contrib/src/deprecated/wxexpr.cpp

   1 /////////////////////////////////////////////////////////////////////////////
   2 // Name:        wxexpr.cpp
   3 // Purpose:     wxExpr
   4 // Author:      Julian Smart
   5 // Modified by:
   6 // Created:     04/01/98
   7 // RCS-ID:      $Id$
   8 // Copyright:   (c) Julian Smart
   9 // Licence:     wxWindows licence
  10 /////////////////////////////////////////////////////////////////////////////
  11
  12 #ifdef __GNUG__
  13 #pragma implementation "wxexpr.h"
  14 #endif
  15
  16 // For compilers that support precompilation, includes "wx/wx.h".
  17 #include "wx/wxprec.h"
  18
  19 #ifdef __BORLANDC__
  20 #pragma hdrstop
  21 #endif
  22
  23 #include "wx/deprecated/setup.h"
  24
  25 #if wxUSE_PROLOGIO
  26
  27 #include <stdarg.h>
  28 #include <ctype.h>
  29 #include <string.h>
  30
  31 #include "wx/utils.h"
  32 #include "wx/deprecated/expr.h"
  33 #include "wx/deprecated/wxexpr.h"
  34
  35 extern "C" void add_expr(char *);
  36 extern "C" void LexFromFile(FILE *fd);
  37 extern "C" void LexFromString(char *buf);
  38
  39
  40
  41 /* Rename all YACC/LEX stuff or we'll conflict with other
  42  * applications
  43  */
  44
  45 #define yyback PROIO_yyback
  46 #define yylook PROIO_yylook
  47 #define yywrap PROIO_yywrap
  48 #define yyoutput PROIO_yyoutput
  49 #define yylex PROIO_yylex
  50 #define yyerror PROIO_yyerror
  51 #define yyleng PROIO_yyleng
  52 #define yytext PROIO_yytext
  53 #define yymorfg PROIO_yymorfg
  54 #define yylineno PROIO_yylineno
  55 #define yytchar PROIO_yytchar
  56 #define yyin PROIO_yyin
  57 #define yyout PROIO_yyout
  58 #define yysvf PROIO_yysvf
  59 #define yyestate PROIO_yyestate
  60 #define yysvec PROIO_yysvec
  61 #define yybgin PROIO_yybgin
  62 #define yyprevious PROIO_yyprevious
  63 #define yylhs PROIO_yylhs
  64 #define yylen PROIO_yylen
  65 #define yydefred PROIO_yydefred
  66 #define yydgoto PROIO_yydgoto
  67 #define yysindex PROIO_yysindex
  68 #define yyrindex PROIO_yyrindex
  69 #define yygindex PROIO_yygindex
  70 #define yytable PROIO_yytable
  71 #define yycheck PROIO_yycheck
  72 #define yyname PROIO_yyname
  73 #define yyrule PROIO_yyrule
  74 #define yydebug PROIO_yydebug
  75 #define yynerrs PROIO_yynerrs
  76 #define yyerrflag PROIO_yyerrflag
  77 #define yychar PROIO_yychar
  78 #define yyvsp PROIO_yyvsp
  79 #define yyssp PROIO_yyssp
  80 #define yyval PROIO_yyval
  81 #define yylval PROIO_yylval
  82 #define yyss PROIO_yyss
  83 #define yyvs PROIO_yyvs
  84 #define yyparse PROIO_yyparse
  85
  86 /* +++steve162e: more defines necessary */
  87 #define yy_init_buffer PROIO_yy_init_buffer
  88 #define yy_create_buffer PROIO_yy_create_buffer
  89 #define yy_load_buffer_state PROIO_yy_load_buffer_state
  90 #define yyrestart PROIO_yyrestart
  91 #define yy_switch_to_buffer PROIO_yy_switch_to_buffer
  92 #define yy_delete_buffer PROIO_yy_delete_buffer
  93 /* ---steve162e */
  94
  95 /* WG 1/96: still more for flex 2.5 */
  96 #define yy_scan_buffer PROIO_scan_buffer
  97 #define yy_scan_string PROIO_scan_string
  98 #define yy_scan_bytes PROIO_scan_bytes
  99 #define yy_flex_debug PROIO_flex_debug
 100 #define yy_flush_buffer PROIO_flush_buffer
 101 #if !defined(__VISAGECPP__)
 102 /* multiply defined??? */
 103 #define yyleng PROIO_yyleng
 104 #define yytext PROIO_yytext
 105 #endif
 106
 107 extern "C" WXDLLEXPORT_DATA(FILE*) yyin;
 108 extern "C" WXDLLEXPORT int yyparse(void);
 109
 110
 111 wxExprDatabase *thewxExprDatabase = NULL;
 112 wxExprErrorHandler currentwxExprErrorHandler;
 113
 114 wxExpr::wxExpr(const wxString& functor)
 115 {
 116   type = wxExprList;
 117   next = NULL;
 118   last = NULL;
 119   value.first = NULL;
 120
 121   wxExpr *pfunctor = new wxExpr(wxExprWord, functor);
 122   Append(pfunctor);
 123   client_data = NULL;
 124 }
 125
 126 wxExpr::wxExpr(wxExprType the_type, const wxString& word_or_string)
 127 {
 128   type = the_type;
 129
 130   switch (the_type)
 131   {
 132    case wxExprWord:
 133     value.word = copystring((const wxChar *)word_or_string);
 134     break;
 135    case wxExprString:
 136     value.string = copystring((const wxChar *)word_or_string);
 137     break;
 138    case wxExprList:
 139     last = NULL;
 140     value.first = NULL;
 141     break;
 142    case wxExprReal:
 143    case wxExprInteger:
 144    case wxExprNull:
 145     break;
 146   }
 147   client_data = NULL;
 148   next = NULL;
 149 }
 150
 151 wxExpr::wxExpr(wxExprType the_type, wxChar *word_or_string, bool allocate)
 152 {
 153   type = the_type;
 154
 155   switch (the_type)
 156   {
 157    case wxExprWord:
 158     value.word = allocate ? copystring(word_or_string) : word_or_string;
 159     break;
 160    case wxExprString:
 161     value.string = allocate ? copystring(word_or_string) : word_or_string;
 162     break;
 163    case wxExprList:
 164     last = NULL;
 165     value.first = NULL;
 166     break;
 167    case wxExprReal:
 168    case wxExprInteger:
 169    case wxExprNull:
 170     break;
 171   }
 172   client_data = NULL;
 173   next = NULL;
 174 }
 175
 176 wxExpr::wxExpr(long the_integer)
 177 {
 178   type = wxExprInteger;
 179   value.integer = the_integer;
 180   client_data = NULL;
 181   next = NULL;
 182 }
 183
 184 wxExpr::wxExpr(double the_real)
 185 {
 186   type = wxExprReal;
 187   value.real = the_real;
 188   client_data = NULL;
 189   next = NULL;
 190 }
 191
 192 wxExpr::wxExpr(wxList *the_list)
 193 {
 194   type = wxExprList;
 195   client_data = NULL;
 196   last = NULL;
 197   value.first = NULL;
 198
 199   wxExpr *listExpr = new wxExpr(wxExprList);
 200
 201   wxNode *node = the_list->GetFirst();
 202   while (node)
 203   {
 204     wxExpr *expr = (wxExpr *)node->GetData();
 205     listExpr->Append(expr);
 206     node = node->GetNext();
 207   }
 208   Append(listExpr);
 209
 210   delete the_list;
 211 }
 212
 213 wxExpr::~wxExpr(void)
 214 {
 215   switch (type)
 216   {
 217     case wxExprInteger:
 218     case wxExprReal:
 219     {
 220      break;
 221     }
 222    case wxExprString:
 223    {
 224      delete[] value.string;
 225      break;
 226    }
 227    case wxExprWord:
 228    {
 229      delete[] value.word;
 230      break;
 231    }
 232    case wxExprList:
 233    {
 234      wxExpr *expr = value.first;
 235      while (expr)
 236      {
 237        wxExpr *expr1 = expr->next;
 238
 239        delete expr;
 240        expr = expr1;
 241      }
 242      break;
 243    }
 244    case wxExprNull: break;
 245   }
 246 }
 247
 248 void wxExpr::Append(wxExpr *expr)
 249 {
 250   if (!value.first)
 251     value.first = expr;
 252
 253   if (last)
 254     last->next = expr;
 255   last = expr;
 256 }
 257
 258 void wxExpr::Insert(wxExpr *expr)
 259 {
 260   expr->next = value.first;
 261   value.first = expr;
 262
 263   if (!last)
 264     last = expr;
 265 }
 266
 267 wxExpr *wxExpr::Copy(void) const
 268 {
 269   // This seems to get round an optimizer bug when
 270   // using Watcom C++ 10a in WIN32 compilation mode.
 271   // If these lines not present, the type seems to be
 272   // interpreted wrongly as an integer.
 273   // I don't want to turn optimization off since it's needed
 274   // for reading in files quickly.
 275 #if defined(__WATCOMC__)
 276   char buf[2];
 277   sprintf(buf, "");
 278 #endif
 279
 280   switch (type)
 281   {
 282     case wxExprInteger:
 283       return new wxExpr(value.integer);
 284     case wxExprReal:
 285       return new wxExpr(value.real);
 286     case wxExprString:
 287       return new wxExpr(wxExprString, wxString(value.string));
 288     case wxExprWord:
 289       return new wxExpr(wxExprWord, wxString(value.word));
 290     case wxExprList:
 291     {
 292       wxExpr *expr = value.first;
 293       wxExpr *new_list = new wxExpr(wxExprList);
 294       while (expr)
 295       {
 296         wxExpr *expr2 = expr->Copy();
 297         new_list->Append(expr2);
 298         expr = expr->next;
 299       }
 300       return new_list;
 301     }
 302    case wxExprNull:
 303     break;
 304   }
 305   return NULL;
 306 }
 307
 308
 309 // Get the wxExpr (containing (= wxExpr Value) form) for the given word
 310 //  or string, assuming that we have Attribute=Value, ...
 311 wxExpr *wxExpr::GetAttributeValueNode(const wxString& word) const // Use only for a clause or list
 312 {
 313   if (type != wxExprList)
 314     return NULL;
 315
 316   wxExpr *expr = value.first;
 317   while (expr)
 318   {
 319     if (expr->type == wxExprList)
 320     {
 321       wxExpr *firstNode = expr->value.first;
 322       if ((firstNode->type == wxExprWord) && (firstNode->value.word[0] == '='))
 323       {
 324         wxExpr *secondNode = firstNode->next;
 325         if ((secondNode->type == wxExprWord) &&
 326             (wxStrcmp((const wxChar *)word, secondNode->value.word) == 0))
 327         {
 328           return expr;
 329         }
 330       }
 331     }
 332     expr = expr->next;
 333   }
 334   return NULL;
 335 }
 336
 337 // Get the value (in wxExpr form) for the given word or string, assuming
 338 // that we have Attribute=Value, ...
 339 wxExpr *wxExpr::AttributeValue(const wxString& word) const // Use only for a clause or list
 340 {
 341   if (type != wxExprList)
 342     return NULL;
 343
 344   wxExpr *attExpr = GetAttributeValueNode(word);
 345   if (attExpr && attExpr->value.first && attExpr->value.first->next)
 346     return attExpr->value.first->next->next;
 347   else return NULL;
 348 }
 349
 350 wxString wxExpr::Functor(void) const // Use only for a clause
 351 {
 352   if ((type != wxExprList) || !value.first)
 353     return wxString(wxT(""));
 354
 355   if (value.first->type == wxExprWord)
 356     return wxString(value.first->value.word);
 357   else
 358     return wxString(wxT(""));
 359 }
 360
 361 bool wxExpr::IsFunctor(const wxString& f) const  // Use only for a clause
 362 {
 363   if ((type != wxExprList) || !value.first)
 364     return FALSE;
 365
 366   return (value.first->type == wxExprWord &&
 367           (wxStrcmp((const wxChar *)f, value.first->value.word) == 0));
 368 }
 369
 370 // Return nth argument of a clause (starting from 1)
 371 wxExpr *wxExpr::Arg(wxExprType theType, int arg) const
 372 {
 373   wxExpr *expr = value.first;
 374   int i;
 375   for (i = 1; i < arg; i++)
 376     if (expr)
 377       expr = expr->next;
 378
 379   if (expr && (expr->type == theType))
 380     return expr;
 381   else
 382     return NULL;
 383 }
 384
 385 // Return nth argument of a list expression (starting from zero)
 386 wxExpr *wxExpr::Nth(int arg) const
 387 {
 388   if (type != wxExprList)
 389     return NULL;
 390
 391   wxExpr *expr = value.first;
 392   int i;
 393   for (i = 0; i < arg; i++)
 394     if (expr)
 395       expr = expr->next;
 396     else return NULL;
 397
 398   if (expr)
 399     return expr;
 400   else
 401     return NULL;
 402 }
 403
 404   // Returns the number of elements in a list expression
 405 int wxExpr::Number(void) const
 406 {
 407   if (type != wxExprList)
 408     return 0;
 409
 410   int i = 0;
 411   wxExpr *expr = value.first;
 412   while (expr)
 413   {
 414     expr = expr->next;
 415     i ++;
 416   }
 417   return i;
 418 }
 419
 420 void wxExpr::DeleteAttributeValue(const wxString& attribute)
 421 {
 422   if (type != wxExprList)
 423     return;
 424
 425   wxExpr *expr = value.first;
 426   wxExpr *lastExpr = this;
 427   while (expr)
 428   {
 429     if (expr->type == wxExprList)
 430     {
 431       wxExpr *firstNode = expr->value.first;
 432       if ((firstNode->type == wxExprWord) && (firstNode->value.word[0] == '='))
 433       {
 434         wxExpr *secondNode = firstNode->next;
 435         if ((secondNode->type == wxExprWord) &&
 436             (wxStrcmp((const wxChar *)attribute, secondNode->value.word) == 0))
 437         {
 438           wxExpr *nextExpr = expr->next;
 439           delete expr;
 440
 441           lastExpr->next = nextExpr;
 442
 443           if (last == expr)
 444             last = lastExpr;
 445
 446           return;
 447         }
 448       }
 449     }
 450     lastExpr = expr;
 451     expr = expr->next;
 452   }
 453   return;
 454 }
 455
 456 void wxExpr::AddAttributeValue(const wxString& attribute, wxExpr *val)
 457 {
 458   if (type != wxExprList)
 459   {
 460 //    cout << "Error! tried to add an attribute-value pair to a nonlist wxExpr expression\n";
 461     return;
 462   }
 463   // Warning - existing code may assume that any existing value
 464   // is deleted first. For efficiency, we leave this to the application.
 465 //  DeleteAttributeValue(attribute);
 466
 467   wxExpr *patt = new wxExpr(wxExprWord, attribute);
 468   wxExpr *pequals = new wxExpr(wxExprWord, wxT("="));
 469
 470   wxExpr *listExpr = new wxExpr(wxExprList);
 471
 472   listExpr->Append(pequals);
 473   listExpr->Append(patt);
 474   listExpr->Append(val);
 475
 476   Append(listExpr);
 477 }
 478
 479 void wxExpr::AddAttributeValue(const wxString& attribute, long val)
 480 {
 481   if (type != wxExprList)
 482   {
 483 //    cout << "Error! tried to add an attribute-value pair to a nonlist wxExpr expression\n";
 484     return;
 485   }
 486   // Warning - existing code may assume that any existing value
 487   // is deleted first. For efficiency, we leave this to the application.
 488 //  DeleteAttributeValue(attribute);
 489
 490   wxExpr *patt = new wxExpr(wxExprWord, attribute);
 491   wxExpr *pval = new wxExpr(val);
 492   wxExpr *pequals = new wxExpr(wxExprWord, wxT("="));
 493
 494   wxExpr *listExpr = new wxExpr(wxExprList);
 495
 496   listExpr->Append(pequals);
 497   listExpr->Append(patt);
 498   listExpr->Append(pval);
 499
 500   Append(listExpr);
 501 }
 502
 503 void wxExpr::AddAttributeValue(const wxString& attribute, double val)
 504 {
 505   if (type != wxExprList)
 506   {
 507 //    cout << "Error! tried to add an attribute-value pair to a nonlist wxExpr expression\n";
 508     return;
 509   }
 510
 511 //  DeleteAttributeValue(attribute);
 512   wxExpr *patt = new wxExpr(wxExprWord, attribute);
 513   wxExpr *pval = new wxExpr(val);
 514   wxExpr *pequals = new wxExpr(wxExprWord, wxT("="));
 515
 516   wxExpr *listExpr = new wxExpr(wxExprList);
 517
 518   listExpr->Append(pequals);
 519   listExpr->Append(patt);
 520   listExpr->Append(pval);
 521
 522   Append(listExpr);
 523 }
 524
 525 void wxExpr::AddAttributeValueString(const wxString& attribute, const wxString& val)
 526 {
 527   if (type != wxExprList)
 528   {
 529 //    cout << "Error! tried to add an attribute-value pair to a nonlist wxExpr expression\n";
 530     return;
 531   }
 532
 533 //  DeleteAttributeValue(attribute);
 534
 535   wxExpr *patt = new wxExpr(wxExprWord, attribute);
 536   wxExpr *pval = new wxExpr(wxExprString, val);
 537   wxExpr *pequals = new wxExpr(wxExprWord, wxT("="));
 538
 539   wxExpr *listExpr = new wxExpr(wxExprList);
 540
 541   listExpr->Append(pequals);
 542   listExpr->Append(patt);
 543   listExpr->Append(pval);
 544
 545   Append(listExpr);
 546 }
 547
 548 void wxExpr::AddAttributeValueWord(const wxString& attribute, const wxString& val)
 549 {
 550   if (type != wxExprList)
 551   {
 552 //    cout << "Error! tried to add an attribute-value pair to a nonlist wxExpr expression\n";
 553     return;
 554   }
 555
 556 //  DeleteAttributeValue(attribute);
 557
 558   wxExpr *patt = new wxExpr(wxExprWord, attribute);
 559   wxExpr *pval = new wxExpr(wxExprWord, val);
 560   wxExpr *pequals = new wxExpr(wxExprWord, wxT("="));
 561
 562   wxExpr *listExpr = new wxExpr(wxExprList);
 563
 564   listExpr->Append(pequals);
 565   listExpr->Append(patt);
 566   listExpr->Append(pval);
 567
 568   Append(listExpr);
 569 }
 570
 571 void wxExpr::AddAttributeValue(const wxString& attribute, wxList *val)
 572 {
 573   if (type != wxExprList)
 574   {
 575 //    cout << "Error! tried to add an attribute-value pair to a nonlist wxExpr expression\n";
 576     return;
 577   }
 578   if (!val)
 579     return;
 580
 581 //  DeleteAttributeValue(attribute);
 582
 583   wxExpr *patt = new wxExpr(wxExprWord, attribute);
 584   wxExpr *pval = new wxExpr(val);
 585   wxExpr *pequals = new wxExpr(wxExprWord, wxT("="));
 586
 587   wxExpr *listExpr = new wxExpr(wxExprList);
 588
 589   listExpr->Append(pequals);
 590   listExpr->Append(patt);
 591   listExpr->Append(pval);
 592
 593   Append(listExpr);
 594 }
 595
 596 void wxExpr::AddAttributeValueStringList(const wxString& attribute, wxList *string_list)
 597 {
 598   if (type != wxExprList)
 599   {
 600 //    cout << "Error! tried to add an attribute-value pair to a nonlist wxExpr expression\n";
 601     return;
 602   }
 603   if (!string_list)
 604     return;
 605
 606 //  DeleteAttributeValue(attribute);
 607
 608   // First make a list of wxExpr strings
 609   wxExpr *listExpr = new wxExpr(wxExprList);
 610   wxNode *node = string_list->GetFirst();
 611   while (node)
 612   {
 613     wxChar *string = (wxChar*)node->GetData();
 614     wxExpr *expr = new wxExpr(wxExprString, wxString(string));
 615     listExpr->Append(expr);
 616     node = node->GetNext();
 617   }
 618
 619   // Now make an (=, Att, Value) triple
 620   wxExpr *patt = new wxExpr(wxExprWord, attribute);
 621   wxExpr *pequals = new wxExpr(wxExprWord, wxT("="));
 622
 623   wxExpr *listExpr2 = new wxExpr(wxExprList);
 624
 625   listExpr2->Append(pequals);
 626   listExpr2->Append(patt);
 627   listExpr2->Append(listExpr);
 628
 629   Append(listExpr2);
 630 }
 631
 632 bool wxExpr::GetAttributeValue(const wxString& att, int& var) const
 633 {
 634   wxExpr *expr = AttributeValue(att);
 635
 636   if (expr && (expr->Type() == wxExprInteger || expr->Type() == wxExprReal))
 637   {
 638     var = (int)(expr->IntegerValue());
 639     return TRUE;
 640   }
 641   else
 642     return FALSE;
 643 }
 644
 645 bool wxExpr::GetAttributeValue(const wxString& att, long& var) const
 646 {
 647   wxExpr *expr = AttributeValue(att);
 648
 649   if (expr && (expr->Type() == wxExprInteger || expr->Type() == wxExprReal))
 650   {
 651     var = expr->IntegerValue();
 652     return TRUE;
 653   }
 654   else
 655     return FALSE;
 656 }
 657
 658 bool wxExpr::GetAttributeValue(const wxString& att, float& var) const
 659 {
 660   wxExpr *expr = AttributeValue(att);
 661   if (expr && (expr->Type() == wxExprInteger || expr->Type() == wxExprReal))
 662   {
 663     var = (float) expr->RealValue();
 664     return TRUE;
 665   }
 666   else
 667     return FALSE;
 668 }
 669
 670 bool wxExpr::GetAttributeValue(const wxString& att, double& var) const
 671 {
 672   wxExpr *expr = AttributeValue(att);
 673   if (expr && (expr->Type() == wxExprInteger || expr->Type() == wxExprReal))
 674   {
 675     var = expr->RealValue();
 676     return TRUE;
 677   }
 678   else
 679     return FALSE;
 680 }
 681
 682 bool wxExpr::GetAttributeValue(const wxString& att, wxString& var)  const // Word OR string -> string
 683 {
 684   wxExpr *expr = AttributeValue(att);
 685   if (expr && expr->Type() == wxExprWord)
 686   {
 687     var = expr->WordValue();
 688     return TRUE;
 689   }
 690   else if (expr && expr->Type() == wxExprString)
 691   {
 692     var = expr->StringValue();
 693     return TRUE;
 694   }
 695   else
 696     return FALSE;
 697 }
 698
 699 bool wxExpr::GetAttributeValue(const wxString& att, wxExpr **var) const
 700 {
 701   wxExpr *expr = AttributeValue(att);
 702   if (expr)
 703   {
 704     *var = expr;
 705     return TRUE;
 706   }
 707   else
 708     return FALSE;
 709 }
 710
 711 bool wxExpr::GetAttributeValueStringList(const wxString& att, wxList *var) const
 712 {
 713   wxExpr *expr = AttributeValue(att);
 714   if (expr && expr->Type() == wxExprList)
 715   {
 716     wxExpr *string_expr = expr->value.first;
 717     while (string_expr)
 718     {
 719       if (string_expr->Type() == wxExprString)
 720         var->Append((wxObject *)copystring(string_expr->StringValue()));
 721
 722       string_expr = string_expr->next;
 723     }
 724         return TRUE;
 725   }
 726   else
 727     return FALSE;
 728 }
 729
 730 // Compatibility
 731 void wxExpr::AssignAttributeValue(wxChar *att, wxChar **var) const
 732 {
 733   wxString str;
 734   if (GetAttributeValue(att, str))
 735   {
 736     if (*var)
 737       delete[] *var;
 738     *var = copystring((const wxChar *) str);
 739   }
 740 }
 741
 742 void wxExpr::WriteClause(FILE* stream)  // Write this expression as a top-level clause
 743 {
 744   if (type != wxExprList)
 745     return;
 746
 747   wxExpr *node = value.first;
 748   if (node)
 749   {
 750     node->WriteExpr(stream);
 751     fprintf( stream, "(" );
 752     node = node->next;
 753     bool first = TRUE;
 754     while (node)
 755     {
 756       if (!first)
 757         fprintf( stream, "  " );
 758       node->WriteExpr(stream);
 759       node = node->next;
 760       if (node)
 761         fprintf( stream, ",\n" );
 762       first = FALSE;
 763     }
 764     fprintf( stream, ").\n\n" );
 765   }
 766 }
 767
 768 void wxExpr::WriteExpr(FILE* stream)    // Write as any other subexpression
 769 {
 770   // This seems to get round an optimizer bug when
 771   // using Watcom C++ 10a in WIN32 compilation mode.
 772   // If these lines not present, the type seems to be
 773   // interpreted wrongly as an integer.
 774   // I don't want to turn optimization off since it's needed
 775   // for reading in files quickly.
 776 #if defined(__WATCOMC__)
 777   char buf[2];
 778   sprintf(buf, "");
 779 #endif
 780
 781   switch (type)
 782   {
 783     case wxExprInteger:
 784     {
 785       fprintf( stream, "%ld", value.integer );
 786       break;
 787     }
 788     case wxExprReal:
 789     {
 790       double f = value.real;
 791       fprintf( stream, "%.6g", f);
 792       break;
 793     }
 794     case wxExprString:
 795     {
 796       fprintf( stream, "\"" );
 797       size_t i;
 798       const wxWX2MBbuf val = wxConvLibc.cWX2MB(value.string);
 799       size_t len = strlen(val);
 800       for (i = 0; i < len; i++)
 801       {
 802         char ch = val[i];
 803         if (ch == '"' || ch == '\\')
 804         fprintf( stream, "\\" );
 805         char tmp[2];
 806         tmp[0] = ch;
 807         tmp[1] = 0;
 808         fprintf( stream, tmp );
 809       }
 810       fprintf( stream, "\"" );
 811       break;
 812     }
 813     case wxExprWord:
 814     {
 815       bool quote_it = FALSE;
 816       const wxWX2MBbuf val = wxConvLibc.cWX2MB(value.word);
 817       size_t len = strlen(val);
 818       if ((len == 0) || (len > 0 && (val[(size_t) 0] > 64 && val[(size_t) 0] < 91)))
 819         quote_it = TRUE;
 820       else
 821       {
 822         size_t i;
 823         for (i = 0; i < len; i++)
 824           if ((!isalpha(val[i])) && (!isdigit(val[i])) &&
 825               (val[i] != '_'))
 826             { quote_it = TRUE; i = len; }
 827       }
 828
 829       if (quote_it)
 830         fprintf( stream ,"'" );
 831
 832       fprintf( stream, val );
 833
 834       if (quote_it)
 835         fprintf( stream, "'" );
 836
 837       break;
 838     }
 839     case wxExprList:
 840     {
 841       if (!value.first)
 842         fprintf( stream, "[]" );
 843       else
 844       {
 845         wxExpr *expr = value.first;
 846
 847         if ((expr->Type() == wxExprWord) && (wxStrcmp(expr->WordValue(), wxT("=")) == 0))
 848         {
 849           wxExpr *arg1 = expr->next;
 850           wxExpr *arg2 = arg1->next;
 851           arg1->WriteExpr(stream);
 852           fprintf( stream, " = " );
 853           arg2->WriteExpr(stream);
 854         }
 855         else
 856         {
 857           fprintf( stream, "[" );
 858           while (expr)
 859           {
 860             expr->WriteExpr(stream);
 861             expr = expr->next;
 862             if (expr)
 863                 fprintf( stream, ", " );
 864           }
 865           fprintf( stream, "]" );
 866         }
 867       }
 868       break;
 869     }
 870    case wxExprNull: break;
 871   }
 872 }
 873
 874 /*
 875  * wxExpr 'database' (list of expressions)
 876  */
 877
 878 IMPLEMENT_DYNAMIC_CLASS(wxExprDatabase, wxList)
 879
 880 wxExprDatabase::wxExprDatabase(wxExprErrorHandler handler)
 881 {
 882   position = NULL;
 883   hash_table = NULL;
 884   currentwxExprErrorHandler = handler;
 885   noErrors = 0;
 886 }
 887
 888 wxExprDatabase::wxExprDatabase(wxExprType type, const wxString& attribute, int size,
 889                                wxExprErrorHandler handler)
 890 {
 891   position = NULL;
 892   attribute_to_hash = attribute;
 893   if (type == wxExprString)
 894     hash_table = new wxHashTable(wxKEY_STRING, size);
 895   else if (type == wxExprInteger)
 896     hash_table = new wxHashTable(wxKEY_INTEGER, size);
 897   else hash_table = NULL;
 898
 899   currentwxExprErrorHandler = handler;
 900   noErrors = 0;
 901 }
 902
 903 wxExprDatabase::~wxExprDatabase(void)
 904 {
 905   ClearDatabase();
 906   if (hash_table)
 907     delete hash_table;
 908 }
 909
 910 void wxExprDatabase::BeginFind(void)          // Initialise a search
 911 {
 912   position = GetFirst();
 913 }
 914
 915 wxExpr *wxExprDatabase::FindClause(long id)  // Find a term based on an integer id attribute
 916                                  // e.g. node(id=23, type=rectangle, ....).
 917 {
 918   wxExpr *found = NULL;
 919   while (position && !found)
 920   {
 921     wxExpr *term = (wxExpr *)position->GetData();
 922
 923     if (term->Type() == wxExprList)
 924     {
 925       wxExpr *value = term->AttributeValue(wxT("id"));
 926       if (value->Type() == wxExprInteger && value->IntegerValue() == id)
 927         found = term;
 928     }
 929     position = position->GetNext();
 930   }
 931   return found;
 932 }
 933
 934 // Find on basis of attribute/value pairs, e.g. type=rectangle
 935 wxExpr *wxExprDatabase::FindClause(const wxString& word, const wxString& val)
 936 {
 937   wxExpr *found = NULL;
 938   while (position && !found)
 939   {
 940     wxExpr *term = (wxExpr *)position->GetData();
 941
 942     if (term->Type() == wxExprList)
 943     {
 944       wxExpr *value = term->AttributeValue(word);
 945       if ((value->Type() == wxExprWord && value->WordValue() == val) ||
 946           (value->Type() == wxExprString && value->StringValue() == val))
 947         found = term;
 948     }
 949     position = position->GetNext();
 950   }
 951   return found;
 952 }
 953
 954 wxExpr *wxExprDatabase::FindClause(const wxString& word, long val)
 955 {
 956   wxExpr *found = NULL;
 957   while (position && !found)
 958   {
 959     wxExpr *term = (wxExpr *)position->GetData();
 960
 961     if (term->Type() == wxExprList)
 962     {
 963       wxExpr *value = term->AttributeValue(word);
 964       if ((value->Type() == wxExprInteger) && (value->IntegerValue() == val))
 965         found = term;
 966     }
 967     position = position->GetNext();
 968   }
 969   return found;
 970 }
 971
 972 wxExpr *wxExprDatabase::FindClause(const wxString& word, double val)
 973 {
 974   wxExpr *found = NULL;
 975   while (position && !found)
 976   {
 977     wxExpr *term = (wxExpr *)position->GetData();
 978
 979     if (term->Type() == wxExprList)
 980     {
 981       wxExpr *value = term->AttributeValue(word);
 982       if ((value->Type() == wxExprReal) && (value->RealValue() == val))
 983         found = term;
 984     }
 985     position = position->GetNext();
 986   }
 987   return found;
 988 }
 989
 990 wxExpr *wxExprDatabase::FindClauseByFunctor(const wxString& functor)
 991 {
 992   wxExpr *found = NULL;
 993   while (position && !found)
 994   {
 995     wxExpr *term = (wxExpr *)position->GetData();
 996
 997     if (term->Type() == wxExprList)
 998     {
 999       if (term->Functor() == functor)
1000         found = term;
1001     }
1002     position = position->GetNext();
1003   }
1004   return found;
1005 }
1006
1007 // If hashing is on, must store in hash table too
1008 void wxExprDatabase::Append(wxExpr *clause)
1009 {
1010   wxList::Append((wxObject *)clause);
1011   if (hash_table)
1012   {
1013     wxString functor(clause->Functor());
1014     wxExpr *expr = clause->AttributeValue(attribute_to_hash);
1015     if (expr)
1016     {
1017       long functor_key = hash_table->MakeKey(WXSTRINGCAST functor);
1018       long value_key = 0;
1019       if (expr && expr->Type() == wxExprString)
1020       {
1021         value_key = hash_table->MakeKey(WXSTRINGCAST expr->StringValue());
1022         hash_table->Put(functor_key + value_key, WXSTRINGCAST expr->StringValue(), (wxObject *)clause);
1023       }
1024       else if (expr && expr->Type() == wxExprInteger)
1025       {
1026         value_key = expr->IntegerValue();
1027         hash_table->Put(functor_key + value_key, expr->IntegerValue(), (wxObject *)clause);
1028       }
1029
1030     }
1031   }
1032 }
1033
1034 wxExpr *wxExprDatabase::HashFind(const wxString& functor, long value) const
1035 {
1036   long key = hash_table->MakeKey(WXSTRINGCAST functor) + value;
1037
1038   // The key alone isn't guaranteed to be unique:
1039   // must supply value too. Let's assume the value of the
1040   // id is going to be reasonably unique.
1041   return (wxExpr *)hash_table->Get(key, value);
1042 }
1043
1044 wxExpr *wxExprDatabase::HashFind(const wxString& functor, const wxString& value) const
1045 {
1046   long key = hash_table->MakeKey(WXSTRINGCAST functor) + hash_table->MakeKey(WXSTRINGCAST value);
1047   return (wxExpr *)hash_table->Get(key, WXSTRINGCAST value);
1048 }
1049
1050 void wxExprDatabase::ClearDatabase(void)
1051 {
1052   noErrors = 0;
1053   wxNode *node = GetFirst();
1054   while (node)
1055   {
1056     wxExpr *expr = (wxExpr *)node->GetData();
1057     delete expr;
1058     delete node;
1059     node = GetFirst();
1060   }
1061
1062   if (hash_table)
1063     hash_table->Clear();
1064 }
1065
1066 bool wxExprDatabase::Read(const wxString& filename)
1067 {
1068   noErrors = 0;
1069
1070   FILE *f = wxFopen(filename, _T("r"));
1071   if (f)
1072   {
1073     thewxExprDatabase = this;
1074
1075     LexFromFile(f);
1076     yyparse();
1077     fclose(f);
1078
1079     wxExprCleanUp();
1080     return (noErrors == 0);
1081   }
1082   else
1083   {
1084     return FALSE;
1085   }
1086 }
1087
1088 bool wxExprDatabase::ReadFromString(const wxString& buffer)
1089 {
1090   noErrors = 0;
1091   thewxExprDatabase = this;
1092
1093   const wxWX2MBbuf buf = buffer.mb_str();
1094   LexFromString(wxMBSTRINGCAST buf);
1095   yyparse();
1096   wxExprCleanUp();
1097   return (noErrors == 0);
1098 }
1099
1100 bool wxExprDatabase::Write(const wxString& fileName)
1101 {
1102   FILE *stream = wxFopen( fileName, _T("w+"));
1103
1104   if (!stream)
1105     return FALSE;
1106
1107   bool success = Write(stream);
1108   fclose(stream);
1109   return success;
1110 }
1111
1112 bool wxExprDatabase::Write(FILE *stream)
1113 {
1114   noErrors = 0;
1115   wxNode *node = GetFirst();
1116   while (node)
1117   {
1118     wxExpr *expr = (wxExpr *)node->GetData();
1119     expr->WriteClause(stream);
1120     node = node->GetNext();
1121   }
1122   return (noErrors == 0);
1123 }
1124
1125 void add_expr(wxExpr * expr)
1126 {
1127   thewxExprDatabase->Append(expr);
1128 }
1129
1130 // Checks functor
1131 bool wxExprIsFunctor(wxExpr *expr, const wxString& functor)
1132 {
1133   if (expr && (expr->Type() == wxExprList))
1134   {
1135     wxExpr *first_expr = expr->value.first;
1136
1137     if (first_expr && (first_expr->Type() == wxExprWord) &&
1138        (first_expr->WordValue() == functor))
1139       return TRUE;
1140     else
1141       return FALSE;
1142   }
1143   else
1144     return FALSE;
1145 }
1146
1147 /*
1148  * Called from parser
1149  *
1150  */
1151
1152 char *wxmake_integer(char *str)
1153 {
1154   wxExpr *x = new wxExpr(atol(str));
1155
1156   return (char *)x;
1157 }
1158
1159 char *wxmake_real(char *str1, char *str2)
1160 {
1161   char buf[50];
1162
1163   sprintf(buf, "%s.%s", str1, str2);
1164   double f = (double)atof(buf);
1165   wxExpr *x = new wxExpr(f);
1166
1167   return (char *)x;
1168 }
1169
1170 // extern "C" double exp10(double);
1171
1172 char *wxmake_exp(char *str1, char *str2)
1173 {
1174   double mantissa = (double)atoi(str1);
1175   double exponent = (double)atoi(str2);
1176
1177   double d = mantissa * pow(10.0, exponent);
1178
1179   wxExpr *x = new wxExpr(d);
1180
1181   return (char *)x;
1182 }
1183
1184 char *wxmake_exp2(char *str1, char *str2, char *str3)
1185 {
1186   char buf[50];
1187
1188   sprintf(buf, "%s.%s", str1, str2);
1189   double mantissa = (double)atof(buf);
1190   double exponent = (double)atoi(str3);
1191
1192   double d = mantissa * pow(10.0, exponent);
1193
1194   wxExpr *x = new wxExpr(d);
1195
1196   return (char *)x;
1197 }
1198
1199 char *wxmake_word(char *str)
1200 {
1201   wxExpr *x = new wxExpr(wxExprWord, wxString(str, wxConvLibc).c_str());
1202   return (char *)x;
1203 }
1204
1205 char *wxmake_string(char *str)
1206 {
1207   wxChar *s, *t;
1208   size_t len, i;
1209   const wxMB2WXbuf sbuf = wxConvLibc.cMB2WX(str);
1210
1211 //  str++;                      /* skip leading quote */
1212   len = wxStrlen(sbuf) - 1;     /* ignore trailing quote */
1213
1214   s = new wxChar[len + 1];
1215
1216   t = s;
1217   for(i=1; i<len; i++) // 1 since we want to skip leading quote
1218   {
1219     if (sbuf[i] == wxT('\\') && sbuf[i+1] == wxT('"'))
1220     {
1221       *t++ = wxT('"');
1222       i ++;
1223     }
1224     else if (sbuf[i] == wxT('\\') && sbuf[i+1] == wxT('\\'))
1225     {
1226       *t++ = wxT('\\');
1227       i ++;
1228     }
1229     else
1230       *t++ = sbuf[i];
1231   }
1232
1233   *t = wxT('\0');
1234
1235   wxExpr *x = new wxExpr(wxExprString, s, FALSE);
1236   return (char *)x;
1237 }
1238
1239 char *proio_cons(char * ccar, char * ccdr)
1240 {
1241   wxExpr *car = (wxExpr *)ccar;
1242   wxExpr *cdr = (wxExpr *)ccdr;
1243
1244   if (cdr == NULL)
1245   {
1246     cdr = new wxExpr(wxExprList);
1247   }
1248   if (car)
1249     cdr->Insert(car);
1250   return (char *)cdr;
1251 }
1252
1253 void process_command(char * cexpr)
1254 {
1255   wxExpr *expr = (wxExpr *)cexpr;
1256   add_expr(expr);
1257 }
1258
1259 void syntax_error(char *WXUNUSED(s))
1260 {
1261   if (currentwxExprErrorHandler)
1262     (void)(*(currentwxExprErrorHandler))(WXEXPR_ERROR_SYNTAX, (char *)"syntax error");
1263   if (thewxExprDatabase) thewxExprDatabase->noErrors += 1;
1264 }
1265
1266 #if 0
1267 #ifdef _WINDLL
1268 // char *__cdecl strdup(const char *s)
1269 WXDLLEXPORT char *strdup(const char *s)
1270 {
1271   int len = strlen(s);
1272   char *new_s = (char *)malloc(sizeof(char)*(len+1));
1273   strcpy(new_s, s);
1274   return new_s;
1275 }
1276 #endif
1277 #endif
1278
1279 #endif
1280   // wxUSE_PROLOGIO