+
+/**
+ * \brief Execute an object method function
+ * \param Script Script context to execute in
+ * \param Object Object in which to find the method
+ * \param MethodName Name of method to call
+ * \param NArguments Number of arguments to pass
+ * \param Arguments Arguments passed
+ */
+tSpiderValue *SpiderScript_ExecuteMethod(tSpiderScript *Script,
+ tSpiderObject *Object, const char *MethodName,
+ int NArguments, tSpiderValue **Arguments)
+{
+ tSpiderFunction *fcn;
+ tSpiderValue this;
+ tSpiderValue *newargs[NArguments+1];
+ int i;
+
+ // TODO: Support program defined objects
+
+ // Search for the function
+ for( fcn = Object->Type->Methods; fcn; fcn = fcn->Next )
+ {
+ if( strcmp(fcn->Name, MethodName) == 0 )
+ break;
+ }
+ // Error
+ if( !fcn )
+ {
+ AST_RuntimeError(NULL, "Class '%s' does not have a method '%s'",
+ Object->Type->Name, MethodName);
+ return ERRPTR;
+ }
+
+ // Create the "this" argument
+ this.Type = SS_DATATYPE_OBJECT;
+ this.ReferenceCount = 1;
+ this.Object = Object;
+ newargs[0] = &this;
+ memcpy(&newargs[1], Arguments, NArguments*sizeof(tSpiderValue*));
+
+ // Check the type of the arguments
+ for( i = 0; fcn->ArgTypes[i]; i ++ )
+ {
+ if( i >= NArguments ) {
+ for( ; fcn->ArgTypes[i]; i ++ ) ;
+ AST_RuntimeError(NULL, "Argument count mismatch (%i passed, %i expected)",
+ NArguments, i);
+ return ERRPTR;
+ }
+ if( Arguments[i] && Arguments[i]->Type != fcn->ArgTypes[i] )
+ {
+ AST_RuntimeError(NULL, "Argument type mismatch (%i, expected %i)",
+ Arguments[i]->Type, fcn->ArgTypes[i]);
+ return ERRPTR;
+ }
+ }
+
+ // Call handler
+ return fcn->Handler(Script, NArguments+1, newargs);
+}
+
+/**
+ * \brief Execute a script function
+ * \param Script Script context to execute in
+ * \param Function Function name to execute
+ * \param NArguments Number of arguments to pass
+ * \param Arguments Arguments passed
+ */
+tSpiderValue *SpiderScript_CreateObject(tSpiderScript *Script,
+ tSpiderNamespace *Namespace, const char *ClassName,
+ int NArguments, tSpiderValue **Arguments)
+{
+ int bFound = 0; // Used to keep nesting levels down
+ tSpiderValue *ret = ERRPTR;
+ tSpiderObjectDef *class;
+
+ // First: Find the function in the script
+ // TODO: Implement script-defined classes
+ #if 0
+ {
+ tAST_Function *astClass;
+ for( astClass = Script->Script->Classes; astClass; astClass = astClass->Next )
+ {
+ if( strcmp(astClass->Name, ClassName) == 0 )
+ break;
+ }
+ // Execute!
+ if(astClass)
+ {
+ tAST_BlockState bs;
+ tAST_Node *arg;
+ int i = 0;
+
+ // Build a block State
+ bs.FirstVar = NULL;
+ bs.RetVal = NULL;
+ bs.Parent = NULL;
+ bs.BaseNamespace = &Script->Variant->RootNamespace;
+ bs.CurNamespace = NULL;
+ bs.Script = Script;
+ bs.Ident = giNextBlockIdent ++;
+
+ for( arg = astFcn->Arguments; arg; arg = arg->NextSibling, i++ )
+ {
+ if( i >= NArguments ) break; // TODO: Return gracefully
+ // TODO: Type checks
+ Variable_Define(&bs,
+ arg->DefVar.DataType, arg->DefVar.Name,
+ Arguments[i]);
+ }
+
+ // Execute function
+ ret = AST_ExecuteNode(&bs, astFcn->Code);
+ if( ret != ERRPTR )
+ {
+ Object_Dereference(ret); // Dereference output of last block statement
+ ret = bs.RetVal; // Set to return value of block
+ }
+ bFound = 1;
+
+ while(bs.FirstVar)
+ {
+ tAST_Variable *nextVar = bs.FirstVar->Next;
+ Variable_Destroy( bs.FirstVar );
+ bs.FirstVar = nextVar;
+ }
+ }
+ }
+ #endif
+
+ // Didn't find it in script?
+ if(!bFound)
+ {
+ class = NULL; // Just to allow the below code to be neat
+
+ //if( !Namespace )
+ // Namespace = &Script->Variant->RootNamespace;
+
+ // Second: Scan current namespace
+ if( !class && Namespace )
+ {
+ for( class = Namespace->Classes; class; class = class->Next )
+ {
+ if( strcmp( class->Name, ClassName ) == 0 )
+ break;
+ }
+ }
+
+ #if 0
+ // Third: Search the variant's global exports
+ if( !class )
+ {
+ for( class = Script->Variant->Classes; class; class = fcn->Next )
+ {
+ if( strcmp( class->Name, Function ) == 0 )
+ break;
+ }
+ }
+ #endif
+
+ #if 0
+ // Fourth: Search language exports
+ if( !class )
+ {
+ for( class = gpExports_First; class; class = fcn->Next )
+ {
+ if( strcmp( class->Name, ClassName ) == 0 )
+ break;
+ }
+ }
+ #endif
+
+ // Execute!
+ if(class)
+ {
+ tSpiderObject *obj;
+ // TODO: Type Checking
+
+ // Call constructor
+ obj = class->Constructor( NArguments, Arguments );
+ if( obj == NULL || obj == ERRPTR )
+ return (void *)obj;
+
+ // Creatue return object
+ ret = malloc( sizeof(tSpiderValue) );
+ ret->Type = SS_DATATYPE_OBJECT;
+ ret->ReferenceCount = 1;
+ ret->Object = obj;
+ bFound = 1;
+ }
+ }
+
+ // Not found?
+ if(!bFound)
+ {
+ fprintf(stderr, "Undefined reference to class '%s'\n", ClassName);
+ return ERRPTR;
+ }
+
+ return ret;
+}
+
+
+/**
+ * \brief Execute an AST node and return its value
+ * \param Block Execution context
+ * \param Node Node to execute
+ */
+tSpiderValue *AST_ExecuteNode(tAST_BlockState *Block, tAST_Node *Node)
+{
+ tAST_Node *node;
+ tSpiderValue *ret = NULL, *tmpobj;
+ tSpiderValue *op1, *op2; // Binary operations
+ int cmp; // Used in comparisons
+ int i;
+
+ switch(Node->Type)
+ {
+ // No Operation
+ case NODETYPE_NOP:
+ ret = NULL;
+ break;
+
+ // Code block
+ case NODETYPE_BLOCK:
+ {
+ tAST_BlockState blockInfo;
+ blockInfo.Parent = Block;
+ blockInfo.Script = Block->Script;
+ blockInfo.FirstVar = NULL;
+ blockInfo.RetVal = NULL;
+ blockInfo.BaseNamespace = Block->BaseNamespace;
+ blockInfo.CurNamespace = NULL;
+ blockInfo.BreakTarget = NULL;
+ blockInfo.Ident = giNextBlockIdent ++;
+ ret = NULL;
+ // Loop over all nodes, or until the return value is set
+ for(node = Node->Block.FirstChild;
+ node && !blockInfo.RetVal && !blockInfo.BreakTarget;
+ node = node->NextSibling )
+ {
+ ret = AST_ExecuteNode(&blockInfo, node);
+ if(ret == ERRPTR) break; // Error check
+ if(ret != NULL) Object_Dereference(ret); // Free unused value
+ }
+ // Clean up variables
+ while(blockInfo.FirstVar)
+ {
+ tAST_Variable *nextVar = blockInfo.FirstVar->Next;
+ Variable_Destroy( blockInfo.FirstVar );
+ blockInfo.FirstVar = nextVar;
+ }
+ // Clear ret if not an error
+ if(ret != ERRPTR) ret = NULL;
+
+ // Set parent's return value if needed
+ if( blockInfo.RetVal )
+ Block->RetVal = blockInfo.RetVal;
+ if( blockInfo.BreakTarget ) {
+ Block->BreakTarget = blockInfo.BreakTarget;
+ Block->BreakType = blockInfo.BreakType;
+ }
+
+ // TODO: Unset break if break type deontes a block break
+ }
+
+ break;
+
+ // Assignment
+ case NODETYPE_ASSIGN:
+ // TODO: Support assigning to object attributes
+ if( Node->Assign.Dest->Type != NODETYPE_VARIABLE ) {
+ AST_RuntimeError(Node, "LVALUE of assignment is not a variable");
+ return ERRPTR;
+ }
+ ret = AST_ExecuteNode(Block, Node->Assign.Value);
+ if(ret == ERRPTR) return ERRPTR;
+
+ // Perform assignment operation
+ if( Node->Assign.Operation != NODETYPE_NOP )
+ {
+ tSpiderValue *varVal = Variable_GetValue(Block, Node->Assign.Dest);
+ tSpiderValue *value;
+ value = AST_ExecuteNode_BinOp(Block, Node, Node->Assign.Operation, varVal, ret);
+ if(value == ERRPTR) return ERRPTR;
+ if(ret) Object_Dereference(ret);
+ if(varVal) Object_Dereference(varVal);
+ ret = value;
+ }
+
+ // Set the variable value
+ if( Variable_SetValue( Block, Node->Assign.Dest, ret ) ) {
+ Object_Dereference( ret );
+ return ERRPTR;
+ }
+ break;
+
+ // Post increment/decrement
+ case NODETYPE_POSTINC:
+ case NODETYPE_POSTDEC:
+ {
+ tSpiderValue *varVal, *value;
+ static tSpiderValue one = {
+ .Type = SS_DATATYPE_INTEGER,
+ .ReferenceCount = 1,
+ {.Integer = 1}
+ };
+
+ // TODO: Support assigning to object attributes
+ if( Node->UniOp.Value->Type != NODETYPE_VARIABLE ) {
+ AST_RuntimeError(Node, "LVALUE of assignment is not a variable");
+ return ERRPTR;
+ }
+
+ // Get values (current variable contents and a static one)
+ varVal = Variable_GetValue(Block, Node->UniOp.Value);
+
+ if( Node->Type == NODETYPE_POSTDEC )
+ value = AST_ExecuteNode_BinOp(Block, Node, NODETYPE_SUBTRACT, varVal, &one);
+ else
+ value = AST_ExecuteNode_BinOp(Block, Node, NODETYPE_ADD, varVal, &one);
+ if( value == ERRPTR )
+ return ERRPTR;
+
+ ret = varVal;
+
+ if( Variable_SetValue( Block, Node->UniOp.Value, value ) ) {
+ Object_Dereference( ret );
+ return ERRPTR;
+ }
+ Object_Dereference( value );
+ }
+ break;
+
+ // Function Call
+ case NODETYPE_METHODCALL:
+ case NODETYPE_FUNCTIONCALL:
+ case NODETYPE_CREATEOBJECT:
+ // Logical block (used to allocate `params`)
+ {
+ tSpiderNamespace *ns = Block->CurNamespace;
+ tSpiderValue *params[Node->FunctionCall.NumArgs];
+ i = 0;
+ for(node = Node->FunctionCall.FirstArg; node; node = node->NextSibling)
+ {
+ params[i] = AST_ExecuteNode(Block, node);
+ if( params[i] == ERRPTR ) {
+ while(i--) Object_Dereference(params[i]);
+ ret = ERRPTR;
+ goto _return;
+ }
+ i ++;
+ }
+
+ if( !ns ) ns = Block->BaseNamespace;
+
+ // Call the function
+ if( Node->Type == NODETYPE_CREATEOBJECT )
+ {
+ ret = SpiderScript_CreateObject(Block->Script,
+ ns,
+ Node->FunctionCall.Name,
+ Node->FunctionCall.NumArgs, params
+ );
+ }
+ else if( Node->Type == NODETYPE_METHODCALL )
+ {
+ tSpiderValue *obj = AST_ExecuteNode(Block, Node->FunctionCall.Object);
+ if( !obj || obj == ERRPTR || obj->Type != SS_DATATYPE_OBJECT ) {
+ AST_RuntimeError(Node->FunctionCall.Object,
+ "Type Mismatch - Required SS_DATATYPE_OBJECT for method call");
+ while(i--) Object_Dereference(params[i]);
+ ret = ERRPTR;
+ break;
+ }
+ ret = SpiderScript_ExecuteMethod(Block->Script,
+ obj->Object, Node->FunctionCall.Name,
+ Node->FunctionCall.NumArgs, params
+ );
+ Object_Dereference(obj);
+ }
+ else
+ {
+ ret = SpiderScript_ExecuteFunction(Block->Script,
+ ns, Node->FunctionCall.Name,
+ Node->FunctionCall.NumArgs, params
+ );
+ }
+
+
+ // Dereference parameters
+ while(i--) Object_Dereference(params[i]);
+
+ // falls out
+ }
+ break;
+
+ // Conditional
+ case NODETYPE_IF:
+ ret = AST_ExecuteNode(Block, Node->If.Condition);
+ if( ret == ERRPTR ) break;
+ if( SpiderScript_IsValueTrue(ret) ) {
+ tmpobj = AST_ExecuteNode(Block, Node->If.True);
+ }
+ else {
+ tmpobj = AST_ExecuteNode(Block, Node->If.False);
+ }
+ Object_Dereference(ret);
+ if( tmpobj == ERRPTR ) return ERRPTR;
+ Object_Dereference(tmpobj);
+ ret = NULL;
+ break;
+
+ // Loop
+ case NODETYPE_LOOP:
+ // Initialise
+ ret = AST_ExecuteNode(Block, Node->For.Init);
+ if(ret == ERRPTR) break;
+
+ // Check initial condition
+ if( !Node->For.bCheckAfter )
+ {
+ Object_Dereference(ret);
+
+ ret = AST_ExecuteNode(Block, Node->For.Condition);
+ if(ret == ERRPTR) return ERRPTR;
+ if(!SpiderScript_IsValueTrue(ret)) {
+ Object_Dereference(ret);
+ ret = NULL;
+ break;
+ }
+ }
+
+ // Perform loop
+ for( ;; )
+ {
+ Object_Dereference(ret);
+
+ // Code
+ ret = AST_ExecuteNode(Block, Node->For.Code);
+ if(ret == ERRPTR) return ERRPTR;
+ Object_Dereference(ret);
+
+ if(Block->BreakTarget)
+ {
+ if( Block->BreakTarget[0] == '\0' || strcmp(Block->BreakTarget, Node->For.Tag) == 0 )
+ {
+ // Ours
+ free((void*)Block->BreakTarget); Block->BreakTarget = NULL;
+ if( Block->BreakType == NODETYPE_CONTINUE ) {
+ // Continue, just keep going
+ }
+ else
+ break;
+ }
+ else
+ break; // Break out of this loop
+ }
+
+ // Increment
+ ret = AST_ExecuteNode(Block, Node->For.Increment);
+ if(ret == ERRPTR) return ERRPTR;
+ Object_Dereference(ret);
+
+ // Check condition
+ ret = AST_ExecuteNode(Block, Node->For.Condition);
+ if(ret == ERRPTR) return ERRPTR;
+ if(!SpiderScript_IsValueTrue(ret)) break;
+ }
+ Object_Dereference(ret);
+ ret = NULL;
+ break;
+
+ // Return
+ case NODETYPE_RETURN:
+ ret = AST_ExecuteNode(Block, Node->UniOp.Value);
+ if(ret == ERRPTR) break;
+ Block->RetVal = ret; // Return value set
+ ret = NULL; // the `return` statement does not return a value
+ break;
+
+ case NODETYPE_BREAK:
+ case NODETYPE_CONTINUE:
+ Block->BreakTarget = strdup(Node->Variable.Name);
+ Block->BreakType = Node->Type;
+ break;
+
+ // Define a variable
+ case NODETYPE_DEFVAR:
+ if( Node->DefVar.InitialValue ) {
+ tmpobj = AST_ExecuteNode(Block, Node->DefVar.InitialValue);
+ if(tmpobj == ERRPTR) return ERRPTR;
+ }
+ else {
+ tmpobj = NULL;
+ }
+ ret = NULL;
+ if( Variable_Define(Block, Node->DefVar.DataType, Node->DefVar.Name, tmpobj) == ERRPTR )
+ ret = ERRPTR;
+ Object_Dereference(tmpobj);
+ break;
+
+ // Scope
+ case NODETYPE_SCOPE:
+ {
+ tSpiderNamespace *ns;
+
+ // Set current namespace if unset
+ if( !Block->CurNamespace )
+ Block->CurNamespace = Block->BaseNamespace;
+
+ // Empty string means use the root namespace
+ if( Node->Scope.Name[0] == '\0' )
+ {
+ ns = &Block->Script->Variant->RootNamespace;
+ }
+ else
+ {
+ // Otherwise scan the current namespace for the element
+ for( ns = Block->CurNamespace->FirstChild; ns; ns = ns->Next )
+ {
+ if( strcmp(ns->Name, Node->Scope.Name) == 0 )
+ break;
+ }
+ }
+ if(!ns) {
+ AST_RuntimeError(Node, "Unknown namespace '%s'", Node->Scope.Name);
+ ret = ERRPTR;
+ break;
+ }
+ Block->CurNamespace = ns;
+
+ ret = AST_ExecuteNode(Block, Node->Scope.Element);
+ }
+ break;
+
+ // Variable
+ case NODETYPE_VARIABLE:
+ ret = Variable_GetValue( Block, Node );
+ break;
+
+ // Element of an Object
+ case NODETYPE_ELEMENT:
+ tmpobj = AST_ExecuteNode( Block, Node->Scope.Element );
+ if(tmpobj == ERRPTR) return ERRPTR;
+ if( !tmpobj || tmpobj->Type != SS_DATATYPE_OBJECT )
+ {
+ AST_RuntimeError(Node->Scope.Element, "Unable to dereference a non-object");
+ ret = ERRPTR;
+ break ;
+ }
+
+ for( i = 0; i < tmpobj->Object->Type->NAttributes; i ++ )
+ {
+ if( strcmp(Node->Scope.Name, tmpobj->Object->Type->AttributeDefs[i].Name) == 0 )
+ {
+ ret = tmpobj->Object->Attributes[i];
+ Object_Reference(ret);
+ break;
+ }
+ }
+ if( i == tmpobj->Object->Type->NAttributes )
+ {
+ AST_RuntimeError(Node->Scope.Element, "Unknown attribute '%s' of class '%s'",
+ Node->Scope.Name, tmpobj->Object->Type->Name);
+ ret = ERRPTR;
+ }
+ break;
+
+ // Cast a value to another
+ case NODETYPE_CAST:
+ {
+ tmpobj = AST_ExecuteNode(Block, Node->Cast.Value);
+ if(tmpobj == ERRPTR) return ERRPTR;
+ ret = SpiderScript_CastValueTo( Node->Cast.DataType, tmpobj );
+ Object_Dereference(tmpobj);
+ }
+ break;
+
+ // Index into an array
+ case NODETYPE_INDEX:
+ op1 = AST_ExecuteNode(Block, Node->BinOp.Left); // Array
+ if(op1 == ERRPTR) return ERRPTR;
+ op2 = AST_ExecuteNode(Block, Node->BinOp.Right); // Offset
+ if(op2 == ERRPTR) {
+ Object_Dereference(op1);
+ return ERRPTR;
+ }
+
+ if( !op1 || op1->Type != SS_DATATYPE_ARRAY )
+ {
+ // TODO: Implement "operator []" on objects
+ AST_RuntimeError(Node, "Indexing non-array");
+ ret = ERRPTR;
+ break;
+ }
+
+ if( (!op2 || op2->Type != SS_DATATYPE_INTEGER) && !Block->Script->Variant->bImplicitCasts ) {
+ AST_RuntimeError(Node, "Array index is not an integer");
+ ret = ERRPTR;
+ break;
+ }
+
+ if( !op2 || op2->Type != SS_DATATYPE_INTEGER )
+ {
+ tmpobj = SpiderScript_CastValueTo(SS_DATATYPE_INTEGER, op2);
+ Object_Dereference(op2);
+ op2 = tmpobj;
+ }
+
+ if( op2->Integer >= op1->Array.Length ) {
+ AST_RuntimeError(Node, "Array index out of bounds %i >= %i",
+ op2->Integer, op1->Array.Length);
+ ret = ERRPTR;
+ break;
+ }
+
+ ret = op1->Array.Items[ op2->Integer ];
+ Object_Reference(ret);
+
+ Object_Dereference(op1);
+ Object_Dereference(op2);
+ break;
+
+ // TODO: Implement runtime constants
+ case NODETYPE_CONSTANT:
+ // TODO: Scan namespace for function
+ AST_RuntimeError(Node, "TODO - Runtime Constants");
+ ret = ERRPTR;
+ break;
+
+ // Constant Values
+ case NODETYPE_STRING:
+ case NODETYPE_INTEGER:
+ case NODETYPE_REAL:
+ ret = &Node->Constant;
+ Object_Reference(ret);
+ break;
+
+ // --- Operations ---
+ // Boolean Operations
+ case NODETYPE_LOGICALNOT: // Logical NOT (!)
+ op1 = AST_ExecuteNode(Block, Node->UniOp.Value);
+ if(op1 == ERRPTR) return ERRPTR;
+ ret = SpiderScript_CreateInteger( !SpiderScript_IsValueTrue(op1) );
+ Object_Dereference(op1);
+ break;
+ case NODETYPE_LOGICALAND: // Logical AND (&&)
+ case NODETYPE_LOGICALOR: // Logical OR (||)
+ case NODETYPE_LOGICALXOR: // Logical XOR (^^)
+ op1 = AST_ExecuteNode(Block, Node->BinOp.Left);
+ if(op1 == ERRPTR) return ERRPTR;
+ op2 = AST_ExecuteNode(Block, Node->BinOp.Right);
+ if(op2 == ERRPTR) {
+ Object_Dereference(op1);
+ return ERRPTR;
+ }
+
+ switch( Node->Type )
+ {
+ case NODETYPE_LOGICALAND:
+ ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) && SpiderScript_IsValueTrue(op2) );
+ break;
+ case NODETYPE_LOGICALOR:
+ ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) || SpiderScript_IsValueTrue(op2) );
+ break;
+ case NODETYPE_LOGICALXOR:
+ ret = SpiderScript_CreateInteger( SpiderScript_IsValueTrue(op1) ^ SpiderScript_IsValueTrue(op2) );
+ break;
+ default: break;
+ }
+
+ // Free intermediate objects
+ Object_Dereference(op1);
+ Object_Dereference(op2);
+ break;
+
+ // Comparisons
+ case NODETYPE_EQUALS:
+ case NODETYPE_LESSTHAN:
+ case NODETYPE_GREATERTHAN:
+ case NODETYPE_LESSTHANEQUAL:
+ case NODETYPE_GREATERTHANEQUAL:
+ op1 = AST_ExecuteNode(Block, Node->BinOp.Left);
+ if(op1 == ERRPTR) return ERRPTR;
+ op2 = AST_ExecuteNode(Block, Node->BinOp.Right);
+ if(op2 == ERRPTR) {
+ Object_Dereference(op1);
+ ret = ERRPTR;
+ break;
+ }
+
+ if( !op1 || !op2 ) {
+ AST_RuntimeError(Node, "NULL Comparison (%p and %p)", op1, op2);
+ if(op1) Object_Dereference(op1);
+ if(op2) Object_Dereference(op2);
+ ret = SpiderScript_CreateInteger( !op1 && !op2 );
+ break;
+ }
+
+ // Convert types
+ if( op1->Type != op2->Type ) {
+ // If dynamically typed, convert op2 to op1's type
+ if(Block->Script->Variant->bImplicitCasts)
+ {
+ tmpobj = op2;
+ op2 = SpiderScript_CastValueTo(op1->Type, op2);
+ Object_Dereference(tmpobj);
+ if(op2 == ERRPTR) {
+ Object_Dereference(op1);
+ return ERRPTR;
+ }
+ }
+ // If statically typed, this should never happen, but catch it anyway
+ else {
+ AST_RuntimeError(Node, "Statically typed implicit cast %i <op> %i",
+ op1->Type, op2->Type);
+ ret = ERRPTR;
+ break;
+ }
+ }
+ // Do operation
+ switch(op1->Type)
+ {
+ // - String Compare (does a strcmp, well memcmp)
+ case SS_DATATYPE_STRING:
+ // Call memcmp to do most of the work
+ cmp = memcmp(
+ op1->String.Data, op2->String.Data,
+ (op1->String.Length < op2->String.Length) ? op1->String.Length : op2->String.Length
+ );
+ // Handle reaching the end of the string
+ if( cmp == 0 ) {
+ if( op1->String.Length == op2->String.Length )
+ cmp = 0;
+ else if( op1->String.Length < op2->String.Length )
+ cmp = 1;
+ else
+ cmp = -1;
+ }
+ break;
+
+ // - Integer Comparisons
+ case SS_DATATYPE_INTEGER:
+ if( op1->Integer == op2->Integer )
+ cmp = 0;
+ else if( op1->Integer < op2->Integer )
+ cmp = -1;
+ else
+ cmp = 1;
+ break;
+ // - Real Number Comparisons
+ case SS_DATATYPE_REAL:
+ cmp = (op1->Real - op2->Real) / op2->Real * 10000; // < 0.1% difference is equality
+ break;
+ default:
+ AST_RuntimeError(Node, "TODO - Comparison of type %i", op1->Type);
+ ret = ERRPTR;
+ break;
+ }
+
+ // Free intermediate objects
+ Object_Dereference(op1);
+ Object_Dereference(op2);
+
+ // Error check
+ if( ret == ERRPTR )
+ break;
+
+ // Create return
+ switch(Node->Type)
+ {
+ case NODETYPE_EQUALS: ret = SpiderScript_CreateInteger(cmp == 0); break;
+ case NODETYPE_LESSTHAN: ret = SpiderScript_CreateInteger(cmp < 0); break;
+ case NODETYPE_GREATERTHAN: ret = SpiderScript_CreateInteger(cmp > 0); break;
+ case NODETYPE_LESSTHANEQUAL: ret = SpiderScript_CreateInteger(cmp <= 0); break;
+ case NODETYPE_GREATERTHANEQUAL: ret = SpiderScript_CreateInteger(cmp >= 0); break;
+ default:
+ AST_RuntimeError(Node, "Exec,CmpOp unknown op %i", Node->Type);
+ ret = ERRPTR;
+ break;
+ }
+ break;
+
+ // General Unary Operations
+ case NODETYPE_BWNOT: // Bitwise NOT (~)
+ case NODETYPE_NEGATE: // Negation (-)
+ op1 = AST_ExecuteNode(Block, Node->UniOp.Value);
+ if(op1 == ERRPTR) return ERRPTR;
+ ret = AST_ExecuteNode_UniOp(Block, Node, Node->Type, op1);
+ Object_Dereference(op1);
+ break;
+
+ // General Binary Operations
+ case NODETYPE_ADD:
+ case NODETYPE_SUBTRACT:
+ case NODETYPE_MULTIPLY:
+ case NODETYPE_DIVIDE:
+ case NODETYPE_MODULO:
+ case NODETYPE_BWAND:
+ case NODETYPE_BWOR:
+ case NODETYPE_BWXOR:
+ case NODETYPE_BITSHIFTLEFT:
+ case NODETYPE_BITSHIFTRIGHT:
+ case NODETYPE_BITROTATELEFT:
+ // Get operands
+ op1 = AST_ExecuteNode(Block, Node->BinOp.Left);
+ if(op1 == ERRPTR) return ERRPTR;
+ op2 = AST_ExecuteNode(Block, Node->BinOp.Right);
+ if(op2 == ERRPTR) {
+ Object_Dereference(op1);
+ return ERRPTR;
+ }
+
+ ret = AST_ExecuteNode_BinOp(Block, Node, Node->Type, op1, op2);
+
+ // Free intermediate objects
+ Object_Dereference(op1);
+ Object_Dereference(op2);
+ break;
+
+ //default:
+ // ret = NULL;
+ // AST_RuntimeError(Node, "BUG - SpiderScript AST_ExecuteNode Unimplemented %i", Node->Type);
+ // break;
+ }
+_return:
+ // Reset namespace when no longer needed
+ if( Node->Type != NODETYPE_SCOPE )
+ Block->CurNamespace = NULL;
+
+ #if TRACE_NODE_RETURNS
+ if(ret && ret != ERRPTR) {
+ AST_RuntimeError(Node, "Ret type of %p %i is %i", Node, Node->Type, ret->Type);
+ }
+ else {
+ AST_RuntimeError(Node, "Ret type of %p %i is %p", Node, Node->Type, ret);
+ }
+ #endif
+
+ return ret;
+}
+
+tSpiderValue *AST_ExecuteNode_UniOp(tAST_BlockState *Block, tAST_Node *Node, int Operation, tSpiderValue *Value)
+{
+ tSpiderValue *ret;
+ #if 0
+ if( Value->Type == SS_DATATYPE_OBJECT )
+ {
+ const char *fcnname;
+ switch(Operation)
+ {
+ case NODETYPE_NEGATE: fcnname = "-ve"; break;
+ case NODETYPE_BWNOT: fcnname = "~"; break;
+ default: fcnname = NULL; break;
+ }
+
+ if( fcnname )
+ {
+ ret = Object_ExecuteMethod(Value->Object, fcnname, );
+ if( ret != ERRPTR )
+ return ret;
+ // Fall through and try casting (which will usually fail)
+ }
+ }
+ #endif
+ switch(Value->Type)
+ {
+ // Integer Operations
+ case SS_DATATYPE_INTEGER:
+ switch(Operation)
+ {
+ case NODETYPE_NEGATE: ret = SpiderScript_CreateInteger( -Value->Integer ); break;
+ case NODETYPE_BWNOT: ret = SpiderScript_CreateInteger( ~Value->Integer ); break;
+ default:
+ AST_RuntimeError(Node, "SpiderScript internal error: Exec,UniOP,Integer unknown op %i", Operation);
+ ret = ERRPTR;
+ break;
+ }
+ break;
+ // Real number Operations
+ case SS_DATATYPE_REAL:
+ switch(Operation)
+ {
+ case NODETYPE_NEGATE: ret = SpiderScript_CreateInteger( -Value->Real ); break;
+ default:
+ AST_RuntimeError(Node, "SpiderScript internal error: Exec,UniOP,Real unknown op %i", Operation);
+ ret = ERRPTR;
+ break;
+ }
+ break;
+
+ default:
+ AST_RuntimeError(NULL, "Invalid operation (%i) on type (%i)", Operation, Value->Type);
+ ret = ERRPTR;
+ break;
+ }
+
+ return ret;
+}
+
+tSpiderValue *AST_ExecuteNode_BinOp(tAST_BlockState *Block, tAST_Node *Node, int Operation, tSpiderValue *Left, tSpiderValue *Right)
+{
+ tSpiderValue *preCastValue = Right;
+ tSpiderValue *ret;
+
+ // Convert types
+ if( Left && Right && Left->Type != Right->Type )
+ {
+ #if 0
+ // Object types
+ // - Operator overload functions
+ if( Left->Type == SS_DATATYPE_OBJECT )
+ {
+ const char *fcnname;
+ switch(Operation)
+ {
+ case NODETYPE_ADD: fcnname = "+"; break;
+ case NODETYPE_SUBTRACT: fcnname = "-"; break;
+ case NODETYPE_MULTIPLY: fcnname = "*"; break;
+ case NODETYPE_DIVIDE: fcnname = "/"; break;
+ case NODETYPE_MODULO: fcnname = "%"; break;
+ case NODETYPE_BWAND: fcnname = "&"; break;
+ case NODETYPE_BWOR: fcnname = "|"; break;
+ case NODETYPE_BWXOR: fcnname = "^"; break;
+ case NODETYPE_BITSHIFTLEFT: fcnname = "<<"; break;
+ case NODETYPE_BITSHIFTRIGHT:fcnname = ">>"; break;
+ case NODETYPE_BITROTATELEFT:fcnname = "<<<"; break;
+ default: fcnname = NULL; break;
+ }
+
+ if( fcnname )
+ {
+ ret = Object_ExecuteMethod(Left->Object, fcnname, Right);
+ if( ret != ERRPTR )
+ return ret;
+ // Fall through and try casting (which will usually fail)
+ }
+ }
+ #endif
+
+ // If implicit casts are allowed, convert Right to Left's type
+ if(Block->Script->Variant->bImplicitCasts)
+ {
+ Right = SpiderScript_CastValueTo(Left->Type, Right);
+ if(Right == ERRPTR)
+ return ERRPTR;
+ }
+ // If statically typed, this should never happen, but catch it anyway
+ else {
+ AST_RuntimeError(Node, "Implicit cast not allowed (from %i to %i)", Right->Type, Left->Type);
+ return ERRPTR;
+ }
+ }
+
+ // NULL Check
+ if( Left == NULL || Right == NULL ) {
+ if(Right && Right != preCastValue) free(Right);
+ return NULL;
+ }
+
+ // Do operation
+ switch(Left->Type)
+ {
+ // String Concatenation
+ case SS_DATATYPE_STRING:
+ switch(Operation)
+ {
+ case NODETYPE_ADD: // Concatenate
+ ret = Object_StringConcat(Left, Right);
+ break;
+ default:
+ AST_RuntimeError(Node, "SpiderScript internal error: Exec,BinOP,String unknown op %i", Operation);
+ ret = ERRPTR;
+ break;
+ }
+ break;
+ // Integer Operations
+ case SS_DATATYPE_INTEGER:
+ switch(Operation)
+ {
+ case NODETYPE_ADD: ret = SpiderScript_CreateInteger( Left->Integer + Right->Integer ); break;
+ case NODETYPE_SUBTRACT: ret = SpiderScript_CreateInteger( Left->Integer - Right->Integer ); break;
+ case NODETYPE_MULTIPLY: ret = SpiderScript_CreateInteger( Left->Integer * Right->Integer ); break;
+ case NODETYPE_DIVIDE: ret = SpiderScript_CreateInteger( Left->Integer / Right->Integer ); break;
+ case NODETYPE_MODULO: ret = SpiderScript_CreateInteger( Left->Integer % Right->Integer ); break;
+ case NODETYPE_BWAND: ret = SpiderScript_CreateInteger( Left->Integer & Right->Integer ); break;
+ case NODETYPE_BWOR: ret = SpiderScript_CreateInteger( Left->Integer | Right->Integer ); break;
+ case NODETYPE_BWXOR: ret = SpiderScript_CreateInteger( Left->Integer ^ Right->Integer ); break;
+ case NODETYPE_BITSHIFTLEFT: ret = SpiderScript_CreateInteger( Left->Integer << Right->Integer ); break;
+ case NODETYPE_BITSHIFTRIGHT:ret = SpiderScript_CreateInteger( Left->Integer >> Right->Integer ); break;
+ case NODETYPE_BITROTATELEFT:
+ ret = SpiderScript_CreateInteger( (Left->Integer << Right->Integer) | (Left->Integer >> (64-Right->Integer)) );
+ break;
+ default:
+ AST_RuntimeError(Node, "SpiderScript internal error: Exec,BinOP,Integer unknown op %i", Operation);
+ ret = ERRPTR;
+ break;
+ }
+ break;
+
+ // Real Numbers
+ case SS_DATATYPE_REAL:
+ switch(Operation)
+ {
+ case NODETYPE_ADD: ret = SpiderScript_CreateReal( Left->Real + Right->Real ); break;
+ case NODETYPE_SUBTRACT: ret = SpiderScript_CreateReal( Left->Real - Right->Real ); break;
+ case NODETYPE_MULTIPLY: ret = SpiderScript_CreateReal( Left->Real * Right->Real ); break;
+ case NODETYPE_DIVIDE: ret = SpiderScript_CreateReal( Left->Real / Right->Real ); break;
+ default:
+ AST_RuntimeError(Node, "SpiderScript internal error: Exec,BinOP,Real unknown op %i", Operation);
+ ret = ERRPTR;
+ break;
+ }
+ break;
+
+ default:
+ AST_RuntimeError(Node, "BUG - Invalid operation (%i) on type (%i)", Operation, Left->Type);
+ ret = ERRPTR;
+ break;
+ }
+
+ if(Right && Right != preCastValue) free(Right);
+
+ return ret;
+}
+
+/**
+ * \brief Define a variable
+ * \param Block Current block state
+ * \param Type Type of the variable
+ * \param Name Name of the variable
+ * \return Boolean Failure
+ */
+tAST_Variable *Variable_Define(tAST_BlockState *Block, int Type, const char *Name, tSpiderValue *Value)
+{
+ tAST_Variable *var, *prev = NULL;
+
+ for( var = Block->FirstVar; var; prev = var, var = var->Next )
+ {
+ if( strcmp(var->Name, Name) == 0 ) {
+ AST_RuntimeError(NULL, "Redefinition of variable '%s'", Name);
+ return ERRPTR;
+ }
+ }
+
+ var = malloc( sizeof(tAST_Variable) + strlen(Name) + 1 );
+ var->Next = NULL;
+ var->Type = Type;
+ var->Object = Value;
+ if(Value) Object_Reference(Value);
+ strcpy(var->Name, Name);
+
+ if(prev) prev->Next = var;
+ else Block->FirstVar = var;
+
+ //printf("Defined variable %s (%i)\n", Name, Type);
+
+ return var;
+}
+
+tAST_Variable *Variable_Lookup(tAST_BlockState *Block, tAST_Node *VarNode, int CreateType)
+{
+ tAST_Variable *var = NULL;
+
+ // Speed hack
+ if( VarNode->BlockState == Block && VarNode->BlockIdent == Block->Ident ) {
+ var = VarNode->ValueCache;
+ #if TRACE_VAR_LOOKUPS
+ AST_RuntimeMessage(VarNode, "debug", "Fast var fetch on '%s' %p (%p:%i)",
+ VarNode->Variable.Name, var,
+ VarNode->BlockState, VarNode->BlockIdent
+ );
+ #endif
+ }
+ else
+ {
+ tAST_BlockState *bs;
+ for( bs = Block; bs; bs = bs->Parent )
+ {
+ for( var = bs->FirstVar; var; var = var->Next )
+ {
+ if( strcmp(var->Name, VarNode->Variable.Name) == 0 )
+ break;
+ }
+ if(var) break;
+ }
+
+ if( !var )
+ {
+ if( Block->Script->Variant->bDyamicTyped && CreateType != SS_DATATYPE_UNDEF ) {
+ // Define variable
+ var = Variable_Define(Block, CreateType, VarNode->Variable.Name, NULL);
+ }
+ else
+ {
+ AST_RuntimeError(VarNode, "Variable '%s' is undefined", VarNode->Variable.Name);
+ return NULL;
+ }
+ }
+
+ #if TRACE_VAR_LOOKUPS
+ AST_RuntimeMessage(VarNode, "debug", "Saved variable lookup of '%s' %p (%p:%i)",
+ VarNode->Variable.Name, var,
+ Block, Block->Ident);
+ #endif
+
+ VarNode->ValueCache = var;
+ VarNode->BlockState = Block;
+ VarNode->BlockIdent = Block->Ident;
+ }
+
+ return var;
+}
+
+/**
+ * \brief Set the value of a variable
+ * \return Boolean Failure
+ */
+int Variable_SetValue(tAST_BlockState *Block, tAST_Node *VarNode, tSpiderValue *Value)
+{
+ tAST_Variable *var;
+
+ var = Variable_Lookup(Block, VarNode, (Value ? Value->Type : SS_DATATYPE_UNDEF));
+
+ if( !var ) return -1;
+
+ if( !Block->Script->Variant->bDyamicTyped && (Value && var->Type != Value->Type) )
+ {
+ AST_RuntimeError(VarNode, "Type mismatch assigning to '%s'",
+ VarNode->Variable.Name);
+ return -2;
+ }
+
+// printf("Assign %p to '%s'\n", Value, var->Name);
+ Object_Reference(Value);
+ Object_Dereference(var->Object);
+ var->Object = Value;
+ return 0;
+}
+
+/**
+ * \brief Get the value of a variable
+ */
+tSpiderValue *Variable_GetValue(tAST_BlockState *Block, tAST_Node *VarNode)
+{
+ tAST_Variable *var = Variable_Lookup(Block, VarNode, 0);
+
+ if( !var ) return ERRPTR;
+
+ Object_Reference(var->Object);
+ return var->Object;
+}
+
+/**
+ * \brief Destorys a variable
+ */
+void Variable_Destroy(tAST_Variable *Variable)
+{
+// printf("Variable_Destroy: (%p'%s')\n", Variable, Variable->Name);
+ Object_Dereference(Variable->Object);
+ free(Variable);
+}
+
+void AST_RuntimeMessage(tAST_Node *Node, const char *Type, const char *Format, ...)
+{
+ va_list args;
+
+ if(Node) {
+ fprintf(stderr, "%s:%i: ", Node->File, Node->Line);
+ }
+ fprintf(stderr, "%s: ", Type);
+ va_start(args, Format);
+ vfprintf(stderr, Format, args);
+ va_end(args);
+ fprintf(stderr, "\n");
+}
+void AST_RuntimeError(tAST_Node *Node, const char *Format, ...)
+{
+ va_list args;
+
+ if(Node) {
+ fprintf(stderr, "%s:%i: ", Node->File, Node->Line);
+ }
+ fprintf(stderr, "error: ");
+ va_start(args, Format);
+ vfprintf(stderr, Format, args);
+ va_end(args);
+ fprintf(stderr, "\n");
+}