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