Usermode/Libraries/libspiderscript.so_src/exec_ast.c

   1 /*
   2  */
   3 #include <stdlib.h>
   4 #include <stdio.h>
   5 #include <string.h>
   6 #include "ast.h"
   7
   8 // === PROTOTYPES ===
   9 void    Object_Dereference(tSpiderValue *Object);
  10 void    Object_Reference(tSpiderValue *Object);
  11 tSpiderValue    *SpiderScript_CreateInteger(uint64_t Value);
  12 tSpiderValue    *SpiderScript_CreateReal(double Value);
  13 tSpiderValue    *SpiderScript_CreateString(int Length, const char *Data);
  14 tSpiderValue    *SpiderScript_CastValueTo(int Type, tSpiderValue *Source);
  15  int    SpiderScript_IsValueTrue(tSpiderValue *Value);
  16 char    *SpiderScript_DumpValue(tSpiderValue *Value);
  17
  18 tSpiderValue    *AST_ExecuteNode(tAST_BlockState *Block, tAST_Node *Node);
  19
  20 tAST_Variable *Variable_Define(tAST_BlockState *Block, int Type, const char *Name);
  21  int    Variable_SetValue(tAST_BlockState *Block, const char *Name, tSpiderValue *Value);
  22 tSpiderValue    *Variable_GetValue(tAST_BlockState *Block, const char *Name);
  23 void    Variable_Destroy(tAST_Variable *Variable);
  24
  25 // === CODE ===
  26 /**
  27  * \brief Dereference a created object
  28  */
  29 void Object_Dereference(tSpiderValue *Object)
  30 {
  31         if(!Object)     return ;
  32         if(Object == ERRPTR)    return ;
  33         Object->ReferenceCount --;
  34         if( Object->ReferenceCount == 0 ) {
  35                 switch( (enum eSpiderScript_DataTypes) Object->Type )
  36                 {
  37                 case SS_DATATYPE_OBJECT:
  38                         Object->Object->Type->Destructor( Object->Object );
  39                         break;
  40                 case SS_DATATYPE_OPAQUE:
  41                         Object->Opaque.Destroy( Object->Opaque.Data );
  42                         break;
  43                 default:
  44                         break;
  45                 }
  46                 free(Object);
  47         }
  48 }
  49
  50 void Object_Reference(tSpiderValue *Object)
  51 {
  52         if(!Object)     return ;
  53         Object->ReferenceCount ++;
  54 }
  55
  56 /**
  57  * \brief Create an integer object
  58  */
  59 tSpiderValue *SpiderScript_CreateInteger(uint64_t Value)
  60 {
  61         tSpiderValue    *ret = malloc( sizeof(tSpiderValue) );
  62         ret->Type = SS_DATATYPE_INTEGER;
  63         ret->ReferenceCount = 1;
  64         ret->Integer = Value;
  65         return ret;
  66 }
  67
  68 /**
  69  * \brief Create an real number object
  70  */
  71 tSpiderValue *SpiderScript_CreateReal(double Value)
  72 {
  73         tSpiderValue    *ret = malloc( sizeof(tSpiderValue) );
  74         ret->Type = SS_DATATYPE_REAL;
  75         ret->ReferenceCount = 1;
  76         ret->Real = Value;
  77         return ret;
  78 }
  79
  80 /**
  81  * \brief Create an string object
  82  */
  83 tSpiderValue *SpiderScript_CreateString(int Length, const char *Data)
  84 {
  85         tSpiderValue    *ret = malloc( sizeof(tSpiderValue) + Length + 1 );
  86         ret->Type = SS_DATATYPE_STRING;
  87         ret->ReferenceCount = 1;
  88         ret->String.Length = Length;
  89         memcpy(ret->String.Data, Data, Length);
  90         ret->String.Data[Length] = '\0';
  91         return ret;
  92 }
  93
  94 /**
  95  * \brief Concatenate two strings
  96  */
  97 tSpiderValue *Object_StringConcat(tSpiderValue *Str1, tSpiderValue *Str2)
  98 {
  99          int    newLen = 0;
 100         tSpiderValue    *ret;
 101         if(Str1)        newLen += Str1->String.Length;
 102         if(Str2)        newLen += Str2->String.Length;
 103         ret = malloc( sizeof(tSpiderValue) + newLen + 1 );
 104         ret->Type = SS_DATATYPE_STRING;
 105         ret->ReferenceCount = 1;
 106         ret->String.Length = newLen;
 107         if(Str1)
 108                 memcpy(ret->String.Data, Str1->String.Data, Str1->String.Length);
 109         if(Str2) {
 110                 if(Str1)
 111                         memcpy(ret->String.Data+Str1->String.Length, Str2->String.Data, Str2->String.Length);
 112                 else
 113                         memcpy(ret->String.Data, Str2->String.Data, Str2->String.Length);
 114         }
 115         ret->String.Data[ newLen ] = '\0';
 116         return ret;
 117 }
 118
 119 /**
 120  * \brief Cast one object to another
 121  * \brief Type  Destination type
 122  * \brief Source        Input data
 123  */
 124 tSpiderValue *SpiderScript_CastValueTo(int Type, tSpiderValue *Source)
 125 {
 126         tSpiderValue    *ret = ERRPTR;
 127          int    len = 0;
 128
 129         if( !Source )   return NULL;
 130
 131         // Check if anything needs to be done
 132         if( Source->Type == Type ) {
 133                 Object_Reference(Source);
 134                 return Source;
 135         }
 136
 137         switch( (enum eSpiderScript_DataTypes)Type )
 138         {
 139         case SS_DATATYPE_UNDEF:
 140         case SS_DATATYPE_ARRAY:
 141         case SS_DATATYPE_OPAQUE:
 142                 fprintf(stderr, "SpiderScript_CastValueTo - Invalid cast to %i\n", Type);
 143                 return ERRPTR;
 144
 145         case SS_DATATYPE_INTEGER:
 146                 ret = malloc(sizeof(tSpiderValue));
 147                 ret->Type = SS_DATATYPE_INTEGER;
 148                 ret->ReferenceCount = 1;
 149                 switch(Source->Type)
 150                 {
 151                 case SS_DATATYPE_INTEGER:       break;  // Handled above
 152                 case SS_DATATYPE_STRING:        ret->Integer = atoi(Source->String.Data);       break;
 153                 case SS_DATATYPE_REAL:  ret->Integer = Source->Real;    break;
 154                 default:
 155                         fprintf(stderr, "SpiderScript_CastValueTo - Invalid cast from %i\n", Source->Type);
 156                         free(ret);
 157                         ret = ERRPTR;
 158                         break;
 159                 }
 160                 break;
 161
 162         case SS_DATATYPE_STRING:
 163                 switch(Source->Type)
 164                 {
 165                 case SS_DATATYPE_INTEGER:       len = snprintf(NULL, 0, "%li", Source->Integer);        break;
 166                 case SS_DATATYPE_REAL:  snprintf(NULL, 0, "%f", Source->Real);  break;
 167                 default:        break;
 168                 }
 169                 ret = malloc(sizeof(tSpiderValue) + len + 1);
 170                 ret->Type = SS_DATATYPE_STRING;
 171                 ret->ReferenceCount = 1;
 172                 ret->String.Length = len;
 173                 switch(Source->Type)
 174                 {
 175                 case SS_DATATYPE_INTEGER:       sprintf(ret->String.Data, "%li", Source->Integer);      break;
 176                 case SS_DATATYPE_REAL:  sprintf(ret->String.Data, "%f", Source->Real);  break;
 177                 default:
 178                         fprintf(stderr, "SpiderScript_CastValueTo - Invalid cast from %i\n", Source->Type);
 179                         free(ret);
 180                         ret = ERRPTR;
 181                         break;
 182                 }
 183                 break;
 184
 185         default:
 186                 fprintf(stderr, "BUG REPORT: Unimplemented cast target\n");
 187                 break;
 188         }
 189
 190         return ret;
 191 }
 192
 193 /**
 194  * \brief Condenses a value down to a boolean
 195  */
 196 int SpiderScript_IsValueTrue(tSpiderValue *Value)
 197 {
 198         if( Value == ERRPTR )   return 0;
 199         if( Value == NULL )     return 0;
 200
 201         switch( (enum eSpiderScript_DataTypes)Value->Type )
 202         {
 203         case SS_DATATYPE_UNDEF:
 204                 return 0;
 205
 206         case SS_DATATYPE_INTEGER:
 207                 return !!Value->Integer;
 208
 209         case SS_DATATYPE_REAL:
 210                 return (-.5f < Value->Real && Value->Real < 0.5f);
 211
 212         case SS_DATATYPE_STRING:
 213                 return Value->String.Length > 0;
 214
 215         case SS_DATATYPE_OBJECT:
 216                 return Value->Object != NULL;
 217
 218         case SS_DATATYPE_OPAQUE:
 219                 return Value->Opaque.Data != NULL;
 220
 221         case SS_DATATYPE_ARRAY:
 222                 return Value->Array.Length > 0;
 223         default:
 224                 fprintf(stderr, "Spiderscript internal error: Unknown type %i in SpiderScript_IsValueTrue\n", Value->Type);
 225                 return 0;
 226         }
 227         return 0;
 228 }
 229
 230 /**
 231  * \brief Dump a value into a string
 232  * \return Heap string
 233  */
 234 char *SpiderScript_DumpValue(tSpiderValue *Value)
 235 {
 236         char    *ret;
 237         if( Value == ERRPTR )
 238                 return strdup("ERRPTR");
 239         if( Value == NULL )
 240                 return strdup("null");
 241
 242         switch( (enum eSpiderScript_DataTypes)Value->Type )
 243         {
 244         case SS_DATATYPE_UNDEF: return strdup("undefined");
 245
 246         case SS_DATATYPE_INTEGER:
 247                 ret = malloc( sizeof(Value->Integer)*2 + 3 );
 248                 sprintf(ret, "0x%lx", Value->Integer);
 249                 return ret;
 250
 251         case SS_DATATYPE_REAL:
 252                 ret = malloc( sprintf(NULL, "%f", Value->Real) + 1 );
 253                 sprintf(ret, "%f", Value->Real);
 254                 return ret;
 255
 256         case SS_DATATYPE_STRING:
 257                 ret = malloc( Value->String.Length + 3 );
 258                 ret[0] = '"';
 259                 strcpy(ret+1, Value->String.Data);
 260                 ret[Value->String.Length+1] = '"';
 261                 ret[Value->String.Length+2] = '\0';
 262                 return ret;
 263
 264         case SS_DATATYPE_OBJECT:
 265                 ret = malloc( sprintf(NULL, "{%s *%p}", Value->Object->Type->Name, Value->Object) + 1 );
 266                 sprintf(ret, "{%s *%p}", Value->Object->Type->Name, Value->Object);
 267                 return ret;
 268
 269         case SS_DATATYPE_OPAQUE:
 270                 ret = malloc( sprintf(NULL, "*%p", Value->Opaque.Data) + 1 );
 271                 sprintf(ret, "*%p", Value->Opaque.Data);
 272                 return ret;
 273
 274         case SS_DATATYPE_ARRAY:
 275                 return strdup("Array");
 276
 277         default:
 278                 fprintf(stderr, "Spiderscript internal error: Unknown type %i in Object_Dump\n", Value->Type);
 279                 return NULL;
 280         }
 281
 282 }
 283
 284 /**
 285  * \brief Execute an AST node and return its value
 286  */
 287 tSpiderValue *AST_ExecuteNode(tAST_BlockState *Block, tAST_Node *Node)
 288 {
 289         tAST_Node       *node;
 290         tSpiderValue    *ret = NULL, *tmpobj;
 291         tSpiderValue    *op1, *op2;     // Binary operations
 292          int    cmp;    // Used in comparisons
 293
 294         switch(Node->Type)
 295         {
 296         // No Operation
 297         case NODETYPE_NOP:      ret = NULL;     break;
 298
 299         // Code block
 300         case NODETYPE_BLOCK:
 301                 {
 302                         tAST_BlockState blockInfo;
 303                         blockInfo.FirstVar = NULL;
 304                         blockInfo.RetVal = NULL;
 305                         blockInfo.Parent = Block;
 306                         blockInfo.Script = Block->Script;
 307                         ret = NULL;
 308                         for(node = Node->Block.FirstChild; node && !blockInfo.RetVal; node = node->NextSibling )
 309                         {
 310                                 tmpobj = AST_ExecuteNode(&blockInfo, node);
 311                                 if(tmpobj == ERRPTR) {  // Error check
 312                                         ret = ERRPTR;
 313                                         break ;
 314                                 }
 315                                 if(tmpobj)      Object_Dereference(tmpobj);     // Free unused value
 316                         }
 317                         // Clean up variables
 318                         while(blockInfo.FirstVar)
 319                         {
 320                                 tAST_Variable   *nextVar = blockInfo.FirstVar->Next;
 321                                 Variable_Destroy( blockInfo.FirstVar );
 322                                 blockInfo.FirstVar = nextVar;
 323                         }
 324
 325                         if( blockInfo.RetVal )
 326                                 Block->RetVal = blockInfo.RetVal;
 327                 }
 328
 329                 break;
 330
 331         // Assignment
 332         case NODETYPE_ASSIGN:
 333                 if( Node->Assign.Dest->Type != NODETYPE_VARIABLE ) {
 334                         fprintf(stderr, "Syntax error: LVALUE of assignment is not a variable\n");
 335                         return ERRPTR;
 336                 }
 337                 ret = AST_ExecuteNode(Block, Node->Assign.Value);
 338                 if(ret != ERRPTR)
 339                 {
 340                         if( Variable_SetValue( Block, Node->Assign.Dest->Variable.Name, ret ) ) {
 341                                 Object_Dereference( ret );
 342                                 fprintf(stderr, "on line %i\n", Node->Line);
 343                                 return ERRPTR;
 344                         }
 345                 }
 346                 break;
 347
 348         // Function Call
 349         case NODETYPE_FUNCTIONCALL:
 350                 {
 351                          int    nParams = 0;
 352                         for(node = Node->FunctionCall.FirstArg; node; node = node->NextSibling) {
 353                                 nParams ++;
 354                         }
 355                         // Logical block (used to allocate `params`)
 356                         {
 357                                 tSpiderValue    *params[nParams];
 358                                  int    i=0;
 359                                 for(node = Node->FunctionCall.FirstArg; node; node = node->NextSibling) {
 360                                         params[i] = AST_ExecuteNode(Block, node);
 361                                         if( params[i] == ERRPTR ) {
 362                                                 while(i--)      Object_Dereference(params[i]);
 363                                                 ret = ERRPTR;
 364                                                 goto _return;
 365                                         }
 366                                         i ++;
 367                                 }
 368
 369                                 // Call the function (SpiderScript_ExecuteMethod does the
 370                                 // required namespace handling)
 371                                 ret = SpiderScript_ExecuteMethod(Block->Script, Node->FunctionCall.Name, nParams, params);
 372
 373                                 // Dereference parameters
 374                                 while(i--)      Object_Dereference(params[i]);
 375
 376                                 // falls out
 377                         }
 378                 }
 379                 break;
 380
 381         // Conditional
 382         case NODETYPE_IF:
 383                 ret = AST_ExecuteNode(Block, Node->If.Condition);
 384                 if( SpiderScript_IsValueTrue(ret) ) {
 385                         AST_ExecuteNode(Block, Node->If.True);
 386                 }
 387                 else {
 388                         AST_ExecuteNode(Block, Node->If.False);
 389                 }
 390                 Object_Dereference(ret);
 391                 break;
 392
 393         // Loop
 394         case NODETYPE_LOOP:
 395                 ret = AST_ExecuteNode(Block, Node->For.Init);
 396                 if( Node->For.bCheckAfter ) {
 397                         do {
 398                                 Object_Dereference(ret);
 399                                 ret = AST_ExecuteNode(Block, Node->For.Code);
 400                                 Object_Dereference(ret);
 401                                 ret = AST_ExecuteNode(Block, Node->For.Condition);
 402                         } while( SpiderScript_IsValueTrue(ret) );
 403                 }
 404                 else {
 405                         Object_Dereference(ret);
 406                         ret = AST_ExecuteNode(Block, Node->For.Condition);
 407                         while( SpiderScript_IsValueTrue(ret) ) {
 408                                 Object_Dereference(ret);
 409                                 ret = AST_ExecuteNode(Block, Node->For.Code);
 410                                 Object_Dereference(ret);
 411                                 ret = AST_ExecuteNode(Block, Node->For.Condition);
 412                         }
 413                         Object_Dereference(ret);
 414                 }
 415                 break;
 416
 417         // Return
 418         case NODETYPE_RETURN:
 419                 ret = AST_ExecuteNode(Block, Node->UniOp.Value);
 420                 Block->RetVal = ret;    // Return value set
 421                 break;
 422
 423         // Define a variable
 424         case NODETYPE_DEFVAR:
 425                 ret = NULL;
 426                 if( Variable_Define(Block, Node->DefVar.DataType, Node->DefVar.Name) == ERRPTR )
 427                         ret = ERRPTR;
 428                 break;
 429
 430         // Variable
 431         case NODETYPE_VARIABLE:
 432                 ret = Variable_GetValue( Block, Node->Variable.Name );
 433                 break;
 434
 435         // Cast a value to another
 436         case NODETYPE_CAST:
 437                 ret = SpiderScript_CastValueTo(
 438                         Node->Cast.DataType,
 439                         AST_ExecuteNode(Block, Node->Cast.Value)
 440                         );
 441                 break;
 442
 443         // Index into an array
 444         case NODETYPE_INDEX:
 445                 fprintf(stderr, "TODO: Array indexing\n");
 446                 ret = ERRPTR;
 447                 break;
 448
 449         // TODO: Implement runtime constants
 450         case NODETYPE_CONSTANT:
 451                 fprintf(stderr, "TODO: Runtime Constants\n");
 452                 ret = ERRPTR;
 453                 break;
 454         // Constant Values
 455         case NODETYPE_STRING:   ret = SpiderScript_CreateString( Node->String.Length, Node->String.Data );      break;
 456         case NODETYPE_INTEGER:  ret = SpiderScript_CreateInteger( Node->Integer );      break;
 457         case NODETYPE_REAL:     ret = SpiderScript_CreateReal( Node->Real );    break;
 458
 459         // --- Operations ---
 460         // Boolean Operations
 461         case NODETYPE_LOGICALAND:       // Logical AND (&&)
 462         case NODETYPE_LOGICALOR:        // Logical OR (||)
 463         case NODETYPE_LOGICALXOR:       // Logical XOR (^^)
 464                 op1 = AST_ExecuteNode(Block, Node->BinOp.Left);
 465                 if(op1 == ERRPTR)       return ERRPTR;
 466                 op2 = AST_ExecuteNode(Block, Node->BinOp.Right);
 467                 if(op2 == ERRPTR) {
 468                         Object_Dereference(op1);
 469                         return ERRPTR;
 470                 }
 471
 472                 switch( Node->Type )
 473                 {
 474                 case NODETYPE_LOGICALAND:
 475                         ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) && SpiderScript_IsValueTrue(op2) );
 476                         break;
 477                 case NODETYPE_LOGICALOR:
 478                         ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) || SpiderScript_IsValueTrue(op2) );
 479                         break;
 480                 case NODETYPE_LOGICALXOR:
 481                         ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) ^ SpiderScript_IsValueTrue(op2) );
 482                         break;
 483                 default:        break;
 484                 }
 485
 486                 // Free intermediate objects
 487                 Object_Dereference(op1);
 488                 Object_Dereference(op2);
 489                 break;
 490
 491         // Comparisons
 492         case NODETYPE_EQUALS:
 493         case NODETYPE_LESSTHAN:
 494         case NODETYPE_GREATERTHAN:
 495                 op1 = AST_ExecuteNode(Block, Node->BinOp.Left);
 496                 if(op1 == ERRPTR)       return ERRPTR;
 497                 op2 = AST_ExecuteNode(Block, Node->BinOp.Right);
 498                 if(op2 == ERRPTR) {
 499                         Object_Dereference(op1);
 500                         return ERRPTR;
 501                 }
 502
 503                 // Convert types
 504                 if( op1->Type != op2->Type ) {
 505                         // If dynamically typed, convert op2 to op1's type
 506                         if(Block->Script->Variant->bDyamicTyped)
 507                         {
 508                                 tmpobj = op2;
 509                                 op2 = SpiderScript_CastValueTo(op1->Type, op2);
 510                                 Object_Dereference(tmpobj);
 511                                 if(op2 == ERRPTR) {
 512                                         Object_Dereference(op1);
 513                                         return ERRPTR;
 514                                 }
 515                         }
 516                         // If statically typed, this should never happen, but catch it anyway
 517                         else {
 518                                 fprintf(stderr, "PARSER ERROR: Statically typed implicit cast (line %i)\n",
 519                                         Node->Line);
 520                                 ret = ERRPTR;
 521                                 break;
 522                         }
 523                 }
 524                 // Do operation
 525                 switch(op1->Type)
 526                 {
 527                 // - String Compare (does a strcmp, well memcmp)
 528                 case SS_DATATYPE_STRING:
 529                         // Call memcmp to do most of the work
 530                         cmp = memcmp(
 531                                 op1->String.Data, op2->String.Data,
 532                                 (op1->String.Length < op2->String.Length) ? op1->String.Length : op2->String.Length
 533                                 );
 534                         // Handle reaching the end of the string
 535                         if( cmp == 0 ) {
 536                                 if( op1->String.Length == op2->String.Length )
 537                                         cmp = 0;
 538                                 else if( op1->String.Length < op2->String.Length )
 539                                         cmp = 1;
 540                                 else
 541                                         cmp = -1;
 542                         }
 543                         break;
 544                 default:
 545                         fprintf(stderr, "SpiderScript internal error: TODO: Comparison of type %i\n", op1->Type);
 546                         ret = ERRPTR;
 547                         break;
 548                 }
 549
 550                 // Free intermediate objects
 551                 Object_Dereference(op1);
 552                 Object_Dereference(op2);
 553
 554                 // Error check
 555                 if( ret == ERRPTR )
 556                         break;
 557
 558                 // Create return
 559                 switch(Node->Type)
 560                 {
 561                 case NODETYPE_EQUALS:   ret = SpiderScript_CreateInteger(cmp == 0);     break;
 562                 case NODETYPE_LESSTHAN: ret = SpiderScript_CreateInteger(cmp < 0);      break;
 563                 case NODETYPE_GREATERTHAN:      ret = SpiderScript_CreateInteger(cmp > 0);      break;
 564                 default:
 565                         fprintf(stderr, "SpiderScript internal error: Exec,CmpOp unknown op %i", Node->Type);
 566                         ret = ERRPTR;
 567                         break;
 568                 }
 569                 break;
 570
 571         // General Binary Operations
 572         case NODETYPE_ADD:
 573         case NODETYPE_SUBTRACT:
 574         case NODETYPE_MULTIPLY:
 575         case NODETYPE_DIVIDE:
 576         case NODETYPE_MODULO:
 577         case NODETYPE_BWAND:
 578         case NODETYPE_BWOR:
 579         case NODETYPE_BWXOR:
 580         case NODETYPE_BITSHIFTLEFT:
 581         case NODETYPE_BITSHIFTRIGHT:
 582         case NODETYPE_BITROTATELEFT:
 583                 // Get operands
 584                 op1 = AST_ExecuteNode(Block, Node->BinOp.Left);
 585                 if(op1 == ERRPTR)       return ERRPTR;
 586                 op2 = AST_ExecuteNode(Block, Node->BinOp.Right);
 587                 if(op2 == ERRPTR) {
 588                         Object_Dereference(op1);
 589                         return ERRPTR;
 590                 }
 591
 592                 // Convert types
 593                 if( op1 && op2 && op1->Type != op2->Type ) {
 594                         // If dynamically typed, convert op2 to op1's type
 595                         if(Block->Script->Variant->bDyamicTyped)
 596                         {
 597                                 tmpobj = op2;
 598                                 op2 = SpiderScript_CastValueTo(op1->Type, op2);
 599                                 Object_Dereference(tmpobj);
 600                                 if(op2 == ERRPTR) {
 601                                         Object_Dereference(op1);
 602                                         return ERRPTR;
 603                                 }
 604                         }
 605                         // If statically typed, this should never happen, but catch it anyway
 606                         else {
 607                                 fprintf(stderr,
 608                                         "PARSER ERROR: Statically typed implicit cast (from %i to %i)\n",
 609                                         op2->Type, op1->Type
 610                                         );
 611                                 ret = ERRPTR;
 612                                 break;
 613                         }
 614                 }
 615
 616                 // NULL Check
 617                 if( op1 == NULL || op2 == NULL ) {
 618                         ret = NULL;
 619                         break;
 620                 }
 621
 622                 // Do operation
 623                 switch(op1->Type)
 624                 {
 625                 // String Concatenation
 626                 case SS_DATATYPE_STRING:
 627                         switch(Node->Type)
 628                         {
 629                         case NODETYPE_ADD:      // Concatenate
 630                                 ret = Object_StringConcat(op1, op2);
 631                                 break;
 632                         default:
 633                                 fprintf(stderr, "SpiderScript internal error: Exec,BinOP,String unknown op %i\n", Node->Type);
 634                                 ret = ERRPTR;
 635                                 break;
 636                         }
 637                         break;
 638                 // Integer Operations
 639                 case SS_DATATYPE_INTEGER:
 640                         switch(Node->Type)
 641                         {
 642                         case NODETYPE_ADD:      ret = SpiderScript_CreateInteger( op1->Integer + op2->Integer );        break;
 643                         case NODETYPE_SUBTRACT: ret = SpiderScript_CreateInteger( op1->Integer - op2->Integer );        break;
 644                         case NODETYPE_MULTIPLY: ret = SpiderScript_CreateInteger( op1->Integer * op2->Integer );        break;
 645                         case NODETYPE_DIVIDE:   ret = SpiderScript_CreateInteger( op1->Integer / op2->Integer );        break;
 646                         case NODETYPE_MODULO:   ret = SpiderScript_CreateInteger( op1->Integer % op2->Integer );        break;
 647                         case NODETYPE_BWAND:    ret = SpiderScript_CreateInteger( op1->Integer & op2->Integer );        break;
 648                         case NODETYPE_BWOR:     ret = SpiderScript_CreateInteger( op1->Integer | op2->Integer );        break;
 649                         case NODETYPE_BWXOR:    ret = SpiderScript_CreateInteger( op1->Integer ^ op2->Integer );        break;
 650                         case NODETYPE_BITSHIFTLEFT:     ret = SpiderScript_CreateInteger( op1->Integer << op2->Integer );       break;
 651                         case NODETYPE_BITSHIFTRIGHT:ret = SpiderScript_CreateInteger( op1->Integer >> op2->Integer );   break;
 652                         case NODETYPE_BITROTATELEFT:
 653                                 ret = SpiderScript_CreateInteger( (op1->Integer << op2->Integer) | (op1->Integer >> (64-op2->Integer)) );
 654                                 break;
 655                         default:
 656                                 fprintf(stderr, "SpiderScript internal error: Exec,BinOP,Integer unknown op %i\n", Node->Type);
 657                                 ret = ERRPTR;
 658                                 break;
 659                         }
 660                         break;
 661
 662                 // Real Numbers
 663                 case SS_DATATYPE_REAL:
 664                         switch(Node->Type)
 665                         {
 666                         default:
 667                                 fprintf(stderr, "SpiderScript internal error: Exec,BinOP,Real unknown op %i\n", Node->Type);
 668                                 ret = ERRPTR;
 669                                 break;
 670                         }
 671                         break;
 672
 673                 default:
 674                         fprintf(stderr, "SpiderScript error: Invalid operation (%i) on type (%i)\n", Node->Type, op1->Type);
 675                         ret = ERRPTR;
 676                         break;
 677                 }
 678
 679                 // Free intermediate objects
 680                 Object_Dereference(op1);
 681                 Object_Dereference(op2);
 682                 break;
 683
 684         //default:
 685         //      ret = NULL;
 686         //      fprintf(stderr, "ERROR: SpiderScript AST_ExecuteNode Unimplemented %i\n", Node->Type);
 687         //      break;
 688         }
 689 _return:
 690         return ret;
 691 }
 692
 693 /**
 694  * \brief Define a variable
 695  * \param Block Current block state
 696  * \param Type  Type of the variable
 697  * \param Name  Name of the variable
 698  * \return Boolean Failure
 699  */
 700 tAST_Variable *Variable_Define(tAST_BlockState *Block, int Type, const char *Name)
 701 {
 702         tAST_Variable   *var, *prev = NULL;
 703
 704         for( var = Block->FirstVar; var; prev = var, var = var->Next )
 705         {
 706                 if( strcmp(var->Name, Name) == 0 ) {
 707                         fprintf(stderr, "ERROR: Redefinition of variable '%s'\n", Name);
 708                         return ERRPTR;
 709                 }
 710         }
 711
 712         var = malloc( sizeof(tAST_Variable) + strlen(Name) + 1 );
 713         var->Next = NULL;
 714         var->Type = Type;
 715         var->Object = NULL;
 716         strcpy(var->Name, Name);
 717
 718         if(prev)        prev->Next = var;
 719         else    Block->FirstVar = var;
 720
 721         //printf("Defined variable %s (%i)\n", Name, Type);
 722
 723         return var;
 724 }
 725
 726 /**
 727  * \brief Set the value of a variable
 728  * \return Boolean Failure
 729  */
 730 int Variable_SetValue(tAST_BlockState *Block, const char *Name, tSpiderValue *Value)
 731 {
 732         tAST_Variable   *var;
 733         tAST_BlockState *bs;
 734
 735         for( bs = Block; bs; bs = bs->Parent )
 736         {
 737                 for( var = bs->FirstVar; var; var = var->Next )
 738                 {
 739                         if( strcmp(var->Name, Name) == 0 ) {
 740                                 if( !Block->Script->Variant->bDyamicTyped
 741                                  && (Value && var->Type != Value->Type) ) {
 742                                         fprintf(stderr, "ERROR: Type mismatch assigning to '%s'\n", Name);
 743                                         return -2;
 744                                 }
 745                                 Object_Reference(Value);
 746                                 Object_Dereference(var->Object);
 747                                 var->Object = Value;
 748                                 return 0;
 749                         }
 750                 }
 751         }
 752
 753         if( Block->Script->Variant->bDyamicTyped )
 754         {
 755                 // Define variable
 756                 var = Variable_Define(Block, Value->Type, Name);
 757                 Object_Reference(Value);
 758                 var->Object = Value;
 759                 return 0;
 760         }
 761         else
 762         {
 763                 fprintf(stderr, "ERROR: Variable '%s' set while undefined\n", Name);
 764                 return -1;
 765         }
 766 }
 767
 768 /**
 769  * \brief Get the value of a variable
 770  */
 771 tSpiderValue *Variable_GetValue(tAST_BlockState *Block, const char *Name)
 772 {
 773         tAST_Variable   *var;
 774         tAST_BlockState *bs;
 775
 776         for( bs = Block; bs; bs = bs->Parent )
 777         {
 778                 for( var = bs->FirstVar; var; var = var->Next )
 779                 {
 780                         if( strcmp(var->Name, Name) == 0 ) {
 781                                 Object_Reference(var->Object);
 782                                 return var->Object;
 783                         }
 784                 }
 785         }
 786
 787         fprintf(stderr, "ERROR: Variable '%s' used undefined\n", Name);
 788
 789         return ERRPTR;
 790 }
 791
 792 /**
 793  * \brief Destorys a variable
 794  */
 795 void Variable_Destroy(tAST_Variable *Variable)
 796 {
 797         Object_Dereference(Variable->Object);
 798         free(Variable);
 799 }