src/Encoding.cpp

   1 /**
   2  * \file Encoding.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Lars Gullik Bjønnes
   7  * \author Jean-Marc Lasgouttes
   8  * \author Dekel Tsur
   9  *
  10  * Full author contact details are available in file CREDITS.
  11  */
  12
  13 #include <config.h>
  14
  15 #include "Encoding.h"
  16
  17 #include "Lexer.h"
  18
  19 #include "support/debug.h"
  20 #include "support/gettext.h"
  21 #include "support/lstrings.h"
  22 #include "support/textutils.h"
  23 #include "support/unicode.h"
  24
  25 #include <boost/cstdint.hpp>
  26
  27 #include <sstream>
  28 #include <algorithm>
  29
  30 using namespace std;
  31 using namespace lyx::support;
  32
  33 namespace lyx {
  34
  35 int const Encoding::any = -1;
  36
  37 Encodings encodings;
  38
  39 Encodings::MathCommandSet Encodings::mathcmd;
  40 Encodings::TextCommandSet Encodings::textcmd;
  41 Encodings::MathSymbolSet  Encodings::mathsym;
  42
  43 namespace {
  44
  45 typedef map<char_type, CharInfo> CharInfoMap;
  46 CharInfoMap unicodesymbols;
  47
  48 typedef set<char_type> CharSet;
  49 typedef map<string, CharSet> CharSetMap;
  50 CharSet forced;
  51 CharSetMap forcedselected;
  52
  53 typedef set<char_type> MathAlphaSet;
  54 MathAlphaSet mathalpha;
  55
  56
  57 /// The highest code point in UCS4 encoding (1<<20 + 1<<16)
  58 char_type const max_ucs4 = 0x110000;
  59
  60 } // namespace anon
  61
  62
  63 EncodingException::EncodingException(char_type c)
  64         : failed_char(c), par_id(0), pos(0)
  65 {
  66 }
  67
  68
  69 const char * EncodingException::what() const throw()
  70 {
  71         return "Could not find LaTeX command for a character";
  72 }
  73
  74
  75 CharInfo::CharInfo(
  76         docstring const & textcommand, docstring const & mathcommand,
  77         std::string const & textpreamble, std::string const & mathpreamble,
  78         std::string const & tipashortcut, unsigned int flags)
  79         : textcommand_(textcommand), mathcommand_(mathcommand),
  80           textpreamble_(textpreamble), mathpreamble_(mathpreamble),
  81           tipashortcut_(tipashortcut), flags_(flags)
  82 {
  83 }
  84
  85
  86 Encoding::Encoding(string const & n, string const & l, string const & g,
  87                    string const & i, bool f, bool u, Encoding::Package p)
  88         : name_(n), latexName_(l), guiName_(g), iconvName_(i), fixedwidth_(f),
  89           unsafe_(u), forced_(&forcedselected[n]), package_(p)
  90 {
  91         if (n == "ascii") {
  92                 // ASCII can encode 128 code points and nothing else
  93                 start_encodable_ = 128;
  94                 complete_ = true;
  95         } else if (i == "UTF-8") {
  96                 // UTF8 can encode all UCS4 code points
  97                 start_encodable_ = max_ucs4;
  98                 complete_ = true;
  99         } else {
 100                 start_encodable_ = 0;
 101                 complete_ = false;
 102         }
 103 }
 104
 105
 106 void Encoding::init() const
 107 {
 108         if (complete_)
 109                 return;
 110
 111         start_encodable_ = 0;
 112         // temporarily switch off lyxerr, since we will generate iconv errors
 113         lyxerr.disable();
 114         if (fixedwidth_) {
 115                 // We do not need to check all UCS4 code points, it is enough
 116                 // if we check all 256 code points of this encoding.
 117                 for (unsigned short j = 0; j < 256; ++j) {
 118                         char const c = char(j);
 119                         vector<char_type> const ucs4 = eightbit_to_ucs4(&c, 1, iconvName_);
 120                         if (ucs4.size() != 1)
 121                                 continue;
 122                         char_type const uc = ucs4[0];
 123                         CharInfoMap::const_iterator const it = unicodesymbols.find(uc);
 124                         if (it == unicodesymbols.end())
 125                                 encodable_.insert(uc);
 126                         else if (!it->second.force()) {
 127                                 if (forced_->empty() || forced_->find(uc) == forced_->end())
 128                                         encodable_.insert(uc);
 129                         }
 130                 }
 131         } else {
 132                 // We do not know how many code points this encoding has, and
 133                 // they do not have a direct representation as a single byte,
 134                 // therefore we need to check all UCS4 code points.
 135                 // This is expensive!
 136                 for (char_type c = 0; c < max_ucs4; ++c) {
 137                         vector<char> const eightbit = ucs4_to_eightbit(&c, 1, iconvName_);
 138                         if (!eightbit.empty()) {
 139                                 CharInfoMap::const_iterator const it = unicodesymbols.find(c);
 140                                 if (it == unicodesymbols.end())
 141                                         encodable_.insert(c);
 142                                 else if (!it->second.force()) {
 143                                         if (forced_->empty() || forced_->find(c) == forced_->end())
 144                                                 encodable_.insert(c);
 145                                 }
 146                         }
 147                 }
 148         }
 149         lyxerr.enable();
 150         CharSet::iterator it = encodable_.find(start_encodable_);
 151         while (it != encodable_.end()) {
 152                 encodable_.erase(it);
 153                 ++start_encodable_;
 154                 it = encodable_.find(start_encodable_);
 155         }
 156         complete_ = true;
 157 }
 158
 159
 160 bool Encoding::isForced(char_type c) const
 161 {
 162         if (!forced.empty() && forced.find(c) != forced.end())
 163                 return true;
 164         return !forced_->empty() && forced_->find(c) != forced_->end();
 165 }
 166
 167
 168 bool Encoding::encodable(char_type c) const
 169 {
 170         // assure the used encoding is properly initialized
 171         init();
 172
 173         if (iconvName_ == "UTF-8" && package_ == none)
 174                 return true;
 175         if (c < start_encodable_ && !isForced(c))
 176                 return true;
 177         if (encodable_.find(c) != encodable_.end())
 178                 return true;
 179         return false;
 180 }
 181
 182
 183 pair<docstring, bool> Encoding::latexChar(char_type c) const
 184 {
 185         if (encodable(c))
 186                 return make_pair(docstring(1, c), false);
 187
 188         // c cannot (or should not) be encoded in this encoding
 189         CharInfoMap::const_iterator const it = unicodesymbols.find(c);
 190         if (it == unicodesymbols.end())
 191                 throw EncodingException(c);
 192         // at least one of mathcommand and textcommand is nonempty
 193         if (it->second.textcommand().empty())
 194                 return make_pair(
 195                         "\\ensuremath{" + it->second.mathcommand() + '}', false);
 196         return make_pair(it->second.textcommand(), !it->second.textnotermination());
 197 }
 198
 199
 200 pair<docstring, docstring> Encoding::latexString(docstring const & input, bool dryrun) const
 201 {
 202         docstring result;
 203         docstring uncodable;
 204         bool terminate = false;
 205         for (size_t n = 0; n < input.size(); ++n) {
 206                 try {
 207                         char_type const c = input[n];
 208                         pair<docstring, bool> latex_char = latexChar(c);
 209                         docstring const latex = latex_char.first;
 210                         if (terminate && !prefixIs(latex, '\\')
 211                             && !prefixIs(latex, '{')
 212                             && !prefixIs(latex, '}')) {
 213                                         // Prevent eating of a following
 214                                         // space or command corruption by
 215                                         // following characters
 216                                         if (latex == " ")
 217                                                 result += "{}";
 218                                         else
 219                                                 result += " ";
 220                                 }
 221                         result += latex;
 222                         terminate = latex_char.second;
 223                 } catch (EncodingException & /* e */) {
 224                         LYXERR0("Uncodable character in latexString!");
 225                         if (dryrun) {
 226                                 result += "<" + _("LyX Warning: ")
 227                                            + _("uncodable character") + " '";
 228                                 result += docstring(1, input[n]);
 229                                 result += "'>";
 230                         } else
 231                                 uncodable += input[n];
 232                 }
 233         }
 234         return make_pair(result, uncodable);
 235 }
 236
 237
 238 vector<char_type> Encoding::symbolsList() const
 239 {
 240         // assure the used encoding is properly initialized
 241         init();
 242
 243         // first all encodable characters
 244         vector<char_type> symbols(encodable_.begin(), encodable_.end());
 245         // add those below start_encodable_
 246         for (char_type c = 0; c < start_encodable_; ++c)
 247                 symbols.push_back(c);
 248         // now the ones from the unicodesymbols file
 249         CharInfoMap::const_iterator const end = unicodesymbols.end();
 250         CharInfoMap::const_iterator it = unicodesymbols.begin();
 251         for (; it != end; ++it)
 252                 symbols.push_back(it->first);
 253         return symbols;
 254 }
 255
 256
 257 bool Encodings::latexMathChar(char_type c, bool mathmode,
 258                         Encoding const * encoding, docstring & command,
 259                         bool & needsTermination)
 260 {
 261         command = empty_docstring();
 262         if (encoding)
 263                 if (encoding->encodable(c))
 264                         command = docstring(1, c);
 265         needsTermination = false;
 266
 267         CharInfoMap::const_iterator const it = unicodesymbols.find(c);
 268         if (it == unicodesymbols.end()) {
 269                 if (!encoding || command.empty())
 270                         throw EncodingException(c);
 271                 if (mathmode)
 272                         addMathSym(c);
 273                 return false;
 274         }
 275         // at least one of mathcommand and textcommand is nonempty
 276         bool use_math = (mathmode && !it->second.mathcommand().empty()) ||
 277                         (!mathmode && it->second.textcommand().empty());
 278         if (use_math) {
 279                 command = it->second.mathcommand();
 280                 needsTermination = !it->second.mathnotermination();
 281                 addMathCmd(c);
 282         } else {
 283                 if (!encoding || command.empty()) {
 284                         command = it->second.textcommand();
 285                         needsTermination = !it->second.textnotermination();
 286                         addTextCmd(c);
 287                 }
 288                 if (mathmode)
 289                         addMathSym(c);
 290         }
 291         return use_math;
 292 }
 293
 294
 295 char_type Encodings::fromLaTeXCommand(docstring const & cmd, int cmdtype,
 296                 bool & combining, bool & needsTermination, set<string> * req)
 297 {
 298         CharInfoMap::const_iterator const end = unicodesymbols.end();
 299         CharInfoMap::const_iterator it = unicodesymbols.begin();
 300         for (combining = false; it != end; ++it) {
 301                 docstring const math = it->second.mathcommand();
 302                 docstring const text = it->second.textcommand();
 303                 if ((cmdtype & MATH_CMD) && math == cmd) {
 304                         combining = it->second.combining();
 305                         needsTermination = !it->second.mathnotermination();
 306                         if (req && it->second.mathfeature() &&
 307                             !it->second.mathpreamble().empty())
 308                                 req->insert(it->second.mathpreamble());
 309                         return it->first;
 310                 }
 311                 if ((cmdtype & TEXT_CMD) && text == cmd) {
 312                         combining = it->second.combining();
 313                         needsTermination = !it->second.textnotermination();
 314                         if (req && it->second.textfeature() &&
 315                             !it->second.textpreamble().empty())
 316                                 req->insert(it->second.textpreamble());
 317                         return it->first;
 318                 }
 319         }
 320         needsTermination = false;
 321         return 0;
 322 }
 323
 324
 325 docstring Encodings::fromLaTeXCommand(docstring const & cmd, int cmdtype,
 326                 bool & needsTermination, docstring & rem, set<string> * req)
 327 {
 328         needsTermination = false;
 329         rem = empty_docstring();
 330         bool const mathmode = cmdtype & MATH_CMD;
 331         bool const textmode = cmdtype & TEXT_CMD;
 332         docstring symbols;
 333         size_t const cmdend = cmd.size();
 334         size_t prefix = 0;
 335         CharInfoMap::const_iterator const uniend = unicodesymbols.end();
 336         for (size_t i = 0, j = 0; j < cmdend; ++j) {
 337                 // Also get the char after a backslash
 338                 if (j + 1 < cmdend && cmd[j] == '\\') {
 339                         ++j;
 340                         prefix = 1;
 341                         // Detect things like \=*{e} as well
 342                         if (j + 3 < cmdend && cmd[j+1] == '*' &&
 343                             cmd[j+2] == '{') {
 344                                 ++j;
 345                                 prefix = 2;
 346                         }
 347                 }
 348                 // position of the last character before a possible macro
 349                 // argument
 350                 size_t m = j;
 351                 // If a macro argument follows, get it, too
 352                 // Do it here only for single character commands. Other
 353                 // combining commands need this too, but they are handled in
 354                 // the loop below for performance reasons.
 355                 if (j + 1 < cmdend && cmd[j + 1] == '{') {
 356                         size_t k = j + 1;
 357                         int count = 1;
 358                         while (k < cmdend && count) {
 359                                 k = cmd.find_first_of(from_ascii("{}"), k + 1);
 360                                 // braces may not be balanced
 361                                 if (k == docstring::npos)
 362                                         break;
 363                                 if (cmd[k] == '{')
 364                                         ++count;
 365                                 else
 366                                         --count;
 367                         }
 368                         if (k != docstring::npos)
 369                                 j = k;
 370                 } else if (m + 1 < cmdend && isAlphaASCII(cmd[m])) {
 371                         while (m + 2 < cmdend && isAlphaASCII(cmd[m+1]))
 372                                 m++;
 373                 }
 374                 // Start with this substring and try augmenting it when it is
 375                 // the prefix of some command in the unicodesymbols file
 376                 docstring subcmd = cmd.substr(i, j - i + 1);
 377
 378                 CharInfoMap::const_iterator it = unicodesymbols.begin();
 379                 // First part of subcmd which might be a combining character
 380                 docstring combcmd = (m == j) ? docstring() : cmd.substr(i, m - i + 1);
 381                 // The combining character of combcmd if it exists
 382                 CharInfoMap::const_iterator combining = uniend;
 383                 size_t unicmd_size = 0;
 384                 char_type c = 0;
 385                 for (; it != uniend; ++it) {
 386                         docstring const math = mathmode ? it->second.mathcommand()
 387                                                         : docstring();
 388                         docstring const text = textmode ? it->second.textcommand()
 389                                                         : docstring();
 390                         if (!combcmd.empty() && it->second.combining() &&
 391                             (math == combcmd || text == combcmd))
 392                                 combining = it;
 393                         size_t cur_size = max(math.size(), text.size());
 394                         // The current math or text unicode command cannot
 395                         // match, or we already matched a longer one
 396                         if (cur_size < subcmd.size() || cur_size <= unicmd_size)
 397                                 continue;
 398
 399                         docstring tmp = subcmd;
 400                         size_t k = j;
 401                         while (prefixIs(math, tmp) || prefixIs(text, tmp)) {
 402                                 ++k;
 403                                 if (k >= cmdend || cur_size <= tmp.size())
 404                                         break;
 405                                 tmp += cmd[k];
 406                         }
 407                         // No match
 408                         if (k == j)
 409                                 continue;
 410
 411                         // The last added char caused a mismatch, because
 412                         // we didn't exhaust the chars in cmd and didn't
 413                         // exceed the maximum size of the current unicmd
 414                         if (k < cmdend && cur_size > tmp.size())
 415                                 tmp.resize(tmp.size() - 1);
 416
 417                         // If this is an exact match, we found a (longer)
 418                         // matching entry in the unicodesymbols file.
 419                         if (math != tmp && text != tmp)
 420                                 continue;
 421                         // If we found a combining command, we need to append
 422                         // the macro argument if this has not been done above.
 423                         if (tmp == combcmd && combining != uniend &&
 424                             k < cmdend && cmd[k] == '{') {
 425                                 size_t l = k;
 426                                 int count = 1;
 427                                 while (l < cmdend && count) {
 428                                         l = cmd.find_first_of(from_ascii("{}"), l + 1);
 429                                         // braces may not be balanced
 430                                         if (l == docstring::npos)
 431                                                 break;
 432                                         if (cmd[l] == '{')
 433                                                 ++count;
 434                                         else
 435                                                 --count;
 436                                 }
 437                                 if (l != docstring::npos) {
 438                                         j = l;
 439                                         subcmd = cmd.substr(i, j - i + 1);
 440                                 }
 441                         }
 442                         // If the entry doesn't start with '\', we take note
 443                         // of the match and continue (this is not a ultimate
 444                         // acceptance, as some other entry may match a longer
 445                         // portion of the cmd string). However, if the entry
 446                         // does start with '\', we accept the match only if
 447                         // this is a valid macro, i.e., either it is a single
 448                         // (nonletter) char macro, or nothing else follows,
 449                         // or what follows is a nonletter char, or the last
 450                         // character is a }.
 451                         else if (tmp[0] != '\\'
 452                                    || (tmp.size() == prefix + 1 &&
 453                                        !isAlphaASCII(tmp[1]) &&
 454                                        (prefix == 1 || !isAlphaASCII(tmp[2])))
 455                                    || k == cmdend
 456                                    || !isAlphaASCII(cmd[k])
 457                                    || tmp[tmp.size() - 1] == '}'
 458                                  ) {
 459                                 c = it->first;
 460                                 j = k - 1;
 461                                 i = j + 1;
 462                                 unicmd_size = cur_size;
 463                                 if (math == tmp)
 464                                         needsTermination = !it->second.mathnotermination();
 465                                 else
 466                                         needsTermination = !it->second.textnotermination();
 467                                 if (req) {
 468                                         if (math == tmp && it->second.mathfeature() &&
 469                                             !it->second.mathpreamble().empty())
 470                                                 req->insert(it->second.mathpreamble());
 471                                         if (text == tmp && it->second.textfeature() &&
 472                                             !it->second.textpreamble().empty())
 473                                                 req->insert(it->second.textpreamble());
 474                                 }
 475                         }
 476                 }
 477                 if (unicmd_size)
 478                         symbols += c;
 479                 else if (combining != uniend &&
 480                          prefixIs(subcmd, combcmd + '{')) {
 481                         // We know that subcmd starts with combcmd and
 482                         // contains an argument in braces.
 483                         docstring const arg = subcmd.substr(
 484                                 combcmd.length() + 1,
 485                                 subcmd.length() - combcmd.length() - 2);
 486                         // If arg is a single character we can construct a
 487                         // combining sequence.
 488                         char_type a;
 489                         bool argcomb = false;
 490                         if (arg.size() == 1 && isAlnumASCII(arg[0]))
 491                                 a = arg[0];
 492                         else {
 493                                 // Use the version of fromLaTeXCommand() that
 494                                 // parses only one command, since we cannot
 495                                 // use more than one character.
 496                                 bool dummy = false;
 497                                 set<string> r;
 498                                 a = fromLaTeXCommand(arg, cmdtype, argcomb,
 499                                                      dummy, &r);
 500                                 if (a && req && !argcomb)
 501                                         req->insert(r.begin(), r.end());
 502                         }
 503                         if (a && !argcomb) {
 504                                 // In unicode the combining character comes
 505                                 // after its base
 506                                 symbols += a;
 507                                 symbols += combining->first;
 508                                 i = j + 1;
 509                                 unicmd_size = 2;
 510                         }
 511                 }
 512                 if (j + 1 == cmdend && !unicmd_size) {
 513                         // No luck. Return what remains
 514                         rem = cmd.substr(i);
 515                         if (needsTermination && !rem.empty()) {
 516                                 if (rem.substr(0, 2) == "{}") {
 517                                         rem = rem.substr(2);
 518                                         needsTermination = false;
 519                                 } else if (rem[0] == ' ') {
 520                                         needsTermination = false;
 521                                         // LaTeX would swallow all spaces
 522                                         rem = ltrim(rem);
 523                                 }
 524                         }
 525                 }
 526         }
 527         return symbols;
 528 }
 529
 530
 531 CharInfo const & Encodings::unicodeCharInfo(char_type c)
 532 {
 533         static CharInfo empty;
 534         CharInfoMap::const_iterator const it = unicodesymbols.find(c);
 535         return it != unicodesymbols.end() ? it->second : empty;
 536 }
 537
 538
 539 bool Encodings::isCombiningChar(char_type c)
 540 {
 541         CharInfoMap::const_iterator const it = unicodesymbols.find(c);
 542         if (it != unicodesymbols.end())
 543                 return it->second.combining();
 544         return false;
 545 }
 546
 547
 548 string const Encodings::TIPAShortcut(char_type c)
 549 {
 550         CharInfoMap::const_iterator const it = unicodesymbols.find(c);
 551         if (it != unicodesymbols.end())
 552                 return it->second.tipashortcut();
 553         return string();
 554 }
 555
 556
 557 bool Encodings::isKnownScriptChar(char_type const c, string & preamble)
 558 {
 559         CharInfoMap::const_iterator const it = unicodesymbols.find(c);
 560
 561         if (it == unicodesymbols.end())
 562                 return false;
 563
 564         if (it->second.textpreamble() != "textgreek" && it->second.textpreamble() != "textcyr")
 565                 return false;
 566
 567         if (preamble.empty()) {
 568                 preamble = it->second.textpreamble();
 569                 return true;
 570         }
 571         return it->second.textpreamble() == preamble;
 572 }
 573
 574
 575 bool Encodings::isMathAlpha(char_type c)
 576 {
 577         return mathalpha.count(c);
 578 }
 579
 580
 581 Encoding const *
 582 Encodings::fromLyXName(string const & name, bool allowUnsafe) const
 583 {
 584         EncodingList::const_iterator const it = encodinglist.find(name);
 585         if (!allowUnsafe && it->second.unsafe())
 586                 return 0;
 587         return it != encodinglist.end() ? &it->second : 0;
 588 }
 589
 590
 591 Encoding const *
 592 Encodings::fromLaTeXName(string const & n, int const & p, bool allowUnsafe) const
 593 {
 594         string name = n;
 595         // FIXME: if we have to test for too many of these synonyms,
 596         // we should instead extend the format of lib/encodings
 597         if (n == "ansinew")
 598                 name = "cp1252";
 599
 600         // We don't use find_if because it makes copies of the pairs in
 601         // the map.
 602         // This linear search is OK since we don't have many encodings.
 603         // Users could even optimize it by putting the encodings they use
 604         // most at the top of lib/encodings.
 605         EncodingList::const_iterator const end = encodinglist.end();
 606         for (EncodingList::const_iterator it = encodinglist.begin(); it != end; ++it)
 607                 if ((it->second.latexName() == name) && (it->second.package() & p)
 608                                 && (!it->second.unsafe() || allowUnsafe))
 609                         return &it->second;
 610         return 0;
 611 }
 612
 613
 614 Encoding const *
 615 Encodings::fromIconvName(string const & n, int const & p, bool allowUnsafe) const
 616 {
 617         EncodingList::const_iterator const end = encodinglist.end();
 618         for (EncodingList::const_iterator it = encodinglist.begin(); it != end; ++it)
 619                 if ((it->second.iconvName() == n) && (it->second.package() & p)
 620                                 && (!it->second.unsafe() || allowUnsafe))
 621                         return &it->second;
 622         return 0;
 623 }
 624
 625
 626 Encodings::Encodings()
 627 {}
 628
 629
 630 void Encodings::read(FileName const & encfile, FileName const & symbolsfile)
 631 {
 632         // We must read the symbolsfile first, because the Encoding
 633         // constructor depends on it.
 634         CharSetMap forcednotselected;
 635         Lexer symbolslex;
 636         symbolslex.setFile(symbolsfile);
 637         bool getNextToken = true;
 638         while (symbolslex.isOK()) {
 639                 char_type symbol;
 640
 641                 if (getNextToken) {
 642                         if (!symbolslex.next(true))
 643                                 break;
 644                 } else
 645                         getNextToken = true;
 646
 647                 istringstream is(symbolslex.getString());
 648                 // reading symbol directly does not work if
 649                 // char_type == wchar_t.
 650                 boost::uint32_t tmp;
 651                 if(!(is >> hex >> tmp))
 652                         break;
 653                 symbol = tmp;
 654
 655                 if (!symbolslex.next(true))
 656                         break;
 657                 docstring textcommand = symbolslex.getDocString();
 658                 if (!symbolslex.next(true))
 659                         break;
 660                 string textpreamble = symbolslex.getString();
 661                 if (!symbolslex.next(true))
 662                         break;
 663                 string sflags = symbolslex.getString();
 664
 665                 string tipashortcut;
 666                 int flags = 0;
 667
 668                 if (suffixIs(textcommand, '}'))
 669                         flags |= CharInfoTextNoTermination;
 670                 while (!sflags.empty()) {
 671                         string flag;
 672                         sflags = split(sflags, flag, ',');
 673                         if (flag == "combining") {
 674                                 flags |= CharInfoCombining;
 675                         } else if (flag == "force") {
 676                                 flags |= CharInfoForce;
 677                                 forced.insert(symbol);
 678                         } else if (prefixIs(flag, "force=")) {
 679                                 vector<string> encodings =
 680                                         getVectorFromString(flag.substr(6), ";");
 681                                 for (size_t i = 0; i < encodings.size(); ++i)
 682                                         forcedselected[encodings[i]].insert(symbol);
 683                                 flags |= CharInfoForceSelected;
 684                         } else if (prefixIs(flag, "force!=")) {
 685                                 vector<string> encodings =
 686                                         getVectorFromString(flag.substr(7), ";");
 687                                 for (size_t i = 0; i < encodings.size(); ++i)
 688                                         forcednotselected[encodings[i]].insert(symbol);
 689                                 flags |= CharInfoForceSelected;
 690                         } else if (flag == "mathalpha") {
 691                                 mathalpha.insert(symbol);
 692                         } else if (flag == "notermination=text") {
 693                                 flags |= CharInfoTextNoTermination;
 694                         } else if (flag == "notermination=math") {
 695                                 flags |= CharInfoMathNoTermination;
 696                         } else if (flag == "notermination=both") {
 697                                 flags |= CharInfoTextNoTermination;
 698                                 flags |= CharInfoMathNoTermination;
 699                         } else if (flag == "notermination=none") {
 700                                 flags &= ~CharInfoTextNoTermination;
 701                                 flags &= ~CharInfoMathNoTermination;
 702                         } else if (contains(flag, "tipashortcut=")) {
 703                                 tipashortcut = split(flag, '=');
 704                         } else {
 705                                 lyxerr << "Ignoring unknown flag `" << flag
 706                                        << "' for symbol `0x"
 707                                        << hex << symbol << dec
 708                                        << "'." << endl;
 709                         }
 710                 }
 711                 // mathcommand and mathpreamble have been added for 1.6.0.
 712                 // make them optional so that old files still work.
 713                 int const lineno = symbolslex.lineNumber();
 714                 bool breakout = false;
 715                 docstring mathcommand;
 716                 string mathpreamble;
 717                 if (symbolslex.next(true)) {
 718                         if (symbolslex.lineNumber() != lineno) {
 719                                 // line in old format without mathcommand and mathpreamble
 720                                 getNextToken = false;
 721                         } else {
 722                                 mathcommand = symbolslex.getDocString();
 723                                 if (suffixIs(mathcommand, '}'))
 724                                         flags |= CharInfoMathNoTermination;
 725                                 if (symbolslex.next(true)) {
 726                                         if (symbolslex.lineNumber() != lineno) {
 727                                                 // line in new format with mathcommand only
 728                                                 getNextToken = false;
 729                                         } else {
 730                                                 // line in new format with mathcommand and mathpreamble
 731                                                 mathpreamble = symbolslex.getString();
 732                                         }
 733                                 } else
 734                                         breakout = true;
 735                         }
 736                 } else {
 737                         breakout = true;
 738                 }
 739
 740                 // backward compatibility
 741                 if (mathpreamble == "esintoramsmath")
 742                         mathpreamble = "esint|amsmath";
 743
 744                 if (!textpreamble.empty())
 745                         if (textpreamble[0] != '\\')
 746                                 flags |= CharInfoTextFeature;
 747                 if (!mathpreamble.empty())
 748                         if (mathpreamble[0] != '\\')
 749                                 flags |= CharInfoMathFeature;
 750
 751                 CharInfo info = CharInfo(
 752                         textcommand, mathcommand,
 753                         textpreamble, mathpreamble,
 754                         tipashortcut, flags);
 755                 LYXERR(Debug::INFO, "Read unicode symbol " << symbol << " '"
 756                            << to_utf8(info.textcommand()) << "' '" << info.textpreamble()
 757                            << " '" << info.textfeature() << ' ' << info.textnotermination()
 758                            << ' ' << to_utf8(info.mathcommand()) << "' '" << info.mathpreamble()
 759                            << "' " << info.mathfeature() << ' ' << info.mathnotermination()
 760                            << ' ' << info.combining() << ' ' << info.force()
 761                            << ' ' << info.forceselected());
 762
 763                 // we assume that at least one command is nonempty when using unicodesymbols
 764                 if (info.isUnicodeSymbol()) {
 765                         unicodesymbols[symbol] = info;
 766                 }
 767
 768                 if (breakout)
 769                         break;
 770         }
 771
 772         // Now read the encodings
 773         enum {
 774                 et_encoding = 1,
 775                 et_end
 776         };
 777
 778         LexerKeyword encodingtags[] = {
 779                 { "encoding", et_encoding },
 780                 { "end", et_end }
 781         };
 782
 783         Lexer lex(encodingtags);
 784         lex.setFile(encfile);
 785         lex.setContext("Encodings::read");
 786         while (lex.isOK()) {
 787                 switch (lex.lex()) {
 788                 case et_encoding:
 789                 {
 790                         lex.next();
 791                         string const name = lex.getString();
 792                         lex.next();
 793                         string const latexname = lex.getString();
 794                         lex.next();
 795                         string const guiname = lex.getString();
 796                         lex.next();
 797                         string const iconvname = lex.getString();
 798                         lex.next();
 799                         string const width = lex.getString();
 800                         bool fixedwidth = false;
 801                         bool unsafe = false;
 802                         if (width == "fixed")
 803                                 fixedwidth = true;
 804                         else if (width == "variable")
 805                                 fixedwidth = false;
 806                         else if (width == "variableunsafe") {
 807                                 fixedwidth = false;
 808                                 unsafe = true;
 809                         }
 810                         else
 811                                 lex.printError("Unknown width");
 812
 813                         lex.next();
 814                         string const p = lex.getString();
 815                         Encoding::Package package = Encoding::none;
 816                         if (p == "none")
 817                                 package = Encoding::none;
 818                         else if (p == "inputenc")
 819                                 package = Encoding::inputenc;
 820                         else if (p == "CJK")
 821                                 package = Encoding::CJK;
 822                         else if (p == "japanese")
 823                                 package = Encoding::japanese;
 824                         else
 825                                 lex.printError("Unknown package");
 826
 827                         LYXERR(Debug::INFO, "Reading encoding " << name);
 828                         encodinglist[name] = Encoding(name, latexname,
 829                                 guiname, iconvname, fixedwidth, unsafe,
 830                                 package);
 831
 832                         if (lex.lex() != et_end)
 833                                 lex.printError("Missing end");
 834                         break;
 835                 }
 836                 case et_end:
 837                         lex.printError("Misplaced end");
 838                         break;
 839                 case Lexer::LEX_FEOF:
 840                         break;
 841                 default:
 842                         lex.printError("Unknown tag");
 843                         break;
 844                 }
 845         }
 846
 847         // Move all information from forcednotselected to forcedselected
 848         for (CharSetMap::const_iterator it1 = forcednotselected.begin(); it1 != forcednotselected.end(); ++it1) {
 849                 for (CharSetMap::iterator it2 = forcedselected.begin(); it2 != forcedselected.end(); ++it2) {
 850                         if (it2->first != it1->first)
 851                                 it2->second.insert(it1->second.begin(), it1->second.end());
 852                 }
 853         }
 854
 855 }
 856
 857
 858 } // namespace lyx