// Parse a cell
Cell* Parser::Parse_Cell(Cell* cell, bool topLevel)
{
// Parse the cells and check for errors along the way.
if (cell->IsPair())
{
// Parse the pair
if (cell->IsNull())
{
// Empty list
return cell;
}
else if (cell->Car()->GetType() & Cell::SymbolType)
{
const Sym* symbol = cell->Car()->GetSymbol();
if (symbol == Sym::Symbol("_quote"))
{
return Parse_Quote(cell);
}
else if (symbol == Sym::Symbol("_if"))
{
return Parse_If(cell);
}
else if (symbol == Sym::Symbol("_set!"))
{
return Parse_Set(cell);
}
else if (symbol == Sym::Symbol("_begin"))
{
return Parse_Begin(cell, topLevel);
}
else if (symbol == Sym::Symbol("_define"))
{
return Parse_Define(cell,topLevel);
}
else if (symbol == Sym::Symbol("_lambda"))
{
return Parse_Lambda(cell);
}
else if (symbol == Sym::Symbol("_quasiquote"))
{
THROW_ERROR_IF(cell->Length() != 2, cell, "Quasiquote does not take " << cell->Length() << " arguments");
return Parse_Quasiquote(cell->Cdr());
}
}
}
// Not a list, just return it.
return cell;
}
FUNCTION_PTR Parser::Parse_Function(void)
{
FUNCTION_PTR ptr = (FUNCTION_PTR)POV_MALLOC(sizeof(FUNCTION), "Function ID");
ExprNode *expression = NULL;
FunctionCode function;
Parse_Begin();
FNCode f(this, &function, false, NULL);
expression = FNSyntax_ParseExpression();
f.Compile(expression);
FNSyntax_DeleteExpression(expression);
Parse_End();
*ptr = sceneData->functionVM->AddFunction(&function);
return ptr;
}
FUNCTION_PTR Parser::Parse_DeclareFunction(int *token_id, const char *fn_name, bool is_local)
{
FUNCTION_PTR ptr = (FUNCTION_PTR)POV_MALLOC(sizeof(FUNCTION), "Function ID");
ExprNode *expression = NULL;
FunctionCode function;
// default type is float function
*token_id = FUNCT_ID_TOKEN;
FNCode f(this, &function, is_local, fn_name);
f.Parameter();
Parse_Begin();
Get_Token();
if(Token.Token_Id == INTERNAL_TOKEN)
{
GET(LEFT_PAREN_TOKEN);
Get_Token();
if(Token.Function_Id != FLOAT_TOKEN)
Expectation_Error("internal function identifier");
expression = FNSyntax_GetTrapExpression((unsigned int)(Token.Token_Float));
function.flags = FN_INLINE_FLAG;
GET(RIGHT_PAREN_TOKEN);
}
else if(Token.Token_Id == TRANSFORM_TOKEN)
{
if(function.parameter_cnt != 0)
Error("Function parameters for transform functions are not allowed.");
expression = FNSyntax_GetTrapExpression(1); // 1 refers to POVFPU_TrapSTable[1] = f_transform [trf]
function.private_copy_method = (FNCODE_PRIVATE_COPY_METHOD)Copy_Transform;
function.private_destroy_method = (FNCODE_PRIVATE_DESTROY_METHOD)Destroy_Transform;
function.private_data = reinterpret_cast<void *>(Parse_Transform_Block());
function.return_size = 3; // returns a 3d vector!!!
// function type is vector function
*token_id = VECTFUNCT_ID_TOKEN;
}
else if(Token.Token_Id == SPLINE_TOKEN)
{
if(function.parameter_cnt != 0)
Error("Function parameters for spline functions are not allowed.");
Experimental_Flag |= EF_SPLINE;
expression = FNSyntax_GetTrapExpression(2); // 2 refers to POVFPU_TrapSTable[2] = f_spline [trf]
function.private_copy_method = (FNCODE_PRIVATE_COPY_METHOD)Copy_Spline;
function.private_destroy_method = (FNCODE_PRIVATE_DESTROY_METHOD)Destroy_Spline;
Parse_Begin();
function.private_data = reinterpret_cast<void *>(Parse_Spline());
Parse_End();
function.return_size = (reinterpret_cast<SPLINE *>(function.private_data))->Terms; // returns a 2d, 3d, 4d or 5d vector!!!
// function type is vector function
*token_id = VECTFUNCT_ID_TOKEN;
}
else if(Token.Token_Id == PIGMENT_TOKEN)
{
if(function.parameter_cnt != 0)
Error("Function parameters for pigment functions are not allowed.");
expression = FNSyntax_GetTrapExpression(0); // 0 refers to POVFPU_TrapSTable[0] = f_pigment [trf]
function.private_copy_method = (FNCODE_PRIVATE_COPY_METHOD)Copy_Pigment;
function.private_destroy_method = (FNCODE_PRIVATE_DESTROY_METHOD)Destroy_Pigment;
Parse_Begin();
function.private_data = reinterpret_cast<void *>(Create_Pigment());
Parse_Pigment(reinterpret_cast<PIGMENT **>(&function.private_data));
Parse_End();
Post_Pigment(reinterpret_cast<PIGMENT *>(function.private_data));
function.return_size = 5; // returns a color!!!
// function type is vector function
*token_id = VECTFUNCT_ID_TOKEN;
}
else if(Token.Token_Id == PATTERN_TOKEN)
{
if(function.parameter_cnt != 0)
Error("Function parameters for pattern functions are not allowed.");
expression = FNSyntax_GetTrapExpression(77); // 77 refers to POVFPU_TrapTable[77] = f_pattern [trf]
function.private_copy_method = (FNCODE_PRIVATE_COPY_METHOD)Copy_Pigment;
function.private_destroy_method = (FNCODE_PRIVATE_DESTROY_METHOD)Destroy_Pigment;
Parse_Begin();
function.private_data = reinterpret_cast<void *>(Create_Pigment()); // Yes, this is a pigment! [trf]
Parse_PatternFunction(reinterpret_cast<TPATTERN *>(function.private_data));
Parse_End();
Post_Pigment(reinterpret_cast<PIGMENT *>(function.private_data));
}
else if(Token.Token_Id == STRING_LITERAL_TOKEN)
{
f.SetFlag(2, Token.Token_String);
Get_Token();
if(Token.Token_Id == COMMA_TOKEN)
{
Get_Token();
if(Token.Token_Id != STRING_LITERAL_TOKEN)
Expectation_Error("valid function expression");
f.SetFlag(1, Token.Token_String);
}
else
{
Unget_Token();
expression = FNSyntax_ParseExpression();
}
}
else
{
Unget_Token();
expression = FNSyntax_ParseExpression();
}
f.Compile(expression);
FNSyntax_DeleteExpression(expression);
Parse_End();
*ptr = sceneData->functionVM->AddFunction(&function);
return ptr;
}