9 #define TRACE_VAR_LOOKUPS 0
10 #define TRACE_NODE_RETURNS 0
13 extern tSpiderFunction *gpExports_First;
16 void Object_Dereference(tSpiderValue *Object);
17 void Object_Reference(tSpiderValue *Object);
18 tSpiderValue *SpiderScript_CreateInteger(uint64_t Value);
19 tSpiderValue *SpiderScript_CreateReal(double Value);
20 tSpiderValue *SpiderScript_CreateString(int Length, const char *Data);
21 tSpiderValue *SpiderScript_CastValueTo(int Type, tSpiderValue *Source);
22 int SpiderScript_IsValueTrue(tSpiderValue *Value);
23 void SpiderScript_FreeValue(tSpiderValue *Value);
24 char *SpiderScript_DumpValue(tSpiderValue *Value);
26 tSpiderValue *AST_ExecuteNode(tAST_BlockState *Block, tAST_Node *Node);
27 tSpiderValue *AST_ExecuteNode_BinOp(tAST_BlockState *Block, int Operation, tSpiderValue *Left, tSpiderValue *Right);
28 tSpiderValue *AST_ExecuteNode_UniOp(tAST_BlockState *Block, int Operation, tSpiderValue *Value);
30 tAST_Variable *Variable_Define(tAST_BlockState *Block, int Type, const char *Name, tSpiderValue *Value);
31 int Variable_SetValue(tAST_BlockState *Block, tAST_Node *VarNode, tSpiderValue *Value);
32 tSpiderValue *Variable_GetValue(tAST_BlockState *Block, tAST_Node *VarNode);
33 void Variable_Destroy(tAST_Variable *Variable);
35 void AST_RuntimeMessage(tAST_Node *Node, const char *Type, const char *Format, ...);
36 void AST_RuntimeError(tAST_Node *Node, const char *Format, ...);
39 int giNextBlockIdent = 1;
43 * \brief Dereference a created object
45 void Object_Dereference(tSpiderValue *Object)
48 if(Object == ERRPTR) return ;
49 Object->ReferenceCount --;
50 // printf("%p Dereferenced (%i)\n", Object, Object->ReferenceCount);
51 if( Object->ReferenceCount == 0 ) {
52 switch( (enum eSpiderScript_DataTypes) Object->Type )
54 case SS_DATATYPE_OBJECT:
55 Object->Object->Type->Destructor( Object->Object );
57 case SS_DATATYPE_OPAQUE:
58 Object->Opaque.Destroy( Object->Opaque.Data );
67 void Object_Reference(tSpiderValue *Object)
70 Object->ReferenceCount ++;
71 // printf("%p Referenced (%i)\n", Object, Object->ReferenceCount);
75 * \brief Allocate and initialise a SpiderScript object
77 tSpiderObject *SpiderScript_AllocateObject(tSpiderObjectDef *Class, int ExtraBytes)
79 int size = sizeof(tSpiderObject) + Class->NAttributes * sizeof(tSpiderValue*) + ExtraBytes;
80 tSpiderObject *ret = malloc(size);
83 ret->ReferenceCount = 1;
84 ret->OpaqueData = &ret->Attributes[ Class->NAttributes ];
85 memset( ret->Attributes, 0, Class->NAttributes * sizeof(tSpiderValue*) );
91 * \brief Create an integer object
93 tSpiderValue *SpiderScript_CreateInteger(uint64_t Value)
95 tSpiderValue *ret = malloc( sizeof(tSpiderValue) );
96 ret->Type = SS_DATATYPE_INTEGER;
97 ret->ReferenceCount = 1;
103 * \brief Create an real number object
105 tSpiderValue *SpiderScript_CreateReal(double Value)
107 tSpiderValue *ret = malloc( sizeof(tSpiderValue) );
108 ret->Type = SS_DATATYPE_REAL;
109 ret->ReferenceCount = 1;
115 * \brief Create an string object
117 tSpiderValue *SpiderScript_CreateString(int Length, const char *Data)
119 tSpiderValue *ret = malloc( sizeof(tSpiderValue) + Length + 1 );
120 ret->Type = SS_DATATYPE_STRING;
121 ret->ReferenceCount = 1;
122 ret->String.Length = Length;
124 memcpy(ret->String.Data, Data, Length);
126 memset(ret->String.Data, 0, Length);
127 ret->String.Data[Length] = '\0';
132 * \brief Concatenate two strings
134 tSpiderValue *Object_StringConcat(const tSpiderValue *Str1, const tSpiderValue *Str2)
138 if(Str1) newLen += Str1->String.Length;
139 if(Str2) newLen += Str2->String.Length;
140 ret = malloc( sizeof(tSpiderValue) + newLen + 1 );
141 ret->Type = SS_DATATYPE_STRING;
142 ret->ReferenceCount = 1;
143 ret->String.Length = newLen;
145 memcpy(ret->String.Data, Str1->String.Data, Str1->String.Length);
148 memcpy(ret->String.Data+Str1->String.Length, Str2->String.Data, Str2->String.Length);
150 memcpy(ret->String.Data, Str2->String.Data, Str2->String.Length);
152 ret->String.Data[ newLen ] = '\0';
157 * \brief Cast one object to another
158 * \brief Type Destination type
159 * \brief Source Input data
161 tSpiderValue *SpiderScript_CastValueTo(int Type, tSpiderValue *Source)
163 tSpiderValue *ret = ERRPTR;
170 case SS_DATATYPE_INTEGER: return SpiderScript_CreateInteger(0);
171 case SS_DATATYPE_REAL: return SpiderScript_CreateReal(0);
172 case SS_DATATYPE_STRING: return SpiderScript_CreateString(4, "null");
177 // Check if anything needs to be done
178 if( Source->Type == Type ) {
179 Object_Reference(Source);
185 printf("Casting %i ", Source->Type);
188 case SS_DATATYPE_INTEGER: printf("0x%lx", Source->Integer); break;
189 case SS_DATATYPE_STRING: printf("\"%s\"", Source->String.Data); break;
190 case SS_DATATYPE_REAL: printf("%f", Source->Real); break;
193 printf(" to %i\n", Type);
198 if( Source->Type == SS_DATATYPE_OBJECT )
200 const char *name = NULL;
203 case SS_DATATYPE_INTEGER: name = "cast Integer"; break;
204 case SS_DATATYPE_REAL: name = "cast Real"; break;
205 case SS_DATATYPE_STRING: name = "cast String"; break;
206 case SS_DATATYPE_ARRAY: name = "cast Array"; break;
208 AST_RuntimeError(NULL, "Invalid cast to %i from Object", Type);
213 ret = Object_ExecuteMethod(Left->Object, fcnname, Right);
216 // Fall through and try casting (which will usually fail)
221 switch( (enum eSpiderScript_DataTypes)Type )
223 case SS_DATATYPE_UNDEF:
224 case SS_DATATYPE_ARRAY:
225 case SS_DATATYPE_OPAQUE:
226 case SS_DATATYPE_OBJECT:
227 AST_RuntimeError(NULL, "Invalid cast to %i", Type);
230 case SS_DATATYPE_INTEGER:
231 ret = malloc(sizeof(tSpiderValue));
232 ret->Type = SS_DATATYPE_INTEGER;
233 ret->ReferenceCount = 1;
236 case SS_DATATYPE_INTEGER: break; // Handled above
237 case SS_DATATYPE_STRING: ret->Integer = atoi(Source->String.Data); break;
238 case SS_DATATYPE_REAL: ret->Integer = Source->Real; break;
240 AST_RuntimeError(NULL, "Invalid cast from %i to Integer", Source->Type);
247 case SS_DATATYPE_REAL:
248 ret = malloc(sizeof(tSpiderValue));
249 ret->Type = SS_DATATYPE_REAL;
250 ret->ReferenceCount = 1;
253 case SS_DATATYPE_STRING: ret->Real = atof(Source->String.Data); break;
254 case SS_DATATYPE_INTEGER: ret->Real = Source->Integer; break;
256 AST_RuntimeError(NULL, "Invalid cast from %i to Real", Source->Type);
263 case SS_DATATYPE_STRING:
266 case SS_DATATYPE_INTEGER: len = snprintf(NULL, 0, "%li", Source->Integer); break;
267 case SS_DATATYPE_REAL: len = snprintf(NULL, 0, "%g", Source->Real); break;
270 ret = malloc(sizeof(tSpiderValue) + len + 1);
271 ret->Type = SS_DATATYPE_STRING;
272 ret->ReferenceCount = 1;
273 ret->String.Length = len;
276 case SS_DATATYPE_INTEGER: sprintf(ret->String.Data, "%li", Source->Integer); break;
277 case SS_DATATYPE_REAL:
278 sprintf(ret->String.Data, "%g", Source->Real); break;
280 AST_RuntimeError(NULL, "Invalid cast from %i to String", Source->Type);
288 AST_RuntimeError(NULL, "BUG - BUG REPORT: Unimplemented cast target %i", Type);
297 * \brief Condenses a value down to a boolean
299 int SpiderScript_IsValueTrue(tSpiderValue *Value)
301 if( Value == ERRPTR ) return 0;
302 if( Value == NULL ) return 0;
304 switch( (enum eSpiderScript_DataTypes)Value->Type )
306 case SS_DATATYPE_UNDEF:
309 case SS_DATATYPE_INTEGER:
310 return !!Value->Integer;
312 case SS_DATATYPE_REAL:
313 return (-.5f < Value->Real && Value->Real < 0.5f);
315 case SS_DATATYPE_STRING:
316 return Value->String.Length > 0;
318 case SS_DATATYPE_OBJECT:
319 return Value->Object != NULL;
321 case SS_DATATYPE_OPAQUE:
322 return Value->Opaque.Data != NULL;
324 case SS_DATATYPE_ARRAY:
325 return Value->Array.Length > 0;
327 AST_RuntimeError(NULL, "Unknown type %i in SpiderScript_IsValueTrue", Value->Type);
334 * \brief Free a value
335 * \note Just calls Object_Dereference
337 void SpiderScript_FreeValue(tSpiderValue *Value)
339 Object_Dereference(Value);
343 * \brief Dump a value into a string
344 * \return Heap string
346 char *SpiderScript_DumpValue(tSpiderValue *Value)
349 if( Value == ERRPTR )
350 return strdup("ERRPTR");
352 return strdup("null");
354 switch( (enum eSpiderScript_DataTypes)Value->Type )
356 case SS_DATATYPE_UNDEF: return strdup("undefined");
358 case SS_DATATYPE_INTEGER:
359 ret = malloc( sizeof(Value->Integer)*2 + 3 );
360 sprintf(ret, "0x%lx", Value->Integer);
363 case SS_DATATYPE_REAL:
364 ret = malloc( sprintf(NULL, "%f", Value->Real) + 1 );
365 sprintf(ret, "%f", Value->Real);
368 case SS_DATATYPE_STRING:
369 ret = malloc( Value->String.Length + 3 );
371 strcpy(ret+1, Value->String.Data);
372 ret[Value->String.Length+1] = '"';
373 ret[Value->String.Length+2] = '\0';
376 case SS_DATATYPE_OBJECT:
377 ret = malloc( sprintf(NULL, "{%s *%p}", Value->Object->Type->Name, Value->Object) + 1 );
378 sprintf(ret, "{%s *%p}", Value->Object->Type->Name, Value->Object);
381 case SS_DATATYPE_OPAQUE:
382 ret = malloc( sprintf(NULL, "*%p", Value->Opaque.Data) + 1 );
383 sprintf(ret, "*%p", Value->Opaque.Data);
386 case SS_DATATYPE_ARRAY:
387 return strdup("Array");
390 AST_RuntimeError(NULL, "Unknown type %i in Object_Dump", Value->Type);
397 * \brief Execute a script function
398 * \param Script Script context to execute in
399 * \param Function Function name to execute
400 * \param NArguments Number of arguments to pass
401 * \param Arguments Arguments passed
403 tSpiderValue *SpiderScript_ExecuteFunction(tSpiderScript *Script,
404 tSpiderNamespace *Namespace, const char *Function,
405 int NArguments, tSpiderValue **Arguments)
407 char *trueName = NULL;
408 int bFound = 0; // Used to keep nesting levels down
409 tSpiderValue *ret = ERRPTR;
410 tSpiderFunction *fcn;
412 // First: Find the function in the script
414 tAST_Function *astFcn;
415 for( astFcn = Script->Script->Functions; astFcn; astFcn = astFcn->Next )
417 if( strcmp(astFcn->Name, Function) == 0 )
427 // Build a block State
431 bs.BaseNamespace = &Script->Variant->RootNamespace;
432 bs.CurNamespace = NULL;
434 bs.Ident = giNextBlockIdent ++;
437 for( arg = astFcn->Arguments; arg; arg = arg->NextSibling, i++ )
439 if( i >= NArguments ) break; // TODO: Return gracefully
442 arg->DefVar.DataType, arg->DefVar.Name,
447 ret = AST_ExecuteNode(&bs, astFcn->Code);
450 Object_Dereference(ret); // Dereference output of last block statement
451 ret = bs.RetVal; // Set to return value of block
457 tAST_Variable *nextVar = bs.FirstVar->Next;
458 Variable_Destroy( bs.FirstVar );
459 bs.FirstVar = nextVar;
464 // Didn't find it in script?
467 fcn = NULL; // Just to allow the below code to be neat
469 // Second: Scan current namespace
470 if( !fcn && Namespace )
472 for( fcn = Namespace->Functions; fcn; fcn = fcn->Next )
474 if( strcmp( fcn->Name, Function ) == 0 )
479 // Third: Search the variant's global exports
482 for( fcn = Script->Variant->Functions; fcn; fcn = fcn->Next )
484 if( strcmp( fcn->Name, Function ) == 0 )
489 // Fourth: Search language exports
492 for( fcn = gpExports_First; fcn; fcn = fcn->Next )
494 if( strcmp( fcn->Name, Function ) == 0 )
502 // TODO: Type Checking
503 ret = fcn->Handler( Script, NArguments, Arguments );
511 fprintf(stderr, "Undefined reference to '%s'\n", trueName);
519 * \brief Execute an object method function
520 * \param Script Script context to execute in
521 * \param Function Function name to execute
522 * \param NArguments Number of arguments to pass
523 * \param Arguments Arguments passed
525 tSpiderValue *SpiderScript_ExecuteMethod(tSpiderScript *Script, tSpiderObject *Object,
526 const char *MethodName,
527 int NArguments, tSpiderValue **Arguments)
529 tSpiderFunction *fcn;
531 tSpiderValue *newargs[NArguments+1];
534 for( fcn = Object->Type->Methods; fcn; fcn = fcn->Next )
536 if( strcmp(fcn->Name, MethodName) == 0 )
542 AST_RuntimeError(NULL, "Class '%s' does not have a method '%s'",
543 Object->Type->Name, MethodName);
547 this.Type = SS_DATATYPE_OBJECT;
548 this.ReferenceCount = 1;
549 this.Object = Object;
552 memcpy(&newargs[1], Arguments, NArguments*sizeof(tSpiderValue*));
554 // TODO: Type Checking
555 for( i = 0; fcn->ArgTypes[i]; i ++ )
557 if( i >= NArguments ) {
558 AST_RuntimeError(NULL, "Argument count mismatch (%i passed)",
562 if( Arguments[i] && Arguments[i]->Type != fcn->ArgTypes[i] )
564 AST_RuntimeError(NULL, "Argument type mismatch (%i, expected %i)",
565 Arguments[i]->Type, fcn->ArgTypes[i]);
570 return fcn->Handler(Script, NArguments+1, newargs);
574 * \brief Execute a script function
575 * \param Script Script context to execute in
576 * \param Function Function name to execute
577 * \param NArguments Number of arguments to pass
578 * \param Arguments Arguments passed
580 tSpiderValue *SpiderScript_CreateObject(tSpiderScript *Script,
581 tSpiderNamespace *Namespace, const char *ClassName,
582 int NArguments, tSpiderValue **Arguments)
584 int bFound = 0; // Used to keep nesting levels down
585 tSpiderValue *ret = ERRPTR;
586 tSpiderObjectDef *class;
588 // First: Find the function in the script
589 // TODO: Implement scripted classes
592 tAST_Function *astClass;
593 for( astClass = Script->Script->Classes; astClass; astClass = astClass->Next )
595 if( strcmp(astClass->Name, ClassName) == 0 )
605 // Build a block State
609 bs.BaseNamespace = &Script->Variant->RootNamespace;
610 bs.CurNamespace = NULL;
612 bs.Ident = giNextBlockIdent ++;
614 for( arg = astFcn->Arguments; arg; arg = arg->NextSibling, i++ )
616 if( i >= NArguments ) break; // TODO: Return gracefully
619 arg->DefVar.DataType, arg->DefVar.Name,
624 ret = AST_ExecuteNode(&bs, astFcn->Code);
627 Object_Dereference(ret); // Dereference output of last block statement
628 ret = bs.RetVal; // Set to return value of block
634 tAST_Variable *nextVar = bs.FirstVar->Next;
635 Variable_Destroy( bs.FirstVar );
636 bs.FirstVar = nextVar;
642 // Didn't find it in script?
645 class = NULL; // Just to allow the below code to be neat
647 // Second: Scan current namespace
648 if( !class && Namespace )
650 for( class = Namespace->Classes; class; class = class->Next )
652 if( strcmp( class->Name, ClassName ) == 0 )
658 // Third: Search the variant's global exports
661 for( class = Script->Variant->Classes; class; class = fcn->Next )
663 if( strcmp( class->Name, Function ) == 0 )
670 // Fourth: Search language exports
673 for( class = gpExports_First; class; class = fcn->Next )
675 if( strcmp( class->Name, ClassName ) == 0 )
685 // TODO: Type Checking
686 obj = class->Constructor( NArguments, Arguments );
687 if( obj == NULL || obj == ERRPTR )
690 ret = malloc( sizeof(tSpiderValue) );
691 ret->Type = SS_DATATYPE_OBJECT;
692 ret->ReferenceCount = 1;
701 fprintf(stderr, "Undefined reference to '%s'\n", ClassName);
710 * \brief Execute an AST node and return its value
712 tSpiderValue *AST_ExecuteNode(tAST_BlockState *Block, tAST_Node *Node)
715 tSpiderValue *ret = NULL, *tmpobj;
716 tSpiderValue *op1, *op2; // Binary operations
717 int cmp; // Used in comparisons
723 case NODETYPE_NOP: ret = NULL; break;
728 tAST_BlockState blockInfo;
729 blockInfo.Parent = Block;
730 blockInfo.Script = Block->Script;
731 blockInfo.FirstVar = NULL;
732 blockInfo.RetVal = NULL;
733 blockInfo.BaseNamespace = Block->BaseNamespace;
734 blockInfo.CurNamespace = NULL;
735 blockInfo.Ident = giNextBlockIdent ++;
737 for(node = Node->Block.FirstChild; node && !blockInfo.RetVal; node = node->NextSibling )
739 ret = AST_ExecuteNode(&blockInfo, node);
740 if(ret == ERRPTR) break; // Error check
741 if(ret != NULL) Object_Dereference(ret); // Free unused value
743 // Clean up variables
744 while(blockInfo.FirstVar)
746 tAST_Variable *nextVar = blockInfo.FirstVar->Next;
747 Variable_Destroy( blockInfo.FirstVar );
748 blockInfo.FirstVar = nextVar;
752 if( blockInfo.RetVal )
753 Block->RetVal = blockInfo.RetVal;
759 case NODETYPE_ASSIGN:
760 if( Node->Assign.Dest->Type != NODETYPE_VARIABLE ) {
761 AST_RuntimeError(Node, "LVALUE of assignment is not a variable");
764 ret = AST_ExecuteNode(Block, Node->Assign.Value);
765 if(ret == ERRPTR) return ERRPTR;
767 if( Node->Assign.Operation != NODETYPE_NOP )
769 tSpiderValue *varVal = Variable_GetValue(Block, Node->Assign.Dest);
771 value = AST_ExecuteNode_BinOp(Block, Node->Assign.Operation, varVal, ret);
772 if(value == ERRPTR) return ERRPTR;
773 if(ret) Object_Dereference(ret);
774 if(varVal) Object_Dereference(varVal);
778 if( Variable_SetValue( Block, Node->Assign.Dest, ret ) ) {
779 Object_Dereference( ret );
784 case NODETYPE_POSTINC:
785 case NODETYPE_POSTDEC:
787 tSpiderValue *varVal, *value, *one;
788 if( Node->UniOp.Value->Type != NODETYPE_VARIABLE ) {
789 AST_RuntimeError(Node, "LVALUE of assignment is not a variable");
793 varVal = Variable_GetValue(Block, Node->Assign.Dest);
794 one = SpiderScript_CreateInteger(1);
796 if( Node->Type == NODETYPE_POSTDEC )
797 value = AST_ExecuteNode_BinOp(Block, NODETYPE_SUBTRACT, varVal, one);
799 value = AST_ExecuteNode_BinOp(Block, NODETYPE_ADD, varVal, one);
800 if( value == ERRPTR )
802 Object_Dereference(one); // Free constant one
806 if( Variable_SetValue( Block, Node->Assign.Dest, value ) ) {
807 Object_Dereference( ret );
810 Object_Dereference( value );
815 case NODETYPE_METHODCALL:
816 case NODETYPE_FUNCTIONCALL:
817 case NODETYPE_CREATEOBJECT:
818 // Logical block (used to allocate `params`)
820 tSpiderValue *params[Node->FunctionCall.NumArgs];
822 for(node = Node->FunctionCall.FirstArg; node; node = node->NextSibling)
824 params[i] = AST_ExecuteNode(Block, node);
825 if( params[i] == ERRPTR ) {
826 while(i--) Object_Dereference(params[i]);
833 if( !Block->CurNamespace )
834 Block->CurNamespace = Block->BaseNamespace;
837 if( Node->Type == NODETYPE_CREATEOBJECT )
839 ret = SpiderScript_CreateObject(Block->Script,
841 Node->FunctionCall.Name,
842 Node->FunctionCall.NumArgs, params
845 else if( Node->Type == NODETYPE_METHODCALL )
847 tSpiderValue *obj = AST_ExecuteNode(Block, Node->FunctionCall.Object);
848 if( !obj || obj == ERRPTR || obj->Type != SS_DATATYPE_OBJECT ) {
849 AST_RuntimeError(Node->FunctionCall.Object,
850 "Type Mismatch - Required SS_DATATYPE_OBJECT for method call");
851 while(i--) Object_Dereference(params[i]);
855 ret = SpiderScript_ExecuteMethod(Block->Script,
856 obj->Object, Node->FunctionCall.Name,
857 Node->FunctionCall.NumArgs, params
859 Object_Dereference(obj);
863 ret = SpiderScript_ExecuteFunction(Block->Script,
864 Block->CurNamespace, Node->FunctionCall.Name,
865 Node->FunctionCall.NumArgs, params
870 // Dereference parameters
871 while(i--) Object_Dereference(params[i]);
879 ret = AST_ExecuteNode(Block, Node->If.Condition);
880 if( ret == ERRPTR ) break;
881 if( SpiderScript_IsValueTrue(ret) ) {
882 tmpobj = AST_ExecuteNode(Block, Node->If.True);
885 tmpobj = AST_ExecuteNode(Block, Node->If.False);
887 Object_Dereference(ret);
888 if( tmpobj == ERRPTR ) return ERRPTR;
889 Object_Dereference(tmpobj);
895 ret = AST_ExecuteNode(Block, Node->For.Init);
896 if(ret == ERRPTR) break;
897 if( Node->For.bCheckAfter )
900 Object_Dereference(ret);
901 ret = AST_ExecuteNode(Block, Node->For.Code);
902 if(ret == ERRPTR) return ERRPTR;
903 Object_Dereference(ret);
904 ret = AST_ExecuteNode(Block, Node->For.Increment);
905 if(ret == ERRPTR) return ERRPTR;
906 Object_Dereference(ret);
907 ret = AST_ExecuteNode(Block, Node->For.Condition);
908 if(ret == ERRPTR) return ERRPTR;
909 } while( SpiderScript_IsValueTrue(ret) );
913 Object_Dereference(ret);
914 ret = AST_ExecuteNode(Block, Node->For.Condition);
915 if(ret == ERRPTR) return ERRPTR;
916 while( SpiderScript_IsValueTrue(ret) ) {
917 Object_Dereference(ret);
918 ret = AST_ExecuteNode(Block, Node->For.Code);
919 if(ret == ERRPTR) return ERRPTR;
920 Object_Dereference(ret);
921 ret = AST_ExecuteNode(Block, Node->For.Increment);
922 if(ret == ERRPTR) return ERRPTR;
923 Object_Dereference(ret);
924 ret = AST_ExecuteNode(Block, Node->For.Condition);
925 if(ret == ERRPTR) return ERRPTR;
928 Object_Dereference(ret);
933 case NODETYPE_RETURN:
934 ret = AST_ExecuteNode(Block, Node->UniOp.Value);
935 if(ret == ERRPTR) break;
936 Block->RetVal = ret; // Return value set
937 ret = NULL; // the `return` statement does not return a value
941 case NODETYPE_DEFVAR:
943 if( Variable_Define(Block, Node->DefVar.DataType, Node->DefVar.Name, NULL) == ERRPTR )
950 tSpiderNamespace *ns;
952 // Set current namespace if unset
953 if( !Block->CurNamespace )
954 Block->CurNamespace = Block->BaseNamespace;
956 // Empty string means use the root namespace
957 if( Node->Scope.Name[0] == '\0' )
959 ns = &Block->Script->Variant->RootNamespace;
963 // Otherwise scan the current namespace for the element
964 for( ns = Block->CurNamespace->FirstChild; ns; ns = ns->Next )
966 if( strcmp(ns->Name, Node->Scope.Name) == 0 )
971 AST_RuntimeError(Node, "Unknown namespace '%s'", Node->Scope.Name);
975 Block->CurNamespace = ns;
977 ret = AST_ExecuteNode(Block, Node->Scope.Element);
982 case NODETYPE_VARIABLE:
983 ret = Variable_GetValue( Block, Node );
986 // Element of an Object
987 case NODETYPE_ELEMENT:
988 tmpobj = AST_ExecuteNode( Block, Node->Scope.Element );
989 if(tmpobj == ERRPTR) return ERRPTR;
990 if( !tmpobj || tmpobj->Type != SS_DATATYPE_OBJECT )
992 AST_RuntimeError(Node->Scope.Element, "Unable to dereference a non-object");
997 for( i = 0; i < tmpobj->Object->Type->NAttributes; i ++ )
999 if( strcmp(Node->Scope.Name, tmpobj->Object->Type->AttributeDefs[i].Name) == 0 )
1001 ret = tmpobj->Object->Attributes[i];
1002 Object_Reference(ret);
1006 if( i == tmpobj->Object->Type->NAttributes )
1008 AST_RuntimeError(Node->Scope.Element, "Unknown attribute '%s' of class '%s'",
1009 Node->Scope.Name, tmpobj->Object->Type->Name);
1014 // Cast a value to another
1017 tmpobj = AST_ExecuteNode(Block, Node->Cast.Value);
1018 if(tmpobj == ERRPTR) return ERRPTR;
1019 ret = SpiderScript_CastValueTo( Node->Cast.DataType, tmpobj );
1020 Object_Dereference(tmpobj);
1024 // Index into an array
1025 case NODETYPE_INDEX:
1026 op1 = AST_ExecuteNode(Block, Node->BinOp.Left); // Array
1027 if(op1 == ERRPTR) return ERRPTR;
1028 op2 = AST_ExecuteNode(Block, Node->BinOp.Right); // Offset
1030 Object_Dereference(op1);
1034 if( !op1 || op1->Type != SS_DATATYPE_ARRAY )
1036 // TODO: Implement "operator []" on objects
1037 AST_RuntimeError(Node, "Indexing non-array");
1042 if( (!op2 || op2->Type != SS_DATATYPE_INTEGER) && !Block->Script->Variant->bImplicitCasts ) {
1043 AST_RuntimeError(Node, "Array index is not an integer");
1048 if( !op2 || op2->Type != SS_DATATYPE_INTEGER )
1050 tmpobj = SpiderScript_CastValueTo(SS_DATATYPE_INTEGER, op2);
1051 Object_Dereference(op2);
1055 if( op2->Integer >= op1->Array.Length ) {
1056 AST_RuntimeError(Node, "Array index out of bounds %i >= %i",
1057 op2->Integer, op1->Array.Length);
1062 ret = op1->Array.Items[ op2->Integer ];
1063 Object_Reference(ret);
1065 Object_Dereference(op1);
1066 Object_Dereference(op2);
1069 // TODO: Implement runtime constants
1070 case NODETYPE_CONSTANT:
1071 // TODO: Scan namespace for function
1072 AST_RuntimeError(Node, "TODO - Runtime Constants");
1077 case NODETYPE_STRING:
1078 case NODETYPE_INTEGER:
1080 ret = &Node->Constant;
1081 Object_Reference(ret);
1084 // --- Operations ---
1085 // Boolean Operations
1086 case NODETYPE_LOGICALNOT: // Logical NOT (!)
1087 op1 = AST_ExecuteNode(Block, Node->UniOp.Value);
1088 if(op1 == ERRPTR) return ERRPTR;
1089 ret = SpiderScript_CreateInteger( !SpiderScript_IsValueTrue(op1) );
1090 Object_Dereference(op1);
1092 case NODETYPE_LOGICALAND: // Logical AND (&&)
1093 case NODETYPE_LOGICALOR: // Logical OR (||)
1094 case NODETYPE_LOGICALXOR: // Logical XOR (^^)
1095 op1 = AST_ExecuteNode(Block, Node->BinOp.Left);
1096 if(op1 == ERRPTR) return ERRPTR;
1097 op2 = AST_ExecuteNode(Block, Node->BinOp.Right);
1099 Object_Dereference(op1);
1103 switch( Node->Type )
1105 case NODETYPE_LOGICALAND:
1106 ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) && SpiderScript_IsValueTrue(op2) );
1108 case NODETYPE_LOGICALOR:
1109 ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) || SpiderScript_IsValueTrue(op2) );
1111 case NODETYPE_LOGICALXOR:
1112 ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) ^ SpiderScript_IsValueTrue(op2) );
1117 // Free intermediate objects
1118 Object_Dereference(op1);
1119 Object_Dereference(op2);
1123 case NODETYPE_EQUALS:
1124 case NODETYPE_LESSTHAN:
1125 case NODETYPE_GREATERTHAN:
1126 case NODETYPE_LESSTHANEQUAL:
1127 case NODETYPE_GREATERTHANEQUAL:
1128 op1 = AST_ExecuteNode(Block, Node->BinOp.Left);
1129 if(op1 == ERRPTR) return ERRPTR;
1130 op2 = AST_ExecuteNode(Block, Node->BinOp.Right);
1132 Object_Dereference(op1);
1137 if( !op1 || !op2 ) {
1138 AST_RuntimeError(Node, "NULL Comparison (%p and %p)", op1, op2);
1139 if(op1) Object_Dereference(op1);
1140 if(op2) Object_Dereference(op2);
1141 ret = SpiderScript_CreateInteger( !op1 && !op2 );
1146 if( op1->Type != op2->Type ) {
1147 // If dynamically typed, convert op2 to op1's type
1148 if(Block->Script->Variant->bImplicitCasts)
1151 op2 = SpiderScript_CastValueTo(op1->Type, op2);
1152 Object_Dereference(tmpobj);
1154 Object_Dereference(op1);
1158 // If statically typed, this should never happen, but catch it anyway
1160 AST_RuntimeError(Node, "Statically typed implicit cast %i <op> %i",
1161 op1->Type, op2->Type);
1169 // - String Compare (does a strcmp, well memcmp)
1170 case SS_DATATYPE_STRING:
1171 // Call memcmp to do most of the work
1173 op1->String.Data, op2->String.Data,
1174 (op1->String.Length < op2->String.Length) ? op1->String.Length : op2->String.Length
1176 // Handle reaching the end of the string
1178 if( op1->String.Length == op2->String.Length )
1180 else if( op1->String.Length < op2->String.Length )
1187 // - Integer Comparisons
1188 case SS_DATATYPE_INTEGER:
1189 if( op1->Integer == op2->Integer )
1191 else if( op1->Integer < op2->Integer )
1196 // - Real Number Comparisons
1197 case SS_DATATYPE_REAL:
1198 cmp = (op1->Real - op2->Real) / op2->Real * 10000; // < 0.1% difference is equality
1201 AST_RuntimeError(Node, "TODO - Comparison of type %i", op1->Type);
1206 // Free intermediate objects
1207 Object_Dereference(op1);
1208 Object_Dereference(op2);
1217 case NODETYPE_EQUALS: ret = SpiderScript_CreateInteger(cmp == 0); break;
1218 case NODETYPE_LESSTHAN: ret = SpiderScript_CreateInteger(cmp < 0); break;
1219 case NODETYPE_GREATERTHAN: ret = SpiderScript_CreateInteger(cmp > 0); break;
1220 case NODETYPE_LESSTHANEQUAL: ret = SpiderScript_CreateInteger(cmp <= 0); break;
1221 case NODETYPE_GREATERTHANEQUAL: ret = SpiderScript_CreateInteger(cmp >= 0); break;
1223 AST_RuntimeError(Node, "Exec,CmpOp unknown op %i", Node->Type);
1229 // General Unary Operations
1230 case NODETYPE_BWNOT: // Bitwise NOT (~)
1231 case NODETYPE_NEGATE: // Negation (-)
1232 op1 = AST_ExecuteNode(Block, Node->UniOp.Value);
1233 if(op1 == ERRPTR) return ERRPTR;
1234 ret = AST_ExecuteNode_UniOp(Block, Node->Type, op1);
1235 Object_Dereference(op1);
1238 // General Binary Operations
1240 case NODETYPE_SUBTRACT:
1241 case NODETYPE_MULTIPLY:
1242 case NODETYPE_DIVIDE:
1243 case NODETYPE_MODULO:
1244 case NODETYPE_BWAND:
1246 case NODETYPE_BWXOR:
1247 case NODETYPE_BITSHIFTLEFT:
1248 case NODETYPE_BITSHIFTRIGHT:
1249 case NODETYPE_BITROTATELEFT:
1251 op1 = AST_ExecuteNode(Block, Node->BinOp.Left);
1252 if(op1 == ERRPTR) return ERRPTR;
1253 op2 = AST_ExecuteNode(Block, Node->BinOp.Right);
1255 Object_Dereference(op1);
1259 ret = AST_ExecuteNode_BinOp(Block, Node->Type, op1, op2);
1261 // Free intermediate objects
1262 Object_Dereference(op1);
1263 Object_Dereference(op2);
1268 // AST_RuntimeError(Node, "BUG - SpiderScript AST_ExecuteNode Unimplemented %i", Node->Type);
1272 #if TRACE_NODE_RETURNS
1273 if(ret && ret != ERRPTR) {
1274 AST_RuntimeError(Node, "Ret type of %p %i is %i", Node, Node->Type, ret->Type);
1277 AST_RuntimeError(Node, "Ret type of %p %i is %p", Node, Node->Type, ret);
1284 tSpiderValue *AST_ExecuteNode_UniOp(tAST_BlockState *Block, int Operation, tSpiderValue *Value)
1288 if( Value->Type == SS_DATATYPE_OBJECT )
1290 const char *fcnname;
1293 case NODETYPE_NEGATE: fcnname = "-ve"; break;
1294 case NODETYPE_BWNOT: fcnname = "~"; break;
1295 default: fcnname = NULL; break;
1300 ret = Object_ExecuteMethod(Value->Object, fcnname, );
1303 // Fall through and try casting (which will usually fail)
1309 // Integer Operations
1310 case SS_DATATYPE_INTEGER:
1313 case NODETYPE_NEGATE: ret = SpiderScript_CreateInteger( -Value->Integer ); break;
1314 case NODETYPE_BWNOT: ret = SpiderScript_CreateInteger( ~Value->Integer ); break;
1316 AST_RuntimeError(NULL, "SpiderScript internal error: Exec,UniOP,Integer unknown op %i", Operation);
1321 // Real number Operations
1322 case SS_DATATYPE_REAL:
1325 case NODETYPE_NEGATE: ret = SpiderScript_CreateInteger( -Value->Real ); break;
1327 AST_RuntimeError(NULL, "SpiderScript internal error: Exec,UniOP,Real unknown op %i", Operation);
1334 AST_RuntimeError(NULL, "Invalid operation (%i) on type (%i)", Operation, Value->Type);
1342 tSpiderValue *AST_ExecuteNode_BinOp(tAST_BlockState *Block, int Operation, tSpiderValue *Left, tSpiderValue *Right)
1344 tSpiderValue *preCastValue = Right;
1348 if( Left && Right && Left->Type != Right->Type )
1352 // - Operator overload functions
1353 if( Left->Type == SS_DATATYPE_OBJECT )
1355 const char *fcnname;
1358 case NODETYPE_ADD: fcnname = "+"; break;
1359 case NODETYPE_SUBTRACT: fcnname = "-"; break;
1360 case NODETYPE_MULTIPLY: fcnname = "*"; break;
1361 case NODETYPE_DIVIDE: fcnname = "/"; break;
1362 case NODETYPE_MODULO: fcnname = "%"; break;
1363 case NODETYPE_BWAND: fcnname = "&"; break;
1364 case NODETYPE_BWOR: fcnname = "|"; break;
1365 case NODETYPE_BWXOR: fcnname = "^"; break;
1366 case NODETYPE_BITSHIFTLEFT: fcnname = "<<"; break;
1367 case NODETYPE_BITSHIFTRIGHT:fcnname = ">>"; break;
1368 case NODETYPE_BITROTATELEFT:fcnname = "<<<"; break;
1369 default: fcnname = NULL; break;
1374 ret = Object_ExecuteMethod(Left->Object, fcnname, Right);
1377 // Fall through and try casting (which will usually fail)
1382 // If implicit casts are allowed, convert Right to Left's type
1383 if(Block->Script->Variant->bImplicitCasts)
1385 Right = SpiderScript_CastValueTo(Left->Type, Right);
1389 // If statically typed, this should never happen, but catch it anyway
1391 AST_RuntimeError(NULL, "Implicit cast not allowed (from %i to %i)", Right->Type, Left->Type);
1397 if( Left == NULL || Right == NULL ) {
1398 if(Right && Right != preCastValue) free(Right);
1405 // String Concatenation
1406 case SS_DATATYPE_STRING:
1409 case NODETYPE_ADD: // Concatenate
1410 ret = Object_StringConcat(Left, Right);
1413 AST_RuntimeError(NULL, "SpiderScript internal error: Exec,BinOP,String unknown op %i", Operation);
1418 // Integer Operations
1419 case SS_DATATYPE_INTEGER:
1422 case NODETYPE_ADD: ret = SpiderScript_CreateInteger( Left->Integer + Right->Integer ); break;
1423 case NODETYPE_SUBTRACT: ret = SpiderScript_CreateInteger( Left->Integer - Right->Integer ); break;
1424 case NODETYPE_MULTIPLY: ret = SpiderScript_CreateInteger( Left->Integer * Right->Integer ); break;
1425 case NODETYPE_DIVIDE: ret = SpiderScript_CreateInteger( Left->Integer / Right->Integer ); break;
1426 case NODETYPE_MODULO: ret = SpiderScript_CreateInteger( Left->Integer % Right->Integer ); break;
1427 case NODETYPE_BWAND: ret = SpiderScript_CreateInteger( Left->Integer & Right->Integer ); break;
1428 case NODETYPE_BWOR: ret = SpiderScript_CreateInteger( Left->Integer | Right->Integer ); break;
1429 case NODETYPE_BWXOR: ret = SpiderScript_CreateInteger( Left->Integer ^ Right->Integer ); break;
1430 case NODETYPE_BITSHIFTLEFT: ret = SpiderScript_CreateInteger( Left->Integer << Right->Integer ); break;
1431 case NODETYPE_BITSHIFTRIGHT:ret = SpiderScript_CreateInteger( Left->Integer >> Right->Integer ); break;
1432 case NODETYPE_BITROTATELEFT:
1433 ret = SpiderScript_CreateInteger( (Left->Integer << Right->Integer) | (Left->Integer >> (64-Right->Integer)) );
1436 AST_RuntimeError(NULL, "SpiderScript internal error: Exec,BinOP,Integer unknown op %i", Operation);
1443 case SS_DATATYPE_REAL:
1446 case NODETYPE_ADD: ret = SpiderScript_CreateReal( Left->Real + Right->Real ); break;
1447 case NODETYPE_SUBTRACT: ret = SpiderScript_CreateReal( Left->Real - Right->Real ); break;
1448 case NODETYPE_MULTIPLY: ret = SpiderScript_CreateReal( Left->Real * Right->Real ); break;
1449 case NODETYPE_DIVIDE: ret = SpiderScript_CreateReal( Left->Real / Right->Real ); break;
1451 AST_RuntimeError(NULL, "SpiderScript internal error: Exec,BinOP,Real unknown op %i", Operation);
1458 AST_RuntimeError(NULL, "BUG - Invalid operation (%i) on type (%i)", Operation, Left->Type);
1463 if(Right && Right != preCastValue) free(Right);
1469 * \brief Define a variable
1470 * \param Block Current block state
1471 * \param Type Type of the variable
1472 * \param Name Name of the variable
1473 * \return Boolean Failure
1475 tAST_Variable *Variable_Define(tAST_BlockState *Block, int Type, const char *Name, tSpiderValue *Value)
1477 tAST_Variable *var, *prev = NULL;
1479 for( var = Block->FirstVar; var; prev = var, var = var->Next )
1481 if( strcmp(var->Name, Name) == 0 ) {
1482 AST_RuntimeError(NULL, "Redefinition of variable '%s'", Name);
1487 var = malloc( sizeof(tAST_Variable) + strlen(Name) + 1 );
1490 var->Object = Value;
1491 if(Value) Object_Reference(Value);
1492 strcpy(var->Name, Name);
1494 if(prev) prev->Next = var;
1495 else Block->FirstVar = var;
1497 //printf("Defined variable %s (%i)\n", Name, Type);
1502 tAST_Variable *Variable_Lookup(tAST_BlockState *Block, tAST_Node *VarNode, int CreateType)
1504 tAST_Variable *var = NULL;
1507 if( VarNode->BlockState == Block && VarNode->BlockIdent == Block->Ident ) {
1508 var = VarNode->ValueCache;
1509 #if TRACE_VAR_LOOKUPS
1510 AST_RuntimeMessage(VarNode, "debug", "Fast var fetch on '%s' %p (%p:%i)",
1511 VarNode->Variable.Name, var,
1512 VarNode->BlockState, VarNode->BlockIdent
1518 tAST_BlockState *bs;
1519 for( bs = Block; bs; bs = bs->Parent )
1521 for( var = bs->FirstVar; var; var = var->Next )
1523 if( strcmp(var->Name, VarNode->Variable.Name) == 0 )
1531 if( Block->Script->Variant->bDyamicTyped && CreateType != SS_DATATYPE_UNDEF ) {
1533 var = Variable_Define(Block, CreateType, VarNode->Variable.Name, NULL);
1537 AST_RuntimeError(VarNode, "Variable '%s' is undefined", VarNode->Variable.Name);
1542 #if TRACE_VAR_LOOKUPS
1543 AST_RuntimeMessage(VarNode, "debug", "Saved variable lookup of '%s' %p (%p:%i)",
1544 VarNode->Variable.Name, var,
1545 Block, Block->Ident);
1548 VarNode->ValueCache = var;
1549 VarNode->BlockState = Block;
1550 VarNode->BlockIdent = Block->Ident;
1557 * \brief Set the value of a variable
1558 * \return Boolean Failure
1560 int Variable_SetValue(tAST_BlockState *Block, tAST_Node *VarNode, tSpiderValue *Value)
1562 tAST_Variable *var = Variable_Lookup(Block, VarNode, Value->Type);
1564 if( !var ) return -1;
1566 if( !Block->Script->Variant->bDyamicTyped && (Value && var->Type != Value->Type) )
1568 AST_RuntimeError(VarNode, "Type mismatch assigning to '%s'",
1569 VarNode->Variable.Name);
1573 // printf("Assign %p to '%s'\n", Value, var->Name);
1574 Object_Reference(Value);
1575 Object_Dereference(var->Object);
1576 var->Object = Value;
1581 * \brief Get the value of a variable
1583 tSpiderValue *Variable_GetValue(tAST_BlockState *Block, tAST_Node *VarNode)
1585 tAST_Variable *var = Variable_Lookup(Block, VarNode, 0);
1587 if( !var ) return ERRPTR;
1589 Object_Reference(var->Object);
1594 * \brief Destorys a variable
1596 void Variable_Destroy(tAST_Variable *Variable)
1598 // printf("Variable_Destroy: (%p'%s')\n", Variable, Variable->Name);
1599 Object_Dereference(Variable->Object);
1603 void AST_RuntimeMessage(tAST_Node *Node, const char *Type, const char *Format, ...)
1608 fprintf(stderr, "%s:%i: ", Node->File, Node->Line);
1610 fprintf(stderr, "%s: ", Type);
1611 va_start(args, Format);
1612 vfprintf(stderr, Format, args);
1614 fprintf(stderr, "\n");
1616 void AST_RuntimeError(tAST_Node *Node, const char *Format, ...)
1621 fprintf(stderr, "%s:%i: ", Node->File, Node->Line);
1623 fprintf(stderr, "error: ");
1624 va_start(args, Format);
1625 vfprintf(stderr, Format, args);
1627 fprintf(stderr, "\n");