src/mathed/formula.C

   1 /*
   2 *  File:        formula.C
   3 *  Purpose:     Implementation of formula inset
   4 *  Author:      Alejandro Aguilar Sierra <asierra@servidor.unam.mx>
   5 *  Created:     January 1996
   6 *  Description: Allows the edition of math paragraphs inside Lyx.
   7 *
   8 *  Copyright: 1996-1998 Alejandro Aguilar Sierra
   9 *
  10 *  Version: 0.4, Lyx project.
  11 *
  12 *   You are free to use and modify this code under the terms of
  13 *   the GNU General Public Licence version 2 or later.
  14 */
  15
  16 #ifdef __GNUG__
  17 #pragma implementation
  18 #endif
  19
  20 #include <config.h>
  21
  22 #include "formula.h"
  23 #include "commandtags.h"
  24 #include "math_cursor.h"
  25 #include "math_parser.h"
  26 #include "math_charinset.h"
  27 #include "math_arrayinset.h"
  28 #include "math_deliminset.h"
  29 #include "lyx_main.h"
  30 #include "BufferView.h"
  31 #include "gettext.h"
  32 #include "debug.h"
  33 #include "frontends/Alert.h"
  34 #include "support/LOstream.h"
  35 #include "support/LAssert.h"
  36 #include "support/systemcall.h"
  37 #include "support/filetools.h" // LibFileSearch
  38 #include "frontends/LyXView.h"
  39 #include "frontends/Painter.h"
  40 #include "lyxrc.h"
  41 #include "math_hullinset.h"
  42 #include "math_support.h"
  43 #include "math_mathmlstream.h"
  44 #include "textpainter.h"
  45 #include "preview.h"
  46
  47 using std::ostream;
  48 using std::ifstream;
  49 using std::istream;
  50 using std::pair;
  51 using std::endl;
  52 using std::vector;
  53 using std::getline;
  54
  55
  56 namespace {
  57
  58         string captureOutput(string const & cmd, string const & data)
  59         {
  60                 string outfile = lyx::tempName(string(), "mathextern");
  61                 string full =  "echo '" + data + "' | (" + cmd + ") > " + outfile;
  62                 lyxerr << "calling: " << full << "\n";
  63                 Systemcall dummy;
  64                 dummy.startscript(Systemcall::Wait, full);
  65                 string out = GetFileContents(outfile);
  66                 lyx::unlink(outfile);
  67                 lyxerr << "result: '" << out << "'\n";
  68                 return out;
  69         }
  70
  71
  72         MathArray pipeThroughMaple(string const & extra, MathArray const & ar)
  73         {
  74                 string header = "readlib(latex):\n";
  75
  76                 // remove the \\it for variable names
  77                 //"#`latex/csname_font` := `\\it `:"
  78                 header +=
  79                         "`latex/csname_font` := ``:\n";
  80
  81                 // export matrices in (...) instead of [...]
  82                 header +=
  83                         "`latex/latex/matrix` := "
  84                                 "subs(`[`=`(`, `]`=`)`,"
  85                                         "eval(`latex/latex/matrix`)):\n";
  86
  87                 // replace \\cdots with proper '*'
  88                 header +=
  89                         "`latex/latex/*` := "
  90                                 "subs(`\\,`=`\\cdot `,"
  91                                         "eval(`latex/latex/*`)):\n";
  92
  93                 // remove spurious \\noalign{\\medskip} in matrix output
  94                 header +=
  95                         "`latex/latex/matrix`:= "
  96                                 "subs(`\\\\\\\\\\\\noalign{\\\\medskip}` = `\\\\\\\\`,"
  97                                         "eval(`latex/latex/matrix`)):\n";
  98
  99                 //"#`latex/latex/symbol` "
 100                 //      " := subs((\\'_\\' = \\'`\\_`\\',eval(`latex/latex/symbol`)): ";
 101
 102                 string trailer = "quit;";
 103                 ostringstream os;
 104                 MapleStream ms(os);
 105                 ms << ar;
 106                 string expr = os.str().c_str();
 107                 lyxerr << "ar: '" << ar << "'\n";
 108
 109                 for (int i = 0; i < 100; ++i) { // at most 100 attempts
 110                         // try to fix missing '*' the hard way by using mint
 111                         //
 112                         // ... > echo "1A;" | mint -i 1 -S -s -q
 113                         // on line     1: 1A;
 114                         //                 ^ syntax error -
 115                         //                   Probably missing an operator such as * p
 116                         //
 117                         lyxerr << "checking expr: '" << expr << "'\n";
 118                         string out = captureOutput("mint -i 1 -S -s -q -q", expr + ";");
 119                         if (out.empty())
 120                                 break; // expression syntax is ok
 121                         istringstream is(out.c_str());
 122                         string line;
 123                         getline(is, line);
 124                         if (line.find("on line") != 0)
 125                                 break; // error message not identified
 126                         getline(is, line);
 127                         string::size_type pos = line.find('^');
 128                         if (pos == string::npos || pos < 15)
 129                                 break; // caret position not found
 130                         pos -= 15; // skip the "on line ..." part
 131                         if (expr[pos] == '*' || (pos > 0 && expr[pos - 1] == '*'))
 132                                 break; // two '*' in a row are definitely bad
 133                         expr.insert(pos,  "*");
 134                 }
 135
 136                 string full = "latex(" +  extra + '(' + expr + "));";
 137                 string out = captureOutput("maple -q", header + full + trailer);
 138
 139                 // change \_ into _
 140
 141                 //
 142                 MathArray res;
 143                 mathed_parse_cell(res, out);
 144                 return res;
 145         }
 146
 147
 148         MathArray pipeThroughOctave(string const &, MathArray const & ar)
 149         {
 150                 ostringstream os;
 151                 OctaveStream vs(os);
 152                 vs << ar;
 153                 string expr = os.str().c_str();
 154                 string out;
 155
 156                 for (int i = 0; i < 100; ++i) { // at most 100 attempts
 157                         //
 158                         // try to fix missing '*' the hard way
 159                         // parse error:
 160                         // >>> ([[1 2 3 ];[2 3 1 ];[3 1 2 ]])([[1 2 3 ];[2 3 1 ];[3 1 2 ]])
 161                         //                                   ^
 162                         //
 163                         lyxerr << "checking expr: '" << expr << "'\n";
 164                         out = captureOutput("octave -q 2>&1", expr);
 165                         lyxerr << "checking out: '" << out << "'\n";
 166
 167                         // leave loop if expression syntax is probably ok
 168                         if (out.find("parse error:") == string::npos)
 169                                 break;
 170
 171                         // search line with single caret
 172                         istringstream is(out.c_str());
 173                         string line;
 174                         while (is) {
 175                                 getline(is, line);
 176                                 lyxerr << "skipping line: '" << line << "'\n";
 177                                 if (line.find(">>> ") != string::npos)
 178                                         break;
 179                         }
 180
 181                         // found line with error, next line is the one with caret
 182                         getline(is, line);
 183                         string::size_type pos = line.find('^');
 184                         lyxerr << "caret line: '" << line << "'\n";
 185                         lyxerr << "found caret at pos: '" << pos << "'\n";
 186                         if (pos == string::npos || pos < 4)
 187                                 break; // caret position not found
 188                         pos -= 4; // skip the ">>> " part
 189                         if (expr[pos] == '*')
 190                                 break; // two '*' in a row are definitely bad
 191                         expr.insert(pos,  "*");
 192                 }
 193
 194                 if (out.size() < 6)
 195                         return MathArray();
 196
 197                 // remove 'ans = '
 198                 out = out.substr(6);
 199
 200                 // parse output as matrix or single number
 201                 MathAtom at(new MathArrayInset("array", out));
 202                 MathArrayInset const * mat = at.nucleus()->asArrayInset();
 203                 MathArray res;
 204                 if (mat->ncols() == 1 && mat->nrows() == 1)
 205                         res.push_back(mat->cell(0));
 206                 else {
 207                         res.push_back(MathAtom(new MathDelimInset("(", ")")));
 208                         res.back()->cell(0).push_back(at);
 209                 }
 210                 return res;
 211         }
 212
 213
 214         MathArray pipeThroughExtern(string const & lang, string const & extra,
 215                 MathArray const & ar)
 216         {
 217                 if (lang == "octave")
 218                         return pipeThroughOctave(extra, ar);
 219
 220                 if (lang == "maple")
 221                         return pipeThroughMaple(extra, ar);
 222
 223                 // create normalized expression
 224                 ostringstream os;
 225                 NormalStream ns(os);
 226                 os << "[" << extra << ' ';
 227                 ns << ar;
 228                 os << "]";
 229                 string data = os.str().c_str();
 230
 231                 // search external script
 232                 string file = LibFileSearch("mathed", "extern_" + lang);
 233                 if (file.empty()) {
 234                         lyxerr << "converter to '" << lang << "' not found\n";
 235                         return MathArray();
 236                 }
 237
 238                 // run external sript
 239                 string out = captureOutput(file, data);
 240                 MathArray res;
 241                 mathed_parse_cell(res, out);
 242                 return res;
 243         }
 244
 245 }
 246
 247
 248 InsetFormula::InsetFormula()
 249         : par_(MathAtom(new MathHullInset))
 250 {}
 251
 252
 253 InsetFormula::InsetFormula(MathInsetTypes t)
 254         : par_(MathAtom(new MathHullInset(t)))
 255 {}
 256
 257
 258 InsetFormula::InsetFormula(string const & s)
 259 {
 260         if (s.size()) {
 261                 bool res = mathed_parse_normal(par_, s);
 262
 263                 if (!res)
 264                         res = mathed_parse_normal(par_, "$" + s + "$");
 265
 266                 if (!res) {
 267                         lyxerr << "cannot interpret '" << s << "' as math\n";
 268                         par_ = MathAtom(new MathHullInset(LM_OT_SIMPLE));
 269                 }
 270         }
 271         metrics();
 272 }
 273
 274
 275 Inset * InsetFormula::clone(Buffer const &, bool) const
 276 {
 277         return new InsetFormula(*this);
 278 }
 279
 280
 281 void InsetFormula::write(Buffer const *, ostream & os) const
 282 {
 283         os << "Formula ";
 284         WriteStream wi(os, false, false);
 285         par_->write(wi);
 286 }
 287
 288
 289 int InsetFormula::latex(Buffer const *, ostream & os, bool fragile, bool) const
 290 {
 291         WriteStream wi(os, fragile, true);
 292         par_->write(wi);
 293         return wi.line();
 294 }
 295
 296
 297 int InsetFormula::ascii(Buffer const *, ostream & os, int) const
 298 {
 299 #if 0
 300         TextMetricsInfo mi;
 301         par()->metricsT(mi);
 302         TextPainter tpain(par()->width(), par()->height());
 303         par()->drawT(tpain, 0, par()->ascent());
 304         tpain.show(os);
 305         // reset metrics cache to "real" values
 306         metrics();
 307         return tpain.textheight();
 308 #else
 309         WriteStream wi(os, false, true);
 310         par_->write(wi);
 311         return wi.line();
 312 #endif
 313 }
 314
 315
 316 int InsetFormula::linuxdoc(Buffer const * buf, ostream & os) const
 317 {
 318         return docbook(buf, os);
 319 }
 320
 321
 322 int InsetFormula::docbook(Buffer const * buf, ostream & os) const
 323 {
 324         MathMLStream ms(os);
 325         ms << MTag("equation") << MTag("alt");
 326         int res = ascii(buf, ms.os(), 0);
 327         ms << ETag("alt") << MTag("math");
 328         ms << par_.nucleus();
 329         ms << ETag("math") << ETag("equation");
 330         return ms.line() + res;
 331 }
 332
 333
 334 void InsetFormula::read(Buffer const *, LyXLex & lex)
 335 {
 336         mathed_parse_normal(par_, lex);
 337         metrics();
 338 }
 339
 340
 341 //ostream & operator<<(ostream & os, LyXCursor const & c)
 342 //{
 343 //      os << '[' << c.x() << ' ' << c.y() << ' ' << c.pos() << ']';
 344 //      return os;
 345 //}
 346
 347
 348 void InsetFormula::draw(BufferView * bv, LyXFont const & font,
 349                         int y, float & xx, bool) const
 350 {
 351         metrics(bv, font);
 352
 353         int x = int(xx);
 354         int w = par_->width();
 355         int h = par_->height();
 356         int a = par_->ascent();
 357
 358         MathPainterInfo pi(bv->painter());
 359         pi.base.font  = font;
 360         pi.base.font.setColor(LColor::math);
 361         pi.base.style = display() ? LM_ST_DISPLAY : LM_ST_TEXT;
 362
 363         if (lcolor.getX11Name(LColor::mathbg)!=lcolor.getX11Name(LColor::background))
 364                 pi.pain.fillRectangle(x, y - a, w, h, LColor::mathbg);
 365
 366         if (mathcursor &&
 367                         const_cast<InsetFormulaBase const *>(mathcursor->formula()) == this)
 368         {
 369                 mathcursor->drawSelection(pi);
 370                 pi.pain.rectangle(x, y - a, w, h, LColor::mathframe);
 371         }
 372
 373         par_->draw(pi, x, y);
 374
 375         // preview stuff
 376 #if 0
 377         ostringstream os;
 378         WriteStream wi(os, false, false);
 379         par_->write(wi);
 380         if (grfx::ImagePtr image = preview(os.str()))
 381                 pain.image(x, y, w, h, *image);
 382 #endif
 383
 384         xx += par_->width();
 385         xo_ = x;
 386         yo_ = y;
 387
 388         setCursorVisible(false);
 389 }
 390
 391
 392 vector<string> const InsetFormula::getLabelList() const
 393 {
 394         return hull()->getLabelList();
 395 }
 396
 397
 398 UpdatableInset::RESULT
 399 InsetFormula::localDispatch(BufferView * bv, kb_action action,
 400          string const & arg)
 401 {
 402         RESULT result = DISPATCHED;
 403
 404         switch (action) {
 405
 406                 case LFUN_BREAKLINE:
 407                         bv->lockedInsetStoreUndo(Undo::INSERT);
 408                         mathcursor->breakLine();
 409                         mathcursor->normalize();
 410                         updateLocal(bv, true);
 411                         break;
 412
 413                 case LFUN_MATH_NUMBER:
 414                 {
 415                         //lyxerr << "toggling all numbers\n";
 416                         if (display()) {
 417                                 bv->lockedInsetStoreUndo(Undo::INSERT);
 418                                 bool old = hull()->numberedType();
 419                                 for (MathInset::row_type row = 0; row < par_->nrows(); ++row)
 420                                         hull()->numbered(row, !old);
 421                                 bv->owner()->message(old ? _("No number") : _("Number"));
 422                                 updateLocal(bv, true);
 423                         }
 424                         break;
 425                 }
 426
 427                 case LFUN_MATH_NONUMBER:
 428                 {
 429                         //lyxerr << "toggling line number\n";
 430                         if (display()) {
 431                                 bv->lockedInsetStoreUndo(Undo::INSERT);
 432                                 MathCursor::row_type row = mathcursor->hullRow();
 433                                 bool old = hull()->numbered(row);
 434                                 bv->owner()->message(old ? _("No number") : _("Number"));
 435                                 hull()->numbered(row, !old);
 436                                 updateLocal(bv, true);
 437                         }
 438                         break;
 439                 }
 440
 441                 case LFUN_INSERT_LABEL:
 442                 {
 443                         bv->lockedInsetStoreUndo(Undo::INSERT);
 444
 445                         MathCursor::row_type row = mathcursor->hullRow();
 446                         string old_label = hull()->label(row);
 447                         string new_label = arg;
 448
 449                         if (new_label.empty()) {
 450                                 string const default_label =
 451                                         (lyxrc.label_init_length >= 0) ? "eq:" : "";
 452                                 pair<bool, string> const res = old_label.empty()
 453                                         ? Alert::askForText(_("Enter new label to insert:"), default_label)
 454                                         : Alert::askForText(_("Enter label:"), old_label);
 455                                 if (!res.first)
 456                                         break;
 457                                 new_label = frontStrip(strip(res.second));
 458                         }
 459
 460                         //if (new_label == old_label)
 461                         //      break;  // Nothing to do
 462
 463                         if (!new_label.empty()) {
 464                                 lyxerr << "setting label to '" << new_label << "'\n";
 465                                 hull()->numbered(row, true);
 466                         }
 467
 468                         if (!new_label.empty() && bv->ChangeRefsIfUnique(old_label, new_label))
 469                                 bv->redraw();
 470
 471                         hull()->label(row, new_label);
 472
 473                         updateLocal(bv, true);
 474                         break;
 475                 }
 476
 477                 case LFUN_MATH_MUTATE:
 478                 {
 479                         bv->lockedInsetStoreUndo(Undo::EDIT);
 480                         int x;
 481                         int y;
 482                         mathcursor->getPos(x, y);
 483                         hull()->mutate(arg);
 484                         mathcursor->setPos(x, y);
 485                         mathcursor->normalize();
 486                         updateLocal(bv, true);
 487                         break;
 488                 }
 489
 490                 case LFUN_MATH_EXTERN:
 491                 {
 492                         bv->lockedInsetStoreUndo(Undo::EDIT);
 493                         handleExtern(arg);
 494                         // re-compute inset dimension
 495                         metrics(bv);
 496                         updateLocal(bv, true);
 497                         break;
 498                 }
 499
 500                 case LFUN_MATH_DISPLAY:
 501                 {
 502                         int x = 0;
 503                         int y = 0;
 504                         mathcursor->getPos(x, y);
 505                         if (hull()->getType() == LM_OT_SIMPLE)
 506                                 hull()->mutate(LM_OT_EQUATION);
 507                         else
 508                                 hull()->mutate(LM_OT_SIMPLE);
 509                         mathcursor->setPos(x, y);
 510                         mathcursor->normalize();
 511                         updateLocal(bv, true);
 512                         break;
 513                 }
 514
 515                 case LFUN_PASTESELECTION:
 516                 {
 517                         string const clip = bv->getClipboard();
 518                 if (!clip.empty())
 519                                 mathed_parse_normal(par_, clip);
 520                         break;
 521                 }
 522
 523                 default:
 524                         result = InsetFormulaBase::localDispatch(bv, action, arg);
 525         }
 526
 527         return result;
 528 }
 529
 530
 531 void InsetFormula::handleExtern(const string & arg)
 532 {
 533         // where are we?
 534         if (!mathcursor)
 535                 return;
 536
 537         string lang;
 538         string extra;
 539         istringstream iss(arg.c_str());
 540         iss >> lang >> extra;
 541         if (extra.empty())
 542                 extra = "noextra";
 543
 544         bool selected = mathcursor->selection();
 545
 546         MathArray ar;
 547         if (selected) {
 548                 mathcursor->selGet(ar);
 549                 //lyxerr << "use selection: " << ar << "\n";
 550         } else {
 551                 mathcursor->last();
 552                 mathcursor->stripFromLastEqualSign();
 553                 ar = mathcursor->cursor().cell();
 554                 mathcursor->insert('=');
 555                 //lyxerr << "use whole cell: " << ar << "\n";
 556         }
 557
 558         mathcursor->insert(pipeThroughExtern(lang, extra, ar));
 559 }
 560
 561
 562 bool InsetFormula::display() const
 563 {
 564         return hull()->getType() != LM_OT_SIMPLE;
 565 }
 566
 567
 568 MathHullInset const * InsetFormula::hull() const
 569 {
 570         lyx::Assert(par_->asHullInset());
 571         return par_->asHullInset();
 572 }
 573
 574
 575 MathHullInset * InsetFormula::hull()
 576 {
 577         lyx::Assert(par_->asHullInset());
 578         return par_->asHullInset();
 579 }
 580
 581
 582 Inset::Code InsetFormula::lyxCode() const
 583 {
 584         return Inset::MATH_CODE;
 585 }
 586
 587
 588 void InsetFormula::validate(LaTeXFeatures & features) const
 589 {
 590         par_->validate(features);
 591 }
 592
 593
 594 bool InsetFormula::insetAllowed(Inset::Code code) const
 595 {
 596         return
 597                 (code == Inset::LABEL_CODE && display())
 598                 || code == Inset::ERT_CODE;
 599 }
 600
 601
 602 int InsetFormula::ascent(BufferView *, LyXFont const &) const
 603 {
 604         return par_->ascent() + 1;
 605 }
 606
 607
 608 int InsetFormula::descent(BufferView *, LyXFont const &) const
 609 {
 610         return par_->descent() + 1;
 611 }
 612
 613
 614 int InsetFormula::width(BufferView * bv, LyXFont const & font) const
 615 {
 616         metrics(bv, font);
 617         return par_->width();
 618 }
 619
 620
 621 MathInsetTypes InsetFormula::getType() const
 622 {
 623         return hull()->getType();
 624 }