encoding of the parser, but operate on utf8 strings
 206         // instead. Therefore, we cannot misparse high bytes as {, } or \\.
 207         Encoding const * const enc = encodings.fromLaTeXName(e, p, true);
 208         if (!enc) {
 209                 cerr << "Unknown encoding " << e << ". Ignoring." << std::endl;
 210                 return false;
 211         }
 212         return setEncoding(enc->iconvName());
 213 }
 214
 215
 216 void Parser::catInit()
 217 {
 218         if (curr_cat_ == theCatcodesType_)
 219                 return;
 220         curr_cat_ = theCatcodesType_;
 221
 222         fill(theCatcode_, theCatcode_ + 256, catOther);
 223         fill(theCatcode_ + 'a', theCatcode_ + 'z' + 1, catLetter);
 224         fill(theCatcode_ + 'A', theCatcode_ + 'Z' + 1, catLetter);
 225         // This is wrong!
 226         theCatcode_[int('@')]  = catLetter;
 227
 228         if (theCatcodesType_ == NORMAL_CATCODES) {
 229                 theCatcode_[int('\\')] = catEscape;
 230                 theCatcode_[int('{')]  = catBegin;
 231                 theCatcode_[int('}')]  = catEnd;
 232                 theCatcode_[int('$')]  = catMath;
 233                 theCatcode_[int('&')]  = catAlign;
 234                 theCatcode_[int('\n')] = catNewline;
 235                 theCatcode_[int('#')]  = catParameter;
 236                 theCatcode_[int('^')]  = catSuper;
 237                 theCatcode_[int('_')]  = catSub;
 238                 theCatcode_[0x7f]      = catIgnore;
 239                 theCatcode_[int(' ')]  = catSpace;
 240                 theCatcode_[int('\t')] = catSpace;
 241                 theCatcode_[int('\r')] = catNewline;
 242                 theCatcode_[int('~')]  = catActive;
 243                 theCatcode_[int('%')]  = catComment;
 244         }
 245 }
 246
 247 CatCode Parser::catcode(char_type c) const
 248 {
 249         if (c < 256)
 250                 return theCatcode_[(unsigned char)c];
 251         return catOther;
 252 }
 253
 254
 255 void Parser::setCatcode(char c, CatCode cat)
 256 {
 257         theCatcode_[(unsigned char)c] = cat;
 258         deparse();
 259 }
 260
 261
 262 void Parser::setCatcodes(cat_type t)
 263 {
 264         theCatcodesType_ = t;
 265         deparse();
 266 }
 267
 268
 269 bool Parser::setEncoding(std::string const & e)
 270 {
 271         //cerr << "setting encoding to " << e << std::endl;
 272         encoding_iconv_ = e;
 273         // If the encoding is fixed, we must not change the stream encoding
 274         // (because the whole input uses that encoding, e.g. if it comes from
 275         // the clipboard). We still need to track the original encoding in
 276         // encoding_iconv_, so that the generated output is correct.
 277         if (!fixed_enc_)
 278                 is_.setEncoding(e);
 279         return true;
 280 }
 281
 282
 283 void Parser::push_back(Token const & t)
 284 {
 285         tokens_.push_back(t);
 286 }
 287
 288
 289 // We return a copy here because the tokens_ vector may get reallocated
 290 Token const Parser::prev_token() const
 291 {
 292         static const Token dummy;
 293         return pos_ > 1 ? tokens_[pos_ - 2] : dummy;
 294 }
 295
 296
 297 // We return a copy here because the tokens_ vector may get reallocated
 298 Token const Parser::curr_token() const
 299 {
 300         static const Token dummy;
 301         return pos_ > 0 ? tokens_[pos_ - 1] : dummy;
 302 }
 303
 304
 305 // We return a copy here because the tokens_ vector may get reallocated
 306 Token const Parser::next_token()
 307 {
 308         static const Token dummy;
 309         if (!good())
 310                 return dummy;
 311         if (pos_ >= tokens_.size())
 312                 tokenize_one();
 313         return pos_ < tokens_.size() ? tokens_[pos_] : dummy;
 314 }
 315
 316
 317 // We return a copy here because the tokens_ vector may get reallocated
 318 Token const Parser::next_next_token()
 319 {
 320         static const Token dummy;
 321         if (!good())
 322                 return dummy;
 323         // If tokenize_one() has not been called after the last get_token() we
 324         // need to tokenize two more tokens.
 325         if (pos_ >= tokens_.size())
 326                 tokenize_one();
 327         if (pos_ + 1 >= tokens_.size())
 328                 tokenize_one();
 329         return pos_ + 1 < tokens_.size() ? tokens_[pos_ + 1] : dummy;
 330 }
 331
 332
 333 // We return a copy here because the tokens_ vector may get reallocated
 334 Token const Parser::get_token()
 335 {
 336         static const Token dummy;
 337         if (!good())
 338                 return dummy;
 339         if (pos_ >= tokens_.size()) {
 340                 tokenize_one();
 341                 if (pos_ >= tokens_.size())
 342                         return dummy;
 343         }
 344         // cerr << "looking at token " << tokens_[pos_]
 345         //      << " pos: " << pos_ << '\n';
 346         return tokens_[pos_++];
 347 }
 348
 349
 350 bool Parser::isParagraph()
 351 {
 352         // A new paragraph in TeX is started
 353         // - either by a newline, following any amount of whitespace
 354         //   characters (including zero), and another newline
 355         // - or the token \par
 356         if (curr_token().cat() == catNewline &&
 357             (curr_token().cs().size() > 1 ||
 358              (next_token().cat() == catSpace &&
 359               next_next_token().cat() == catNewline)))
 360                 return true;
 361         if (curr_token().cat() == catEscape && curr_token().cs() == "par")
 362                 return true;
 363         return false;
 364 }
 365
 366
 367 bool Parser::skip_spaces(bool skip_comments)
 368 {
 369         // We just silently return if we have no more tokens.
 370         // skip_spaces() should be callable at any time,
 371         // the caller must check p::good() anyway.
 372         bool skipped = false;
 373         while (good()) {
 374                 get_token();
 375                 if (isParagraph()) {
 376                         putback();
 377                         break;
 378                 }
 379                 if (curr_token().cat() == catSpace ||
 380                     curr_token().cat() == catNewline) {
 381                         skipped = true;
 382                         continue;
 383                 }
 384                 if ((curr_token().cat() == catComment && curr_token().cs().empty()))
 385                         continue;
 386                 if (skip_comments && curr_token().cat() == catComment) {
 387                         // If positions_ is not empty we are doing some kind
 388                         // of look ahead
 389                         if (!positions_.empty())
 390                                 cerr << "  Ignoring comment: "
 391                                      << curr_token().asInput();
 392                 } else {
 393                         putback();
 394                         break;
 395                 }
 396         }
 397         return skipped;
 398 }
 399
 400
 401 void Parser::unskip_spaces(bool skip_comments)
 402 {
 403         while (pos_ > 0) {
 404                 if ( curr_token().cat() == catSpace ||
 405                     (curr_token().cat() == catNewline && curr_token().cs().size() == 1))
 406                         putback();
 407                 else if (skip_comments && curr_token().cat() == catComment) {
 408                         // TODO: Get rid of this
 409                         // If positions_ is not empty we are doing some kind
 410                         // of look ahead
 411                         if (!positions_.empty())
 412                                 cerr << "Unignoring comment: "
 413                                      << curr_token().asInput();
 414                         putback();
 415                 }
 416                 else
 417                         break;
 418         }
 419 }
 420
 421
 422 void Parser::putback()
 423 {
 424         --pos_;
 425 }
 426
 427
 428 void Parser::pushPosition()
 429 {
 430         positions_.push_back(pos_);
 431 }
 432
 433
 434 void Parser::popPosition()
 435 {
 436         pos_ = positions_.back();
 437         positions_.pop_back();
 438         deparse();
 439 }
 440
 441
 442 void Parser::dropPosition()
 443 {
 444         positions_.pop_back();
 445 }
 446
 447
 448 bool Parser::good() const
 449 {
 450         if (pos_ < tokens_.size())
 451                 return true;
 452         if (!is_.good())
 453                 return false;
 454         return is_.peek() != idocstream::traits_type::eof();
 455 }
 456
 457
 458 bool Parser::hasOpt(string const & l)
 459 {
 460         // An optional argument can occur in any of the following forms:
 461         // - \foo[bar]
 462         // - \foo [bar]
 463         // - \foo
 464         //   [bar]
 465         // - \foo %comment
 466         //   [bar]
 467
 468         // remember current position
 469         unsigned int oldpos = pos_;
 470         // skip spaces and comments
 471         while (good()) {
 472                 get_token();
 473                 if (isParagraph()) {
 474                         putback();
 475                         break;
 476                 }
 477                 if (curr_token().cat() == catSpace ||
 478                     curr_token().cat() == catNewline ||
 479                     curr_token().cat() == catComment)
 480                         continue;
 481                 putback();
 482                 break;
 483         }
 484         bool const retval = (next_token().asInput() == l);
 485         pos_ = oldpos;
 486         return retval;
 487 }
 488
 489
 490 bool Parser::hasIdxMacros(string const & c, string const & e)
 491 {
 492         // Check for index entry separator (! or @),
 493         // consider escaping via "
 494         // \p e marks a terminating delimiter¸
 495
 496         // remember current position
 497         unsigned int oldpos = pos_;
 498         // skip spaces and comments
 499         bool retval = false;
 500         while (good()) {
 501                 get_token();
 502                 if (isParagraph()) {
 503                         putback();
 504                         break;
 505                 }
 506                 if (curr_token().cat() == catEnd)
 507                         break;
 508                 if (!e.empty() && curr_token().asInput() == e
 509                     && prev_token().asInput() != "\"")
 510                         break;
 511                 if (curr_token().asInput() == c
 512                     && prev_token().asInput() != "\"") {
 513                         retval = true;
 514                         break;
 515                 }
 516                 continue;
 517         }
 518         pos_ = oldpos;
 519         return retval;
 520 }
 521
 522
 523 Parser::Arg Parser::getFullArg(char left, char right, bool allow_escaping, char e)
 524 {
 525         skip_spaces(true);
 526
 527         // This is needed if a partial file ends with a command without arguments,
 528         // e. g. \medskip
 529         if (! good())
 530                 return make_pair(false, string());
 531
 532         int group_level = (left == '{') ? 1 : 0;
 533         string result;
 534         Token t = get_token();
 535
 536         if (left != char()
 537             && (t.cat() == catComment || t.cat() == catEscape
 538                 || t.character() != left)) {
 539                 putback();
 540                 return make_pair(false, string());
 541         } else {
 542                 while (good()) {
 543                         t = get_token();
 544                         // honor grouping
 545                         if (t.cat() == catBegin) {
 546                                 ++group_level;
 547                                 if (left != '{')
 548                                         continue;
 549                         }
 550                         if (group_level > 0 && t.cat() == catEnd) {
 551                                 --group_level;
 552                                 if (left != '{')
 553                                         continue;
 554                         }
 555                         // Ignore comments
 556                         if (t.cat() == catComment) {
 557                                 if (!t.cs().empty())
 558                                         cerr << "Ignoring comment: " << t.asInput();
 559                                 continue;
 560                         }
 561                         if (allow_escaping) {
 562                                 if (t.cat() != catEscape && t.character() == right
 563                                     && group_level == 0)
 564                                         break;
 565                         } else if (e != char()) {
 566                                 if (prev_token().character() != e && t.character() == right
 567                                     && group_level == 0)
 568                                         break;
 569                         } else {
 570                                 if (t.character() == right) {
 571                                         if (t.cat() == catEscape)
 572                                                 result += '\\';
 573                                         if (group_level == 0)
 574                                                 break;
 575                                 }
 576                         }
 577                         result += t.asInput();
 578                 }
 579         }
 580         return make_pair(true, result);
 581 }
 582
 583
 584 string Parser::getArg(char left, char right, bool allow_escaping, char e)
 585 {
 586         return getFullArg(left, right, allow_escaping, e).second;
 587 }
 588
 589
 590 string Parser::getFullOpt(bool keepws, char left, char right)
 591 {
 592         Arg arg = getFullArg(left, right);
 593         if (arg.first)
 594                 return left + arg.second + right;
 595         if (keepws)
 596                 unskip_spaces(true);
 597         return string();
 598 }
 599
 600
 601 string Parser::getOpt(bool keepws)
 602 {
 603         string const res = getArg('[', ']');
 604         if (res.empty()) {
 605                 if (keepws)
 606                         unskip_spaces(true);
 607                 return string();
 608         }
 609         return '[' + res + ']';
 610 }
 611
 612
 613 string Parser::getFullParentheseArg()
 614 {
 615         Arg arg = getFullArg('(', ')');
 616         if (arg.first)
 617                 return '(' + arg.second + ')';
 618         return string();
 619 }
 620
 621
 622 bool Parser::hasListPreamble(string const & itemcmd)
 623 {
 624         // remember current position
 625         unsigned int oldpos = pos_;
 626         // jump over arguments
 627         if (hasOpt())
 628                 getOpt();
 629         if (hasOpt("{"))
 630                 getArg('{', '}');
 631         // and swallow spaces and comments
 632         skip_spaces(true);
 633         // we have a list preamble if the next thing
 634         // that follows is not the \item command
 635         bool res =  next_token().cs() != itemcmd;
 636         // back to orig position
 637         pos_ = oldpos;
 638         return res;
 639 }
 640
 641
 642 string const Parser::ertEnvironment(string const & name)
 643 {
 644         if (!good())
 645                 return string();
 646
 647         ostringstream os;
 648         for (Token t = get_token(); good(); t = get_token()) {
 649                 if (t.cat() == catBegin) {
 650                         putback();
 651                         os << '{' << verbatim_item() << '}';
 652                 } else if (t.asInput() == "\\begin") {
 653                         string const env = getArg('{', '}');
 654                         os << "\\begin{" << env << '}'
 655                            << ertEnvironment(env)
 656                            << "\\end{" << env << '}';
 657                 } else if (t.asInput() == "\\end") {
 658                         string const end = getArg('{', '}');
 659                         if (end != name)
 660                                 cerr << "\\end{" << end
 661                                      << "} does not match \\begin{" << name
 662                                      << "}." << endl;
 663                         return os.str();
 664                 } else
 665                         os << t.asInput();
 666         }
 667         cerr << "unexpected end of input" << endl;
 668         return os.str();
 669 }
 670
 671
 672 string const Parser::plainEnvironment(string const & name)
 673 {
 674         if (!good())
 675                 return string();
 676
 677         ostringstream os;
 678         for (Token t = get_token(); good(); t = get_token()) {
 679                 if (t.asInput() == "\\end") {
 680                         string const end = getArg('{', '}');
 681                         if (end == name)
 682                                 return os.str();
 683                         else
 684                                 os << "\\end{" << end << '}';
 685                 } else
 686                         os << t.asInput();
 687         }
 688         cerr << "unexpected end of input" << endl;
 689         return os.str();
 690 }
 691
 692
 693 string const Parser::plainCommand(char left, char right, string const & name)
 694 {
 695         if (!good())
 696                 return string();
 697         // check if first token is really the start character
 698         Token tok = get_token();
 699         if (tok.character() != left) {
 700                 cerr << "first character does not match start character of command \\" << name << endl;
 701                 return string();
 702         }
 703         ostringstream os;
 704         for (Token t = get_token(); good(); t = get_token()) {
 705                 if (t.character() == right) {
 706                         return os.str();
 707                 } else
 708                         os << t.asInput();
 709         }
 710         cerr << "unexpected end of input" << endl;
 711         return os.str();
 712 }
 713
 714
 715 string const Parser::getCommandLatexParam()
 716 {
 717         if (!good())
 718                 return string();
 719         string res;
 720         size_t offset = 0;
 721         while (true) {
 722                 if (pos_ + offset >= tokens_.size())
 723                         tokenize_one();
 724                 if (pos_ + offset >= tokens_.size())
 725                         break;
 726                 Token t = tokens_[pos_ + offset];
 727                 if (t.cat() == catBegin)
 728                         break;
 729                 res += t.asInput();
 730                 ++offset;
 731         }
 732         return res;
 733 }
 734
 735
 736 Parser::Arg Parser::verbatimStuff(string const & end_string, bool const allow_linebreak)
 737 {
 738         if (!good())
 739                 return Arg(false, string());
 740
 741         pushPosition();
 742         ostringstream oss;
 743         size_t match_index = 0;
 744         setCatcodes(VERBATIM_CATCODES);
 745         for (Token t = get_token(); good(); t = get_token()) {
 746                 // FIXME t.asInput() might be longer than we need ?
 747                 if (t.asInput() == end_string.substr(match_index,
 748                                                      t.asInput().length())) {
 749                         match_index += t.asInput().length();
 750                         if (match_index >= end_string.length())
 751                                 break;
 752                 } else {
 753                         if (!allow_linebreak && t.asInput() == "\n") {
 754                                 cerr << "unexpected end of input" << endl;
 755                                 popPosition();
 756                                 setCatcodes(NORMAL_CATCODES);
 757                                 return Arg(false, string());
 758                         }
 759                         if (match_index) {
 760                                 oss << end_string.substr(0, match_index)
 761                                     << t.asInput();
 762                                 match_index = 0;
 763                         } else
 764                                 oss << t.asInput();
 765                 }
 766         }
 767
 768         if (!good()) {
 769                 cerr << "unexpected end of input" << endl;
 770                 popPosition();
 771                 setCatcodes(NORMAL_CATCODES);
 772                 return Arg(false, string());
 773         }
 774         setCatcodes(NORMAL_CATCODES);
 775         dropPosition();
 776         return Arg(true, oss.str());
 777 }
 778
 779
 780 string const Parser::verbatimEnvironment(string const & name)
 781 {
 782         //FIXME: do something if endstring is not found
 783         string s = verbatimStuff("\\end{" + name + "}").second;
 784         // ignore one newline at beginning or end of string
 785         if (prefixIs(s, "\n"))
 786                 s.erase(0,1);
 787         if (suffixIs(s, "\n"))
 788                 s.erase(s.length() - 1,1);
 789         return s;
 790 }
 791
 792
 793 string Parser::verbatimOption()
 794 {
 795         string res;
 796         if (next_token().character() == '[') {
 797                 Token t = get_token();
 798                 for (t = get_token(); t.character() != ']' && good(); t = get_token()) {
 799                         if (t.cat() == catBegin) {
 800                                 putback();
 801                                 res += '{' + verbatim_item() + '}';
 802                         } else
 803                                 res += t.asInput();
 804                 }
 805         }
 806         return res;
 807 }
 808
 809
 810 string Parser::verbatim_item()
 811 {
 812         if (!good())
 813                 error("stream bad");
 814         skip_spaces();
 815         if (next_token().cat() == catBegin) {
 816                 Token t = get_token(); // skip brace
 817                 string res;
 818                 for (t = get_token(); t.cat() != catEnd && good(); t = get_token()) {
 819                         if (t.cat() == catBegin) {
 820                                 putback();
 821                                 res += '{' + verbatim_item() + '}';
 822                         }
 823                         else
 824                                 res += t.asInput();
 825                 }
 826                 return res;
 827         }
 828         return get_token().asInput();
 829 }
 830
 831
 832 void Parser::tokenize_one()
 833 {
 834         catInit();
 835         char_type c;
 836         if (!is_.get(c))
 837                 return;
 838
 839         switch (catcode(c)) {
 840         case catSpace: {
 841                 docstring s(1, c);
 842                 while (is_.get(c) && catcode(c) == catSpace)
 843                         s += c;
 844                 if (catcode(c) != catSpace)
 845                         is_.putback(c);
 846                 push_back(Token(s, catSpace));
 847                 break;
 848         }
 849
 850         case catNewline: {
 851                 ++lineno_;
 852                 docstring s(1, getNewline(is_, c));
 853                 while (is_.get(c) && catcode(c) == catNewline) {
 854                         ++lineno_;
 855                         s += getNewline(is_, c);
 856                 }
 857                 if (catcode(c) != catNewline)
 858                         is_.putback(c);
 859                 push_back(Token(s, catNewline));
 860                 break;
 861         }
 862
 863         case catComment: {
 864                 // We don't treat "%\n" combinations here specially because
 865                 // we want to preserve them in the preamble
 866                 docstring s;
 867                 while (is_.get(c) && catcode(c) != catNewline)
 868                         s += c;
 869                 // handle possible DOS line ending
 870                 if (catcode(c) == catNewline)
 871                         c = getNewline(is_, c);
 872                 // Note: The '%' at the beginning and the '\n' at the end
 873                 // of the comment are not stored.
 874                 ++lineno_;
 875                 push_back(Token(s, catComment));
 876                 break;
 877         }
 878
 879         case catEscape: {
 880                 is_.get(c);
 881                 if (!is_) {
 882                         error("unexpected end of input");
 883                 } else {
 884                         docstring s(1, c);
 885                         if (catcode(c) == catLetter) {
 886                                 // collect letters
 887                                 while (is_.get(c) && catcode(c) == catLetter)
 888                                         s += c;
 889                                 if (catcode(c) != catLetter)
 890                                         is_.putback(c);
 891                         }
 892                         push_back(Token(s, catEscape));
 893                 }
 894                 break;
 895         }
 896
 897         case catIgnore: {
 898                 cerr << "ignoring a char: " << static_cast<uint32_t>(c) << "\n";
 899                 break;
 900         }
 901
 902         default:
 903                 push_back(Token(docstring(1, c), catcode(c)));
 904         }
 905         //cerr << tokens_.back();
 906 }
 907
 908
 909 void Parser::dump() const
 910 {
 911         cerr << "\nTokens: ";
 912         for (unsigned i = 0; i < tokens_.size(); ++i) {
 913                 if (i == pos_)
 914                         cerr << " <#> ";
 915                 cerr << tokens_[i];
 916         }
 917         cerr << " pos: " << pos_ << "\n";
 918 }
 919
 920
 921 void Parser::error(string const & msg) const
 922 {
 923         cerr << "Line ~" << lineno_ << ":  parse error: " << msg << endl;
 924         dump();
 925         //exit(1);
 926 }
 927
 928
 929 void Parser::reset()
 930 {
 931         pos_ = 0;
 932 }
 933
 934
 935 } // namespace lyx