src/mathed/MathFactory.cpp

   1 /**
   2  * \file MathFactory.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 "MathFactory.h"
  14
  15 #include "InsetMathAMSArray.h"
  16 #include "InsetMathArray.h"
  17 #include "InsetMathBoldSymbol.h"
  18 #include "InsetMathBox.h"
  19 #include "InsetMathCancel.h"
  20 #include "InsetMathCancelto.h"
  21 #include "InsetMathCases.h"
  22 #include "InsetMathColor.h"
  23 #include "InsetMathDecoration.h"
  24 #include "InsetMathDots.h"
  25 #include "InsetMathEnsureMath.h"
  26 #include "InsetMathFont.h"
  27 #include "InsetMathFontOld.h"
  28 #include "InsetMathFrac.h"
  29 #include "InsetMathKern.h"
  30 #include "InsetMathLefteqn.h"
  31 #include "InsetMathOverset.h"
  32 #include "InsetMathPhantom.h"
  33 #include "InsetMathRef.h"
  34 #include "InsetMathRoot.h"
  35 #include "InsetMathSideset.h"
  36 #include "InsetMathSize.h"
  37 #include "InsetMathSpace.h"
  38 #include "InsetMathSpecialChar.h"
  39 #include "InsetMathSplit.h"
  40 #include "InsetMathSqrt.h"
  41 #include "InsetMathStackrel.h"
  42 #include "InsetMathSubstack.h"
  43 #include "InsetMathSymbol.h"
  44 #include "InsetMathTabular.h"
  45 #include "InsetMathUnderset.h"
  46 #include "InsetMathUnknown.h"
  47 #include "InsetMathHull.h"
  48 #include "InsetMathXArrow.h"
  49 #include "InsetMathXYMatrix.h"
  50 #include "InsetMathDiagram.h"
  51 #include "MacroTable.h"
  52 #include "MathMacro.h"
  53 #include "MathMacroArgument.h"
  54 #include "MathParser.h"
  55 #include "MathStream.h"
  56 #include "MathSupport.h"
  57
  58 #include "insets/InsetCommand.h"
  59 #include "insets/InsetSpace.h"
  60
  61 #include "support/debug.h"
  62 #include "support/docstream.h"
  63 #include "support/FileName.h"
  64 #include "support/filetools.h" // LibFileSearch
  65 #include "support/lstrings.h"
  66 #include "support/textutils.h"
  67
  68 #include "frontends/FontLoader.h"
  69
  70 #include "Buffer.h"
  71 #include "BufferParams.h"
  72 #include "Encoding.h"
  73 #include "LyX.h" // use_gui
  74 #include "OutputParams.h"
  75
  76 using namespace std;
  77 using namespace lyx::support;
  78
  79 namespace lyx {
  80
  81 bool has_math_fonts;
  82
  83
  84 namespace {
  85
  86 MathWordList theMathWordList;
  87
  88
  89 bool isMathFontAvailable(docstring & name)
  90 {
  91         if (!use_gui)
  92                 return false;
  93
  94         FontInfo f;
  95         augmentFont(f, name);
  96
  97         // Do we have the font proper?
  98         if (theFontLoader().available(f))
  99                 return true;
 100
 101         // can we fake it?
 102         if (name == "eufrak") {
 103                 name = from_ascii("lyxfakefrak");
 104                 return true;
 105         }
 106
 107         LYXERR(Debug::MATHED,
 108                 "font " << to_utf8(name) << " not available and I can't fake it");
 109         return false;
 110 }
 111
 112
 113 void initSymbols()
 114 {
 115         FileName const filename = libFileSearch(string(), "symbols");
 116         LYXERR(Debug::MATHED, "read symbols from " << filename);
 117         if (filename.empty()) {
 118                 lyxerr << "Could not find symbols file" << endl;
 119                 return;
 120         }
 121
 122         ifstream fs(filename.toFilesystemEncoding().c_str());
 123         string line;
 124         bool skip = false;
 125         while (getline(fs, line)) {
 126                 int charid     = 0;
 127                 int fallbackid = 0;
 128                 if (line.empty() || line[0] == '#')
 129                         continue;
 130
 131                 // special case of iffont/else/endif
 132                 if (line.size() >= 7 && line.substr(0, 6) == "iffont") {
 133                         istringstream is(line);
 134                         string tmp;
 135                         is >> tmp;
 136                         is >> tmp;
 137                         docstring t = from_utf8(tmp);
 138                         skip = !isMathFontAvailable(t);
 139                         continue;
 140                 } else if (line.size() >= 4 && line.substr(0, 4) == "else") {
 141                         skip = !skip;
 142                         continue;
 143                 } else if (line.size() >= 5 && line.substr(0, 5) == "endif") {
 144                         skip = false;
 145                         continue;
 146                 } else if (skip)
 147                         continue;
 148
 149                 // special case of pre-defined macros
 150                 if (line.size() > 8 && line.substr(0, 5) == "\\def\\") {
 151                         //lyxerr << "macro definition: '" << line << '\'' << endl;
 152                         istringstream is(line);
 153                         string macro;
 154                         string requires;
 155                         is >> macro >> requires;
 156                         MacroTable::iterator it = MacroTable::globalMacros().insert(
 157                                         0, from_utf8(macro), requires);
 158                         // If you change the following output, please adjust
 159                         // development/tools/generate_symbols_images.py.
 160                         LYXERR(Debug::MATHED, "read symbol '" << to_utf8(it->first)
 161                                 << "  inset: macro"
 162                                 << "  draw: 0"
 163                                 << "  extra: "
 164                                 << "  requires: " << requires << '\'');
 165                         continue;
 166                 }
 167
 168                 idocstringstream is(from_utf8(line));
 169                 latexkeys tmp;
 170                 is >> tmp.name >> tmp.inset;
 171                 if (isFontName(tmp.inset))
 172                         is >> charid >> fallbackid >> tmp.extra >> tmp.xmlname;
 173                 else
 174                         is >> tmp.extra;
 175                 // requires is optional
 176                 if (is) {
 177                         is >> tmp.requires;
 178                         // backward compatibility
 179                         if (tmp.requires == "esintoramsmath")
 180                                 tmp.requires = from_ascii("esint|amsmath");
 181                 } else {
 182                         LYXERR(Debug::MATHED, "skipping line '" << line << "'\n"
 183                                 << to_utf8(tmp.name) << ' ' << to_utf8(tmp.inset) << ' '
 184                                 << to_utf8(tmp.extra));
 185                         continue;
 186                 }
 187
 188                 if (isFontName(tmp.inset)) {
 189                         // tmp.inset _is_ the fontname here.
 190                         // create fallbacks if necessary
 191
 192                         // store requirements as long as we can
 193                         if (tmp.requires.empty()) {
 194                                 if (tmp.inset == "msa" || tmp.inset == "msb")
 195                                         tmp.requires = from_ascii("amssymb");
 196                                 else if (tmp.inset == "wasy")
 197                                         tmp.requires = from_ascii("wasysym");
 198                                 else if (tmp.inset == "mathscr")
 199                                         tmp.requires = from_ascii("mathrsfs");
 200                         }
 201
 202                         // symbol font is not available sometimes
 203                         docstring symbol_font = from_ascii("lyxsymbol");
 204
 205                         if (tmp.extra == "func" || tmp.extra == "funclim" || tmp.extra == "special") {
 206                                 LYXERR(Debug::MATHED, "symbol abuse for " << to_utf8(tmp.name));
 207                                 tmp.draw = tmp.name;
 208                         } else if (isMathFontAvailable(tmp.inset)) {
 209                                 LYXERR(Debug::MATHED, "symbol available for " << to_utf8(tmp.name));
 210                                 tmp.draw.push_back(char_type(charid));
 211                         } else if (fallbackid && isMathFontAvailable(symbol_font)) {
 212                                 if (tmp.inset == "cmex")
 213                                         tmp.inset = from_ascii("lyxsymbol");
 214                                 else
 215                                         tmp.inset = from_ascii("lyxboldsymbol");
 216                                 LYXERR(Debug::MATHED, "symbol fallback for " << to_utf8(tmp.name));
 217                                 tmp.draw.push_back(char_type(fallbackid));
 218                         } else {
 219                                 LYXERR(Debug::MATHED, "faking " << to_utf8(tmp.name));
 220                                 tmp.draw = tmp.name;
 221                                 tmp.inset = from_ascii("lyxtex");
 222                         }
 223                 } else {
 224                         // it's a proper inset
 225                         LYXERR(Debug::MATHED, "inset " << to_utf8(tmp.inset)
 226                                               << " used for " << to_utf8(tmp.name));
 227                 }
 228
 229                 if (theMathWordList.find(tmp.name) != theMathWordList.end())
 230                         LYXERR(Debug::MATHED, "readSymbols: inset " << to_utf8(tmp.name)
 231                                 << " already exists.");
 232                 else
 233                         theMathWordList[tmp.name] = tmp;
 234
 235                 // If you change the following output, please adjust
 236                 // development/tools/generate_symbols_images.py.
 237                 LYXERR(Debug::MATHED, "read symbol '" << to_utf8(tmp.name)
 238                         << "  inset: " << to_utf8(tmp.inset)
 239                         << "  draw: " << int(tmp.draw.empty() ? 0 : tmp.draw[0])
 240                         << "  extra: " << to_utf8(tmp.extra)
 241                         << "  requires: " << to_utf8(tmp.requires) << '\'');
 242         }
 243         docstring tmp = from_ascii("cmm");
 244         docstring tmp2 = from_ascii("cmsy");
 245         has_math_fonts = isMathFontAvailable(tmp) && isMathFontAvailable(tmp2);
 246 }
 247
 248
 249 bool isSpecialChar(docstring const & name)
 250 {
 251         if (name.size() != 1)
 252                 return  name == "textasciicircum" || name == "mathcircumflex" ||
 253                         name == "textasciitilde"  || name == "textbackslash";
 254
 255         char_type const c = name.at(0);
 256         return  c == '{' || c == '}' || c == '&' || c == '$' ||
 257                 c == '#' || c == '%' || c == '_';
 258 }
 259
 260
 261 } // namespace anon
 262
 263 MathWordList const & mathedWordList()
 264 {
 265         return theMathWordList;
 266 }
 267
 268
 269 void initMath()
 270 {
 271         static bool initialized = false;
 272         if (!initialized) {
 273                 initialized = true;
 274                 initParser();
 275                 initSymbols();
 276         }
 277 }
 278
 279
 280 bool ensureMath(WriteStream & os, bool needs_math_mode, bool macro)
 281 {
 282         bool brace = os.pendingBrace();
 283         os.pendingBrace(false);
 284         if (!os.latex())
 285                 return brace;
 286         if (os.textMode() && needs_math_mode) {
 287                 os << "\\ensuremath{";
 288                 os.textMode(false);
 289                 brace = true;
 290         } else if (macro && brace && !needs_math_mode) {
 291                 // This is a user defined macro, but not a MathMacro, so we
 292                 // cannot be sure what mode is needed. As it was entered in
 293                 // a text box, we restore the text mode.
 294                 os << '}';
 295                 os.textMode(true);
 296                 brace = false;
 297         }
 298         return brace;
 299 }
 300
 301
 302 int ensureMode(WriteStream & os, InsetMath::mode_type mode,
 303                 bool locked, bool ascii)
 304 {
 305         bool textmode = mode == InsetMath::TEXT_MODE;
 306         if (os.latex() && textmode && os.pendingBrace()) {
 307                 os.os() << '}';
 308                 os.pendingBrace(false);
 309                 os.pendingSpace(false);
 310                 os.textMode(true);
 311         }
 312         int oldmodes = os.textMode() ? 0x01 : 0;
 313         os.textMode(textmode);
 314         oldmodes |= os.lockedMode() ? 0x02 : 0;
 315         os.lockedMode(locked);
 316         oldmodes |= os.asciiOnly() ? 0x04 : 0;
 317         os.asciiOnly(ascii);
 318         return oldmodes;
 319 }
 320
 321
 322 latexkeys const * in_word_set(docstring const & str)
 323 {
 324         MathWordList::iterator it = theMathWordList.find(str);
 325         return it != theMathWordList.end() ? &(it->second) : 0;
 326 }
 327
 328
 329 MathAtom createInsetMath(char const * const s, Buffer * buf)
 330 {
 331         return createInsetMath(from_utf8(s), buf);
 332 }
 333
 334
 335 MathAtom createInsetMath(docstring const & s, Buffer * buf)
 336 {
 337         //lyxerr << "creating inset with name: '" << to_utf8(s) << '\'' << endl;
 338         if ((s == "ce" || s == "cf") && buf
 339             && buf->params().use_package("mhchem") == BufferParams::package_off)
 340                 return MathAtom(new MathMacro(buf, s));
 341
 342         latexkeys const * l = in_word_set(s);
 343         if (l) {
 344                 docstring const & inset = l->inset;
 345                 //lyxerr << " found inset: '" << inset << '\'' << endl;
 346                 if (inset == "ref")
 347                         return MathAtom(new InsetMathRef(buf, l->name));
 348                 if (inset == "overset")
 349                         return MathAtom(new InsetMathOverset(buf));
 350                 if (inset == "underset")
 351                         return MathAtom(new InsetMathUnderset(buf));
 352                 if (inset == "decoration")
 353                         return MathAtom(new InsetMathDecoration(buf, l));
 354                 if (inset == "space")
 355                         return MathAtom(new InsetMathSpace(to_ascii(l->name), ""));
 356                 if (inset == "dots")
 357                         return MathAtom(new InsetMathDots(l));
 358                 if (inset == "mbox")
 359                         // return MathAtom(new InsetMathMBox);
 360                         // InsetMathMBox is proposed to replace InsetMathBox,
 361                         // but is not ready yet (it needs a BufferView for
 362                         // construction)
 363                         return MathAtom(new InsetMathBox(buf, l->name));
 364 //              if (inset == "fbox")
 365 //                      return MathAtom(new InsetMathFBox(l));
 366                 if (inset == "style")
 367                         return MathAtom(new InsetMathSize(buf, l));
 368                 if (inset == "font")
 369                         return MathAtom(new InsetMathFont(buf, l));
 370                 if (inset == "oldfont")
 371                         return MathAtom(new InsetMathFontOld(buf, l));
 372                 if (inset == "matrix")
 373                         return MathAtom(new InsetMathAMSArray(buf, s));
 374                 if (inset == "split")
 375                         return MathAtom(new InsetMathSplit(buf, s));
 376                 if (inset == "big")
 377                         // we can't create a InsetMathBig, since the argument
 378                         // is missing.
 379                         return MathAtom(new InsetMathUnknown(s));
 380                 return MathAtom(new InsetMathSymbol(l));
 381         }
 382
 383         if (s.size() == 2 && s[0] == '#' && s[1] >= '1' && s[1] <= '9')
 384                 return MathAtom(new MathMacroArgument(s[1] - '0'));
 385         if (s.size() == 3 && s[0] == '\\' && s[1] == '#'
 386                         && s[2] >= '1' && s[2] <= '9')
 387                 return MathAtom(new MathMacroArgument(s[2] - '0'));
 388         if (s == "boxed")
 389                 return MathAtom(new InsetMathBoxed(buf));
 390         if (s == "fbox")
 391                 return MathAtom(new InsetMathFBox(buf));
 392         if (s == "framebox")
 393                 return MathAtom(new InsetMathMakebox(buf, true));
 394         if (s == "makebox")
 395                 return MathAtom(new InsetMathMakebox(buf, false));
 396         if (s == "kern")
 397                 return MathAtom(new InsetMathKern);
 398         if (s.substr(0, 8) == "xymatrix") {
 399                 char spacing_code = '\0';
 400                 Length spacing;
 401                 bool equal_spacing = false;
 402                 size_t const len = s.length();
 403                 size_t i = 8;
 404                 if (i < len && s[i] == '@') {
 405                         ++i;
 406                         if (i < len && s[i] == '!') {
 407                                 equal_spacing = true;
 408                                 ++i;
 409                                 if (i < len) {
 410                                         switch (s[i]) {
 411                                         case '0':
 412                                         case 'R':
 413                                         case 'C':
 414                                                 spacing_code = static_cast<char>(s[i]);
 415                                         }
 416                                 }
 417                         } else if (i < len) {
 418                                 switch (s[i]) {
 419                                 case 'R':
 420                                 case 'C':
 421                                 case 'M':
 422                                 case 'W':
 423                                 case 'H':
 424                                 case 'L':
 425                                         spacing_code = static_cast<char>(s[i]);
 426                                         ++i;
 427                                         break;
 428                                 }
 429                                 if (i < len && s[i] == '=') {
 430                                         ++i;
 431                                         spacing = Length(to_ascii(s.substr(i)));
 432                                 }
 433                         }
 434                 }
 435                 return MathAtom(new InsetMathXYMatrix(buf, spacing, spacing_code,
 436                         equal_spacing));
 437         }
 438
 439         if (s == "Diagram")
 440                 return MathAtom(new InsetMathDiagram(buf));
 441         if (s == "xrightarrow" || s == "xleftarrow")
 442                 return MathAtom(new InsetMathXArrow(buf, s));
 443         if (s == "split" || s == "alignedat")
 444                 return MathAtom(new InsetMathSplit(buf, s));
 445         if (s == "cases")
 446                 return MathAtom(new InsetMathCases(buf));
 447         if (s == "substack")
 448                 return MathAtom(new InsetMathSubstack(buf));
 449         if (s == "subarray" || s == "array")
 450                 return MathAtom(new InsetMathArray(buf, s, 1, 1));
 451         if (s == "sqrt")
 452                 return MathAtom(new InsetMathSqrt(buf));
 453         if (s == "root")
 454                 return MathAtom(new InsetMathRoot(buf));
 455         if (s == "tabular")
 456                 return MathAtom(new InsetMathTabular(buf, s, 1, 1));
 457         if (s == "stackrel")
 458                 return MathAtom(new InsetMathStackrel(buf, false));
 459         // This string value is only for math toolbar use, no LaTeX name
 460         if (s == "stackrelthree")
 461                 return MathAtom(new InsetMathStackrel(buf, true));
 462         if (s == "binom")
 463                 return MathAtom(new InsetMathBinom(buf, InsetMathBinom::BINOM));
 464         if (s == "dbinom")
 465                 return MathAtom(new InsetMathBinom(buf, InsetMathBinom::DBINOM));
 466         if (s == "tbinom")
 467                 return MathAtom(new InsetMathBinom(buf, InsetMathBinom::TBINOM));
 468         if (s == "choose")
 469                 return MathAtom(new InsetMathBinom(buf, InsetMathBinom::CHOOSE));
 470         if (s == "brace")
 471                 return MathAtom(new InsetMathBinom(buf, InsetMathBinom::BRACE));
 472         if (s == "brack")
 473                 return MathAtom(new InsetMathBinom(buf, InsetMathBinom::BRACK));
 474         if (s == "frac")
 475                 return MathAtom(new InsetMathFrac(buf));
 476         if (s == "cfrac")
 477                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::CFRAC));
 478         if (s == "dfrac")
 479                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::DFRAC));
 480         if (s == "tfrac")
 481                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::TFRAC));
 482         if (s == "over")
 483                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::OVER));
 484         if (s == "nicefrac")
 485                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::NICEFRAC));
 486         if (s == "unitfrac")
 487                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::UNITFRAC));
 488         // These string values are only for math toolbar use, no LaTeX names
 489         if (s == "unitfracthree")
 490                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::UNITFRAC, 3));
 491         if (s == "unitone")
 492                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::UNIT, 1));
 493         if (s == "unittwo")
 494                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::UNIT));
 495         if (s == "cfracleft")
 496                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::CFRACLEFT));
 497         if (s == "cfracright")
 498                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::CFRACRIGHT));
 499         //if (s == "infer")
 500         //      return MathAtom(new MathInferInset);
 501         if (s == "atop")
 502                 return MathAtom(new InsetMathFrac(buf, InsetMathFrac::ATOP));
 503         if (s == "lefteqn")
 504                 return MathAtom(new InsetMathLefteqn(buf));
 505         if (s == "boldsymbol")
 506                 return MathAtom(new InsetMathBoldSymbol(buf, InsetMathBoldSymbol::AMS_BOLD));
 507         if (s == "bm")
 508                 return MathAtom(new InsetMathBoldSymbol(buf, InsetMathBoldSymbol::BM_BOLD));
 509         if (s == "heavysymbol" || s == "hm")
 510                 return MathAtom(new InsetMathBoldSymbol(buf, InsetMathBoldSymbol::BM_HEAVY));
 511         if (s == "color" || s == "normalcolor")
 512                 return MathAtom(new InsetMathColor(buf, true));
 513         if (s == "textcolor")
 514                 return MathAtom(new InsetMathColor(buf, false));
 515         if (s == "hphantom")
 516                 return MathAtom(new InsetMathPhantom(buf, InsetMathPhantom::hphantom));
 517         if (s == "phantom")
 518                 return MathAtom(new InsetMathPhantom(buf, InsetMathPhantom::phantom));
 519         if (s == "vphantom")
 520                 return MathAtom(new InsetMathPhantom(buf, InsetMathPhantom::vphantom));
 521         if (s == "cancel")
 522                 return MathAtom(new InsetMathCancel(buf, InsetMathCancel::cancel));
 523         if (s == "bcancel")
 524                 return MathAtom(new InsetMathCancel(buf, InsetMathCancel::bcancel));
 525         if (s == "xcancel")
 526                 return MathAtom(new InsetMathCancel(buf, InsetMathCancel::xcancel));
 527         if (s == "cancelto")
 528                 return MathAtom(new InsetMathCancelto(buf));
 529         if (s == "smash")
 530                 return MathAtom(new InsetMathPhantom(buf, InsetMathPhantom::smash));
 531         if (s == "mathclap")
 532                 return MathAtom(new InsetMathPhantom(buf, InsetMathPhantom::mathclap));
 533         if (s == "mathllap")
 534                 return MathAtom(new InsetMathPhantom(buf, InsetMathPhantom::mathllap));
 535         if (s == "mathrlap")
 536                 return MathAtom(new InsetMathPhantom(buf, InsetMathPhantom::mathrlap));
 537         if (s == "ensuremath")
 538                 return MathAtom(new InsetMathEnsureMath(buf));
 539         if (s == "sideset")
 540                 return MathAtom(new InsetMathSideset(buf, true, true));
 541         // The following 3 string values are only for math toolbar use, no LaTeX names
 542         if (s == "sidesetr")
 543                 return MathAtom(new InsetMathSideset(buf, false, true));
 544         if (s == "sidesetl")
 545                 return MathAtom(new InsetMathSideset(buf, true, false));
 546         if (s == "sidesetn")
 547                 return MathAtom(new InsetMathSideset(buf, false, false));
 548         if (isSpecialChar(s))
 549                 return MathAtom(new InsetMathSpecialChar(s));
 550         if (s == " ")
 551                 return MathAtom(new InsetMathSpace(" ", ""));
 552
 553         if (s == "regexp")
 554                 return MathAtom(new InsetMathHull(buf, hullRegexp));
 555
 556         return MathAtom(new MathMacro(buf, s));
 557 }
 558
 559
 560 bool createInsetMath_fromDialogStr(docstring const & str, MathData & ar)
 561 {
 562         // An example str:
 563         // "ref LatexCommand ref\nreference \"sec:Title\"\n\\end_inset\n\n";
 564         docstring name;
 565         docstring body = split(str, name, ' ');
 566
 567         if (name == "ref") {
 568                 InsetCommandParams icp(REF_CODE);
 569                 // FIXME UNICODE
 570                 InsetCommand::string2params(to_utf8(str), icp);
 571                 Encoding const * const utf8 = encodings.fromLyXName("utf8");
 572                 OutputParams op(utf8);
 573                 mathed_parse_cell(ar, icp.getCommand(op));
 574         } else if (name == "mathspace") {
 575                 InsetSpaceParams isp(true);
 576                 InsetSpace::string2params(to_utf8(str), isp);
 577                 InsetSpace is(isp);
 578                 TexRow texrow;
 579                 odocstringstream ods;
 580                 otexstream os(ods, texrow);
 581                 Encoding const * const ascii = encodings.fromLyXName("ascii");
 582                 OutputParams op(ascii);
 583                 is.latex(os, op);
 584                 mathed_parse_cell(ar, ods.str());
 585                 if (ar.size() == 2) {
 586                         // remove "{}"
 587                         if (ar[1].nucleus()->asBraceInset())
 588                                 ar.pop_back();
 589                 }
 590         } else
 591                 return false;
 592
 593         if (ar.size() != 1)
 594                 return false;
 595
 596         return ar[0].nucleus();
 597 }
 598
 599
 600 bool isAsciiOrMathAlpha(char_type c)
 601 {
 602         return isASCII(c) || Encodings::isMathAlpha(c);
 603 }
 604
 605
 606 } // namespace lyx