src/insets/InsetListings.cpp

   1 /**
   2  * \file InsetListings.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Bo Peng
   7  * \author Jürgen Spitzmüller
   8  *
   9  * Full author contact details are available in file CREDITS.
  10  */
  11
  12 #include <config.h>
  13
  14 #include "InsetListings.h"
  15
  16 #include "Buffer.h"
  17 #include "BufferView.h"
  18 #include "BufferParams.h"
  19 #include "Counters.h"
  20 #include "Cursor.h"
  21 #include "DispatchResult.h"
  22 #include "Encoding.h"
  23 #include "FuncRequest.h"
  24 #include "FuncStatus.h"
  25 #include "InsetCaption.h"
  26 #include "Language.h"
  27 #include "LaTeXFeatures.h"
  28 #include "Lexer.h"
  29 #include "output_latex.h"
  30 #include "output_xhtml.h"
  31 #include "OutputParams.h"
  32 #include "TextClass.h"
  33 #include "TexRow.h"
  34 #include "texstream.h"
  35
  36 #include "support/debug.h"
  37 #include "support/docstream.h"
  38 #include "support/gettext.h"
  39 #include "support/lstrings.h"
  40 #include "support/lassert.h"
  41
  42 #include "frontends/alert.h"
  43 #include "frontends/Application.h"
  44
  45 #include "support/regex.h"
  46
  47 #include <sstream>
  48
  49 using namespace std;
  50 using namespace lyx::support;
  51
  52 namespace lyx {
  53
  54
  55 InsetListings::InsetListings(Buffer * buf, InsetListingsParams const & par)
  56         : InsetCaptionable(buf,"listing")
  57 {
  58         params_.setMinted(buffer().params().use_minted);
  59         status_ = par.status();
  60 }
  61
  62
  63 InsetListings::~InsetListings()
  64 {
  65         hideDialogs("listings", this);
  66 }
  67
  68
  69 Inset::DisplayType InsetListings::display() const
  70 {
  71         return params().isInline() || params().isFloat() ? Inline : AlignLeft;
  72 }
  73
  74
  75 docstring InsetListings::layoutName() const
  76 {
  77         if (buffer().params().use_minted)
  78                 return from_ascii("MintedListings");
  79         else
  80                 return from_ascii("Listings");
  81 }
  82
  83
  84 void InsetListings::write(ostream & os) const
  85 {
  86         os << "listings" << "\n";
  87         InsetListingsParams const & par = params();
  88         // parameter string is encoded to be a valid lyx token.
  89         string opt = par.encodedString();
  90         if (!opt.empty())
  91                 os << "lstparams \"" << opt << "\"\n";
  92         if (par.isInline())
  93                 os << "inline true\n";
  94         else
  95                 os << "inline false\n";
  96         InsetCaptionable::write(os);
  97 }
  98
  99
 100 void InsetListings::read(Lexer & lex)
 101 {
 102         while (lex.isOK()) {
 103                 lex.next();
 104                 string token = lex.getString();
 105                 if (token == "lstparams") {
 106                         lex.next();
 107                         string const value = lex.getString();
 108                         params().fromEncodedString(value);
 109                 } else if (token == "inline") {
 110                         lex.next();
 111                         params().setInline(lex.getBool());
 112                 } else {
 113                         // no special option, push back 'status' etc
 114                         lex.pushToken(token);
 115                         break;
 116                 }
 117         }
 118         InsetCaptionable::read(lex);
 119 }
 120
 121
 122 Encoding const * InsetListings::forcedEncoding(Encoding const * inner_enc,
 123                                                Encoding const * outer_enc) const
 124 {
 125         // The listings package cannot deal with multi-byte-encoded
 126         // glyphs, except for Xe/LuaTeX (with non-TeX fonts) or pLaTeX.
 127         // Minted can deal with all encodings.
 128         if (buffer().params().use_minted
 129                 || inner_enc->name() == "utf8-plain"
 130                 || inner_enc->package() == Encoding::japanese
 131                 || inner_enc->hasFixedWidth())
 132                 return 0;
 133
 134         // We try if there's a singlebyte encoding for the outer
 135         // language; if not, fall back to latin1.
 136         // Power-users can set inputenc to utf8-plain to bypass this workaround
 137         // and provide alternatives in the user-preamble.
 138         return (outer_enc->hasFixedWidth()) ?
 139                         outer_enc : encodings.fromLyXName("iso8859-1");
 140 }
 141
 142
 143 void InsetListings::latex(otexstream & os, OutputParams const & runparams) const
 144 {
 145         string param_string = params().params();
 146         // NOTE: I use {} to quote text, which is an experimental feature
 147         // of the listings package (see page 25 of the manual)
 148         bool const isInline = params().isInline();
 149         bool const use_minted = buffer().params().use_minted;
 150         static regex const reg1("(.*)(basicstyle=\\{)([^\\}]*)(\\\\ttfamily)([^\\}]*)(\\})(.*)");
 151         static regex const reg2("(.*)(basicstyle=\\{)([^\\}]*)(\\\\rmfamily)([^\\}]*)(\\})(.*)");
 152         static regex const reg3("(.*)(basicstyle=\\{)([^\\}]*)(\\\\sffamily)([^\\}]*)(\\})(.*)");
 153         static regex const reg4("(.*)(basicstyle=\\{)([^\\}]*)(\\\\(tiny|scriptsize|footnotesize|small|normalsize|large|Large))([^\\}]*)(\\})(.*)");
 154         static regex const reg5("(.*)(fontfamily=)(tt|sf|rm)(.*)");
 155         static regex const reg6("(.*)(fontsize=\\{)(\\\\(tiny|scriptsize|footnotesize|small|normalsize|large|Large))(\\})(.*)");
 156         if (use_minted) {
 157                 // If params have been entered with "listings", and then the user switched to "minted",
 158                 // we have params that need to be translated.
 159                 // FIXME: We should use a backend-abstract syntax in listings params instead!
 160                 // Substitute fontstyle option
 161                 smatch sub;
 162                 if (regex_match(param_string, sub, reg1))
 163                         param_string = sub.str(1) + "fontfamily=tt," + sub.str(2) + sub.str(3)
 164                                         + sub.str(5) + sub.str(6) + sub.str(7);
 165                 if (regex_match(param_string, sub, reg2))
 166                         param_string = sub.str(1) + "fontfamily=rm," + sub.str(2) + sub.str(3)
 167                                         + sub.str(5) + sub.str(6) + sub.str(7);
 168                 if (regex_match(param_string, sub, reg3))
 169                         param_string = sub.str(1) + "fontfamily=sf," + sub.str(2) + sub.str(3)
 170                                         + sub.str(5) + sub.str(6) + sub.str(7);
 171                 // as well as fontsize option
 172                 if (regex_match(param_string, sub, reg4))
 173                         param_string = sub.str(1) + "fontsize={" + sub.str(4) + sub.str(3) + sub.str(7) + sub.str(8);
 174         } else {
 175                 // And the same vice versa
 176                 // Substitute fontstyle option
 177                 smatch sub;
 178                 string basicstyle;
 179                 if (regex_match(param_string, sub, reg5)) {
 180                         basicstyle = "\\" + sub.str(3) + "family";
 181                         param_string = sub.str(1) + sub.str(4);
 182                 }
 183                 // as well as fontsize option
 184                 if (regex_match(param_string, sub, reg6)) {
 185                         basicstyle += sub.str(3);
 186                         param_string = sub.str(1) + sub.str(6);
 187                 }
 188                 if (!basicstyle.empty())
 189                         param_string = rtrim(param_string, ",") + ",basicstyle={" + basicstyle + "}";
 190         }
 191         if (runparams.use_polyglossia && runparams.local_font->isRightToLeft()) {
 192                 // We need to use the *latin switches (#11554)
 193                 smatch sub;
 194                 if (regex_match(param_string, sub, reg1))
 195                         param_string = sub.str(1) + sub.str(2) + sub.str(3) + sub.str(4)
 196                                         + "latin"  + sub.str(5) + sub.str(6) + sub.str(7);
 197                 if (regex_match(param_string, sub, reg2))
 198                         param_string = sub.str(1) + sub.str(2) + sub.str(3) + sub.str(4)
 199                                         + "latin"  + sub.str(5) + sub.str(6) + sub.str(7);
 200                 if (regex_match(param_string, sub, reg3))
 201                         param_string = sub.str(1) + sub.str(2) + sub.str(3) + sub.str(4)
 202                                         + "latin"  + sub.str(5) + sub.str(6) + sub.str(7);
 203         }
 204         string minted_language;
 205         string float_placement;
 206         bool const isfloat = params().isFloat();
 207         if (use_minted && (isfloat || contains(param_string, "language="))) {
 208                 // Get float placement and/or language of the code,
 209                 // then remove the relative options.
 210                 vector<string> opts =
 211                         getVectorFromString(param_string, ",", false);
 212                 for (size_t i = 0; i < opts.size(); ++i) {
 213                         if (prefixIs(opts[i], "float")) {
 214                                 if (prefixIs(opts[i], "float="))
 215                                         float_placement = opts[i].substr(6);
 216                                 opts.erase(opts.begin() + int(i--));
 217                         }
 218                         else if (prefixIs(opts[i], "language=")) {
 219                                 minted_language = opts[i].substr(9);
 220                                 opts.erase(opts.begin() + int(i--));
 221                         }
 222                 }
 223                 param_string = getStringFromVector(opts, ",");
 224         }
 225         // Minted needs a language specification
 226         if (minted_language.empty()) {
 227                 // If a language has been set globally, use that,
 228                 // otherwise use TeX by default
 229                 string const & blp = buffer().params().listings_params;
 230                 size_t start = blp.find("language=");
 231                 if (start != string::npos) {
 232                         start += strlen("language=");
 233                         size_t len = blp.find(",", start);
 234                         if (len != string::npos)
 235                                 len -= start;
 236                         minted_language = blp.substr(start, len);
 237                 } else
 238                         minted_language = "TeX";
 239         }
 240
 241         // get the paragraphs. We can not output them directly to given odocstream
 242         // because we can not yet determine the delimiter character of \lstinline
 243         docstring code;
 244         docstring uncodable;
 245         ParagraphList::const_iterator par = paragraphs().begin();
 246         ParagraphList::const_iterator end = paragraphs().end();
 247
 248         bool encoding_switched = false;
 249         Encoding const * const save_enc = runparams.encoding;
 250
 251         Encoding const * const outer_encoding =
 252                 (runparams.local_font != 0) ?
 253                         runparams.local_font->language()->encoding()
 254                         : buffer().params().language->encoding();
 255         Encoding const * fixedlstenc = forcedEncoding(runparams.encoding, outer_encoding);
 256         if (fixedlstenc) {
 257                 // We need to switch to a singlebyte encoding, due to
 258                 // the restrictions of the listings package (see above).
 259                 // This needs to be consistent with
 260                 // LaTeXFeatures::getTClassI18nPreamble().
 261                 // We need to put this into a group in order to prevent encoding leaks
 262                 // (happens with cprotect).
 263                 os << "\\bgroup";
 264                 switchEncoding(os.os(), buffer().params(), runparams, *fixedlstenc, true);
 265                 runparams.encoding = fixedlstenc;
 266                 encoding_switched = true;
 267         }
 268
 269         bool const captionfirst = !isfloat && par->isInset(0)
 270                                 && par->getInset(0)->lyxCode() == CAPTION_CODE;
 271
 272         while (par != end) {
 273                 pos_type const siz = par->size();
 274                 bool captionline = false;
 275                 for (pos_type i = 0; i < siz; ++i) {
 276                         if (i == 0 && par->isInset(i) && i + 1 == siz)
 277                                 captionline = true;
 278                         // ignore all struck out text and (caption) insets
 279                         if (par->isDeleted(i)
 280                             || (par->isInset(i) && par->getInset(i)->lyxCode() == CAPTION_CODE))
 281                                 continue;
 282                         if (par->isInset(i)) {
 283                                 // Currently, this can only be a quote inset
 284                                 // that is output as plain quote here, but
 285                                 // we use more generic code anyway.
 286                                 otexstringstream ots;
 287                                 OutputParams rp = runparams;
 288                                 rp.pass_thru = true;
 289                                 par->getInset(i)->latex(ots, rp);
 290                                 code += ots.str();
 291                                 continue;
 292                         }
 293                         char_type c = par->getChar(i);
 294                         // we can only output characters covered by the current
 295                         // encoding!
 296                         try {
 297                                 if (runparams.encoding->encodable(c))
 298                                         code += c;
 299                                 else if (runparams.dryrun) {
 300                                         code += "<" + _("LyX Warning: ")
 301                                            + _("uncodable character") + " '";
 302                                         code += docstring(1, c);
 303                                         code += "'>";
 304                                 } else
 305                                         uncodable += c;
 306                         } catch (EncodingException & /* e */) {
 307                                 if (runparams.dryrun) {
 308                                         code += "<" + _("LyX Warning: ")
 309                                            + _("uncodable character") + " '";
 310                                         code += docstring(1, c);
 311                                         code += "'>";
 312                                 } else
 313                                         uncodable += c;
 314                         }
 315                 }
 316                 ++par;
 317                 // for the inline case, if there are multiple paragraphs
 318                 // they are simply joined. Otherwise, expect latex errors.
 319                 if (par != end && !isInline && !captionline)
 320                         code += "\n";
 321         }
 322         if (isInline) {
 323                 static const docstring delimiters =
 324                                 from_utf8("!*()-=+|;:'\"`,<.>/?QWERTYUIOPASDFGHJKLZXCVBNMqwertyuiopasdfghjklzxcvbnm");
 325
 326                 size_t pos = delimiters.find_first_not_of(code);
 327
 328                 // This code piece contains all possible special character? !!!
 329                 // Replace ! with a warning message and use ! as delimiter.
 330                 if (pos == string::npos) {
 331                         docstring delim_error = "<" + _("LyX Warning: ")
 332                                 + _("no more lstline delimiters available") + ">";
 333                         code = subst(code, from_ascii("!"), delim_error);
 334                         pos = 0;
 335                         if (!runparams.dryrun && !runparams.silent) {
 336                                 // FIXME: warning should be passed to the error dialog
 337                                 frontend::Alert::warning(_("Running out of delimiters"),
 338                                 _("For inline program listings, one character must be reserved\n"
 339                                   "as a delimiter. One of the listings, however, uses all available\n"
 340                                   "characters, so none is left for delimiting purposes.\n"
 341                                   "For the time being, I have replaced '!' by a warning, but you\n"
 342                                   "must investigate!"));
 343                         }
 344                 }
 345                 docstring const delim(1, delimiters[pos]);
 346                 if (use_minted) {
 347                         os << "\\mintinline";
 348                         if (!param_string.empty())
 349                                 os << "[" << from_utf8(param_string) << "]";
 350                         os << "{" << ascii_lowercase(minted_language) << "}";
 351                 } else {
 352                         os << "\\lstinline";
 353                         if (!param_string.empty())
 354                                 os << "[" << from_utf8(param_string) << "]";
 355                         else if (pos >= delimiters.find('Q'))
 356                                 // We need to terminate the command before
 357                                 // the delimiter
 358                                 os << " ";
 359                 }
 360                 os << delim << code << delim;
 361         } else if (use_minted) {
 362                 OutputParams rp = runparams;
 363                 rp.moving_arg = true;
 364                 TexString caption = getCaption(rp);
 365                 if (isfloat) {
 366                         os << breakln << "\\begin{listing}";
 367                         if (!float_placement.empty())
 368                                 os << '[' << float_placement << "]";
 369                 } else if (captionfirst && !caption.str.empty()) {
 370                         os << breakln << "\\lyxmintcaption[t]{"
 371                            << move(caption) << "}\n";
 372                 }
 373                 os << breakln << "\\begin{minted}";
 374                 if (!param_string.empty())
 375                         os << "[" << param_string << "]";
 376                 os << "{" << ascii_lowercase(minted_language) << "}\n"
 377                    << code << breakln << "\\end{minted}\n";
 378                 if (isfloat) {
 379                         if (!caption.str.empty())
 380                                 os << "\\caption{" << move(caption) << "}\n";
 381                         os << "\\end{listing}\n";
 382                 } else if (!captionfirst && !caption.str.empty()) {
 383                         os << breakln << "\\lyxmintcaption[b]{"
 384                            << move(caption) << "}";
 385                 }
 386         } else {
 387                 OutputParams rp = runparams;
 388                 rp.moving_arg = true;
 389                 TexString caption = getCaption(rp);
 390                 os << breakln << "\\begin{lstlisting}";
 391                 if (param_string.empty() && caption.str.empty())
 392                         os << "\n";
 393                 else {
 394                         if (!runparams.nice)
 395                                 os << safebreakln;
 396                         os << "[";
 397                         if (!caption.str.empty()) {
 398                                 os << "caption={" << move(caption) << '}';
 399                                 if (!param_string.empty())
 400                                         os << ',';
 401                         }
 402                         os << from_utf8(param_string) << "]\n";
 403                 }
 404                 os << code << breakln << "\\end{lstlisting}\n";
 405         }
 406
 407         if (encoding_switched){
 408                 // Switch back
 409                 switchEncoding(os.os(), buffer().params(),
 410                                runparams, *save_enc, true, true);
 411                 os << "\\egroup" << breakln;
 412                 runparams.encoding = save_enc;
 413         }
 414
 415         if (!uncodable.empty() && !runparams.silent) {
 416                 // issue a warning about omitted characters
 417                 // FIXME: should be passed to the error dialog
 418                 if (fixedlstenc)
 419                         frontend::Alert::warning(_("Uncodable characters in listings inset"),
 420                                 bformat(_("The following characters in one of the program listings are\n"
 421                                           "not representable in the current encoding and have been omitted:\n%1$s.\n"
 422                                           "This is due to a restriction of the listings package, which does\n"
 423                                           "not support your encoding '%2$s'.\n"
 424                                           "Toggling 'Use non-TeX fonts' in Document > Settings...\n"
 425                                           "might help."),
 426                                 uncodable, _(runparams.encoding->guiName())));
 427                 else
 428                         frontend::Alert::warning(_("Uncodable characters in listings inset"),
 429                                 bformat(_("The following characters in one of the program listings are\n"
 430                                           "not representable in the current encoding and have been omitted:\n%1$s."),
 431                                 uncodable));
 432         }
 433 }
 434
 435
 436 docstring InsetListings::xhtml(XHTMLStream & os, OutputParams const & rp) const
 437 {
 438         odocstringstream ods;
 439         XHTMLStream out(ods);
 440
 441         bool const isInline = params().isInline();
 442         if (isInline)
 443                 out << html::CompTag("br");
 444         else {
 445                 out << html::StartTag("div", "class='float-listings'");
 446                 docstring caption = getCaptionHTML(rp);
 447                 if (!caption.empty())
 448                         out << html::StartTag("div", "class='listings-caption'")
 449                             << XHTMLStream::ESCAPE_NONE
 450                             << caption << html::EndTag("div");
 451         }
 452
 453         InsetLayout const & il = getLayout();
 454         string const & tag = il.htmltag();
 455         string attr = "class ='listings";
 456         string const lang = params().getParamValue("language");
 457         if (!lang.empty())
 458                 attr += " " + lang;
 459         attr += "'";
 460         out << html::StartTag(tag, attr);
 461         OutputParams newrp = rp;
 462         newrp.html_disable_captions = true;
 463         // We don't want to convert dashes here. That's the only conversion we
 464         // do for XHTML, so this is safe.
 465         newrp.pass_thru = true;
 466         docstring def = InsetText::insetAsXHTML(out, newrp, InsetText::JustText);
 467         out << html::EndTag(tag);
 468
 469         if (isInline) {
 470                 out << html::CompTag("br");
 471                 // escaping will already have been done
 472                 os << XHTMLStream::ESCAPE_NONE << ods.str();
 473         } else {
 474                 out << html::EndTag("div");
 475                 // In this case, this needs to be deferred, but we'll put it
 476                 // before anything the text itself deferred.
 477                 def = ods.str() + '\n' + def;
 478         }
 479         return def;
 480 }
 481
 482
 483 string InsetListings::contextMenuName() const
 484 {
 485         return "context-listings";
 486 }
 487
 488
 489 void InsetListings::doDispatch(Cursor & cur, FuncRequest & cmd)
 490 {
 491         switch (cmd.action()) {
 492
 493         case LFUN_INSET_MODIFY: {
 494                 cur.recordUndoInset(this);
 495                 InsetListings::string2params(to_utf8(cmd.argument()), params());
 496                 break;
 497         }
 498
 499         case LFUN_INSET_DIALOG_UPDATE:
 500                 cur.bv().updateDialog("listings", params2string(params()));
 501                 break;
 502
 503         default:
 504                 InsetCaptionable::doDispatch(cur, cmd);
 505                 break;
 506         }
 507 }
 508
 509
 510 bool InsetListings::getStatus(Cursor & cur, FuncRequest const & cmd,
 511         FuncStatus & status) const
 512 {
 513         switch (cmd.action()) {
 514                 case LFUN_INSET_MODIFY:
 515                 case LFUN_INSET_DIALOG_UPDATE:
 516                         status.setEnabled(true);
 517                         return true;
 518                 case LFUN_CAPTION_INSERT: {
 519                         // the inset outputs at most one caption
 520                         if (params().isInline() || getCaptionInset()) {
 521                                 status.setEnabled(false);
 522                                 return true;
 523                         }
 524                 }
 525                 // fall through
 526                 default:
 527                         return InsetCaptionable::getStatus(cur, cmd, status);
 528         }
 529 }
 530
 531
 532 docstring const InsetListings::buttonLabel(BufferView const & bv) const
 533 {
 534         // FIXME UNICODE
 535         if (decoration() == InsetLayout::CLASSIC)
 536                 return isOpen(bv) ? _("Listing") : getNewLabel(_("Listing"));
 537         else
 538                 return getNewLabel(_("Listing"));
 539 }
 540
 541
 542 void InsetListings::validate(LaTeXFeatures & features) const
 543 {
 544         features.useInsetLayout(getLayout());
 545         string param_string = params().params();
 546         if (buffer().params().use_minted) {
 547                 features.require("minted");
 548                 OutputParams rp = features.runparams();
 549                 if (!params().isFloat() && !getCaption(rp).str.empty())
 550                         features.require("lyxmintcaption");
 551                 if (features.usePolyglossia() && features.hasRTLLanguage())
 552                         // minted loads color, but color must be loaded before bidi
 553                         // (i.e., polyglossia)
 554                         features.require("color");
 555         } else {
 556                 features.require("listings");
 557                 if (contains(param_string, "\\color"))
 558                         features.require("color");
 559         }
 560         InsetCaptionable::validate(features);
 561 }
 562
 563
 564 bool InsetListings::showInsetDialog(BufferView * bv) const
 565 {
 566         bv->showDialog("listings", params2string(params()),
 567                 const_cast<InsetListings *>(this));
 568         return true;
 569 }
 570
 571
 572 TexString InsetListings::getCaption(OutputParams const & runparams) const
 573 {
 574         InsetCaption const * ins = getCaptionInset();
 575         if (ins == 0)
 576                 return TexString();
 577
 578         otexstringstream os;
 579         ins->getArgs(os, runparams);
 580         ins->getArgument(os, runparams);
 581
 582         // TODO: The code below should be moved to support, and then the test
 583         //       in ../tests should be moved there as well.
 584
 585         // the caption may contain \label{} but the listings
 586         // package prefer caption={}, label={}
 587         TexString cap = os.release();
 588         if (buffer().params().use_minted
 589             || !contains(cap.str, from_ascii("\\label{")))
 590                 return cap;
 591         // convert from
 592         //     blah1\label{blah2} blah3
 593         // to
 594         //     blah1 blah3},label={blah2
 595         // to form options
 596         //     caption={blah1 blah3},label={blah2}
 597         //
 598         // NOTE that } is not allowed in blah2.
 599         regex const reg("(.*)\\\\label\\{(.*?)\\}(.*)");
 600         string const new_cap("$1$3},label={$2");
 601         // Remove potential \protect'ion of \label.
 602         docstring capstr = subst(cap.str, from_ascii("\\protect\\label"),
 603                                  from_ascii("\\label"));
 604         // TexString validity: the substitution preserves the number of newlines.
 605         // Moreover we assume that $2 does not contain newlines, so that the texrow
 606         // information remains accurate.
 607         // Replace '\n' with an improbable character from Private Use Area-A
 608         // and then return to '\n' after the regex replacement.
 609         capstr = subst(capstr, char_type('\n'), 0xffffd);
 610         cap.str = subst(from_utf8(regex_replace(to_utf8(capstr), reg, new_cap)),
 611                         0xffffd, char_type('\n'));
 612         return cap;
 613 }
 614
 615
 616 void InsetListings::string2params(string const & in,
 617                                    InsetListingsParams & params)
 618 {
 619         params = InsetListingsParams();
 620         if (in.empty())
 621                 return;
 622         istringstream data(in);
 623         Lexer lex;
 624         lex.setStream(data);
 625         // discard "listings", which is only used to determine inset
 626         lex.next();
 627         params.read(lex);
 628 }
 629
 630
 631 string InsetListings::params2string(InsetListingsParams const & params)
 632 {
 633         ostringstream data;
 634         data << "listings" << ' ';
 635         params.write(data);
 636         return data.str();
 637 }
 638
 639
 640 } // namespace lyx