src/insets/InsetExternal.cpp

   1 /**
   2  * \file InsetExternal.cpp
   3  * This file is part of LyX, the document processor.
   4  * Licence details can be found in the file COPYING.
   5  *
   6  * \author Asger Alstrup Nielsen
   7  *
   8  * Full author contact details are available in file CREDITS.
   9  */
  10
  11 #include <config.h>
  12
  13 #include "InsetExternal.h"
  14 #include "insets/ExternalSupport.h"
  15 #include "insets/RenderButton.h"
  16 #include "insets/RenderGraphic.h"
  17 #include "insets/RenderPreview.h"
  18
  19 #include "Buffer.h"
  20 #include "BufferView.h"
  21 #include "Cursor.h"
  22 #include "DispatchResult.h"
  23 #include "Exporter.h"
  24 #include "FuncStatus.h"
  25 #include "FuncRequest.h"
  26 #include "LaTeXFeatures.h"
  27 #include "Lexer.h"
  28 #include "LyX.h" // use_gui
  29 #include "LyXRC.h"
  30 #include "MetricsInfo.h"
  31 #include "OutputParams.h"
  32
  33 #include "frontends/alert.h"
  34 #include "frontends/Application.h"
  35
  36 #include "graphics/PreviewLoader.h"
  37
  38 #include "support/convert.h"
  39 #include "support/debug.h"
  40 #include "support/ExceptionMessage.h"
  41 #include "support/filetools.h"
  42 #include "support/gettext.h"
  43 #include "support/lstrings.h"
  44 #include "support/lyxlib.h"
  45 #include "support/Translator.h"
  46
  47 #include <boost/bind.hpp>
  48
  49 #include <sstream>
  50
  51 using namespace std;
  52 using namespace lyx::support;
  53
  54 namespace {
  55
  56 unsigned int const defaultLyxScale = 100;
  57
  58 string defaultTemplateName;
  59
  60 } // namespace anon
  61
  62
  63 namespace lyx {
  64
  65 namespace Alert = frontend::Alert;
  66
  67 namespace external {
  68
  69 TempName::TempName()
  70 {
  71         FileName const tempname = FileName::tempName("lyxext");
  72         // must have an extension for the converter code to work correctly.
  73         tempname_ = FileName(tempname.absFilename() + ".tmp");
  74 }
  75
  76
  77 TempName::TempName(TempName const &)
  78 {
  79         tempname_ = TempName()();
  80 }
  81
  82
  83 TempName::~TempName()
  84 {
  85         tempname_.removeFile();
  86 }
  87
  88
  89 TempName & TempName::operator=(TempName const & other)
  90 {
  91         if (this != &other)
  92                 tempname_ = TempName()();
  93         return *this;
  94 }
  95
  96 } // namespace external
  97
  98
  99 InsetExternalParams::InsetExternalParams()
 100         : display(true),
 101           lyxscale(defaultLyxScale),
 102           draft(false)
 103 {
 104         if (defaultTemplateName.empty()) {
 105                 external::TemplateManager const & etm =
 106                         external::TemplateManager::get();
 107                 if (!etm.getTemplates().empty())
 108                         templatename_ = etm.getTemplates().begin()->first;
 109         } else
 110                 templatename_ = defaultTemplateName;
 111 }
 112
 113
 114 namespace {
 115
 116 template <typename T>
 117 void clearIfNotFound(T & data, external::TransformID value,
 118                      vector<external::TransformID> const & ids)
 119 {
 120         typedef vector<external::TransformID>::const_iterator
 121                 const_iterator;
 122
 123         const_iterator it  = ids.begin();
 124         const_iterator end = ids.end();
 125         it = find(it, end, value);
 126         if (it == end)
 127                 data = T();
 128 }
 129
 130 } // namespace anon
 131
 132
 133 void InsetExternalParams::settemplate(string const & name)
 134 {
 135         templatename_ = name;
 136
 137         external::TemplateManager const & etm =
 138                 external::TemplateManager::get();
 139         external::Template const * const et = etm.getTemplateByName(name);
 140         if (!et)
 141                 // Be safe. Don't lose data.
 142                 return;
 143
 144         // Ascertain which transforms the template supports.
 145         // Empty all those that it doesn't.
 146         vector<external::TransformID> const & ids = et->transformIds;
 147         clearIfNotFound(clipdata,     external::Clip,   ids);
 148         clearIfNotFound(extradata,    external::Extra,  ids);
 149         clearIfNotFound(resizedata,   external::Resize, ids);
 150         clearIfNotFound(rotationdata, external::Rotate, ids);
 151
 152         //
 153         preview_mode = et->preview_mode;
 154 }
 155
 156
 157 void InsetExternalParams::write(Buffer const & buf, ostream & os) const
 158 {
 159         os << "External\n"
 160            << "\ttemplate " << templatename() << '\n';
 161
 162         if (!filename.empty())
 163                 os << "\tfilename " << filename.outputFilename(buf.filePath()) << '\n';
 164
 165         if (!display)
 166                 os << "\tdisplay false\n";
 167
 168         if (lyxscale != defaultLyxScale)
 169                 os << "\tlyxscale " << convert<string>(lyxscale) << '\n';
 170
 171         if (draft)
 172                 os << "\tdraft\n";
 173
 174         if (!clipdata.bbox.empty())
 175                 os << "\tboundingBox " << clipdata.bbox << '\n';
 176         if (clipdata.clip)
 177                 os << "\tclip\n";
 178
 179         external::ExtraData::const_iterator it  = extradata.begin();
 180         external::ExtraData::const_iterator end = extradata.end();
 181         for (; it != end; ++it) {
 182                 if (!it->second.empty())
 183                         os << "\textra " << it->first << " \""
 184                            << it->second << "\"\n";
 185         }
 186
 187         if (!rotationdata.no_rotation()) {
 188                 os << "\trotateAngle " << rotationdata.adjAngle() << '\n';
 189                 if (rotationdata.origin() != external::RotationData::DEFAULT)
 190                         os << "\trotateOrigin "
 191                            << rotationdata.originString() << '\n';
 192         }
 193
 194         if (!resizedata.no_resize()) {
 195                 double const scl = convert<double>(resizedata.scale);
 196                 if (!float_equal(scl, 0.0, 0.05)) {
 197                         if (!float_equal(scl, 100.0, 0.05))
 198                                 os << "\tscale "
 199                                    << resizedata.scale << '\n';
 200                 } else {
 201                         if (!resizedata.width.zero())
 202                                 os << "\twidth "
 203                                    << resizedata.width.asString() << '\n';
 204                         if (!resizedata.height.zero())
 205                                 os << "\theight "
 206                                    << resizedata.height.asString() << '\n';
 207                 }
 208                 if (resizedata.keepAspectRatio)
 209                         os << "\tkeepAspectRatio\n";
 210         }
 211 }
 212
 213
 214 bool InsetExternalParams::read(Buffer const & buffer, Lexer & lex)
 215 {
 216         enum {
 217                 EX_TEMPLATE = 1,
 218                 EX_FILENAME,
 219                 EX_DISPLAY,
 220                 EX_LYXSCALE,
 221                 EX_DRAFT,
 222                 EX_BOUNDINGBOX,
 223                 EX_CLIP,
 224                 EX_EXTRA,
 225                 EX_HEIGHT,
 226                 EX_KEEPASPECTRATIO,
 227                 EX_ROTATEANGLE,
 228                 EX_ROTATEORIGIN,
 229                 EX_SCALE,
 230                 EX_WIDTH,
 231                 EX_END
 232         };
 233
 234         LexerKeyword external_tags[] = {
 235                 { "\\end_inset",     EX_END },
 236                 { "boundingBox",     EX_BOUNDINGBOX },
 237                 { "clip",            EX_CLIP },
 238                 { "display",         EX_DISPLAY},
 239                 { "draft",           EX_DRAFT},
 240                 { "extra",           EX_EXTRA },
 241                 { "filename",        EX_FILENAME},
 242                 { "height",          EX_HEIGHT },
 243                 { "keepAspectRatio", EX_KEEPASPECTRATIO },
 244                 { "lyxscale",        EX_LYXSCALE},
 245                 { "rotateAngle",     EX_ROTATEANGLE },
 246                 { "rotateOrigin",    EX_ROTATEORIGIN },
 247                 { "scale",           EX_SCALE },
 248                 { "template",        EX_TEMPLATE },
 249                 { "width",           EX_WIDTH }
 250         };
 251
 252         PushPopHelper pph(lex, external_tags);
 253
 254         bool found_end  = false;
 255         bool read_error = false;
 256
 257         while (lex.isOK()) {
 258                 switch (lex.lex()) {
 259                 case EX_TEMPLATE:
 260                         lex.next();
 261                         templatename_ = lex.getString();
 262                         break;
 263
 264                 case EX_FILENAME: {
 265                         lex.eatLine();
 266                         string const name = lex.getString();
 267                         filename.set(name, buffer.filePath());
 268                         break;
 269                 }
 270
 271                 case EX_DISPLAY: {
 272                         lex.next();
 273                         display = lex.getString() != "false";
 274                         break;
 275                 }
 276
 277                 case EX_LYXSCALE:
 278                         lex.next();
 279                         lyxscale = lex.getInteger();
 280                         break;
 281
 282                 case EX_DRAFT:
 283                         draft = true;
 284                         break;
 285
 286                 case EX_BOUNDINGBOX:
 287                         lex.next();
 288                         clipdata.bbox.xl = lex.getInteger();
 289                         lex.next();
 290                         clipdata.bbox.yb = lex.getInteger();
 291                         lex.next();
 292                         clipdata.bbox.xr = lex.getInteger();
 293                         lex.next();
 294                         clipdata.bbox.yt = lex.getInteger();
 295                         break;
 296
 297                 case EX_CLIP:
 298                         clipdata.clip = true;
 299                         break;
 300
 301                 case EX_EXTRA: {
 302                         lex.next();
 303                         string const name = lex.getString();
 304                         lex.next();
 305                         extradata.set(name, lex.getString());
 306                         break;
 307                 }
 308
 309                 case EX_HEIGHT:
 310                         lex.next();
 311                         resizedata.height = Length(lex.getString());
 312                         break;
 313
 314                 case EX_KEEPASPECTRATIO:
 315                         resizedata.keepAspectRatio = true;
 316                         break;
 317
 318                 case EX_ROTATEANGLE:
 319                         lex.next();
 320                         rotationdata.angle = lex.getString();
 321                         break;
 322
 323                 case EX_ROTATEORIGIN:
 324                         lex.next();
 325                         rotationdata.origin(lex.getString());
 326                         break;
 327
 328                 case EX_SCALE:
 329                         lex.next();
 330                         resizedata.scale = lex.getString();
 331                         break;
 332
 333                 case EX_WIDTH:
 334                         lex.next();
 335                         resizedata.width = Length(lex.getString());
 336                         break;
 337
 338                 case EX_END:
 339                         found_end = true;
 340                         break;
 341
 342                 default:
 343                         lex.printError("ExternalInset::read: Wrong tag: $$Token");
 344                         read_error = true;
 345                         break;
 346                 }
 347
 348                 if (found_end || read_error)
 349                         break;
 350         }
 351
 352         if (!found_end)
 353                 lex.printError("ExternalInsetParams::read: Missing \\end_inset.");
 354
 355         // This is a trick to make sure that the data are self-consistent.
 356         settemplate(templatename_);
 357
 358         if (lyxerr.debugging(Debug::EXTERNAL)) {
 359                 lyxerr  << "InsetExternalParams::read:\n";
 360                 write(buffer, lyxerr);
 361         }
 362
 363         return !read_error;
 364 }
 365
 366
 367 InsetExternal::InsetExternal(Buffer & buf)
 368         : renderer_(new RenderButton)
 369 {
 370         Inset::setBuffer(buf);
 371 }
 372
 373
 374 InsetExternal::InsetExternal(InsetExternal const & other)
 375         : Inset(other),
 376           boost::signals::trackable(),
 377           params_(other.params_),
 378           renderer_(other.renderer_->clone(this))
 379 {}
 380
 381
 382 InsetExternal::~InsetExternal()
 383 {
 384         hideDialogs("external", this);
 385 }
 386
 387
 388 void InsetExternal::statusChanged() const
 389 {
 390         updateFrontend();
 391 }
 392
 393
 394 void InsetExternal::doDispatch(Cursor & cur, FuncRequest & cmd)
 395 {
 396         switch (cmd.action) {
 397
 398         case LFUN_INSET_EDIT: {
 399                 InsetExternalParams p =  params();
 400                 if (!cmd.argument().empty())
 401                         string2params(to_utf8(cmd.argument()), buffer(), p);
 402                 external::editExternal(p, buffer());
 403                 break;
 404         }
 405
 406         case LFUN_INSET_MODIFY: {
 407                 InsetExternalParams p;
 408                 string2params(to_utf8(cmd.argument()), buffer(), p);
 409                 setParams(p);
 410                 break;
 411         }
 412
 413         case LFUN_INSET_DIALOG_UPDATE:
 414                 cur.bv().updateDialog("external",
 415                         params2string(params(), cur.bv().buffer()));
 416                 break;
 417
 418         default:
 419                 Inset::doDispatch(cur, cmd);
 420         }
 421 }
 422
 423
 424 bool InsetExternal::getStatus(Cursor & cur, FuncRequest const & cmd,
 425                 FuncStatus & flag) const
 426 {
 427         switch (cmd.action) {
 428
 429         case LFUN_INSET_EDIT:
 430         case LFUN_INSET_MODIFY:
 431         case LFUN_INSET_DIALOG_UPDATE:
 432                 flag.setEnabled(true);
 433                 return true;
 434
 435         default:
 436                 return Inset::getStatus(cur, cmd, flag);
 437         }
 438 }
 439
 440
 441 bool InsetExternal::showInsetDialog(BufferView * bv) const
 442 {
 443         bv->showDialog("external", params2string(params(), bv->buffer()),
 444                 const_cast<InsetExternal *>(this));
 445         return true;
 446 }
 447
 448
 449 void InsetExternal::metrics(MetricsInfo & mi, Dimension & dim) const
 450 {
 451         renderer_->metrics(mi, dim);
 452 }
 453
 454
 455 void InsetExternal::draw(PainterInfo & pi, int x, int y) const
 456 {
 457         renderer_->draw(pi, x, y);
 458 }
 459
 460
 461 namespace {
 462
 463 graphics::Params get_grfx_params(InsetExternalParams const & eparams)
 464 {
 465         graphics::Params gparams;
 466
 467         gparams.filename = eparams.filename;
 468         gparams.scale = eparams.lyxscale;
 469         if (eparams.clipdata.clip)
 470                 gparams.bb = eparams.clipdata.bbox;
 471         gparams.angle = convert<double>(eparams.rotationdata.adjAngle());
 472         gparams.display = eparams.display;
 473
 474         return gparams;
 475 }
 476
 477
 478 docstring screenLabel(InsetExternalParams const & params,
 479                             Buffer const & buffer)
 480 {
 481         external::Template const * const ptr =
 482                 external::getTemplatePtr(params);
 483         if (!ptr)
 484                 // FIXME UNICODE
 485                 return bformat((_("External template %1$s is not installed")),
 486                                         from_utf8(params.templatename()));
 487         // FIXME UNICODE
 488         docstring gui = _(ptr->guiName);
 489         return from_utf8(external::doSubstitution(params, buffer,
 490                                 to_utf8(gui), false));
 491 }
 492
 493 } // namespace anon
 494
 495
 496 static bool isPreviewWanted(InsetExternalParams const & params)
 497 {
 498         return params.display && params.filename.isReadableFile();
 499 }
 500
 501
 502 static docstring latexString(InsetExternal const & inset)
 503 {
 504         odocstringstream os;
 505         // We don't need to set runparams.encoding since it is not used by
 506         // latex().
 507         OutputParams runparams(0);
 508         runparams.flavor = OutputParams::LATEX;
 509         inset.latex(os, runparams);
 510         return os.str();
 511 }
 512
 513
 514 static void add_preview_and_start_loading(RenderMonitoredPreview & renderer,
 515                                    InsetExternal const & inset,
 516                                    Buffer const & buffer)
 517 {
 518         InsetExternalParams const & params = inset.params();
 519
 520         if (RenderPreview::status() != LyXRC::PREVIEW_OFF &&
 521             isPreviewWanted(params)) {
 522                 renderer.setAbsFile(params.filename);
 523                 docstring const snippet = latexString(inset);
 524                 renderer.addPreview(snippet, buffer);
 525                 renderer.startLoading(buffer);
 526         }
 527 }
 528
 529
 530 InsetExternalParams const & InsetExternal::params() const
 531 {
 532         return params_;
 533 }
 534
 535
 536 void InsetExternal::updatePreview()
 537 {
 538         setParams(params_);
 539 }
 540
 541
 542 void InsetExternal::setParams(InsetExternalParams const & p)
 543 {
 544         params_ = p;
 545
 546         // Subsequent calls to the InsetExternal::Params default constructor
 547         // will use this.
 548         defaultTemplateName = params_.templatename();
 549
 550         if (!external::getTemplatePtr(params_) || params_.filename.empty()
 551                 || !params_.display
 552                 || !lyxrc.display_graphics
 553                 || params_.preview_mode == PREVIEW_OFF
 554                 || (params_.preview_mode == PREVIEW_INSTANT
 555                     && RenderPreview::status() == LyXRC::PREVIEW_OFF)) {
 556                 RenderButton * button_ptr = renderer_->asButton();
 557                 if (!button_ptr) {
 558                         renderer_.reset(new RenderButton);
 559                         button_ptr = renderer_->asButton();
 560                 }
 561                 button_ptr->update(screenLabel(params_, buffer()), true);
 562                 return;
 563         }
 564
 565         switch (params_.preview_mode) {
 566         case PREVIEW_OFF:
 567                 // Already taken care of above.
 568                 LASSERT(false, return);
 569                 break;
 570         case PREVIEW_INSTANT: {
 571                 RenderMonitoredPreview * preview_ptr = renderer_->asMonitoredPreview();
 572                 renderer_.reset(new RenderMonitoredPreview(this));
 573                 preview_ptr = renderer_->asMonitoredPreview();
 574                 preview_ptr->fileChanged(boost::bind(&InsetExternal::fileChanged, this));
 575                 if (preview_ptr->monitoring())
 576                         preview_ptr->stopMonitoring();
 577                 add_preview_and_start_loading(*preview_ptr, *this, buffer());
 578                 break;
 579         }
 580         case PREVIEW_GRAPHICS: {
 581                 RenderGraphic * graphic_ptr = renderer_->asGraphic();
 582                 if (!graphic_ptr) {
 583                         renderer_.reset(new RenderGraphic(this));
 584                         graphic_ptr = renderer_->asGraphic();
 585                 }
 586                 graphic_ptr->update(get_grfx_params(params_));
 587                 break;
 588         }
 589         }
 590 }
 591
 592
 593 void InsetExternal::fileChanged() const
 594 {
 595         Buffer const * const buffer = updateFrontend();
 596         if (!buffer)
 597                 return;
 598
 599         RenderMonitoredPreview * const ptr = renderer_->asMonitoredPreview();
 600         LASSERT(ptr, /**/);
 601
 602         ptr->removePreview(*buffer);
 603         add_preview_and_start_loading(*ptr, *this, *buffer);
 604 }
 605
 606
 607 void InsetExternal::write(ostream & os) const
 608 {
 609         params_.write(buffer(), os);
 610 }
 611
 612
 613 void InsetExternal::read(Lexer & lex)
 614 {
 615         InsetExternalParams params;
 616         if (params.read(buffer(), lex))
 617                 setParams(params);
 618 }
 619
 620
 621 int InsetExternal::latex(odocstream & os, OutputParams const & runparams) const
 622 {
 623         if (params_.draft) {
 624                 // FIXME UNICODE
 625                 os << "\\fbox{\\ttfamily{}"
 626                    << from_utf8(params_.filename.outputFilename(buffer().filePath()))
 627                    << "}\n";
 628                 return 1;
 629         }
 630
 631         // "nice" means that the buffer is exported to LaTeX format but not
 632         // run through the LaTeX compiler.
 633         // If we're running through the LaTeX compiler, we should write the
 634         // generated files in the buffer's temporary directory.
 635         bool const external_in_tmpdir = !runparams.nice;
 636         bool const dryrun = runparams.dryrun || runparams.inComment;
 637
 638         // If the template has specified a PDFLaTeX output, then we try and
 639         // use that.
 640         if (runparams.flavor == OutputParams::PDFLATEX) {
 641                 external::Template const * const et_ptr =
 642                         external::getTemplatePtr(params_);
 643                 if (!et_ptr)
 644                         return 0;
 645                 external::Template const & et = *et_ptr;
 646
 647                 external::Template::Formats::const_iterator cit =
 648                         et.formats.find("PDFLaTeX");
 649
 650                 if (cit != et.formats.end()) {
 651                         return external::writeExternal(params_, "PDFLaTeX",
 652                                                        buffer(), os,
 653                                                        *(runparams.exportdata),
 654                                                        external_in_tmpdir,
 655                                                        dryrun);
 656                 }
 657         }
 658
 659         return external::writeExternal(params_, "LaTeX", buffer(), os,
 660                                        *(runparams.exportdata),
 661                                        external_in_tmpdir,
 662                                        dryrun);
 663 }
 664
 665
 666 int InsetExternal::plaintext(odocstream & os,
 667                              OutputParams const & runparams) const
 668 {
 669         os << '\n'; // output external material on a new line
 670         external::writeExternal(params_, "Ascii", buffer(), os,
 671                                 *(runparams.exportdata), false,
 672                                 runparams.dryrun || runparams.inComment);
 673         return PLAINTEXT_NEWLINE;
 674 }
 675
 676
 677 int InsetExternal::docbook(odocstream & os,
 678                            OutputParams const & runparams) const
 679 {
 680         return external::writeExternal(params_, "DocBook", buffer(), os,
 681                                        *(runparams.exportdata), false,
 682                                        runparams.dryrun || runparams.inComment);
 683 }
 684
 685
 686 docstring InsetExternal::xhtml(odocstream & /*os*/,
 687                         OutputParams const & /*rp*/) const
 688 {
 689 //      external::writeExternal(params_, "XHTML", buffer(), os,
 690 //                                     *(runparams.exportdata), false,
 691 //                                     runparams.dryrun || runparams.inComment);
 692         return docstring();
 693 }
 694
 695
 696 void InsetExternal::validate(LaTeXFeatures & features) const
 697 {
 698         if (params_.draft)
 699                 return;
 700
 701         external::Template const * const et_ptr =
 702                 external::getTemplatePtr(params_);
 703         if (!et_ptr)
 704                 return;
 705         external::Template const & et = *et_ptr;
 706
 707         string format;
 708         switch (features.runparams().flavor) {
 709         case OutputParams::LATEX:
 710                 format = "LaTeX";
 711                 break;
 712         case OutputParams::PDFLATEX:
 713         case OutputParams::XETEX:
 714                 format = "PDFLaTeX";
 715                 break;
 716         case OutputParams::XML:
 717                 format = "DocBook";
 718                 break;
 719         }
 720         external::Template::Formats::const_iterator cit =
 721                 et.formats.find(format);
 722
 723         if (cit == et.formats.end()) {
 724                 // If the template has not specified a PDFLaTeX output,
 725                 // we try the LaTeX format.
 726                 if (format == "PDFLaTeX") {
 727                         cit = et.formats.find("LaTeX");
 728                         if (cit == et.formats.end())
 729                                 return;
 730                 } else
 731                         return;
 732         }
 733
 734         // FIXME: We don't need that always
 735         features.require("lyxdot");
 736
 737         vector<string>::const_iterator it  = cit->second.requirements.begin();
 738         vector<string>::const_iterator end = cit->second.requirements.end();
 739         for (; it != end; ++it)
 740                 features.require(*it);
 741
 742         external::TemplateManager & etm = external::TemplateManager::get();
 743
 744         it  = cit->second.preambleNames.begin();
 745         end = cit->second.preambleNames.end();
 746         for (; it != end; ++it) {
 747                 string const preamble = etm.getPreambleDefByName(*it);
 748                 if (!preamble.empty())
 749                         features.addPreambleSnippet(preamble);
 750         }
 751 }
 752
 753
 754 void InsetExternal::addPreview(graphics::PreviewLoader & ploader) const
 755 {
 756         RenderMonitoredPreview * const ptr = renderer_->asMonitoredPreview();
 757         if (!ptr)
 758                 return;
 759
 760         if (isPreviewWanted(params())) {
 761                 ptr->setAbsFile(params_.filename);
 762                 docstring const snippet = latexString(*this);
 763                 ptr->addPreview(snippet, ploader);
 764         }
 765 }
 766
 767
 768 docstring InsetExternal::contextMenu(BufferView const &, int, int) const
 769 {
 770         return from_ascii("context-external");
 771 }
 772
 773
 774 void InsetExternal::string2params(string const & in, Buffer const & buffer,
 775         InsetExternalParams & params)
 776 {
 777         params = InsetExternalParams();
 778         if (in.empty())
 779                 return;
 780
 781         istringstream data(in);
 782         Lexer lex;
 783         lex.setStream(data);
 784
 785         string name;
 786         lex >> name;
 787         if (!lex || name != "external") {
 788                 LYXERR0("InsetExternal::string2params(" << in << ")\n"
 789                                           "Expected arg 1 to be \"external\"\n");
 790                 return;
 791         }
 792
 793         // This is part of the inset proper that is usually swallowed
 794         // by Text::readInset
 795         string id;
 796         lex >> id;
 797         if (!lex || id != "External") {
 798                 LYXERR0("InsetExternal::string2params(" << in << ")\n"
 799                                           "Expected arg 2 to be \"External\"\n");
 800                 return;
 801         }
 802
 803         params.read(buffer, lex);
 804 }
 805
 806
 807 string InsetExternal::params2string(InsetExternalParams const & params,
 808         Buffer const & buffer)
 809 {
 810         ostringstream data;
 811         data << "external" << ' ';
 812         params.write(buffer, data);
 813         data << "\\end_inset\n";
 814         return data.str();
 815 }
 816
 817 } // namespace lyx